/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.119 Revision 1.262
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 1.262 2014/03/20 08:06:01 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 1.262 2014/03/20 08:06:01 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 array_t _match_etypes = array_init_decl, *match_etypes = &_match_etypes;
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; \
382 /* let's flag -w/+x object files since the final ELF will most likely \
383 * need write access to the stack (who doesn't !?). so the combined \
384 * output will bring in +w automatically and that's bad. \
385 */ \
204 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 386 check_flags = /*SHF_WRITE|*/SHF_EXECINSTR; \
205 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 387 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
206 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 388 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
207 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 389 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
208 str = elf->data + offset; \ 390 str = elf->data + offset; \
209 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \ 391 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
221 break; \ 403 break; \
222 } \ 404 } \
223 } \ 405 } \
224 skip_this_shdr##B: \ 406 skip_this_shdr##B: \
225 if (!multi_stack) { \ 407 if (!multi_stack) { \
408 if (file_matches_list(elf->filename, qa_execstack)) \
409 return NULL; \
226 *found_phdr = 1; \ 410 *found_phdr = 1; \
227 shown = 1; \ 411 shown = 1; \
228 memcpy(ret, "!WX", 3); \ 412 memcpy(ret, "!WX", 3); \
229 } \ 413 } \
230 } \ 414 } \
235 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 419 if (be_wewy_wewy_quiet || (be_quiet && !shown))
236 return NULL; 420 return NULL;
237 else 421 else
238 return ret; 422 return ret;
239} 423}
424
425/*
426 * See if this ELF contains a DT_TEXTREL tag in any of its
427 * PT_DYNAMIC sections.
428 */
240static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 429static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
241{ 430{
242 static const char *ret = "TEXTREL"; 431 static const char *ret = "TEXTREL";
243 unsigned long i; 432 unsigned long i;
244 433
245 if (!show_textrel && !show_textrels) return NULL; 434 if (!show_textrel && !show_textrels) return NULL;
435
436 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
246 437
247 if (elf->phdr) { 438 if (elf->phdr) {
248#define SHOW_TEXTREL(B) \ 439#define SHOW_TEXTREL(B) \
249 if (elf->elf_class == ELFCLASS ## B) { \ 440 if (elf->elf_class == ELFCLASS ## B) { \
250 Elf ## B ## _Dyn *dyn; \ 441 Elf ## B ## _Dyn *dyn; \
251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 442 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 443 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
253 Elf ## B ## _Off offset; \ 444 Elf ## B ## _Off offset; \
254 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 445 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
255 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 446 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
256 offset = EGET(phdr[i].p_offset); \ 447 offset = EGET(phdr[i].p_offset); \
257 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 448 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
258 dyn = DYN ## B (elf->data + offset); \ 449 dyn = DYN ## B (elf->vdata + offset); \
259 while (EGET(dyn->d_tag) != DT_NULL) { \ 450 while (EGET(dyn->d_tag) != DT_NULL) { \
260 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 451 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
261 *found_textrel = 1; \ 452 *found_textrel = 1; \
262 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 453 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
263 return (be_wewy_wewy_quiet ? NULL : ret); \ 454 return (be_wewy_wewy_quiet ? NULL : ret); \
272 if (be_quiet || be_wewy_wewy_quiet) 463 if (be_quiet || be_wewy_wewy_quiet)
273 return NULL; 464 return NULL;
274 else 465 else
275 return " - "; 466 return " - ";
276} 467}
468
469/*
470 * Scan the .text section to see if there are any relocations in it.
471 * Should rewrite this to check PT_LOAD sections that are marked
472 * Executable rather than the section named '.text'.
473 */
277static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 474static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
278{ 475{
279 unsigned long s, r, rmax; 476 unsigned long s, r, rmax;
280 void *symtab_void, *strtab_void, *text_void; 477 void *symtab_void, *strtab_void, *text_void;
281 478
302 Elf ## B ## _Rela *rela; \ 499 Elf ## B ## _Rela *rela; \
303 /* search the section headers for relocations */ \ 500 /* search the section headers for relocations */ \
304 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 501 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
305 uint32_t sh_type = EGET(shdr[s].sh_type); \ 502 uint32_t sh_type = EGET(shdr[s].sh_type); \
306 if (sh_type == SHT_REL) { \ 503 if (sh_type == SHT_REL) { \
307 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 504 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
308 rela = NULL; \ 505 rela = NULL; \
309 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 506 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
310 } else if (sh_type == SHT_RELA) { \ 507 } else if (sh_type == SHT_RELA) { \
311 rel = NULL; \ 508 rel = NULL; \
312 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 509 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
313 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 510 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
314 } else \ 511 } else \
315 continue; \ 512 continue; \
316 /* now see if any of the relocs are in the .text */ \ 513 /* now see if any of the relocs are in the .text */ \
317 for (r = 0; r < rmax; ++r) { \ 514 for (r = 0; r < rmax; ++r) { \
332 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 529 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
333 if (be_verbose <= 2) continue; \ 530 if (be_verbose <= 2) continue; \
334 } else \ 531 } else \
335 *found_textrels = 1; \ 532 *found_textrels = 1; \
336 /* locate this relocation symbol name */ \ 533 /* locate this relocation symbol name */ \
337 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 534 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
338 if ((void*)sym > (void*)elf->data_end) { \ 535 if ((void*)sym > elf->data_end) { \
339 warn("%s: corrupt ELF symbol", elf->filename); \ 536 warn("%s: corrupt ELF symbol", elf->filename); \
340 continue; \ 537 continue; \
341 } \ 538 } \
342 sym_max = ELF ## B ## _R_SYM(r_info); \ 539 sym_max = ELF ## B ## _R_SYM(r_info); \
343 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 540 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
346 sym = NULL; \ 543 sym = NULL; \
347 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 544 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
348 /* show the raw details about this reloc */ \ 545 /* show the raw details about this reloc */ \
349 printf(" %s: ", elf->base_filename); \ 546 printf(" %s: ", elf->base_filename); \
350 if (sym && sym->st_name) \ 547 if (sym && sym->st_name) \
351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 548 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
352 else \ 549 else \
353 printf("(memory/fake?)"); \ 550 printf("(memory/data?)"); \
354 printf(" [0x%lX]", (unsigned long)r_offset); \ 551 printf(" [0x%lX]", (unsigned long)r_offset); \
355 /* now try to find the closest symbol that this rel is probably in */ \ 552 /* now try to find the closest symbol that this rel is probably in */ \
356 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 553 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
357 func = NULL; \ 554 func = NULL; \
358 offset_tmp = 0; \ 555 offset_tmp = 0; \
359 while (sym_max--) { \ 556 while (sym_max--) { \
360 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 557 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
361 func = sym; \ 558 func = sym; \
362 offset_tmp = EGET(sym->st_value); \ 559 offset_tmp = EGET(sym->st_value); \
363 } \ 560 } \
364 ++sym; \ 561 ++sym; \
365 } \ 562 } \
366 printf(" in "); \ 563 printf(" in "); \
367 if (func && func->st_name) \ 564 if (func && func->st_name) { \
368 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 565 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
566 if (r_offset > EGET(func->st_size)) \
567 printf("(optimized out: previous %s)", func_name); \
369 else \ 568 else \
370 printf("(NULL: fake?)"); \ 569 printf("%s", func_name); \
570 } else \
571 printf("(optimized out)"); \
371 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 572 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
573 if (be_verbose && has_objdump) { \
574 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
575 char *sysbuf; \
576 size_t syslen; \
577 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"; \
578 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
579 sysbuf = xmalloc(syslen); \
580 if (end_addr < r_offset) \
581 /* not uncommon when things are optimized out */ \
582 end_addr = r_offset + 0x100; \
583 snprintf(sysbuf, syslen, sysfmt, \
584 (unsigned long)offset_tmp, \
585 (unsigned long)end_addr, \
586 elf->filename, \
587 (unsigned long)r_offset); \
588 fflush(stdout); \
589 if (system(sysbuf)) {/* don't care */} \
590 fflush(stdout); \
591 free(sysbuf); \
592 } \
372 } \ 593 } \
373 } } 594 } }
374 SHOW_TEXTRELS(32) 595 SHOW_TEXTRELS(32)
375 SHOW_TEXTRELS(64) 596 SHOW_TEXTRELS(64)
376 } 597 }
378 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 599 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
379 600
380 return NULL; 601 return NULL;
381} 602}
382 603
383static void rpath_security_checks(elfobj *, char *, const char *);
384static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 604static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
385{ 605{
386 struct stat st; 606 struct stat st;
387 switch (*item) { 607 switch (*item) {
388 case '/': break; 608 case '/': break;
394 warnf("Security problem NULL %s in %s", dt_type, elf->filename); 614 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
395 break; 615 break;
396 case '$': 616 case '$':
397 if (fstat(elf->fd, &st) != -1) 617 if (fstat(elf->fd, &st) != -1)
398 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 618 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", 619 warnf("Security problem with %s='%s' in %s with mode set of %o",
400 dt_type, item, elf->filename, st.st_mode & 07777); 620 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
401 break; 621 break;
402 default: 622 default:
403 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename); 623 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
404 break; 624 break;
405 } 625 }
406} 626}
407static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 627static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
408{ 628{
409 unsigned long i, s; 629 unsigned long i;
410 char *rpath, *runpath, **r; 630 char *rpath, *runpath, **r;
411 void *strtbl_void; 631 void *strtbl_void;
412 632
413 if (!show_rpath) return; 633 if (!show_rpath) return;
414 634
425 Elf ## B ## _Off offset; \ 645 Elf ## B ## _Off offset; \
426 Elf ## B ## _Xword word; \ 646 Elf ## B ## _Xword word; \
427 /* Scan all the program headers */ \ 647 /* Scan all the program headers */ \
428 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 648 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
429 /* Just scan dynamic headers */ \ 649 /* Just scan dynamic headers */ \
430 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 650 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
431 offset = EGET(phdr[i].p_offset); \ 651 offset = EGET(phdr[i].p_offset); \
432 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 652 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
433 /* Just scan dynamic RPATH/RUNPATH headers */ \ 653 /* Just scan dynamic RPATH/RUNPATH headers */ \
434 dyn = DYN ## B (elf->data + offset); \ 654 dyn = DYN ## B (elf->vdata + offset); \
435 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 655 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
436 if (word == DT_RPATH) { \ 656 if (word == DT_RPATH) { \
437 r = &rpath; \ 657 r = &rpath; \
438 } else if (word == DT_RUNPATH) { \ 658 } else if (word == DT_RUNPATH) { \
439 r = &runpath; \ 659 r = &runpath; \
443 } \ 663 } \
444 /* Verify the memory is somewhat sane */ \ 664 /* Verify the memory is somewhat sane */ \
445 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 665 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
446 if (offset < (Elf ## B ## _Off)elf->len) { \ 666 if (offset < (Elf ## B ## _Off)elf->len) { \
447 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 667 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
448 *r = (char*)(elf->data + offset); \ 668 *r = elf->data + offset; \
449 /* cache the length in case we need to nuke this section later on */ \ 669 /* cache the length in case we need to nuke this section later on */ \
450 if (fix_elf) \ 670 if (fix_elf) \
451 offset = strlen(*r); \ 671 offset = strlen(*r); \
452 /* If quiet, don't output paths in ld.so.conf */ \ 672 /* If quiet, don't output paths in ld.so.conf */ \
453 if (be_quiet) { \ 673 if (be_quiet) { \
459 /* scan each path in : delimited list */ \ 679 /* scan each path in : delimited list */ \
460 while (start) { \ 680 while (start) { \
461 rpath_security_checks(elf, start, get_elfdtype(word)); \ 681 rpath_security_checks(elf, start, get_elfdtype(word)); \
462 end = strchr(start, ':'); \ 682 end = strchr(start, ':'); \
463 len = (end ? abs(end - start) : strlen(start)); \ 683 len = (end ? abs(end - start) : strlen(start)); \
464 if (use_ldcache) \ 684 if (use_ldcache) { \
465 for (s = 0; ldpaths[s]; ++s) \ 685 size_t n; \
686 const char *ldpath; \
687 array_for_each(ldpaths, n, ldpath) \
466 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 688 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
467 *r = end; \ 689 *r = end; \
468 /* corner case ... if RPATH reads "/usr/lib:", we want \ 690 /* corner case ... if RPATH reads "/usr/lib:", we want \
469 * to show ':' rather than '' */ \ 691 * to show ':' rather than '' */ \
470 if (end && end[1] != '\0') \ 692 if (end && end[1] != '\0') \
471 (*r)++; \ 693 (*r)++; \
472 break; \ 694 break; \
473 } \ 695 } \
696 } \
474 if (!*r || !end) \ 697 if (!*r || !end) \
475 break; \ 698 break; \
476 else \ 699 else \
477 start = start + len + 1; \ 700 start = start + len + 1; \
478 } \ 701 } \
544 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 767 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
545 else if (!be_quiet) 768 else if (!be_quiet)
546 xstrcat(ret, " - ", ret_len); 769 xstrcat(ret, " - ", ret_len);
547} 770}
548 771
772/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
549#define LDSO_CACHE_MAGIC "ld.so-" 773#define LDSO_CACHE_MAGIC "ld.so-"
550#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 774#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
551#define LDSO_CACHE_VER "1.7.0" 775#define LDSO_CACHE_VER "1.7.0"
552#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 776#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
553#define FLAG_ANY -1 777#define FLAG_ANY -1
562#define FLAG_X8664_LIB64 0x0300 786#define FLAG_X8664_LIB64 0x0300
563#define FLAG_S390_LIB64 0x0400 787#define FLAG_S390_LIB64 0x0400
564#define FLAG_POWERPC_LIB64 0x0500 788#define FLAG_POWERPC_LIB64 0x0500
565#define FLAG_MIPS64_LIBN32 0x0600 789#define FLAG_MIPS64_LIBN32 0x0600
566#define FLAG_MIPS64_LIBN64 0x0700 790#define FLAG_MIPS64_LIBN64 0x0700
791#define FLAG_X8664_LIBX32 0x0800
792#define FLAG_ARM_LIBHF 0x0900
793#define FLAG_AARCH64_LIB64 0x0a00
567 794
568static char *lookup_cache_lib(elfobj *, char *); 795#if defined(__GLIBC__) || defined(__UCLIBC__)
796
569static char *lookup_cache_lib(elfobj *elf, char *fname) 797static char *lookup_cache_lib(elfobj *elf, const char *fname)
570{ 798{
571 int fd = 0; 799 int fd;
572 char *strs; 800 char *strs;
573 static char buf[__PAX_UTILS_PATH_MAX] = ""; 801 static char buf[__PAX_UTILS_PATH_MAX] = "";
574 const char *cachefile = "/etc/ld.so.cache"; 802 const char *cachefile = root_rel_path("/etc/ld.so.cache");
575 struct stat st; 803 struct stat st;
576 804
577 typedef struct { 805 typedef struct {
578 char magic[LDSO_CACHE_MAGIC_LEN]; 806 char magic[LDSO_CACHE_MAGIC_LEN];
579 char version[LDSO_CACHE_VER_LEN]; 807 char version[LDSO_CACHE_VER_LEN];
589 libentry_t *libent; 817 libentry_t *libent;
590 818
591 if (fname == NULL) 819 if (fname == NULL)
592 return NULL; 820 return NULL;
593 821
594 if (ldcache == 0) { 822 if (ldcache == NULL) {
595 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 823 if (fstatat(root_fd, cachefile, &st, 0))
824 return NULL;
825
826 fd = openat(root_fd, cachefile, O_RDONLY);
827 if (fd == -1)
596 return NULL; 828 return NULL;
597 829
598 /* cache these values so we only map/unmap the cache file once */ 830 /* cache these values so we only map/unmap the cache file once */
599 ldcache_size = st.st_size; 831 ldcache_size = st.st_size;
600 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 832 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
601
602 close(fd); 833 close(fd);
603 834
604 if (ldcache == (caddr_t)-1) { 835 if (ldcache == MAP_FAILED) {
605 ldcache = 0; 836 ldcache = NULL;
606 return NULL; 837 return NULL;
607 } 838 }
608 839
609 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 840 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
841 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
842 {
843 munmap(ldcache, ldcache_size);
844 ldcache = NULL;
610 return NULL; 845 return NULL;
611 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
612 return NULL;
613 } 846 }
847 } else
848 header = ldcache;
614 849
615 header = (header_t *) ldcache;
616 libent = (libentry_t *) (ldcache + sizeof(header_t)); 850 libent = ldcache + sizeof(header_t);
617 strs = (char *) &libent[header->nlibs]; 851 strs = (char *) &libent[header->nlibs];
618 852
619 for (fd = 0; fd < header->nlibs; fd++) { 853 for (fd = 0; fd < header->nlibs; ++fd) {
620 /* this should be more fine grained, but for now we assume that 854 /* This should be more fine grained, but for now we assume that
621 * diff arches will not be cached together. and we ignore the 855 * diff arches will not be cached together, and we ignore the
622 * the different multilib mips cases. */ 856 * the different multilib mips cases.
857 */
623 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 858 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
624 continue; 859 continue;
625 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 860 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
626 continue; 861 continue;
627 862
628 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 863 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
629 continue; 864 continue;
865
866 /* Return first hit because that is how the ldso rolls */
630 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 867 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
868 break;
631 } 869 }
870
632 return buf; 871 return buf;
633} 872}
634 873
874#elif defined(__NetBSD__)
875static char *lookup_cache_lib(elfobj *elf, const char *fname)
876{
877 static char buf[__PAX_UTILS_PATH_MAX] = "";
878 static struct stat st;
879 size_t n;
880 char *ldpath;
881
882 array_for_each(ldpath, n, ldpath) {
883 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
884 continue; /* if the pathname is too long, or something went wrong, ignore */
885
886 if (stat(buf, &st) != 0)
887 continue; /* if the lib doesn't exist in *ldpath, look further */
888
889 /* NetBSD doesn't actually do sanity checks, it just loads the file
890 * and if that doesn't work, continues looking in other directories.
891 * This cannot easily be safely emulated, unfortunately. For now,
892 * just assume that if it exists, it's a valid library. */
893
894 return buf;
895 }
896
897 /* not found in any path */
898 return NULL;
899}
900#else
901#ifdef __ELF__
902#warning Cache support not implemented for your target
903#endif
904static char *lookup_cache_lib(elfobj *elf, const char *fname)
905{
906 return NULL;
907}
908#endif
909
910static char *lookup_config_lib(const char *fname)
911{
912 static char buf[__PAX_UTILS_PATH_MAX] = "";
913 const char *ldpath;
914 size_t n;
915
916 array_for_each(ldpaths, n, ldpath) {
917 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
918 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
919 return buf;
920 }
921
922 return NULL;
923}
635 924
636static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 925static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
637{ 926{
638 unsigned long i; 927 unsigned long i;
639 char *needed; 928 char *needed;
640 void *strtbl_void; 929 void *strtbl_void;
641 char *p; 930 char *p;
642 931
932 /*
933 * -n -> op==0 -> print all
934 * -N -> op==1 -> print requested
935 */
643 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 936 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
937 return NULL;
644 938
645 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 939 strtbl_void = elf_findsecbyname(elf, ".dynstr");
646 940
647 if (elf->phdr && strtbl_void) { 941 if (elf->phdr && strtbl_void) {
648#define SHOW_NEEDED(B) \ 942#define SHOW_NEEDED(B) \
650 Elf ## B ## _Dyn *dyn; \ 944 Elf ## B ## _Dyn *dyn; \
651 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 945 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
652 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 946 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
653 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 947 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
654 Elf ## B ## _Off offset; \ 948 Elf ## B ## _Off offset; \
949 size_t matched = 0; \
950 /* Walk all the program headers to find the PT_DYNAMIC */ \
655 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 951 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
656 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 952 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
953 continue; \
657 offset = EGET(phdr[i].p_offset); \ 954 offset = EGET(phdr[i].p_offset); \
658 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 955 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
956 continue; \
957 /* Walk all the dynamic tags to find NEEDED entries */ \
659 dyn = DYN ## B (elf->data + offset); \ 958 dyn = DYN ## B (elf->vdata + offset); \
660 while (EGET(dyn->d_tag) != DT_NULL) { \ 959 while (EGET(dyn->d_tag) != DT_NULL) { \
661 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 960 if (EGET(dyn->d_tag) == DT_NEEDED) { \
662 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 961 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
663 if (offset >= (Elf ## B ## _Off)elf->len) { \ 962 if (offset >= (Elf ## B ## _Off)elf->len) { \
664 ++dyn; \ 963 ++dyn; \
665 continue; \ 964 continue; \
666 } \ 965 } \
667 needed = (char*)(elf->data + offset); \ 966 needed = elf->data + offset; \
668 if (op == 0) { \ 967 if (op == 0) { \
968 /* -n -> print all entries */ \
669 if (!be_wewy_wewy_quiet) { \ 969 if (!be_wewy_wewy_quiet) { \
670 if (*found_needed) xchrcat(ret, ',', ret_len); \ 970 if (*found_needed) xchrcat(ret, ',', ret_len); \
671 if (use_ldcache) \ 971 if (use_ldpath) { \
972 if ((p = lookup_config_lib(needed)) != NULL) \
973 needed = p; \
974 } else if (use_ldcache) { \
672 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 975 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
673 needed = p; \ 976 needed = p; \
977 } \
674 xstrcat(ret, needed, ret_len); \ 978 xstrcat(ret, needed, ret_len); \
675 } \ 979 } \
676 *found_needed = 1; \ 980 *found_needed = 1; \
677 } else { \ 981 } else { \
678 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 982 /* -N -> print matching entries */ \
983 size_t n; \
984 const char *find_lib_name; \
985 \
986 array_for_each(find_lib_arr, n, find_lib_name) { \
987 int invert = 1; \
988 if (find_lib_name[0] == '!') \
989 invert = 0, ++find_lib_name; \
990 if (!strcmp(find_lib_name, needed) == invert) \
991 ++matched; \
992 } \
993 \
994 if (matched == array_cnt(find_lib_arr)) { \
679 *found_lib = 1; \ 995 *found_lib = 1; \
680 return (be_wewy_wewy_quiet ? NULL : needed); \ 996 return (be_wewy_wewy_quiet ? NULL : find_lib); \
681 } \ 997 } \
682 } \ 998 } \
683 } \ 999 } \
684 ++dyn; \ 1000 ++dyn; \
685 } \ 1001 } \
707 *found_interp = 1; \ 1023 *found_interp = 1; \
708 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ 1024 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
709 } 1025 }
710 SHOW_INTERP(32) 1026 SHOW_INTERP(32)
711 SHOW_INTERP(64) 1027 SHOW_INTERP(64)
1028 } else {
1029 /* Walk all the program headers to find the PT_INTERP */
1030#define SHOW_PT_INTERP(B) \
1031 if (elf->elf_class == ELFCLASS ## B) { \
1032 unsigned long i; \
1033 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1034 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1035 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1036 if (EGET(phdr[i].p_type) != PT_INTERP) \
1037 continue; \
1038 *found_interp = 1; \
1039 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1040 } \
712 } 1041 }
1042 SHOW_PT_INTERP(32)
1043 SHOW_PT_INTERP(64)
1044 }
1045
713 return NULL; 1046 return NULL;
714} 1047}
715static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1048static const char *scanelf_file_bind(elfobj *elf, char *found_bind)
716{ 1049{
717 unsigned long i; 1050 unsigned long i;
718 struct stat s; 1051 struct stat s;
1052 bool dynamic = false;
719 1053
720 if (!show_bind) return NULL; 1054 if (!show_bind) return NULL;
721 if (!elf->phdr) return NULL; 1055 if (!elf->phdr) return NULL;
722 1056
723#define SHOW_BIND(B) \ 1057#define SHOW_BIND(B) \
725 Elf ## B ## _Dyn *dyn; \ 1059 Elf ## B ## _Dyn *dyn; \
726 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1060 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
727 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1061 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
728 Elf ## B ## _Off offset; \ 1062 Elf ## B ## _Off offset; \
729 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1063 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
730 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1064 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1065 dynamic = true; \
731 offset = EGET(phdr[i].p_offset); \ 1066 offset = EGET(phdr[i].p_offset); \
732 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1067 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
733 dyn = DYN ## B (elf->data + offset); \ 1068 dyn = DYN ## B (elf->vdata + offset); \
734 while (EGET(dyn->d_tag) != DT_NULL) { \ 1069 while (EGET(dyn->d_tag) != DT_NULL) { \
735 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1070 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
736 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1071 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
737 { \ 1072 { \
738 if (be_quiet) return NULL; \ 1073 if (be_quiet) return NULL; \
746 SHOW_BIND(32) 1081 SHOW_BIND(32)
747 SHOW_BIND(64) 1082 SHOW_BIND(64)
748 1083
749 if (be_wewy_wewy_quiet) return NULL; 1084 if (be_wewy_wewy_quiet) return NULL;
750 1085
1086 /* 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)) { 1087 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
752 return NULL; 1088 return NULL;
753 } else { 1089 } else {
754 *found_bind = 1; 1090 *found_bind = 1;
755 return (char *) "LAZY"; 1091 return dynamic ? "LAZY" : "STATIC";
756 } 1092 }
757} 1093}
758static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1094static char *scanelf_file_soname(elfobj *elf, char *found_soname)
759{ 1095{
760 unsigned long i; 1096 unsigned long i;
772 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1108 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
773 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1109 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
774 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1110 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
775 Elf ## B ## _Off offset; \ 1111 Elf ## B ## _Off offset; \
776 /* only look for soname in shared objects */ \ 1112 /* only look for soname in shared objects */ \
777 if (ehdr->e_type != ET_DYN) \ 1113 if (EGET(ehdr->e_type) != ET_DYN) \
778 return NULL; \ 1114 return NULL; \
779 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1115 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
780 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 1116 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
781 offset = EGET(phdr[i].p_offset); \ 1117 offset = EGET(phdr[i].p_offset); \
782 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1118 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
783 dyn = DYN ## B (elf->data + offset); \ 1119 dyn = DYN ## B (elf->vdata + offset); \
784 while (EGET(dyn->d_tag) != DT_NULL) { \ 1120 while (EGET(dyn->d_tag) != DT_NULL) { \
785 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1121 if (EGET(dyn->d_tag) == DT_SONAME) { \
786 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1122 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
787 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1123 if (offset >= (Elf ## B ## _Off)elf->len) { \
788 ++dyn; \ 1124 ++dyn; \
789 continue; \ 1125 continue; \
790 } \ 1126 } \
791 soname = (char*)(elf->data + offset); \ 1127 soname = elf->data + offset; \
792 *found_soname = 1; \ 1128 *found_soname = 1; \
793 return (be_wewy_wewy_quiet ? NULL : soname); \ 1129 return (be_wewy_wewy_quiet ? NULL : soname); \
794 } \ 1130 } \
795 ++dyn; \ 1131 ++dyn; \
796 } \ 1132 } \
799 SHOW_SONAME(64) 1135 SHOW_SONAME(64)
800 } 1136 }
801 1137
802 return NULL; 1138 return NULL;
803} 1139}
1140
1141/*
1142 * We support the symbol form:
1143 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1144 * If the symbol name is empty, then all symbols are matched.
1145 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1146 * Do not rely on this output format at all.
1147 * Otherwise the symbol name is used to search (either regex or string compare).
1148 * If the first char of the symbol name is a plus ("+"), then only match
1149 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1150 * Putting modifiers in between the percent signs allows for more in depth
1151 * filters. There are groups of modifiers. If you don't specify a member
1152 * of a group, then all types in that group are matched. The current
1153 * groups and their types are:
1154 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1155 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1156 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1157 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1158 * You can search for multiple symbols at once by seperating with a comma (",").
1159 *
1160 * Some examples:
1161 * ELFs with a weak function "foo":
1162 * scanelf -s %wf%foo <ELFs>
1163 * ELFs that define the symbol "main":
1164 * scanelf -s +main <ELFs>
1165 * scanelf -s %d%main <ELFs>
1166 * ELFs that refer to the undefined symbol "brk":
1167 * scanelf -s -brk <ELFs>
1168 * scanelf -s %u%brk <ELFs>
1169 * All global defined objects in an ELF:
1170 * scanelf -s %ogd% <ELF>
1171 */
1172static void
1173scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1174 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1175{
1176 const char *this_sym;
1177 size_t n;
1178
1179 array_for_each(find_sym_arr, n, this_sym) {
1180 bool inc_notype, inc_object, inc_func, inc_file,
1181 inc_local, inc_global, inc_weak,
1182 inc_def, inc_undef, inc_abs, inc_common;
1183
1184 /* symbol selection! */
1185 inc_notype = inc_object = inc_func = inc_file = \
1186 inc_local = inc_global = inc_weak = \
1187 inc_def = inc_undef = inc_abs = inc_common = \
1188 (*this_sym != '%');
1189
1190 /* parse the contents of %...% */
1191 if (!inc_notype) {
1192 while (*(this_sym++)) {
1193 if (*this_sym == '%') {
1194 ++this_sym;
1195 break;
1196 }
1197 switch (*this_sym) {
1198 case 'n': inc_notype = true; break;
1199 case 'o': inc_object = true; break;
1200 case 'f': inc_func = true; break;
1201 case 'F': inc_file = true; break;
1202 case 'l': inc_local = true; break;
1203 case 'g': inc_global = true; break;
1204 case 'w': inc_weak = true; break;
1205 case 'd': inc_def = true; break;
1206 case 'u': inc_undef = true; break;
1207 case 'a': inc_abs = true; break;
1208 case 'c': inc_common = true; break;
1209 default: err("invalid symbol selector '%c'", *this_sym);
1210 }
1211 }
1212
1213 /* If no types are matched, not match all */
1214 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1215 inc_notype = inc_object = inc_func = inc_file = true;
1216 if (!inc_local && !inc_global && !inc_weak)
1217 inc_local = inc_global = inc_weak = true;
1218 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1219 inc_def = inc_undef = inc_abs = inc_common = true;
1220
1221 /* backwards compat for defined/undefined short hand */
1222 } else if (*this_sym == '+') {
1223 inc_undef = false;
1224 ++this_sym;
1225 } else if (*this_sym == '-') {
1226 inc_def = inc_abs = inc_common = false;
1227 ++this_sym;
1228 }
1229
1230 /* filter symbols */
1231 if ((!inc_notype && stt == STT_NOTYPE) || \
1232 (!inc_object && stt == STT_OBJECT) || \
1233 (!inc_func && stt == STT_FUNC ) || \
1234 (!inc_file && stt == STT_FILE ) || \
1235 (!inc_local && stb == STB_LOCAL ) || \
1236 (!inc_global && stb == STB_GLOBAL) || \
1237 (!inc_weak && stb == STB_WEAK ) || \
1238 (!inc_def && shn && shn < SHN_LORESERVE) || \
1239 (!inc_undef && shn == SHN_UNDEF ) || \
1240 (!inc_abs && shn == SHN_ABS ) || \
1241 (!inc_common && shn == SHN_COMMON))
1242 continue;
1243
1244 if (*this_sym == '*') {
1245 /* a "*" symbol gets you debug output */
1246 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1247 ((*found_sym == 0) ? "\n\t" : "\t"),
1248 elf->base_filename,
1249 size,
1250 get_elfstttype(stt),
1251 get_elfstbtype(stb),
1252 get_elfshntype(shn),
1253 symname);
1254 goto matched;
1255
1256 } else {
1257 if (g_match) {
1258 /* regex match the symbol */
1259 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1260 continue;
1261
1262 } else if (*this_sym) {
1263 /* give empty symbols a "pass", else do a normal compare */
1264 const size_t len = strlen(this_sym);
1265 if (!(strncmp(this_sym, symname, len) == 0 &&
1266 /* Accept unversioned symbol names */
1267 (symname[len] == '\0' || symname[len] == '@')))
1268 continue;
1269 }
1270
1271 if (be_semi_verbose) {
1272 char buf[1024];
1273 snprintf(buf, sizeof(buf), "%lX %s %s",
1274 size,
1275 get_elfstttype(stt),
1276 this_sym);
1277 *ret = xstrdup(buf);
1278 } else {
1279 if (*ret) xchrcat(ret, ',', ret_len);
1280 xstrcat(ret, symname, ret_len);
1281 }
1282
1283 goto matched;
1284 }
1285 }
1286
1287 return;
1288
1289 matched:
1290 *found_sym = 1;
1291}
1292
804static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1293static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
805{ 1294{
806 unsigned long i;
807 char *ret; 1295 char *ret;
808 void *symtab_void, *strtab_void; 1296 void *symtab_void, *strtab_void;
809 1297
810 if (!find_sym) return NULL; 1298 if (!find_sym) return NULL;
811 ret = find_sym; 1299 ret = NULL;
812 1300
813 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1301 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
814 1302
815 if (symtab_void && strtab_void) { 1303 if (symtab_void && strtab_void) {
816#define FIND_SYM(B) \ 1304#define FIND_SYM(B) \
817 if (elf->elf_class == ELFCLASS ## B) { \ 1305 if (elf->elf_class == ELFCLASS ## B) { \
818 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1306 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
819 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1307 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
820 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1308 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
821 unsigned long cnt = EGET(symtab->sh_entsize); \ 1309 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
822 char *symname; \ 1310 char *symname; \
1311 size_t ret_len = 0; \
823 if (cnt) \ 1312 if (cnt) \
824 cnt = EGET(symtab->sh_size) / cnt; \ 1313 cnt = EGET(symtab->sh_size) / cnt; \
825 for (i = 0; i < cnt; ++i) { \ 1314 for (i = 0; i < cnt; ++i) { \
1315 if ((void*)sym > elf->data_end) { \
1316 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1317 goto break_out; \
1318 } \
826 if (sym->st_name) { \ 1319 if (sym->st_name) { \
1320 /* make sure the symbol name is in acceptable memory range */ \
827 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1321 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
828 if ((void*)symname > (void*)elf->data_end) { \ 1322 if ((void*)symname > elf->data_end) { \
829 warnf("%s: corrupt ELF symbols", elf->filename); \ 1323 warnf("%s: corrupt ELF symbols", elf->filename); \
1324 ++sym; \
830 continue; \ 1325 continue; \
831 } \ 1326 } \
832 if (*find_sym == '*') { \ 1327 scanelf_match_symname(elf, found_sym, \
833 printf("%s(%s) %5lX %15s %s\n", \ 1328 &ret, &ret_len, symname, \
834 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1329 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
835 elf->base_filename, \ 1330 ELF##B##_ST_BIND(EGET(sym->st_info)), \
836 (unsigned long)sym->st_size, \ 1331 EGET(sym->st_shndx), \
837 get_elfstttype(sym->st_info), \ 1332 /* st_size can be 64bit, but no one is really that big, so screw em */ \
838 symname); \ 1333 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 } \ 1334 } \
857 ++sym; \ 1335 ++sym; \
858 } } 1336 } \
1337 }
859 FIND_SYM(32) 1338 FIND_SYM(32)
860 FIND_SYM(64) 1339 FIND_SYM(64)
861 } 1340 }
862 1341
863break_out: 1342break_out:
866 if (*find_sym != '*' && *found_sym) 1345 if (*find_sym != '*' && *found_sym)
867 return ret; 1346 return ret;
868 if (be_quiet) 1347 if (be_quiet)
869 return NULL; 1348 return NULL;
870 else 1349 else
871 return (char *)" - "; 1350 return " - ";
872} 1351}
873 1352
1353static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1354{
1355 if (!find_section)
1356 return NULL;
1357
1358#define FIND_SECTION(B) \
1359 if (elf->elf_class == ELFCLASS ## B) { \
1360 size_t matched, n; \
1361 int invert; \
1362 const char *section_name; \
1363 Elf ## B ## _Shdr *section; \
1364 \
1365 matched = 0; \
1366 array_for_each(find_section_arr, n, section_name) { \
1367 invert = (*section_name == '!' ? 1 : 0); \
1368 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1369 if ((section == NULL && invert) || (section != NULL && !invert)) \
1370 ++matched; \
1371 } \
1372 \
1373 if (matched == array_cnt(find_section_arr)) \
1374 *found_section = 1; \
1375 }
1376 FIND_SECTION(32)
1377 FIND_SECTION(64)
1378
1379 if (be_wewy_wewy_quiet)
1380 return NULL;
1381
1382 if (*found_section)
1383 return find_section;
1384
1385 if (be_quiet)
1386 return NULL;
1387 else
1388 return " - ";
1389}
874 1390
875/* scan an elf file and show all the fun stuff */ 1391/* scan an elf file and show all the fun stuff */
876#define prints(str) write(fileno(stdout), str, strlen(str)) 1392#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
877static int scanelf_elfobj(elfobj *elf) 1393static int scanelf_elfobj(elfobj *elf)
878{ 1394{
879 unsigned long i; 1395 unsigned long i;
880 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1396 char found_pax, found_phdr, found_relro, found_load, found_textrel,
881 found_rpath, found_needed, found_interp, found_bind, found_soname, 1397 found_rpath, found_needed, found_interp, found_bind, found_soname,
882 found_sym, found_lib, found_file, found_textrels; 1398 found_sym, found_lib, found_file, found_textrels, found_section;
883 static char *out_buffer = NULL; 1399 static char *out_buffer = NULL;
884 static size_t out_len; 1400 static size_t out_len;
885 1401
886 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1402 found_pax = found_phdr = found_relro = found_load = found_textrel = \
887 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1403 found_rpath = found_needed = found_interp = found_bind = found_soname = \
888 found_sym = found_lib = found_file = found_textrels = 0; 1404 found_sym = found_lib = found_file = found_textrels = found_section = 0;
889 1405
890 if (be_verbose > 2) 1406 if (be_verbose > 2)
891 printf("%s: scanning file {%s,%s}\n", elf->filename, 1407 printf("%s: scanning file {%s,%s}\n", elf->filename,
892 get_elfeitype(EI_CLASS, elf->elf_class), 1408 get_elfeitype(EI_CLASS, elf->elf_class),
893 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1409 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
895 printf("%s: scanning file\n", elf->filename); 1411 printf("%s: scanning file\n", elf->filename);
896 1412
897 /* init output buffer */ 1413 /* init output buffer */
898 if (!out_buffer) { 1414 if (!out_buffer) {
899 out_len = sizeof(char) * 80; 1415 out_len = sizeof(char) * 80;
900 out_buffer = (char*)xmalloc(out_len); 1416 out_buffer = xmalloc(out_len);
901 } 1417 }
902 *out_buffer = '\0'; 1418 *out_buffer = '\0';
903 1419
904 /* show the header */ 1420 /* show the header */
905 if (!be_quiet && show_banner) { 1421 if (!be_quiet && show_banner) {
906 for (i = 0; out_format[i]; ++i) { 1422 for (i = 0; out_format[i]; ++i) {
907 if (!IS_MODIFIER(out_format[i])) continue; 1423 if (!IS_MODIFIER(out_format[i])) continue;
908 1424
909 switch (out_format[++i]) { 1425 switch (out_format[++i]) {
1426 case '+': break;
910 case '%': break; 1427 case '%': break;
911 case '#': break; 1428 case '#': break;
912 case 'F': 1429 case 'F':
913 case 'p': 1430 case 'p':
914 case 'f': prints("FILE "); found_file = 1; break; 1431 case 'f': prints("FILE "); found_file = 1; break;
915 case 'o': prints(" TYPE "); break; 1432 case 'o': prints(" TYPE "); break;
916 case 'x': prints(" PAX "); break; 1433 case 'x': prints(" PAX "); break;
917 case 'e': prints("STK/REL/PTL "); break; 1434 case 'e': prints("STK/REL/PTL "); break;
918 case 't': prints("TEXTREL "); break; 1435 case 't': prints("TEXTREL "); break;
919 case 'r': prints("RPATH "); break; 1436 case 'r': prints("RPATH "); break;
1437 case 'M': prints("CLASS "); break;
1438 case 'l':
920 case 'n': prints("NEEDED "); break; 1439 case 'n': prints("NEEDED "); break;
921 case 'i': prints("INTERP "); break; 1440 case 'i': prints("INTERP "); break;
922 case 'b': prints("BIND "); break; 1441 case 'b': prints("BIND "); break;
1442 case 'Z': prints("SIZE "); break;
923 case 'S': prints("SONAME "); break; 1443 case 'S': prints("SONAME "); break;
924 case 's': prints("SYM "); break; 1444 case 's': prints("SYM "); break;
925 case 'N': prints("LIB "); break; 1445 case 'N': prints("LIB "); break;
926 case 'T': prints("TEXTRELS "); break; 1446 case 'T': prints("TEXTRELS "); break;
1447 case 'k': prints("SECTION "); break;
1448 case 'a': prints("ARCH "); break;
1449 case 'I': prints("OSABI "); break;
1450 case 'Y': prints("EABI "); break;
1451 case 'O': prints("PERM "); break;
1452 case 'D': prints("ENDIAN "); break;
927 default: warnf("'%c' has no title ?", out_format[i]); 1453 default: warnf("'%c' has no title ?", out_format[i]);
928 } 1454 }
929 } 1455 }
930 if (!found_file) prints("FILE "); 1456 if (!found_file) prints("FILE ");
931 prints("\n"); 1457 prints("\n");
935 1461
936 /* dump all the good stuff */ 1462 /* dump all the good stuff */
937 for (i = 0; out_format[i]; ++i) { 1463 for (i = 0; out_format[i]; ++i) {
938 const char *out; 1464 const char *out;
939 const char *tmp; 1465 const char *tmp;
940 1466 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])) { 1467 if (!IS_MODIFIER(out_format[i])) {
946 xchrcat(&out_buffer, out_format[i], &out_len); 1468 xchrcat(&out_buffer, out_format[i], &out_len);
947 continue; 1469 continue;
948 } 1470 }
949 1471
950 out = NULL; 1472 out = NULL;
951 be_wewy_wewy_quiet = (out_format[i] == '#'); 1473 be_wewy_wewy_quiet = (out_format[i] == '#');
1474 be_semi_verbose = (out_format[i] == '+');
952 switch (out_format[++i]) { 1475 switch (out_format[++i]) {
1476 case '+':
953 case '%': 1477 case '%':
954 case '#': 1478 case '#':
955 xchrcat(&out_buffer, out_format[i], &out_len); break; 1479 xchrcat(&out_buffer, out_format[i], &out_len); break;
956 case 'F': 1480 case 'F':
957 found_file = 1; 1481 found_file = 1;
983 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1507 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; 1508 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; 1509 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
986 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1510 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; 1511 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1512 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1513 case 'D': out = get_endian(elf); break;
1514 case 'O': out = strfileperms(elf->filename); break;
988 case 'n': 1515 case 'n':
989 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1516 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; 1517 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
991 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1518 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
992 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1519 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
993 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1520 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1521 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1522 case 'a': out = get_elfemtype(elf); break;
1523 case 'I': out = get_elfosabi(elf); break;
1524 case 'Y': out = get_elf_eabi(elf); break;
1525 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]); 1526 default: warnf("'%c' has no scan code?", out_format[i]);
995 } 1527 }
996 if (out) { 1528 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); 1529 xstrcat(&out_buffer, out, &out_len);
1002 }
1003 } 1530 }
1004 1531
1005#define FOUND_SOMETHING() \ 1532#define FOUND_SOMETHING() \
1006 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1533 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1007 found_rpath || found_needed || found_interp || found_bind || \ 1534 found_rpath || found_needed || found_interp || found_bind || \
1008 found_soname || found_sym || found_lib || found_textrels) 1535 found_soname || found_sym || found_lib || found_textrels || found_section )
1009 1536
1010 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1537 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1011 xchrcat(&out_buffer, ' ', &out_len); 1538 xchrcat(&out_buffer, ' ', &out_len);
1012 xstrcat(&out_buffer, elf->filename, &out_len); 1539 xstrcat(&out_buffer, elf->filename, &out_len);
1013 } 1540 }
1020} 1547}
1021 1548
1022/* scan a single elf */ 1549/* scan a single elf */
1023static int scanelf_elf(const char *filename, int fd, size_t len) 1550static int scanelf_elf(const char *filename, int fd, size_t len)
1024{ 1551{
1025 int ret; 1552 int ret = 1;
1553 size_t n;
1554 const char *match_etype;
1026 elfobj *elf; 1555 elfobj *elf;
1027 1556
1028 /* verify this is real ELF */ 1557 /* verify this is real ELF */
1029 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1558 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1030 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1559 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1031 return 1; 1560 return 2;
1032 }
1033
1034 if (strlen(match_etypes)) {
1035 char sbuf[126];
1036 strncpy(sbuf, match_etypes, sizeof(sbuf));
1037 if (strchr(match_etypes, ',') != NULL) {
1038 char *p;
1039 while((p = strrchr(sbuf, ',')) != NULL) {
1040 *p = 0;
1041 if (atoi(p+1) == get_etype(elf))
1042 goto label_ret;
1043 }
1044 } 1561 }
1045 if (atoi(sbuf) != get_etype(elf)) { 1562 switch (match_bits) {
1046 ret = 1; 1563 case 32:
1564 if (elf->elf_class != ELFCLASS32)
1047 goto label_done; 1565 goto label_done;
1566 break;
1567 case 64:
1568 if (elf->elf_class != ELFCLASS64)
1569 goto label_done;
1570 break;
1571 default: break;
1048 } 1572 }
1049 } 1573
1574 array_for_each(match_etypes, n, match_etype)
1575 if (etype_lookup(match_etype) == get_etype(elf))
1576 goto label_ret;
1577 if (array_cnt(match_etypes))
1578 goto label_done;
1050 1579
1051label_ret: 1580label_ret:
1052 ret = scanelf_elfobj(elf); 1581 ret = scanelf_elfobj(elf);
1053 1582
1054label_done: 1583label_done:
1066 1595
1067 ar = ar_open_fd(filename, fd); 1596 ar = ar_open_fd(filename, fd);
1068 if (ar == NULL) 1597 if (ar == NULL)
1069 return 1; 1598 return 1;
1070 1599
1071 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1600 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) { 1601 while ((m = ar_next(ar)) != NULL) {
1602 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1603 if (cur_pos == -1)
1604 errp("lseek() failed");
1073 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1605 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1074 if (elf) { 1606 if (elf) {
1075 scanelf_elfobj(elf); 1607 scanelf_elfobj(elf);
1076 unreadelf(elf); 1608 unreadelf(elf);
1077 } 1609 }
1078 } 1610 }
1079 munmap(ar_buffer, len); 1611 munmap(ar_buffer, len);
1080 1612
1081 return 0; 1613 return 0;
1082} 1614}
1083/* scan a file which may be an elf or an archive or some other magical beast */ 1615/* scan a file which may be an elf or an archive or some other magical beast */
1084static void scanelf_file(const char *filename) 1616static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1085{ 1617{
1618 const struct stat *st = st_cache;
1086 struct stat st; 1619 struct stat symlink_st;
1087 int fd; 1620 int fd;
1088 1621
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 */ 1622 /* always handle regular files and handle symlinked files if no -y */
1096 if (S_ISLNK(st.st_mode)) { 1623 if (S_ISLNK(st->st_mode)) {
1097 if (!scan_symlink) return; 1624 if (!scan_symlink)
1098 stat(filename, &st); 1625 return 1;
1626 fstatat(dir_fd, filename, &symlink_st, 0);
1627 st = &symlink_st;
1099 } 1628 }
1629
1100 if (!S_ISREG(st.st_mode)) { 1630 if (!S_ISREG(st->st_mode)) {
1101 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1631 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1102 return; 1632 return 1;
1103 } 1633 }
1104 1634
1105 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1635 if (match_perms) {
1636 if ((st->st_mode | match_perms) != st->st_mode)
1637 return 1;
1638 }
1639 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1640 if (fd == -1) {
1641 if (fix_elf && errno == ETXTBSY)
1642 warnp("%s: could not fix", filename);
1643 else if (be_verbose > 2)
1644 printf("%s: skipping file: %s\n", filename, strerror(errno));
1106 return; 1645 return 1;
1646 }
1107 1647
1108 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives) 1648 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1109 /* if it isn't an ELF, maybe it's an .a archive */ 1649 /* if it isn't an ELF, maybe it's an .a archive */
1650 if (scan_archives)
1110 scanelf_archive(filename, fd, st.st_size); 1651 scanelf_archive(filename, fd, st->st_size);
1111 1652
1653 /*
1654 * unreadelf() implicitly closes its fd, so only close it
1655 * when we are returning it in the non-ELF case
1656 */
1112 close(fd); 1657 close(fd);
1658 }
1659
1660 return 0;
1113} 1661}
1114 1662
1115/* scan a directory for ET_EXEC files and print when we find one */ 1663/* scan a directory for ET_EXEC files and print when we find one */
1116static void scanelf_dir(const char *path) 1664static int scanelf_dirat(int dir_fd, const char *path)
1117{ 1665{
1118 register DIR *dir; 1666 register DIR *dir;
1119 register struct dirent *dentry; 1667 register struct dirent *dentry;
1120 struct stat st_top, st; 1668 struct stat st_top, st;
1121 char buf[__PAX_UTILS_PATH_MAX]; 1669 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1122 size_t pathlen = 0, len = 0; 1670 size_t pathlen = 0, len = 0;
1671 int ret = 0;
1672 int subdir_fd;
1123 1673
1124 /* make sure path exists */ 1674 /* make sure path exists */
1125 if (lstat(path, &st_top) == -1) { 1675 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1126 if (be_verbose > 2) printf("%s: does not exist\n", path); 1676 if (be_verbose > 2) printf("%s: does not exist\n", path);
1127 return; 1677 return 1;
1128 } 1678 }
1129 1679
1130 /* ok, if it isn't a directory, assume we can open it */ 1680 /* ok, if it isn't a directory, assume we can open it */
1131 if (!S_ISDIR(st_top.st_mode)) { 1681 if (!S_ISDIR(st_top.st_mode))
1132 scanelf_file(path); 1682 return scanelf_fileat(dir_fd, path, &st_top);
1133 return;
1134 }
1135 1683
1136 /* now scan the dir looking for fun stuff */ 1684 /* now scan the dir looking for fun stuff */
1137 if ((dir = opendir(path)) == NULL) { 1685 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1138 warnf("could not opendir %s: %s", path, strerror(errno)); 1686 if (subdir_fd == -1)
1687 dir = NULL;
1688 else
1689 dir = fdopendir(subdir_fd);
1690 if (dir == NULL) {
1691 if (subdir_fd != -1)
1692 close(subdir_fd);
1693 else if (be_verbose > 2)
1694 printf("%s: skipping dir: %s\n", path, strerror(errno));
1139 return; 1695 return 1;
1140 } 1696 }
1141 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1697 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1142 1698
1143 pathlen = strlen(path); 1699 subpath = stpcpy(buf, path);
1700 if (subpath[-1] != '/')
1701 *subpath++ = '/';
1702 pathlen = subpath - buf;
1144 while ((dentry = readdir(dir))) { 1703 while ((dentry = readdir(dir))) {
1145 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1704 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1146 continue; 1705 continue;
1706
1707 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1708 continue;
1709
1147 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1710 len = strlen(dentry->d_name);
1148 if (len >= sizeof(buf)) { 1711 if (len + pathlen + 1 >= sizeof(buf)) {
1149 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1712 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1150 (unsigned long)len, (unsigned long)sizeof(buf)); 1713 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1151 continue; 1714 continue;
1152 } 1715 }
1153 sprintf(buf, "%s/%s", path, dentry->d_name); 1716 memcpy(subpath, dentry->d_name, len);
1154 if (lstat(buf, &st) != -1) { 1717 subpath[len] = '\0';
1718
1155 if (S_ISREG(st.st_mode)) 1719 if (S_ISREG(st.st_mode))
1156 scanelf_file(buf); 1720 ret = scanelf_fileat(dir_fd, buf, &st);
1157 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1721 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1158 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1722 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1159 scanelf_dir(buf); 1723 ret = scanelf_dirat(dir_fd, buf);
1160 }
1161 } 1724 }
1162 } 1725 }
1163 closedir(dir); 1726 closedir(dir);
1164}
1165 1727
1728 return ret;
1729}
1730static int scanelf_dir(const char *path)
1731{
1732 return scanelf_dirat(root_fd, root_rel_path(path));
1733}
1734
1166static int scanelf_from_file(char *filename) 1735static int scanelf_from_file(const char *filename)
1167{ 1736{
1168 FILE *fp = NULL; 1737 FILE *fp;
1169 char *p; 1738 char *p, *path;
1170 char path[__PAX_UTILS_PATH_MAX]; 1739 size_t len;
1740 int ret;
1171 1741
1172 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1742 if (strcmp(filename, "-") == 0)
1173 fp = stdin; 1743 fp = stdin;
1174 else if ((fp = fopen(filename, "r")) == NULL) 1744 else if ((fp = fopen(filename, "r")) == NULL)
1175 return 1; 1745 return 1;
1176 1746
1177 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1747 path = NULL;
1748 len = 0;
1749 ret = 0;
1750 while (getline(&path, &len, fp) != -1) {
1178 if ((p = strchr(path, '\n')) != NULL) 1751 if ((p = strchr(path, '\n')) != NULL)
1179 *p = 0; 1752 *p = 0;
1180 search_path = path; 1753 search_path = path;
1181 scanelf_dir(path); 1754 ret = scanelf_dir(path);
1182 } 1755 }
1756 free(path);
1757
1183 if (fp != stdin) 1758 if (fp != stdin)
1184 fclose(fp); 1759 fclose(fp);
1760
1185 return 0; 1761 return ret;
1186} 1762}
1187 1763
1188static void load_ld_so_conf() 1764#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1765
1766static int _load_ld_cache_config(const char *fname)
1189{ 1767{
1190 FILE *fp = NULL; 1768 FILE *fp = NULL;
1191 char *p; 1769 char *p, *path;
1192 char path[__PAX_UTILS_PATH_MAX]; 1770 size_t len;
1193 int i = 0; 1771 int curr_fd = -1;
1194 1772
1195 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1773 fp = fopenat_r(root_fd, root_rel_path(fname));
1774 if (fp == NULL)
1196 return; 1775 return -1;
1197 1776
1198 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1777 path = NULL;
1199 if (*path != '/') 1778 len = 0;
1200 continue; 1779 while (getline(&path, &len, fp) != -1) {
1201
1202 if ((p = strrchr(path, '\r')) != NULL) 1780 if ((p = strrchr(path, '\r')) != NULL)
1203 *p = 0; 1781 *p = 0;
1204 if ((p = strchr(path, '\n')) != NULL) 1782 if ((p = strchr(path, '\n')) != NULL)
1205 *p = 0; 1783 *p = 0;
1206 1784
1207 ldpaths[i++] = xstrdup(path); 1785 /* recursive includes of the same file will make this segfault. */
1786 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1787 glob_t gl;
1788 size_t x;
1789 const char *gpath;
1208 1790
1209 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1791 /* re-use existing path buffer ... need to be creative */
1210 break; 1792 if (path[8] != '/')
1793 gpath = memcpy(path + 3, "/etc/", 5);
1794 else
1795 gpath = path + 8;
1796 if (root_fd != AT_FDCWD) {
1797 if (curr_fd == -1) {
1798 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1799 if (fchdir(root_fd))
1800 errp("unable to change to root dir");
1801 }
1802 gpath = root_rel_path(gpath);
1803 }
1804
1805 if (glob(gpath, 0, NULL, &gl) == 0) {
1806 for (x = 0; x < gl.gl_pathc; ++x) {
1807 /* try to avoid direct loops */
1808 if (strcmp(gl.gl_pathv[x], fname) == 0)
1809 continue;
1810 _load_ld_cache_config(gl.gl_pathv[x]);
1811 }
1812 globfree(&gl);
1813 }
1814
1815 /* failed globs are ignored by glibc */
1816 continue;
1211 } 1817 }
1212 ldpaths[i] = NULL; 1818
1819 if (*path != '/')
1820 continue;
1821
1822 xarraypush_str(ldpaths, path);
1823 }
1824 free(path);
1213 1825
1214 fclose(fp); 1826 fclose(fp);
1827
1828 if (curr_fd != -1) {
1829 if (fchdir(curr_fd))
1830 {/* don't care */}
1831 close(curr_fd);
1832 }
1833
1834 return 0;
1835}
1836
1837#elif defined(__FreeBSD__) || defined(__DragonFly__)
1838
1839static int _load_ld_cache_config(const char *fname)
1840{
1841 FILE *fp = NULL;
1842 char *b = NULL, *p;
1843 struct elfhints_hdr hdr;
1844
1845 fp = fopenat_r(root_fd, root_rel_path(fname));
1846 if (fp == NULL)
1847 return -1;
1848
1849 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1850 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1851 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1852 {
1853 fclose(fp);
1854 return -1;
1855 }
1856
1857 b = xmalloc(hdr.dirlistlen + 1);
1858 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1859 fclose(fp);
1860 free(b);
1861 return -1;
1862 }
1863
1864 while ((p = strsep(&b, ":"))) {
1865 if (*p == '\0')
1866 continue;
1867 xarraypush_str(ldpaths, p);
1868 }
1869
1870 free(b);
1871 fclose(fp);
1872 return 0;
1873}
1874
1875#else
1876#ifdef __ELF__
1877#warning Cache config support not implemented for your target
1878#endif
1879static int _load_ld_cache_config(const char *fname)
1880{
1881 return 0;
1882}
1883#endif
1884
1885static void load_ld_cache_config(const char *fname)
1886{
1887 bool scan_l, scan_ul, scan_ull;
1888 size_t n;
1889 const char *ldpath;
1890
1891 _load_ld_cache_config(fname);
1892
1893 scan_l = scan_ul = scan_ull = false;
1894 array_for_each(ldpaths, n, ldpath) {
1895 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1896 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1897 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1898 }
1899
1900 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1901 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1902 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1215} 1903}
1216 1904
1217/* scan /etc/ld.so.conf for paths */ 1905/* scan /etc/ld.so.conf for paths */
1218static void scanelf_ldpath() 1906static void scanelf_ldpath(void)
1219{ 1907{
1220 char scan_l, scan_ul, scan_ull; 1908 size_t n;
1221 int i = 0; 1909 const char *ldpath;
1222 1910
1223 if (!ldpaths[0]) 1911 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]); 1912 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} 1913}
1240 1914
1241/* scan env PATH for paths */ 1915/* scan env PATH for paths */
1242static void scanelf_envpath() 1916static void scanelf_envpath(void)
1243{ 1917{
1244 char *path, *p; 1918 char *path, *p;
1245 1919
1246 path = getenv("PATH"); 1920 path = getenv("PATH");
1247 if (!path) 1921 if (!path)
1254 } 1928 }
1255 1929
1256 free(path); 1930 free(path);
1257} 1931}
1258 1932
1259 1933/* 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" 1934#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1262#define a_argument required_argument 1935#define a_argument required_argument
1263static struct option const long_opts[] = { 1936static struct option const long_opts[] = {
1264 {"path", no_argument, NULL, 'p'}, 1937 {"path", no_argument, NULL, 'p'},
1265 {"ldpath", no_argument, NULL, 'l'}, 1938 {"ldpath", no_argument, NULL, 'l'},
1939 {"use-ldpath",no_argument, NULL, 129},
1940 {"root", a_argument, NULL, 128},
1266 {"recursive", no_argument, NULL, 'R'}, 1941 {"recursive", no_argument, NULL, 'R'},
1267 {"mount", no_argument, NULL, 'm'}, 1942 {"mount", no_argument, NULL, 'm'},
1268 {"symlink", no_argument, NULL, 'y'}, 1943 {"symlink", no_argument, NULL, 'y'},
1269 {"archives", no_argument, NULL, 'A'}, 1944 {"archives", no_argument, NULL, 'A'},
1270 {"ldcache", no_argument, NULL, 'L'}, 1945 {"ldcache", no_argument, NULL, 'L'},
1271 {"fix", no_argument, NULL, 'X'}, 1946 {"fix", no_argument, NULL, 'X'},
1947 {"setpax", a_argument, NULL, 'z'},
1272 {"pax", no_argument, NULL, 'x'}, 1948 {"pax", no_argument, NULL, 'x'},
1273 {"header", no_argument, NULL, 'e'}, 1949 {"header", no_argument, NULL, 'e'},
1274 {"textrel", no_argument, NULL, 't'}, 1950 {"textrel", no_argument, NULL, 't'},
1275 {"rpath", no_argument, NULL, 'r'}, 1951 {"rpath", no_argument, NULL, 'r'},
1276 {"needed", no_argument, NULL, 'n'}, 1952 {"needed", no_argument, NULL, 'n'},
1277 {"interp", no_argument, NULL, 'i'}, 1953 {"interp", no_argument, NULL, 'i'},
1278 {"bind", no_argument, NULL, 'b'}, 1954 {"bind", no_argument, NULL, 'b'},
1279 {"soname", no_argument, NULL, 'S'}, 1955 {"soname", no_argument, NULL, 'S'},
1280 {"symbol", a_argument, NULL, 's'}, 1956 {"symbol", a_argument, NULL, 's'},
1957 {"section", a_argument, NULL, 'k'},
1281 {"lib", a_argument, NULL, 'N'}, 1958 {"lib", a_argument, NULL, 'N'},
1282 {"gmatch", no_argument, NULL, 'g'}, 1959 {"gmatch", no_argument, NULL, 'g'},
1283 {"textrels", no_argument, NULL, 'T'}, 1960 {"textrels", no_argument, NULL, 'T'},
1284 {"etype", a_argument, NULL, 'E'}, 1961 {"etype", a_argument, NULL, 'E'},
1962 {"bits", a_argument, NULL, 'M'},
1963 {"endian", no_argument, NULL, 'D'},
1964 {"osabi", no_argument, NULL, 'I'},
1965 {"eabi", no_argument, NULL, 'Y'},
1966 {"perms", a_argument, NULL, 'O'},
1967 {"size", no_argument, NULL, 'Z'},
1285 {"all", no_argument, NULL, 'a'}, 1968 {"all", no_argument, NULL, 'a'},
1286 {"quiet", no_argument, NULL, 'q'}, 1969 {"quiet", no_argument, NULL, 'q'},
1287 {"verbose", no_argument, NULL, 'v'}, 1970 {"verbose", no_argument, NULL, 'v'},
1288 {"format", a_argument, NULL, 'F'}, 1971 {"format", a_argument, NULL, 'F'},
1289 {"from", a_argument, NULL, 'f'}, 1972 {"from", a_argument, NULL, 'f'},
1290 {"file", a_argument, NULL, 'o'}, 1973 {"file", a_argument, NULL, 'o'},
1974 {"nocolor", no_argument, NULL, 'C'},
1291 {"nobanner", no_argument, NULL, 'B'}, 1975 {"nobanner", no_argument, NULL, 'B'},
1292 {"help", no_argument, NULL, 'h'}, 1976 {"help", no_argument, NULL, 'h'},
1293 {"version", no_argument, NULL, 'V'}, 1977 {"version", no_argument, NULL, 'V'},
1294 {NULL, no_argument, NULL, 0x0} 1978 {NULL, no_argument, NULL, 0x0}
1295}; 1979};
1296 1980
1297static const char *opts_help[] = { 1981static const char * const opts_help[] = {
1298 "Scan all directories in PATH environment", 1982 "Scan all directories in PATH environment",
1299 "Scan all directories in /etc/ld.so.conf", 1983 "Scan all directories in /etc/ld.so.conf",
1984 "Use ld.so.conf to show full path (use with -r/-n)",
1985 "Root directory (use with -l or -p)",
1300 "Scan directories recursively", 1986 "Scan directories recursively",
1301 "Don't recursively cross mount points", 1987 "Don't recursively cross mount points",
1302 "Don't scan symlinks", 1988 "Don't scan symlinks",
1303 "Scan archives (.a files)", 1989 "Scan archives (.a files)",
1304 "Utilize ld.so.cache information (use with -r/-n)", 1990 "Utilize ld.so.cache to show full path (use with -r/-n)",
1305 "Try and 'fix' bad things (use with -r/-e)\n", 1991 "Try and 'fix' bad things (use with -r/-e)",
1992 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1306 "Print PaX markings", 1993 "Print PaX markings",
1307 "Print GNU_STACK/PT_LOAD markings", 1994 "Print GNU_STACK/PT_LOAD markings",
1308 "Print TEXTREL information", 1995 "Print TEXTREL information",
1309 "Print RPATH information", 1996 "Print RPATH information",
1310 "Print NEEDED information", 1997 "Print NEEDED information",
1311 "Print INTERP information", 1998 "Print INTERP information",
1312 "Print BIND information", 1999 "Print BIND information",
1313 "Print SONAME information", 2000 "Print SONAME information",
1314 "Find a specified symbol", 2001 "Find a specified symbol",
2002 "Find a specified section",
1315 "Find a specified library", 2003 "Find a specified library",
1316 "Use strncmp to match libraries. (use with -N)", 2004 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1317 "Locate cause of TEXTREL", 2005 "Locate cause of TEXTREL",
2006 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1318 "Print only ELF files matching numeric constant", 2007 "Print only ELF files matching numeric bits",
1319 "Print all scanned info (-x -e -t -r -b)\n", 2008 "Print Endianness",
2009 "Print OSABI",
2010 "Print EABI (EM_ARM Only)",
2011 "Print only ELF files matching octal permissions",
2012 "Print ELF file size",
2013 "Print all useful/simple info\n",
1320 "Only output 'bad' things", 2014 "Only output 'bad' things",
1321 "Be verbose (can be specified more than once)", 2015 "Be verbose (can be specified more than once)",
1322 "Use specified format for output", 2016 "Use specified format for output",
1323 "Read input stream from a filename", 2017 "Read input stream from a filename",
1324 "Write output stream to a filename", 2018 "Write output stream to a filename",
2019 "Don't emit color in output",
1325 "Don't display the header", 2020 "Don't display the header",
1326 "Print this help and exit", 2021 "Print this help and exit",
1327 "Print version and exit", 2022 "Print version and exit",
1328 NULL 2023 NULL
1329}; 2024};
1330 2025
1331/* display usage and exit */ 2026/* display usage and exit */
1332static void usage(int status) 2027static void usage(int status)
1333{ 2028{
1334 unsigned long i; 2029 const char a_arg[] = "<arg>";
2030 size_t a_arg_len = strlen(a_arg) + 2;
2031 size_t i;
2032 int optlen;
1335 printf("* Scan ELF binaries for stuff\n\n" 2033 printf("* Scan ELF binaries for stuff\n\n"
1336 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 2034 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1337 printf("Options: -[%s]\n", PARSE_FLAGS); 2035 printf("Options: -[%s]\n", PARSE_FLAGS);
2036
2037 /* prescan the --long opt length to auto-align */
2038 optlen = 0;
1338 for (i = 0; long_opts[i].name; ++i) 2039 for (i = 0; long_opts[i].name; ++i) {
2040 int l = strlen(long_opts[i].name);
2041 if (long_opts[i].has_arg == a_argument)
2042 l += a_arg_len;
2043 optlen = max(l, optlen);
2044 }
2045
2046 for (i = 0; long_opts[i].name; ++i) {
2047 /* first output the short flag if it has one */
2048 if (long_opts[i].val > '~')
2049 printf(" ");
2050 else
2051 printf(" -%c, ", long_opts[i].val);
2052
2053 /* then the long flag */
1339 if (long_opts[i].has_arg == no_argument) 2054 if (long_opts[i].has_arg == no_argument)
1340 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 2055 printf("--%-*s", optlen, long_opts[i].name);
1341 long_opts[i].name, opts_help[i]);
1342 else 2056 else
1343 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 2057 printf("--%s %s %*s", long_opts[i].name, a_arg,
1344 long_opts[i].name, opts_help[i]); 2058 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
1345 2059
1346 if (status != EXIT_SUCCESS) 2060 /* finally the help text */
1347 exit(status); 2061 printf("* %s\n", opts_help[i]);
2062 }
1348 2063
1349 puts("\nThe format modifiers for the -F option are:"); 2064 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); 2065 exit(status);
1360} 2066}
1361 2067
1362/* parse command line arguments and preform needed actions */ 2068/* parse command line arguments and preform needed actions */
2069#define do_pax_state(option, flag) \
2070 if (islower(option)) { \
2071 flags &= ~PF_##flag; \
2072 flags |= PF_NO##flag; \
2073 } else { \
2074 flags &= ~PF_NO##flag; \
2075 flags |= PF_##flag; \
2076 }
2077static void parse_delimited(array_t *arr, char *arg, const char *delim)
2078{
2079 char *ele = strtok(arg, delim);
2080 if (!ele) /* edge case: -s '' */
2081 xarraypush_str(arr, "");
2082 while (ele) {
2083 xarraypush_str(arr, ele);
2084 ele = strtok(NULL, delim);
2085 }
2086}
1363static void parseargs(int argc, char *argv[]) 2087static int parseargs(int argc, char *argv[])
1364{ 2088{
1365 int i; 2089 int i;
1366 char *from_file = NULL; 2090 const char *from_file = NULL;
2091 int ret = 0;
2092 char load_cache_config = 0;
1367 2093
1368 opterr = 0; 2094 opterr = 0;
1369 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2095 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1370 switch (i) { 2096 switch (i) {
1371 2097
1379 case 'f': 2105 case 'f':
1380 if (from_file) warn("You prob don't want to specify -f twice"); 2106 if (from_file) warn("You prob don't want to specify -f twice");
1381 from_file = optarg; 2107 from_file = optarg;
1382 break; 2108 break;
1383 case 'E': 2109 case 'E':
1384 strncpy(match_etypes, optarg, sizeof(match_etypes)); 2110 /* historically, this was comma delimited */
2111 parse_delimited(match_etypes, optarg, ",");
2112 break;
2113 case 'M':
2114 match_bits = atoi(optarg);
2115 if (match_bits == 0) {
2116 if (strcmp(optarg, "ELFCLASS32") == 0)
2117 match_bits = 32;
2118 if (strcmp(optarg, "ELFCLASS64") == 0)
2119 match_bits = 64;
2120 }
2121 break;
2122 case 'O':
2123 if (sscanf(optarg, "%o", &match_perms) == -1)
2124 match_bits = 0;
1385 break; 2125 break;
1386 case 'o': { 2126 case 'o': {
1387 FILE *fp = NULL;
1388 if ((fp = freopen(optarg, "w", stdout)) == NULL) 2127 if (freopen(optarg, "w", stdout) == NULL)
1389 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2128 errp("Could not freopen(%s)", optarg);
1390 SET_STDOUT(fp);
1391 break; 2129 break;
1392 } 2130 }
1393
1394 case 's': { 2131 case 'k':
1395 if (find_sym) warn("You prob don't want to specify -s twice"); 2132 xarraypush_str(find_section_arr, optarg);
1396 find_sym = optarg;
1397 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1398 sprintf(versioned_symname, "%s@", find_sym);
1399 break; 2133 break;
1400 }
1401 case 'N': { 2134 case 's':
1402 if (find_lib) warn("You prob don't want to specify -N twice"); 2135 /* historically, this was comma delimited */
1403 find_lib = optarg; 2136 parse_delimited(find_sym_arr, optarg, ",");
1404 break; 2137 break;
1405 } 2138 case 'N':
1406 2139 xarraypush_str(find_lib_arr, optarg);
2140 break;
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 find_sym = array_flatten_str(find_sym_arr);
2268 find_lib = array_flatten_str(find_lib_arr);
2269 find_section = array_flatten_str(find_section_arr);
1445 /* let the format option override all other options */ 2270 /* let the format option override all other options */
1446 if (out_format) { 2271 if (out_format) {
1447 show_pax = show_phdr = show_textrel = show_rpath = \ 2272 show_pax = show_phdr = show_textrel = show_rpath = \
1448 show_needed = show_interp = show_bind = show_soname = \ 2273 show_needed = show_interp = show_bind = show_soname = \
1449 show_textrels = 0; 2274 show_textrels = show_perms = show_endian = show_size = \
2275 show_osabi = show_eabi = 0;
1450 for (i = 0; out_format[i]; ++i) { 2276 for (i = 0; out_format[i]; ++i) {
1451 if (!IS_MODIFIER(out_format[i])) continue; 2277 if (!IS_MODIFIER(out_format[i])) continue;
1452 2278
1453 switch (out_format[++i]) { 2279 switch (out_format[++i]) {
2280 case '+': break;
1454 case '%': break; 2281 case '%': break;
1455 case '#': break; 2282 case '#': break;
1456 case 'F': break; 2283 case 'F': break;
1457 case 'p': break; 2284 case 'p': break;
1458 case 'f': break; 2285 case 'f': break;
2286 case 'k': break;
1459 case 's': break; 2287 case 's': break;
1460 case 'N': break; 2288 case 'N': break;
1461 case 'o': break; 2289 case 'o': break;
2290 case 'a': break;
2291 case 'M': break;
2292 case 'Z': show_size = 1; break;
2293 case 'D': show_endian = 1; break;
2294 case 'I': show_osabi = 1; break;
2295 case 'Y': show_eabi = 1; break;
2296 case 'O': show_perms = 1; break;
1462 case 'x': show_pax = 1; break; 2297 case 'x': show_pax = 1; break;
1463 case 'e': show_phdr = 1; break; 2298 case 'e': show_phdr = 1; break;
1464 case 't': show_textrel = 1; break; 2299 case 't': show_textrel = 1; break;
1465 case 'r': show_rpath = 1; break; 2300 case 'r': show_rpath = 1; break;
1466 case 'n': show_needed = 1; break; 2301 case 'n': show_needed = 1; break;
1467 case 'i': show_interp = 1; break; 2302 case 'i': show_interp = 1; break;
1468 case 'b': show_bind = 1; break; 2303 case 'b': show_bind = 1; break;
1469 case 'S': show_soname = 1; break; 2304 case 'S': show_soname = 1; break;
1470 case 'T': show_textrels = 1; break; 2305 case 'T': show_textrels = 1; break;
1471 default: 2306 default:
1472 err("Invalid format specifier '%c' (byte %i)", 2307 err("invalid format specifier '%c' (byte %i)",
1473 out_format[i], i+1); 2308 out_format[i], i+1);
1474 } 2309 }
1475 } 2310 }
1476 2311
1477 /* construct our default format */ 2312 /* construct our default format */
1478 } else { 2313 } else {
1479 size_t fmt_len = 30; 2314 size_t fmt_len = 30;
1480 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2315 out_format = xmalloc(sizeof(char) * fmt_len);
2316 *out_format = '\0';
1481 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2317 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1482 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2318 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2319 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2320 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2321 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2322 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2323 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1483 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2324 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1484 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2325 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1485 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2326 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1486 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2327 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1487 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2328 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1488 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2329 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1489 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2330 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1490 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2331 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1491 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2332 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2333 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1492 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2334 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1493 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2335 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1494 } 2336 }
1495 if (be_verbose > 2) printf("Format: %s\n", out_format); 2337 if (be_verbose > 2) printf("Format: %s\n", out_format);
1496 2338
1497 /* now lets actually do the scanning */ 2339 /* now lets actually do the scanning */
1498 if (scan_ldpath || use_ldcache) 2340 if (load_cache_config)
1499 load_ld_so_conf(); 2341 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1500 if (scan_ldpath) scanelf_ldpath(); 2342 if (scan_ldpath) scanelf_ldpath();
1501 if (scan_envpath) scanelf_envpath(); 2343 if (scan_envpath) scanelf_envpath();
2344 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2345 from_file = "-";
1502 if (from_file) { 2346 if (from_file) {
1503 scanelf_from_file(from_file); 2347 scanelf_from_file(from_file);
1504 from_file = *argv; 2348 from_file = *argv;
1505 } 2349 }
1506 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2350 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1507 err("Nothing to scan !?"); 2351 err("Nothing to scan !?");
1508 while (optind < argc) { 2352 while (optind < argc) {
1509 search_path = argv[optind++]; 2353 search_path = argv[optind++];
1510 scanelf_dir(search_path); 2354 ret = scanelf_dir(search_path);
1511 } 2355 }
1512 2356
2357#ifdef __PAX_UTILS_CLEANUP
1513 /* clean up */ 2358 /* clean up */
1514 if (versioned_symname) free(versioned_symname);
1515 for (i = 0; ldpaths[i]; ++i)
1516 free(ldpaths[i]); 2359 xarrayfree(ldpaths);
2360 xarrayfree(find_sym_arr);
2361 xarrayfree(find_lib_arr);
2362 xarrayfree(find_section_arr);
2363 free(find_sym);
2364 free(find_lib);
2365 free(find_section);
2366 {
2367 size_t n;
2368 regex_t *preg;
2369 array_for_each(find_sym_regex_arr, n, preg)
2370 regfree(preg);
2371 xarrayfree(find_sym_regex_arr);
2372 }
1517 2373
1518 if (ldcache != 0) 2374 if (ldcache != 0)
1519 munmap(ldcache, ldcache_size); 2375 munmap(ldcache, ldcache_size);
1520} 2376#endif
1521 2377
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; 2378 return ret;
1530} 2379}
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 2380
1541 new_len = strlen(*dst) + strlen(src); 2381static 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{ 2382{
1556 static char my_app[2]; 2383 const char *delims = " \t\n";
1557 my_app[0] = append; 2384 char **envvals = NULL;
1558 my_app[1] = '\0'; 2385 char *env, *s;
1559 xstrcat(dst, my_app, curr_len); 2386 int nentry;
1560}
1561 2387
2388 if ((env = getenv(envvar)) == NULL)
2389 return NULL;
1562 2390
2391 env = xstrdup(env);
2392 if (env == NULL)
2393 return NULL;
2394
2395 s = strtok(env, delims);
2396 if (s == NULL) {
2397 free(env);
2398 return NULL;
2399 }
2400
2401 nentry = 0;
2402 while (s != NULL) {
2403 ++nentry;
2404 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2405 envvals[nentry-1] = s;
2406 s = strtok(NULL, delims);
2407 }
2408 envvals[nentry] = NULL;
2409
2410 /* don't want to free(env) as it contains the memory that backs
2411 * the envvals array of strings */
2412 return envvals;
2413}
2414
2415static void parseenv(void)
2416{
2417 color_init(false);
2418 qa_textrels = get_split_env("QA_TEXTRELS");
2419 qa_execstack = get_split_env("QA_EXECSTACK");
2420 qa_wx_load = get_split_env("QA_WX_LOAD");
2421}
2422
2423#ifdef __PAX_UTILS_CLEANUP
2424static void cleanup(void)
2425{
2426 free(out_format);
2427 free(qa_textrels);
2428 free(qa_execstack);
2429 free(qa_wx_load);
2430}
2431#endif
1563 2432
1564int main(int argc, char *argv[]) 2433int main(int argc, char *argv[])
1565{ 2434{
2435 int ret;
1566 if (argc < 2) 2436 if (argc < 2)
1567 usage(EXIT_FAILURE); 2437 usage(EXIT_FAILURE);
2438 parseenv();
1568 parseargs(argc, argv); 2439 ret = parseargs(argc, argv);
1569 fclose(stdout); 2440 fclose(stdout);
1570#ifdef __BOUNDS_CHECKING_ON 2441#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()"); 2442 cleanup();
2443 warn("The calls to add/delete heap should be off:\n"
2444 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2445 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1572#endif 2446#endif
1573 return EXIT_SUCCESS; 2447 return ret;
1574} 2448}
2449
2450/* Match filename against entries in matchlist, return TRUE
2451 * if the file is listed */
2452static int file_matches_list(const char *filename, char **matchlist)
2453{
2454 char **file;
2455 char *match;
2456 char buf[__PAX_UTILS_PATH_MAX];
2457
2458 if (matchlist == NULL)
2459 return 0;
2460
2461 for (file = matchlist; *file != NULL; file++) {
2462 if (search_path) {
2463 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2464 match = buf;
2465 } else {
2466 match = *file;
2467 }
2468 if (fnmatch(match, filename, 0) == 0)
2469 return 1;
2470 }
2471 return 0;
2472}

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