/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 Revision 1.223
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 1.223 2011/07/30 17:08:30 solar 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> 10static const char *rcsid = "$Id: scanelf.c,v 1.223 2011/07/30 17:08:30 solar Exp $";
11#include <stdlib.h> 11const char argv0[] = "scanelf";
12#include <sys/types.h> 12
13#include <libgen.h>
14#include <limits.h>
15#define __USE_GNU
16#include <string.h>
17#include <errno.h>
18#include <unistd.h>
19#include <sys/stat.h>
20#include <dirent.h>
21#include <getopt.h>
22#include <assert.h>
23#include "paxelf.h" 13#include "paxinc.h"
24 14
25static const char *rcsid = "$Id: scanelf.c,v 1.88 2005/09/30 03:30:54 vapier Exp $";
26#define argv0 "scanelf"
27
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 */
32static char match_etypes[126] = "";
45static char *ldpaths[256]; 33static char *ldpaths[256];
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 char *find_section = NULL;
66static char *out_format = NULL; 62static char *out_format = NULL;
67static char *search_path = NULL; 63static char *search_path = NULL;
64static char fix_elf = 0;
68static char gmatch = 0; 65static char g_match = 0;
66static char use_ldcache = 0;
69 67
68static char **qa_textrels = NULL;
69static char **qa_execstack = NULL;
70static char **qa_wx_load = NULL;
71static char *root;
72
73static int match_bits = 0;
74static unsigned int match_perms = 0;
75static void *ldcache = NULL;
76static size_t ldcache_size = 0;
77static unsigned long setpax = 0UL;
78
79static int has_objdump = 0;
80
81/* find the path to a file by name */
82static char *which(const char *fname)
83{
84 static char fullpath[__PAX_UTILS_PATH_MAX];
85 char *path, *p;
86
87 path = getenv("PATH");
88 if (!path)
89 return NULL;
90
91 path = xstrdup(path);
92 while ((p = strrchr(path, ':')) != NULL) {
93 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
94 *p = 0;
95 if (access(fullpath, R_OK) != -1) {
96 free(path);
97 return fullpath;
98 }
99 }
100 free(path);
101 return NULL;
102}
103
104/* 1 on failure. 0 otherwise */
105static int rematch(const char *regex, const char *match, int cflags)
106{
107 regex_t preg;
108 int ret;
109
110 if ((match == NULL) || (regex == NULL))
111 return EXIT_FAILURE;
112
113 if ((ret = regcomp(&preg, regex, cflags))) {
114 char err[256];
115
116 if (regerror(ret, &preg, err, sizeof(err)))
117 fprintf(stderr, "regcomp failed: %s", err);
118 else
119 fprintf(stderr, "regcomp failed");
120
121 return EXIT_FAILURE;
122 }
123 ret = regexec(&preg, match, 0, NULL, 0);
124 regfree(&preg);
125
126 return ret;
127}
70 128
71/* sub-funcs for scanelf_file() */ 129/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 130static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 131{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 132 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
133
134 /* debug sections */
135 void *symtab = elf_findsecbyname(elf, ".symtab");
136 void *strtab = elf_findsecbyname(elf, ".strtab");
137 /* runtime sections */
138 void *dynsym = elf_findsecbyname(elf, ".dynsym");
139 void *dynstr = elf_findsecbyname(elf, ".dynstr");
140
75#define GET_SYMTABS(B) \ 141#define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \ 142 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
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) { \ 143 if (symtab && dynsym) { \
144 Elf ## B ## _Shdr *esymtab = symtab; \
145 Elf ## B ## _Shdr *edynsym = dynsym; \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 146 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
86 } else { \ 147 } else \
87 *sym = (void*)(symtab ? symtab : dynsym); \ 148 *sym = symtab ? symtab : dynsym; \
88 } \
89 if (strtab && dynstr) { \ 149 if (strtab && dynstr) { \
150 Elf ## B ## _Shdr *estrtab = strtab; \
151 Elf ## B ## _Shdr *edynstr = dynstr; \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 152 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
91 } else { \ 153 } else \
92 *tab = (void*)(strtab ? strtab : dynstr); \ 154 *tab = strtab ? strtab : dynstr; \
93 } \
94 } 155 }
95 GET_SYMTABS(32) 156 GET_SYMTABS(32)
96 GET_SYMTABS(64) 157 GET_SYMTABS(64)
97} 158}
159
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 160static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 161{
100 static char *paxflags;
101 static char ret[7]; 162 static char ret[7];
102 unsigned long i, shown; 163 unsigned long i, shown;
103 164
104 if (!show_pax) return NULL; 165 if (!show_pax) return NULL;
105 166
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 173 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 174 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 175 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 176 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \ 177 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 178 if (fix_elf && setpax) { \
179 /* set the paxctl flags */ \
180 ESET(phdr[i].p_flags, setpax); \
181 } \
182 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
118 continue; \ 183 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 184 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \ 185 *found_pax = 1; \
121 ++shown; \ 186 ++shown; \
122 break; \ 187 break; \
124 } 189 }
125 SHOW_PAX(32) 190 SHOW_PAX(32)
126 SHOW_PAX(64) 191 SHOW_PAX(64)
127 } 192 }
128 193
194 if (fix_elf && setpax) {
195 /* set the chpax settings */
196 if (elf->elf_class == ELFCLASS32) {
197 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
198 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
199 } else {
200 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
201 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
202 }
203 }
204
129 /* fall back to EI_PAX if no PT_PAX was found */ 205 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 206 if (!*ret) {
207 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 208 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 209 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 210 *found_pax = 1;
134 return paxflags; 211 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 212 }
136 strncpy(ret, paxflags, sizeof(ret)); 213 strncpy(ret, paxflags, sizeof(ret));
137 } 214 }
138 215
139 if (be_quiet && !shown) 216 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 217 return NULL;
218 else
141 return ret; 219 return ret;
142
143} 220}
221
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 222static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 223{
146 static char ret[12]; 224 static char ret[12];
147 char *found; 225 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load; 226 unsigned long i, shown, multi_stack, multi_relro, multi_load;
227 int max_pt_load;
150 228
151 if (!show_phdr) return NULL; 229 if (!show_phdr) return NULL;
152 230
153 memcpy(ret, "--- --- ---\0", 12); 231 memcpy(ret, "--- --- ---\0", 12);
154 232
155 shown = 0; 233 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 234 multi_stack = multi_relro = multi_load = 0;
235 max_pt_load = elf_max_pt_load(elf);
157 236
158 if (elf->phdr) { 237#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 238#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 239 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 240 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
241 Elf ## B ## _Off offset; \
242 uint32_t flags, check_flags; \
243 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 244 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 245 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 246 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
247 if (multi_stack++) \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 248 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
249 if (file_matches_list(elf->filename, qa_execstack)) \
250 continue; \
167 found = found_phdr; \ 251 found = found_phdr; \
168 off = 0; \ 252 offset = 0; \
169 check_flags = PF_X; \ 253 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 254 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
255 if (multi_relro++) \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 256 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \ 257 found = found_relro; \
173 off = 4; \ 258 offset = 4; \
174 check_flags = PF_X; \ 259 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 260 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 261 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
262 if (multi_load++ > max_pt_load) \
263 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
264 if (file_matches_list(elf->filename, qa_wx_load)) \
265 continue; \
177 found = found_load; \ 266 found = found_load; \
178 off = 8; \ 267 offset = 8; \
179 check_flags = PF_W|PF_X; \ 268 check_flags = PF_W|PF_X; \
180 } else \ 269 } else \
181 continue; \ 270 continue; \
182 flags = EGET(phdr[i].p_flags); \ 271 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 272 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \ 273 continue; \
274 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
275 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
276 ret[3] = ret[7] = '!'; \
277 flags = EGET(phdr[i].p_flags); \
278 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 279 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 280 *found = 1; \
187 ++shown; \ 281 ++shown; \
282 } \
283 } else if (elf->shdr != NULL) { \
284 /* no program headers which means this is prob an object file */ \
285 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
286 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
287 char *str; \
288 if ((void*)strtbl > elf->data_end) \
289 goto skip_this_shdr##B; \
290 check_flags = SHF_WRITE|SHF_EXECINSTR; \
291 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
292 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
293 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
294 str = elf->data + offset; \
295 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
296 if (!strcmp(str, NOTE_GNU_STACK)) { \
297 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
298 flags = EGET(shdr[i].sh_flags); \
299 if (be_quiet && ((flags & check_flags) != check_flags)) \
300 continue; \
301 ++*found_phdr; \
302 shown = 1; \
303 if (flags & SHF_WRITE) ret[0] = 'W'; \
304 if (flags & SHF_ALLOC) ret[1] = 'A'; \
305 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
306 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
307 break; \
308 } \
309 } \
310 skip_this_shdr##B: \
311 if (!multi_stack) { \
312 if (file_matches_list(elf->filename, qa_execstack)) \
313 return NULL; \
314 *found_phdr = 1; \
315 shown = 1; \
316 memcpy(ret, "!WX", 3); \
317 } \
188 } \ 318 } \
189 } 319 }
190 SHOW_PHDR(32) 320 SHOW_PHDR(32)
191 SHOW_PHDR(64) 321 SHOW_PHDR(64)
192 }
193 322
194 if (be_quiet && !shown) 323 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 324 return NULL;
196 else 325 else
197 return ret; 326 return ret;
198} 327}
328
329/*
330 * See if this ELF contains a DT_TEXTREL tag in any of its
331 * PT_DYNAMIC sections.
332 */
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 333static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 334{
201 static char ret[] = "TEXTREL"; 335 static const char *ret = "TEXTREL";
202 unsigned long i; 336 unsigned long i;
203 337
204 if (!show_textrel && !show_textrels) return NULL; 338 if (!show_textrel && !show_textrels) return NULL;
339
340 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
205 341
206 if (elf->phdr) { 342 if (elf->phdr) {
207#define SHOW_TEXTREL(B) \ 343#define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \ 344 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \ 345 Elf ## B ## _Dyn *dyn; \
210 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 346 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
211 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 347 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
212 Elf ## B ## _Off offset; \ 348 Elf ## B ## _Off offset; \
213 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 349 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
214 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 350 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
215 offset = EGET(phdr[i].p_offset); \ 351 offset = EGET(phdr[i].p_offset); \
216 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 352 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
217 dyn = DYN ## B (elf->data + offset); \ 353 dyn = DYN ## B (elf->vdata + offset); \
218 while (EGET(dyn->d_tag) != DT_NULL) { \ 354 while (EGET(dyn->d_tag) != DT_NULL) { \
219 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 355 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
220 *found_textrel = 1; \ 356 *found_textrel = 1; \
221 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 357 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
222 return (be_wewy_wewy_quiet ? NULL : ret); \ 358 return (be_wewy_wewy_quiet ? NULL : ret); \
229 } 365 }
230 366
231 if (be_quiet || be_wewy_wewy_quiet) 367 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 368 return NULL;
233 else 369 else
234 return (char *)" - "; 370 return " - ";
235} 371}
372
373/*
374 * Scan the .text section to see if there are any relocations in it.
375 * Should rewrite this to check PT_LOAD sections that are marked
376 * Executable rather than the section named '.text'.
377 */
236static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 378static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237{ 379{
238 unsigned long s, r, rmax; 380 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 381 void *symtab_void, *strtab_void, *text_void;
240 382
261 Elf ## B ## _Rela *rela; \ 403 Elf ## B ## _Rela *rela; \
262 /* search the section headers for relocations */ \ 404 /* search the section headers for relocations */ \
263 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 405 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
264 uint32_t sh_type = EGET(shdr[s].sh_type); \ 406 uint32_t sh_type = EGET(shdr[s].sh_type); \
265 if (sh_type == SHT_REL) { \ 407 if (sh_type == SHT_REL) { \
266 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 408 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
267 rela = NULL; \ 409 rela = NULL; \
268 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 410 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
269 } else if (sh_type == SHT_RELA) { \ 411 } else if (sh_type == SHT_RELA) { \
270 rel = NULL; \ 412 rel = NULL; \
271 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 413 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
272 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 414 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
273 } else \ 415 } else \
274 continue; \ 416 continue; \
275 /* now see if any of the relocs are in the .text */ \ 417 /* now see if any of the relocs are in the .text */ \
276 for (r = 0; r < rmax; ++r) { \ 418 for (r = 0; r < rmax; ++r) { \
291 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 433 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
292 if (be_verbose <= 2) continue; \ 434 if (be_verbose <= 2) continue; \
293 } else \ 435 } else \
294 *found_textrels = 1; \ 436 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 437 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 438 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
439 if ((void*)sym > elf->data_end) { \
440 warn("%s: corrupt ELF symbol", elf->filename); \
441 continue; \
442 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 443 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 444 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 445 sym += sym_max; \
300 else \ 446 else \
301 sym = NULL; \ 447 sym = NULL; \
302 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 448 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
303 /* show the raw details about this reloc */ \ 449 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \ 450 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \ 451 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 452 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
307 else \ 453 else \
308 printf("(memory/fake?)"); \ 454 printf("(memory/data?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \ 455 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \ 456 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 457 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
312 func = NULL; \ 458 func = NULL; \
313 offset_tmp = 0; \ 459 offset_tmp = 0; \
314 while (sym_max--) { \ 460 while (sym_max--) { \
315 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 461 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
316 func = sym; \ 462 func = sym; \
317 offset_tmp = EGET(sym->st_value); \ 463 offset_tmp = EGET(sym->st_value); \
318 } \ 464 } \
319 ++sym; \ 465 ++sym; \
320 } \ 466 } \
321 printf(" in "); \ 467 printf(" in "); \
322 if (func && func->st_name) \ 468 if (func && func->st_name) { \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 469 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
470 if (r_offset > EGET(func->st_size)) \
471 printf("(optimized out: previous %s)", func_name); \
324 else \ 472 else \
325 printf("(NULL: fake?)"); \ 473 printf("%s", func_name); \
474 } else \
475 printf("(optimized out)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 476 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
477 if (be_verbose && has_objdump) { \
478 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
479 char *sysbuf; \
480 size_t syslen; \
481 int sysret; \
482 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"; \
483 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
484 sysbuf = xmalloc(syslen); \
485 if (end_addr < r_offset) \
486 /* not uncommon when things are optimized out */ \
487 end_addr = r_offset + 0x100; \
488 snprintf(sysbuf, syslen, sysfmt, \
489 (unsigned long)offset_tmp, \
490 (unsigned long)end_addr, \
491 elf->filename, \
492 (unsigned long)r_offset); \
493 fflush(stdout); \
494 sysret = system(sysbuf); \
495 fflush(stdout); \
496 free(sysbuf); \
497 } \
327 } \ 498 } \
328 } } 499 } }
329 SHOW_TEXTRELS(32) 500 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64) 501 SHOW_TEXTRELS(64)
331 } 502 }
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 504 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334 505
335 return NULL; 506 return NULL;
336} 507}
337 508
338static void rpath_security_checks(elfobj *, char *); 509static void rpath_security_checks(elfobj *, char *, const char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 510static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
511{
340 struct stat st; 512 struct stat st;
341 switch (*item) { 513 switch (*item) {
514 case '/': break;
342 case 0: 515 case '.':
343 warnf("Security problem NULL RPATH in %s", elf->filename); 516 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
344 break; 517 break;
345 case '/': break; 518 case ':':
519 case '\0':
520 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
521 break;
346 case '$': 522 case '$':
347 if (fstat(elf->fd, &st) != -1) 523 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 524 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", 525 warnf("Security problem with %s='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777); 526 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
351 break; 527 break;
352 default: 528 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 529 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
354 break; 530 break;
355 } 531 }
356} 532}
357static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 533static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358{ 534{
375 Elf ## B ## _Off offset; \ 551 Elf ## B ## _Off offset; \
376 Elf ## B ## _Xword word; \ 552 Elf ## B ## _Xword word; \
377 /* Scan all the program headers */ \ 553 /* Scan all the program headers */ \
378 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 554 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
379 /* Just scan dynamic headers */ \ 555 /* Just scan dynamic headers */ \
380 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 556 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
381 offset = EGET(phdr[i].p_offset); \ 557 offset = EGET(phdr[i].p_offset); \
382 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 558 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
383 /* Just scan dynamic RPATH/RUNPATH headers */ \ 559 /* Just scan dynamic RPATH/RUNPATH headers */ \
384 dyn = DYN ## B (elf->data + offset); \ 560 dyn = DYN ## B (elf->vdata + offset); \
385 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 561 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
386 if (word == DT_RPATH) { \ 562 if (word == DT_RPATH) { \
387 r = &rpath; \ 563 r = &rpath; \
388 } else if (word == DT_RUNPATH) { \ 564 } else if (word == DT_RUNPATH) { \
389 r = &runpath; \ 565 r = &runpath; \
393 } \ 569 } \
394 /* Verify the memory is somewhat sane */ \ 570 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 571 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \ 572 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 573 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \ 574 *r = elf->data + offset; \
575 /* cache the length in case we need to nuke this section later on */ \
576 if (fix_elf) \
577 offset = strlen(*r); \
399 /* If quiet, don't output paths in ld.so.conf */ \ 578 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \ 579 if (be_quiet) { \
401 size_t len; \ 580 size_t len; \
402 char *start, *end; \ 581 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \ 582 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \ 583 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \ 584 start = *r; \
406 /* scan each path in : delimited list */ \ 585 /* scan each path in : delimited list */ \
407 while (start) { \ 586 while (start) { \
408 rpath_security_checks(elf, start); \ 587 rpath_security_checks(elf, start, get_elfdtype(word)); \
409 end = strchr(start, ':'); \ 588 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \ 589 len = (end ? abs(end - start) : strlen(start)); \
590 if (use_ldcache) \
411 for (s = 0; ldpaths[s]; ++s) { \ 591 for (s = 0; ldpaths[s]; ++s) \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 592 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
413 *r = (end ? end + 1 : NULL); \ 593 *r = end; \
594 /* corner case ... if RPATH reads "/usr/lib:", we want \
595 * to show ':' rather than '' */ \
596 if (end && end[1] != '\0') \
597 (*r)++; \
414 break; \ 598 break; \
415 } \ 599 } \
416 } \
417 if (!*r || !ldpaths[s] || !end) \ 600 if (!*r || !end) \
418 start = NULL; \ 601 break; \
419 else \ 602 else \
420 start = start + len + 1; \ 603 start = start + len + 1; \
421 } \ 604 } \
422 } \ 605 } \
606 if (*r) { \
607 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
608 /* just nuke it */ \
609 nuke_it##B: \
610 memset(*r, 0x00, offset); \
611 *r = NULL; \
612 ESET(dyn->d_tag, DT_DEBUG); \
613 ESET(dyn->d_un.d_ptr, 0); \
614 } else if (fix_elf) { \
615 /* try to clean "bad" paths */ \
616 size_t len, tmpdir_len; \
617 char *start, *end; \
618 const char *tmpdir; \
619 start = *r; \
620 tmpdir = (getenv("TMPDIR") ? : "."); \
621 tmpdir_len = strlen(tmpdir); \
622 while (1) { \
623 end = strchr(start, ':'); \
624 if (start == end) { \
625 eat_this_path##B: \
626 len = strlen(end); \
627 memmove(start, end+1, len); \
628 start[len-1] = '\0'; \
629 end = start - 1; \
630 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
631 if (!end) { \
632 if (start == *r) \
633 goto nuke_it##B; \
634 *--start = '\0'; \
635 } else \
636 goto eat_this_path##B; \
637 } \
638 if (!end) \
639 break; \
640 start = end + 1; \
641 } \
642 if (**r == '\0') \
643 goto nuke_it##B; \
644 } \
645 if (*r) \
423 if (*r) *found_rpath = 1; \ 646 *found_rpath = 1; \
647 } \
424 } \ 648 } \
425 ++dyn; \ 649 ++dyn; \
426 } \ 650 } \
427 } } 651 } }
428 SHOW_RPATH(32) 652 SHOW_RPATH(32)
445 } else if (rpath || runpath) 669 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 670 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet) 671 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len); 672 xstrcat(ret, " - ", ret_len);
449} 673}
674
675#define LDSO_CACHE_MAGIC "ld.so-"
676#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
677#define LDSO_CACHE_VER "1.7.0"
678#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
679#define FLAG_ANY -1
680#define FLAG_TYPE_MASK 0x00ff
681#define FLAG_LIBC4 0x0000
682#define FLAG_ELF 0x0001
683#define FLAG_ELF_LIBC5 0x0002
684#define FLAG_ELF_LIBC6 0x0003
685#define FLAG_REQUIRED_MASK 0xff00
686#define FLAG_SPARC_LIB64 0x0100
687#define FLAG_IA64_LIB64 0x0200
688#define FLAG_X8664_LIB64 0x0300
689#define FLAG_S390_LIB64 0x0400
690#define FLAG_POWERPC_LIB64 0x0500
691#define FLAG_MIPS64_LIBN32 0x0600
692#define FLAG_MIPS64_LIBN64 0x0700
693
694static char *lookup_cache_lib(elfobj *, char *);
695
696#if defined(__GLIBC__) || defined(__UCLIBC__)
697
698static char *lookup_cache_lib(elfobj *elf, char *fname)
699{
700 int fd;
701 char *strs;
702 static char buf[__PAX_UTILS_PATH_MAX] = "";
703 const char cachefile[] = "/etc/ld.so.cache";
704 struct stat st;
705
706 typedef struct {
707 char magic[LDSO_CACHE_MAGIC_LEN];
708 char version[LDSO_CACHE_VER_LEN];
709 int nlibs;
710 } header_t;
711 header_t *header;
712
713 typedef struct {
714 int flags;
715 int sooffset;
716 int liboffset;
717 } libentry_t;
718 libentry_t *libent;
719
720 if (fname == NULL)
721 return NULL;
722
723 if (ldcache == NULL) {
724 if (stat(cachefile, &st))
725 return NULL;
726
727 fd = open(cachefile, O_RDONLY);
728 if (fd == -1)
729 return NULL;
730
731 /* cache these values so we only map/unmap the cache file once */
732 ldcache_size = st.st_size;
733 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
734 close(fd);
735
736 if (ldcache == MAP_FAILED) {
737 ldcache = NULL;
738 return NULL;
739 }
740
741 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
742 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
743 {
744 munmap(ldcache, ldcache_size);
745 ldcache = NULL;
746 return NULL;
747 }
748 } else
749 header = ldcache;
750
751 libent = ldcache + sizeof(header_t);
752 strs = (char *) &libent[header->nlibs];
753
754 for (fd = 0; fd < header->nlibs; ++fd) {
755 /* This should be more fine grained, but for now we assume that
756 * diff arches will not be cached together, and we ignore the
757 * the different multilib mips cases.
758 */
759 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
760 continue;
761 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
762 continue;
763
764 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
765 continue;
766
767 /* Return first hit because that is how the ldso rolls */
768 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
769 break;
770 }
771
772 return buf;
773}
774
775#elif defined(__NetBSD__)
776static char *lookup_cache_lib(elfobj *elf, char *fname)
777{
778 static char buf[__PAX_UTILS_PATH_MAX] = "";
779 static struct stat st;
780
781 char **ldpath;
782 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
783 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
784 continue; /* if the pathname is too long, or something went wrong, ignore */
785
786 if (stat(buf, &st) != 0)
787 continue; /* if the lib doesn't exist in *ldpath, look further */
788
789 /* NetBSD doesn't actually do sanity checks, it just loads the file
790 * and if that doesn't work, continues looking in other directories.
791 * This cannot easily be safely emulated, unfortunately. For now,
792 * just assume that if it exists, it's a valid library. */
793
794 return buf;
795 }
796
797 /* not found in any path */
798 return NULL;
799}
800#else
801#ifdef __ELF__
802#warning Cache support not implemented for your target
803#endif
804static char *lookup_cache_lib(elfobj *elf, char *fname)
805{
806 return NULL;
807}
808#endif
809
450static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 810static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451{ 811{
452 unsigned long i; 812 unsigned long i;
453 char *needed; 813 char *needed;
454 void *strtbl_void; 814 void *strtbl_void;
815 char *p;
455 816
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 817 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
457 818
458 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 819 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459 820
464 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 825 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
465 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 826 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
466 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 827 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
467 Elf ## B ## _Off offset; \ 828 Elf ## B ## _Off offset; \
468 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 829 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
469 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 830 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
470 offset = EGET(phdr[i].p_offset); \ 831 offset = EGET(phdr[i].p_offset); \
471 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 832 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
472 dyn = DYN ## B (elf->data + offset); \ 833 dyn = DYN ## B (elf->vdata + offset); \
473 while (EGET(dyn->d_tag) != DT_NULL) { \ 834 while (EGET(dyn->d_tag) != DT_NULL) { \
474 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 835 if (EGET(dyn->d_tag) == DT_NEEDED) { \
475 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 836 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
476 if (offset >= (Elf ## B ## _Off)elf->len) { \ 837 if (offset >= (Elf ## B ## _Off)elf->len) { \
477 ++dyn; \ 838 ++dyn; \
478 continue; \ 839 continue; \
479 } \ 840 } \
480 needed = (char*)(elf->data + offset); \ 841 needed = elf->data + offset; \
481 if (op == 0) { \ 842 if (op == 0) { \
482 if (!be_wewy_wewy_quiet) { \ 843 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \ 844 if (*found_needed) xchrcat(ret, ',', ret_len); \
845 if (use_ldcache) \
846 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
847 needed = p; \
484 xstrcat(ret, needed, ret_len); \ 848 xstrcat(ret, needed, ret_len); \
485 } \ 849 } \
486 *found_needed = 1; \ 850 *found_needed = 1; \
487 } else { \ 851 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 852 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
489 *found_lib = 1; \ 853 *found_lib = 1; \
490 return (be_wewy_wewy_quiet ? NULL : needed); \ 854 return (be_wewy_wewy_quiet ? NULL : needed); \
491 } \ 855 } \
492 } \ 856 } \
493 } \ 857 } \
524} 888}
525static char *scanelf_file_bind(elfobj *elf, char *found_bind) 889static char *scanelf_file_bind(elfobj *elf, char *found_bind)
526{ 890{
527 unsigned long i; 891 unsigned long i;
528 struct stat s; 892 struct stat s;
893 char dynamic = 0;
529 894
530 if (!show_bind) return NULL; 895 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL; 896 if (!elf->phdr) return NULL;
532 897
533#define SHOW_BIND(B) \ 898#define SHOW_BIND(B) \
535 Elf ## B ## _Dyn *dyn; \ 900 Elf ## B ## _Dyn *dyn; \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 901 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 902 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \ 903 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 904 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 905 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
906 dynamic = 1; \
541 offset = EGET(phdr[i].p_offset); \ 907 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 908 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \ 909 dyn = DYN ## B (elf->vdata + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \ 910 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 911 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
546 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 912 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
547 { \ 913 { \
548 if (be_quiet) return NULL; \ 914 if (be_quiet) return NULL; \
556 SHOW_BIND(32) 922 SHOW_BIND(32)
557 SHOW_BIND(64) 923 SHOW_BIND(64)
558 924
559 if (be_wewy_wewy_quiet) return NULL; 925 if (be_wewy_wewy_quiet) return NULL;
560 926
927 /* 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)) { 928 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
562 return NULL; 929 return NULL;
563 } else { 930 } else {
564 *found_bind = 1; 931 *found_bind = 1;
565 return (char *) "LAZY"; 932 return (char *)(dynamic ? "LAZY" : "STATIC");
566 } 933 }
567} 934}
568static char *scanelf_file_soname(elfobj *elf, char *found_soname) 935static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569{ 936{
570 unsigned long i; 937 unsigned long i;
582 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 949 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
583 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 950 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
584 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 951 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
585 Elf ## B ## _Off offset; \ 952 Elf ## B ## _Off offset; \
586 /* only look for soname in shared objects */ \ 953 /* only look for soname in shared objects */ \
587 if (ehdr->e_type != ET_DYN) \ 954 if (EGET(ehdr->e_type) != ET_DYN) \
588 return NULL; \ 955 return NULL; \
589 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 956 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
590 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 957 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
591 offset = EGET(phdr[i].p_offset); \ 958 offset = EGET(phdr[i].p_offset); \
592 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 959 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
593 dyn = DYN ## B (elf->data + offset); \ 960 dyn = DYN ## B (elf->vdata + offset); \
594 while (EGET(dyn->d_tag) != DT_NULL) { \ 961 while (EGET(dyn->d_tag) != DT_NULL) { \
595 if (EGET(dyn->d_tag) == DT_SONAME) { \ 962 if (EGET(dyn->d_tag) == DT_SONAME) { \
596 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 963 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
597 if (offset >= (Elf ## B ## _Off)elf->len) { \ 964 if (offset >= (Elf ## B ## _Off)elf->len) { \
598 ++dyn; \ 965 ++dyn; \
599 continue; \ 966 continue; \
600 } \ 967 } \
601 soname = (char*)(elf->data + offset); \ 968 soname = elf->data + offset; \
602 *found_soname = 1; \ 969 *found_soname = 1; \
603 return (be_wewy_wewy_quiet ? NULL : soname); \ 970 return (be_wewy_wewy_quiet ? NULL : soname); \
604 } \ 971 } \
605 ++dyn; \ 972 ++dyn; \
606 } \ 973 } \
609 SHOW_SONAME(64) 976 SHOW_SONAME(64)
610 } 977 }
611 978
612 return NULL; 979 return NULL;
613} 980}
981
982/*
983 * We support the symbol form:
984 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
985 * If the symbol name is empty, then all symbols are matched.
986 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
987 * Do not rely on this output format at all.
988 * Otherwise the symbol name is used to search (either regex or string compare).
989 * If the first char of the symbol name is a plus ("+"), then only match
990 * defined symbols. If it's a minus ("-"), only match undefined symbols.
991 * Putting modifiers in between the percent signs allows for more in depth
992 * filters. There are groups of modifiers. If you don't specify a member
993 * of a group, then all types in that group are matched. The current
994 * groups and their types are:
995 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
996 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
997 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
998 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
999 * You can search for multiple symbols at once by seperating with a comma (",").
1000 *
1001 * Some examples:
1002 * ELFs with a weak function "foo":
1003 * scanelf -s %wf%foo <ELFs>
1004 * ELFs that define the symbol "main":
1005 * scanelf -s +main <ELFs>
1006 * scanelf -s %d%main <ELFs>
1007 * ELFs that refer to the undefined symbol "brk":
1008 * scanelf -s -brk <ELFs>
1009 * scanelf -s %u%brk <ELFs>
1010 * All global defined objects in an ELF:
1011 * scanelf -s %ogd% <ELF>
1012 */
1013static void
1014scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1015 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1016{
1017 char *this_sym, *next_sym, saved = saved;
1018
1019 /* allow the user to specify a comma delimited list of symbols to search for */
1020 next_sym = NULL;
1021 do {
1022 bool inc_notype, inc_object, inc_func, inc_file,
1023 inc_local, inc_global, inc_weak,
1024 inc_def, inc_undef, inc_abs, inc_common;
1025
1026 if (next_sym) {
1027 next_sym[-1] = saved;
1028 this_sym = next_sym;
1029 } else
1030 this_sym = find_sym;
1031 if ((next_sym = strchr(this_sym, ','))) {
1032 /* make parsing easier by killing the comma temporarily */
1033 saved = *next_sym;
1034 *next_sym = '\0';
1035 next_sym += 1;
1036 }
1037
1038 /* symbol selection! */
1039 inc_notype = inc_object = inc_func = inc_file = \
1040 inc_local = inc_global = inc_weak = \
1041 inc_def = inc_undef = inc_abs = inc_common = \
1042 (*this_sym != '%');
1043
1044 /* parse the contents of %...% */
1045 if (!inc_notype) {
1046 while (*(this_sym++)) {
1047 if (*this_sym == '%') {
1048 ++this_sym;
1049 break;
1050 }
1051 switch (*this_sym) {
1052 case 'n': inc_notype = true; break;
1053 case 'o': inc_object = true; break;
1054 case 'f': inc_func = true; break;
1055 case 'F': inc_file = true; break;
1056 case 'l': inc_local = true; break;
1057 case 'g': inc_global = true; break;
1058 case 'w': inc_weak = true; break;
1059 case 'd': inc_def = true; break;
1060 case 'u': inc_undef = true; break;
1061 case 'a': inc_abs = true; break;
1062 case 'c': inc_common = true; break;
1063 default: err("invalid symbol selector '%c'", *this_sym);
1064 }
1065 }
1066
1067 /* If no types are matched, not match all */
1068 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1069 inc_notype = inc_object = inc_func = inc_file = true;
1070 if (!inc_local && !inc_global && !inc_weak)
1071 inc_local = inc_global = inc_weak = true;
1072 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1073 inc_def = inc_undef = inc_abs = inc_common = true;
1074
1075 /* backwards compat for defined/undefined short hand */
1076 } else if (*this_sym == '+') {
1077 inc_undef = false;
1078 ++this_sym;
1079 } else if (*this_sym == '-') {
1080 inc_def = inc_abs = inc_common = false;
1081 ++this_sym;
1082 }
1083
1084 /* filter symbols */
1085 if ((!inc_notype && stt == STT_NOTYPE) || \
1086 (!inc_object && stt == STT_OBJECT) || \
1087 (!inc_func && stt == STT_FUNC ) || \
1088 (!inc_file && stt == STT_FILE ) || \
1089 (!inc_local && stb == STB_LOCAL ) || \
1090 (!inc_global && stb == STB_GLOBAL) || \
1091 (!inc_weak && stb == STB_WEAK ) || \
1092 (!inc_def && shn && shn < SHN_LORESERVE) || \
1093 (!inc_undef && shn == SHN_UNDEF ) || \
1094 (!inc_abs && shn == SHN_ABS ) || \
1095 (!inc_common && shn == SHN_COMMON))
1096 continue;
1097
1098 if (*this_sym == '*') {
1099 /* a "*" symbol gets you debug output */
1100 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1101 ((*found_sym == 0) ? "\n\t" : "\t"),
1102 elf->base_filename,
1103 size,
1104 get_elfstttype(stt),
1105 get_elfstbtype(stb),
1106 get_elfshntype(shn),
1107 symname);
1108 goto matched;
1109
1110 } else {
1111 if (g_match) {
1112 /* regex match the symbol */
1113 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1114 continue;
1115
1116 } else if (*this_sym) {
1117 /* give empty symbols a "pass", else do a normal compare */
1118 const size_t len = strlen(this_sym);
1119 if (!(strncmp(this_sym, symname, len) == 0 &&
1120 /* Accept unversioned symbol names */
1121 (symname[len] == '\0' || symname[len] == '@')))
1122 continue;
1123 }
1124
1125 if (be_semi_verbose) {
1126 char buf[1024];
1127 snprintf(buf, sizeof(buf), "%lX %s %s",
1128 size,
1129 get_elfstttype(stt),
1130 this_sym);
1131 *ret = xstrdup(buf);
1132 } else {
1133 if (*ret) xchrcat(ret, ',', ret_len);
1134 xstrcat(ret, symname, ret_len);
1135 }
1136
1137 goto matched;
1138 }
1139 } while (next_sym);
1140
1141 return;
1142
1143 matched:
1144 *found_sym = 1;
1145 if (next_sym)
1146 next_sym[-1] = saved;
1147}
1148
614static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1149static char *scanelf_file_sym(elfobj *elf, char *found_sym)
615{ 1150{
616 unsigned long i; 1151 unsigned long i;
1152 char *ret;
617 void *symtab_void, *strtab_void; 1153 void *symtab_void, *strtab_void;
618 1154
619 if (!find_sym) return NULL; 1155 if (!find_sym) return NULL;
1156 ret = NULL;
620 1157
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1158 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622 1159
623 if (symtab_void && strtab_void) { 1160 if (symtab_void && strtab_void) {
624#define FIND_SYM(B) \ 1161#define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \ 1162 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1163 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1164 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1165 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1166 unsigned long cnt = EGET(symtab->sh_entsize); \
630 char *symname; \ 1167 char *symname; \
1168 size_t ret_len = 0; \
1169 if (cnt) \
1170 cnt = EGET(symtab->sh_size) / cnt; \
631 for (i = 0; i < cnt; ++i) { \ 1171 for (i = 0; i < cnt; ++i) { \
1172 if ((void*)sym > elf->data_end) { \
1173 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1174 goto break_out; \
1175 } \
632 if (sym->st_name) { \ 1176 if (sym->st_name) { \
1177 /* make sure the symbol name is in acceptable memory range */ \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1178 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
634 if (*find_sym == '*') { \ 1179 if ((void*)symname > elf->data_end) { \
635 printf("%s(%s) %5lX %15s %s\n", \ 1180 warnf("%s: corrupt ELF symbols", elf->filename); \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1181 ++sym; \
637 elf->base_filename, \ 1182 continue; \
638 (long)sym->st_size, \ 1183 } \
639 (char *)get_elfstttype(sym->st_info), \ 1184 scanelf_match_symname(elf, found_sym, \
640 symname); \ 1185 &ret, &ret_len, symname, \
641 *found_sym = 1; \ 1186 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
642 } else if ((strcmp(find_sym, symname) == 0) || \ 1187 ELF##B##_ST_BIND(EGET(sym->st_info)), \
643 (strcmp(symname, versioned_symname) == 0)) \ 1188 EGET(sym->st_shndx), \
644 (*found_sym)++; \ 1189 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1190 EGET(sym->st_size)); \
645 } \ 1191 } \
646 ++sym; \ 1192 ++sym; \
647 } } 1193 } }
648 FIND_SYM(32) 1194 FIND_SYM(32)
649 FIND_SYM(64) 1195 FIND_SYM(64)
650 } 1196 }
651 1197
1198break_out:
652 if (be_wewy_wewy_quiet) return NULL; 1199 if (be_wewy_wewy_quiet) return NULL;
653 1200
654 if (*find_sym != '*' && *found_sym) 1201 if (*find_sym != '*' && *found_sym)
655 return find_sym; 1202 return ret;
656 if (be_quiet) 1203 if (be_quiet)
657 return NULL; 1204 return NULL;
658 else 1205 else
659 return (char *)" - "; 1206 return (char *)" - ";
660} 1207}
1208
1209static char *scanelf_file_sections(elfobj *elf, char *found_section)
1210{
1211 if (!find_section)
1212 return NULL;
1213
1214#define FIND_SECTION(B) \
1215 if (elf->elf_class == ELFCLASS ## B) { \
1216 int invert; \
1217 Elf ## B ## _Shdr *section; \
1218 invert = (*find_section == '!' ? 1 : 0); \
1219 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1220 if ((section == NULL && invert) || (section != NULL && !invert)) \
1221 *found_section = 1; \
1222 }
1223 FIND_SECTION(32)
1224 FIND_SECTION(64)
1225
1226 if (be_wewy_wewy_quiet)
1227 return NULL;
1228
1229 if (*found_section)
1230 return find_section;
1231
1232 if (be_quiet)
1233 return NULL;
1234 else
1235 return (char *)" - ";
1236}
1237
661/* scan an elf file and show all the fun stuff */ 1238/* scan an elf file and show all the fun stuff */
662#define prints(str) write(fileno(stdout), str, strlen(str)) 1239#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
663static void scanelf_file(const char *filename) 1240static int scanelf_elfobj(elfobj *elf)
664{ 1241{
665 unsigned long i; 1242 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1243 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname, 1244 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels; 1245 found_sym, found_lib, found_file, found_textrels, found_section;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL; 1246 static char *out_buffer = NULL;
672 static size_t out_len; 1247 static size_t out_len;
673 1248
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 = \ 1249 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1250 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0; 1251 found_sym = found_lib = found_file = found_textrels = found_section = 0;
692 1252
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) 1253 if (be_verbose > 2)
700 printf("%s: scanning file {%s,%s}\n", filename, 1254 printf("%s: scanning file {%s,%s}\n", elf->filename,
701 get_elfeitype(EI_CLASS, elf->elf_class), 1255 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1256 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose) 1257 else if (be_verbose > 1)
704 printf("%s: scanning file\n", filename); 1258 printf("%s: scanning file\n", elf->filename);
705 1259
706 /* init output buffer */ 1260 /* init output buffer */
707 if (!out_buffer) { 1261 if (!out_buffer) {
708 out_len = sizeof(char) * 80; 1262 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len); 1263 out_buffer = xmalloc(out_len);
710 } 1264 }
711 *out_buffer = '\0'; 1265 *out_buffer = '\0';
712 1266
713 /* show the header */ 1267 /* show the header */
714 if (!be_quiet && show_banner) { 1268 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) { 1269 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue; 1270 if (!IS_MODIFIER(out_format[i])) continue;
717 1271
718 switch (out_format[++i]) { 1272 switch (out_format[++i]) {
1273 case '+': break;
719 case '%': break; 1274 case '%': break;
720 case '#': break; 1275 case '#': break;
721 case 'F': 1276 case 'F':
722 case 'p': 1277 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break; 1278 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break; 1279 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break; 1280 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break; 1281 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break; 1282 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break; 1283 case 'r': prints("RPATH "); break;
1284 case 'M': prints("CLASS "); break;
729 case 'n': prints("NEEDED "); break; 1285 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break; 1286 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break; 1287 case 'b': prints("BIND "); break;
1288 case 'Z': prints("SIZE "); break;
732 case 'S': prints("SONAME "); break; 1289 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break; 1290 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break; 1291 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break; 1292 case 'T': prints("TEXTRELS "); break;
1293 case 'k': prints("SECTION "); break;
1294 case 'a': prints("ARCH "); break;
1295 case 'I': prints("OSABI "); break;
1296 case 'Y': prints("EABI "); break;
1297 case 'O': prints("PERM "); break;
1298 case 'D': prints("ENDIAN "); break;
736 default: warnf("'%c' has no title ?", out_format[i]); 1299 default: warnf("'%c' has no title ?", out_format[i]);
737 } 1300 }
738 } 1301 }
739 if (!found_file) prints("FILE "); 1302 if (!found_file) prints("FILE ");
740 prints("\n"); 1303 prints("\n");
744 1307
745 /* dump all the good stuff */ 1308 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) { 1309 for (i = 0; out_format[i]; ++i) {
747 const char *out; 1310 const char *out;
748 const char *tmp; 1311 const char *tmp;
749 1312 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])) { 1313 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len); 1314 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue; 1315 continue;
757 } 1316 }
758 1317
759 out = NULL; 1318 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#'); 1319 be_wewy_wewy_quiet = (out_format[i] == '#');
1320 be_semi_verbose = (out_format[i] == '+');
761 switch (out_format[++i]) { 1321 switch (out_format[++i]) {
1322 case '+':
762 case '%': 1323 case '%':
763 case '#': 1324 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break; 1325 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F': 1326 case 'F':
766 found_file = 1; 1327 found_file = 1;
767 if (be_wewy_wewy_quiet) break; 1328 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len); 1329 xstrcat(&out_buffer, elf->filename, &out_len);
769 break; 1330 break;
770 case 'p': 1331 case 'p':
771 found_file = 1; 1332 found_file = 1;
772 if (be_wewy_wewy_quiet) break; 1333 if (be_wewy_wewy_quiet) break;
773 tmp = filename; 1334 tmp = elf->filename;
774 if (search_path) { 1335 if (search_path) {
775 ssize_t len_search = strlen(search_path); 1336 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename); 1337 ssize_t len_file = strlen(elf->filename);
777 if (!strncmp(filename, search_path, len_search) && \ 1338 if (!strncmp(elf->filename, search_path, len_search) && \
778 len_file > len_search) 1339 len_file > len_search)
779 tmp += len_search; 1340 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1341 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 } 1342 }
782 xstrcat(&out_buffer, tmp, &out_len); 1343 xstrcat(&out_buffer, tmp, &out_len);
783 break; 1344 break;
784 case 'f': 1345 case 'f':
785 found_file = 1; 1346 found_file = 1;
786 if (be_wewy_wewy_quiet) break; 1347 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/'); 1348 tmp = strrchr(elf->filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1); 1349 tmp = (tmp == NULL ? elf->filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len); 1350 xstrcat(&out_buffer, tmp, &out_len);
790 break; 1351 break;
791 case 'o': out = get_elfetype(elf); break; 1352 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1353 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; 1354 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; 1355 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1356 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; 1357 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1358 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1359 case 'D': out = get_endian(elf); break;
1360 case 'O': out = strfileperms(elf->filename); break;
797 case 'n': 1361 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1362 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; 1363 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1364 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1365 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1366 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1367 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1368 case 'a': out = get_elfemtype(elf); break;
1369 case 'I': out = get_elfosabi(elf); break;
1370 case 'Y': out = get_elf_eabi(elf); break;
1371 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]); 1372 default: warnf("'%c' has no scan code?", out_format[i]);
804 } 1373 }
1374 if (out)
805 if (out) xstrcat(&out_buffer, out, &out_len); 1375 xstrcat(&out_buffer, out, &out_len);
806 } 1376 }
807 1377
808#define FOUND_SOMETHING() \ 1378#define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1379 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \ 1380 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels) 1381 found_soname || found_sym || found_lib || found_textrels || found_section )
812 1382
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1383 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len); 1384 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len); 1385 xstrcat(&out_buffer, elf->filename, &out_len);
816 } 1386 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1387 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer); 1388 puts(out_buffer);
819 fflush(stdout); 1389 fflush(stdout);
820 } 1390 }
821 1391
1392 return 0;
1393}
1394
1395/* scan a single elf */
1396static int scanelf_elf(const char *filename, int fd, size_t len)
1397{
1398 int ret = 1;
1399 elfobj *elf;
1400
1401 /* verify this is real ELF */
1402 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1403 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1404 return ret;
1405 }
1406 switch (match_bits) {
1407 case 32:
1408 if (elf->elf_class != ELFCLASS32)
1409 goto label_done;
1410 break;
1411 case 64:
1412 if (elf->elf_class != ELFCLASS64)
1413 goto label_done;
1414 break;
1415 default: break;
1416 }
1417 if (strlen(match_etypes)) {
1418 char sbuf[126];
1419 strncpy(sbuf, match_etypes, sizeof(sbuf));
1420 if (strchr(match_etypes, ',') != NULL) {
1421 char *p;
1422 while ((p = strrchr(sbuf, ',')) != NULL) {
1423 *p = 0;
1424 if (etype_lookup(p+1) == get_etype(elf))
1425 goto label_ret;
1426 }
1427 }
1428 if (etype_lookup(sbuf) != get_etype(elf))
1429 goto label_done;
1430 }
1431
1432label_ret:
1433 ret = scanelf_elfobj(elf);
1434
1435label_done:
822 unreadelf(elf); 1436 unreadelf(elf);
1437 return ret;
1438}
1439
1440/* scan an archive of elfs */
1441static int scanelf_archive(const char *filename, int fd, size_t len)
1442{
1443 archive_handle *ar;
1444 archive_member *m;
1445 char *ar_buffer;
1446 elfobj *elf;
1447
1448 ar = ar_open_fd(filename, fd);
1449 if (ar == NULL)
1450 return 1;
1451
1452 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1453 while ((m = ar_next(ar)) != NULL) {
1454 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1455 if (cur_pos == -1)
1456 errp("lseek() failed");
1457 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1458 if (elf) {
1459 scanelf_elfobj(elf);
1460 unreadelf(elf);
1461 }
1462 }
1463 munmap(ar_buffer, len);
1464
1465 return 0;
1466}
1467/* scan a file which may be an elf or an archive or some other magical beast */
1468static int scanelf_file(const char *filename, const struct stat *st_cache)
1469{
1470 const struct stat *st = st_cache;
1471 struct stat symlink_st;
1472 int fd;
1473
1474 /* always handle regular files and handle symlinked files if no -y */
1475 if (S_ISLNK(st->st_mode)) {
1476 if (!scan_symlink) return 1;
1477 stat(filename, &symlink_st);
1478 st = &symlink_st;
1479 }
1480
1481 if (!S_ISREG(st->st_mode)) {
1482 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1483 return 1;
1484 }
1485
1486 if (match_perms) {
1487 if ((st->st_mode | match_perms) != st->st_mode)
1488 return 1;
1489 }
1490 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1491 return 1;
1492
1493 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1494 /* if it isn't an ELF, maybe it's an .a archive */
1495 scanelf_archive(filename, fd, st->st_size);
1496
1497 close(fd);
1498 return 0;
1499}
1500
1501static const char* maybe_add_root(const char* fname, char* buf)
1502{
1503 if (root && strncmp(fname, root, strlen(root))) {
1504 strcpy(buf, root);
1505 strncat(buf, fname, __PAX_UTILS_PATH_MAX-strlen(root)-1);
1506 fname = buf;
1507 }
1508 return fname;
823} 1509}
824 1510
825/* scan a directory for ET_EXEC files and print when we find one */ 1511/* scan a directory for ET_EXEC files and print when we find one */
826static void scanelf_dir(const char *path) 1512static int scanelf_dir(const char *path)
827{ 1513{
828 register DIR *dir; 1514 register DIR *dir;
829 register struct dirent *dentry; 1515 register struct dirent *dentry;
830 struct stat st_top, st; 1516 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX]; 1517 char buf[__PAX_UTILS_PATH_MAX];
1518 char _path[__PAX_UTILS_PATH_MAX];
832 size_t pathlen = 0, len = 0; 1519 size_t pathlen = 0, len = 0;
1520 int ret = 0;
1521
1522 path = maybe_add_root(path, _path);
833 1523
834 /* make sure path exists */ 1524 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) { 1525 if (lstat(path, &st_top) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path); 1526 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return; 1527 return 1;
838 } 1528 }
839 1529
840 /* ok, if it isn't a directory, assume we can open it */ 1530 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) { 1531 if (!S_ISDIR(st_top.st_mode)) {
842 scanelf_file(path); 1532 return scanelf_file(path, &st_top);
843 return;
844 } 1533 }
845 1534
846 /* now scan the dir looking for fun stuff */ 1535 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) { 1536 if ((dir = opendir(path)) == NULL) {
848 warnf("could not opendir %s: %s", path, strerror(errno)); 1537 warnf("could not opendir %s: %s", path, strerror(errno));
849 return; 1538 return 1;
850 } 1539 }
851 if (be_verbose) printf("%s: scanning dir\n", path); 1540 if (be_verbose > 1) printf("%s: scanning dir\n", path);
852 1541
853 pathlen = strlen(path); 1542 pathlen = strlen(path);
854 while ((dentry = readdir(dir))) { 1543 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1544 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue; 1545 continue;
858 if (len >= sizeof(buf)) { 1547 if (len >= sizeof(buf)) {
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1548 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
860 (unsigned long)len, (unsigned long)sizeof(buf)); 1549 (unsigned long)len, (unsigned long)sizeof(buf));
861 continue; 1550 continue;
862 } 1551 }
863 sprintf(buf, "%s/%s", path, dentry->d_name); 1552 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
864 if (lstat(buf, &st) != -1) { 1553 if (lstat(buf, &st) != -1) {
865 if (S_ISREG(st.st_mode)) 1554 if (S_ISREG(st.st_mode))
866 scanelf_file(buf); 1555 ret = scanelf_file(buf, &st);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1556 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1557 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf); 1558 ret = scanelf_dir(buf);
870 } 1559 }
871 } 1560 }
872 } 1561 }
873 closedir(dir); 1562 closedir(dir);
1563 return ret;
874} 1564}
875 1565
876static int scanelf_from_file(char *filename) 1566static int scanelf_from_file(const char *filename)
877{ 1567{
878 FILE *fp = NULL; 1568 FILE *fp = NULL;
879 char *p; 1569 char *p;
880 char path[_POSIX_PATH_MAX]; 1570 char path[__PAX_UTILS_PATH_MAX];
1571 int ret = 0;
881 1572
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1573 if (strcmp(filename, "-") == 0)
883 fp = stdin; 1574 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL) 1575 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1; 1576 return 1;
886 1577
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1578 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
888 if ((p = strchr(path, '\n')) != NULL) 1579 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0; 1580 *p = 0;
890 search_path = path; 1581 search_path = path;
891 scanelf_dir(path); 1582 ret = scanelf_dir(path);
892 } 1583 }
893 if (fp != stdin) 1584 if (fp != stdin)
894 fclose(fp); 1585 fclose(fp);
895 return 0; 1586 return ret;
896} 1587}
897 1588
898static void load_ld_so_conf() 1589#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1590
1591static int load_ld_cache_config(int i, const char *fname)
899{ 1592{
900 FILE *fp = NULL; 1593 FILE *fp = NULL;
901 char *p; 1594 char *p;
902 char path[_POSIX_PATH_MAX]; 1595 char path[__PAX_UTILS_PATH_MAX];
903 int i = 0; 1596 char _fname[__PAX_UTILS_PATH_MAX];
904 1597
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1598 fname = maybe_add_root(fname, _fname);
1599
1600 if (i + 1 == ARRAY_SIZE(ldpaths))
906 return; 1601 return i;
907 1602
1603 if ((fp = fopen(fname, "r")) == NULL)
1604 return i;
1605
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1606 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
909 if (*path != '/')
910 continue;
911
912 if ((p = strrchr(path, '\r')) != NULL) 1607 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0; 1608 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL) 1609 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0; 1610 *p = 0;
916 1611
1612 /* recursive includes of the same file will make this segfault. */
1613 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1614 glob_t gl;
1615 size_t x;
1616 char gpath[__PAX_UTILS_PATH_MAX];
1617
1618 memset(gpath, 0, sizeof(gpath));
1619 if (root)
1620 strcpy(gpath, root);
1621
1622 if (path[8] != '/')
1623 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1624 else
1625 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1626
1627 if (glob(gpath, 0, NULL, &gl) == 0) {
1628 for (x = 0; x < gl.gl_pathc; ++x) {
1629 /* try to avoid direct loops */
1630 if (strcmp(gl.gl_pathv[x], fname) == 0)
1631 continue;
1632 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1633 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1634 globfree(&gl);
1635 return i;
1636 }
1637 }
1638 globfree(&gl);
1639 continue;
1640 }
1641 }
1642
1643 if (*path != '/')
1644 continue;
1645
917 ldpaths[i++] = xstrdup(path); 1646 ldpaths[i++] = xstrdup(path);
918 1647
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1648 if (i + 1 == ARRAY_SIZE(ldpaths))
920 break; 1649 break;
921 } 1650 }
922 ldpaths[i] = NULL; 1651 ldpaths[i] = NULL;
923 1652
924 fclose(fp); 1653 fclose(fp);
1654 return i;
925} 1655}
1656
1657#elif defined(__FreeBSD__) || defined(__DragonFly__)
1658
1659static int load_ld_cache_config(int i, const char *fname)
1660{
1661 FILE *fp = NULL;
1662 char *b = NULL, *p;
1663 struct elfhints_hdr hdr;
1664 char _fname[__PAX_UTILS_PATH_MAX];
1665
1666 fname = maybe_add_root(fname, _fname);
1667
1668 if (i + 1 == ARRAY_SIZE(ldpaths))
1669 return i;
1670
1671 if ((fp = fopen(fname, "r")) == NULL)
1672 return i;
1673
1674 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1675 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1676 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1677 {
1678 fclose(fp);
1679 return i;
1680 }
1681
1682 b = xmalloc(hdr.dirlistlen + 1);
1683 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1684 fclose(fp);
1685 free(b);
1686 return i;
1687 }
1688
1689 while ((p = strsep(&b, ":"))) {
1690 if (*p == '\0') continue;
1691 ldpaths[i++] = xstrdup(p);
1692
1693 if (i + 1 == ARRAY_SIZE(ldpaths))
1694 break;
1695 }
1696 ldpaths[i] = NULL;
1697
1698 free(b);
1699 fclose(fp);
1700 return i;
1701}
1702
1703#else
1704#ifdef __ELF__
1705#warning Cache config support not implemented for your target
1706#endif
1707static int load_ld_cache_config(int i, const char *fname)
1708{
1709 memset(ldpaths, 0x00, sizeof(ldpaths));
1710 return 0;
1711}
1712#endif
926 1713
927/* scan /etc/ld.so.conf for paths */ 1714/* scan /etc/ld.so.conf for paths */
928static void scanelf_ldpath() 1715static void scanelf_ldpath(void)
929{ 1716{
930 char scan_l, scan_ul, scan_ull; 1717 char scan_l, scan_ul, scan_ull;
931 int i = 0; 1718 int i = 0;
932 1719
933 if (!ldpaths[0]) 1720 if (!ldpaths[0])
934 err("Unable to load any paths from ld.so.conf"); 1721 err("Unable to load any paths from ld.so.conf");
935 1722
936 scan_l = scan_ul = scan_ull = 0; 1723 scan_l = scan_ul = scan_ull = 0;
937 1724
938 while (ldpaths[i]) { 1725 while (ldpaths[i]) {
939 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1726 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
940 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1727 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
941 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1728 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
942 scanelf_dir(ldpaths[i]); 1729 scanelf_dir(ldpaths[i]);
943 ++i; 1730 ++i;
944 } 1731 }
945 1732
947 if (!scan_ul) scanelf_dir("/usr/lib"); 1734 if (!scan_ul) scanelf_dir("/usr/lib");
948 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1735 if (!scan_ull) scanelf_dir("/usr/local/lib");
949} 1736}
950 1737
951/* scan env PATH for paths */ 1738/* scan env PATH for paths */
952static void scanelf_envpath() 1739static void scanelf_envpath(void)
953{ 1740{
954 char *path, *p; 1741 char *path, *p;
955 1742
956 path = getenv("PATH"); 1743 path = getenv("PATH");
957 if (!path) 1744 if (!path)
964 } 1751 }
965 1752
966 free(path); 1753 free(path);
967} 1754}
968 1755
969 1756/* 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" 1757#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
973#define a_argument required_argument 1758#define a_argument required_argument
974static struct option const long_opts[] = { 1759static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'}, 1760 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'}, 1761 {"ldpath", no_argument, NULL, 'l'},
1762 {"root", a_argument, NULL, 128},
977 {"recursive", no_argument, NULL, 'R'}, 1763 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'}, 1764 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'}, 1765 {"symlink", no_argument, NULL, 'y'},
1766 {"archives", no_argument, NULL, 'A'},
1767 {"ldcache", no_argument, NULL, 'L'},
1768 {"fix", no_argument, NULL, 'X'},
1769 {"setpax", a_argument, NULL, 'z'},
980 {"pax", no_argument, NULL, 'x'}, 1770 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'}, 1771 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'}, 1772 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'}, 1773 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'}, 1774 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'}, 1775 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'}, 1776 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'}, 1777 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'}, 1778 {"symbol", a_argument, NULL, 's'},
1779 {"section", a_argument, NULL, 'k'},
989 {"lib", a_argument, NULL, 'N'}, 1780 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'}, 1781 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'}, 1782 {"textrels", no_argument, NULL, 'T'},
1783 {"etype", a_argument, NULL, 'E'},
1784 {"bits", a_argument, NULL, 'M'},
1785 {"endian", no_argument, NULL, 'D'},
1786 {"osabi", no_argument, NULL, 'I'},
1787 {"eabi", no_argument, NULL, 'Y'},
1788 {"perms", a_argument, NULL, 'O'},
1789 {"size", no_argument, NULL, 'Z'},
992 {"all", no_argument, NULL, 'a'}, 1790 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'}, 1791 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'}, 1792 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'}, 1793 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'}, 1794 {"from", a_argument, NULL, 'f'},
997 {"file", a_argument, NULL, 'o'}, 1795 {"file", a_argument, NULL, 'o'},
1796 {"nocolor", no_argument, NULL, 'C'},
998 {"nobanner", no_argument, NULL, 'B'}, 1797 {"nobanner", no_argument, NULL, 'B'},
999 {"help", no_argument, NULL, 'h'}, 1798 {"help", no_argument, NULL, 'h'},
1000 {"version", no_argument, NULL, 'V'}, 1799 {"version", no_argument, NULL, 'V'},
1001 {NULL, no_argument, NULL, 0x0} 1800 {NULL, no_argument, NULL, 0x0}
1002}; 1801};
1003 1802
1004static const char *opts_help[] = { 1803static const char * const opts_help[] = {
1005 "Scan all directories in PATH environment", 1804 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf", 1805 "Scan all directories in /etc/ld.so.conf",
1806 "Root directory (use with -l or -p)",
1007 "Scan directories recursively", 1807 "Scan directories recursively",
1008 "Don't recursively cross mount points", 1808 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n", 1809 "Don't scan symlinks",
1810 "Scan archives (.a files)",
1811 "Utilize ld.so.cache information (use with -r/-n)",
1812 "Try and 'fix' bad things (use with -r/-e)",
1813 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1010 "Print PaX markings", 1814 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings", 1815 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information", 1816 "Print TEXTREL information",
1013 "Print RPATH information", 1817 "Print RPATH information",
1014 "Print NEEDED information", 1818 "Print NEEDED information",
1015 "Print INTERP information", 1819 "Print INTERP information",
1016 "Print BIND information", 1820 "Print BIND information",
1017 "Print SONAME information", 1821 "Print SONAME information",
1018 "Find a specified symbol", 1822 "Find a specified symbol",
1823 "Find a specified section",
1019 "Find a specified library", 1824 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)", 1825 "Use strncmp to match libraries. (use with -N)",
1021 "Locate cause of TEXTREL", 1826 "Locate cause of TEXTREL",
1022 "Print all scanned info (-x -e -t -r -b)\n", 1827 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1828 "Print only ELF files matching numeric bits",
1829 "Print Endianness",
1830 "Print OSABI",
1831 "Print EABI (EM_ARM Only)",
1832 "Print only ELF files matching octal permissions",
1833 "Print ELF file size",
1834 "Print all useful/simple info\n",
1023 "Only output 'bad' things", 1835 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)", 1836 "Be verbose (can be specified more than once)",
1025 "Use specified format for output", 1837 "Use specified format for output",
1026 "Read input stream from a filename", 1838 "Read input stream from a filename",
1027 "Write output stream to a filename", 1839 "Write output stream to a filename",
1840 "Don't emit color in output",
1028 "Don't display the header", 1841 "Don't display the header",
1029 "Print this help and exit", 1842 "Print this help and exit",
1030 "Print version and exit", 1843 "Print version and exit",
1031 NULL 1844 NULL
1032}; 1845};
1034/* display usage and exit */ 1847/* display usage and exit */
1035static void usage(int status) 1848static void usage(int status)
1036{ 1849{
1037 unsigned long i; 1850 unsigned long i;
1038 printf("* Scan ELF binaries for stuff\n\n" 1851 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1852 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS); 1853 printf("Options: -[%s]\n", PARSE_FLAGS);
1041 for (i = 0; long_opts[i].name; ++i) 1854 for (i = 0; long_opts[i].name; ++i)
1042 if (long_opts[i].has_arg == no_argument) 1855 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1856 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1857 long_opts[i].name, opts_help[i]);
1858 else if (long_opts[i].val > '~')
1859 printf(" --%-7s <arg> * %s\n",
1044 long_opts[i].name, opts_help[i]); 1860 long_opts[i].name, opts_help[i]);
1045 else 1861 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1862 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]); 1863 long_opts[i].name, opts_help[i]);
1048 1864
1049 if (status != EXIT_SUCCESS) 1865 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); 1866 exit(status);
1063} 1867}
1064 1868
1065/* parse command line arguments and preform needed actions */ 1869/* parse command line arguments and preform needed actions */
1870#define do_pax_state(option, flag) \
1871 if (islower(option)) { \
1872 flags &= ~PF_##flag; \
1873 flags |= PF_NO##flag; \
1874 } else { \
1875 flags &= ~PF_NO##flag; \
1876 flags |= PF_##flag; \
1877 }
1066static void parseargs(int argc, char *argv[]) 1878static int parseargs(int argc, char *argv[])
1067{ 1879{
1068 int i; 1880 int i;
1069 char *from_file = NULL; 1881 const char *from_file = NULL;
1882 int ret = 0;
1070 1883
1071 opterr = 0; 1884 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1885 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) { 1886 switch (i) {
1074 1887
1078 VERSION, __FILE__, __DATE__, rcsid, argv0); 1891 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS); 1892 exit(EXIT_SUCCESS);
1080 break; 1893 break;
1081 case 'h': usage(EXIT_SUCCESS); break; 1894 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f': 1895 case 'f':
1083 if (from_file) err("Don't specify -f twice"); 1896 if (from_file) warn("You prob don't want to specify -f twice");
1084 from_file = xstrdup(optarg); 1897 from_file = optarg;
1898 break;
1899 case 'E':
1900 strncpy(match_etypes, optarg, sizeof(match_etypes));
1901 break;
1902 case 'M':
1903 match_bits = atoi(optarg);
1904 if (match_bits == 0) {
1905 if (strcmp(optarg, "ELFCLASS32") == 0)
1906 match_bits = 32;
1907 if (strcmp(optarg, "ELFCLASS64") == 0)
1908 match_bits = 64;
1909 }
1910 break;
1911 case 'O':
1912 if (sscanf(optarg, "%o", &match_perms) == -1)
1913 match_bits = 0;
1085 break; 1914 break;
1086 case 'o': { 1915 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1916 if (freopen(optarg, "w", stdout) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1917 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1090 SET_STDOUT(fp);
1091 break; 1918 break;
1092 } 1919 }
1093 1920 case 'k':
1921 if (find_section) warn("You prob don't want to specify -k twice");
1922 find_section = optarg;
1923 break;
1094 case 's': { 1924 case 's': {
1095 size_t len;
1096 if (find_sym) err("Don't specify -s twice"); 1925 if (find_sym) warn("You prob don't want to specify -s twice");
1097 find_sym = xstrdup(optarg); 1926 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; 1927 break;
1102 } 1928 }
1103 case 'N': { 1929 case 'N': {
1104 if (find_lib) err("Don't specify -N twice"); 1930 if (find_lib) warn("You prob don't want to specify -N twice");
1105 find_lib = xstrdup(optarg); 1931 find_lib = optarg;
1106 break; 1932 break;
1107 } 1933 }
1108 1934
1109 case 'F': { 1935 case 'F': {
1110 if (out_format) err("Don't specify -F twice"); 1936 if (out_format) warn("You prob don't want to specify -F twice");
1111 out_format = xstrdup(optarg); 1937 out_format = optarg;
1112 break; 1938 break;
1113 } 1939 }
1940 case 'z': {
1941 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1942 size_t x;
1114 1943
1944 for (x = 0; x < strlen(optarg); x++) {
1945 switch (optarg[x]) {
1946 case 'p':
1947 case 'P':
1948 do_pax_state(optarg[x], PAGEEXEC);
1949 break;
1950 case 's':
1951 case 'S':
1952 do_pax_state(optarg[x], SEGMEXEC);
1953 break;
1954 case 'm':
1955 case 'M':
1956 do_pax_state(optarg[x], MPROTECT);
1957 break;
1958 case 'e':
1959 case 'E':
1960 do_pax_state(optarg[x], EMUTRAMP);
1961 break;
1962 case 'r':
1963 case 'R':
1964 do_pax_state(optarg[x], RANDMMAP);
1965 break;
1966 case 'x':
1967 case 'X':
1968 do_pax_state(optarg[x], RANDEXEC);
1969 break;
1970 default:
1971 break;
1972 }
1973 }
1974 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1975 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1976 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1977 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1978 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1979 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1980 setpax = flags;
1981 break;
1982 }
1983 case 'Z': show_size = 1; break;
1115 case 'g': gmatch = 1; 1984 case 'g': g_match = 1; break;
1985 case 'L': use_ldcache = 1; break;
1116 case 'y': scan_symlink = 0; break; 1986 case 'y': scan_symlink = 0; break;
1987 case 'A': scan_archives = 1; break;
1988 case 'C': color_init(true); break;
1117 case 'B': show_banner = 0; break; 1989 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break; 1990 case 'l': scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break; 1991 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break; 1992 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break; 1993 case 'm': dir_crossmount = 0; break;
1994 case 'X': ++fix_elf; break;
1122 case 'x': show_pax = 1; break; 1995 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break; 1996 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break; 1997 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break; 1998 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break; 1999 case 'n': show_needed = 1; break;
1128 case 'b': show_bind = 1; break; 2001 case 'b': show_bind = 1; break;
1129 case 'S': show_soname = 1; break; 2002 case 'S': show_soname = 1; break;
1130 case 'T': show_textrels = 1; break; 2003 case 'T': show_textrels = 1; break;
1131 case 'q': be_quiet = 1; break; 2004 case 'q': be_quiet = 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2005 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2006 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1134 2007 case 'D': show_endian = 1; break;
2008 case 'I': show_osabi = 1; break;
2009 case 'Y': show_eabi = 1; break;
2010 case 128:
2011 root = optarg;
2012 break;
1135 case ':': 2013 case ':':
1136 err("Option missing parameter\n"); 2014 err("Option '%c' is missing parameter", optopt);
1137 case '?': 2015 case '?':
1138 err("Unknown option\n"); 2016 err("Unknown option '%c' or argument missing", optopt);
1139 default: 2017 default:
1140 err("Unhandled option '%c'", i); 2018 err("Unhandled option '%c'; please report this", i);
1141 }
1142 } 2019 }
1143 2020 }
2021 if (show_textrels && be_verbose) {
2022 if (which("objdump") != NULL)
2023 has_objdump = 1;
2024 }
1144 /* let the format option override all other options */ 2025 /* let the format option override all other options */
1145 if (out_format) { 2026 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \ 2027 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \ 2028 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0; 2029 show_textrels = show_perms = show_endian = show_size = \
2030 show_osabi = show_eabi = 0;
1149 for (i = 0; out_format[i]; ++i) { 2031 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue; 2032 if (!IS_MODIFIER(out_format[i])) continue;
1151 2033
1152 switch (out_format[++i]) { 2034 switch (out_format[++i]) {
2035 case '+': break;
1153 case '%': break; 2036 case '%': break;
1154 case '#': break; 2037 case '#': break;
1155 case 'F': break; 2038 case 'F': break;
1156 case 'p': break; 2039 case 'p': break;
1157 case 'f': break; 2040 case 'f': break;
2041 case 'k': break;
1158 case 's': break; 2042 case 's': break;
1159 case 'N': break; 2043 case 'N': break;
1160 case 'o': break; 2044 case 'o': break;
2045 case 'a': break;
2046 case 'M': break;
2047 case 'Z': show_size = 1; break;
2048 case 'D': show_endian = 1; break;
2049 case 'I': show_osabi = 1; break;
2050 case 'Y': show_eabi = 1; break;
2051 case 'O': show_perms = 1; break;
1161 case 'x': show_pax = 1; break; 2052 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break; 2053 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break; 2054 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break; 2055 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break; 2056 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break; 2057 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break; 2058 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break; 2059 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break; 2060 case 'T': show_textrels = 1; break;
1170 default: 2061 default:
1171 err("Invalid format specifier '%c' (byte %i)", 2062 err("Invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1); 2063 out_format[i], i+1);
1173 } 2064 }
1174 } 2065 }
1175 2066
1176 /* construct our default format */ 2067 /* construct our default format */
1177 } else { 2068 } else {
1178 size_t fmt_len = 30; 2069 size_t fmt_len = 30;
1179 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2070 out_format = xmalloc(sizeof(char) * fmt_len);
2071 *out_format = '\0';
1180 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2072 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1181 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2073 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2074 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2075 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2076 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2077 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2078 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1182 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2079 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1183 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2080 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1184 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2081 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1185 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2082 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2083 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2084 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2085 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2086 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2087 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2088 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2089 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2090 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 } 2091 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format); 2092 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195 2093
1196 /* now lets actually do the scanning */ 2094 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet)) 2095 if (scan_ldpath || use_ldcache)
1198 load_ld_so_conf(); 2096 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1199 if (scan_ldpath) scanelf_ldpath(); 2097 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath(); 2098 if (scan_envpath) scanelf_envpath();
2099 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2100 from_file = "-";
1201 if (from_file) { 2101 if (from_file) {
1202 scanelf_from_file(from_file); 2102 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv; 2103 from_file = *argv;
1205 } 2104 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2105 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?"); 2106 err("Nothing to scan !?");
1208 while (optind < argc) { 2107 while (optind < argc) {
1209 search_path = argv[optind++]; 2108 search_path = argv[optind++];
1210 scanelf_dir(search_path); 2109 ret = scanelf_dir(search_path);
1211 } 2110 }
1212 2111
1213 /* clean up */ 2112 /* clean up */
1214 if (find_sym) {
1215 free(find_sym);
1216 free(versioned_symname);
1217 }
1218 if (find_lib) free(find_lib);
1219 if (out_format) free(out_format);
1220 for (i = 0; ldpaths[i]; ++i) 2113 for (i = 0; ldpaths[i]; ++i)
1221 free(ldpaths[i]); 2114 free(ldpaths[i]);
1222}
1223 2115
1224 2116 if (ldcache != 0)
1225 2117 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; 2118 return ret;
1232} 2119}
1233 2120
1234static void *xmalloc(size_t size) 2121static char **get_split_env(const char *envvar)
1235{ 2122{
1236 void *ret = malloc(size); 2123 const char *delims = " \t\n";
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 2124 char **envvals = NULL;
1238 return ret; 2125 char *env, *s;
1239} 2126 int nentry;
1240 2127
1241static void xstrcat(char **dst, const char *src, size_t *curr_len) 2128 if ((env = getenv(envvar)) == NULL)
1242{ 2129 return NULL;
1243 size_t new_len;
1244 2130
1245 new_len = strlen(*dst) + strlen(src); 2131 env = xstrdup(env);
1246 if (*curr_len <= new_len) { 2132 if (env == NULL)
1247 *curr_len = new_len + (*curr_len / 2); 2133 return NULL;
1248 *dst = realloc(*dst, *curr_len);
1249 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len);
1251 }
1252 2134
1253 strcat(*dst, src); 2135 s = strtok(env, delims);
1254} 2136 if (s == NULL) {
2137 free(env);
2138 return NULL;
2139 }
1255 2140
1256static inline void xchrcat(char **dst, const char append, size_t *curr_len) 2141 nentry = 0;
1257{ 2142 while (s != NULL) {
1258 static char my_app[2]; 2143 ++nentry;
1259 my_app[0] = append; 2144 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1260 my_app[1] = '\0'; 2145 envvals[nentry-1] = s;
1261 xstrcat(dst, my_app, curr_len); 2146 s = strtok(NULL, delims);
1262} 2147 }
2148 envvals[nentry] = NULL;
1263 2149
2150 /* don't want to free(env) as it contains the memory that backs
2151 * the envvals array of strings */
2152 return envvals;
2153}
1264 2154
2155static void parseenv(void)
2156{
2157 color_init(false);
2158 qa_textrels = get_split_env("QA_TEXTRELS");
2159 qa_execstack = get_split_env("QA_EXECSTACK");
2160 qa_wx_load = get_split_env("QA_WX_LOAD");
2161}
2162
2163#ifdef __PAX_UTILS_CLEANUP
2164static void cleanup(void)
2165{
2166 free(out_format);
2167 free(qa_textrels);
2168 free(qa_execstack);
2169 free(qa_wx_load);
2170}
2171#endif
1265 2172
1266int main(int argc, char *argv[]) 2173int main(int argc, char *argv[])
1267{ 2174{
2175 int ret;
1268 if (argc < 2) 2176 if (argc < 2)
1269 usage(EXIT_FAILURE); 2177 usage(EXIT_FAILURE);
2178 parseenv();
1270 parseargs(argc, argv); 2179 ret = parseargs(argc, argv);
1271 fclose(stdout); 2180 fclose(stdout);
1272#ifdef __BOUNDS_CHECKING_ON 2181#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()"); 2182 cleanup();
2183 warn("The calls to add/delete heap should be off:\n"
2184 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2185 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1274#endif 2186#endif
1275 return EXIT_SUCCESS; 2187 return ret;
1276} 2188}
2189
2190/* Match filename against entries in matchlist, return TRUE
2191 * if the file is listed */
2192static int file_matches_list(const char *filename, char **matchlist)
2193{
2194 char **file;
2195 char *match;
2196 char buf[__PAX_UTILS_PATH_MAX];
2197
2198 if (matchlist == NULL)
2199 return 0;
2200
2201 for (file = matchlist; *file != NULL; file++) {
2202 if (search_path) {
2203 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2204 match = buf;
2205 } else {
2206 match = *file;
2207 }
2208 if (fnmatch(match, filename, 0) == 0)
2209 return 1;
2210 }
2211 return 0;
2212}

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