/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 Revision 1.227
1/* 1/*
2 * Copyright 2003-2005 Gentoo Foundation 2 * Copyright 2003-2007 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 1.88 2005/09/30 03:30:54 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.227 2011/09/27 19:20:51 vapier Exp $
5 * 5 *
6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10#include <stdio.h>
11#include <stdlib.h>
12#include <sys/types.h>
13#include <libgen.h>
14#include <limits.h>
15#define __USE_GNU
16#include <string.h>
17#include <errno.h>
18#include <unistd.h>
19#include <sys/stat.h>
20#include <dirent.h>
21#include <getopt.h>
22#include <assert.h>
23#include "paxelf.h"
24
25static const char *rcsid = "$Id: scanelf.c,v 1.88 2005/09/30 03:30:54 vapier Exp $"; 10static const char *rcsid = "$Id: scanelf.c,v 1.227 2011/09/27 19:20:51 vapier Exp $";
26#define argv0 "scanelf" 11const char argv0[] = "scanelf";
27 12
13#include "paxinc.h"
14
28#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
29
30
31 16
32/* prototypes */ 17/* prototypes */
33static void scanelf_file(const char *filename); 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);
34static void scanelf_dir(const char *path); 23static int scanelf_dir(const char *path);
35static void scanelf_ldpath(); 24static void scanelf_ldpath(void);
36static void scanelf_envpath(); 25static void scanelf_envpath(void);
37static void usage(int status); 26static void usage(int status);
27static char **get_split_env(const char *envvar);
28static void parseenv(void);
38static void parseargs(int argc, char *argv[]); 29static int parseargs(int argc, char *argv[]);
39static char *xstrdup(const char *s);
40static void *xmalloc(size_t size);
41static void xstrcat(char **dst, const char *src, size_t *curr_len);
42static inline void xchrcat(char **dst, const char append, size_t *curr_len);
43 30
44/* variables to control behavior */ 31/* variables to control behavior */
45static char *ldpaths[256]; 32static char match_etypes[126] = "";
33static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
46static char scan_ldpath = 0; 34static char scan_ldpath = 0;
47static char scan_envpath = 0; 35static char scan_envpath = 0;
48static char scan_symlink = 1; 36static char scan_symlink = 1;
37static char scan_archives = 0;
49static char dir_recurse = 0; 38static char dir_recurse = 0;
50static char dir_crossmount = 1; 39static char dir_crossmount = 1;
51static char show_pax = 0; 40static char show_pax = 0;
41static char show_perms = 0;
42static char show_size = 0;
52static char show_phdr = 0; 43static char show_phdr = 0;
53static char show_textrel = 0; 44static char show_textrel = 0;
54static char show_rpath = 0; 45static char show_rpath = 0;
55static char show_needed = 0; 46static char show_needed = 0;
56static char show_interp = 0; 47static char show_interp = 0;
57static char show_bind = 0; 48static char show_bind = 0;
58static char show_soname = 0; 49static char show_soname = 0;
59static char show_textrels = 0; 50static char show_textrels = 0;
60static char show_banner = 1; 51static char show_banner = 1;
52static char show_endian = 0;
53static char show_osabi = 0;
54static char show_eabi = 0;
61static char be_quiet = 0; 55static char be_quiet = 0;
62static char be_verbose = 0; 56static char be_verbose = 0;
63static char be_wewy_wewy_quiet = 0; 57static char be_wewy_wewy_quiet = 0;
64static char *find_sym = NULL, *versioned_symname = NULL; 58static char be_semi_verbose = 0;
59static char *find_sym = NULL;
65static char *find_lib = NULL; 60static char *find_lib = NULL;
61static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
62static char *find_section = NULL;
63static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
66static char *out_format = NULL; 64static char *out_format = NULL;
67static char *search_path = NULL; 65static char *search_path = NULL;
66static char fix_elf = 0;
68static char gmatch = 0; 67static char g_match = 0;
68static char use_ldcache = 0;
69 69
70static char **qa_textrels = NULL;
71static char **qa_execstack = NULL;
72static char **qa_wx_load = NULL;
73static char *root;
74
75static int match_bits = 0;
76static unsigned int match_perms = 0;
77static void *ldcache = NULL;
78static size_t ldcache_size = 0;
79static unsigned long setpax = 0UL;
80
81static int has_objdump = 0;
82
83/* find the path to a file by name */
84static char *which(const char *fname)
85{
86 static char fullpath[__PAX_UTILS_PATH_MAX];
87 char *path, *p;
88
89 path = getenv("PATH");
90 if (!path)
91 return NULL;
92
93 path = xstrdup(path);
94 while ((p = strrchr(path, ':')) != NULL) {
95 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
96 *p = 0;
97 if (access(fullpath, R_OK) != -1) {
98 free(path);
99 return fullpath;
100 }
101 }
102 free(path);
103 return NULL;
104}
105
106/* 1 on failure. 0 otherwise */
107static int rematch(const char *regex, const char *match, int cflags)
108{
109 regex_t preg;
110 int ret;
111
112 if ((match == NULL) || (regex == NULL))
113 return EXIT_FAILURE;
114
115 if ((ret = regcomp(&preg, regex, cflags))) {
116 char err[256];
117
118 if (regerror(ret, &preg, err, sizeof(err)))
119 fprintf(stderr, "regcomp failed: %s", err);
120 else
121 fprintf(stderr, "regcomp failed");
122
123 return EXIT_FAILURE;
124 }
125 ret = regexec(&preg, match, 0, NULL, 0);
126 regfree(&preg);
127
128 return ret;
129}
70 130
71/* sub-funcs for scanelf_file() */ 131/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 132static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 133{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 134 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
135
136 /* debug sections */
137 void *symtab = elf_findsecbyname(elf, ".symtab");
138 void *strtab = elf_findsecbyname(elf, ".strtab");
139 /* runtime sections */
140 void *dynsym = elf_findsecbyname(elf, ".dynsym");
141 void *dynstr = elf_findsecbyname(elf, ".dynstr");
142
75#define GET_SYMTABS(B) \ 143#define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \ 144 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
78 /* debug sections */ \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
81 /* runtime sections */ \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
84 if (symtab && dynsym) { \ 145 if (symtab && dynsym) { \
146 Elf ## B ## _Shdr *esymtab = symtab; \
147 Elf ## B ## _Shdr *edynsym = dynsym; \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 148 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
86 } else { \ 149 } else \
87 *sym = (void*)(symtab ? symtab : dynsym); \ 150 *sym = symtab ? symtab : dynsym; \
88 } \
89 if (strtab && dynstr) { \ 151 if (strtab && dynstr) { \
152 Elf ## B ## _Shdr *estrtab = strtab; \
153 Elf ## B ## _Shdr *edynstr = dynstr; \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 154 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
91 } else { \ 155 } else \
92 *tab = (void*)(strtab ? strtab : dynstr); \ 156 *tab = strtab ? strtab : dynstr; \
93 } \
94 } 157 }
95 GET_SYMTABS(32) 158 GET_SYMTABS(32)
96 GET_SYMTABS(64) 159 GET_SYMTABS(64)
97} 160}
161
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 162static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 163{
100 static char *paxflags;
101 static char ret[7]; 164 static char ret[7];
102 unsigned long i, shown; 165 unsigned long i, shown;
103 166
104 if (!show_pax) return NULL; 167 if (!show_pax) return NULL;
105 168
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 175 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 176 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 177 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 178 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \ 179 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 180 if (fix_elf && setpax) { \
181 /* set the paxctl flags */ \
182 ESET(phdr[i].p_flags, setpax); \
183 } \
184 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
118 continue; \ 185 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 186 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \ 187 *found_pax = 1; \
121 ++shown; \ 188 ++shown; \
122 break; \ 189 break; \
124 } 191 }
125 SHOW_PAX(32) 192 SHOW_PAX(32)
126 SHOW_PAX(64) 193 SHOW_PAX(64)
127 } 194 }
128 195
196 if (fix_elf && setpax) {
197 /* set the chpax settings */
198 if (elf->elf_class == ELFCLASS32) {
199 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
200 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
201 } else {
202 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
203 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
204 }
205 }
206
129 /* fall back to EI_PAX if no PT_PAX was found */ 207 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 208 if (!*ret) {
209 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 210 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 211 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 212 *found_pax = 1;
134 return paxflags; 213 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 214 }
136 strncpy(ret, paxflags, sizeof(ret)); 215 strncpy(ret, paxflags, sizeof(ret));
137 } 216 }
138 217
139 if (be_quiet && !shown) 218 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 219 return NULL;
220 else
141 return ret; 221 return ret;
142
143} 222}
223
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 224static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 225{
146 static char ret[12]; 226 static char ret[12];
147 char *found; 227 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load; 228 unsigned long i, shown, multi_stack, multi_relro, multi_load;
229 int max_pt_load;
150 230
151 if (!show_phdr) return NULL; 231 if (!show_phdr) return NULL;
152 232
153 memcpy(ret, "--- --- ---\0", 12); 233 memcpy(ret, "--- --- ---\0", 12);
154 234
155 shown = 0; 235 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 236 multi_stack = multi_relro = multi_load = 0;
237 max_pt_load = elf_max_pt_load(elf);
157 238
158 if (elf->phdr) { 239#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 240#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 241 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 242 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
243 Elf ## B ## _Off offset; \
244 uint32_t flags, check_flags; \
245 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 247 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 248 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
249 if (multi_stack++) \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 250 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
251 if (file_matches_list(elf->filename, qa_execstack)) \
252 continue; \
167 found = found_phdr; \ 253 found = found_phdr; \
168 off = 0; \ 254 offset = 0; \
169 check_flags = PF_X; \ 255 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 256 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
257 if (multi_relro++) \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 258 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \ 259 found = found_relro; \
173 off = 4; \ 260 offset = 4; \
174 check_flags = PF_X; \ 261 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 262 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 263 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
264 if (multi_load++ > max_pt_load) \
265 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
266 if (file_matches_list(elf->filename, qa_wx_load)) \
267 continue; \
177 found = found_load; \ 268 found = found_load; \
178 off = 8; \ 269 offset = 8; \
179 check_flags = PF_W|PF_X; \ 270 check_flags = PF_W|PF_X; \
180 } else \ 271 } else \
181 continue; \ 272 continue; \
182 flags = EGET(phdr[i].p_flags); \ 273 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 274 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \ 275 continue; \
276 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
277 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
278 ret[3] = ret[7] = '!'; \
279 flags = EGET(phdr[i].p_flags); \
280 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 281 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 282 *found = 1; \
187 ++shown; \ 283 ++shown; \
284 } \
285 } else if (elf->shdr != NULL) { \
286 /* no program headers which means this is prob an object file */ \
287 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
288 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
289 char *str; \
290 if ((void*)strtbl > elf->data_end) \
291 goto skip_this_shdr##B; \
292 check_flags = SHF_WRITE|SHF_EXECINSTR; \
293 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
294 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
295 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
296 str = elf->data + offset; \
297 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
298 if (!strcmp(str, NOTE_GNU_STACK)) { \
299 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
300 flags = EGET(shdr[i].sh_flags); \
301 if (be_quiet && ((flags & check_flags) != check_flags)) \
302 continue; \
303 ++*found_phdr; \
304 shown = 1; \
305 if (flags & SHF_WRITE) ret[0] = 'W'; \
306 if (flags & SHF_ALLOC) ret[1] = 'A'; \
307 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
308 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
309 break; \
310 } \
311 } \
312 skip_this_shdr##B: \
313 if (!multi_stack) { \
314 if (file_matches_list(elf->filename, qa_execstack)) \
315 return NULL; \
316 *found_phdr = 1; \
317 shown = 1; \
318 memcpy(ret, "!WX", 3); \
319 } \
188 } \ 320 } \
189 } 321 }
190 SHOW_PHDR(32) 322 SHOW_PHDR(32)
191 SHOW_PHDR(64) 323 SHOW_PHDR(64)
192 }
193 324
194 if (be_quiet && !shown) 325 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 326 return NULL;
196 else 327 else
197 return ret; 328 return ret;
198} 329}
330
331/*
332 * See if this ELF contains a DT_TEXTREL tag in any of its
333 * PT_DYNAMIC sections.
334 */
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 335static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 336{
201 static char ret[] = "TEXTREL"; 337 static const char *ret = "TEXTREL";
202 unsigned long i; 338 unsigned long i;
203 339
204 if (!show_textrel && !show_textrels) return NULL; 340 if (!show_textrel && !show_textrels) return NULL;
341
342 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
205 343
206 if (elf->phdr) { 344 if (elf->phdr) {
207#define SHOW_TEXTREL(B) \ 345#define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \ 346 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \ 347 Elf ## B ## _Dyn *dyn; \
210 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 348 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
211 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 349 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
212 Elf ## B ## _Off offset; \ 350 Elf ## B ## _Off offset; \
213 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 351 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
214 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 352 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
215 offset = EGET(phdr[i].p_offset); \ 353 offset = EGET(phdr[i].p_offset); \
216 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 354 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
217 dyn = DYN ## B (elf->data + offset); \ 355 dyn = DYN ## B (elf->vdata + offset); \
218 while (EGET(dyn->d_tag) != DT_NULL) { \ 356 while (EGET(dyn->d_tag) != DT_NULL) { \
219 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 357 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
220 *found_textrel = 1; \ 358 *found_textrel = 1; \
221 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 359 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
222 return (be_wewy_wewy_quiet ? NULL : ret); \ 360 return (be_wewy_wewy_quiet ? NULL : ret); \
229 } 367 }
230 368
231 if (be_quiet || be_wewy_wewy_quiet) 369 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 370 return NULL;
233 else 371 else
234 return (char *)" - "; 372 return " - ";
235} 373}
374
375/*
376 * Scan the .text section to see if there are any relocations in it.
377 * Should rewrite this to check PT_LOAD sections that are marked
378 * Executable rather than the section named '.text'.
379 */
236static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 380static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237{ 381{
238 unsigned long s, r, rmax; 382 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 383 void *symtab_void, *strtab_void, *text_void;
240 384
261 Elf ## B ## _Rela *rela; \ 405 Elf ## B ## _Rela *rela; \
262 /* search the section headers for relocations */ \ 406 /* search the section headers for relocations */ \
263 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 407 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
264 uint32_t sh_type = EGET(shdr[s].sh_type); \ 408 uint32_t sh_type = EGET(shdr[s].sh_type); \
265 if (sh_type == SHT_REL) { \ 409 if (sh_type == SHT_REL) { \
266 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 410 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
267 rela = NULL; \ 411 rela = NULL; \
268 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 412 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
269 } else if (sh_type == SHT_RELA) { \ 413 } else if (sh_type == SHT_RELA) { \
270 rel = NULL; \ 414 rel = NULL; \
271 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 415 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
272 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 416 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
273 } else \ 417 } else \
274 continue; \ 418 continue; \
275 /* now see if any of the relocs are in the .text */ \ 419 /* now see if any of the relocs are in the .text */ \
276 for (r = 0; r < rmax; ++r) { \ 420 for (r = 0; r < rmax; ++r) { \
291 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 435 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
292 if (be_verbose <= 2) continue; \ 436 if (be_verbose <= 2) continue; \
293 } else \ 437 } else \
294 *found_textrels = 1; \ 438 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 439 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 440 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
441 if ((void*)sym > elf->data_end) { \
442 warn("%s: corrupt ELF symbol", elf->filename); \
443 continue; \
444 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 445 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 446 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 447 sym += sym_max; \
300 else \ 448 else \
301 sym = NULL; \ 449 sym = NULL; \
302 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 450 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
303 /* show the raw details about this reloc */ \ 451 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \ 452 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \ 453 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 454 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
307 else \ 455 else \
308 printf("(memory/fake?)"); \ 456 printf("(memory/data?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \ 457 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \ 458 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 459 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
312 func = NULL; \ 460 func = NULL; \
313 offset_tmp = 0; \ 461 offset_tmp = 0; \
314 while (sym_max--) { \ 462 while (sym_max--) { \
315 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 463 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
316 func = sym; \ 464 func = sym; \
317 offset_tmp = EGET(sym->st_value); \ 465 offset_tmp = EGET(sym->st_value); \
318 } \ 466 } \
319 ++sym; \ 467 ++sym; \
320 } \ 468 } \
321 printf(" in "); \ 469 printf(" in "); \
322 if (func && func->st_name) \ 470 if (func && func->st_name) { \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 471 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
472 if (r_offset > EGET(func->st_size)) \
473 printf("(optimized out: previous %s)", func_name); \
324 else \ 474 else \
325 printf("(NULL: fake?)"); \ 475 printf("%s", func_name); \
476 } else \
477 printf("(optimized out)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 478 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
479 if (be_verbose && has_objdump) { \
480 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
481 char *sysbuf; \
482 size_t syslen; \
483 int sysret; \
484 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"; \
485 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
486 sysbuf = xmalloc(syslen); \
487 if (end_addr < r_offset) \
488 /* not uncommon when things are optimized out */ \
489 end_addr = r_offset + 0x100; \
490 snprintf(sysbuf, syslen, sysfmt, \
491 (unsigned long)offset_tmp, \
492 (unsigned long)end_addr, \
493 elf->filename, \
494 (unsigned long)r_offset); \
495 fflush(stdout); \
496 sysret = system(sysbuf); \
497 fflush(stdout); \
498 free(sysbuf); \
499 } \
327 } \ 500 } \
328 } } 501 } }
329 SHOW_TEXTRELS(32) 502 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64) 503 SHOW_TEXTRELS(64)
331 } 504 }
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 506 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334 507
335 return NULL; 508 return NULL;
336} 509}
337 510
338static void rpath_security_checks(elfobj *, char *); 511static void rpath_security_checks(elfobj *, char *, const char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 512static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
513{
340 struct stat st; 514 struct stat st;
341 switch (*item) { 515 switch (*item) {
516 case '/': break;
342 case 0: 517 case '.':
343 warnf("Security problem NULL RPATH in %s", elf->filename); 518 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
344 break; 519 break;
345 case '/': break; 520 case ':':
521 case '\0':
522 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
523 break;
346 case '$': 524 case '$':
347 if (fstat(elf->fd, &st) != -1) 525 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 526 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
349 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 527 warnf("Security problem with %s='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777); 528 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
351 break; 529 break;
352 default: 530 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 531 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
354 break; 532 break;
355 } 533 }
356} 534}
357static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 535static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358{ 536{
359 unsigned long i, s; 537 unsigned long i;
360 char *rpath, *runpath, **r; 538 char *rpath, *runpath, **r;
361 void *strtbl_void; 539 void *strtbl_void;
362 540
363 if (!show_rpath) return; 541 if (!show_rpath) return;
364 542
375 Elf ## B ## _Off offset; \ 553 Elf ## B ## _Off offset; \
376 Elf ## B ## _Xword word; \ 554 Elf ## B ## _Xword word; \
377 /* Scan all the program headers */ \ 555 /* Scan all the program headers */ \
378 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 556 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
379 /* Just scan dynamic headers */ \ 557 /* Just scan dynamic headers */ \
380 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 558 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
381 offset = EGET(phdr[i].p_offset); \ 559 offset = EGET(phdr[i].p_offset); \
382 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 560 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
383 /* Just scan dynamic RPATH/RUNPATH headers */ \ 561 /* Just scan dynamic RPATH/RUNPATH headers */ \
384 dyn = DYN ## B (elf->data + offset); \ 562 dyn = DYN ## B (elf->vdata + offset); \
385 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 563 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
386 if (word == DT_RPATH) { \ 564 if (word == DT_RPATH) { \
387 r = &rpath; \ 565 r = &rpath; \
388 } else if (word == DT_RUNPATH) { \ 566 } else if (word == DT_RUNPATH) { \
389 r = &runpath; \ 567 r = &runpath; \
393 } \ 571 } \
394 /* Verify the memory is somewhat sane */ \ 572 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 573 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \ 574 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 575 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \ 576 *r = elf->data + offset; \
577 /* cache the length in case we need to nuke this section later on */ \
578 if (fix_elf) \
579 offset = strlen(*r); \
399 /* If quiet, don't output paths in ld.so.conf */ \ 580 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \ 581 if (be_quiet) { \
401 size_t len; \ 582 size_t len; \
402 char *start, *end; \ 583 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \ 584 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \ 585 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \ 586 start = *r; \
406 /* scan each path in : delimited list */ \ 587 /* scan each path in : delimited list */ \
407 while (start) { \ 588 while (start) { \
408 rpath_security_checks(elf, start); \ 589 rpath_security_checks(elf, start, get_elfdtype(word)); \
409 end = strchr(start, ':'); \ 590 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \ 591 len = (end ? abs(end - start) : strlen(start)); \
411 for (s = 0; ldpaths[s]; ++s) { \ 592 if (use_ldcache) { \
593 size_t n; \
594 const char *ldpath; \
595 array_for_each(ldpaths, n, ldpath) \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 596 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
413 *r = (end ? end + 1 : NULL); \ 597 *r = end; \
598 /* corner case ... if RPATH reads "/usr/lib:", we want \
599 * to show ':' rather than '' */ \
600 if (end && end[1] != '\0') \
601 (*r)++; \
414 break; \ 602 break; \
415 } \ 603 } \
416 } \ 604 } \
417 if (!*r || !ldpaths[s] || !end) \ 605 if (!*r || !end) \
418 start = NULL; \ 606 break; \
419 else \ 607 else \
420 start = start + len + 1; \ 608 start = start + len + 1; \
421 } \ 609 } \
422 } \ 610 } \
611 if (*r) { \
612 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
613 /* just nuke it */ \
614 nuke_it##B: \
615 memset(*r, 0x00, offset); \
616 *r = NULL; \
617 ESET(dyn->d_tag, DT_DEBUG); \
618 ESET(dyn->d_un.d_ptr, 0); \
619 } else if (fix_elf) { \
620 /* try to clean "bad" paths */ \
621 size_t len, tmpdir_len; \
622 char *start, *end; \
623 const char *tmpdir; \
624 start = *r; \
625 tmpdir = (getenv("TMPDIR") ? : "."); \
626 tmpdir_len = strlen(tmpdir); \
627 while (1) { \
628 end = strchr(start, ':'); \
629 if (start == end) { \
630 eat_this_path##B: \
631 len = strlen(end); \
632 memmove(start, end+1, len); \
633 start[len-1] = '\0'; \
634 end = start - 1; \
635 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
636 if (!end) { \
637 if (start == *r) \
638 goto nuke_it##B; \
639 *--start = '\0'; \
640 } else \
641 goto eat_this_path##B; \
642 } \
643 if (!end) \
644 break; \
645 start = end + 1; \
646 } \
647 if (**r == '\0') \
648 goto nuke_it##B; \
649 } \
650 if (*r) \
423 if (*r) *found_rpath = 1; \ 651 *found_rpath = 1; \
652 } \
424 } \ 653 } \
425 ++dyn; \ 654 ++dyn; \
426 } \ 655 } \
427 } } 656 } }
428 SHOW_RPATH(32) 657 SHOW_RPATH(32)
445 } else if (rpath || runpath) 674 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 675 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet) 676 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len); 677 xstrcat(ret, " - ", ret_len);
449} 678}
679
680#define LDSO_CACHE_MAGIC "ld.so-"
681#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
682#define LDSO_CACHE_VER "1.7.0"
683#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
684#define FLAG_ANY -1
685#define FLAG_TYPE_MASK 0x00ff
686#define FLAG_LIBC4 0x0000
687#define FLAG_ELF 0x0001
688#define FLAG_ELF_LIBC5 0x0002
689#define FLAG_ELF_LIBC6 0x0003
690#define FLAG_REQUIRED_MASK 0xff00
691#define FLAG_SPARC_LIB64 0x0100
692#define FLAG_IA64_LIB64 0x0200
693#define FLAG_X8664_LIB64 0x0300
694#define FLAG_S390_LIB64 0x0400
695#define FLAG_POWERPC_LIB64 0x0500
696#define FLAG_MIPS64_LIBN32 0x0600
697#define FLAG_MIPS64_LIBN64 0x0700
698
699static char *lookup_cache_lib(elfobj *, char *);
700
701#if defined(__GLIBC__) || defined(__UCLIBC__)
702
703static char *lookup_cache_lib(elfobj *elf, char *fname)
704{
705 int fd;
706 char *strs;
707 static char buf[__PAX_UTILS_PATH_MAX] = "";
708 const char cachefile[] = "/etc/ld.so.cache";
709 struct stat st;
710
711 typedef struct {
712 char magic[LDSO_CACHE_MAGIC_LEN];
713 char version[LDSO_CACHE_VER_LEN];
714 int nlibs;
715 } header_t;
716 header_t *header;
717
718 typedef struct {
719 int flags;
720 int sooffset;
721 int liboffset;
722 } libentry_t;
723 libentry_t *libent;
724
725 if (fname == NULL)
726 return NULL;
727
728 if (ldcache == NULL) {
729 if (stat(cachefile, &st))
730 return NULL;
731
732 fd = open(cachefile, O_RDONLY);
733 if (fd == -1)
734 return NULL;
735
736 /* cache these values so we only map/unmap the cache file once */
737 ldcache_size = st.st_size;
738 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
739 close(fd);
740
741 if (ldcache == MAP_FAILED) {
742 ldcache = NULL;
743 return NULL;
744 }
745
746 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
747 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
748 {
749 munmap(ldcache, ldcache_size);
750 ldcache = NULL;
751 return NULL;
752 }
753 } else
754 header = ldcache;
755
756 libent = ldcache + sizeof(header_t);
757 strs = (char *) &libent[header->nlibs];
758
759 for (fd = 0; fd < header->nlibs; ++fd) {
760 /* This should be more fine grained, but for now we assume that
761 * diff arches will not be cached together, and we ignore the
762 * the different multilib mips cases.
763 */
764 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
765 continue;
766 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
767 continue;
768
769 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
770 continue;
771
772 /* Return first hit because that is how the ldso rolls */
773 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
774 break;
775 }
776
777 return buf;
778}
779
780#elif defined(__NetBSD__)
781static char *lookup_cache_lib(elfobj *elf, char *fname)
782{
783 static char buf[__PAX_UTILS_PATH_MAX] = "";
784 static struct stat st;
785 size_t n;
786 char *ldpath;
787
788 array_for_each(ldpath, n, ldpath) {
789 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
790 continue; /* if the pathname is too long, or something went wrong, ignore */
791
792 if (stat(buf, &st) != 0)
793 continue; /* if the lib doesn't exist in *ldpath, look further */
794
795 /* NetBSD doesn't actually do sanity checks, it just loads the file
796 * and if that doesn't work, continues looking in other directories.
797 * This cannot easily be safely emulated, unfortunately. For now,
798 * just assume that if it exists, it's a valid library. */
799
800 return buf;
801 }
802
803 /* not found in any path */
804 return NULL;
805}
806#else
807#ifdef __ELF__
808#warning Cache support not implemented for your target
809#endif
810static char *lookup_cache_lib(elfobj *elf, char *fname)
811{
812 return NULL;
813}
814#endif
815
450static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 816static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451{ 817{
452 unsigned long i; 818 unsigned long i;
453 char *needed; 819 char *needed;
454 void *strtbl_void; 820 void *strtbl_void;
821 char *p;
455 822
823 /*
824 * -n -> op==0 -> print all
825 * -N -> op==1 -> print requested
826 */
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 827 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
828 return NULL;
457 829
458 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 830 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459 831
460 if (elf->phdr && strtbl_void) { 832 if (elf->phdr && strtbl_void) {
461#define SHOW_NEEDED(B) \ 833#define SHOW_NEEDED(B) \
463 Elf ## B ## _Dyn *dyn; \ 835 Elf ## B ## _Dyn *dyn; \
464 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 836 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
465 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 837 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
466 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 838 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
467 Elf ## B ## _Off offset; \ 839 Elf ## B ## _Off offset; \
840 size_t matched = 0; \
841 /* Walk all the program headers to find the PT_DYNAMIC */ \
468 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 842 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
469 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 843 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
844 continue; \
470 offset = EGET(phdr[i].p_offset); \ 845 offset = EGET(phdr[i].p_offset); \
471 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 846 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
847 continue; \
848 /* Walk all the dynamic tags to find NEEDED entries */ \
472 dyn = DYN ## B (elf->data + offset); \ 849 dyn = DYN ## B (elf->vdata + offset); \
473 while (EGET(dyn->d_tag) != DT_NULL) { \ 850 while (EGET(dyn->d_tag) != DT_NULL) { \
474 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 851 if (EGET(dyn->d_tag) == DT_NEEDED) { \
475 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 852 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
476 if (offset >= (Elf ## B ## _Off)elf->len) { \ 853 if (offset >= (Elf ## B ## _Off)elf->len) { \
477 ++dyn; \ 854 ++dyn; \
478 continue; \ 855 continue; \
479 } \ 856 } \
480 needed = (char*)(elf->data + offset); \ 857 needed = elf->data + offset; \
481 if (op == 0) { \ 858 if (op == 0) { \
859 /* -n -> print all entries */ \
482 if (!be_wewy_wewy_quiet) { \ 860 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \ 861 if (*found_needed) xchrcat(ret, ',', ret_len); \
862 if (use_ldcache) \
863 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
864 needed = p; \
484 xstrcat(ret, needed, ret_len); \ 865 xstrcat(ret, needed, ret_len); \
485 } \ 866 } \
486 *found_needed = 1; \ 867 *found_needed = 1; \
487 } else { \ 868 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 869 /* -N -> print matching entries */ \
870 size_t n; \
871 const char *find_lib_name; \
872 \
873 array_for_each(find_lib_arr, n, find_lib_name) \
874 if (!strcmp(find_lib_name, needed)) \
875 ++matched; \
876 \
877 if (matched == array_cnt(find_lib_arr)) { \
489 *found_lib = 1; \ 878 *found_lib = 1; \
490 return (be_wewy_wewy_quiet ? NULL : needed); \ 879 return (be_wewy_wewy_quiet ? NULL : find_lib); \
491 } \ 880 } \
492 } \ 881 } \
493 } \ 882 } \
494 ++dyn; \ 883 ++dyn; \
495 } \ 884 } \
524} 913}
525static char *scanelf_file_bind(elfobj *elf, char *found_bind) 914static char *scanelf_file_bind(elfobj *elf, char *found_bind)
526{ 915{
527 unsigned long i; 916 unsigned long i;
528 struct stat s; 917 struct stat s;
918 char dynamic = 0;
529 919
530 if (!show_bind) return NULL; 920 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL; 921 if (!elf->phdr) return NULL;
532 922
533#define SHOW_BIND(B) \ 923#define SHOW_BIND(B) \
535 Elf ## B ## _Dyn *dyn; \ 925 Elf ## B ## _Dyn *dyn; \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 926 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 927 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \ 928 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 929 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 930 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
931 dynamic = 1; \
541 offset = EGET(phdr[i].p_offset); \ 932 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 933 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \ 934 dyn = DYN ## B (elf->vdata + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \ 935 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 936 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
546 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 937 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
547 { \ 938 { \
548 if (be_quiet) return NULL; \ 939 if (be_quiet) return NULL; \
556 SHOW_BIND(32) 947 SHOW_BIND(32)
557 SHOW_BIND(64) 948 SHOW_BIND(64)
558 949
559 if (be_wewy_wewy_quiet) return NULL; 950 if (be_wewy_wewy_quiet) return NULL;
560 951
952 /* don't output anything if quiet mode and the ELF is static or not setuid */
561 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 953 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
562 return NULL; 954 return NULL;
563 } else { 955 } else {
564 *found_bind = 1; 956 *found_bind = 1;
565 return (char *) "LAZY"; 957 return (char *)(dynamic ? "LAZY" : "STATIC");
566 } 958 }
567} 959}
568static char *scanelf_file_soname(elfobj *elf, char *found_soname) 960static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569{ 961{
570 unsigned long i; 962 unsigned long i;
582 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 974 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
583 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 975 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
584 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 976 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
585 Elf ## B ## _Off offset; \ 977 Elf ## B ## _Off offset; \
586 /* only look for soname in shared objects */ \ 978 /* only look for soname in shared objects */ \
587 if (ehdr->e_type != ET_DYN) \ 979 if (EGET(ehdr->e_type) != ET_DYN) \
588 return NULL; \ 980 return NULL; \
589 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 981 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
590 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 982 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
591 offset = EGET(phdr[i].p_offset); \ 983 offset = EGET(phdr[i].p_offset); \
592 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 984 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
593 dyn = DYN ## B (elf->data + offset); \ 985 dyn = DYN ## B (elf->vdata + offset); \
594 while (EGET(dyn->d_tag) != DT_NULL) { \ 986 while (EGET(dyn->d_tag) != DT_NULL) { \
595 if (EGET(dyn->d_tag) == DT_SONAME) { \ 987 if (EGET(dyn->d_tag) == DT_SONAME) { \
596 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 988 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
597 if (offset >= (Elf ## B ## _Off)elf->len) { \ 989 if (offset >= (Elf ## B ## _Off)elf->len) { \
598 ++dyn; \ 990 ++dyn; \
599 continue; \ 991 continue; \
600 } \ 992 } \
601 soname = (char*)(elf->data + offset); \ 993 soname = elf->data + offset; \
602 *found_soname = 1; \ 994 *found_soname = 1; \
603 return (be_wewy_wewy_quiet ? NULL : soname); \ 995 return (be_wewy_wewy_quiet ? NULL : soname); \
604 } \ 996 } \
605 ++dyn; \ 997 ++dyn; \
606 } \ 998 } \
609 SHOW_SONAME(64) 1001 SHOW_SONAME(64)
610 } 1002 }
611 1003
612 return NULL; 1004 return NULL;
613} 1005}
1006
1007/*
1008 * We support the symbol form:
1009 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1010 * If the symbol name is empty, then all symbols are matched.
1011 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1012 * Do not rely on this output format at all.
1013 * Otherwise the symbol name is used to search (either regex or string compare).
1014 * If the first char of the symbol name is a plus ("+"), then only match
1015 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1016 * Putting modifiers in between the percent signs allows for more in depth
1017 * filters. There are groups of modifiers. If you don't specify a member
1018 * of a group, then all types in that group are matched. The current
1019 * groups and their types are:
1020 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
1021 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1022 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1023 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1024 * You can search for multiple symbols at once by seperating with a comma (",").
1025 *
1026 * Some examples:
1027 * ELFs with a weak function "foo":
1028 * scanelf -s %wf%foo <ELFs>
1029 * ELFs that define the symbol "main":
1030 * scanelf -s +main <ELFs>
1031 * scanelf -s %d%main <ELFs>
1032 * ELFs that refer to the undefined symbol "brk":
1033 * scanelf -s -brk <ELFs>
1034 * scanelf -s %u%brk <ELFs>
1035 * All global defined objects in an ELF:
1036 * scanelf -s %ogd% <ELF>
1037 */
1038static void
1039scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1040 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1041{
1042 char *this_sym, *next_sym, saved = saved;
1043
1044 /* allow the user to specify a comma delimited list of symbols to search for */
1045 next_sym = NULL;
1046 do {
1047 bool inc_notype, inc_object, inc_func, inc_file,
1048 inc_local, inc_global, inc_weak,
1049 inc_def, inc_undef, inc_abs, inc_common;
1050
1051 if (next_sym) {
1052 next_sym[-1] = saved;
1053 this_sym = next_sym;
1054 } else
1055 this_sym = find_sym;
1056 if ((next_sym = strchr(this_sym, ','))) {
1057 /* make parsing easier by killing the comma temporarily */
1058 saved = *next_sym;
1059 *next_sym = '\0';
1060 next_sym += 1;
1061 }
1062
1063 /* symbol selection! */
1064 inc_notype = inc_object = inc_func = inc_file = \
1065 inc_local = inc_global = inc_weak = \
1066 inc_def = inc_undef = inc_abs = inc_common = \
1067 (*this_sym != '%');
1068
1069 /* parse the contents of %...% */
1070 if (!inc_notype) {
1071 while (*(this_sym++)) {
1072 if (*this_sym == '%') {
1073 ++this_sym;
1074 break;
1075 }
1076 switch (*this_sym) {
1077 case 'n': inc_notype = true; break;
1078 case 'o': inc_object = true; break;
1079 case 'f': inc_func = true; break;
1080 case 'F': inc_file = true; break;
1081 case 'l': inc_local = true; break;
1082 case 'g': inc_global = true; break;
1083 case 'w': inc_weak = true; break;
1084 case 'd': inc_def = true; break;
1085 case 'u': inc_undef = true; break;
1086 case 'a': inc_abs = true; break;
1087 case 'c': inc_common = true; break;
1088 default: err("invalid symbol selector '%c'", *this_sym);
1089 }
1090 }
1091
1092 /* If no types are matched, not match all */
1093 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1094 inc_notype = inc_object = inc_func = inc_file = true;
1095 if (!inc_local && !inc_global && !inc_weak)
1096 inc_local = inc_global = inc_weak = true;
1097 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1098 inc_def = inc_undef = inc_abs = inc_common = true;
1099
1100 /* backwards compat for defined/undefined short hand */
1101 } else if (*this_sym == '+') {
1102 inc_undef = false;
1103 ++this_sym;
1104 } else if (*this_sym == '-') {
1105 inc_def = inc_abs = inc_common = false;
1106 ++this_sym;
1107 }
1108
1109 /* filter symbols */
1110 if ((!inc_notype && stt == STT_NOTYPE) || \
1111 (!inc_object && stt == STT_OBJECT) || \
1112 (!inc_func && stt == STT_FUNC ) || \
1113 (!inc_file && stt == STT_FILE ) || \
1114 (!inc_local && stb == STB_LOCAL ) || \
1115 (!inc_global && stb == STB_GLOBAL) || \
1116 (!inc_weak && stb == STB_WEAK ) || \
1117 (!inc_def && shn && shn < SHN_LORESERVE) || \
1118 (!inc_undef && shn == SHN_UNDEF ) || \
1119 (!inc_abs && shn == SHN_ABS ) || \
1120 (!inc_common && shn == SHN_COMMON))
1121 continue;
1122
1123 if (*this_sym == '*') {
1124 /* a "*" symbol gets you debug output */
1125 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1126 ((*found_sym == 0) ? "\n\t" : "\t"),
1127 elf->base_filename,
1128 size,
1129 get_elfstttype(stt),
1130 get_elfstbtype(stb),
1131 get_elfshntype(shn),
1132 symname);
1133 goto matched;
1134
1135 } else {
1136 if (g_match) {
1137 /* regex match the symbol */
1138 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1139 continue;
1140
1141 } else if (*this_sym) {
1142 /* give empty symbols a "pass", else do a normal compare */
1143 const size_t len = strlen(this_sym);
1144 if (!(strncmp(this_sym, symname, len) == 0 &&
1145 /* Accept unversioned symbol names */
1146 (symname[len] == '\0' || symname[len] == '@')))
1147 continue;
1148 }
1149
1150 if (be_semi_verbose) {
1151 char buf[1024];
1152 snprintf(buf, sizeof(buf), "%lX %s %s",
1153 size,
1154 get_elfstttype(stt),
1155 this_sym);
1156 *ret = xstrdup(buf);
1157 } else {
1158 if (*ret) xchrcat(ret, ',', ret_len);
1159 xstrcat(ret, symname, ret_len);
1160 }
1161
1162 goto matched;
1163 }
1164 } while (next_sym);
1165
1166 return;
1167
1168 matched:
1169 *found_sym = 1;
1170 if (next_sym)
1171 next_sym[-1] = saved;
1172}
1173
614static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1174static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
615{ 1175{
616 unsigned long i; 1176 unsigned long i;
1177 char *ret;
617 void *symtab_void, *strtab_void; 1178 void *symtab_void, *strtab_void;
618 1179
619 if (!find_sym) return NULL; 1180 if (!find_sym) return NULL;
1181 ret = NULL;
620 1182
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1183 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622 1184
623 if (symtab_void && strtab_void) { 1185 if (symtab_void && strtab_void) {
624#define FIND_SYM(B) \ 1186#define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \ 1187 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1188 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1189 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1190 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1191 unsigned long cnt = EGET(symtab->sh_entsize); \
630 char *symname; \ 1192 char *symname; \
1193 size_t ret_len = 0; \
1194 if (cnt) \
1195 cnt = EGET(symtab->sh_size) / cnt; \
631 for (i = 0; i < cnt; ++i) { \ 1196 for (i = 0; i < cnt; ++i) { \
1197 if ((void*)sym > elf->data_end) { \
1198 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1199 goto break_out; \
1200 } \
632 if (sym->st_name) { \ 1201 if (sym->st_name) { \
1202 /* make sure the symbol name is in acceptable memory range */ \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1203 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
634 if (*find_sym == '*') { \ 1204 if ((void*)symname > elf->data_end) { \
635 printf("%s(%s) %5lX %15s %s\n", \ 1205 warnf("%s: corrupt ELF symbols", elf->filename); \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1206 ++sym; \
637 elf->base_filename, \ 1207 continue; \
638 (long)sym->st_size, \ 1208 } \
639 (char *)get_elfstttype(sym->st_info), \ 1209 scanelf_match_symname(elf, found_sym, \
640 symname); \ 1210 &ret, &ret_len, symname, \
641 *found_sym = 1; \ 1211 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
642 } else if ((strcmp(find_sym, symname) == 0) || \ 1212 ELF##B##_ST_BIND(EGET(sym->st_info)), \
643 (strcmp(symname, versioned_symname) == 0)) \ 1213 EGET(sym->st_shndx), \
644 (*found_sym)++; \ 1214 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1215 EGET(sym->st_size)); \
645 } \ 1216 } \
646 ++sym; \ 1217 ++sym; \
647 } } 1218 } }
648 FIND_SYM(32) 1219 FIND_SYM(32)
649 FIND_SYM(64) 1220 FIND_SYM(64)
650 } 1221 }
651 1222
1223break_out:
652 if (be_wewy_wewy_quiet) return NULL; 1224 if (be_wewy_wewy_quiet) return NULL;
653 1225
654 if (*find_sym != '*' && *found_sym) 1226 if (*find_sym != '*' && *found_sym)
655 return find_sym; 1227 return ret;
656 if (be_quiet) 1228 if (be_quiet)
657 return NULL; 1229 return NULL;
658 else 1230 else
659 return (char *)" - "; 1231 return " - ";
660} 1232}
1233
1234static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1235{
1236 if (!find_section)
1237 return NULL;
1238
1239#define FIND_SECTION(B) \
1240 if (elf->elf_class == ELFCLASS ## B) { \
1241 size_t matched, n; \
1242 int invert; \
1243 const char *section_name; \
1244 Elf ## B ## _Shdr *section; \
1245 \
1246 matched = 0; \
1247 array_for_each(find_section_arr, n, section_name) { \
1248 invert = (*section_name == '!' ? 1 : 0); \
1249 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1250 if ((section == NULL && invert) || (section != NULL && !invert)) \
1251 ++matched; \
1252 } \
1253 \
1254 if (matched == array_cnt(find_section_arr)) \
1255 *found_section = 1; \
1256 }
1257 FIND_SECTION(32)
1258 FIND_SECTION(64)
1259
1260 if (be_wewy_wewy_quiet)
1261 return NULL;
1262
1263 if (*found_section)
1264 return find_section;
1265
1266 if (be_quiet)
1267 return NULL;
1268 else
1269 return " - ";
1270}
1271
661/* scan an elf file and show all the fun stuff */ 1272/* scan an elf file and show all the fun stuff */
662#define prints(str) write(fileno(stdout), str, strlen(str)) 1273#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
663static void scanelf_file(const char *filename) 1274static int scanelf_elfobj(elfobj *elf)
664{ 1275{
665 unsigned long i; 1276 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1277 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname, 1278 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels; 1279 found_sym, found_lib, found_file, found_textrels, found_section;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL; 1280 static char *out_buffer = NULL;
672 static size_t out_len; 1281 static size_t out_len;
673 1282
674 /* make sure 'filename' exists */
675 if (lstat(filename, &st) == -1) {
676 if (be_verbose > 2) printf("%s: does not exist\n", filename);
677 return;
678 }
679 /* always handle regular files and handle symlinked files if no -y */
680 if (S_ISLNK(st.st_mode)) {
681 if (!scan_symlink) return;
682 stat(filename, &st);
683 }
684 if (!S_ISREG(st.st_mode)) {
685 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
686 return;
687 }
688
689 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1283 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1284 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0; 1285 found_sym = found_lib = found_file = found_textrels = found_section = 0;
692 1286
693 /* verify this is real ELF */
694 if ((elf = readelf(filename)) == NULL) {
695 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
696 return;
697 }
698
699 if (be_verbose > 1) 1287 if (be_verbose > 2)
700 printf("%s: scanning file {%s,%s}\n", filename, 1288 printf("%s: scanning file {%s,%s}\n", elf->filename,
701 get_elfeitype(EI_CLASS, elf->elf_class), 1289 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1290 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose) 1291 else if (be_verbose > 1)
704 printf("%s: scanning file\n", filename); 1292 printf("%s: scanning file\n", elf->filename);
705 1293
706 /* init output buffer */ 1294 /* init output buffer */
707 if (!out_buffer) { 1295 if (!out_buffer) {
708 out_len = sizeof(char) * 80; 1296 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len); 1297 out_buffer = xmalloc(out_len);
710 } 1298 }
711 *out_buffer = '\0'; 1299 *out_buffer = '\0';
712 1300
713 /* show the header */ 1301 /* show the header */
714 if (!be_quiet && show_banner) { 1302 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) { 1303 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue; 1304 if (!IS_MODIFIER(out_format[i])) continue;
717 1305
718 switch (out_format[++i]) { 1306 switch (out_format[++i]) {
1307 case '+': break;
719 case '%': break; 1308 case '%': break;
720 case '#': break; 1309 case '#': break;
721 case 'F': 1310 case 'F':
722 case 'p': 1311 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break; 1312 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break; 1313 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break; 1314 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break; 1315 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break; 1316 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break; 1317 case 'r': prints("RPATH "); break;
1318 case 'M': prints("CLASS "); break;
729 case 'n': prints("NEEDED "); break; 1319 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break; 1320 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break; 1321 case 'b': prints("BIND "); break;
1322 case 'Z': prints("SIZE "); break;
732 case 'S': prints("SONAME "); break; 1323 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break; 1324 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break; 1325 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break; 1326 case 'T': prints("TEXTRELS "); break;
1327 case 'k': prints("SECTION "); break;
1328 case 'a': prints("ARCH "); break;
1329 case 'I': prints("OSABI "); break;
1330 case 'Y': prints("EABI "); break;
1331 case 'O': prints("PERM "); break;
1332 case 'D': prints("ENDIAN "); break;
736 default: warnf("'%c' has no title ?", out_format[i]); 1333 default: warnf("'%c' has no title ?", out_format[i]);
737 } 1334 }
738 } 1335 }
739 if (!found_file) prints("FILE "); 1336 if (!found_file) prints("FILE ");
740 prints("\n"); 1337 prints("\n");
744 1341
745 /* dump all the good stuff */ 1342 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) { 1343 for (i = 0; out_format[i]; ++i) {
747 const char *out; 1344 const char *out;
748 const char *tmp; 1345 const char *tmp;
749 1346 static char ubuf[sizeof(unsigned long)*2];
750 /* make sure we trim leading spaces in quiet mode */
751 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
752 *out_buffer = '\0';
753
754 if (!IS_MODIFIER(out_format[i])) { 1347 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len); 1348 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue; 1349 continue;
757 } 1350 }
758 1351
759 out = NULL; 1352 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#'); 1353 be_wewy_wewy_quiet = (out_format[i] == '#');
1354 be_semi_verbose = (out_format[i] == '+');
761 switch (out_format[++i]) { 1355 switch (out_format[++i]) {
1356 case '+':
762 case '%': 1357 case '%':
763 case '#': 1358 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break; 1359 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F': 1360 case 'F':
766 found_file = 1; 1361 found_file = 1;
767 if (be_wewy_wewy_quiet) break; 1362 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len); 1363 xstrcat(&out_buffer, elf->filename, &out_len);
769 break; 1364 break;
770 case 'p': 1365 case 'p':
771 found_file = 1; 1366 found_file = 1;
772 if (be_wewy_wewy_quiet) break; 1367 if (be_wewy_wewy_quiet) break;
773 tmp = filename; 1368 tmp = elf->filename;
774 if (search_path) { 1369 if (search_path) {
775 ssize_t len_search = strlen(search_path); 1370 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename); 1371 ssize_t len_file = strlen(elf->filename);
777 if (!strncmp(filename, search_path, len_search) && \ 1372 if (!strncmp(elf->filename, search_path, len_search) && \
778 len_file > len_search) 1373 len_file > len_search)
779 tmp += len_search; 1374 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1375 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 } 1376 }
782 xstrcat(&out_buffer, tmp, &out_len); 1377 xstrcat(&out_buffer, tmp, &out_len);
783 break; 1378 break;
784 case 'f': 1379 case 'f':
785 found_file = 1; 1380 found_file = 1;
786 if (be_wewy_wewy_quiet) break; 1381 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/'); 1382 tmp = strrchr(elf->filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1); 1383 tmp = (tmp == NULL ? elf->filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len); 1384 xstrcat(&out_buffer, tmp, &out_len);
790 break; 1385 break;
791 case 'o': out = get_elfetype(elf); break; 1386 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1387 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
793 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1388 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
794 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1389 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1390 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
796 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1391 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1392 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1393 case 'D': out = get_endian(elf); break;
1394 case 'O': out = strfileperms(elf->filename); break;
797 case 'n': 1395 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1396 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
799 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1397 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1398 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1399 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1400 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1401 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1402 case 'a': out = get_elfemtype(elf); break;
1403 case 'I': out = get_elfosabi(elf); break;
1404 case 'Y': out = get_elf_eabi(elf); break;
1405 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
803 default: warnf("'%c' has no scan code?", out_format[i]); 1406 default: warnf("'%c' has no scan code?", out_format[i]);
804 } 1407 }
1408 if (out)
805 if (out) xstrcat(&out_buffer, out, &out_len); 1409 xstrcat(&out_buffer, out, &out_len);
806 } 1410 }
807 1411
808#define FOUND_SOMETHING() \ 1412#define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1413 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \ 1414 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels) 1415 found_soname || found_sym || found_lib || found_textrels || found_section )
812 1416
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1417 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len); 1418 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len); 1419 xstrcat(&out_buffer, elf->filename, &out_len);
816 } 1420 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1421 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer); 1422 puts(out_buffer);
819 fflush(stdout); 1423 fflush(stdout);
820 } 1424 }
821 1425
1426 return 0;
1427}
1428
1429/* scan a single elf */
1430static int scanelf_elf(const char *filename, int fd, size_t len)
1431{
1432 int ret = 1;
1433 elfobj *elf;
1434
1435 /* verify this is real ELF */
1436 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1437 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1438 return ret;
1439 }
1440 switch (match_bits) {
1441 case 32:
1442 if (elf->elf_class != ELFCLASS32)
1443 goto label_done;
1444 break;
1445 case 64:
1446 if (elf->elf_class != ELFCLASS64)
1447 goto label_done;
1448 break;
1449 default: break;
1450 }
1451 if (strlen(match_etypes)) {
1452 char sbuf[126];
1453 strncpy(sbuf, match_etypes, sizeof(sbuf));
1454 if (strchr(match_etypes, ',') != NULL) {
1455 char *p;
1456 while ((p = strrchr(sbuf, ',')) != NULL) {
1457 *p = 0;
1458 if (etype_lookup(p+1) == get_etype(elf))
1459 goto label_ret;
1460 }
1461 }
1462 if (etype_lookup(sbuf) != get_etype(elf))
1463 goto label_done;
1464 }
1465
1466label_ret:
1467 ret = scanelf_elfobj(elf);
1468
1469label_done:
822 unreadelf(elf); 1470 unreadelf(elf);
1471 return ret;
1472}
1473
1474/* scan an archive of elfs */
1475static int scanelf_archive(const char *filename, int fd, size_t len)
1476{
1477 archive_handle *ar;
1478 archive_member *m;
1479 char *ar_buffer;
1480 elfobj *elf;
1481
1482 ar = ar_open_fd(filename, fd);
1483 if (ar == NULL)
1484 return 1;
1485
1486 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1487 while ((m = ar_next(ar)) != NULL) {
1488 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1489 if (cur_pos == -1)
1490 errp("lseek() failed");
1491 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1492 if (elf) {
1493 scanelf_elfobj(elf);
1494 unreadelf(elf);
1495 }
1496 }
1497 munmap(ar_buffer, len);
1498
1499 return 0;
1500}
1501/* scan a file which may be an elf or an archive or some other magical beast */
1502static int scanelf_file(const char *filename, const struct stat *st_cache)
1503{
1504 const struct stat *st = st_cache;
1505 struct stat symlink_st;
1506 int fd;
1507
1508 /* always handle regular files and handle symlinked files if no -y */
1509 if (S_ISLNK(st->st_mode)) {
1510 if (!scan_symlink) return 1;
1511 stat(filename, &symlink_st);
1512 st = &symlink_st;
1513 }
1514
1515 if (!S_ISREG(st->st_mode)) {
1516 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1517 return 1;
1518 }
1519
1520 if (match_perms) {
1521 if ((st->st_mode | match_perms) != st->st_mode)
1522 return 1;
1523 }
1524 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1525 return 1;
1526
1527 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1528 /* if it isn't an ELF, maybe it's an .a archive */
1529 scanelf_archive(filename, fd, st->st_size);
1530
1531 close(fd);
1532 return 0;
1533}
1534
1535static const char *maybe_add_root(const char *fname, char *buf)
1536{
1537 if (root && strncmp(fname, root, strlen(root))) {
1538 strcpy(buf, root);
1539 strncat(buf, fname, __PAX_UTILS_PATH_MAX - strlen(root) - 1);
1540 fname = buf;
1541 }
1542 return fname;
823} 1543}
824 1544
825/* scan a directory for ET_EXEC files and print when we find one */ 1545/* scan a directory for ET_EXEC files and print when we find one */
826static void scanelf_dir(const char *path) 1546static int scanelf_dir(const char *path)
827{ 1547{
828 register DIR *dir; 1548 register DIR *dir;
829 register struct dirent *dentry; 1549 register struct dirent *dentry;
830 struct stat st_top, st; 1550 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX]; 1551 char buf[__PAX_UTILS_PATH_MAX];
1552 char _path[__PAX_UTILS_PATH_MAX];
832 size_t pathlen = 0, len = 0; 1553 size_t pathlen = 0, len = 0;
1554 int ret = 0;
1555
1556 path = maybe_add_root(path, _path);
833 1557
834 /* make sure path exists */ 1558 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) { 1559 if (lstat(path, &st_top) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path); 1560 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return; 1561 return 1;
838 } 1562 }
839 1563
840 /* ok, if it isn't a directory, assume we can open it */ 1564 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) { 1565 if (!S_ISDIR(st_top.st_mode)) {
842 scanelf_file(path); 1566 return scanelf_file(path, &st_top);
843 return;
844 } 1567 }
845 1568
846 /* now scan the dir looking for fun stuff */ 1569 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) { 1570 if ((dir = opendir(path)) == NULL) {
848 warnf("could not opendir %s: %s", path, strerror(errno)); 1571 warnf("could not opendir %s: %s", path, strerror(errno));
849 return; 1572 return 1;
850 } 1573 }
851 if (be_verbose) printf("%s: scanning dir\n", path); 1574 if (be_verbose > 1) printf("%s: scanning dir\n", path);
852 1575
853 pathlen = strlen(path); 1576 pathlen = strlen(path);
854 while ((dentry = readdir(dir))) { 1577 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1578 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue; 1579 continue;
858 if (len >= sizeof(buf)) { 1581 if (len >= sizeof(buf)) {
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1582 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
860 (unsigned long)len, (unsigned long)sizeof(buf)); 1583 (unsigned long)len, (unsigned long)sizeof(buf));
861 continue; 1584 continue;
862 } 1585 }
863 sprintf(buf, "%s/%s", path, dentry->d_name); 1586 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
864 if (lstat(buf, &st) != -1) { 1587 if (lstat(buf, &st) != -1) {
865 if (S_ISREG(st.st_mode)) 1588 if (S_ISREG(st.st_mode))
866 scanelf_file(buf); 1589 ret = scanelf_file(buf, &st);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1590 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1591 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf); 1592 ret = scanelf_dir(buf);
870 } 1593 }
871 } 1594 }
872 } 1595 }
873 closedir(dir); 1596 closedir(dir);
1597 return ret;
874} 1598}
875 1599
876static int scanelf_from_file(char *filename) 1600static int scanelf_from_file(const char *filename)
877{ 1601{
878 FILE *fp = NULL; 1602 FILE *fp = NULL;
879 char *p; 1603 char *p;
880 char path[_POSIX_PATH_MAX]; 1604 char path[__PAX_UTILS_PATH_MAX];
1605 int ret = 0;
881 1606
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1607 if (strcmp(filename, "-") == 0)
883 fp = stdin; 1608 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL) 1609 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1; 1610 return 1;
886 1611
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1612 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
888 if ((p = strchr(path, '\n')) != NULL) 1613 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0; 1614 *p = 0;
890 search_path = path; 1615 search_path = path;
891 scanelf_dir(path); 1616 ret = scanelf_dir(path);
892 } 1617 }
893 if (fp != stdin) 1618 if (fp != stdin)
894 fclose(fp); 1619 fclose(fp);
895 return 0; 1620 return ret;
896} 1621}
897 1622
898static void load_ld_so_conf() 1623#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1624
1625static int load_ld_cache_config(int i, const char *fname)
899{ 1626{
900 FILE *fp = NULL; 1627 FILE *fp = NULL;
901 char *p; 1628 char *p;
902 char path[_POSIX_PATH_MAX]; 1629 char path[__PAX_UTILS_PATH_MAX];
903 int i = 0; 1630 char _fname[__PAX_UTILS_PATH_MAX];
904 1631
1632 fname = maybe_add_root(fname, _fname);
1633
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1634 if ((fp = fopen(fname, "r")) == NULL)
906 return; 1635 return i;
907 1636
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1637 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
909 if (*path != '/')
910 continue;
911
912 if ((p = strrchr(path, '\r')) != NULL) 1638 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0; 1639 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL) 1640 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0; 1641 *p = 0;
916 1642
917 ldpaths[i++] = xstrdup(path); 1643 /* recursive includes of the same file will make this segfault. */
1644 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1645 glob_t gl;
1646 size_t x;
1647 char gpath[__PAX_UTILS_PATH_MAX];
918 1648
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1649 memset(gpath, 0, sizeof(gpath));
920 break; 1650 if (root)
1651 strcpy(gpath, root);
1652
1653 if (path[8] != '/')
1654 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1655 else
1656 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1657
1658 if (glob(gpath, 0, NULL, &gl) == 0) {
1659 for (x = 0; x < gl.gl_pathc; ++x) {
1660 /* try to avoid direct loops */
1661 if (strcmp(gl.gl_pathv[x], fname) == 0)
1662 continue;
1663 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1664 }
1665 globfree(&gl);
1666 continue;
1667 }
921 } 1668 }
922 ldpaths[i] = NULL; 1669
1670 if (*path != '/')
1671 continue;
1672
1673 xarraypush(ldpaths, path, strlen(path));
1674 }
923 1675
924 fclose(fp); 1676 fclose(fp);
1677 return i;
925} 1678}
1679
1680#elif defined(__FreeBSD__) || defined(__DragonFly__)
1681
1682static int load_ld_cache_config(int i, const char *fname)
1683{
1684 FILE *fp = NULL;
1685 char *b = NULL, *p;
1686 struct elfhints_hdr hdr;
1687 char _fname[__PAX_UTILS_PATH_MAX];
1688
1689 fname = maybe_add_root(fname, _fname);
1690
1691 if ((fp = fopen(fname, "r")) == NULL)
1692 return i;
1693
1694 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1695 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1696 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1697 {
1698 fclose(fp);
1699 return i;
1700 }
1701
1702 b = xmalloc(hdr.dirlistlen + 1);
1703 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1704 fclose(fp);
1705 free(b);
1706 return i;
1707 }
1708
1709 while ((p = strsep(&b, ":"))) {
1710 if (*p == '\0')
1711 continue;
1712 xarraypush(ldpaths, p, strlen(p));
1713 }
1714
1715 free(b);
1716 fclose(fp);
1717 return i;
1718}
1719
1720#else
1721#ifdef __ELF__
1722#warning Cache config support not implemented for your target
1723#endif
1724static int load_ld_cache_config(int i, const char *fname)
1725{
1726 return 0;
1727}
1728#endif
926 1729
927/* scan /etc/ld.so.conf for paths */ 1730/* scan /etc/ld.so.conf for paths */
928static void scanelf_ldpath() 1731static void scanelf_ldpath(void)
929{ 1732{
930 char scan_l, scan_ul, scan_ull; 1733 char scan_l, scan_ul, scan_ull;
1734 size_t n;
1735 const char *ldpath;
931 int i = 0; 1736 int i = 0;
932 1737
933 if (!ldpaths[0]) 1738 if (array_cnt(ldpaths) == 0)
934 err("Unable to load any paths from ld.so.conf"); 1739 err("Unable to load any paths from ld.so.conf");
935 1740
936 scan_l = scan_ul = scan_ull = 0; 1741 scan_l = scan_ul = scan_ull = 0;
937 1742
938 while (ldpaths[i]) { 1743 array_for_each(ldpaths, n, ldpath) {
939 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1744 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
940 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1745 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
941 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1746 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
942 scanelf_dir(ldpaths[i]); 1747 scanelf_dir(ldpath);
943 ++i; 1748 ++i;
944 } 1749 }
945 1750
946 if (!scan_l) scanelf_dir("/lib"); 1751 if (!scan_l) scanelf_dir("/lib");
947 if (!scan_ul) scanelf_dir("/usr/lib"); 1752 if (!scan_ul) scanelf_dir("/usr/lib");
948 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1753 if (!scan_ull) scanelf_dir("/usr/local/lib");
949} 1754}
950 1755
951/* scan env PATH for paths */ 1756/* scan env PATH for paths */
952static void scanelf_envpath() 1757static void scanelf_envpath(void)
953{ 1758{
954 char *path, *p; 1759 char *path, *p;
955 1760
956 path = getenv("PATH"); 1761 path = getenv("PATH");
957 if (!path) 1762 if (!path)
964 } 1769 }
965 1770
966 free(path); 1771 free(path);
967} 1772}
968 1773
969 1774/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
970
971/* usage / invocation handling functions */
972#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1775#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
973#define a_argument required_argument 1776#define a_argument required_argument
974static struct option const long_opts[] = { 1777static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'}, 1778 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'}, 1779 {"ldpath", no_argument, NULL, 'l'},
1780 {"root", a_argument, NULL, 128},
977 {"recursive", no_argument, NULL, 'R'}, 1781 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'}, 1782 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'}, 1783 {"symlink", no_argument, NULL, 'y'},
1784 {"archives", no_argument, NULL, 'A'},
1785 {"ldcache", no_argument, NULL, 'L'},
1786 {"fix", no_argument, NULL, 'X'},
1787 {"setpax", a_argument, NULL, 'z'},
980 {"pax", no_argument, NULL, 'x'}, 1788 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'}, 1789 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'}, 1790 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'}, 1791 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'}, 1792 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'}, 1793 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'}, 1794 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'}, 1795 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'}, 1796 {"symbol", a_argument, NULL, 's'},
1797 {"section", a_argument, NULL, 'k'},
989 {"lib", a_argument, NULL, 'N'}, 1798 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'}, 1799 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'}, 1800 {"textrels", no_argument, NULL, 'T'},
1801 {"etype", a_argument, NULL, 'E'},
1802 {"bits", a_argument, NULL, 'M'},
1803 {"endian", no_argument, NULL, 'D'},
1804 {"osabi", no_argument, NULL, 'I'},
1805 {"eabi", no_argument, NULL, 'Y'},
1806 {"perms", a_argument, NULL, 'O'},
1807 {"size", no_argument, NULL, 'Z'},
992 {"all", no_argument, NULL, 'a'}, 1808 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'}, 1809 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'}, 1810 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'}, 1811 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'}, 1812 {"from", a_argument, NULL, 'f'},
997 {"file", a_argument, NULL, 'o'}, 1813 {"file", a_argument, NULL, 'o'},
1814 {"nocolor", no_argument, NULL, 'C'},
998 {"nobanner", no_argument, NULL, 'B'}, 1815 {"nobanner", no_argument, NULL, 'B'},
999 {"help", no_argument, NULL, 'h'}, 1816 {"help", no_argument, NULL, 'h'},
1000 {"version", no_argument, NULL, 'V'}, 1817 {"version", no_argument, NULL, 'V'},
1001 {NULL, no_argument, NULL, 0x0} 1818 {NULL, no_argument, NULL, 0x0}
1002}; 1819};
1003 1820
1004static const char *opts_help[] = { 1821static const char * const opts_help[] = {
1005 "Scan all directories in PATH environment", 1822 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf", 1823 "Scan all directories in /etc/ld.so.conf",
1824 "Root directory (use with -l or -p)",
1007 "Scan directories recursively", 1825 "Scan directories recursively",
1008 "Don't recursively cross mount points", 1826 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n", 1827 "Don't scan symlinks",
1828 "Scan archives (.a files)",
1829 "Utilize ld.so.cache information (use with -r/-n)",
1830 "Try and 'fix' bad things (use with -r/-e)",
1831 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1010 "Print PaX markings", 1832 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings", 1833 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information", 1834 "Print TEXTREL information",
1013 "Print RPATH information", 1835 "Print RPATH information",
1014 "Print NEEDED information", 1836 "Print NEEDED information",
1015 "Print INTERP information", 1837 "Print INTERP information",
1016 "Print BIND information", 1838 "Print BIND information",
1017 "Print SONAME information", 1839 "Print SONAME information",
1018 "Find a specified symbol", 1840 "Find a specified symbol",
1841 "Find a specified section",
1019 "Find a specified library", 1842 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)", 1843 "Use regex matching rather than string compare (use with -s)",
1021 "Locate cause of TEXTREL", 1844 "Locate cause of TEXTREL",
1022 "Print all scanned info (-x -e -t -r -b)\n", 1845 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1846 "Print only ELF files matching numeric bits",
1847 "Print Endianness",
1848 "Print OSABI",
1849 "Print EABI (EM_ARM Only)",
1850 "Print only ELF files matching octal permissions",
1851 "Print ELF file size",
1852 "Print all useful/simple info\n",
1023 "Only output 'bad' things", 1853 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)", 1854 "Be verbose (can be specified more than once)",
1025 "Use specified format for output", 1855 "Use specified format for output",
1026 "Read input stream from a filename", 1856 "Read input stream from a filename",
1027 "Write output stream to a filename", 1857 "Write output stream to a filename",
1858 "Don't emit color in output",
1028 "Don't display the header", 1859 "Don't display the header",
1029 "Print this help and exit", 1860 "Print this help and exit",
1030 "Print version and exit", 1861 "Print version and exit",
1031 NULL 1862 NULL
1032}; 1863};
1034/* display usage and exit */ 1865/* display usage and exit */
1035static void usage(int status) 1866static void usage(int status)
1036{ 1867{
1037 unsigned long i; 1868 unsigned long i;
1038 printf("* Scan ELF binaries for stuff\n\n" 1869 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1870 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS); 1871 printf("Options: -[%s]\n", PARSE_FLAGS);
1041 for (i = 0; long_opts[i].name; ++i) 1872 for (i = 0; long_opts[i].name; ++i)
1042 if (long_opts[i].has_arg == no_argument) 1873 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1874 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1875 long_opts[i].name, opts_help[i]);
1876 else if (long_opts[i].val > '~')
1877 printf(" --%-7s <arg> * %s\n",
1044 long_opts[i].name, opts_help[i]); 1878 long_opts[i].name, opts_help[i]);
1045 else 1879 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1880 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]); 1881 long_opts[i].name, opts_help[i]);
1048 1882
1049 if (status != EXIT_SUCCESS) 1883 puts("\nFor more information, see the scanelf(1) manpage");
1050 exit(status);
1051
1052 puts("\nThe format modifiers for the -F option are:");
1053 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1054 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1055 puts(" i INTERP \tb BIND \ts symbol");
1056 puts(" N library \to Type \tT TEXTRELs");
1057 puts(" S SONAME");
1058 puts(" p filename (with search path removed)");
1059 puts(" f filename (short name/basename)");
1060 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1061
1062 exit(status); 1884 exit(status);
1063} 1885}
1064 1886
1065/* parse command line arguments and preform needed actions */ 1887/* parse command line arguments and preform needed actions */
1888#define do_pax_state(option, flag) \
1889 if (islower(option)) { \
1890 flags &= ~PF_##flag; \
1891 flags |= PF_NO##flag; \
1892 } else { \
1893 flags &= ~PF_NO##flag; \
1894 flags |= PF_##flag; \
1895 }
1066static void parseargs(int argc, char *argv[]) 1896static int parseargs(int argc, char *argv[])
1067{ 1897{
1068 int i; 1898 int i;
1069 char *from_file = NULL; 1899 const char *from_file = NULL;
1900 int ret = 0;
1070 1901
1071 opterr = 0; 1902 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1903 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) { 1904 switch (i) {
1074 1905
1078 VERSION, __FILE__, __DATE__, rcsid, argv0); 1909 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS); 1910 exit(EXIT_SUCCESS);
1080 break; 1911 break;
1081 case 'h': usage(EXIT_SUCCESS); break; 1912 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f': 1913 case 'f':
1083 if (from_file) err("Don't specify -f twice"); 1914 if (from_file) warn("You prob don't want to specify -f twice");
1084 from_file = xstrdup(optarg); 1915 from_file = optarg;
1916 break;
1917 case 'E':
1918 strncpy(match_etypes, optarg, sizeof(match_etypes));
1919 break;
1920 case 'M':
1921 match_bits = atoi(optarg);
1922 if (match_bits == 0) {
1923 if (strcmp(optarg, "ELFCLASS32") == 0)
1924 match_bits = 32;
1925 if (strcmp(optarg, "ELFCLASS64") == 0)
1926 match_bits = 64;
1927 }
1928 break;
1929 case 'O':
1930 if (sscanf(optarg, "%o", &match_perms) == -1)
1931 match_bits = 0;
1085 break; 1932 break;
1086 case 'o': { 1933 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1934 if (freopen(optarg, "w", stdout) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1935 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1090 SET_STDOUT(fp);
1091 break; 1936 break;
1092 } 1937 }
1093 1938 case 'k':
1939 xarraypush(find_section_arr, optarg, strlen(optarg));
1940 break;
1094 case 's': { 1941 case 's': {
1095 size_t len;
1096 if (find_sym) err("Don't specify -s twice"); 1942 if (find_sym) warn("You prob don't want to specify -s twice");
1097 find_sym = xstrdup(optarg); 1943 find_sym = optarg;
1098 len = strlen(find_sym) + 1;
1099 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1100 sprintf(versioned_symname, "%s@", find_sym);
1101 break; 1944 break;
1102 } 1945 }
1103 case 'N': { 1946 case 'N':
1104 if (find_lib) err("Don't specify -N twice"); 1947 xarraypush(find_lib_arr, optarg, strlen(optarg));
1105 find_lib = xstrdup(optarg);
1106 break; 1948 break;
1107 }
1108
1109 case 'F': { 1949 case 'F': {
1110 if (out_format) err("Don't specify -F twice"); 1950 if (out_format) warn("You prob don't want to specify -F twice");
1111 out_format = xstrdup(optarg); 1951 out_format = optarg;
1112 break; 1952 break;
1113 } 1953 }
1954 case 'z': {
1955 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1956 size_t x;
1114 1957
1958 for (x = 0; x < strlen(optarg); x++) {
1959 switch (optarg[x]) {
1960 case 'p':
1961 case 'P':
1962 do_pax_state(optarg[x], PAGEEXEC);
1963 break;
1964 case 's':
1965 case 'S':
1966 do_pax_state(optarg[x], SEGMEXEC);
1967 break;
1968 case 'm':
1969 case 'M':
1970 do_pax_state(optarg[x], MPROTECT);
1971 break;
1972 case 'e':
1973 case 'E':
1974 do_pax_state(optarg[x], EMUTRAMP);
1975 break;
1976 case 'r':
1977 case 'R':
1978 do_pax_state(optarg[x], RANDMMAP);
1979 break;
1980 case 'x':
1981 case 'X':
1982 do_pax_state(optarg[x], RANDEXEC);
1983 break;
1984 default:
1985 break;
1986 }
1987 }
1988 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1989 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1990 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1991 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1992 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1993 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1994 setpax = flags;
1995 break;
1996 }
1997 case 'Z': show_size = 1; break;
1115 case 'g': gmatch = 1; 1998 case 'g': g_match = 1; break;
1999 case 'L': use_ldcache = 1; break;
1116 case 'y': scan_symlink = 0; break; 2000 case 'y': scan_symlink = 0; break;
2001 case 'A': scan_archives = 1; break;
2002 case 'C': color_init(true); break;
1117 case 'B': show_banner = 0; break; 2003 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break; 2004 case 'l': scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break; 2005 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break; 2006 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break; 2007 case 'm': dir_crossmount = 0; break;
2008 case 'X': ++fix_elf; break;
1122 case 'x': show_pax = 1; break; 2009 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break; 2010 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break; 2011 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break; 2012 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break; 2013 case 'n': show_needed = 1; break;
1128 case 'b': show_bind = 1; break; 2015 case 'b': show_bind = 1; break;
1129 case 'S': show_soname = 1; break; 2016 case 'S': show_soname = 1; break;
1130 case 'T': show_textrels = 1; break; 2017 case 'T': show_textrels = 1; break;
1131 case 'q': be_quiet = 1; break; 2018 case 'q': be_quiet = 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2019 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2020 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1134 2021 case 'D': show_endian = 1; break;
2022 case 'I': show_osabi = 1; break;
2023 case 'Y': show_eabi = 1; break;
2024 case 128:
2025 root = optarg;
2026 break;
1135 case ':': 2027 case ':':
1136 err("Option missing parameter\n"); 2028 err("Option '%c' is missing parameter", optopt);
1137 case '?': 2029 case '?':
1138 err("Unknown option\n"); 2030 err("Unknown option '%c' or argument missing", optopt);
1139 default: 2031 default:
1140 err("Unhandled option '%c'", i); 2032 err("Unhandled option '%c'; please report this", i);
1141 }
1142 } 2033 }
1143 2034 }
2035 if (show_textrels && be_verbose) {
2036 if (which("objdump") != NULL)
2037 has_objdump = 1;
2038 }
2039 /* flatten arrays for display */
2040 if (array_cnt(find_lib_arr))
2041 find_lib = array_flatten_str(find_lib_arr);
2042 if (array_cnt(find_section_arr))
2043 find_section = array_flatten_str(find_section_arr);
1144 /* let the format option override all other options */ 2044 /* let the format option override all other options */
1145 if (out_format) { 2045 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \ 2046 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \ 2047 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0; 2048 show_textrels = show_perms = show_endian = show_size = \
2049 show_osabi = show_eabi = 0;
1149 for (i = 0; out_format[i]; ++i) { 2050 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue; 2051 if (!IS_MODIFIER(out_format[i])) continue;
1151 2052
1152 switch (out_format[++i]) { 2053 switch (out_format[++i]) {
2054 case '+': break;
1153 case '%': break; 2055 case '%': break;
1154 case '#': break; 2056 case '#': break;
1155 case 'F': break; 2057 case 'F': break;
1156 case 'p': break; 2058 case 'p': break;
1157 case 'f': break; 2059 case 'f': break;
2060 case 'k': break;
1158 case 's': break; 2061 case 's': break;
1159 case 'N': break; 2062 case 'N': break;
1160 case 'o': break; 2063 case 'o': break;
2064 case 'a': break;
2065 case 'M': break;
2066 case 'Z': show_size = 1; break;
2067 case 'D': show_endian = 1; break;
2068 case 'I': show_osabi = 1; break;
2069 case 'Y': show_eabi = 1; break;
2070 case 'O': show_perms = 1; break;
1161 case 'x': show_pax = 1; break; 2071 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break; 2072 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break; 2073 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break; 2074 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break; 2075 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break; 2076 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break; 2077 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break; 2078 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break; 2079 case 'T': show_textrels = 1; break;
1170 default: 2080 default:
1171 err("Invalid format specifier '%c' (byte %i)", 2081 err("Invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1); 2082 out_format[i], i+1);
1173 } 2083 }
1174 } 2084 }
1175 2085
1176 /* construct our default format */ 2086 /* construct our default format */
1177 } else { 2087 } else {
1178 size_t fmt_len = 30; 2088 size_t fmt_len = 30;
1179 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2089 out_format = xmalloc(sizeof(char) * fmt_len);
2090 *out_format = '\0';
1180 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2091 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1181 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2092 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2093 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2094 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2095 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2096 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2097 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1182 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2098 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1183 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2099 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1184 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2100 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1185 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2101 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2102 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2103 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2104 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2105 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2106 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2107 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2108 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2109 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 } 2110 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format); 2111 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195 2112
1196 /* now lets actually do the scanning */ 2113 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet)) 2114 if (scan_ldpath || use_ldcache)
1198 load_ld_so_conf(); 2115 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1199 if (scan_ldpath) scanelf_ldpath(); 2116 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath(); 2117 if (scan_envpath) scanelf_envpath();
2118 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2119 from_file = "-";
1201 if (from_file) { 2120 if (from_file) {
1202 scanelf_from_file(from_file); 2121 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv; 2122 from_file = *argv;
1205 } 2123 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2124 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?"); 2125 err("Nothing to scan !?");
1208 while (optind < argc) { 2126 while (optind < argc) {
1209 search_path = argv[optind++]; 2127 search_path = argv[optind++];
1210 scanelf_dir(search_path); 2128 ret = scanelf_dir(search_path);
1211 } 2129 }
1212 2130
1213 /* clean up */ 2131 /* clean up */
1214 if (find_sym) { 2132 xarrayfree(ldpaths);
2133 xarrayfree(find_lib_arr);
2134 xarrayfree(find_section_arr);
1215 free(find_sym); 2135 free(find_lib);
1216 free(versioned_symname); 2136 free(find_section);
1217 }
1218 if (find_lib) free(find_lib);
1219 if (out_format) free(out_format);
1220 for (i = 0; ldpaths[i]; ++i)
1221 free(ldpaths[i]);
1222}
1223 2137
1224 2138 if (ldcache != 0)
1225 2139 munmap(ldcache, ldcache_size);
1226/* utility funcs */
1227static char *xstrdup(const char *s)
1228{
1229 char *ret = strdup(s);
1230 if (!ret) err("Could not strdup(): %s", strerror(errno));
1231 return ret; 2140 return ret;
1232} 2141}
1233 2142
1234static void *xmalloc(size_t size) 2143static char **get_split_env(const char *envvar)
1235{ 2144{
1236 void *ret = malloc(size); 2145 const char *delims = " \t\n";
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 2146 char **envvals = NULL;
1238 return ret; 2147 char *env, *s;
1239} 2148 int nentry;
1240 2149
1241static void xstrcat(char **dst, const char *src, size_t *curr_len) 2150 if ((env = getenv(envvar)) == NULL)
1242{ 2151 return NULL;
1243 size_t new_len;
1244 2152
1245 new_len = strlen(*dst) + strlen(src); 2153 env = xstrdup(env);
1246 if (*curr_len <= new_len) { 2154 if (env == NULL)
1247 *curr_len = new_len + (*curr_len / 2); 2155 return NULL;
1248 *dst = realloc(*dst, *curr_len);
1249 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len);
1251 }
1252 2156
1253 strcat(*dst, src); 2157 s = strtok(env, delims);
1254} 2158 if (s == NULL) {
2159 free(env);
2160 return NULL;
2161 }
1255 2162
1256static inline void xchrcat(char **dst, const char append, size_t *curr_len) 2163 nentry = 0;
1257{ 2164 while (s != NULL) {
1258 static char my_app[2]; 2165 ++nentry;
1259 my_app[0] = append; 2166 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1260 my_app[1] = '\0'; 2167 envvals[nentry-1] = s;
1261 xstrcat(dst, my_app, curr_len); 2168 s = strtok(NULL, delims);
1262} 2169 }
2170 envvals[nentry] = NULL;
1263 2171
2172 /* don't want to free(env) as it contains the memory that backs
2173 * the envvals array of strings */
2174 return envvals;
2175}
1264 2176
2177static void parseenv(void)
2178{
2179 color_init(false);
2180 qa_textrels = get_split_env("QA_TEXTRELS");
2181 qa_execstack = get_split_env("QA_EXECSTACK");
2182 qa_wx_load = get_split_env("QA_WX_LOAD");
2183}
2184
2185#ifdef __PAX_UTILS_CLEANUP
2186static void cleanup(void)
2187{
2188 free(out_format);
2189 free(qa_textrels);
2190 free(qa_execstack);
2191 free(qa_wx_load);
2192}
2193#endif
1265 2194
1266int main(int argc, char *argv[]) 2195int main(int argc, char *argv[])
1267{ 2196{
2197 int ret;
1268 if (argc < 2) 2198 if (argc < 2)
1269 usage(EXIT_FAILURE); 2199 usage(EXIT_FAILURE);
2200 parseenv();
1270 parseargs(argc, argv); 2201 ret = parseargs(argc, argv);
1271 fclose(stdout); 2202 fclose(stdout);
1272#ifdef __BOUNDS_CHECKING_ON 2203#ifdef __PAX_UTILS_CLEANUP
1273 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2204 cleanup();
2205 warn("The calls to add/delete heap should be off:\n"
2206 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2207 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1274#endif 2208#endif
1275 return EXIT_SUCCESS; 2209 return ret;
1276} 2210}
2211
2212/* Match filename against entries in matchlist, return TRUE
2213 * if the file is listed */
2214static int file_matches_list(const char *filename, char **matchlist)
2215{
2216 char **file;
2217 char *match;
2218 char buf[__PAX_UTILS_PATH_MAX];
2219
2220 if (matchlist == NULL)
2221 return 0;
2222
2223 for (file = matchlist; *file != NULL; file++) {
2224 if (search_path) {
2225 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2226 match = buf;
2227 } else {
2228 match = *file;
2229 }
2230 if (fnmatch(match, filename, 0) == 0)
2231 return 1;
2232 }
2233 return 0;
2234}

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