/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.185 Revision 1.256
1/* 1/*
2 * Copyright 2003-2007 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 1.185 2007/08/18 04:59:32 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.256 2013/04/08 06:38:42 vapier Exp $
5 * 5 *
6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2012 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2007 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 1.256 2013/04/08 06:38:42 vapier Exp $";
11const char argv0[] = "scanelf";
12
10#include "paxinc.h" 13#include "paxinc.h"
11
12static const char *rcsid = "$Id: scanelf.c,v 1.185 2007/08/18 04:59:32 vapier Exp $";
13#define argv0 "scanelf"
14 14
15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16 16
17/* prototypes */ 17/* prototypes */
18static int file_matches_list(const char *filename, char **matchlist); 18static int file_matches_list(const char *filename, char **matchlist);
19static int scanelf_elfobj(elfobj *elf);
20static int scanelf_elf(const char *filename, int fd, size_t len);
21static int scanelf_archive(const char *filename, int fd, size_t len);
22static int scanelf_file(const char *filename, const struct stat *st_cache);
23static int scanelf_dir(const char *path);
24static void scanelf_ldpath(void);
25static void scanelf_envpath(void);
26static void usage(int status);
27static char **get_split_env(const char *envvar);
28static void parseenv(void);
29static int parseargs(int argc, char *argv[]);
30static char *xstrdup(const char *s);
31static void *xmalloc(size_t size);
32static void *xrealloc(void *ptr, size_t size);
33static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
34#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
35static inline void xchrcat(char **dst, const char append, size_t *curr_len);
36static int rematch(const char *regex, const char *match, int cflags);
37 19
38/* variables to control behavior */ 20/* variables to control behavior */
39static char match_etypes[126] = ""; 21static char *match_etypes = NULL;
40static char *ldpaths[256]; 22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
41static char scan_ldpath = 0; 23static char scan_ldpath = 0;
42static char scan_envpath = 0; 24static char scan_envpath = 0;
43static char scan_symlink = 1; 25static char scan_symlink = 1;
44static char scan_archives = 0; 26static char scan_archives = 0;
45static char dir_recurse = 0; 27static char dir_recurse = 0;
46static char dir_crossmount = 1; 28static char dir_crossmount = 1;
47static char show_pax = 0; 29static char show_pax = 0;
48static char show_perms = 0; 30static char show_perms = 0;
31static char show_size = 0;
49static char show_phdr = 0; 32static char show_phdr = 0;
50static char show_textrel = 0; 33static char show_textrel = 0;
51static char show_rpath = 0; 34static char show_rpath = 0;
52static char show_needed = 0; 35static char show_needed = 0;
53static char show_interp = 0; 36static char show_interp = 0;
54static char show_bind = 0; 37static char show_bind = 0;
55static char show_soname = 0; 38static char show_soname = 0;
56static char show_textrels = 0; 39static char show_textrels = 0;
57static char show_banner = 1; 40static char show_banner = 1;
58static char show_endian = 0; 41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
59static char be_quiet = 0; 44static char be_quiet = 0;
60static char be_verbose = 0; 45static char be_verbose = 0;
61static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
62static char be_semi_verbose = 0; 47static char be_semi_verbose = 0;
63static char *find_sym = NULL, *versioned_symname = NULL; 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;
64static char *find_lib = NULL; 51static char *find_lib = NULL;
52static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
65static char *find_section = NULL; 53static char *find_section = NULL;
54static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
66static char *out_format = NULL; 55static char *out_format = NULL;
67static char *search_path = NULL; 56static char *search_path = NULL;
68static char fix_elf = 0; 57static char fix_elf = 0;
69static char g_match = 0; 58static char g_match = 0;
70static char use_ldcache = 0; 59static char use_ldcache = 0;
60static char use_ldpath = 0;
71 61
72static char **qa_textrels = NULL; 62static char **qa_textrels = NULL;
73static char **qa_execstack = NULL; 63static char **qa_execstack = NULL;
74static char **qa_wx_load = NULL; 64static char **qa_wx_load = NULL;
65static int root_fd = AT_FDCWD;
75 66
76int match_bits = 0; 67static int match_bits = 0;
77unsigned int match_perms = 0; 68static unsigned int match_perms = 0;
78caddr_t ldcache = 0; 69static void *ldcache = NULL;
79size_t ldcache_size = 0; 70static size_t ldcache_size = 0;
80unsigned long setpax = 0UL; 71static unsigned long setpax = 0UL;
81 72
82int has_objdump = 0; 73static int has_objdump = 0;
83
84static char *getstr_perms(const char *fname);
85static char *getstr_perms(const char *fname) {
86 struct stat st;
87 static char buf[8];
88
89 if ((stat(fname, &st)) == (-1))
90 return (char *) "";
91
92 snprintf(buf, sizeof(buf), "%o", st.st_mode);
93
94 return (char *) buf + 2;
95}
96 74
97/* find the path to a file by name */ 75/* find the path to a file by name */
98static char *which(const char *fname) 76static int bin_in_path(const char *fname)
99{ 77{
100 static char fullpath[BUFSIZ]; 78 char fullpath[__PAX_UTILS_PATH_MAX];
101 char *path, *p; 79 char *path, *p;
102 80
103 path = getenv("PATH"); 81 path = getenv("PATH");
104 if (!path) 82 if (!path)
105 return NULL; 83 return 0;
106 84
107 path = xstrdup(path);
108 while ((p = strrchr(path, ':')) != NULL) { 85 while ((p = strrchr(path, ':')) != NULL) {
109 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname); 86 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
110 *p = 0; 87 *p = 0;
111 if (access(fullpath, R_OK) != (-1)) { 88 if (access(fullpath, R_OK) != -1)
112 free(path); 89 return 1;
113 return (char *) fullpath;
114 } 90 }
115 } 91
116 free(path); 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)
117 return NULL; 99 return NULL;
100 return fdopen(fd, "re");
118} 101}
119 102
120/* 1 on failure. 0 otherwise */ 103static const char *root_rel_path(const char *path)
121static int rematch(const char *regex, const char *match, int cflags)
122{ 104{
123 regex_t preg; 105 /*
124 int ret; 106 * openat() will ignore the dirfd if path starts with
125 107 * a /, so consume all of that noise
126 if ((match == NULL) || (regex == NULL)) 108 *
127 return EXIT_FAILURE; 109 * XXX: we don't handle relative paths like ../ that
128 110 * break out of the --root option, but for now, just
129 111 * don't do that :P.
130 if ((ret = regcomp(&preg, regex, cflags))) { 112 */
131 char err[256]; 113 if (root_fd != AT_FDCWD) {
132 114 while (*path == '/')
133 if (regerror(ret, &preg, err, sizeof(err))) 115 ++path;
134 fprintf(stderr, "regcomp failed: %s", err); 116 if (*path == '\0')
135 else 117 path = ".";
136 fprintf(stderr, "regcomp failed");
137
138 return EXIT_FAILURE;
139 } 118 }
140 ret = regexec(&preg, match, 0, NULL, 0);
141 regfree(&preg);
142 119
143 return ret; 120 return path;
144} 121}
145 122
146/* sub-funcs for scanelf_file() */ 123/* sub-funcs for scanelf_fileat() */
147static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 124static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
148{ 125{
149 /* 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 */
150#define GET_SYMTABS(B) \ 141#define GET_SYMTABS(B) \
151 if (elf->elf_class == ELFCLASS ## B) { \ 142 if (elf->elf_class == ELFCLASS ## B) { \
152 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ 143 Elf ## B ## _Shdr *esymtab = symtab; \
153 /* debug sections */ \ 144 Elf ## B ## _Shdr *estrtab = strtab; \
154 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ 145 Elf ## B ## _Shdr *edynsym = dynsym; \
155 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ 146 Elf ## B ## _Shdr *edynstr = dynstr; \
156 /* runtime sections */ \ 147 \
157 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ 148 if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
158 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ 149 symtab = NULL; \
150 if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
151 dynsym = NULL; \
159 if (symtab && dynsym) { \ 152 if (symtab && dynsym) \
160 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 153 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
161 } else { \ 154 else \
162 *sym = (void*)(symtab ? symtab : dynsym); \ 155 *sym = symtab ? symtab : dynsym; \
163 } \ 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; \
164 if (strtab && dynstr) { \ 161 if (strtab && dynstr) \
165 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 162 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
166 } else { \ 163 else \
167 *tab = (void*)(strtab ? strtab : dynstr); \ 164 *str = strtab ? strtab : dynstr; \
168 } \
169 } 165 }
170 GET_SYMTABS(32) 166 GET_SYMTABS(32)
171 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)
172} 259}
173 260
174static char *scanelf_file_pax(elfobj *elf, char *found_pax) 261static char *scanelf_file_pax(elfobj *elf, char *found_pax)
175{ 262{
176 static char ret[7]; 263 static char ret[7];
203 } 290 }
204 SHOW_PAX(32) 291 SHOW_PAX(32)
205 SHOW_PAX(64) 292 SHOW_PAX(64)
206 } 293 }
207 294
208 295 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
209 if (fix_elf && setpax) { 296 * was found. This is known to break ELFs on glibc systems,
210 /* set the chpax settings */ 297 * and mainline PaX has deprecated use of this for a long time.
211 if (elf->elf_class == ELFCLASS32) { 298 * We could support changing PT_GNU_STACK, but that doesn't
212 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC) 299 * seem like it's worth the effort. #411919
213 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax)); 300 */
214 } else {
215 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
216 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
217 }
218 }
219 301
220 /* fall back to EI_PAX if no PT_PAX was found */ 302 /* fall back to EI_PAX if no PT_PAX was found */
221 if (!*ret) { 303 if (!*ret) {
222 static char *paxflags; 304 static char *paxflags;
223 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 305 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
237static 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)
238{ 320{
239 static char ret[12]; 321 static char ret[12];
240 char *found; 322 char *found;
241 unsigned long i, shown, multi_stack, multi_relro, multi_load; 323 unsigned long i, shown, multi_stack, multi_relro, multi_load;
242 int max_pt_load;
243 324
244 if (!show_phdr) return NULL; 325 if (!show_phdr) return NULL;
245 326
246 memcpy(ret, "--- --- ---\0", 12); 327 memcpy(ret, "--- --- ---\0", 12);
247 328
248 shown = 0; 329 shown = 0;
249 multi_stack = multi_relro = multi_load = 0; 330 multi_stack = multi_relro = multi_load = 0;
250 max_pt_load = elf_max_pt_load(elf);
251 331
252#define NOTE_GNU_STACK ".note.GNU-stack" 332#define NOTE_GNU_STACK ".note.GNU-stack"
253#define SHOW_PHDR(B) \ 333#define SHOW_PHDR(B) \
254 if (elf->elf_class == ELFCLASS ## B) { \ 334 if (elf->elf_class == ELFCLASS ## B) { \
255 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 335 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
271 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 351 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
272 found = found_relro; \ 352 found = found_relro; \
273 offset = 4; \ 353 offset = 4; \
274 check_flags = PF_X; \ 354 check_flags = PF_X; \
275 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 355 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
276 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
277 if (multi_load++ > max_pt_load) \
278 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
279 if (file_matches_list(elf->filename, qa_wx_load)) \ 356 if (file_matches_list(elf->filename, qa_wx_load)) \
280 continue; \ 357 continue; \
281 found = found_load; \ 358 found = found_load; \
282 offset = 8; \ 359 offset = 8; \
283 check_flags = PF_W|PF_X; \ 360 check_flags = PF_W|PF_X; \
298 } else if (elf->shdr != NULL) { \ 375 } else if (elf->shdr != NULL) { \
299 /* no program headers which means this is prob an object file */ \ 376 /* no program headers which means this is prob an object file */ \
300 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 377 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
301 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 378 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
302 char *str; \ 379 char *str; \
303 if ((void*)strtbl > (void*)elf->data_end) \ 380 if ((void*)strtbl > elf->data_end) \
304 goto skip_this_shdr##B; \ 381 goto skip_this_shdr##B; \
305 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 382 check_flags = SHF_WRITE|SHF_EXECINSTR; \
306 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 383 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
307 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 384 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
308 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 385 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
339 return NULL; 416 return NULL;
340 else 417 else
341 return ret; 418 return ret;
342} 419}
343 420
421/*
422 * See if this ELF contains a DT_TEXTREL tag in any of its
423 * PT_DYNAMIC sections.
424 */
344static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 425static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
345{ 426{
346 static const char *ret = "TEXTREL"; 427 static const char *ret = "TEXTREL";
347 unsigned long i; 428 unsigned long i;
348 429
359 Elf ## B ## _Off offset; \ 440 Elf ## B ## _Off offset; \
360 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 441 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
361 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \ 442 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
362 offset = EGET(phdr[i].p_offset); \ 443 offset = EGET(phdr[i].p_offset); \
363 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 444 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
364 dyn = DYN ## B (elf->data + offset); \ 445 dyn = DYN ## B (elf->vdata + offset); \
365 while (EGET(dyn->d_tag) != DT_NULL) { \ 446 while (EGET(dyn->d_tag) != DT_NULL) { \
366 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 447 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
367 *found_textrel = 1; \ 448 *found_textrel = 1; \
368 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 449 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
369 return (be_wewy_wewy_quiet ? NULL : ret); \ 450 return (be_wewy_wewy_quiet ? NULL : ret); \
379 return NULL; 460 return NULL;
380 else 461 else
381 return " - "; 462 return " - ";
382} 463}
383 464
465/*
466 * Scan the .text section to see if there are any relocations in it.
467 * Should rewrite this to check PT_LOAD sections that are marked
468 * Executable rather than the section named '.text'.
469 */
384static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 470static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
385{ 471{
386 unsigned long s, r, rmax; 472 unsigned long s, r, rmax;
387 void *symtab_void, *strtab_void, *text_void; 473 void *symtab_void, *strtab_void, *text_void;
388 474
409 Elf ## B ## _Rela *rela; \ 495 Elf ## B ## _Rela *rela; \
410 /* search the section headers for relocations */ \ 496 /* search the section headers for relocations */ \
411 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 497 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
412 uint32_t sh_type = EGET(shdr[s].sh_type); \ 498 uint32_t sh_type = EGET(shdr[s].sh_type); \
413 if (sh_type == SHT_REL) { \ 499 if (sh_type == SHT_REL) { \
414 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 500 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
415 rela = NULL; \ 501 rela = NULL; \
416 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 502 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
417 } else if (sh_type == SHT_RELA) { \ 503 } else if (sh_type == SHT_RELA) { \
418 rel = NULL; \ 504 rel = NULL; \
419 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 505 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
420 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 506 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
421 } else \ 507 } else \
422 continue; \ 508 continue; \
423 /* now see if any of the relocs are in the .text */ \ 509 /* now see if any of the relocs are in the .text */ \
424 for (r = 0; r < rmax; ++r) { \ 510 for (r = 0; r < rmax; ++r) { \
439 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 525 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
440 if (be_verbose <= 2) continue; \ 526 if (be_verbose <= 2) continue; \
441 } else \ 527 } else \
442 *found_textrels = 1; \ 528 *found_textrels = 1; \
443 /* locate this relocation symbol name */ \ 529 /* locate this relocation symbol name */ \
444 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 530 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
445 if ((void*)sym > (void*)elf->data_end) { \ 531 if ((void*)sym > elf->data_end) { \
446 warn("%s: corrupt ELF symbol", elf->filename); \ 532 warn("%s: corrupt ELF symbol", elf->filename); \
447 continue; \ 533 continue; \
448 } \ 534 } \
449 sym_max = ELF ## B ## _R_SYM(r_info); \ 535 sym_max = ELF ## B ## _R_SYM(r_info); \
450 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 536 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
453 sym = NULL; \ 539 sym = NULL; \
454 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 540 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
455 /* show the raw details about this reloc */ \ 541 /* show the raw details about this reloc */ \
456 printf(" %s: ", elf->base_filename); \ 542 printf(" %s: ", elf->base_filename); \
457 if (sym && sym->st_name) \ 543 if (sym && sym->st_name) \
458 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 544 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
459 else \ 545 else \
460 printf("(memory/data?)"); \ 546 printf("(memory/data?)"); \
461 printf(" [0x%lX]", (unsigned long)r_offset); \ 547 printf(" [0x%lX]", (unsigned long)r_offset); \
462 /* now try to find the closest symbol that this rel is probably in */ \ 548 /* now try to find the closest symbol that this rel is probably in */ \
463 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 549 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
464 func = NULL; \ 550 func = NULL; \
465 offset_tmp = 0; \ 551 offset_tmp = 0; \
466 while (sym_max--) { \ 552 while (sym_max--) { \
467 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 553 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
468 func = sym; \ 554 func = sym; \
479 printf("%s", func_name); \ 565 printf("%s", func_name); \
480 } else \ 566 } else \
481 printf("(optimized out)"); \ 567 printf("(optimized out)"); \
482 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 568 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
483 if (be_verbose && has_objdump) { \ 569 if (be_verbose && has_objdump) { \
570 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
484 char *sysbuf; \ 571 char *sysbuf; \
485 size_t syslen; \ 572 size_t syslen; \
486 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"; \ 573 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
487 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \ 574 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
488 sysbuf = xmalloc(syslen); \ 575 sysbuf = xmalloc(syslen); \
489 if (sysbuf) { \
490 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
491 if (end_addr < r_offset) \ 576 if (end_addr < r_offset) \
492 /* not uncommon when things are optimized out */ \ 577 /* not uncommon when things are optimized out */ \
493 end_addr = r_offset + 0x100; \ 578 end_addr = r_offset + 0x100; \
494 snprintf(sysbuf, syslen, sysfmt, \ 579 snprintf(sysbuf, syslen, sysfmt, \
495 (unsigned long)offset_tmp, \ 580 (unsigned long)offset_tmp, \
496 (unsigned long)end_addr, \ 581 (unsigned long)end_addr, \
497 elf->filename, \ 582 elf->filename, \
498 (unsigned long)r_offset); \ 583 (unsigned long)r_offset); \
499 fflush(stdout); \ 584 fflush(stdout); \
500 system(sysbuf); \ 585 if (system(sysbuf)) /* don't care */; \
501 fflush(stdout); \ 586 fflush(stdout); \
502 free(sysbuf); \ 587 free(sysbuf); \
503 } \
504 } \ 588 } \
505 } \ 589 } \
506 } } 590 } }
507 SHOW_TEXTRELS(32) 591 SHOW_TEXTRELS(32)
508 SHOW_TEXTRELS(64) 592 SHOW_TEXTRELS(64)
511 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 595 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
512 596
513 return NULL; 597 return NULL;
514} 598}
515 599
516static void rpath_security_checks(elfobj *, char *, const char *);
517static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type) 600static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
518{ 601{
519 struct stat st; 602 struct stat st;
520 switch (*item) { 603 switch (*item) {
521 case '/': break; 604 case '/': break;
537 break; 620 break;
538 } 621 }
539} 622}
540static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 623static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
541{ 624{
542 unsigned long i, s; 625 unsigned long i;
543 char *rpath, *runpath, **r; 626 char *rpath, *runpath, **r;
544 void *strtbl_void; 627 void *strtbl_void;
545 628
546 if (!show_rpath) return; 629 if (!show_rpath) return;
547 630
562 /* Just scan dynamic headers */ \ 645 /* Just scan dynamic headers */ \
563 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \ 646 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
564 offset = EGET(phdr[i].p_offset); \ 647 offset = EGET(phdr[i].p_offset); \
565 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
566 /* Just scan dynamic RPATH/RUNPATH headers */ \ 649 /* Just scan dynamic RPATH/RUNPATH headers */ \
567 dyn = DYN ## B (elf->data + offset); \ 650 dyn = DYN ## B (elf->vdata + offset); \
568 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 651 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
569 if (word == DT_RPATH) { \ 652 if (word == DT_RPATH) { \
570 r = &rpath; \ 653 r = &rpath; \
571 } else if (word == DT_RUNPATH) { \ 654 } else if (word == DT_RUNPATH) { \
572 r = &runpath; \ 655 r = &runpath; \
576 } \ 659 } \
577 /* Verify the memory is somewhat sane */ \ 660 /* Verify the memory is somewhat sane */ \
578 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 661 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
579 if (offset < (Elf ## B ## _Off)elf->len) { \ 662 if (offset < (Elf ## B ## _Off)elf->len) { \
580 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 663 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
581 *r = (char*)(elf->data + offset); \ 664 *r = elf->data + offset; \
582 /* cache the length in case we need to nuke this section later on */ \ 665 /* cache the length in case we need to nuke this section later on */ \
583 if (fix_elf) \ 666 if (fix_elf) \
584 offset = strlen(*r); \ 667 offset = strlen(*r); \
585 /* If quiet, don't output paths in ld.so.conf */ \ 668 /* If quiet, don't output paths in ld.so.conf */ \
586 if (be_quiet) { \ 669 if (be_quiet) { \
592 /* scan each path in : delimited list */ \ 675 /* scan each path in : delimited list */ \
593 while (start) { \ 676 while (start) { \
594 rpath_security_checks(elf, start, get_elfdtype(word)); \ 677 rpath_security_checks(elf, start, get_elfdtype(word)); \
595 end = strchr(start, ':'); \ 678 end = strchr(start, ':'); \
596 len = (end ? abs(end - start) : strlen(start)); \ 679 len = (end ? abs(end - start) : strlen(start)); \
597 if (use_ldcache) \ 680 if (use_ldcache) { \
598 for (s = 0; ldpaths[s]; ++s) \ 681 size_t n; \
682 const char *ldpath; \
683 array_for_each(ldpaths, n, ldpath) \
599 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 684 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
600 *r = end; \ 685 *r = end; \
601 /* corner case ... if RPATH reads "/usr/lib:", we want \ 686 /* corner case ... if RPATH reads "/usr/lib:", we want \
602 * to show ':' rather than '' */ \ 687 * to show ':' rather than '' */ \
603 if (end && end[1] != '\0') \ 688 if (end && end[1] != '\0') \
604 (*r)++; \ 689 (*r)++; \
605 break; \ 690 break; \
606 } \ 691 } \
692 } \
607 if (!*r || !end) \ 693 if (!*r || !end) \
608 break; \ 694 break; \
609 else \ 695 else \
610 start = start + len + 1; \ 696 start = start + len + 1; \
611 } \ 697 } \
677 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 763 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
678 else if (!be_quiet) 764 else if (!be_quiet)
679 xstrcat(ret, " - ", ret_len); 765 xstrcat(ret, " - ", ret_len);
680} 766}
681 767
768/* Defines can be seen in glibc's sysdeps/generic/ldconfig.h */
682#define LDSO_CACHE_MAGIC "ld.so-" 769#define LDSO_CACHE_MAGIC "ld.so-"
683#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 770#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
684#define LDSO_CACHE_VER "1.7.0" 771#define LDSO_CACHE_VER "1.7.0"
685#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 772#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
686#define FLAG_ANY -1 773#define FLAG_ANY -1
695#define FLAG_X8664_LIB64 0x0300 782#define FLAG_X8664_LIB64 0x0300
696#define FLAG_S390_LIB64 0x0400 783#define FLAG_S390_LIB64 0x0400
697#define FLAG_POWERPC_LIB64 0x0500 784#define FLAG_POWERPC_LIB64 0x0500
698#define FLAG_MIPS64_LIBN32 0x0600 785#define FLAG_MIPS64_LIBN32 0x0600
699#define FLAG_MIPS64_LIBN64 0x0700 786#define FLAG_MIPS64_LIBN64 0x0700
700 787#define FLAG_X8664_LIBX32 0x0800
701static char *lookup_cache_lib(elfobj *, char *); 788#define FLAG_ARM_LIBHF 0x0900
789#define FLAG_AARCH64_LIB64 0x0a00
702 790
703#if defined(__GLIBC__) || defined(__UCLIBC__) 791#if defined(__GLIBC__) || defined(__UCLIBC__)
704 792
705static char *lookup_cache_lib(elfobj *elf, char *fname) 793static char *lookup_cache_lib(elfobj *elf, const char *fname)
706{ 794{
707 int fd = 0; 795 int fd;
708 char *strs; 796 char *strs;
709 static char buf[__PAX_UTILS_PATH_MAX] = ""; 797 static char buf[__PAX_UTILS_PATH_MAX] = "";
710 const char *cachefile = "/etc/ld.so.cache"; 798 const char *cachefile = root_rel_path("/etc/ld.so.cache");
711 struct stat st; 799 struct stat st;
712 800
713 typedef struct { 801 typedef struct {
714 char magic[LDSO_CACHE_MAGIC_LEN]; 802 char magic[LDSO_CACHE_MAGIC_LEN];
715 char version[LDSO_CACHE_VER_LEN]; 803 char version[LDSO_CACHE_VER_LEN];
725 libentry_t *libent; 813 libentry_t *libent;
726 814
727 if (fname == NULL) 815 if (fname == NULL)
728 return NULL; 816 return NULL;
729 817
730 if (ldcache == 0) { 818 if (ldcache == NULL) {
731 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1) 819 if (fstatat(root_fd, cachefile, &st, 0))
820 return NULL;
821
822 fd = openat(root_fd, cachefile, O_RDONLY);
823 if (fd == -1)
732 return NULL; 824 return NULL;
733 825
734 /* cache these values so we only map/unmap the cache file once */ 826 /* cache these values so we only map/unmap the cache file once */
735 ldcache_size = st.st_size; 827 ldcache_size = st.st_size;
736 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0); 828 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
737
738 close(fd); 829 close(fd);
739 830
740 if (ldcache == (caddr_t)-1) { 831 if (ldcache == MAP_FAILED) {
741 ldcache = 0; 832 ldcache = NULL;
742 return NULL; 833 return NULL;
743 } 834 }
744 835
745 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 836 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
837 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
838 {
839 munmap(ldcache, ldcache_size);
840 ldcache = NULL;
746 return NULL; 841 return NULL;
747 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
748 return NULL;
749 } 842 }
843 } else
844 header = ldcache;
750 845
751 header = (header_t *) ldcache;
752 libent = (libentry_t *) (ldcache + sizeof(header_t)); 846 libent = ldcache + sizeof(header_t);
753 strs = (char *) &libent[header->nlibs]; 847 strs = (char *) &libent[header->nlibs];
754 848
755 for (fd = 0; fd < header->nlibs; fd++) { 849 for (fd = 0; fd < header->nlibs; ++fd) {
756 /* this should be more fine grained, but for now we assume that 850 /* This should be more fine grained, but for now we assume that
757 * diff arches will not be cached together. and we ignore the 851 * diff arches will not be cached together, and we ignore the
758 * the different multilib mips cases. */ 852 * the different multilib mips cases.
853 */
759 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK)) 854 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
760 continue; 855 continue;
761 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK)) 856 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
762 continue; 857 continue;
763 858
764 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 859 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
765 continue; 860 continue;
861
862 /* Return first hit because that is how the ldso rolls */
766 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 863 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
864 break;
767 } 865 }
866
768 return buf; 867 return buf;
769} 868}
869
770#elif defined(__NetBSD__) 870#elif defined(__NetBSD__)
771static char *lookup_cache_lib(elfobj *elf, char *fname) 871static char *lookup_cache_lib(elfobj *elf, const char *fname)
772{ 872{
773 static char buf[__PAX_UTILS_PATH_MAX] = ""; 873 static char buf[__PAX_UTILS_PATH_MAX] = "";
774 static struct stat st; 874 static struct stat st;
775 875 size_t n;
776 char **ldpath; 876 char *ldpath;
777 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) { 877
878 array_for_each(ldpath, n, ldpath) {
778 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf)) 879 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
779 continue; /* if the pathname is too long, or something went wrong, ignore */ 880 continue; /* if the pathname is too long, or something went wrong, ignore */
780 881
781 if (stat(buf, &st) != 0) 882 if (stat(buf, &st) != 0)
782 continue; /* if the lib doesn't exist in *ldpath, look further */ 883 continue; /* if the lib doesn't exist in *ldpath, look further */
783 884
791 892
792 /* not found in any path */ 893 /* not found in any path */
793 return NULL; 894 return NULL;
794} 895}
795#else 896#else
897#ifdef __ELF__
796#warning Cache support not implemented for your target 898#warning Cache support not implemented for your target
899#endif
797static char *lookup_cache_lib(elfobj *elf, char *fname) 900static char *lookup_cache_lib(elfobj *elf, const char *fname)
798{ 901{
799 return NULL; 902 return NULL;
800} 903}
801#endif 904#endif
905
906static char *lookup_config_lib(elfobj *elf, char *fname)
907{
908 static char buf[__PAX_UTILS_PATH_MAX] = "";
909 const char *ldpath;
910 size_t n;
911
912 array_for_each(ldpaths, n, ldpath) {
913 snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
914 if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
915 return buf;
916 }
917
918 return NULL;
919}
802 920
803static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 921static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
804{ 922{
805 unsigned long i; 923 unsigned long i;
806 char *needed; 924 char *needed;
807 void *strtbl_void; 925 void *strtbl_void;
808 char *p; 926 char *p;
809 927
928 /*
929 * -n -> op==0 -> print all
930 * -N -> op==1 -> print requested
931 */
810 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 932 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
933 return NULL;
811 934
812 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 935 strtbl_void = elf_findsecbyname(elf, ".dynstr");
813 936
814 if (elf->phdr && strtbl_void) { 937 if (elf->phdr && strtbl_void) {
815#define SHOW_NEEDED(B) \ 938#define SHOW_NEEDED(B) \
817 Elf ## B ## _Dyn *dyn; \ 940 Elf ## B ## _Dyn *dyn; \
818 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 941 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
819 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 942 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
820 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 943 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
821 Elf ## B ## _Off offset; \ 944 Elf ## B ## _Off offset; \
945 size_t matched = 0; \
946 /* Walk all the program headers to find the PT_DYNAMIC */ \
822 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 947 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
823 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \ 948 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
949 continue; \
824 offset = EGET(phdr[i].p_offset); \ 950 offset = EGET(phdr[i].p_offset); \
825 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 951 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
952 continue; \
953 /* Walk all the dynamic tags to find NEEDED entries */ \
826 dyn = DYN ## B (elf->data + offset); \ 954 dyn = DYN ## B (elf->vdata + offset); \
827 while (EGET(dyn->d_tag) != DT_NULL) { \ 955 while (EGET(dyn->d_tag) != DT_NULL) { \
828 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 956 if (EGET(dyn->d_tag) == DT_NEEDED) { \
829 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 957 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
830 if (offset >= (Elf ## B ## _Off)elf->len) { \ 958 if (offset >= (Elf ## B ## _Off)elf->len) { \
831 ++dyn; \ 959 ++dyn; \
832 continue; \ 960 continue; \
833 } \ 961 } \
834 needed = (char*)(elf->data + offset); \ 962 needed = elf->data + offset; \
835 if (op == 0) { \ 963 if (op == 0) { \
964 /* -n -> print all entries */ \
836 if (!be_wewy_wewy_quiet) { \ 965 if (!be_wewy_wewy_quiet) { \
837 if (*found_needed) xchrcat(ret, ',', ret_len); \ 966 if (*found_needed) xchrcat(ret, ',', ret_len); \
838 if (use_ldcache) \ 967 if (use_ldpath) { \
968 if ((p = lookup_config_lib(elf, needed)) != NULL) \
969 needed = p; \
970 } else if (use_ldcache) { \
839 if ((p = lookup_cache_lib(elf, needed)) != NULL) \ 971 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
840 needed = p; \ 972 needed = p; \
973 } \
841 xstrcat(ret, needed, ret_len); \ 974 xstrcat(ret, needed, ret_len); \
842 } \ 975 } \
843 *found_needed = 1; \ 976 *found_needed = 1; \
844 } else { \ 977 } else { \
845 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \ 978 /* -N -> print matching entries */ \
979 size_t n; \
980 const char *find_lib_name; \
981 \
982 array_for_each(find_lib_arr, n, find_lib_name) { \
983 int invert = 1; \
984 if (find_lib_name[0] == '!') \
985 invert = 0, ++find_lib_name; \
986 if (!strcmp(find_lib_name, needed) == invert) \
987 ++matched; \
988 } \
989 \
990 if (matched == array_cnt(find_lib_arr)) { \
846 *found_lib = 1; \ 991 *found_lib = 1; \
847 return (be_wewy_wewy_quiet ? NULL : needed); \ 992 return (be_wewy_wewy_quiet ? NULL : find_lib); \
848 } \ 993 } \
849 } \ 994 } \
850 } \ 995 } \
851 ++dyn; \ 996 ++dyn; \
852 } \ 997 } \
874 *found_interp = 1; \ 1019 *found_interp = 1; \
875 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ 1020 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
876 } 1021 }
877 SHOW_INTERP(32) 1022 SHOW_INTERP(32)
878 SHOW_INTERP(64) 1023 SHOW_INTERP(64)
1024 } else {
1025 /* Walk all the program headers to find the PT_INTERP */
1026#define SHOW_PT_INTERP(B) \
1027 if (elf->elf_class == ELFCLASS ## B) { \
1028 unsigned long i; \
1029 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1030 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1031 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1032 if (EGET(phdr[i].p_type) != PT_INTERP) \
1033 continue; \
1034 *found_interp = 1; \
1035 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1036 } \
879 } 1037 }
1038 SHOW_PT_INTERP(32)
1039 SHOW_PT_INTERP(64)
1040 }
1041
880 return NULL; 1042 return NULL;
881} 1043}
882static char *scanelf_file_bind(elfobj *elf, char *found_bind) 1044static char *scanelf_file_bind(elfobj *elf, char *found_bind)
883{ 1045{
884 unsigned long i; 1046 unsigned long i;
897 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1059 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
898 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \ 1060 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
899 dynamic = 1; \ 1061 dynamic = 1; \
900 offset = EGET(phdr[i].p_offset); \ 1062 offset = EGET(phdr[i].p_offset); \
901 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1063 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
902 dyn = DYN ## B (elf->data + offset); \ 1064 dyn = DYN ## B (elf->vdata + offset); \
903 while (EGET(dyn->d_tag) != DT_NULL) { \ 1065 while (EGET(dyn->d_tag) != DT_NULL) { \
904 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 1066 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
905 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 1067 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
906 { \ 1068 { \
907 if (be_quiet) return NULL; \ 1069 if (be_quiet) return NULL; \
920 /* don't output anything if quiet mode and the ELF is static or not setuid */ 1082 /* don't output anything if quiet mode and the ELF is static or not setuid */
921 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) { 1083 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
922 return NULL; 1084 return NULL;
923 } else { 1085 } else {
924 *found_bind = 1; 1086 *found_bind = 1;
925 return (char *) (dynamic ? "LAZY" : "STATIC"); 1087 return (char *)(dynamic ? "LAZY" : "STATIC");
926 } 1088 }
927} 1089}
928static char *scanelf_file_soname(elfobj *elf, char *found_soname) 1090static char *scanelf_file_soname(elfobj *elf, char *found_soname)
929{ 1091{
930 unsigned long i; 1092 unsigned long i;
942 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 1104 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
943 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 1105 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
944 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 1106 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
945 Elf ## B ## _Off offset; \ 1107 Elf ## B ## _Off offset; \
946 /* only look for soname in shared objects */ \ 1108 /* only look for soname in shared objects */ \
947 if (ehdr->e_type != ET_DYN) \ 1109 if (EGET(ehdr->e_type) != ET_DYN) \
948 return NULL; \ 1110 return NULL; \
949 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 1111 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
950 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \ 1112 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
951 offset = EGET(phdr[i].p_offset); \ 1113 offset = EGET(phdr[i].p_offset); \
952 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 1114 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
953 dyn = DYN ## B (elf->data + offset); \ 1115 dyn = DYN ## B (elf->vdata + offset); \
954 while (EGET(dyn->d_tag) != DT_NULL) { \ 1116 while (EGET(dyn->d_tag) != DT_NULL) { \
955 if (EGET(dyn->d_tag) == DT_SONAME) { \ 1117 if (EGET(dyn->d_tag) == DT_SONAME) { \
956 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 1118 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
957 if (offset >= (Elf ## B ## _Off)elf->len) { \ 1119 if (offset >= (Elf ## B ## _Off)elf->len) { \
958 ++dyn; \ 1120 ++dyn; \
959 continue; \ 1121 continue; \
960 } \ 1122 } \
961 soname = (char*)(elf->data + offset); \ 1123 soname = elf->data + offset; \
962 *found_soname = 1; \ 1124 *found_soname = 1; \
963 return (be_wewy_wewy_quiet ? NULL : soname); \ 1125 return (be_wewy_wewy_quiet ? NULL : soname); \
964 } \ 1126 } \
965 ++dyn; \ 1127 ++dyn; \
966 } \ 1128 } \
970 } 1132 }
971 1133
972 return NULL; 1134 return NULL;
973} 1135}
974 1136
1137/*
1138 * We support the symbol form:
1139 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1140 * If the symbol name is empty, then all symbols are matched.
1141 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1142 * Do not rely on this output format at all.
1143 * Otherwise the symbol name is used to search (either regex or string compare).
1144 * If the first char of the symbol name is a plus ("+"), then only match
1145 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1146 * Putting modifiers in between the percent signs allows for more in depth
1147 * filters. There are groups of modifiers. If you don't specify a member
1148 * of a group, then all types in that group are matched. The current
1149 * groups and their types are:
1150 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1151 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1152 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1153 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1154 * You can search for multiple symbols at once by seperating with a comma (",").
1155 *
1156 * Some examples:
1157 * ELFs with a weak function "foo":
1158 * scanelf -s %wf%foo <ELFs>
1159 * ELFs that define the symbol "main":
1160 * scanelf -s +main <ELFs>
1161 * scanelf -s %d%main <ELFs>
1162 * ELFs that refer to the undefined symbol "brk":
1163 * scanelf -s -brk <ELFs>
1164 * scanelf -s %u%brk <ELFs>
1165 * All global defined objects in an ELF:
1166 * scanelf -s %ogd% <ELF>
1167 */
1168static void
1169scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1170 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1171{
1172 const char *this_sym;
1173 size_t n;
1174
1175 array_for_each(find_sym_arr, n, this_sym) {
1176 bool inc_notype, inc_object, inc_func, inc_file,
1177 inc_local, inc_global, inc_weak,
1178 inc_def, inc_undef, inc_abs, inc_common;
1179
1180 /* symbol selection! */
1181 inc_notype = inc_object = inc_func = inc_file = \
1182 inc_local = inc_global = inc_weak = \
1183 inc_def = inc_undef = inc_abs = inc_common = \
1184 (*this_sym != '%');
1185
1186 /* parse the contents of %...% */
1187 if (!inc_notype) {
1188 while (*(this_sym++)) {
1189 if (*this_sym == '%') {
1190 ++this_sym;
1191 break;
1192 }
1193 switch (*this_sym) {
1194 case 'n': inc_notype = true; break;
1195 case 'o': inc_object = true; break;
1196 case 'f': inc_func = true; break;
1197 case 'F': inc_file = true; break;
1198 case 'l': inc_local = true; break;
1199 case 'g': inc_global = true; break;
1200 case 'w': inc_weak = true; break;
1201 case 'd': inc_def = true; break;
1202 case 'u': inc_undef = true; break;
1203 case 'a': inc_abs = true; break;
1204 case 'c': inc_common = true; break;
1205 default: err("invalid symbol selector '%c'", *this_sym);
1206 }
1207 }
1208
1209 /* If no types are matched, not match all */
1210 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1211 inc_notype = inc_object = inc_func = inc_file = true;
1212 if (!inc_local && !inc_global && !inc_weak)
1213 inc_local = inc_global = inc_weak = true;
1214 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1215 inc_def = inc_undef = inc_abs = inc_common = true;
1216
1217 /* backwards compat for defined/undefined short hand */
1218 } else if (*this_sym == '+') {
1219 inc_undef = false;
1220 ++this_sym;
1221 } else if (*this_sym == '-') {
1222 inc_def = inc_abs = inc_common = false;
1223 ++this_sym;
1224 }
1225
1226 /* filter symbols */
1227 if ((!inc_notype && stt == STT_NOTYPE) || \
1228 (!inc_object && stt == STT_OBJECT) || \
1229 (!inc_func && stt == STT_FUNC ) || \
1230 (!inc_file && stt == STT_FILE ) || \
1231 (!inc_local && stb == STB_LOCAL ) || \
1232 (!inc_global && stb == STB_GLOBAL) || \
1233 (!inc_weak && stb == STB_WEAK ) || \
1234 (!inc_def && shn && shn < SHN_LORESERVE) || \
1235 (!inc_undef && shn == SHN_UNDEF ) || \
1236 (!inc_abs && shn == SHN_ABS ) || \
1237 (!inc_common && shn == SHN_COMMON))
1238 continue;
1239
1240 if (*this_sym == '*') {
1241 /* a "*" symbol gets you debug output */
1242 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1243 ((*found_sym == 0) ? "\n\t" : "\t"),
1244 elf->base_filename,
1245 size,
1246 get_elfstttype(stt),
1247 get_elfstbtype(stb),
1248 get_elfshntype(shn),
1249 symname);
1250 goto matched;
1251
1252 } else {
1253 if (g_match) {
1254 /* regex match the symbol */
1255 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1256 continue;
1257
1258 } else if (*this_sym) {
1259 /* give empty symbols a "pass", else do a normal compare */
1260 const size_t len = strlen(this_sym);
1261 if (!(strncmp(this_sym, symname, len) == 0 &&
1262 /* Accept unversioned symbol names */
1263 (symname[len] == '\0' || symname[len] == '@')))
1264 continue;
1265 }
1266
1267 if (be_semi_verbose) {
1268 char buf[1024];
1269 snprintf(buf, sizeof(buf), "%lX %s %s",
1270 size,
1271 get_elfstttype(stt),
1272 this_sym);
1273 *ret = xstrdup(buf);
1274 } else {
1275 if (*ret) xchrcat(ret, ',', ret_len);
1276 xstrcat(ret, symname, ret_len);
1277 }
1278
1279 goto matched;
1280 }
1281 }
1282
1283 return;
1284
1285 matched:
1286 *found_sym = 1;
1287}
1288
975static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1289static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
976{ 1290{
977 unsigned long i;
978 char *ret; 1291 char *ret;
979 void *symtab_void, *strtab_void; 1292 void *symtab_void, *strtab_void;
980 1293
981 if (!find_sym) return NULL; 1294 if (!find_sym) return NULL;
982 ret = find_sym; 1295 ret = NULL;
983 1296
984 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1297 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
985 1298
986 if (symtab_void && strtab_void) { 1299 if (symtab_void && strtab_void) {
987#define FIND_SYM(B) \ 1300#define FIND_SYM(B) \
988 if (elf->elf_class == ELFCLASS ## B) { \ 1301 if (elf->elf_class == ELFCLASS ## B) { \
989 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1302 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
990 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1303 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
991 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1304 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
992 unsigned long cnt = EGET(symtab->sh_entsize); \ 1305 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
993 char *symname; \ 1306 char *symname; \
1307 size_t ret_len = 0; \
994 if (cnt) \ 1308 if (cnt) \
995 cnt = EGET(symtab->sh_size) / cnt; \ 1309 cnt = EGET(symtab->sh_size) / cnt; \
996 for (i = 0; i < cnt; ++i) { \ 1310 for (i = 0; i < cnt; ++i) { \
1311 if ((void*)sym > elf->data_end) { \
1312 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1313 goto break_out; \
1314 } \
997 if (sym->st_name) { \ 1315 if (sym->st_name) { \
998 /* make sure the symbol name is in acceptable memory range */ \ 1316 /* make sure the symbol name is in acceptable memory range */ \
999 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1317 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1000 if ((void*)symname > (void*)elf->data_end) { \ 1318 if ((void*)symname > elf->data_end) { \
1001 warnf("%s: corrupt ELF symbols", elf->filename); \ 1319 warnf("%s: corrupt ELF symbols", elf->filename); \
1002 ++sym; \ 1320 ++sym; \
1003 continue; \ 1321 continue; \
1004 } \ 1322 } \
1005 /* debug display ... show all symbols and some extra info */ \ 1323 scanelf_match_symname(elf, found_sym, \
1006 if (g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \ 1324 &ret, &ret_len, symname, \
1007 printf("%s(%s) %5lX %15s %s %s\n", \ 1325 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1008 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1326 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1009 elf->base_filename, \ 1327 EGET(sym->st_shndx), \
1010 (unsigned long)sym->st_size, \ 1328 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1011 get_elfstttype(sym->st_info), \ 1329 EGET(sym->st_size)); \
1012 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
1013 *found_sym = 1; \
1014 } else { \
1015 /* allow the user to specify a comma delimited list of symbols to search for */ \
1016 char *this_sym, *this_sym_ver, *next_sym; \
1017 this_sym = ret; \
1018 this_sym_ver = versioned_symname; \
1019 do { \
1020 next_sym = strchr(this_sym, ','); \
1021 if (next_sym == NULL) \
1022 next_sym = this_sym + strlen(this_sym); \
1023 /* do we want a defined symbol ? */ \
1024 if (*this_sym == '+') { \
1025 if (sym->st_shndx == SHN_UNDEF) \
1026 goto skip_this_sym##B; \
1027 ++this_sym; \
1028 ++this_sym_ver; \
1029 /* do we want an undefined symbol ? */ \
1030 } else if (*this_sym == '-') { \
1031 if (sym->st_shndx != SHN_UNDEF) \
1032 goto skip_this_sym##B; \
1033 ++this_sym; \
1034 ++this_sym_ver; \
1035 } \
1036 /* ok, lets compare the name now */ \
1037 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
1038 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
1039 if (be_semi_verbose) { \
1040 char buf[126]; \
1041 snprintf(buf, sizeof(buf), "%lX %s %s", \
1042 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1043 ret = buf; \
1044 } else \
1045 ret = this_sym; \
1046 (*found_sym)++; \
1047 goto break_out; \
1048 } \
1049 skip_this_sym##B: this_sym = next_sym + 1; \
1050 } while (*next_sym != '\0'); \
1051 } \
1052 } \ 1330 } \
1053 ++sym; \ 1331 ++sym; \
1054 } } 1332 } \
1333 }
1055 FIND_SYM(32) 1334 FIND_SYM(32)
1056 FIND_SYM(64) 1335 FIND_SYM(64)
1057 } 1336 }
1058 1337
1059break_out: 1338break_out:
1062 if (*find_sym != '*' && *found_sym) 1341 if (*find_sym != '*' && *found_sym)
1063 return ret; 1342 return ret;
1064 if (be_quiet) 1343 if (be_quiet)
1065 return NULL; 1344 return NULL;
1066 else 1345 else
1067 return (char *)" - "; 1346 return " - ";
1068} 1347}
1069 1348
1070
1071static char *scanelf_file_sections(elfobj *elf, char *found_section) 1349static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1072{ 1350{
1073 if (!find_section) 1351 if (!find_section)
1074 return NULL; 1352 return NULL;
1075 1353
1076#define FIND_SECTION(B) \ 1354#define FIND_SECTION(B) \
1077 if (elf->elf_class == ELFCLASS ## B) { \ 1355 if (elf->elf_class == ELFCLASS ## B) { \
1356 size_t matched, n; \
1078 int invert; \ 1357 int invert; \
1358 const char *section_name; \
1079 Elf ## B ## _Shdr *section; \ 1359 Elf ## B ## _Shdr *section; \
1360 \
1361 matched = 0; \
1362 array_for_each(find_section_arr, n, section_name) { \
1080 invert = (*find_section == '!' ? 1 : 0); \ 1363 invert = (*section_name == '!' ? 1 : 0); \
1081 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \ 1364 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1082 if ((section == NULL && invert) || (section != NULL && !invert)) \ 1365 if ((section == NULL && invert) || (section != NULL && !invert)) \
1366 ++matched; \
1367 } \
1368 \
1369 if (matched == array_cnt(find_section_arr)) \
1083 *found_section = 1; \ 1370 *found_section = 1; \
1084 } 1371 }
1085 FIND_SECTION(32) 1372 FIND_SECTION(32)
1086 FIND_SECTION(64) 1373 FIND_SECTION(64)
1087 1374
1092 return find_section; 1379 return find_section;
1093 1380
1094 if (be_quiet) 1381 if (be_quiet)
1095 return NULL; 1382 return NULL;
1096 else 1383 else
1097 return (char *)" - "; 1384 return " - ";
1098} 1385}
1099 1386
1100/* scan an elf file and show all the fun stuff */ 1387/* scan an elf file and show all the fun stuff */
1101#define prints(str) write(fileno(stdout), str, strlen(str)) 1388#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1102static int scanelf_elfobj(elfobj *elf) 1389static int scanelf_elfobj(elfobj *elf)
1103{ 1390{
1104 unsigned long i; 1391 unsigned long i;
1105 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1392 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1106 found_rpath, found_needed, found_interp, found_bind, found_soname, 1393 found_rpath, found_needed, found_interp, found_bind, found_soname,
1120 printf("%s: scanning file\n", elf->filename); 1407 printf("%s: scanning file\n", elf->filename);
1121 1408
1122 /* init output buffer */ 1409 /* init output buffer */
1123 if (!out_buffer) { 1410 if (!out_buffer) {
1124 out_len = sizeof(char) * 80; 1411 out_len = sizeof(char) * 80;
1125 out_buffer = (char*)xmalloc(out_len); 1412 out_buffer = xmalloc(out_len);
1126 } 1413 }
1127 *out_buffer = '\0'; 1414 *out_buffer = '\0';
1128 1415
1129 /* show the header */ 1416 /* show the header */
1130 if (!be_quiet && show_banner) { 1417 if (!be_quiet && show_banner) {
1142 case 'x': prints(" PAX "); break; 1429 case 'x': prints(" PAX "); break;
1143 case 'e': prints("STK/REL/PTL "); break; 1430 case 'e': prints("STK/REL/PTL "); break;
1144 case 't': prints("TEXTREL "); break; 1431 case 't': prints("TEXTREL "); break;
1145 case 'r': prints("RPATH "); break; 1432 case 'r': prints("RPATH "); break;
1146 case 'M': prints("CLASS "); break; 1433 case 'M': prints("CLASS "); break;
1434 case 'l':
1147 case 'n': prints("NEEDED "); break; 1435 case 'n': prints("NEEDED "); break;
1148 case 'i': prints("INTERP "); break; 1436 case 'i': prints("INTERP "); break;
1149 case 'b': prints("BIND "); break; 1437 case 'b': prints("BIND "); break;
1438 case 'Z': prints("SIZE "); break;
1150 case 'S': prints("SONAME "); break; 1439 case 'S': prints("SONAME "); break;
1151 case 's': prints("SYM "); break; 1440 case 's': prints("SYM "); break;
1152 case 'N': prints("LIB "); break; 1441 case 'N': prints("LIB "); break;
1153 case 'T': prints("TEXTRELS "); break; 1442 case 'T': prints("TEXTRELS "); break;
1154 case 'k': prints("SECTION "); break; 1443 case 'k': prints("SECTION "); break;
1155 case 'a': prints("ARCH "); break; 1444 case 'a': prints("ARCH "); break;
1445 case 'I': prints("OSABI "); break;
1446 case 'Y': prints("EABI "); break;
1156 case 'O': prints("PERM "); break; 1447 case 'O': prints("PERM "); break;
1157 case 'D': prints("ENDIAN "); break; 1448 case 'D': prints("ENDIAN "); break;
1158 default: warnf("'%c' has no title ?", out_format[i]); 1449 default: warnf("'%c' has no title ?", out_format[i]);
1159 } 1450 }
1160 } 1451 }
1166 1457
1167 /* dump all the good stuff */ 1458 /* dump all the good stuff */
1168 for (i = 0; out_format[i]; ++i) { 1459 for (i = 0; out_format[i]; ++i) {
1169 const char *out; 1460 const char *out;
1170 const char *tmp; 1461 const char *tmp;
1171 1462 static char ubuf[sizeof(unsigned long)*2];
1172 if (!IS_MODIFIER(out_format[i])) { 1463 if (!IS_MODIFIER(out_format[i])) {
1173 xchrcat(&out_buffer, out_format[i], &out_len); 1464 xchrcat(&out_buffer, out_format[i], &out_len);
1174 continue; 1465 continue;
1175 } 1466 }
1176 1467
1214 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1505 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1215 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1506 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1216 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1507 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1217 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break; 1508 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1218 case 'D': out = get_endian(elf); break; 1509 case 'D': out = get_endian(elf); break;
1219 case 'O': out = getstr_perms(elf->filename); break; 1510 case 'O': out = strfileperms(elf->filename); break;
1220 case 'n': 1511 case 'n':
1221 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1512 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1222 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1513 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1223 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1514 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1224 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1515 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1225 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1516 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1226 case 'k': out = scanelf_file_sections(elf, &found_section); break; 1517 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1227 case 'a': out = get_elfemtype(elf); break; 1518 case 'a': out = get_elfemtype(elf); break;
1519 case 'I': out = get_elfosabi(elf); break;
1520 case 'Y': out = get_elf_eabi(elf); break;
1521 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1228 default: warnf("'%c' has no scan code?", out_format[i]); 1522 default: warnf("'%c' has no scan code?", out_format[i]);
1229 } 1523 }
1230 if (out) { 1524 if (out)
1231 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1232 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1233 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1234 else
1235 xstrcat(&out_buffer, out, &out_len); 1525 xstrcat(&out_buffer, out, &out_len);
1236 }
1237 } 1526 }
1238 1527
1239#define FOUND_SOMETHING() \ 1528#define FOUND_SOMETHING() \
1240 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1529 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1241 found_rpath || found_needed || found_interp || found_bind || \ 1530 found_rpath || found_needed || found_interp || found_bind || \
1260 elfobj *elf; 1549 elfobj *elf;
1261 1550
1262 /* verify this is real ELF */ 1551 /* verify this is real ELF */
1263 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) { 1552 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1264 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 1553 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1265 return ret; 1554 return 2;
1266 } 1555 }
1267 switch (match_bits) { 1556 switch (match_bits) {
1268 case 32: 1557 case 32:
1269 if (elf->elf_class != ELFCLASS32) 1558 if (elf->elf_class != ELFCLASS32)
1270 goto label_done; 1559 goto label_done;
1273 if (elf->elf_class != ELFCLASS64) 1562 if (elf->elf_class != ELFCLASS64)
1274 goto label_done; 1563 goto label_done;
1275 break; 1564 break;
1276 default: break; 1565 default: break;
1277 } 1566 }
1278 if (strlen(match_etypes)) { 1567 if (match_etypes) {
1279 char sbuf[126]; 1568 char sbuf[126];
1280 strncpy(sbuf, match_etypes, sizeof(sbuf)); 1569 strncpy(sbuf, match_etypes, sizeof(sbuf));
1281 if (strchr(match_etypes, ',') != NULL) { 1570 if (strchr(match_etypes, ',') != NULL) {
1282 char *p; 1571 char *p;
1283 while((p = strrchr(sbuf, ',')) != NULL) { 1572 while ((p = strrchr(sbuf, ',')) != NULL) {
1284 *p = 0; 1573 *p = 0;
1285 if (etype_lookup(p+1) == get_etype(elf)) 1574 if (etype_lookup(p+1) == get_etype(elf))
1286 goto label_ret; 1575 goto label_ret;
1287 } 1576 }
1288 } 1577 }
1308 1597
1309 ar = ar_open_fd(filename, fd); 1598 ar = ar_open_fd(filename, fd);
1310 if (ar == NULL) 1599 if (ar == NULL)
1311 return 1; 1600 return 1;
1312 1601
1313 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0); 1602 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1314 while ((m=ar_next(ar)) != NULL) { 1603 while ((m = ar_next(ar)) != NULL) {
1604 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1605 if (cur_pos == -1)
1606 errp("lseek() failed");
1315 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size); 1607 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1316 if (elf) { 1608 if (elf) {
1317 scanelf_elfobj(elf); 1609 scanelf_elfobj(elf);
1318 unreadelf(elf); 1610 unreadelf(elf);
1319 } 1611 }
1320 } 1612 }
1321 munmap(ar_buffer, len); 1613 munmap(ar_buffer, len);
1322 1614
1323 return 0; 1615 return 0;
1324} 1616}
1325/* scan a file which may be an elf or an archive or some other magical beast */ 1617/* scan a file which may be an elf or an archive or some other magical beast */
1326static int scanelf_file(const char *filename, const struct stat *st_cache) 1618static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1327{ 1619{
1328 const struct stat *st = st_cache; 1620 const struct stat *st = st_cache;
1329 struct stat symlink_st; 1621 struct stat symlink_st;
1330 int fd; 1622 int fd;
1331 1623
1332 /* always handle regular files and handle symlinked files if no -y */ 1624 /* always handle regular files and handle symlinked files if no -y */
1333 if (S_ISLNK(st->st_mode)) { 1625 if (S_ISLNK(st->st_mode)) {
1334 if (!scan_symlink) return 1; 1626 if (!scan_symlink)
1627 return 1;
1335 stat(filename, &symlink_st); 1628 fstatat(dir_fd, filename, &symlink_st, 0);
1336 st = &symlink_st; 1629 st = &symlink_st;
1337 } 1630 }
1338 1631
1339 if (!S_ISREG(st->st_mode)) { 1632 if (!S_ISREG(st->st_mode)) {
1340 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1633 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1343 1636
1344 if (match_perms) { 1637 if (match_perms) {
1345 if ((st->st_mode | match_perms) != st->st_mode) 1638 if ((st->st_mode | match_perms) != st->st_mode)
1346 return 1; 1639 return 1;
1347 } 1640 }
1348 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1) 1641 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1642 if (fd == -1) {
1643 if (fix_elf && errno == ETXTBSY)
1644 warnp("%s: could not fix", filename);
1645 else if (be_verbose > 2)
1646 printf("%s: skipping file: %s\n", filename, strerror(errno));
1349 return 1; 1647 return 1;
1648 }
1350 1649
1351 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives) 1650 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1352 /* if it isn't an ELF, maybe it's an .a archive */ 1651 /* if it isn't an ELF, maybe it's an .a archive */
1652 if (scan_archives)
1353 scanelf_archive(filename, fd, st->st_size); 1653 scanelf_archive(filename, fd, st->st_size);
1354 1654
1655 /*
1656 * unreadelf() implicitly closes its fd, so only close it
1657 * when we are returning it in the non-ELF case
1658 */
1355 close(fd); 1659 close(fd);
1660 }
1661
1356 return 0; 1662 return 0;
1357} 1663}
1358 1664
1359/* scan a directory for ET_EXEC files and print when we find one */ 1665/* scan a directory for ET_EXEC files and print when we find one */
1360static int scanelf_dir(const char *path) 1666static int scanelf_dirat(int dir_fd, const char *path)
1361{ 1667{
1362 register DIR *dir; 1668 register DIR *dir;
1363 register struct dirent *dentry; 1669 register struct dirent *dentry;
1364 struct stat st_top, st; 1670 struct stat st_top, st;
1365 char buf[__PAX_UTILS_PATH_MAX]; 1671 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1366 size_t pathlen = 0, len = 0; 1672 size_t pathlen = 0, len = 0;
1367 int ret = 0; 1673 int ret = 0;
1674 int subdir_fd;
1368 1675
1369 /* make sure path exists */ 1676 /* make sure path exists */
1370 if (lstat(path, &st_top) == -1) { 1677 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1371 if (be_verbose > 2) printf("%s: does not exist\n", path); 1678 if (be_verbose > 2) printf("%s: does not exist\n", path);
1372 return 1; 1679 return 1;
1373 } 1680 }
1374 1681
1375 /* ok, if it isn't a directory, assume we can open it */ 1682 /* ok, if it isn't a directory, assume we can open it */
1376 if (!S_ISDIR(st_top.st_mode)) { 1683 if (!S_ISDIR(st_top.st_mode))
1377 return scanelf_file(path, &st_top); 1684 return scanelf_fileat(dir_fd, path, &st_top);
1378 }
1379 1685
1380 /* now scan the dir looking for fun stuff */ 1686 /* now scan the dir looking for fun stuff */
1381 if ((dir = opendir(path)) == NULL) { 1687 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1382 warnf("could not opendir %s: %s", path, strerror(errno)); 1688 if (subdir_fd == -1)
1689 dir = NULL;
1690 else
1691 dir = fdopendir(subdir_fd);
1692 if (dir == NULL) {
1693 if (subdir_fd != -1)
1694 close(subdir_fd);
1695 else if (be_verbose > 2)
1696 printf("%s: skipping dir: %s\n", path, strerror(errno));
1383 return 1; 1697 return 1;
1384 } 1698 }
1385 if (be_verbose > 1) printf("%s: scanning dir\n", path); 1699 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1386 1700
1387 pathlen = strlen(path); 1701 subpath = stpcpy(buf, path);
1702 if (subpath[-1] != '/')
1703 *subpath++ = '/';
1704 pathlen = subpath - buf;
1388 while ((dentry = readdir(dir))) { 1705 while ((dentry = readdir(dir))) {
1389 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1706 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1390 continue; 1707 continue;
1391 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1708
1392 if (len >= sizeof(buf)) { 1709 if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1393 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1394 (unsigned long)len, (unsigned long)sizeof(buf));
1395 continue; 1710 continue;
1711
1712 len = strlen(dentry->d_name);
1713 if (len + pathlen + 1 >= sizeof(buf)) {
1714 warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1715 path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1716 continue;
1396 } 1717 }
1397 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name); 1718 memcpy(subpath, dentry->d_name, len);
1398 if (lstat(buf, &st) != -1) { 1719 subpath[len] = '\0';
1720
1399 if (S_ISREG(st.st_mode)) 1721 if (S_ISREG(st.st_mode))
1400 ret = scanelf_file(buf, &st); 1722 ret = scanelf_fileat(dir_fd, buf, &st);
1401 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1723 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1402 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1724 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1403 ret = scanelf_dir(buf); 1725 ret = scanelf_dirat(dir_fd, buf);
1404 }
1405 } 1726 }
1406 } 1727 }
1407 closedir(dir); 1728 closedir(dir);
1729
1408 return ret; 1730 return ret;
1409} 1731}
1732static int scanelf_dir(const char *path)
1733{
1734 return scanelf_dirat(root_fd, root_rel_path(path));
1735}
1410 1736
1411static int scanelf_from_file(const char *filename) 1737static int scanelf_from_file(const char *filename)
1412{ 1738{
1413 FILE *fp = NULL; 1739 FILE *fp;
1414 char *p; 1740 char *p, *path;
1415 char path[__PAX_UTILS_PATH_MAX]; 1741 size_t len;
1416 int ret = 0; 1742 int ret;
1417 1743
1418 if (strcmp(filename, "-") == 0) 1744 if (strcmp(filename, "-") == 0)
1419 fp = stdin; 1745 fp = stdin;
1420 else if ((fp = fopen(filename, "r")) == NULL) 1746 else if ((fp = fopen(filename, "r")) == NULL)
1421 return 1; 1747 return 1;
1422 1748
1423 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) { 1749 path = NULL;
1750 len = 0;
1751 ret = 0;
1752 while (getline(&path, &len, fp) != -1) {
1424 if ((p = strchr(path, '\n')) != NULL) 1753 if ((p = strchr(path, '\n')) != NULL)
1425 *p = 0; 1754 *p = 0;
1426 search_path = path; 1755 search_path = path;
1427 ret = scanelf_dir(path); 1756 ret = scanelf_dir(path);
1428 } 1757 }
1758 free(path);
1759
1429 if (fp != stdin) 1760 if (fp != stdin)
1430 fclose(fp); 1761 fclose(fp);
1762
1431 return ret; 1763 return ret;
1432} 1764}
1433 1765
1434#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__) 1766#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1435 1767
1436static int load_ld_cache_config(int i, const char *fname) 1768static int _load_ld_cache_config(const char *fname)
1437{ 1769{
1438 FILE *fp = NULL; 1770 FILE *fp = NULL;
1439 char *p; 1771 char *p, *path;
1440 char path[__PAX_UTILS_PATH_MAX]; 1772 size_t len;
1773 int curr_fd = -1;
1441 1774
1442 if (i + 1 == ARRAY_SIZE(ldpaths)) 1775 fp = fopenat_r(root_fd, root_rel_path(fname));
1776 if (fp == NULL)
1443 return i; 1777 return -1;
1444 1778
1445 if ((fp = fopen(fname, "r")) == NULL) 1779 path = NULL;
1446 return i; 1780 len = 0;
1447 1781 while (getline(&path, &len, fp) != -1) {
1448 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1449 if ((p = strrchr(path, '\r')) != NULL) 1782 if ((p = strrchr(path, '\r')) != NULL)
1450 *p = 0; 1783 *p = 0;
1451 if ((p = strchr(path, '\n')) != NULL) 1784 if ((p = strchr(path, '\n')) != NULL)
1452 *p = 0; 1785 *p = 0;
1453#ifdef __linux__ 1786
1454 // recursive includes of the same file will make this segfault. 1787 /* recursive includes of the same file will make this segfault. */
1455 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) { 1788 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1456 glob64_t gl; 1789 glob_t gl;
1457 size_t x; 1790 size_t x;
1458 char gpath[__PAX_UTILS_PATH_MAX]; 1791 const char *gpath;
1459 1792
1460 memset(gpath, 0, sizeof(gpath)); 1793 /* re-use existing path buffer ... need to be creative */
1461
1462 if (path[8] != '/') 1794 if (path[8] != '/')
1463 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]); 1795 gpath = memcpy(path + 3, "/etc/", 5);
1464 else 1796 else
1465 strncpy(gpath, &path[8], sizeof(gpath)); 1797 gpath = path + 8;
1798 if (root_fd != AT_FDCWD) {
1799 if (curr_fd == -1) {
1800 curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1801 if (fchdir(root_fd))
1802 errp("unable to change to root dir");
1803 }
1804 gpath = root_rel_path(gpath);
1805 }
1466 1806
1467 if ((glob64(gpath, 0, NULL, &gl)) == 0) { 1807 if (glob(gpath, 0, NULL, &gl) == 0) {
1468 for (x = 0; x < gl.gl_pathc; ++x) { 1808 for (x = 0; x < gl.gl_pathc; ++x) {
1469 /* try to avoid direct loops */ 1809 /* try to avoid direct loops */
1470 if (strcmp(gl.gl_pathv[x], fname) == 0) 1810 if (strcmp(gl.gl_pathv[x], fname) == 0)
1471 continue; 1811 continue;
1472 i = load_ld_cache_config(i, gl.gl_pathv[x]); 1812 _load_ld_cache_config(gl.gl_pathv[x]);
1473 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1474 globfree64(&gl);
1475 return i;
1476 }
1477 } 1813 }
1478 globfree64 (&gl); 1814 globfree(&gl);
1479 continue;
1480 } 1815 }
1816
1817 /* failed globs are ignored by glibc */
1818 continue;
1481 } 1819 }
1482#endif 1820
1483 if (*path != '/') 1821 if (*path != '/')
1484 continue; 1822 continue;
1485 1823
1486 ldpaths[i++] = xstrdup(path); 1824 xarraypush_str(ldpaths, path);
1487
1488 if (i + 1 == ARRAY_SIZE(ldpaths))
1489 break;
1490 } 1825 }
1491 ldpaths[i] = NULL; 1826 free(path);
1492 1827
1493 fclose(fp); 1828 fclose(fp);
1829
1830 if (curr_fd != -1) {
1831 if (fchdir(curr_fd))
1832 /* don't care */;
1833 close(curr_fd);
1834 }
1835
1494 return i; 1836 return 0;
1495} 1837}
1496 1838
1497#elif defined(__FreeBSD__) || (__DragonFly__) 1839#elif defined(__FreeBSD__) || defined(__DragonFly__)
1498 1840
1499static int load_ld_cache_config(int i, const char *fname) 1841static int _load_ld_cache_config(const char *fname)
1500{ 1842{
1501 FILE *fp = NULL; 1843 FILE *fp = NULL;
1502 char *b = NULL, *p; 1844 char *b = NULL, *p;
1503 struct elfhints_hdr hdr; 1845 struct elfhints_hdr hdr;
1504 1846
1505 if (i + 1 == ARRAY_SIZE(ldpaths)) 1847 fp = fopenat_r(root_fd, root_rel_path(fname));
1848 if (fp == NULL)
1506 return i; 1849 return -1;
1507
1508 if ((fp = fopen(fname, "r")) == NULL)
1509 return i;
1510 1850
1511 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) || 1851 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1512 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 || 1852 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1513 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1) 1853 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1514 { 1854 {
1515 fclose(fp); 1855 fclose(fp);
1516 return i; 1856 return -1;
1517 } 1857 }
1518 1858
1519 b = (char*)malloc(hdr.dirlistlen+1); 1859 b = xmalloc(hdr.dirlistlen + 1);
1520 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) { 1860 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1521 fclose(fp); 1861 fclose(fp);
1522 free(b); 1862 free(b);
1523 return i; 1863 return -1;
1524 } 1864 }
1525 1865
1526 while ((p = strsep(&b, ":"))) { 1866 while ((p = strsep(&b, ":"))) {
1527 if (*p == '\0') continue; 1867 if (*p == '\0')
1528 ldpaths[i++] = xstrdup(p); 1868 continue;
1529 1869 xarraypush_str(ldpaths, p);
1530 if (i + 1 == ARRAY_SIZE(ldpaths))
1531 break;
1532 } 1870 }
1533 ldpaths[i] = NULL;
1534 1871
1535 free(b); 1872 free(b);
1536 fclose(fp); 1873 fclose(fp);
1537 return i; 1874 return 0;
1538} 1875}
1539 1876
1540#else 1877#else
1541 1878#ifdef __ELF__
1542#warning Cache config support not implemented for your target 1879#warning Cache config support not implemented for your target
1543static int load_ld_cache_config(int i, const char *fname)
1544{
1545 memset(ldpaths, 0x00, sizeof(ldpaths));
1546}
1547
1548#endif 1880#endif
1881static int _load_ld_cache_config(const char *fname)
1882{
1883 return 0;
1884}
1885#endif
1886
1887static void load_ld_cache_config(const char *fname)
1888{
1889 bool scan_l, scan_ul, scan_ull;
1890 size_t n;
1891 const char *ldpath;
1892
1893 _load_ld_cache_config(fname);
1894
1895 scan_l = scan_ul = scan_ull = false;
1896 if (array_cnt(ldpaths)) {
1897 array_for_each(ldpaths, n, ldpath) {
1898 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1899 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1900 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1901 }
1902 }
1903
1904 if (!scan_l) xarraypush_str(ldpaths, "/lib");
1905 if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1906 if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1907}
1549 1908
1550/* scan /etc/ld.so.conf for paths */ 1909/* scan /etc/ld.so.conf for paths */
1551static void scanelf_ldpath(void) 1910static void scanelf_ldpath(void)
1552{ 1911{
1553 char scan_l, scan_ul, scan_ull; 1912 size_t n;
1554 int i = 0; 1913 const char *ldpath;
1555 1914
1556 if (!ldpaths[0]) 1915 array_for_each(ldpaths, n, ldpath)
1557 err("Unable to load any paths from ld.so.conf");
1558
1559 scan_l = scan_ul = scan_ull = 0;
1560
1561 while (ldpaths[i]) {
1562 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1563 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1564 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1565 scanelf_dir(ldpaths[i]); 1916 scanelf_dir(ldpath);
1566 ++i;
1567 }
1568
1569 if (!scan_l) scanelf_dir("/lib");
1570 if (!scan_ul) scanelf_dir("/usr/lib");
1571 if (!scan_ull) scanelf_dir("/usr/local/lib");
1572} 1917}
1573 1918
1574/* scan env PATH for paths */ 1919/* scan env PATH for paths */
1575static void scanelf_envpath(void) 1920static void scanelf_envpath(void)
1576{ 1921{
1587 } 1932 }
1588 1933
1589 free(path); 1934 free(path);
1590} 1935}
1591 1936
1592
1593/* usage / invocation handling functions */ /* Free Flags: c d j u w C G H I J K P Q U W Y Z */ 1937/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1594#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DO:BhV" 1938#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1595#define a_argument required_argument 1939#define a_argument required_argument
1596static struct option const long_opts[] = { 1940static struct option const long_opts[] = {
1597 {"path", no_argument, NULL, 'p'}, 1941 {"path", no_argument, NULL, 'p'},
1598 {"ldpath", no_argument, NULL, 'l'}, 1942 {"ldpath", no_argument, NULL, 'l'},
1943 {"use-ldpath",no_argument, NULL, 129},
1944 {"root", a_argument, NULL, 128},
1599 {"recursive", no_argument, NULL, 'R'}, 1945 {"recursive", no_argument, NULL, 'R'},
1600 {"mount", no_argument, NULL, 'm'}, 1946 {"mount", no_argument, NULL, 'm'},
1601 {"symlink", no_argument, NULL, 'y'}, 1947 {"symlink", no_argument, NULL, 'y'},
1602 {"archives", no_argument, NULL, 'A'}, 1948 {"archives", no_argument, NULL, 'A'},
1603 {"ldcache", no_argument, NULL, 'L'}, 1949 {"ldcache", no_argument, NULL, 'L'},
1617 {"gmatch", no_argument, NULL, 'g'}, 1963 {"gmatch", no_argument, NULL, 'g'},
1618 {"textrels", no_argument, NULL, 'T'}, 1964 {"textrels", no_argument, NULL, 'T'},
1619 {"etype", a_argument, NULL, 'E'}, 1965 {"etype", a_argument, NULL, 'E'},
1620 {"bits", a_argument, NULL, 'M'}, 1966 {"bits", a_argument, NULL, 'M'},
1621 {"endian", no_argument, NULL, 'D'}, 1967 {"endian", no_argument, NULL, 'D'},
1968 {"osabi", no_argument, NULL, 'I'},
1969 {"eabi", no_argument, NULL, 'Y'},
1622 {"perms", a_argument, NULL, 'O'}, 1970 {"perms", a_argument, NULL, 'O'},
1971 {"size", no_argument, NULL, 'Z'},
1623 {"all", no_argument, NULL, 'a'}, 1972 {"all", no_argument, NULL, 'a'},
1624 {"quiet", no_argument, NULL, 'q'}, 1973 {"quiet", no_argument, NULL, 'q'},
1625 {"verbose", no_argument, NULL, 'v'}, 1974 {"verbose", no_argument, NULL, 'v'},
1626 {"format", a_argument, NULL, 'F'}, 1975 {"format", a_argument, NULL, 'F'},
1627 {"from", a_argument, NULL, 'f'}, 1976 {"from", a_argument, NULL, 'f'},
1628 {"file", a_argument, NULL, 'o'}, 1977 {"file", a_argument, NULL, 'o'},
1978 {"nocolor", no_argument, NULL, 'C'},
1629 {"nobanner", no_argument, NULL, 'B'}, 1979 {"nobanner", no_argument, NULL, 'B'},
1630 {"help", no_argument, NULL, 'h'}, 1980 {"help", no_argument, NULL, 'h'},
1631 {"version", no_argument, NULL, 'V'}, 1981 {"version", no_argument, NULL, 'V'},
1632 {NULL, no_argument, NULL, 0x0} 1982 {NULL, no_argument, NULL, 0x0}
1633}; 1983};
1634 1984
1635static const char *opts_help[] = { 1985static const char * const opts_help[] = {
1636 "Scan all directories in PATH environment", 1986 "Scan all directories in PATH environment",
1637 "Scan all directories in /etc/ld.so.conf", 1987 "Scan all directories in /etc/ld.so.conf",
1988 "Use ld.so.conf to show full path (use with -r/-n)",
1989 "Root directory (use with -l or -p)",
1638 "Scan directories recursively", 1990 "Scan directories recursively",
1639 "Don't recursively cross mount points", 1991 "Don't recursively cross mount points",
1640 "Don't scan symlinks", 1992 "Don't scan symlinks",
1641 "Scan archives (.a files)", 1993 "Scan archives (.a files)",
1642 "Utilize ld.so.cache information (use with -r/-n)", 1994 "Utilize ld.so.cache to show full path (use with -r/-n)",
1643 "Try and 'fix' bad things (use with -r/-e)", 1995 "Try and 'fix' bad things (use with -r/-e)",
1644 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n", 1996 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1645 "Print PaX markings", 1997 "Print PaX markings",
1646 "Print GNU_STACK/PT_LOAD markings", 1998 "Print GNU_STACK/PT_LOAD markings",
1647 "Print TEXTREL information", 1999 "Print TEXTREL information",
1651 "Print BIND information", 2003 "Print BIND information",
1652 "Print SONAME information", 2004 "Print SONAME information",
1653 "Find a specified symbol", 2005 "Find a specified symbol",
1654 "Find a specified section", 2006 "Find a specified section",
1655 "Find a specified library", 2007 "Find a specified library",
1656 "Use strncmp to match libraries. (use with -N)", 2008 "Use regex rather than string compare (with -s); specify twice for case insensitive",
1657 "Locate cause of TEXTREL", 2009 "Locate cause of TEXTREL",
1658 "Print only ELF files matching etype ET_DYN,ET_EXEC ...", 2010 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1659 "Print only ELF files matching numeric bits", 2011 "Print only ELF files matching numeric bits",
1660 "Print Endianness", 2012 "Print Endianness",
2013 "Print OSABI",
2014 "Print EABI (EM_ARM Only)",
1661 "Print only ELF files matching octal permissions", 2015 "Print only ELF files matching octal permissions",
1662 "Print all scanned info (-x -e -t -r -b)\n", 2016 "Print ELF file size",
2017 "Print all useful/simple info\n",
1663 "Only output 'bad' things", 2018 "Only output 'bad' things",
1664 "Be verbose (can be specified more than once)", 2019 "Be verbose (can be specified more than once)",
1665 "Use specified format for output", 2020 "Use specified format for output",
1666 "Read input stream from a filename", 2021 "Read input stream from a filename",
1667 "Write output stream to a filename", 2022 "Write output stream to a filename",
2023 "Don't emit color in output",
1668 "Don't display the header", 2024 "Don't display the header",
1669 "Print this help and exit", 2025 "Print this help and exit",
1670 "Print version and exit", 2026 "Print version and exit",
1671 NULL 2027 NULL
1672}; 2028};
1673 2029
1674/* display usage and exit */ 2030/* display usage and exit */
1675static void usage(int status) 2031static void usage(int status)
1676{ 2032{
1677 unsigned long i; 2033 const char a_arg[] = "<arg>";
2034 size_t a_arg_len = strlen(a_arg) + 2;
2035 size_t i;
2036 int optlen;
1678 printf("* Scan ELF binaries for stuff\n\n" 2037 printf("* Scan ELF binaries for stuff\n\n"
1679 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0); 2038 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1680 printf("Options: -[%s]\n", PARSE_FLAGS); 2039 printf("Options: -[%s]\n", PARSE_FLAGS);
2040
2041 /* prescan the --long opt length to auto-align */
2042 optlen = 0;
1681 for (i = 0; long_opts[i].name; ++i) 2043 for (i = 0; long_opts[i].name; ++i) {
2044 int l = strlen(long_opts[i].name);
2045 if (long_opts[i].has_arg == a_argument)
2046 l += a_arg_len;
2047 optlen = max(l, optlen);
2048 }
2049
2050 for (i = 0; long_opts[i].name; ++i) {
2051 /* first output the short flag if it has one */
2052 if (long_opts[i].val > '~')
2053 printf(" ");
2054 else
2055 printf(" -%c, ", long_opts[i].val);
2056
2057 /* then the long flag */
1682 if (long_opts[i].has_arg == no_argument) 2058 if (long_opts[i].has_arg == no_argument)
1683 printf(" -%c, --%-14s* %s\n", long_opts[i].val, 2059 printf("--%-*s", optlen, long_opts[i].name);
1684 long_opts[i].name, opts_help[i]);
1685 else 2060 else
1686 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val, 2061 printf("--%s %s %*s", long_opts[i].name, a_arg,
1687 long_opts[i].name, opts_help[i]); 2062 (int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
2063
2064 /* finally the help text */
2065 printf("* %s\n", opts_help[i]);
2066 }
1688 2067
1689 puts("\nFor more information, see the scanelf(1) manpage"); 2068 puts("\nFor more information, see the scanelf(1) manpage");
1690 exit(status); 2069 exit(status);
1691} 2070}
1692 2071
1702static int parseargs(int argc, char *argv[]) 2081static int parseargs(int argc, char *argv[])
1703{ 2082{
1704 int i; 2083 int i;
1705 const char *from_file = NULL; 2084 const char *from_file = NULL;
1706 int ret = 0; 2085 int ret = 0;
2086 char load_cache_config = 0;
1707 2087
1708 opterr = 0; 2088 opterr = 0;
1709 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 2089 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1710 switch (i) { 2090 switch (i) {
1711 2091
1719 case 'f': 2099 case 'f':
1720 if (from_file) warn("You prob don't want to specify -f twice"); 2100 if (from_file) warn("You prob don't want to specify -f twice");
1721 from_file = optarg; 2101 from_file = optarg;
1722 break; 2102 break;
1723 case 'E': 2103 case 'E':
1724 strncpy(match_etypes, optarg, sizeof(match_etypes)); 2104 match_etypes = optarg;
1725 break; 2105 break;
1726 case 'M': 2106 case 'M':
1727 match_bits = atoi(optarg); 2107 match_bits = atoi(optarg);
1728 if (match_bits == 0) { 2108 if (match_bits == 0) {
1729 if (strcmp(optarg, "ELFCLASS32") == 0) 2109 if (strcmp(optarg, "ELFCLASS32") == 0)
1731 if (strcmp(optarg, "ELFCLASS64") == 0) 2111 if (strcmp(optarg, "ELFCLASS64") == 0)
1732 match_bits = 64; 2112 match_bits = 64;
1733 } 2113 }
1734 break; 2114 break;
1735 case 'O': 2115 case 'O':
1736 if (sscanf(optarg, "%o", &match_perms) == (-1)) 2116 if (sscanf(optarg, "%o", &match_perms) == -1)
1737 match_bits = 0; 2117 match_bits = 0;
1738 break; 2118 break;
1739 case 'o': { 2119 case 'o': {
1740 if (freopen(optarg, "w", stdout) == NULL) 2120 if (freopen(optarg, "w", stdout) == NULL)
1741 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 2121 errp("Could not freopen(%s)", optarg);
1742 break; 2122 break;
1743 } 2123 }
1744 case 'k': 2124 case 'k':
1745 if (find_section) warn("You prob don't want to specify -k twice"); 2125 xarraypush_str(find_section_arr, optarg);
1746 find_section = optarg;
1747 break; 2126 break;
1748 case 's': { 2127 case 's': {
1749 if (find_sym) warn("You prob don't want to specify -s twice"); 2128 /* historically, this was comma delimited */
1750 find_sym = optarg; 2129 char *this_sym = strtok(optarg, ",");
1751 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1)); 2130 if (!this_sym) /* edge case: -s '' */
1752 sprintf(versioned_symname, "%s@", find_sym); 2131 xarraypush_str(find_sym_arr, "");
2132 while (this_sym) {
2133 xarraypush_str(find_sym_arr, this_sym);
2134 this_sym = strtok(NULL, ",");
2135 }
1753 break; 2136 break;
1754 } 2137 }
1755 case 'N': { 2138 case 'N':
1756 if (find_lib) warn("You prob don't want to specify -N twice"); 2139 xarraypush_str(find_lib_arr, optarg);
1757 find_lib = optarg;
1758 break; 2140 break;
1759 }
1760
1761 case 'F': { 2141 case 'F': {
1762 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");
1763 out_format = optarg; 2143 out_format = optarg;
1764 break; 2144 break;
1765 } 2145 }
1766 case 'z': { 2146 case 'z': {
1767 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC); 2147 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1768 size_t x; 2148 size_t x;
1769 2149
1770 for (x = 0 ; x < strlen(optarg); x++) { 2150 for (x = 0; x < strlen(optarg); x++) {
1771 switch(optarg[x]) { 2151 switch (optarg[x]) {
1772 case 'p': 2152 case 'p':
1773 case 'P': 2153 case 'P':
1774 do_pax_state(optarg[x], PAGEEXEC); 2154 do_pax_state(optarg[x], PAGEEXEC);
1775 break; 2155 break;
1776 case 's': 2156 case 's':
1804 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) || 2184 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1805 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)))) 2185 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1806 setpax = flags; 2186 setpax = flags;
1807 break; 2187 break;
1808 } 2188 }
2189 case 'Z': show_size = 1; break;
1809 case 'g': g_match = 1; break; 2190 case 'g': ++g_match; break;
1810 case 'L': use_ldcache = 1; break; 2191 case 'L': load_cache_config = use_ldcache = 1; break;
1811 case 'y': scan_symlink = 0; break; 2192 case 'y': scan_symlink = 0; break;
1812 case 'A': scan_archives = 1; break; 2193 case 'A': scan_archives = 1; break;
2194 case 'C': color_init(true); break;
1813 case 'B': show_banner = 0; break; 2195 case 'B': show_banner = 0; break;
1814 case 'l': scan_ldpath = 1; break; 2196 case 'l': load_cache_config = scan_ldpath = 1; break;
1815 case 'p': scan_envpath = 1; break; 2197 case 'p': scan_envpath = 1; break;
1816 case 'R': dir_recurse = 1; break; 2198 case 'R': dir_recurse = 1; break;
1817 case 'm': dir_crossmount = 0; break; 2199 case 'm': dir_crossmount = 0; break;
1818 case 'X': ++fix_elf; break; 2200 case 'X': ++fix_elf; break;
1819 case 'x': show_pax = 1; break; 2201 case 'x': show_pax = 1; break;
1823 case 'n': show_needed = 1; break; 2205 case 'n': show_needed = 1; break;
1824 case 'i': show_interp = 1; break; 2206 case 'i': show_interp = 1; break;
1825 case 'b': show_bind = 1; break; 2207 case 'b': show_bind = 1; break;
1826 case 'S': show_soname = 1; break; 2208 case 'S': show_soname = 1; break;
1827 case 'T': show_textrels = 1; break; 2209 case 'T': show_textrels = 1; break;
1828 case 'q': be_quiet = 1; break; 2210 case 'q': be_quiet = min(be_quiet, 20) + 1; break;
1829 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2211 case 'v': be_verbose = min(be_verbose, 20) + 1; break;
1830 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break; 2212 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1831 case 'D': show_endian = 1; break; 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;
1832 case ':': 2222 case ':':
1833 err("Option '%c' is missing parameter", optopt); 2223 err("Option '%c' is missing parameter", optopt);
1834 case '?': 2224 case '?':
1835 err("Unknown option '%c' or argument missing", optopt); 2225 err("Unknown option '%c' or argument missing", optopt);
1836 default: 2226 default:
1837 err("Unhandled option '%c'; please report this", i); 2227 err("Unhandled option '%c'; please report this", i);
1838 } 2228 }
1839 } 2229 }
1840 if (show_textrels && be_verbose) { 2230 if (show_textrels && be_verbose)
1841 if (which("objdump") != NULL) 2231 has_objdump = bin_in_path("objdump");
1842 has_objdump = 1; 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);
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));
1843 } 2264 }
2265 }
2266 /* flatten arrays for display */
2267 if (array_cnt(find_sym_arr))
2268 find_sym = array_flatten_str(find_sym_arr);
2269 if (array_cnt(find_lib_arr))
2270 find_lib = array_flatten_str(find_lib_arr);
2271 if (array_cnt(find_section_arr))
2272 find_section = array_flatten_str(find_section_arr);
1844 /* let the format option override all other options */ 2273 /* let the format option override all other options */
1845 if (out_format) { 2274 if (out_format) {
1846 show_pax = show_phdr = show_textrel = show_rpath = \ 2275 show_pax = show_phdr = show_textrel = show_rpath = \
1847 show_needed = show_interp = show_bind = show_soname = \ 2276 show_needed = show_interp = show_bind = show_soname = \
1848 show_textrels = show_perms = show_endian = 0; 2277 show_textrels = show_perms = show_endian = show_size = \
2278 show_osabi = show_eabi = 0;
1849 for (i = 0; out_format[i]; ++i) { 2279 for (i = 0; out_format[i]; ++i) {
1850 if (!IS_MODIFIER(out_format[i])) continue; 2280 if (!IS_MODIFIER(out_format[i])) continue;
1851 2281
1852 switch (out_format[++i]) { 2282 switch (out_format[++i]) {
1853 case '+': break; 2283 case '+': break;
1860 case 's': break; 2290 case 's': break;
1861 case 'N': break; 2291 case 'N': break;
1862 case 'o': break; 2292 case 'o': break;
1863 case 'a': break; 2293 case 'a': break;
1864 case 'M': break; 2294 case 'M': break;
2295 case 'Z': show_size = 1; break;
1865 case 'D': show_endian = 1; break; 2296 case 'D': show_endian = 1; break;
2297 case 'I': show_osabi = 1; break;
2298 case 'Y': show_eabi = 1; break;
1866 case 'O': show_perms = 1; break; 2299 case 'O': show_perms = 1; break;
1867 case 'x': show_pax = 1; break; 2300 case 'x': show_pax = 1; break;
1868 case 'e': show_phdr = 1; break; 2301 case 'e': show_phdr = 1; break;
1869 case 't': show_textrel = 1; break; 2302 case 't': show_textrel = 1; break;
1870 case 'r': show_rpath = 1; break; 2303 case 'r': show_rpath = 1; break;
1872 case 'i': show_interp = 1; break; 2305 case 'i': show_interp = 1; break;
1873 case 'b': show_bind = 1; break; 2306 case 'b': show_bind = 1; break;
1874 case 'S': show_soname = 1; break; 2307 case 'S': show_soname = 1; break;
1875 case 'T': show_textrels = 1; break; 2308 case 'T': show_textrels = 1; break;
1876 default: 2309 default:
1877 err("Invalid format specifier '%c' (byte %i)", 2310 err("invalid format specifier '%c' (byte %i)",
1878 out_format[i], i+1); 2311 out_format[i], i+1);
1879 } 2312 }
1880 } 2313 }
1881 2314
1882 /* construct our default format */ 2315 /* construct our default format */
1883 } else { 2316 } else {
1884 size_t fmt_len = 30; 2317 size_t fmt_len = 30;
1885 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2318 out_format = xmalloc(sizeof(char) * fmt_len);
2319 *out_format = '\0';
1886 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2320 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1887 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2321 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1888 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len); 2322 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2323 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1889 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len); 2324 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2325 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2326 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1890 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2327 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1891 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2328 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1892 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2329 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1893 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2330 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1894 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2331 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1901 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2338 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1902 } 2339 }
1903 if (be_verbose > 2) printf("Format: %s\n", out_format); 2340 if (be_verbose > 2) printf("Format: %s\n", out_format);
1904 2341
1905 /* now lets actually do the scanning */ 2342 /* now lets actually do the scanning */
1906 if (scan_ldpath || use_ldcache) 2343 if (load_cache_config)
1907 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG); 2344 load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1908 if (scan_ldpath) scanelf_ldpath(); 2345 if (scan_ldpath) scanelf_ldpath();
1909 if (scan_envpath) scanelf_envpath(); 2346 if (scan_envpath) scanelf_envpath();
1910 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath) 2347 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1911 from_file = "-"; 2348 from_file = "-";
1912 if (from_file) { 2349 if (from_file) {
1918 while (optind < argc) { 2355 while (optind < argc) {
1919 search_path = argv[optind++]; 2356 search_path = argv[optind++];
1920 ret = scanelf_dir(search_path); 2357 ret = scanelf_dir(search_path);
1921 } 2358 }
1922 2359
2360#ifdef __PAX_UTILS_CLEANUP
1923 /* clean up */ 2361 /* clean up */
1924 free(versioned_symname);
1925 for (i = 0; ldpaths[i]; ++i)
1926 free(ldpaths[i]); 2362 xarrayfree(ldpaths);
2363 xarrayfree(find_sym_arr);
2364 xarrayfree(find_lib_arr);
2365 xarrayfree(find_section_arr);
2366 free(find_sym);
2367 free(find_lib);
2368 free(find_section);
2369 {
2370 size_t n;
2371 regex_t *preg;
2372 array_for_each(find_sym_regex_arr, n, preg)
2373 regfree(preg);
2374 xarrayfree(find_sym_regex_arr);
2375 }
1927 2376
1928 if (ldcache != 0) 2377 if (ldcache != 0)
1929 munmap(ldcache, ldcache_size); 2378 munmap(ldcache, ldcache_size);
2379#endif
2380
1930 return ret; 2381 return ret;
1931} 2382}
1932 2383
1933static char **get_split_env(const char *envvar) 2384static char **get_split_env(const char *envvar)
1934{ 2385{
1964 return envvals; 2415 return envvals;
1965} 2416}
1966 2417
1967static void parseenv(void) 2418static void parseenv(void)
1968{ 2419{
2420 color_init(false);
1969 qa_textrels = get_split_env("QA_TEXTRELS"); 2421 qa_textrels = get_split_env("QA_TEXTRELS");
1970 qa_execstack = get_split_env("QA_EXECSTACK"); 2422 qa_execstack = get_split_env("QA_EXECSTACK");
1971 qa_wx_load = get_split_env("QA_WX_LOAD"); 2423 qa_wx_load = get_split_env("QA_WX_LOAD");
1972} 2424}
1973 2425
1978 free(qa_textrels); 2430 free(qa_textrels);
1979 free(qa_execstack); 2431 free(qa_execstack);
1980 free(qa_wx_load); 2432 free(qa_wx_load);
1981} 2433}
1982#endif 2434#endif
1983
1984 2435
1985int main(int argc, char *argv[]) 2436int main(int argc, char *argv[])
1986{ 2437{
1987 int ret; 2438 int ret;
1988 if (argc < 2) 2439 if (argc < 2)
1991 ret = parseargs(argc, argv); 2442 ret = parseargs(argc, argv);
1992 fclose(stdout); 2443 fclose(stdout);
1993#ifdef __PAX_UTILS_CLEANUP 2444#ifdef __PAX_UTILS_CLEANUP
1994 cleanup(); 2445 cleanup();
1995 warn("The calls to add/delete heap should be off:\n" 2446 warn("The calls to add/delete heap should be off:\n"
1996 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n" 2447 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
1997 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD"); 2448 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1998#endif 2449#endif
1999 return ret; 2450 return ret;
2000}
2001
2002
2003
2004/* utility funcs */
2005static char *xstrdup(const char *s)
2006{
2007 char *ret = strdup(s);
2008 if (!ret) err("Could not strdup(): %s", strerror(errno));
2009 return ret;
2010}
2011static void *xmalloc(size_t size)
2012{
2013 void *ret = malloc(size);
2014 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
2015 return ret;
2016}
2017static void *xrealloc(void *ptr, size_t size)
2018{
2019 void *ret = realloc(ptr, size);
2020 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
2021 return ret;
2022}
2023static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
2024{
2025 size_t new_len;
2026
2027 new_len = strlen(*dst) + strlen(src);
2028 if (*curr_len <= new_len) {
2029 *curr_len = new_len + (*curr_len / 2);
2030 *dst = realloc(*dst, *curr_len);
2031 if (!*dst)
2032 err("could not realloc() %li bytes", (unsigned long)*curr_len);
2033 }
2034
2035 if (n)
2036 strncat(*dst, src, n);
2037 else
2038 strcat(*dst, src);
2039}
2040static inline void xchrcat(char **dst, const char append, size_t *curr_len)
2041{
2042 static char my_app[2];
2043 my_app[0] = append;
2044 my_app[1] = '\0';
2045 xstrcat(dst, my_app, curr_len);
2046} 2451}
2047 2452
2048/* Match filename against entries in matchlist, return TRUE 2453/* Match filename against entries in matchlist, return TRUE
2049 * if the file is listed */ 2454 * if the file is listed */
2050static int file_matches_list(const char *filename, char **matchlist) 2455static int file_matches_list(const char *filename, char **matchlist)

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