/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.119 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 1.119 2006/02/05 02:25:58 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 1.119 2006/02/05 02:25:58 solar Exp $";
13#define argv0 "scanelf"
14
15#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17
18 16
19/* prototypes */ 17/* prototypes */
20static int scanelf_elfobj(elfobj *elf); 18static int file_matches_list(const char *filename, char **matchlist);
21static int scanelf_elf(const char *filename, int fd, size_t len);
22static int scanelf_archive(const char *filename, int fd, size_t len);
23static void scanelf_file(const char *filename);
24static void scanelf_dir(const char *path);
25static void scanelf_ldpath(void);
26static void scanelf_envpath(void);
27static void usage(int status);
28static void parseargs(int argc, char *argv[]);
29static char *xstrdup(const char *s);
30static void *xmalloc(size_t size);
31static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
33static inline void xchrcat(char **dst, const char append, size_t *curr_len);
34 19
35/* variables to control behavior */ 20/* variables to control behavior */
36static char match_etypes[126] = ""; 21static char *match_etypes = NULL;
37static char *ldpaths[256]; 22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
38static char scan_ldpath = 0; 23static char scan_ldpath = 0;
39static char scan_envpath = 0; 24static char scan_envpath = 0;
40static char scan_symlink = 1; 25static char scan_symlink = 1;
41static char scan_archives = 0; 26static char scan_archives = 0;
42static char dir_recurse = 0; 27static char dir_recurse = 0;
43static char dir_crossmount = 1; 28static char dir_crossmount = 1;
44static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
45static char show_phdr = 0; 32static char show_phdr = 0;
46static char show_textrel = 0; 33static char show_textrel = 0;
47static char show_rpath = 0; 34static char show_rpath = 0;
48static char show_needed = 0; 35static char show_needed = 0;
49static char show_interp = 0; 36static char show_interp = 0;
50static char show_bind = 0; 37static char show_bind = 0;
51static char show_soname = 0; 38static char show_soname = 0;
52static char show_textrels = 0; 39static char show_textrels = 0;
53static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
54static char be_quiet = 0; 44static char be_quiet = 0;
55static char be_verbose = 0; 45static char be_verbose = 0;
56static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
57static char *find_sym = NULL, *versioned_symname = NULL; 47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
49static array_t _find_sym_arr = array_init_decl, *find_sym_arr = &_find_sym_arr;
50static array_t _find_sym_regex_arr = array_init_decl, *find_sym_regex_arr = &_find_sym_regex_arr;
58static char *find_lib = NULL; 51static char *find_lib = NULL;
52static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
53static char *find_section = NULL;
54static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
59static char *out_format = NULL; 55static char *out_format = NULL;
60static char *search_path = NULL; 56static char *search_path = NULL;
61static char fix_elf = 0; 57static char fix_elf = 0;
62static char gmatch = 0; 58static char g_match = 0;
63static char use_ldcache = 0; 59static char use_ldcache = 0;
60static char use_ldpath = 0;
64 61
62static char **qa_textrels = NULL;
63static char **qa_execstack = NULL;
64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
65 66
66caddr_t ldcache = 0; 67static int match_bits = 0;
68static unsigned int match_perms = 0;
69static void *ldcache = NULL;
67size_t ldcache_size = 0; 70static size_t ldcache_size = 0;
71static unsigned long setpax = 0UL;
68 72
73static int has_objdump = 0;
74
75/* find the path to a file by name */
76static int bin_in_path(const char *fname)
77{
78 char fullpath[__PAX_UTILS_PATH_MAX];
79 char *path, *p;
80
81 path = getenv("PATH");
82 if (!path)
83 return 0;
84
85 while ((p = strrchr(path, ':')) != NULL) {
86 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
87 *p = 0;
88 if (access(fullpath, R_OK) != -1)
89 return 1;
90 }
91
92 return 0;
93}
94
95static FILE *fopenat_r(int dir_fd, const char *path)
96{
97 int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
98 if (fd == -1)
99 return NULL;
100 return fdopen(fd, "re");
101}
102
103static const char *root_rel_path(const char *path)
104{
105 /*
106 * openat() will ignore the dirfd if path starts with
107 * a /, so consume all of that noise
108 *
109 * XXX: we don't handle relative paths like ../ that
110 * break out of the --root option, but for now, just
111 * don't do that :P.
112 */
113 if (root_fd != AT_FDCWD) {
114 while (*path == '/')
115 ++path;
116 if (*path == '\0')
117 path = ".";
118 }
119
120 return path;
121}
122
69/* sub-funcs for scanelf_file() */ 123/* sub-funcs for scanelf_fileat() */
70static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 124static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
71{ 125{
72 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 126 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
127
128 /* debug sections */
129 void *symtab = elf_findsecbyname(elf, ".symtab");
130 void *strtab = elf_findsecbyname(elf, ".strtab");
131 /* runtime sections */
132 void *dynsym = elf_findsecbyname(elf, ".dynsym");
133 void *dynstr = elf_findsecbyname(elf, ".dynstr");
134
135 /*
136 * If the sections are marked NOBITS, then they don't exist, so we just
137 * skip them. This let's us work sanely with splitdebug ELFs (rather
138 * than spewing a lot of "corrupt ELF" messages later on). In malformed
139 * ELFs, the section might be wrongly set to NOBITS, but screw em.
140 */
73#define GET_SYMTABS(B) \ 141#define GET_SYMTABS(B) \
74 if (elf->elf_class == ELFCLASS ## B) { \ 142 if (elf->elf_class == ELFCLASS ## B) { \
75 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 143 Elf ## B ## _Shdr *esymtab = symtab; \
76 /* debug sections */ \ 144 Elf ## B ## _Shdr *estrtab = strtab; \
77 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 145 Elf ## B ## _Shdr *edynsym = dynsym; \
78 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 146 Elf ## B ## _Shdr *edynstr = dynstr; \
79 /* runtime sections */ \ 147 \
80 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 148 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
81 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 149 symtab = NULL; \
150 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
151 dynsym = NULL; \
82 if (symtab && dynsym) { \ 152 if (symtab && dynsym) \
83 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 153 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
84 } else { \ 154 else \
85 *sym = (void*)(symtab ? symtab : dynsym); \ 155 *sym = symtab ? symtab : dynsym; \
86 } \ 156 \
157 if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
158 strtab = NULL; \
159 if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
160 dynstr = NULL; \
87 if (strtab && dynstr) { \ 161 if (strtab && dynstr) \
88 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 162 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
89 } else { \ 163 else \
90 *tab = (void*)(strtab ? strtab : dynstr); \ 164 *str = strtab ? strtab : dynstr; \
91 } \
92 } 165 }
93 GET_SYMTABS(32) 166 GET_SYMTABS(32)
94 GET_SYMTABS(64) 167 GET_SYMTABS(64)
168
169 if (*sym && *str)
170 return;
171
172 /*
173 * damn, they're really going to make us work for it huh?
174 * reconstruct the section header info out of the dynamic
175 * tags so we can see what symbols this guy uses at runtime.
176 */
177#define GET_SYMTABS_DT(B) \
178 if (elf->elf_class == ELFCLASS ## B) { \
179 size_t i; \
180 static Elf ## B ## _Shdr sym_shdr, str_shdr; \
181 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
182 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
183 Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
184 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Off offset; \
186 \
187 /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
188 vsym = vstr = vhash = vgnu_hash = 0; \
189 memset(&sym_shdr, 0, sizeof(sym_shdr)); \
190 memset(&str_shdr, 0, sizeof(str_shdr)); \
191 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
192 if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
193 continue; \
194 \
195 offset = EGET(phdr[i].p_offset); \
196 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
197 continue; \
198 \
199 dyn = DYN ## B (elf->vdata + offset); \
200 while (EGET(dyn->d_tag) != DT_NULL) { \
201 switch (EGET(dyn->d_tag)) { \
202 case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
203 case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
204 case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
205 case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
206 case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
207 /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
208 } \
209 ++dyn; \
210 } \
211 if (vsym && vstr) \
212 break; \
213 } \
214 if (!vsym || !vstr || !(vhash || vgnu_hash)) \
215 return; \
216 \
217 /* calc offset into the ELF by finding the load addr of the syms */ \
218 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
219 Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
220 Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
221 offset = EGET(phdr[i].p_offset); \
222 \
223 if (EGET(phdr[i].p_type) != PT_LOAD) \
224 continue; \
225 \
226 if (vhash >= vaddr && vhash < vaddr + filesz) { \
227 /* Scan the hash table to see how many entries we have */ \
228 Elf32_Word max_sym_idx = 0; \
229 Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
230 Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
231 Elf32_Word nchains = EGET(hashtbl[1]); \
232 Elf32_Word *buckets = &hashtbl[2]; \
233 Elf32_Word *chains = &buckets[nbuckets]; \
234 Elf32_Word sym_idx; \
235 \
236 for (b = 0; b < nbuckets; ++b) { \
237 if (!buckets[b]) \
238 continue; \
239 for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
240 if (max_sym_idx < sym_idx) \
241 max_sym_idx = sym_idx; \
242 } \
243 ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
244 } \
245 \
246 if (vsym >= vaddr && vsym < vaddr + filesz) { \
247 ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
248 *sym = &sym_shdr; \
249 } \
250 \
251 if (vstr >= vaddr && vstr < vaddr + filesz) { \
252 ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
253 *str = &str_shdr; \
254 } \
255 } \
256 }
257 GET_SYMTABS_DT(32)
258 GET_SYMTABS_DT(64)
95} 259}
260
96static char *scanelf_file_pax(elfobj *elf, char *found_pax) 261static char *scanelf_file_pax(elfobj *elf, char *found_pax)
97{ 262{
98 static char ret[7]; 263 static char ret[7];
99 unsigned long i, shown; 264 unsigned long i, shown;
100 265
109 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 274 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
110 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 275 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 276 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
112 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 277 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
113 continue; \ 278 continue; \
114 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 279 if (fix_elf && setpax) { \
280 /* set the paxctl flags */ \
281 ESET(phdr[i].p_flags, setpax); \
282 } \
283 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
115 continue; \ 284 continue; \
116 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 285 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
117 *found_pax = 1; \ 286 *found_pax = 1; \
118 ++shown; \ 287 ++shown; \
119 break; \ 288 break; \
120 } \ 289 } \
121 } 290 }
122 SHOW_PAX(32) 291 SHOW_PAX(32)
123 SHOW_PAX(64) 292 SHOW_PAX(64)
124 } 293 }
294
295 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
296 * was found. This is known to break ELFs on glibc systems,
297 * and mainline PaX has deprecated use of this for a long time.
298 * We could support changing PT_GNU_STACK, but that doesn't
299 * seem like it's worth the effort. #411919
300 */
125 301
126 /* fall back to EI_PAX if no PT_PAX was found */ 302 /* fall back to EI_PAX if no PT_PAX was found */
127 if (!*ret) { 303 if (!*ret) {
128 static char *paxflags; 304 static char *paxflags;
129 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 305 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
143static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 319static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
144{ 320{
145 static char ret[12]; 321 static char ret[12];
146 char *found; 322 char *found;
147 unsigned long i, shown, multi_stack, multi_relro, multi_load; 323 unsigned long i, shown, multi_stack, multi_relro, multi_load;
148 int max_pt_load;
149 324
150 if (!show_phdr) return NULL; 325 if (!show_phdr) return NULL;
151 326
152 memcpy(ret, "--- --- ---\0", 12); 327 memcpy(ret, "--- --- ---\0", 12);
153 328
154 shown = 0; 329 shown = 0;
155 multi_stack = multi_relro = multi_load = 0; 330 multi_stack = multi_relro = multi_load = 0;
156 max_pt_load = elf_max_pt_load(elf);
157 331
158#define NOTE_GNU_STACK ".note.GNU-stack" 332#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 333#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 334 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 335 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
163 uint32_t flags, check_flags; \ 337 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \ 338 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 339 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 341 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
342 if (multi_stack++) \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 343 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
344 if (file_matches_list(elf->filename, qa_execstack)) \
345 continue; \
169 found = found_phdr; \ 346 found = found_phdr; \
170 offset = 0; \ 347 offset = 0; \
171 check_flags = PF_X; \ 348 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 349 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
350 if (multi_relro++) \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 351 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \ 352 found = found_relro; \
175 offset = 4; \ 353 offset = 4; \
176 check_flags = PF_X; \ 354 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 355 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \ 356 if (file_matches_list(elf->filename, qa_wx_load)) \
179 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \ 357 continue; \
180 found = found_load; \ 358 found = found_load; \
181 offset = 8; \ 359 offset = 8; \
182 check_flags = PF_W|PF_X; \ 360 check_flags = PF_W|PF_X; \
183 } else \ 361 } else \
184 continue; \ 362 continue; \
185 flags = EGET(phdr[i].p_flags); \ 363 flags = EGET(phdr[i].p_flags); \
186 if (be_quiet && ((flags & check_flags) != check_flags)) \ 364 if (be_quiet && ((flags & check_flags) != check_flags)) \
187 continue; \ 365 continue; \
188 if (fix_elf && ((flags & PF_X) != flags)) { \ 366 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
189 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \ 367 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
190 ret[3] = ret[7] = '!'; \ 368 ret[3] = ret[7] = '!'; \
191 flags = EGET(phdr[i].p_flags); \ 369 flags = EGET(phdr[i].p_flags); \
192 } \ 370 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 371 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
197 } else if (elf->shdr != NULL) { \ 375 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 376 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 377 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 378 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 char *str; \ 379 char *str; \
202 if ((void*)strtbl > (void*)elf->data_end) \ 380 if ((void*)strtbl > elf->data_end) \
203 goto skip_this_shdr##B; \ 381 goto skip_this_shdr##B; \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 382 check_flags = SHF_WRITE|SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 383 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 384 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 385 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
221 break; \ 399 break; \
222 } \ 400 } \
223 } \ 401 } \
224 skip_this_shdr##B: \ 402 skip_this_shdr##B: \
225 if (!multi_stack) { \ 403 if (!multi_stack) { \
404 if (file_matches_list(elf->filename, qa_execstack)) \
405 return NULL; \
226 *found_phdr = 1; \ 406 *found_phdr = 1; \
227 shown = 1; \ 407 shown = 1; \
228 memcpy(ret, "!WX", 3); \ 408 memcpy(ret, "!WX", 3); \
229 } \ 409 } \
230 } \ 410 } \
235 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 415 if (be_wewy_wewy_quiet || (be_quiet && !shown))
236 return NULL; 416 return NULL;
237 else 417 else
238 return ret; 418 return ret;
239} 419}
420
421/*
422 * See if this ELF contains a DT_TEXTREL tag in any of its
423 * PT_DYNAMIC sections.
424 */
240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 425static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
241{ 426{
242 static const char *ret = "TEXTREL"; 427 static const char *ret = "TEXTREL";
243 unsigned long i; 428 unsigned long i;
244 429
245 if (!show_textrel && !show_textrels) return NULL; 430 if (!show_textrel && !show_textrels) return NULL;
431
432 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
246 433
247 if (elf->phdr) { 434 if (elf->phdr) {
248#define SHOW_TEXTREL(B) \ 435#define SHOW_TEXTREL(B) \
249 if (elf->elf_class == ELFCLASS ## B) { \ 436 if (elf->elf_class == ELFCLASS ## B) { \
250 Elf ## B ## _Dyn *dyn; \ 437 Elf ## B ## _Dyn *dyn; \
251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 438 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 439 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
253 Elf ## B ## _Off offset; \ 440 Elf ## B ## _Off offset; \
254 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 441 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
255 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 442 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
256 offset = EGET(phdr[i].p_offset); \ 443 offset = EGET(phdr[i].p_offset); \
257 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 444 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
258 dyn = DYN ## B (elf->data + offset); \ 445 dyn = DYN ## B (elf->vdata + offset); \
259 while (EGET(dyn->d_tag) != DT_NULL) { \ 446 while (EGET(dyn->d_tag) != DT_NULL) { \
260 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 447 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
261 *found_textrel = 1; \ 448 *found_textrel = 1; \
262 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 449 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
263 return (be_wewy_wewy_quiet ? NULL : ret); \ 450 return (be_wewy_wewy_quiet ? NULL : ret); \
272 if (be_quiet || be_wewy_wewy_quiet) 459 if (be_quiet || be_wewy_wewy_quiet)
273 return NULL; 460 return NULL;
274 else 461 else
275 return " - "; 462 return " - ";
276} 463}
464
465/*
466 * Scan the .text section to see if there are any relocations in it.
467 * Should rewrite this to check PT_LOAD sections that are marked
468 * Executable rather than the section named '.text'.
469 */
277static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 470static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
278{ 471{
279 unsigned long s, r, rmax; 472 unsigned long s, r, rmax;
280 void *symtab_void, *strtab_void, *text_void; 473 void *symtab_void, *strtab_void, *text_void;
281 474
302 Elf ## B ## _Rela *rela; \ 495 Elf ## B ## _Rela *rela; \
303 /* search the section headers for relocations */ \ 496 /* search the section headers for relocations */ \
304 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 497 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
305 uint32_t sh_type = EGET(shdr[s].sh_type); \ 498 uint32_t sh_type = EGET(shdr[s].sh_type); \
306 if (sh_type == SHT_REL) { \ 499 if (sh_type == SHT_REL) { \
307 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 500 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
308 rela = NULL; \ 501 rela = NULL; \
309 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 502 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
310 } else if (sh_type == SHT_RELA) { \ 503 } else if (sh_type == SHT_RELA) { \
311 rel = NULL; \ 504 rel = NULL; \
312 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 505 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
313 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 506 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
314 } else \ 507 } else \
315 continue; \ 508 continue; \
316 /* now see if any of the relocs are in the .text */ \ 509 /* now see if any of the relocs are in the .text */ \
317 for (r = 0; r < rmax; ++r) { \ 510 for (r = 0; r < rmax; ++r) { \
332 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 525 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
333 if (be_verbose <= 2) continue; \ 526 if (be_verbose <= 2) continue; \
334 } else \ 527 } else \
335 *found_textrels = 1; \ 528 *found_textrels = 1; \
336 /* locate this relocation symbol name */ \ 529 /* locate this relocation symbol name */ \
337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 530 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \ 531 if ((void*)sym > elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \ 532 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \ 533 continue; \
341 } \ 534 } \
342 sym_max = ELF ## B ## _R_SYM(r_info); \ 535 sym_max = ELF ## B ## _R_SYM(r_info); \
343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 536 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
346 sym = NULL; \ 539 sym = NULL; \
347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 540 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
348 /* show the raw details about this reloc */ \ 541 /* show the raw details about this reloc */ \
349 printf(" %s: ", elf->base_filename); \ 542 printf(" %s: ", elf->base_filename); \
350 if (sym && sym->st_name) \ 543 if (sym && sym->st_name) \
351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 544 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
352 else \ 545 else \
353 printf("(memory/fake?)"); \ 546 printf("(memory/data?)"); \
354 printf(" [0x%lX]", (unsigned long)r_offset); \ 547 printf(" [0x%lX]", (unsigned long)r_offset); \
355 /* now try to find the closest symbol that this rel is probably in */ \ 548 /* now try to find the closest symbol that this rel is probably in */ \
356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 549 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
357 func = NULL; \ 550 func = NULL; \
358 offset_tmp = 0; \ 551 offset_tmp = 0; \
359 while (sym_max--) { \ 552 while (sym_max--) { \
360 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 553 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
361 func = sym; \ 554 func = sym; \
362 offset_tmp = EGET(sym->st_value); \ 555 offset_tmp = EGET(sym->st_value); \
363 } \ 556 } \
364 ++sym; \ 557 ++sym; \
365 } \ 558 } \
366 printf(" in "); \ 559 printf(" in "); \
367 if (func && func->st_name) \ 560 if (func && func->st_name) { \
368 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 561 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
562 if (r_offset > EGET(func->st_size)) \
563 printf("(optimized out: previous %s)", func_name); \
369 else \ 564 else \
370 printf("(NULL: fake?)"); \ 565 printf("%s", func_name); \
566 } else \
567 printf("(optimized out)"); \
371 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 568 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
569 if (be_verbose && has_objdump) { \
570 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
571 char *sysbuf; \
572 size_t syslen; \
573 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
574 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
575 sysbuf = xmalloc(syslen); \
576 if (end_addr < r_offset) \
577 /* not uncommon when things are optimized out */ \
578 end_addr = r_offset + 0x100; \
579 snprintf(sysbuf, syslen, sysfmt, \
580 (unsigned long)offset_tmp, \
581 (unsigned long)end_addr, \
582 elf->filename, \
583 (unsigned long)r_offset); \
584 fflush(stdout); \
585 if (system(sysbuf)) {/* don't care */} \
586 fflush(stdout); \
587 free(sysbuf); \
588 } \
372 } \ 589 } \
373 } } 590 } }
374 SHOW_TEXTRELS(32) 591 SHOW_TEXTRELS(32)
375 SHOW_TEXTRELS(64) 592 SHOW_TEXTRELS(64)
376 } 593 }
378 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 595 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
379 596
380 return NULL; 597 return NULL;
381} 598}
382 599
383static void rpath_security_checks(elfobj *, char *, const char *);
384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 600static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{ 601{
386 struct stat st; 602 struct stat st;
387 switch (*item) { 603 switch (*item) {
388 case '/': break; 604 case '/': break;
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 610 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break; 611 break;
396 case '$': 612 case '$':
397 if (fstat(elf->fd, &st) != -1) 613 if (fstat(elf->fd, &st) != -1)
398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 614 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
399 warnf("Security problem with %s='%s' in %s with mode set of %o", 615 warnf("Security problem with %s='%s' in %s with mode set of %o",
400 dt_type, item, elf->filename, st.st_mode & 07777); 616 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
401 break; 617 break;
402 default: 618 default:
403 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename); 619 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
404 break; 620 break;
405 } 621 }
406} 622}
407static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 623static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
408{ 624{
409 unsigned long i, s; 625 unsigned long i;
410 char *rpath, *runpath, **r; 626 char *rpath, *runpath, **r;
411 void *strtbl_void; 627 void *strtbl_void;
412 628
413 if (!show_rpath) return; 629 if (!show_rpath) return;
414 630
425 Elf ## B ## _Off offset; \ 641 Elf ## B ## _Off offset; \
426 Elf ## B ## _Xword word; \ 642 Elf ## B ## _Xword word; \
427 /* Scan all the program headers */ \ 643 /* Scan all the program headers */ \
428 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 644 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
429 /* Just scan dynamic headers */ \ 645 /* Just scan dynamic headers */ \
430 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 646 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
431 offset = EGET(phdr[i].p_offset); \ 647 offset = EGET(phdr[i].p_offset); \
432 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
433 /* Just scan dynamic RPATH/RUNPATH headers */ \ 649 /* Just scan dynamic RPATH/RUNPATH headers */ \
434 dyn = DYN ## B (elf->data + offset); \ 650 dyn = DYN ## B (elf->vdata + offset); \
435 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 651 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
436 if (word == DT_RPATH) { \ 652 if (word == DT_RPATH) { \
437 r = &rpath; \ 653 r = &rpath; \
438 } else if (word == DT_RUNPATH) { \ 654 } else if (word == DT_RUNPATH) { \
439 r = &runpath; \ 655 r = &runpath; \
443 } \ 659 } \
444 /* Verify the memory is somewhat sane */ \ 660 /* Verify the memory is somewhat sane */ \
445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 661 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
446 if (offset < (Elf ## B ## _Off)elf->len) { \ 662 if (offset < (Elf ## B ## _Off)elf->len) { \
447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 663 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
448 *r = (char*)(elf->data + offset); \ 664 *r = elf->data + offset; \
449 /* cache the length in case we need to nuke this section later on */ \ 665 /* cache the length in case we need to nuke this section later on */ \
450 if (fix_elf) \ 666 if (fix_elf) \
451 offset = strlen(*r); \ 667 offset = strlen(*r); \
452 /* If quiet, don't output paths in ld.so.conf */ \ 668 /* If quiet, don't output paths in ld.so.conf */ \
453 if (be_quiet) { \ 669 if (be_quiet) { \
459 /* scan each path in : delimited list */ \ 675 /* scan each path in : delimited list */ \
460 while (start) { \ 676 while (start) { \
461 rpath_security_checks(elf, start, get_elfdtype(word)); \ 677 rpath_security_checks(elf, start, get_elfdtype(word)); \
462 end = strchr(start, ':'); \ 678 end = strchr(start, ':'); \
463 len = (end ? abs(end - start) : strlen(start)); \ 679 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \ 680 if (use_ldcache) { \
465 for (s = 0; ldpaths[s]; ++s) \ 681 size_t n; \
682 const char *ldpath; \
683 array_for_each(ldpaths, n, ldpath) \
466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 684 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
467 *r = end; \ 685 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \ 686 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \ 687 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \ 688 if (end && end[1] != '\0') \
471 (*r)++; \ 689 (*r)++; \
472 break; \ 690 break; \
473 } \ 691 } \
692 } \
474 if (!*r || !end) \ 693 if (!*r || !end) \
475 break; \ 694 break; \
476 else \ 695 else \
477 start = start + len + 1; \ 696 start = start + len + 1; \
478 } \ 697 } \
544 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 763 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
545 else if (!be_quiet) 764 else if (!be_quiet)
546 xstrcat(ret, " - ", ret_len); 765 xstrcat(ret, " - ", ret_len);
547} 766}
548 767
768/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
549#define LDSO_CACHE_MAGIC "ld.so-" 769#define LDSO_CACHE_MAGIC "ld.so-"
550#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 770#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
551#define LDSO_CACHE_VER "1.7.0" 771#define LDSO_CACHE_VER "1.7.0"
552#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 772#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
553#define FLAG_ANY -1 773#define FLAG_ANY -1
562#define FLAG_X8664_LIB64 0x0300 782#define FLAG_X8664_LIB64 0x0300
563#define FLAG_S390_LIB64 0x0400 783#define FLAG_S390_LIB64 0x0400
564#define FLAG_POWERPC_LIB64 0x0500 784#define FLAG_POWERPC_LIB64 0x0500
565#define FLAG_MIPS64_LIBN32 0x0600 785#define FLAG_MIPS64_LIBN32 0x0600
566#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
567 790
568static char *lookup_cache_lib(elfobj *, char *); 791#if defined(__GLIBC__) || defined(__UCLIBC__)
792
569static char *lookup_cache_lib(elfobj *elf, char *fname) 793static char *lookup_cache_lib(elfobj *elf, const char *fname)
570{ 794{
571 int fd = 0; 795 int fd;
572 char *strs; 796 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = ""; 797 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache"; 798 const char *cachefile = root_rel_path("/etc/ld.so.cache");
575 struct stat st; 799 struct stat st;
576 800
577 typedef struct { 801 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN]; 802 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN]; 803 char version[LDSO_CACHE_VER_LEN];
589 libentry_t *libent; 813 libentry_t *libent;
590 814
591 if (fname == NULL) 815 if (fname == NULL)
592 return NULL; 816 return NULL;
593 817
594 if (ldcache == 0) { 818 if (ldcache == NULL) {
595 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)
596 return NULL; 824 return NULL;
597 825
598 /* 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 */
599 ldcache_size = st.st_size; 827 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 828 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd); 829 close(fd);
603 830
604 if (ldcache == (caddr_t)-1) { 831 if (ldcache == MAP_FAILED) {
605 ldcache = 0; 832 ldcache = NULL;
606 return NULL; 833 return NULL;
607 } 834 }
608 835
609 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;
610 return NULL; 841 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 } 842 }
843 } else
844 header = ldcache;
614 845
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t)); 846 libent = ldcache + sizeof(header_t);
617 strs = (char *) &libent[header->nlibs]; 847 strs = (char *) &libent[header->nlibs];
618 848
619 for (fd = 0; fd < header->nlibs; fd++) { 849 for (fd = 0; fd < header->nlibs; ++fd) {
620 /* 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
621 * diff arches will not be cached together. and we ignore the 851 * diff arches will not be cached together, and we ignore the
622 * the different multilib mips cases. */ 852 * the different multilib mips cases.
853 */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 854 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue; 855 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 856 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue; 857 continue;
627 858
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 859 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue; 860 continue;
861
862 /* Return first hit because that is how the ldso rolls */
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 863 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
864 break;
631 } 865 }
866
632 return buf; 867 return buf;
633} 868}
634 869
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}
635 920
636static 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)
637{ 922{
638 unsigned long i; 923 unsigned long i;
639 char *needed; 924 char *needed;
640 void *strtbl_void; 925 void *strtbl_void;
641 char *p; 926 char *p;
642 927
928 /*
929 * -n -> op==0 -> print all
930 * -N -> op==1 -> print requested
931 */
643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 932 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
933 return NULL;
644 934
645 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 935 strtbl_void = elf_findsecbyname(elf, ".dynstr");
646 936
647 if (elf->phdr && strtbl_void) { 937 if (elf->phdr && strtbl_void) {
648#define SHOW_NEEDED(B) \ 938#define SHOW_NEEDED(B) \
650 Elf ## B ## _Dyn *dyn; \ 940 Elf ## B ## _Dyn *dyn; \
651 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 941 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
652 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 942 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
653 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 943 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
654 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 */ \
655 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 947 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
656 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; \
657 offset = EGET(phdr[i].p_offset); \ 950 offset = EGET(phdr[i].p_offset); \
658 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 */ \
659 dyn = DYN ## B (elf->data + offset); \ 954 dyn = DYN ## B (elf->vdata + offset); \
660 while (EGET(dyn->d_tag) != DT_NULL) { \ 955 while (EGET(dyn->d_tag) != DT_NULL) { \
661 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 956 if (EGET(dyn->d_tag) == DT_NEEDED) { \
662 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 957 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
663 if (offset >= (Elf ## B ## _Off)elf->len) { \ 958 if (offset >= (Elf ## B ## _Off)elf->len) { \
664 ++dyn; \ 959 ++dyn; \
665 continue; \ 960 continue; \
666 } \ 961 } \
667 needed = (char*)(elf->data + offset); \ 962 needed = elf->data + offset; \
668 if (op == 0) { \ 963 if (op == 0) { \
964 /* -n -> print all entries */ \
669 if (!be_wewy_wewy_quiet) { \ 965 if (!be_wewy_wewy_quiet) { \
670 if (*found_needed) xchrcat(ret, ',', ret_len); \ 966 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \ 967 if (use_ldpath) { \
968 if ((p = lookup_config_lib(needed)) != NULL) \
969 needed = p; \
970 } else if (use_ldcache) { \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 971 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \ 972 needed = p; \
973 } \
674 xstrcat(ret, needed, ret_len); \ 974 xstrcat(ret, needed, ret_len); \
675 } \ 975 } \
676 *found_needed = 1; \ 976 *found_needed = 1; \
677 } else { \ 977 } else { \
678 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)) { \
679 *found_lib = 1; \ 991 *found_lib = 1; \
680 return (be_wewy_wewy_quiet ? NULL : needed); \ 992 return (be_wewy_wewy_quiet ? NULL : find_lib); \
681 } \ 993 } \
682 } \ 994 } \
683 } \ 995 } \
684 ++dyn; \ 996 ++dyn; \
685 } \ 997 } \
707 *found_interp = 1; \ 1019 *found_interp = 1; \
708 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)); \
709 } 1021 }
710 SHOW_INTERP(32) 1022 SHOW_INTERP(32)
711 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 } \
712 } 1037 }
1038 SHOW_PT_INTERP(32)
1039 SHOW_PT_INTERP(64)
1040 }
1041
713 return NULL; 1042 return NULL;
714} 1043}
715static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1044static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
716{ 1045{
717 unsigned long i; 1046 unsigned long i;
718 struct stat s; 1047 struct stat s;
1048 bool dynamic = false;
719 1049
720 if (!show_bind) return NULL; 1050 if (!show_bind) return NULL;
721 if (!elf->phdr) return NULL; 1051 if (!elf->phdr) return NULL;
722 1052
723#define SHOW_BIND(B) \ 1053#define SHOW_BIND(B) \
725 Elf ## B ## _Dyn *dyn; \ 1055 Elf ## B ## _Dyn *dyn; \
726 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1056 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
727 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1057 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
728 Elf ## B ## _Off offset; \ 1058 Elf ## B ## _Off offset; \
729 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1059 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
730 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; \
731 offset = EGET(phdr[i].p_offset); \ 1062 offset = EGET(phdr[i].p_offset); \
732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1063 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
733 dyn = DYN ## B (elf->data + offset); \ 1064 dyn = DYN ## B (elf->vdata + offset); \
734 while (EGET(dyn->d_tag) != DT_NULL) { \ 1065 while (EGET(dyn->d_tag) != DT_NULL) { \
735 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1066 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
736 (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)) \
737 { \ 1068 { \
738 if (be_quiet) return NULL; \ 1069 if (be_quiet) return NULL; \
746 SHOW_BIND(32) 1077 SHOW_BIND(32)
747 SHOW_BIND(64) 1078 SHOW_BIND(64)
748 1079
749 if (be_wewy_wewy_quiet) return NULL; 1080 if (be_wewy_wewy_quiet) return NULL;
750 1081
1082 /* don't output anything if quiet mode and the ELF is static or not setuid */
751 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 1083 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
752 return NULL; 1084 return NULL;
753 } else { 1085 } else {
754 *found_bind = 1; 1086 *found_bind = 1;
755 return (char *) "LAZY"; 1087 return dynamic ? "LAZY" : "STATIC";
756 } 1088 }
757} 1089}
758static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1090static char *scanelf_file_soname(elfobj *elf, char *found_soname)
759{ 1091{
760 unsigned long i; 1092 unsigned long i;
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1104 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1105 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1106 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \ 1107 Elf ## B ## _Off offset; \
776 /* only look for soname in shared objects */ \ 1108 /* only look for soname in shared objects */ \
777 if (ehdr->e_type != ET_DYN) \ 1109 if (EGET(ehdr->e_type) != ET_DYN) \
778 return NULL; \ 1110 return NULL; \
779 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
780 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; \
781 offset = EGET(phdr[i].p_offset); \ 1113 offset = EGET(phdr[i].p_offset); \
782 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1114 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
783 dyn = DYN ## B (elf->data + offset); \ 1115 dyn = DYN ## B (elf->vdata + offset); \
784 while (EGET(dyn->d_tag) != DT_NULL) { \ 1116 while (EGET(dyn->d_tag) != DT_NULL) { \
785 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1117 if (EGET(dyn->d_tag) == DT_SONAME) { \
786 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1118 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
787 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1119 if (offset >= (Elf ## B ## _Off)elf->len) { \
788 ++dyn; \ 1120 ++dyn; \
789 continue; \ 1121 continue; \
790 } \ 1122 } \
791 soname = (char*)(elf->data + offset); \ 1123 soname = elf->data + offset; \
792 *found_soname = 1; \ 1124 *found_soname = 1; \
793 return (be_wewy_wewy_quiet ? NULL : soname); \ 1125 return (be_wewy_wewy_quiet ? NULL : soname); \
794 } \ 1126 } \
795 ++dyn; \ 1127 ++dyn; \
796 } \ 1128 } \
799 SHOW_SONAME(64) 1131 SHOW_SONAME(64)
800 } 1132 }
801 1133
802 return NULL; 1134 return NULL;
803} 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
804static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1289static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
805{ 1290{
806 unsigned long i;
807 char *ret; 1291 char *ret;
808 void *symtab_void, *strtab_void; 1292 void *symtab_void, *strtab_void;
809 1293
810 if (!find_sym) return NULL; 1294 if (!find_sym) return NULL;
811 ret = find_sym; 1295 ret = NULL;
812 1296
813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1297 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
814 1298
815 if (symtab_void && strtab_void) { 1299 if (symtab_void && strtab_void) {
816#define FIND_SYM(B) \ 1300#define FIND_SYM(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \ 1301 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1302 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1303 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
820 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)); \
821 unsigned long cnt = EGET(symtab->sh_entsize); \ 1305 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
822 char *symname; \ 1306 char *symname; \
1307 size_t ret_len = 0; \
823 if (cnt) \ 1308 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \ 1309 cnt = EGET(symtab->sh_size) / cnt; \
825 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 } \
826 if (sym->st_name) { \ 1315 if (sym->st_name) { \
1316 /* make sure the symbol name is in acceptable memory range */ \
827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1317 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
828 if ((void*)symname > (void*)elf->data_end) { \ 1318 if ((void*)symname > elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \ 1319 warnf("%s: corrupt ELF symbols", elf->filename); \
1320 ++sym; \
830 continue; \ 1321 continue; \
831 } \ 1322 } \
832 if (*find_sym == '*') { \ 1323 scanelf_match_symname(elf, found_sym, \
833 printf("%s(%s) %5lX %15s %s\n", \ 1324 &ret, &ret_len, symname, \
834 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1325 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
835 elf->base_filename, \ 1326 ELF##B##_ST_BIND(EGET(sym->st_info)), \
836 (unsigned long)sym->st_size, \ 1327 EGET(sym->st_shndx), \
837 get_elfstttype(sym->st_info), \ 1328 /* st_size can be 64bit, but no one is really that big, so screw em */ \
838 symname); \ 1329 EGET(sym->st_size)); \
839 *found_sym = 1; \
840 } else { \
841 char *this_sym, *next_sym; \
842 this_sym = find_sym; \
843 do { \
844 next_sym = strchr(this_sym, ','); \
845 if (next_sym == NULL) \
846 next_sym = this_sym + strlen(this_sym); \
847 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
848 (strcmp(symname, versioned_symname) == 0)) { \
849 ret = this_sym; \
850 (*found_sym)++; \
851 goto break_out; \
852 } \
853 this_sym = next_sym + 1; \
854 } while (*next_sym != '\0'); \
855 } \
856 } \ 1330 } \
857 ++sym; \ 1331 ++sym; \
858 } } 1332 } \
1333 }
859 FIND_SYM(32) 1334 FIND_SYM(32)
860 FIND_SYM(64) 1335 FIND_SYM(64)
861 } 1336 }
862 1337
863break_out: 1338break_out:
866 if (*find_sym != '*' && *found_sym) 1341 if (*find_sym != '*' && *found_sym)
867 return ret; 1342 return ret;
868 if (be_quiet) 1343 if (be_quiet)
869 return NULL; 1344 return NULL;
870 else 1345 else
871 return (char *)" - "; 1346 return " - ";
872} 1347}
873 1348
1349static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1350{
1351 if (!find_section)
1352 return NULL;
1353
1354#define FIND_SECTION(B) \
1355 if (elf->elf_class == ELFCLASS ## B) { \
1356 size_t matched, n; \
1357 int invert; \
1358 const char *section_name; \
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); \
1364 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1365 if ((section == NULL && invert) || (section != NULL && !invert)) \
1366 ++matched; \
1367 } \
1368 \
1369 if (matched == array_cnt(find_section_arr)) \
1370 *found_section = 1; \
1371 }
1372 FIND_SECTION(32)
1373 FIND_SECTION(64)
1374
1375 if (be_wewy_wewy_quiet)
1376 return NULL;
1377
1378 if (*found_section)
1379 return find_section;
1380
1381 if (be_quiet)
1382 return NULL;
1383 else
1384 return " - ";
1385}
874 1386
875/* scan an elf file and show all the fun stuff */ 1387/* scan an elf file and show all the fun stuff */
876#define prints(str) write(fileno(stdout), str, strlen(str)) 1388#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
877static int scanelf_elfobj(elfobj *elf) 1389static int scanelf_elfobj(elfobj *elf)
878{ 1390{
879 unsigned long i; 1391 unsigned long i;
880 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1392 char found_pax, found_phdr, found_relro, found_load, found_textrel,
881 found_rpath, found_needed, found_interp, found_bind, found_soname, 1393 found_rpath, found_needed, found_interp, found_bind, found_soname,
882 found_sym, found_lib, found_file, found_textrels; 1394 found_sym, found_lib, found_file, found_textrels, found_section;
883 static char *out_buffer = NULL; 1395 static char *out_buffer = NULL;
884 static size_t out_len; 1396 static size_t out_len;
885 1397
886 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1398 found_pax = found_phdr = found_relro = found_load = found_textrel = \
887 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1399 found_rpath = found_needed = found_interp = found_bind = found_soname = \
888 found_sym = found_lib = found_file = found_textrels = 0; 1400 found_sym = found_lib = found_file = found_textrels = found_section = 0;
889 1401
890 if (be_verbose > 2) 1402 if (be_verbose > 2)
891 printf("%s: scanning file {%s,%s}\n", elf->filename, 1403 printf("%s: scanning file {%s,%s}\n", elf->filename,
892 get_elfeitype(EI_CLASS, elf->elf_class), 1404 get_elfeitype(EI_CLASS, elf->elf_class),
893 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1405 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
895 printf("%s: scanning file\n", elf->filename); 1407 printf("%s: scanning file\n", elf->filename);
896 1408
897 /* init output buffer */ 1409 /* init output buffer */
898 if (!out_buffer) { 1410 if (!out_buffer) {
899 out_len = sizeof(char) * 80; 1411 out_len = sizeof(char) * 80;
900 out_buffer = (char*)xmalloc(out_len); 1412 out_buffer = xmalloc(out_len);
901 } 1413 }
902 *out_buffer = '\0'; 1414 *out_buffer = '\0';
903 1415
904 /* show the header */ 1416 /* show the header */
905 if (!be_quiet && show_banner) { 1417 if (!be_quiet && show_banner) {
906 for (i = 0; out_format[i]; ++i) { 1418 for (i = 0; out_format[i]; ++i) {
907 if (!IS_MODIFIER(out_format[i])) continue; 1419 if (!IS_MODIFIER(out_format[i])) continue;
908 1420
909 switch (out_format[++i]) { 1421 switch (out_format[++i]) {
1422 case '+': break;
910 case '%': break; 1423 case '%': break;
911 case '#': break; 1424 case '#': break;
912 case 'F': 1425 case 'F':
913 case 'p': 1426 case 'p':
914 case 'f': prints("FILE "); found_file = 1; break; 1427 case 'f': prints("FILE "); found_file = 1; break;
915 case 'o': prints(" TYPE "); break; 1428 case 'o': prints(" TYPE "); break;
916 case 'x': prints(" PAX "); break; 1429 case 'x': prints(" PAX "); break;
917 case 'e': prints("STK/REL/PTL "); break; 1430 case 'e': prints("STK/REL/PTL "); break;
918 case 't': prints("TEXTREL "); break; 1431 case 't': prints("TEXTREL "); break;
919 case 'r': prints("RPATH "); break; 1432 case 'r': prints("RPATH "); break;
1433 case 'M': prints("CLASS "); break;
1434 case 'l':
920 case 'n': prints("NEEDED "); break; 1435 case 'n': prints("NEEDED "); break;
921 case 'i': prints("INTERP "); break; 1436 case 'i': prints("INTERP "); break;
922 case 'b': prints("BIND "); break; 1437 case 'b': prints("BIND "); break;
1438 case 'Z': prints("SIZE "); break;
923 case 'S': prints("SONAME "); break; 1439 case 'S': prints("SONAME "); break;
924 case 's': prints("SYM "); break; 1440 case 's': prints("SYM "); break;
925 case 'N': prints("LIB "); break; 1441 case 'N': prints("LIB "); break;
926 case 'T': prints("TEXTRELS "); break; 1442 case 'T': prints("TEXTRELS "); 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;
927 default: warnf("'%c' has no title ?", out_format[i]); 1449 default: warnf("'%c' has no title ?", out_format[i]);
928 } 1450 }
929 } 1451 }
930 if (!found_file) prints("FILE "); 1452 if (!found_file) prints("FILE ");
931 prints("\n"); 1453 prints("\n");
935 1457
936 /* dump all the good stuff */ 1458 /* dump all the good stuff */
937 for (i = 0; out_format[i]; ++i) { 1459 for (i = 0; out_format[i]; ++i) {
938 const char *out; 1460 const char *out;
939 const char *tmp; 1461 const char *tmp;
940 1462 static char ubuf[sizeof(unsigned long)*2];
941 /* make sure we trim leading spaces in quiet mode */
942 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
943 *out_buffer = '\0';
944
945 if (!IS_MODIFIER(out_format[i])) { 1463 if (!IS_MODIFIER(out_format[i])) {
946 xchrcat(&out_buffer, out_format[i], &out_len); 1464 xchrcat(&out_buffer, out_format[i], &out_len);
947 continue; 1465 continue;
948 } 1466 }
949 1467
950 out = NULL; 1468 out = NULL;
951 be_wewy_wewy_quiet = (out_format[i] == '#'); 1469 be_wewy_wewy_quiet = (out_format[i] == '#');
1470 be_semi_verbose = (out_format[i] == '+');
952 switch (out_format[++i]) { 1471 switch (out_format[++i]) {
1472 case '+':
953 case '%': 1473 case '%':
954 case '#': 1474 case '#':
955 xchrcat(&out_buffer, out_format[i], &out_len); break; 1475 xchrcat(&out_buffer, out_format[i], &out_len); break;
956 case 'F': 1476 case 'F':
957 found_file = 1; 1477 found_file = 1;
983 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1503 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
984 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1504 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
985 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1505 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
986 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;
987 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;
988 case 'n': 1511 case 'n':
989 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;
990 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1513 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
991 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1514 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
992 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1515 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
993 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1516 case 's': out = scanelf_file_sym(elf, &found_sym); 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;;
994 default: warnf("'%c' has no scan code?", out_format[i]); 1522 default: warnf("'%c' has no scan code?", out_format[i]);
995 } 1523 }
996 if (out) { 1524 if (out)
997 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
998 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
999 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1000 else
1001 xstrcat(&out_buffer, out, &out_len); 1525 xstrcat(&out_buffer, out, &out_len);
1002 }
1003 } 1526 }
1004 1527
1005#define FOUND_SOMETHING() \ 1528#define FOUND_SOMETHING() \
1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1529 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1007 found_rpath || found_needed || found_interp || found_bind || \ 1530 found_rpath || found_needed || found_interp || found_bind || \
1008 found_soname || found_sym || found_lib || found_textrels) 1531 found_soname || found_sym || found_lib || found_textrels || found_section )
1009 1532
1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1533 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1011 xchrcat(&out_buffer, ' ', &out_len); 1534 xchrcat(&out_buffer, ' ', &out_len);
1012 xstrcat(&out_buffer, elf->filename, &out_len); 1535 xstrcat(&out_buffer, elf->filename, &out_len);
1013 } 1536 }
1020} 1543}
1021 1544
1022/* scan a single elf */ 1545/* scan a single elf */
1023static int scanelf_elf(const char *filename, int fd, size_t len) 1546static int scanelf_elf(const char *filename, int fd, size_t len)
1024{ 1547{
1025 int ret; 1548 int ret = 1;
1026 elfobj *elf; 1549 elfobj *elf;
1027 1550
1028 /* verify this is real ELF */ 1551 /* verify this is real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1552 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1553 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return 1; 1554 return 2;
1032 } 1555 }
1033 1556 switch (match_bits) {
1557 case 32:
1558 if (elf->elf_class != ELFCLASS32)
1559 goto label_done;
1560 break;
1561 case 64:
1562 if (elf->elf_class != ELFCLASS64)
1563 goto label_done;
1564 break;
1565 default: break;
1566 }
1034 if (strlen(match_etypes)) { 1567 if (match_etypes) {
1035 char sbuf[126]; 1568 char sbuf[126];
1036 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1569 strncpy(sbuf, match_etypes, sizeof(sbuf));
1037 if (strchr(match_etypes, ',') != NULL) { 1570 if (strchr(match_etypes, ',') != NULL) {
1038 char *p; 1571 char *p;
1039 while((p = strrchr(sbuf, ',')) != NULL) { 1572 while ((p = strrchr(sbuf, ',')) != NULL) {
1040 *p = 0; 1573 *p = 0;
1041 if (atoi(p+1) == get_etype(elf)) 1574 if (etype_lookup(p+1) == get_etype(elf))
1042 goto label_ret; 1575 goto label_ret;
1043 } 1576 }
1044 } 1577 }
1045 if (atoi(sbuf) != get_etype(elf)) { 1578 if (etype_lookup(sbuf) != get_etype(elf))
1046 ret = 1;
1047 goto label_done; 1579 goto label_done;
1048 }
1049 } 1580 }
1050 1581
1051label_ret: 1582label_ret:
1052 ret = scanelf_elfobj(elf); 1583 ret = scanelf_elfobj(elf);
1053 1584
1066 1597
1067 ar = ar_open_fd(filename, fd); 1598 ar = ar_open_fd(filename, fd);
1068 if (ar == NULL) 1599 if (ar == NULL)
1069 return 1; 1600 return 1;
1070 1601
1071 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);
1072 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");
1073 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);
1074 if (elf) { 1608 if (elf) {
1075 scanelf_elfobj(elf); 1609 scanelf_elfobj(elf);
1076 unreadelf(elf); 1610 unreadelf(elf);
1077 } 1611 }
1078 } 1612 }
1079 munmap(ar_buffer, len); 1613 munmap(ar_buffer, len);
1080 1614
1081 return 0; 1615 return 0;
1082} 1616}
1083/* 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 */
1084static void scanelf_file(const char *filename) 1618static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1085{ 1619{
1620 const struct stat *st = st_cache;
1086 struct stat st; 1621 struct stat symlink_st;
1087 int fd; 1622 int fd;
1088 1623
1089 /* make sure 'filename' exists */
1090 if (lstat(filename, &st) == -1) {
1091 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1092 return;
1093 }
1094
1095 /* always handle regular files and handle symlinked files if no -y */ 1624 /* always handle regular files and handle symlinked files if no -y */
1096 if (S_ISLNK(st.st_mode)) { 1625 if (S_ISLNK(st->st_mode)) {
1097 if (!scan_symlink) return; 1626 if (!scan_symlink)
1098 stat(filename, &st); 1627 return 1;
1628 fstatat(dir_fd, filename, &symlink_st, 0);
1629 st = &symlink_st;
1099 } 1630 }
1631
1100 if (!S_ISREG(st.st_mode)) { 1632 if (!S_ISREG(st->st_mode)) {
1101 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1633 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1102 return; 1634 return 1;
1103 } 1635 }
1104 1636
1105 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));
1106 return; 1647 return 1;
1648 }
1107 1649
1108 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1650 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1109 /* 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)
1110 scanelf_archive(filename, fd, st.st_size); 1653 scanelf_archive(filename, fd, st->st_size);
1111 1654
1655 /*
1656 * unreadelf() implicitly closes its fd, so only close it
1657 * when we are returning it in the non-ELF case
1658 */
1112 close(fd); 1659 close(fd);
1660 }
1661
1662 return 0;
1113} 1663}
1114 1664
1115/* 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 */
1116static void scanelf_dir(const char *path) 1666static int scanelf_dirat(int dir_fd, const char *path)
1117{ 1667{
1118 register DIR *dir; 1668 register DIR *dir;
1119 register struct dirent *dentry; 1669 register struct dirent *dentry;
1120 struct stat st_top, st; 1670 struct stat st_top, st;
1121 char buf[__PAX_UTILS_PATH_MAX]; 1671 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1122 size_t pathlen = 0, len = 0; 1672 size_t pathlen = 0, len = 0;
1673 int ret = 0;
1674 int subdir_fd;
1123 1675
1124 /* make sure path exists */ 1676 /* make sure path exists */
1125 if (lstat(path, &st_top) == -1) { 1677 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1126 if (be_verbose > 2) printf("%s: does not exist\n", path); 1678 if (be_verbose > 2) printf("%s: does not exist\n", path);
1127 return; 1679 return 1;
1128 } 1680 }
1129 1681
1130 /* 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 */
1131 if (!S_ISDIR(st_top.st_mode)) { 1683 if (!S_ISDIR(st_top.st_mode))
1132 scanelf_file(path); 1684 return scanelf_fileat(dir_fd, path, &st_top);
1133 return;
1134 }
1135 1685
1136 /* now scan the dir looking for fun stuff */ 1686 /* now scan the dir looking for fun stuff */
1137 if ((dir = opendir(path)) == NULL) { 1687 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1138 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));
1139 return; 1697 return 1;
1140 } 1698 }
1141 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1699 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1142 1700
1143 pathlen = strlen(path); 1701 subpath = stpcpy(buf, path);
1702 if (subpath[-1] != '/')
1703 *subpath++ = '/';
1704 pathlen = subpath - buf;
1144 while ((dentry = readdir(dir))) { 1705 while ((dentry = readdir(dir))) {
1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1706 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1146 continue; 1707 continue;
1147 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1708
1148 if (len >= sizeof(buf)) { 1709 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1149 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1150 (unsigned long)len, (unsigned long)sizeof(buf));
1151 continue; 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;
1152 } 1717 }
1153 sprintf(buf, "%s/%s", path, dentry->d_name); 1718 memcpy(subpath, dentry->d_name, len);
1154 if (lstat(buf, &st) != -1) { 1719 subpath[len] = '\0';
1720
1155 if (S_ISREG(st.st_mode)) 1721 if (S_ISREG(st.st_mode))
1156 scanelf_file(buf); 1722 ret = scanelf_fileat(dir_fd, buf, &st);
1157 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1723 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1158 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1724 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1159 scanelf_dir(buf); 1725 ret = scanelf_dirat(dir_fd, buf);
1160 }
1161 } 1726 }
1162 } 1727 }
1163 closedir(dir); 1728 closedir(dir);
1164}
1165 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
1166static int scanelf_from_file(char *filename) 1737static int scanelf_from_file(const char *filename)
1167{ 1738{
1168 FILE *fp = NULL; 1739 FILE *fp;
1169 char *p; 1740 char *p, *path;
1170 char path[__PAX_UTILS_PATH_MAX]; 1741 size_t len;
1742 int ret;
1171 1743
1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1744 if (strcmp(filename, "-") == 0)
1173 fp = stdin; 1745 fp = stdin;
1174 else if ((fp = fopen(filename, "r")) == NULL) 1746 else if ((fp = fopen(filename, "r")) == NULL)
1175 return 1; 1747 return 1;
1176 1748
1177 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) {
1178 if ((p = strchr(path, '\n')) != NULL) 1753 if ((p = strchr(path, '\n')) != NULL)
1179 *p = 0; 1754 *p = 0;
1180 search_path = path; 1755 search_path = path;
1181 scanelf_dir(path); 1756 ret = scanelf_dir(path);
1182 } 1757 }
1758 free(path);
1759
1183 if (fp != stdin) 1760 if (fp != stdin)
1184 fclose(fp); 1761 fclose(fp);
1762
1185 return 0; 1763 return ret;
1186} 1764}
1187 1765
1188static void load_ld_so_conf() 1766#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1767
1768static int _load_ld_cache_config(const char *fname)
1189{ 1769{
1190 FILE *fp = NULL; 1770 FILE *fp = NULL;
1191 char *p; 1771 char *p, *path;
1192 char path[__PAX_UTILS_PATH_MAX]; 1772 size_t len;
1193 int i = 0; 1773 int curr_fd = -1;
1194 1774
1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1775 fp = fopenat_r(root_fd, root_rel_path(fname));
1776 if (fp == NULL)
1196 return; 1777 return -1;
1197 1778
1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1779 path = NULL;
1199 if (*path != '/') 1780 len = 0;
1200 continue; 1781 while (getline(&path, &len, fp) != -1) {
1201
1202 if ((p = strrchr(path, '\r')) != NULL) 1782 if ((p = strrchr(path, '\r')) != NULL)
1203 *p = 0; 1783 *p = 0;
1204 if ((p = strchr(path, '\n')) != NULL) 1784 if ((p = strchr(path, '\n')) != NULL)
1205 *p = 0; 1785 *p = 0;
1206 1786
1207 ldpaths[i++] = xstrdup(path); 1787 /* recursive includes of the same file will make this segfault. */
1788 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1789 glob_t gl;
1790 size_t x;
1791 const char *gpath;
1208 1792
1209 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1793 /* re-use existing path buffer ... need to be creative */
1210 break; 1794 if (path[8] != '/')
1795 gpath = memcpy(path + 3, "/etc/", 5);
1796 else
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 }
1806
1807 if (glob(gpath, 0, NULL, &gl) == 0) {
1808 for (x = 0; x < gl.gl_pathc; ++x) {
1809 /* try to avoid direct loops */
1810 if (strcmp(gl.gl_pathv[x], fname) == 0)
1811 continue;
1812 _load_ld_cache_config(gl.gl_pathv[x]);
1813 }
1814 globfree(&gl);
1815 }
1816
1817 /* failed globs are ignored by glibc */
1818 continue;
1211 } 1819 }
1212 ldpaths[i] = NULL; 1820
1821 if (*path != '/')
1822 continue;
1823
1824 xarraypush_str(ldpaths, path);
1825 }
1826 free(path);
1213 1827
1214 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
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");
1215} 1907}
1216 1908
1217/* scan /etc/ld.so.conf for paths */ 1909/* scan /etc/ld.so.conf for paths */
1218static void scanelf_ldpath() 1910static void scanelf_ldpath(void)
1219{ 1911{
1220 char scan_l, scan_ul, scan_ull; 1912 size_t n;
1221 int i = 0; 1913 const char *ldpath;
1222 1914
1223 if (!ldpaths[0]) 1915 array_for_each(ldpaths, n, ldpath)
1224 err("Unable to load any paths from ld.so.conf");
1225
1226 scan_l = scan_ul = scan_ull = 0;
1227
1228 while (ldpaths[i]) {
1229 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1230 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1231 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1232 scanelf_dir(ldpaths[i]); 1916 scanelf_dir(ldpath);
1233 ++i;
1234 }
1235
1236 if (!scan_l) scanelf_dir("/lib");
1237 if (!scan_ul) scanelf_dir("/usr/lib");
1238 if (!scan_ull) scanelf_dir("/usr/local/lib");
1239} 1917}
1240 1918
1241/* scan env PATH for paths */ 1919/* scan env PATH for paths */
1242static void scanelf_envpath() 1920static void scanelf_envpath(void)
1243{ 1921{
1244 char *path, *p; 1922 char *path, *p;
1245 1923
1246 path = getenv("PATH"); 1924 path = getenv("PATH");
1247 if (!path) 1925 if (!path)
1254 } 1932 }
1255 1933
1256 free(path); 1934 free(path);
1257} 1935}
1258 1936
1259 1937/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1260/* usage / invocation handling functions */
1261#define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:E:BhV" 1938#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1262#define a_argument required_argument 1939#define a_argument required_argument
1263static struct option const long_opts[] = { 1940static struct option const long_opts[] = {
1264 {"path", no_argument, NULL, 'p'}, 1941 {"path", no_argument, NULL, 'p'},
1265 {"ldpath", no_argument, NULL, 'l'}, 1942 {"ldpath", no_argument, NULL, 'l'},
1943 {"use-ldpath",no_argument, NULL, 129},
1944 {"root", a_argument, NULL, 128},
1266 {"recursive", no_argument, NULL, 'R'}, 1945 {"recursive", no_argument, NULL, 'R'},
1267 {"mount", no_argument, NULL, 'm'}, 1946 {"mount", no_argument, NULL, 'm'},
1268 {"symlink", no_argument, NULL, 'y'}, 1947 {"symlink", no_argument, NULL, 'y'},
1269 {"archives", no_argument, NULL, 'A'}, 1948 {"archives", no_argument, NULL, 'A'},
1270 {"ldcache", no_argument, NULL, 'L'}, 1949 {"ldcache", no_argument, NULL, 'L'},
1271 {"fix", no_argument, NULL, 'X'}, 1950 {"fix", no_argument, NULL, 'X'},
1951 {"setpax", a_argument, NULL, 'z'},
1272 {"pax", no_argument, NULL, 'x'}, 1952 {"pax", no_argument, NULL, 'x'},
1273 {"header", no_argument, NULL, 'e'}, 1953 {"header", no_argument, NULL, 'e'},
1274 {"textrel", no_argument, NULL, 't'}, 1954 {"textrel", no_argument, NULL, 't'},
1275 {"rpath", no_argument, NULL, 'r'}, 1955 {"rpath", no_argument, NULL, 'r'},
1276 {"needed", no_argument, NULL, 'n'}, 1956 {"needed", no_argument, NULL, 'n'},
1277 {"interp", no_argument, NULL, 'i'}, 1957 {"interp", no_argument, NULL, 'i'},
1278 {"bind", no_argument, NULL, 'b'}, 1958 {"bind", no_argument, NULL, 'b'},
1279 {"soname", no_argument, NULL, 'S'}, 1959 {"soname", no_argument, NULL, 'S'},
1280 {"symbol", a_argument, NULL, 's'}, 1960 {"symbol", a_argument, NULL, 's'},
1961 {"section", a_argument, NULL, 'k'},
1281 {"lib", a_argument, NULL, 'N'}, 1962 {"lib", a_argument, NULL, 'N'},
1282 {"gmatch", no_argument, NULL, 'g'}, 1963 {"gmatch", no_argument, NULL, 'g'},
1283 {"textrels", no_argument, NULL, 'T'}, 1964 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'}, 1965 {"etype", a_argument, NULL, 'E'},
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'},
1285 {"all", no_argument, NULL, 'a'}, 1972 {"all", no_argument, NULL, 'a'},
1286 {"quiet", no_argument, NULL, 'q'}, 1973 {"quiet", no_argument, NULL, 'q'},
1287 {"verbose", no_argument, NULL, 'v'}, 1974 {"verbose", no_argument, NULL, 'v'},
1288 {"format", a_argument, NULL, 'F'}, 1975 {"format", a_argument, NULL, 'F'},
1289 {"from", a_argument, NULL, 'f'}, 1976 {"from", a_argument, NULL, 'f'},
1290 {"file", a_argument, NULL, 'o'}, 1977 {"file", a_argument, NULL, 'o'},
1978 {"nocolor", no_argument, NULL, 'C'},
1291 {"nobanner", no_argument, NULL, 'B'}, 1979 {"nobanner", no_argument, NULL, 'B'},
1292 {"help", no_argument, NULL, 'h'}, 1980 {"help", no_argument, NULL, 'h'},
1293 {"version", no_argument, NULL, 'V'}, 1981 {"version", no_argument, NULL, 'V'},
1294 {NULL, no_argument, NULL, 0x0} 1982 {NULL, no_argument, NULL, 0x0}
1295}; 1983};
1296 1984
1297static const char *opts_help[] = { 1985static const char * const opts_help[] = {
1298 "Scan all directories in PATH environment", 1986 "Scan all directories in PATH environment",
1299 "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)",
1300 "Scan directories recursively", 1990 "Scan directories recursively",
1301 "Don't recursively cross mount points", 1991 "Don't recursively cross mount points",
1302 "Don't scan symlinks", 1992 "Don't scan symlinks",
1303 "Scan archives (.a files)", 1993 "Scan archives (.a files)",
1304 "Utilize ld.so.cache information (use with -r/-n)", 1994 "Utilize ld.so.cache to show full path (use with -r/-n)",
1305 "Try and 'fix' bad things (use with -r/-e)\n", 1995 "Try and 'fix' bad things (use with -r/-e)",
1996 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1306 "Print PaX markings", 1997 "Print PaX markings",
1307 "Print GNU_STACK/PT_LOAD markings", 1998 "Print GNU_STACK/PT_LOAD markings",
1308 "Print TEXTREL information", 1999 "Print TEXTREL information",
1309 "Print RPATH information", 2000 "Print RPATH information",
1310 "Print NEEDED information", 2001 "Print NEEDED information",
1311 "Print INTERP information", 2002 "Print INTERP information",
1312 "Print BIND information", 2003 "Print BIND information",
1313 "Print SONAME information", 2004 "Print SONAME information",
1314 "Find a specified symbol", 2005 "Find a specified symbol",
2006 "Find a specified section",
1315 "Find a specified library", 2007 "Find a specified library",
1316 "Use strncmp to match libraries. (use with -N)", 2008 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1317 "Locate cause of TEXTREL", 2009 "Locate cause of TEXTREL",
2010 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1318 "Print only ELF files matching numeric constant", 2011 "Print only ELF files matching numeric bits",
1319 "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",
1320 "Only output 'bad' things", 2018 "Only output 'bad' things",
1321 "Be verbose (can be specified more than once)", 2019 "Be verbose (can be specified more than once)",
1322 "Use specified format for output", 2020 "Use specified format for output",
1323 "Read input stream from a filename", 2021 "Read input stream from a filename",
1324 "Write output stream to a filename", 2022 "Write output stream to a filename",
2023 "Don't emit color in output",
1325 "Don't display the header", 2024 "Don't display the header",
1326 "Print this help and exit", 2025 "Print this help and exit",
1327 "Print version and exit", 2026 "Print version and exit",
1328 NULL 2027 NULL
1329}; 2028};
1330 2029
1331/* display usage and exit */ 2030/* display usage and exit */
1332static void usage(int status) 2031static void usage(int status)
1333{ 2032{
1334 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;
1335 printf("* Scan ELF binaries for stuff\n\n" 2037 printf("* Scan ELF binaries for stuff\n\n"
1336 "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);
1337 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;
1338 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 */
1339 if (long_opts[i].has_arg == no_argument) 2058 if (long_opts[i].has_arg == no_argument)
1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2059 printf("--%-*s", optlen, long_opts[i].name);
1341 long_opts[i].name, opts_help[i]);
1342 else 2060 else
1343 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2061 printf("--%s %s %*s", long_opts[i].name, a_arg,
1344 long_opts[i].name, opts_help[i]); 2062 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
1345 2063
1346 if (status != EXIT_SUCCESS) 2064 /* finally the help text */
1347 exit(status); 2065 printf("* %s\n", opts_help[i]);
2066 }
1348 2067
1349 puts("\nThe format modifiers for the -F option are:"); 2068 puts("\nFor more information, see the scanelf(1) manpage");
1350 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1351 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1352 puts(" i INTERP \tb BIND \ts symbol");
1353 puts(" N library \to Type \tT TEXTRELs");
1354 puts(" S SONAME");
1355 puts(" p filename (with search path removed)");
1356 puts(" f filename (short name/basename)");
1357 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1358
1359 exit(status); 2069 exit(status);
1360} 2070}
1361 2071
1362/* 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 }
1363static void parseargs(int argc, char *argv[]) 2081static int parseargs(int argc, char *argv[])
1364{ 2082{
1365 int i; 2083 int i;
1366 char *from_file = NULL; 2084 const char *from_file = NULL;
2085 int ret = 0;
2086 char load_cache_config = 0;
1367 2087
1368 opterr = 0; 2088 opterr = 0;
1369 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) {
1370 switch (i) { 2090 switch (i) {
1371 2091
1379 case 'f': 2099 case 'f':
1380 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");
1381 from_file = optarg; 2101 from_file = optarg;
1382 break; 2102 break;
1383 case 'E': 2103 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes)); 2104 match_etypes = optarg;
2105 break;
2106 case 'M':
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;
1385 break; 2118 break;
1386 case 'o': { 2119 case 'o': {
1387 FILE *fp = NULL;
1388 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2120 if (freopen(optarg, "w", stdout) == NULL)
1389 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2121 errp("Could not freopen(%s)", optarg);
1390 SET_STDOUT(fp);
1391 break; 2122 break;
1392 } 2123 }
1393 2124 case 'k':
2125 xarraypush_str(find_section_arr, optarg);
2126 break;
1394 case 's': { 2127 case 's': {
1395 if (find_sym) warn("You prob don't want to specify -s twice"); 2128 /* historically, this was comma delimited */
1396 find_sym = optarg; 2129 char *this_sym = strtok(optarg, ",");
1397 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1)); 2130 if (!this_sym) /* edge case: -s '' */
1398 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 }
1399 break; 2136 break;
1400 } 2137 }
1401 case 'N': { 2138 case 'N':
1402 if (find_lib) warn("You prob don't want to specify -N twice"); 2139 xarraypush_str(find_lib_arr, optarg);
1403 find_lib = optarg;
1404 break; 2140 break;
1405 }
1406
1407 case 'F': { 2141 case 'F': {
1408 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");
1409 out_format = optarg; 2143 out_format = optarg;
1410 break; 2144 break;
1411 } 2145 }
2146 case 'z': {
2147 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2148 size_t x;
1412 2149
1413 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 2150 for (x = 0; x < strlen(optarg); x++) {
2151 switch (optarg[x]) {
2152 case 'p':
2153 case 'P':
2154 do_pax_state(optarg[x], PAGEEXEC);
2155 break;
2156 case 's':
2157 case 'S':
2158 do_pax_state(optarg[x], SEGMEXEC);
2159 break;
2160 case 'm':
2161 case 'M':
2162 do_pax_state(optarg[x], MPROTECT);
2163 break;
2164 case 'e':
2165 case 'E':
2166 do_pax_state(optarg[x], EMUTRAMP);
2167 break;
2168 case 'r':
2169 case 'R':
2170 do_pax_state(optarg[x], RANDMMAP);
2171 break;
2172 case 'x':
2173 case 'X':
2174 do_pax_state(optarg[x], RANDEXEC);
2175 break;
2176 default:
2177 break;
2178 }
2179 }
2180 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2181 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2182 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2183 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2184 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2185 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2186 setpax = flags;
2187 break;
2188 }
2189 case 'Z': show_size = 1; break;
2190 case 'g': ++g_match; break;
1414 case 'L': use_ldcache = 1; break; 2191 case 'L': load_cache_config = use_ldcache = 1; break;
1415 case 'y': scan_symlink = 0; break; 2192 case 'y': scan_symlink = 0; break;
1416 case 'A': scan_archives = 1; break; 2193 case 'A': scan_archives = 1; break;
2194 case 'C': color_init(true); break;
1417 case 'B': show_banner = 0; break; 2195 case 'B': show_banner = 0; break;
1418 case 'l': scan_ldpath = 1; break; 2196 case 'l': load_cache_config = scan_ldpath = 1; break;
1419 case 'p': scan_envpath = 1; break; 2197 case 'p': scan_envpath = 1; break;
1420 case 'R': dir_recurse = 1; break; 2198 case 'R': dir_recurse = 1; break;
1421 case 'm': dir_crossmount = 0; break; 2199 case 'm': dir_crossmount = 0; break;
1422 case 'X': ++fix_elf; break; 2200 case 'X': ++fix_elf; break;
1423 case 'x': show_pax = 1; break; 2201 case 'x': show_pax = 1; break;
1427 case 'n': show_needed = 1; break; 2205 case 'n': show_needed = 1; break;
1428 case 'i': show_interp = 1; break; 2206 case 'i': show_interp = 1; break;
1429 case 'b': show_bind = 1; break; 2207 case 'b': show_bind = 1; break;
1430 case 'S': show_soname = 1; break; 2208 case 'S': show_soname = 1; break;
1431 case 'T': show_textrels = 1; break; 2209 case 'T': show_textrels = 1; break;
1432 case 'q': be_quiet = 1; break; 2210 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
1433 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2211 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
1434 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;
1435 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;
1436 case ':': 2222 case ':':
1437 err("Option '%c' is missing parameter", optopt); 2223 err("Option '%c' is missing parameter", optopt);
1438 case '?': 2224 case '?':
1439 err("Unknown option '%c' or argument missing", optopt); 2225 err("Unknown option '%c' or argument missing", optopt);
1440 default: 2226 default:
1441 err("Unhandled option '%c'; please report this", i); 2227 err("Unhandled option '%c'; please report this", i);
1442 } 2228 }
1443 } 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);
1444 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);
1445 /* let the format option override all other options */ 2273 /* let the format option override all other options */
1446 if (out_format) { 2274 if (out_format) {
1447 show_pax = show_phdr = show_textrel = show_rpath = \ 2275 show_pax = show_phdr = show_textrel = show_rpath = \
1448 show_needed = show_interp = show_bind = show_soname = \ 2276 show_needed = show_interp = show_bind = show_soname = \
1449 show_textrels = 0; 2277 show_textrels = show_perms = show_endian = show_size = \
2278 show_osabi = show_eabi = 0;
1450 for (i = 0; out_format[i]; ++i) { 2279 for (i = 0; out_format[i]; ++i) {
1451 if (!IS_MODIFIER(out_format[i])) continue; 2280 if (!IS_MODIFIER(out_format[i])) continue;
1452 2281
1453 switch (out_format[++i]) { 2282 switch (out_format[++i]) {
2283 case '+': break;
1454 case '%': break; 2284 case '%': break;
1455 case '#': break; 2285 case '#': break;
1456 case 'F': break; 2286 case 'F': break;
1457 case 'p': break; 2287 case 'p': break;
1458 case 'f': break; 2288 case 'f': break;
2289 case 'k': break;
1459 case 's': break; 2290 case 's': break;
1460 case 'N': break; 2291 case 'N': break;
1461 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;
1462 case 'x': show_pax = 1; break; 2300 case 'x': show_pax = 1; break;
1463 case 'e': show_phdr = 1; break; 2301 case 'e': show_phdr = 1; break;
1464 case 't': show_textrel = 1; break; 2302 case 't': show_textrel = 1; break;
1465 case 'r': show_rpath = 1; break; 2303 case 'r': show_rpath = 1; break;
1466 case 'n': show_needed = 1; break; 2304 case 'n': show_needed = 1; break;
1467 case 'i': show_interp = 1; break; 2305 case 'i': show_interp = 1; break;
1468 case 'b': show_bind = 1; break; 2306 case 'b': show_bind = 1; break;
1469 case 'S': show_soname = 1; break; 2307 case 'S': show_soname = 1; break;
1470 case 'T': show_textrels = 1; break; 2308 case 'T': show_textrels = 1; break;
1471 default: 2309 default:
1472 err("Invalid format specifier '%c' (byte %i)", 2310 err("invalid format specifier '%c' (byte %i)",
1473 out_format[i], i+1); 2311 out_format[i], i+1);
1474 } 2312 }
1475 } 2313 }
1476 2314
1477 /* construct our default format */ 2315 /* construct our default format */
1478 } else { 2316 } else {
1479 size_t fmt_len = 30; 2317 size_t fmt_len = 30;
1480 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2318 out_format = xmalloc(sizeof(char) * fmt_len);
2319 *out_format = '\0';
1481 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2320 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1482 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);
1483 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2327 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1484 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2328 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1485 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2329 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1486 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2330 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1487 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2331 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1488 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2332 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1489 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2333 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1490 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2334 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1491 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2335 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2336 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1492 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2337 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2338 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1494 } 2339 }
1495 if (be_verbose > 2) printf("Format: %s\n", out_format); 2340 if (be_verbose > 2) printf("Format: %s\n", out_format);
1496 2341
1497 /* now lets actually do the scanning */ 2342 /* now lets actually do the scanning */
1498 if (scan_ldpath || use_ldcache) 2343 if (load_cache_config)
1499 load_ld_so_conf(); 2344 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1500 if (scan_ldpath) scanelf_ldpath(); 2345 if (scan_ldpath) scanelf_ldpath();
1501 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 = "-";
1502 if (from_file) { 2349 if (from_file) {
1503 scanelf_from_file(from_file); 2350 scanelf_from_file(from_file);
1504 from_file = *argv; 2351 from_file = *argv;
1505 } 2352 }
1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2353 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1507 err("Nothing to scan !?"); 2354 err("Nothing to scan !?");
1508 while (optind < argc) { 2355 while (optind < argc) {
1509 search_path = argv[optind++]; 2356 search_path = argv[optind++];
1510 scanelf_dir(search_path); 2357 ret = scanelf_dir(search_path);
1511 } 2358 }
1512 2359
2360#ifdef __PAX_UTILS_CLEANUP
1513 /* clean up */ 2361 /* clean up */
1514 if (versioned_symname) free(versioned_symname);
1515 for (i = 0; ldpaths[i]; ++i)
1516 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 }
1517 2376
1518 if (ldcache != 0) 2377 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size); 2378 munmap(ldcache, ldcache_size);
1520} 2379#endif
1521 2380
1522
1523
1524/* utility funcs */
1525static char *xstrdup(const char *s)
1526{
1527 char *ret = strdup(s);
1528 if (!ret) err("Could not strdup(): %s", strerror(errno));
1529 return ret; 2381 return ret;
1530} 2382}
1531static void *xmalloc(size_t size)
1532{
1533 void *ret = malloc(size);
1534 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1535 return ret;
1536}
1537static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1538{
1539 size_t new_len;
1540 2383
1541 new_len = strlen(*dst) + strlen(src); 2384static char **get_split_env(const char *envvar)
1542 if (*curr_len <= new_len) {
1543 *curr_len = new_len + (*curr_len / 2);
1544 *dst = realloc(*dst, *curr_len);
1545 if (!*dst)
1546 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1547 }
1548
1549 if (n)
1550 strncat(*dst, src, n);
1551 else
1552 strcat(*dst, src);
1553}
1554static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1555{ 2385{
1556 static char my_app[2]; 2386 const char *delims = " \t\n";
1557 my_app[0] = append; 2387 char **envvals = NULL;
1558 my_app[1] = '\0'; 2388 char *env, *s;
1559 xstrcat(dst, my_app, curr_len); 2389 int nentry;
1560}
1561 2390
2391 if ((env = getenv(envvar)) == NULL)
2392 return NULL;
1562 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
1563 2435
1564int main(int argc, char *argv[]) 2436int main(int argc, char *argv[])
1565{ 2437{
2438 int ret;
1566 if (argc < 2) 2439 if (argc < 2)
1567 usage(EXIT_FAILURE); 2440 usage(EXIT_FAILURE);
2441 parseenv();
1568 parseargs(argc, argv); 2442 ret = parseargs(argc, argv);
1569 fclose(stdout); 2443 fclose(stdout);
1570#ifdef __BOUNDS_CHECKING_ON 2444#ifdef __PAX_UTILS_CLEANUP
1571 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 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");
1572#endif 2449#endif
1573 return EXIT_SUCCESS; 2450 return ret;
1574} 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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