/[gentoo-projects]/pax-utils/scanelf.c
Gentoo

Diff of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

Revision 1.96 Revision 1.229
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 1.96 2005/12/28 22:26:47 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.229 2011/09/27 19:29:19 vapier Exp $
5 * 5 *
6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10#include <stdio.h> 10static const char *rcsid = "$Id: scanelf.c,v 1.229 2011/09/27 19:29:19 vapier Exp $";
11#include <stdlib.h> 11const char argv0[] = "scanelf";
12#include <sys/types.h> 12
13#include <libgen.h>
14#include <limits.h>
15#include <string.h>
16#include <errno.h>
17#include <unistd.h>
18#include <sys/stat.h>
19#include <sys/mman.h>
20#include <fcntl.h>
21#include <dirent.h>
22#include <getopt.h>
23#include <assert.h>
24#include "paxinc.h" 13#include "paxinc.h"
25 14
26static const char *rcsid = "$Id: scanelf.c,v 1.96 2005/12/28 22:26:47 solar Exp $";
27#define argv0 "scanelf"
28
29#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
30
31
32 16
33/* prototypes */ 17/* prototypes */
34static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
35static void scanelf_dir(const char *path);
36static void scanelf_ldpath();
37static void scanelf_envpath();
38static void usage(int status);
39static void parseargs(int argc, char *argv[]);
40static char *xstrdup(const char *s);
41static void *xmalloc(size_t size);
42static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
43#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
44static inline void xchrcat(char **dst, const char append, size_t *curr_len);
45 19
46/* variables to control behavior */ 20/* variables to control behavior */
47static char *ldpaths[256]; 21static char *match_etypes = NULL;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
48static char scan_ldpath = 0; 23static char scan_ldpath = 0;
49static char scan_envpath = 0; 24static char scan_envpath = 0;
50static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
51static char dir_recurse = 0; 27static char dir_recurse = 0;
52static char dir_crossmount = 1; 28static char dir_crossmount = 1;
53static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
31static char show_size = 0;
54static char show_phdr = 0; 32static char show_phdr = 0;
55static char show_textrel = 0; 33static char show_textrel = 0;
56static char show_rpath = 0; 34static char show_rpath = 0;
57static char show_needed = 0; 35static char show_needed = 0;
58static char show_interp = 0; 36static char show_interp = 0;
59static char show_bind = 0; 37static char show_bind = 0;
60static char show_soname = 0; 38static char show_soname = 0;
61static char show_textrels = 0; 39static char show_textrels = 0;
62static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
63static char be_quiet = 0; 44static char be_quiet = 0;
64static char be_verbose = 0; 45static char be_verbose = 0;
65static char be_wewy_wewy_quiet = 0; 46static char be_wewy_wewy_quiet = 0;
66static char *find_sym = NULL, *versioned_symname = NULL; 47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
67static char *find_lib = NULL; 49static char *find_lib = NULL;
50static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51static char *find_section = NULL;
52static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
68static char *out_format = NULL; 53static char *out_format = NULL;
69static char *search_path = NULL; 54static char *search_path = NULL;
55static char fix_elf = 0;
70static char gmatch = 0; 56static char g_match = 0;
71static char printcache = 0; 57static char use_ldcache = 0;
72 58
59static char **qa_textrels = NULL;
60static char **qa_execstack = NULL;
61static char **qa_wx_load = NULL;
62static char *root;
73 63
74caddr_t ldcache = 0; 64static int match_bits = 0;
65static unsigned int match_perms = 0;
66static void *ldcache = NULL;
75size_t ldcache_size = 0; 67static size_t ldcache_size = 0;
68static unsigned long setpax = 0UL;
69
70static int has_objdump = 0;
71
72/* find the path to a file by name */
73static char *which(const char *fname)
74{
75 static char fullpath[__PAX_UTILS_PATH_MAX];
76 char *path, *p;
77
78 path = getenv("PATH");
79 if (!path)
80 return NULL;
81
82 path = xstrdup(path);
83 while ((p = strrchr(path, ':')) != NULL) {
84 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
85 *p = 0;
86 if (access(fullpath, R_OK) != -1) {
87 free(path);
88 return fullpath;
89 }
90 }
91 free(path);
92 return NULL;
93}
94
95/* 1 on failure. 0 otherwise */
96static int rematch(const char *regex, const char *match, int cflags)
97{
98 regex_t preg;
99 int ret;
100
101 if ((match == NULL) || (regex == NULL))
102 return EXIT_FAILURE;
103
104 if ((ret = regcomp(&preg, regex, cflags))) {
105 char err[256];
106
107 if (regerror(ret, &preg, err, sizeof(err)))
108 fprintf(stderr, "regcomp failed: %s", err);
109 else
110 fprintf(stderr, "regcomp failed");
111
112 return EXIT_FAILURE;
113 }
114 ret = regexec(&preg, match, 0, NULL, 0);
115 regfree(&preg);
116
117 return ret;
118}
76 119
77/* sub-funcs for scanelf_file() */ 120/* sub-funcs for scanelf_file() */
78static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 121static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
79{ 122{
80 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 123 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
124
125 /* debug sections */
126 void *symtab = elf_findsecbyname(elf, ".symtab");
127 void *strtab = elf_findsecbyname(elf, ".strtab");
128 /* runtime sections */
129 void *dynsym = elf_findsecbyname(elf, ".dynsym");
130 void *dynstr = elf_findsecbyname(elf, ".dynstr");
131
81#define GET_SYMTABS(B) \ 132#define GET_SYMTABS(B) \
82 if (elf->elf_class == ELFCLASS ## B) { \ 133 if (elf->elf_class == ELFCLASS ## B) { \
83 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
84 /* debug sections */ \
85 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
86 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
87 /* runtime sections */ \
88 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
89 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
90 if (symtab && dynsym) { \ 134 if (symtab && dynsym) { \
135 Elf ## B ## _Shdr *esymtab = symtab; \
136 Elf ## B ## _Shdr *edynsym = dynsym; \
91 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 137 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
92 } else { \ 138 } else \
93 *sym = (void*)(symtab ? symtab : dynsym); \ 139 *sym = symtab ? symtab : dynsym; \
94 } \
95 if (strtab && dynstr) { \ 140 if (strtab && dynstr) { \
141 Elf ## B ## _Shdr *estrtab = strtab; \
142 Elf ## B ## _Shdr *edynstr = dynstr; \
96 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 143 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
97 } else { \ 144 } else \
98 *tab = (void*)(strtab ? strtab : dynstr); \ 145 *tab = strtab ? strtab : dynstr; \
99 } \
100 } 146 }
101 GET_SYMTABS(32) 147 GET_SYMTABS(32)
102 GET_SYMTABS(64) 148 GET_SYMTABS(64)
103} 149}
150
104static char *scanelf_file_pax(elfobj *elf, char *found_pax) 151static char *scanelf_file_pax(elfobj *elf, char *found_pax)
105{ 152{
106 static char ret[7]; 153 static char ret[7];
107 unsigned long i, shown; 154 unsigned long i, shown;
108 155
117 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 164 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
118 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
119 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 166 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
120 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 167 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
121 continue; \ 168 continue; \
122 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 169 if (fix_elf && setpax) { \
170 /* set the paxctl flags */ \
171 ESET(phdr[i].p_flags, setpax); \
172 } \
173 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
123 continue; \ 174 continue; \
124 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 175 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
125 *found_pax = 1; \ 176 *found_pax = 1; \
126 ++shown; \ 177 ++shown; \
127 break; \ 178 break; \
128 } \ 179 } \
129 } 180 }
130 SHOW_PAX(32) 181 SHOW_PAX(32)
131 SHOW_PAX(64) 182 SHOW_PAX(64)
183 }
184
185 if (fix_elf && setpax) {
186 /* set the chpax settings */
187 if (elf->elf_class == ELFCLASS32) {
188 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
189 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
190 } else {
191 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
192 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
193 }
132 } 194 }
133 195
134 /* fall back to EI_PAX if no PT_PAX was found */ 196 /* fall back to EI_PAX if no PT_PAX was found */
135 if (!*ret) { 197 if (!*ret) {
136 static char *paxflags; 198 static char *paxflags;
150 212
151static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 213static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
152{ 214{
153 static char ret[12]; 215 static char ret[12];
154 char *found; 216 char *found;
155 unsigned long i, shown;
156 unsigned char multi_stack, multi_relro, multi_load; 217 unsigned long i, shown, multi_stack, multi_relro, multi_load;
218 int max_pt_load;
157 219
158 if (!show_phdr) return NULL; 220 if (!show_phdr) return NULL;
159 221
160 memcpy(ret, "--- --- ---\0", 12); 222 memcpy(ret, "--- --- ---\0", 12);
161 223
162 shown = 0; 224 shown = 0;
163 multi_stack = multi_relro = multi_load = 0; 225 multi_stack = multi_relro = multi_load = 0;
226 max_pt_load = elf_max_pt_load(elf);
164 227
228#define NOTE_GNU_STACK ".note.GNU-stack"
165#define SHOW_PHDR(B) \ 229#define SHOW_PHDR(B) \
166 if (elf->elf_class == ELFCLASS ## B) { \ 230 if (elf->elf_class == ELFCLASS ## B) { \
167 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 231 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
168 Elf ## B ## _Off offset; \ 232 Elf ## B ## _Off offset; \
169 uint32_t flags, check_flags; \ 233 uint32_t flags, check_flags; \
170 if (elf->phdr != NULL) { \ 234 if (elf->phdr != NULL) { \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 236 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
173 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 237 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
238 if (multi_stack++) \
174 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 239 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
240 if (file_matches_list(elf->filename, qa_execstack)) \
241 continue; \
175 found = found_phdr; \ 242 found = found_phdr; \
176 offset = 0; \ 243 offset = 0; \
177 check_flags = PF_X; \ 244 check_flags = PF_X; \
178 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 245 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
246 if (multi_relro++) \
179 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 247 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
180 found = found_relro; \ 248 found = found_relro; \
181 offset = 4; \ 249 offset = 4; \
182 check_flags = PF_X; \ 250 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 251 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
184 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 252 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
253 if (multi_load++ > max_pt_load) \
254 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
255 if (file_matches_list(elf->filename, qa_wx_load)) \
256 continue; \
185 found = found_load; \ 257 found = found_load; \
186 offset = 8; \ 258 offset = 8; \
187 check_flags = PF_W|PF_X; \ 259 check_flags = PF_W|PF_X; \
188 } else \ 260 } else \
189 continue; \ 261 continue; \
190 flags = EGET(phdr[i].p_flags); \ 262 flags = EGET(phdr[i].p_flags); \
191 if (be_quiet && ((flags & check_flags) != check_flags)) \ 263 if (be_quiet && ((flags & check_flags) != check_flags)) \
192 continue; \ 264 continue; \
265 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
266 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
267 ret[3] = ret[7] = '!'; \
268 flags = EGET(phdr[i].p_flags); \
269 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 270 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
194 *found = 1; \ 271 *found = 1; \
195 ++shown; \ 272 ++shown; \
196 } \ 273 } \
197 } else if (elf->shdr != NULL) { \ 274 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 275 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 276 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 277 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
278 char *str; \
279 if ((void*)strtbl > elf->data_end) \
280 goto skip_this_shdr##B; \
201 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 281 check_flags = SHF_WRITE|SHF_EXECINSTR; \
202 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 282 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
203 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 283 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
204 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 284 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
205 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 285 str = elf->data + offset; \
286 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
287 if (!strcmp(str, NOTE_GNU_STACK)) { \
206 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 288 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
207 flags = EGET(shdr[i].sh_flags); \ 289 flags = EGET(shdr[i].sh_flags); \
208 if (be_quiet && ((flags & check_flags) != check_flags)) \ 290 if (be_quiet && ((flags & check_flags) != check_flags)) \
209 continue; \ 291 continue; \
210 ++*found_phdr; \ 292 ++*found_phdr; \
214 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 296 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
215 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 297 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
216 break; \ 298 break; \
217 } \ 299 } \
218 } \ 300 } \
301 skip_this_shdr##B: \
219 if (!multi_stack) { \ 302 if (!multi_stack) { \
303 if (file_matches_list(elf->filename, qa_execstack)) \
304 return NULL; \
220 *found_phdr = 1; \ 305 *found_phdr = 1; \
221 shown = 1; \ 306 shown = 1; \
222 memcpy(ret, "!WX", 3); \ 307 memcpy(ret, "!WX", 3); \
223 } \ 308 } \
224 } \ 309 } \
229 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 314 if (be_wewy_wewy_quiet || (be_quiet && !shown))
230 return NULL; 315 return NULL;
231 else 316 else
232 return ret; 317 return ret;
233} 318}
319
320/*
321 * See if this ELF contains a DT_TEXTREL tag in any of its
322 * PT_DYNAMIC sections.
323 */
234static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 324static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
235{ 325{
236 static const char *ret = "TEXTREL"; 326 static const char *ret = "TEXTREL";
237 unsigned long i; 327 unsigned long i;
238 328
239 if (!show_textrel && !show_textrels) return NULL; 329 if (!show_textrel && !show_textrels) return NULL;
330
331 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
240 332
241 if (elf->phdr) { 333 if (elf->phdr) {
242#define SHOW_TEXTREL(B) \ 334#define SHOW_TEXTREL(B) \
243 if (elf->elf_class == ELFCLASS ## B) { \ 335 if (elf->elf_class == ELFCLASS ## B) { \
244 Elf ## B ## _Dyn *dyn; \ 336 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 337 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 338 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Off offset; \ 339 Elf ## B ## _Off offset; \
248 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 340 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
249 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 341 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
250 offset = EGET(phdr[i].p_offset); \ 342 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 343 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
252 dyn = DYN ## B (elf->data + offset); \ 344 dyn = DYN ## B (elf->vdata + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \ 345 while (EGET(dyn->d_tag) != DT_NULL) { \
254 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 346 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
255 *found_textrel = 1; \ 347 *found_textrel = 1; \
256 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 348 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
257 return (be_wewy_wewy_quiet ? NULL : ret); \ 349 return (be_wewy_wewy_quiet ? NULL : ret); \
266 if (be_quiet || be_wewy_wewy_quiet) 358 if (be_quiet || be_wewy_wewy_quiet)
267 return NULL; 359 return NULL;
268 else 360 else
269 return " - "; 361 return " - ";
270} 362}
363
364/*
365 * Scan the .text section to see if there are any relocations in it.
366 * Should rewrite this to check PT_LOAD sections that are marked
367 * Executable rather than the section named '.text'.
368 */
271static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 369static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
272{ 370{
273 unsigned long s, r, rmax; 371 unsigned long s, r, rmax;
274 void *symtab_void, *strtab_void, *text_void; 372 void *symtab_void, *strtab_void, *text_void;
275 373
296 Elf ## B ## _Rela *rela; \ 394 Elf ## B ## _Rela *rela; \
297 /* search the section headers for relocations */ \ 395 /* search the section headers for relocations */ \
298 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 396 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
299 uint32_t sh_type = EGET(shdr[s].sh_type); \ 397 uint32_t sh_type = EGET(shdr[s].sh_type); \
300 if (sh_type == SHT_REL) { \ 398 if (sh_type == SHT_REL) { \
301 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 399 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
302 rela = NULL; \ 400 rela = NULL; \
303 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 401 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
304 } else if (sh_type == SHT_RELA) { \ 402 } else if (sh_type == SHT_RELA) { \
305 rel = NULL; \ 403 rel = NULL; \
306 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 404 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
307 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 405 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
308 } else \ 406 } else \
309 continue; \ 407 continue; \
310 /* now see if any of the relocs are in the .text */ \ 408 /* now see if any of the relocs are in the .text */ \
311 for (r = 0; r < rmax; ++r) { \ 409 for (r = 0; r < rmax; ++r) { \
326 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 424 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
327 if (be_verbose <= 2) continue; \ 425 if (be_verbose <= 2) continue; \
328 } else \ 426 } else \
329 *found_textrels = 1; \ 427 *found_textrels = 1; \
330 /* locate this relocation symbol name */ \ 428 /* locate this relocation symbol name */ \
331 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 429 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
430 if ((void*)sym > elf->data_end) { \
431 warn("%s: corrupt ELF symbol", elf->filename); \
432 continue; \
433 } \
332 sym_max = ELF ## B ## _R_SYM(r_info); \ 434 sym_max = ELF ## B ## _R_SYM(r_info); \
333 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 435 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
334 sym += sym_max; \ 436 sym += sym_max; \
335 else \ 437 else \
336 sym = NULL; \ 438 sym = NULL; \
337 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 439 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
338 /* show the raw details about this reloc */ \ 440 /* show the raw details about this reloc */ \
339 printf(" %s: ", elf->base_filename); \ 441 printf(" %s: ", elf->base_filename); \
340 if (sym && sym->st_name) \ 442 if (sym && sym->st_name) \
341 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 443 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
342 else \ 444 else \
343 printf("(memory/fake?)"); \ 445 printf("(memory/data?)"); \
344 printf(" [0x%lX]", (unsigned long)r_offset); \ 446 printf(" [0x%lX]", (unsigned long)r_offset); \
345 /* now try to find the closest symbol that this rel is probably in */ \ 447 /* now try to find the closest symbol that this rel is probably in */ \
346 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 448 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
347 func = NULL; \ 449 func = NULL; \
348 offset_tmp = 0; \ 450 offset_tmp = 0; \
349 while (sym_max--) { \ 451 while (sym_max--) { \
350 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 452 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
351 func = sym; \ 453 func = sym; \
352 offset_tmp = EGET(sym->st_value); \ 454 offset_tmp = EGET(sym->st_value); \
353 } \ 455 } \
354 ++sym; \ 456 ++sym; \
355 } \ 457 } \
356 printf(" in "); \ 458 printf(" in "); \
357 if (func && func->st_name) \ 459 if (func && func->st_name) { \
358 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 460 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
461 if (r_offset > EGET(func->st_size)) \
462 printf("(optimized out: previous %s)", func_name); \
359 else \ 463 else \
360 printf("(NULL: fake?)"); \ 464 printf("%s", func_name); \
465 } else \
466 printf("(optimized out)"); \
361 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 467 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
468 if (be_verbose && has_objdump) { \
469 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
470 char *sysbuf; \
471 size_t syslen; \
472 int sysret; \
473 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"; \
474 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
475 sysbuf = xmalloc(syslen); \
476 if (end_addr < r_offset) \
477 /* not uncommon when things are optimized out */ \
478 end_addr = r_offset + 0x100; \
479 snprintf(sysbuf, syslen, sysfmt, \
480 (unsigned long)offset_tmp, \
481 (unsigned long)end_addr, \
482 elf->filename, \
483 (unsigned long)r_offset); \
484 fflush(stdout); \
485 sysret = system(sysbuf); \
486 fflush(stdout); \
487 free(sysbuf); \
488 } \
362 } \ 489 } \
363 } } 490 } }
364 SHOW_TEXTRELS(32) 491 SHOW_TEXTRELS(32)
365 SHOW_TEXTRELS(64) 492 SHOW_TEXTRELS(64)
366 } 493 }
368 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 495 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
369 496
370 return NULL; 497 return NULL;
371} 498}
372 499
373static void rpath_security_checks(elfobj *, char *);
374static void rpath_security_checks(elfobj *elf, char *item) { 500static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
501{
375 struct stat st; 502 struct stat st;
376 switch (*item) { 503 switch (*item) {
377 case '/': break; 504 case '/': break;
378 case '.': 505 case '.':
379 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 506 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
380 break; 507 break;
508 case ':':
381 case '\0': 509 case '\0':
382 warnf("Security problem NULL RPATH in %s", elf->filename); 510 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
383 break; 511 break;
384 case '$': 512 case '$':
385 if (fstat(elf->fd, &st) != -1) 513 if (fstat(elf->fd, &st) != -1)
386 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 514 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
387 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 515 warnf("Security problem with %s='%s' in %s with mode set of %o",
388 item, elf->filename, st.st_mode & 07777); 516 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
389 break; 517 break;
390 default: 518 default:
391 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 519 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
392 break; 520 break;
393 } 521 }
394} 522}
395static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 523static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
396{ 524{
397 unsigned long i, s; 525 unsigned long i;
398 char *rpath, *runpath, **r; 526 char *rpath, *runpath, **r;
399 void *strtbl_void; 527 void *strtbl_void;
400 528
401 if (!show_rpath) return; 529 if (!show_rpath) return;
402 530
413 Elf ## B ## _Off offset; \ 541 Elf ## B ## _Off offset; \
414 Elf ## B ## _Xword word; \ 542 Elf ## B ## _Xword word; \
415 /* Scan all the program headers */ \ 543 /* Scan all the program headers */ \
416 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
417 /* Just scan dynamic headers */ \ 545 /* Just scan dynamic headers */ \
418 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 546 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
419 offset = EGET(phdr[i].p_offset); \ 547 offset = EGET(phdr[i].p_offset); \
420 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
421 /* Just scan dynamic RPATH/RUNPATH headers */ \ 549 /* Just scan dynamic RPATH/RUNPATH headers */ \
422 dyn = DYN ## B (elf->data + offset); \ 550 dyn = DYN ## B (elf->vdata + offset); \
423 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
424 if (word == DT_RPATH) { \ 552 if (word == DT_RPATH) { \
425 r = &rpath; \ 553 r = &rpath; \
426 } else if (word == DT_RUNPATH) { \ 554 } else if (word == DT_RUNPATH) { \
427 r = &runpath; \ 555 r = &runpath; \
431 } \ 559 } \
432 /* Verify the memory is somewhat sane */ \ 560 /* Verify the memory is somewhat sane */ \
433 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
434 if (offset < (Elf ## B ## _Off)elf->len) { \ 562 if (offset < (Elf ## B ## _Off)elf->len) { \
435 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
436 *r = (char*)(elf->data + offset); \ 564 *r = elf->data + offset; \
565 /* cache the length in case we need to nuke this section later on */ \
566 if (fix_elf) \
567 offset = strlen(*r); \
437 /* If quiet, don't output paths in ld.so.conf */ \ 568 /* If quiet, don't output paths in ld.so.conf */ \
438 if (be_quiet) { \ 569 if (be_quiet) { \
439 size_t len; \ 570 size_t len; \
440 char *start, *end; \ 571 char *start, *end; \
441 /* note that we only 'chop' off leading known paths. */ \ 572 /* note that we only 'chop' off leading known paths. */ \
442 /* since *r is read-only memory, we can only move the ptr forward. */ \ 573 /* since *r is read-only memory, we can only move the ptr forward. */ \
443 start = *r; \ 574 start = *r; \
444 /* scan each path in : delimited list */ \ 575 /* scan each path in : delimited list */ \
445 while (start) { \ 576 while (start) { \
446 rpath_security_checks(elf, start); \ 577 rpath_security_checks(elf, start, get_elfdtype(word)); \
447 end = strchr(start, ':'); \ 578 end = strchr(start, ':'); \
448 len = (end ? abs(end - start) : strlen(start)); \ 579 len = (end ? abs(end - start) : strlen(start)); \
449 for (s = 0; ldpaths[s]; ++s) { \ 580 if (use_ldcache) { \
581 size_t n; \
582 const char *ldpath; \
583 array_for_each(ldpaths, n, ldpath) \
450 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 584 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
451 *r = (end ? end + 1 : NULL); \ 585 *r = end; \
586 /* corner case ... if RPATH reads "/usr/lib:", we want \
587 * to show ':' rather than '' */ \
588 if (end && end[1] != '\0') \
589 (*r)++; \
452 break; \ 590 break; \
453 } \ 591 } \
454 } \ 592 } \
455 if (!*r || !ldpaths[s] || !end) \ 593 if (!*r || !end) \
456 start = NULL; \ 594 break; \
457 else \ 595 else \
458 start = start + len + 1; \ 596 start = start + len + 1; \
459 } \ 597 } \
460 } \ 598 } \
599 if (*r) { \
600 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
601 /* just nuke it */ \
602 nuke_it##B: \
603 memset(*r, 0x00, offset); \
604 *r = NULL; \
605 ESET(dyn->d_tag, DT_DEBUG); \
606 ESET(dyn->d_un.d_ptr, 0); \
607 } else if (fix_elf) { \
608 /* try to clean "bad" paths */ \
609 size_t len, tmpdir_len; \
610 char *start, *end; \
611 const char *tmpdir; \
612 start = *r; \
613 tmpdir = (getenv("TMPDIR") ? : "."); \
614 tmpdir_len = strlen(tmpdir); \
615 while (1) { \
616 end = strchr(start, ':'); \
617 if (start == end) { \
618 eat_this_path##B: \
619 len = strlen(end); \
620 memmove(start, end+1, len); \
621 start[len-1] = '\0'; \
622 end = start - 1; \
623 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
624 if (!end) { \
625 if (start == *r) \
626 goto nuke_it##B; \
627 *--start = '\0'; \
628 } else \
629 goto eat_this_path##B; \
630 } \
631 if (!end) \
632 break; \
633 start = end + 1; \
634 } \
635 if (**r == '\0') \
636 goto nuke_it##B; \
637 } \
638 if (*r) \
461 if (*r) *found_rpath = 1; \ 639 *found_rpath = 1; \
640 } \
462 } \ 641 } \
463 ++dyn; \ 642 ++dyn; \
464 } \ 643 } \
465 } } 644 } }
466 SHOW_RPATH(32) 645 SHOW_RPATH(32)
488 667
489#define LDSO_CACHE_MAGIC "ld.so-" 668#define LDSO_CACHE_MAGIC "ld.so-"
490#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 669#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
491#define LDSO_CACHE_VER "1.7.0" 670#define LDSO_CACHE_VER "1.7.0"
492#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 671#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
672#define FLAG_ANY -1
673#define FLAG_TYPE_MASK 0x00ff
674#define FLAG_LIBC4 0x0000
675#define FLAG_ELF 0x0001
676#define FLAG_ELF_LIBC5 0x0002
677#define FLAG_ELF_LIBC6 0x0003
678#define FLAG_REQUIRED_MASK 0xff00
679#define FLAG_SPARC_LIB64 0x0100
680#define FLAG_IA64_LIB64 0x0200
681#define FLAG_X8664_LIB64 0x0300
682#define FLAG_S390_LIB64 0x0400
683#define FLAG_POWERPC_LIB64 0x0500
684#define FLAG_MIPS64_LIBN32 0x0600
685#define FLAG_MIPS64_LIBN64 0x0700
493 686
494static char *lookup_cache_lib(char *); 687#if defined(__GLIBC__) || defined(__UCLIBC__)
688
495static char *lookup_cache_lib(char *fname) 689static char *lookup_cache_lib(elfobj *elf, char *fname)
496{ 690{
497 int fd = 0; 691 int fd;
498 char *strs; 692 char *strs;
499 static char buf[_POSIX_PATH_MAX] = ""; 693 static char buf[__PAX_UTILS_PATH_MAX] = "";
500 const char *cachefile = "/etc/ld.so.cache"; 694 const char cachefile[] = "/etc/ld.so.cache";
501 struct stat st; 695 struct stat st;
502 696
503 typedef struct { 697 typedef struct {
504 char magic[LDSO_CACHE_MAGIC_LEN]; 698 char magic[LDSO_CACHE_MAGIC_LEN];
505 char version[LDSO_CACHE_VER_LEN]; 699 char version[LDSO_CACHE_VER_LEN];
506 int nlibs; 700 int nlibs;
507 } header_t; 701 } header_t;
702 header_t *header;
508 703
509 typedef struct { 704 typedef struct {
510 int flags; 705 int flags;
511 int sooffset; 706 int sooffset;
512 int liboffset; 707 int liboffset;
513 } libentry_t; 708 } libentry_t;
514
515 header_t *header;
516 libentry_t *libent; 709 libentry_t *libent;
517 710
518 if (fname == NULL) 711 if (fname == NULL)
519 return NULL; 712 return NULL;
520 713
521 if (ldcache == 0) { 714 if (ldcache == NULL) {
522 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) < 0) 715 if (stat(cachefile, &st))
523 return NULL; 716 return NULL;
524 /* save the cache size for latter unmapping */ 717
718 fd = open(cachefile, O_RDONLY);
719 if (fd == -1)
720 return NULL;
721
722 /* cache these values so we only map/unmap the cache file once */
525 ldcache_size = st.st_size; 723 ldcache_size = st.st_size;
724 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
725 close(fd);
526 726
527 if ((ldcache = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0)) == (caddr_t) -1) 727 if (ldcache == MAP_FAILED) {
728 ldcache = NULL;
528 return NULL; 729 return NULL;
730 }
529 731
530 close(fd);
531
532 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 732 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
733 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
734 {
735 munmap(ldcache, ldcache_size);
736 ldcache = NULL;
533 return NULL; 737 return NULL;
534
535 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
536 return NULL;
537 } 738 }
739 } else
740 header = ldcache;
538 741
539 header = (header_t *) ldcache;
540 libent = (libentry_t *) (ldcache + sizeof(header_t)); 742 libent = ldcache + sizeof(header_t);
541 strs = (char *) &libent[header->nlibs]; 743 strs = (char *) &libent[header->nlibs];
542 744
543 for (fd = 0; fd < header->nlibs; fd++) { 745 for (fd = 0; fd < header->nlibs; ++fd) {
746 /* This should be more fine grained, but for now we assume that
747 * diff arches will not be cached together, and we ignore the
748 * the different multilib mips cases.
749 */
750 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
751 continue;
752 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
753 continue;
754
544 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 755 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
545 continue; 756 continue;
757
758 /* Return first hit because that is how the ldso rolls */
546 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 759 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
760 break;
547 } 761 }
762
548 return buf; 763 return buf;
549} 764}
550 765
766#elif defined(__NetBSD__)
767static char *lookup_cache_lib(elfobj *elf, char *fname)
768{
769 static char buf[__PAX_UTILS_PATH_MAX] = "";
770 static struct stat st;
771 size_t n;
772 char *ldpath;
773
774 array_for_each(ldpath, n, ldpath) {
775 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
776 continue; /* if the pathname is too long, or something went wrong, ignore */
777
778 if (stat(buf, &st) != 0)
779 continue; /* if the lib doesn't exist in *ldpath, look further */
780
781 /* NetBSD doesn't actually do sanity checks, it just loads the file
782 * and if that doesn't work, continues looking in other directories.
783 * This cannot easily be safely emulated, unfortunately. For now,
784 * just assume that if it exists, it's a valid library. */
785
786 return buf;
787 }
788
789 /* not found in any path */
790 return NULL;
791}
792#else
793#ifdef __ELF__
794#warning Cache support not implemented for your target
795#endif
796static char *lookup_cache_lib(elfobj *elf, char *fname)
797{
798 return NULL;
799}
800#endif
551 801
552static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 802static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
553{ 803{
554 unsigned long i; 804 unsigned long i;
555 char *needed; 805 char *needed;
556 void *strtbl_void; 806 void *strtbl_void;
557 char *p; 807 char *p;
558 808
809 /*
810 * -n -> op==0 -> print all
811 * -N -> op==1 -> print requested
812 */
559 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 813 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
814 return NULL;
560 815
561 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 816 strtbl_void = elf_findsecbyname(elf, ".dynstr");
562 817
563 if (elf->phdr && strtbl_void) { 818 if (elf->phdr && strtbl_void) {
564#define SHOW_NEEDED(B) \ 819#define SHOW_NEEDED(B) \
566 Elf ## B ## _Dyn *dyn; \ 821 Elf ## B ## _Dyn *dyn; \
567 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 822 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
568 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 823 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
569 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 824 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
570 Elf ## B ## _Off offset; \ 825 Elf ## B ## _Off offset; \
826 size_t matched = 0; \
827 /* Walk all the program headers to find the PT_DYNAMIC */ \
571 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 828 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
572 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 829 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
830 continue; \
573 offset = EGET(phdr[i].p_offset); \ 831 offset = EGET(phdr[i].p_offset); \
574 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 832 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
833 continue; \
834 /* Walk all the dynamic tags to find NEEDED entries */ \
575 dyn = DYN ## B (elf->data + offset); \ 835 dyn = DYN ## B (elf->vdata + offset); \
576 while (EGET(dyn->d_tag) != DT_NULL) { \ 836 while (EGET(dyn->d_tag) != DT_NULL) { \
577 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 837 if (EGET(dyn->d_tag) == DT_NEEDED) { \
578 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 838 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
579 if (offset >= (Elf ## B ## _Off)elf->len) { \ 839 if (offset >= (Elf ## B ## _Off)elf->len) { \
580 ++dyn; \ 840 ++dyn; \
581 continue; \ 841 continue; \
582 } \ 842 } \
583 needed = (char*)(elf->data + offset); \ 843 needed = elf->data + offset; \
584 if (op == 0) { \ 844 if (op == 0) { \
845 /* -n -> print all entries */ \
585 if (!be_wewy_wewy_quiet) { \ 846 if (!be_wewy_wewy_quiet) { \
586 if (*found_needed) xchrcat(ret, ',', ret_len); \ 847 if (*found_needed) xchrcat(ret, ',', ret_len); \
587 if (printcache) \ 848 if (use_ldcache) \
588 if ((p = lookup_cache_lib(needed)) != NULL) \ 849 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
589 needed = p; \ 850 needed = p; \
590 xstrcat(ret, needed, ret_len); \ 851 xstrcat(ret, needed, ret_len); \
591 } \ 852 } \
592 *found_needed = 1; \ 853 *found_needed = 1; \
593 } else { \ 854 } else { \
594 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 855 /* -N -> print matching entries */ \
856 size_t n; \
857 const char *find_lib_name; \
858 \
859 array_for_each(find_lib_arr, n, find_lib_name) \
860 if (!strcmp(find_lib_name, needed)) \
861 ++matched; \
862 \
863 if (matched == array_cnt(find_lib_arr)) { \
595 *found_lib = 1; \ 864 *found_lib = 1; \
596 return (be_wewy_wewy_quiet ? NULL : needed); \ 865 return (be_wewy_wewy_quiet ? NULL : find_lib); \
597 } \ 866 } \
598 } \ 867 } \
599 } \ 868 } \
600 ++dyn; \ 869 ++dyn; \
601 } \ 870 } \
630} 899}
631static char *scanelf_file_bind(elfobj *elf, char *found_bind) 900static char *scanelf_file_bind(elfobj *elf, char *found_bind)
632{ 901{
633 unsigned long i; 902 unsigned long i;
634 struct stat s; 903 struct stat s;
904 char dynamic = 0;
635 905
636 if (!show_bind) return NULL; 906 if (!show_bind) return NULL;
637 if (!elf->phdr) return NULL; 907 if (!elf->phdr) return NULL;
638 908
639#define SHOW_BIND(B) \ 909#define SHOW_BIND(B) \
641 Elf ## B ## _Dyn *dyn; \ 911 Elf ## B ## _Dyn *dyn; \
642 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 912 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
643 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 913 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
644 Elf ## B ## _Off offset; \ 914 Elf ## B ## _Off offset; \
645 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 915 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
646 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 916 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
917 dynamic = 1; \
647 offset = EGET(phdr[i].p_offset); \ 918 offset = EGET(phdr[i].p_offset); \
648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 919 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
649 dyn = DYN ## B (elf->data + offset); \ 920 dyn = DYN ## B (elf->vdata + offset); \
650 while (EGET(dyn->d_tag) != DT_NULL) { \ 921 while (EGET(dyn->d_tag) != DT_NULL) { \
651 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 922 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
652 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 923 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
653 { \ 924 { \
654 if (be_quiet) return NULL; \ 925 if (be_quiet) return NULL; \
662 SHOW_BIND(32) 933 SHOW_BIND(32)
663 SHOW_BIND(64) 934 SHOW_BIND(64)
664 935
665 if (be_wewy_wewy_quiet) return NULL; 936 if (be_wewy_wewy_quiet) return NULL;
666 937
938 /* don't output anything if quiet mode and the ELF is static or not setuid */
667 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 939 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
668 return NULL; 940 return NULL;
669 } else { 941 } else {
670 *found_bind = 1; 942 *found_bind = 1;
671 return (char *) "LAZY"; 943 return (char *)(dynamic ? "LAZY" : "STATIC");
672 } 944 }
673} 945}
674static char *scanelf_file_soname(elfobj *elf, char *found_soname) 946static char *scanelf_file_soname(elfobj *elf, char *found_soname)
675{ 947{
676 unsigned long i; 948 unsigned long i;
688 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 960 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
689 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 961 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
690 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 962 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
691 Elf ## B ## _Off offset; \ 963 Elf ## B ## _Off offset; \
692 /* only look for soname in shared objects */ \ 964 /* only look for soname in shared objects */ \
693 if (ehdr->e_type != ET_DYN) \ 965 if (EGET(ehdr->e_type) != ET_DYN) \
694 return NULL; \ 966 return NULL; \
695 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 967 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
696 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 968 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
697 offset = EGET(phdr[i].p_offset); \ 969 offset = EGET(phdr[i].p_offset); \
698 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 970 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
699 dyn = DYN ## B (elf->data + offset); \ 971 dyn = DYN ## B (elf->vdata + offset); \
700 while (EGET(dyn->d_tag) != DT_NULL) { \ 972 while (EGET(dyn->d_tag) != DT_NULL) { \
701 if (EGET(dyn->d_tag) == DT_SONAME) { \ 973 if (EGET(dyn->d_tag) == DT_SONAME) { \
702 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 974 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
703 if (offset >= (Elf ## B ## _Off)elf->len) { \ 975 if (offset >= (Elf ## B ## _Off)elf->len) { \
704 ++dyn; \ 976 ++dyn; \
705 continue; \ 977 continue; \
706 } \ 978 } \
707 soname = (char*)(elf->data + offset); \ 979 soname = elf->data + offset; \
708 *found_soname = 1; \ 980 *found_soname = 1; \
709 return (be_wewy_wewy_quiet ? NULL : soname); \ 981 return (be_wewy_wewy_quiet ? NULL : soname); \
710 } \ 982 } \
711 ++dyn; \ 983 ++dyn; \
712 } \ 984 } \
715 SHOW_SONAME(64) 987 SHOW_SONAME(64)
716 } 988 }
717 989
718 return NULL; 990 return NULL;
719} 991}
992
993/*
994 * We support the symbol form:
995 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
996 * If the symbol name is empty, then all symbols are matched.
997 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
998 * Do not rely on this output format at all.
999 * Otherwise the symbol name is used to search (either regex or string compare).
1000 * If the first char of the symbol name is a plus ("+"), then only match
1001 * defined symbols. If it's a minus ("-"), only match undefined symbols.
1002 * Putting modifiers in between the percent signs allows for more in depth
1003 * filters. There are groups of modifiers. If you don't specify a member
1004 * of a group, then all types in that group are matched. The current
1005 * groups and their types are:
1006 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
1007 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1008 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1009 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1010 * You can search for multiple symbols at once by seperating with a comma (",").
1011 *
1012 * Some examples:
1013 * ELFs with a weak function "foo":
1014 * scanelf -s %wf%foo <ELFs>
1015 * ELFs that define the symbol "main":
1016 * scanelf -s +main <ELFs>
1017 * scanelf -s %d%main <ELFs>
1018 * ELFs that refer to the undefined symbol "brk":
1019 * scanelf -s -brk <ELFs>
1020 * scanelf -s %u%brk <ELFs>
1021 * All global defined objects in an ELF:
1022 * scanelf -s %ogd% <ELF>
1023 */
1024static void
1025scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1026 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1027{
1028 char *this_sym, *next_sym, saved = saved;
1029
1030 /* allow the user to specify a comma delimited list of symbols to search for */
1031 next_sym = NULL;
1032 do {
1033 bool inc_notype, inc_object, inc_func, inc_file,
1034 inc_local, inc_global, inc_weak,
1035 inc_def, inc_undef, inc_abs, inc_common;
1036
1037 if (next_sym) {
1038 next_sym[-1] = saved;
1039 this_sym = next_sym;
1040 } else
1041 this_sym = find_sym;
1042 if ((next_sym = strchr(this_sym, ','))) {
1043 /* make parsing easier by killing the comma temporarily */
1044 saved = *next_sym;
1045 *next_sym = '\0';
1046 next_sym += 1;
1047 }
1048
1049 /* symbol selection! */
1050 inc_notype = inc_object = inc_func = inc_file = \
1051 inc_local = inc_global = inc_weak = \
1052 inc_def = inc_undef = inc_abs = inc_common = \
1053 (*this_sym != '%');
1054
1055 /* parse the contents of %...% */
1056 if (!inc_notype) {
1057 while (*(this_sym++)) {
1058 if (*this_sym == '%') {
1059 ++this_sym;
1060 break;
1061 }
1062 switch (*this_sym) {
1063 case 'n': inc_notype = true; break;
1064 case 'o': inc_object = true; break;
1065 case 'f': inc_func = true; break;
1066 case 'F': inc_file = true; break;
1067 case 'l': inc_local = true; break;
1068 case 'g': inc_global = true; break;
1069 case 'w': inc_weak = true; break;
1070 case 'd': inc_def = true; break;
1071 case 'u': inc_undef = true; break;
1072 case 'a': inc_abs = true; break;
1073 case 'c': inc_common = true; break;
1074 default: err("invalid symbol selector '%c'", *this_sym);
1075 }
1076 }
1077
1078 /* If no types are matched, not match all */
1079 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1080 inc_notype = inc_object = inc_func = inc_file = true;
1081 if (!inc_local && !inc_global && !inc_weak)
1082 inc_local = inc_global = inc_weak = true;
1083 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1084 inc_def = inc_undef = inc_abs = inc_common = true;
1085
1086 /* backwards compat for defined/undefined short hand */
1087 } else if (*this_sym == '+') {
1088 inc_undef = false;
1089 ++this_sym;
1090 } else if (*this_sym == '-') {
1091 inc_def = inc_abs = inc_common = false;
1092 ++this_sym;
1093 }
1094
1095 /* filter symbols */
1096 if ((!inc_notype && stt == STT_NOTYPE) || \
1097 (!inc_object && stt == STT_OBJECT) || \
1098 (!inc_func && stt == STT_FUNC ) || \
1099 (!inc_file && stt == STT_FILE ) || \
1100 (!inc_local && stb == STB_LOCAL ) || \
1101 (!inc_global && stb == STB_GLOBAL) || \
1102 (!inc_weak && stb == STB_WEAK ) || \
1103 (!inc_def && shn && shn < SHN_LORESERVE) || \
1104 (!inc_undef && shn == SHN_UNDEF ) || \
1105 (!inc_abs && shn == SHN_ABS ) || \
1106 (!inc_common && shn == SHN_COMMON))
1107 continue;
1108
1109 if (*this_sym == '*') {
1110 /* a "*" symbol gets you debug output */
1111 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1112 ((*found_sym == 0) ? "\n\t" : "\t"),
1113 elf->base_filename,
1114 size,
1115 get_elfstttype(stt),
1116 get_elfstbtype(stb),
1117 get_elfshntype(shn),
1118 symname);
1119 goto matched;
1120
1121 } else {
1122 if (g_match) {
1123 /* regex match the symbol */
1124 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1125 continue;
1126
1127 } else if (*this_sym) {
1128 /* give empty symbols a "pass", else do a normal compare */
1129 const size_t len = strlen(this_sym);
1130 if (!(strncmp(this_sym, symname, len) == 0 &&
1131 /* Accept unversioned symbol names */
1132 (symname[len] == '\0' || symname[len] == '@')))
1133 continue;
1134 }
1135
1136 if (be_semi_verbose) {
1137 char buf[1024];
1138 snprintf(buf, sizeof(buf), "%lX %s %s",
1139 size,
1140 get_elfstttype(stt),
1141 this_sym);
1142 *ret = xstrdup(buf);
1143 } else {
1144 if (*ret) xchrcat(ret, ',', ret_len);
1145 xstrcat(ret, symname, ret_len);
1146 }
1147
1148 goto matched;
1149 }
1150 } while (next_sym);
1151
1152 return;
1153
1154 matched:
1155 *found_sym = 1;
1156 if (next_sym)
1157 next_sym[-1] = saved;
1158}
1159
720static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1160static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
721{ 1161{
722 unsigned long i; 1162 unsigned long i;
723 char *ret; 1163 char *ret;
724 void *symtab_void, *strtab_void; 1164 void *symtab_void, *strtab_void;
725 1165
726 if (!find_sym) return NULL; 1166 if (!find_sym) return NULL;
727 ret = find_sym; 1167 ret = NULL;
728 1168
729 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1169 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
730 1170
731 if (symtab_void && strtab_void) { 1171 if (symtab_void && strtab_void) {
732#define FIND_SYM(B) \ 1172#define FIND_SYM(B) \
733 if (elf->elf_class == ELFCLASS ## B) { \ 1173 if (elf->elf_class == ELFCLASS ## B) { \
734 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1174 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
735 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1175 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
736 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1176 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
737 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1177 unsigned long cnt = EGET(symtab->sh_entsize); \
738 char *symname; \ 1178 char *symname; \
1179 size_t ret_len = 0; \
1180 if (cnt) \
1181 cnt = EGET(symtab->sh_size) / cnt; \
739 for (i = 0; i < cnt; ++i) { \ 1182 for (i = 0; i < cnt; ++i) { \
1183 if ((void*)sym > elf->data_end) { \
1184 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1185 goto break_out; \
1186 } \
740 if (sym->st_name) { \ 1187 if (sym->st_name) { \
1188 /* make sure the symbol name is in acceptable memory range */ \
741 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1189 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
742 if (*find_sym == '*') { \ 1190 if ((void*)symname > elf->data_end) { \
743 printf("%s(%s) %5lX %15s %s\n", \ 1191 warnf("%s: corrupt ELF symbols", elf->filename); \
744 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1192 ++sym; \
745 elf->base_filename, \ 1193 continue; \
746 (unsigned long)sym->st_size, \
747 get_elfstttype(sym->st_info), \
748 symname); \
749 *found_sym = 1; \
750 } else { \
751 char *this_sym, *next_sym; \
752 this_sym = find_sym; \
753 do { \
754 next_sym = strchr(this_sym, ','); \
755 if (next_sym == NULL) \
756 next_sym = this_sym + strlen(this_sym); \
757 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
758 (strcmp(symname, versioned_symname) == 0)) { \
759 ret = this_sym; \
760 (*found_sym)++; \
761 goto break_out; \
762 } \
763 this_sym = next_sym + 1; \
764 } while (*next_sym != '\0'); \
765 } \ 1194 } \
1195 scanelf_match_symname(elf, found_sym, \
1196 &ret, &ret_len, symname, \
1197 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1198 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1199 EGET(sym->st_shndx), \
1200 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1201 EGET(sym->st_size)); \
766 } \ 1202 } \
767 ++sym; \ 1203 ++sym; \
768 } } 1204 } }
769 FIND_SYM(32) 1205 FIND_SYM(32)
770 FIND_SYM(64) 1206 FIND_SYM(64)
776 if (*find_sym != '*' && *found_sym) 1212 if (*find_sym != '*' && *found_sym)
777 return ret; 1213 return ret;
778 if (be_quiet) 1214 if (be_quiet)
779 return NULL; 1215 return NULL;
780 else 1216 else
781 return (char *)" - "; 1217 return " - ";
782} 1218}
1219
1220static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1221{
1222 if (!find_section)
1223 return NULL;
1224
1225#define FIND_SECTION(B) \
1226 if (elf->elf_class == ELFCLASS ## B) { \
1227 size_t matched, n; \
1228 int invert; \
1229 const char *section_name; \
1230 Elf ## B ## _Shdr *section; \
1231 \
1232 matched = 0; \
1233 array_for_each(find_section_arr, n, section_name) { \
1234 invert = (*section_name == '!' ? 1 : 0); \
1235 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1236 if ((section == NULL && invert) || (section != NULL && !invert)) \
1237 ++matched; \
1238 } \
1239 \
1240 if (matched == array_cnt(find_section_arr)) \
1241 *found_section = 1; \
1242 }
1243 FIND_SECTION(32)
1244 FIND_SECTION(64)
1245
1246 if (be_wewy_wewy_quiet)
1247 return NULL;
1248
1249 if (*found_section)
1250 return find_section;
1251
1252 if (be_quiet)
1253 return NULL;
1254 else
1255 return " - ";
1256}
1257
783/* scan an elf file and show all the fun stuff */ 1258/* scan an elf file and show all the fun stuff */
784#define prints(str) write(fileno(stdout), str, strlen(str)) 1259#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
785static void scanelf_file(const char *filename) 1260static int scanelf_elfobj(elfobj *elf)
786{ 1261{
787 unsigned long i; 1262 unsigned long i;
788 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1263 char found_pax, found_phdr, found_relro, found_load, found_textrel,
789 found_rpath, found_needed, found_interp, found_bind, found_soname, 1264 found_rpath, found_needed, found_interp, found_bind, found_soname,
790 found_sym, found_lib, found_file, found_textrels; 1265 found_sym, found_lib, found_file, found_textrels, found_section;
791 elfobj *elf;
792 struct stat st;
793 static char *out_buffer = NULL; 1266 static char *out_buffer = NULL;
794 static size_t out_len; 1267 static size_t out_len;
795 1268
796 /* make sure 'filename' exists */
797 if (lstat(filename, &st) == -1) {
798 if (be_verbose > 2) printf("%s: does not exist\n", filename);
799 return;
800 }
801 /* always handle regular files and handle symlinked files if no -y */
802 if (S_ISLNK(st.st_mode)) {
803 if (!scan_symlink) return;
804 stat(filename, &st);
805 }
806 if (!S_ISREG(st.st_mode)) {
807 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
808 return;
809 }
810
811 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1269 found_pax = found_phdr = found_relro = found_load = found_textrel = \
812 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1270 found_rpath = found_needed = found_interp = found_bind = found_soname = \
813 found_sym = found_lib = found_file = found_textrels = 0; 1271 found_sym = found_lib = found_file = found_textrels = found_section = 0;
814 1272
815 /* verify this is real ELF */
816 if ((elf = readelf(filename)) == NULL) {
817 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
818 return;
819 }
820
821 if (be_verbose > 1) 1273 if (be_verbose > 2)
822 printf("%s: scanning file {%s,%s}\n", filename, 1274 printf("%s: scanning file {%s,%s}\n", elf->filename,
823 get_elfeitype(EI_CLASS, elf->elf_class), 1275 get_elfeitype(EI_CLASS, elf->elf_class),
824 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1276 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
825 else if (be_verbose) 1277 else if (be_verbose > 1)
826 printf("%s: scanning file\n", filename); 1278 printf("%s: scanning file\n", elf->filename);
827 1279
828 /* init output buffer */ 1280 /* init output buffer */
829 if (!out_buffer) { 1281 if (!out_buffer) {
830 out_len = sizeof(char) * 80; 1282 out_len = sizeof(char) * 80;
831 out_buffer = (char*)xmalloc(out_len); 1283 out_buffer = xmalloc(out_len);
832 } 1284 }
833 *out_buffer = '\0'; 1285 *out_buffer = '\0';
834 1286
835 /* show the header */ 1287 /* show the header */
836 if (!be_quiet && show_banner) { 1288 if (!be_quiet && show_banner) {
837 for (i = 0; out_format[i]; ++i) { 1289 for (i = 0; out_format[i]; ++i) {
838 if (!IS_MODIFIER(out_format[i])) continue; 1290 if (!IS_MODIFIER(out_format[i])) continue;
839 1291
840 switch (out_format[++i]) { 1292 switch (out_format[++i]) {
1293 case '+': break;
841 case '%': break; 1294 case '%': break;
842 case '#': break; 1295 case '#': break;
843 case 'F': 1296 case 'F':
844 case 'p': 1297 case 'p':
845 case 'f': prints("FILE "); found_file = 1; break; 1298 case 'f': prints("FILE "); found_file = 1; break;
846 case 'o': prints(" TYPE "); break; 1299 case 'o': prints(" TYPE "); break;
847 case 'x': prints(" PAX "); break; 1300 case 'x': prints(" PAX "); break;
848 case 'e': prints("STK/REL/PTL "); break; 1301 case 'e': prints("STK/REL/PTL "); break;
849 case 't': prints("TEXTREL "); break; 1302 case 't': prints("TEXTREL "); break;
850 case 'r': prints("RPATH "); break; 1303 case 'r': prints("RPATH "); break;
1304 case 'M': prints("CLASS "); break;
851 case 'n': prints("NEEDED "); break; 1305 case 'n': prints("NEEDED "); break;
852 case 'i': prints("INTERP "); break; 1306 case 'i': prints("INTERP "); break;
853 case 'b': prints("BIND "); break; 1307 case 'b': prints("BIND "); break;
1308 case 'Z': prints("SIZE "); break;
854 case 'S': prints("SONAME "); break; 1309 case 'S': prints("SONAME "); break;
855 case 's': prints("SYM "); break; 1310 case 's': prints("SYM "); break;
856 case 'N': prints("LIB "); break; 1311 case 'N': prints("LIB "); break;
857 case 'T': prints("TEXTRELS "); break; 1312 case 'T': prints("TEXTRELS "); break;
1313 case 'k': prints("SECTION "); break;
1314 case 'a': prints("ARCH "); break;
1315 case 'I': prints("OSABI "); break;
1316 case 'Y': prints("EABI "); break;
1317 case 'O': prints("PERM "); break;
1318 case 'D': prints("ENDIAN "); break;
858 default: warnf("'%c' has no title ?", out_format[i]); 1319 default: warnf("'%c' has no title ?", out_format[i]);
859 } 1320 }
860 } 1321 }
861 if (!found_file) prints("FILE "); 1322 if (!found_file) prints("FILE ");
862 prints("\n"); 1323 prints("\n");
866 1327
867 /* dump all the good stuff */ 1328 /* dump all the good stuff */
868 for (i = 0; out_format[i]; ++i) { 1329 for (i = 0; out_format[i]; ++i) {
869 const char *out; 1330 const char *out;
870 const char *tmp; 1331 const char *tmp;
871 1332 static char ubuf[sizeof(unsigned long)*2];
872 /* make sure we trim leading spaces in quiet mode */
873 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
874 *out_buffer = '\0';
875
876 if (!IS_MODIFIER(out_format[i])) { 1333 if (!IS_MODIFIER(out_format[i])) {
877 xchrcat(&out_buffer, out_format[i], &out_len); 1334 xchrcat(&out_buffer, out_format[i], &out_len);
878 continue; 1335 continue;
879 } 1336 }
880 1337
881 out = NULL; 1338 out = NULL;
882 be_wewy_wewy_quiet = (out_format[i] == '#'); 1339 be_wewy_wewy_quiet = (out_format[i] == '#');
1340 be_semi_verbose = (out_format[i] == '+');
883 switch (out_format[++i]) { 1341 switch (out_format[++i]) {
1342 case '+':
884 case '%': 1343 case '%':
885 case '#': 1344 case '#':
886 xchrcat(&out_buffer, out_format[i], &out_len); break; 1345 xchrcat(&out_buffer, out_format[i], &out_len); break;
887 case 'F': 1346 case 'F':
888 found_file = 1; 1347 found_file = 1;
889 if (be_wewy_wewy_quiet) break; 1348 if (be_wewy_wewy_quiet) break;
890 xstrcat(&out_buffer, filename, &out_len); 1349 xstrcat(&out_buffer, elf->filename, &out_len);
891 break; 1350 break;
892 case 'p': 1351 case 'p':
893 found_file = 1; 1352 found_file = 1;
894 if (be_wewy_wewy_quiet) break; 1353 if (be_wewy_wewy_quiet) break;
895 tmp = filename; 1354 tmp = elf->filename;
896 if (search_path) { 1355 if (search_path) {
897 ssize_t len_search = strlen(search_path); 1356 ssize_t len_search = strlen(search_path);
898 ssize_t len_file = strlen(filename); 1357 ssize_t len_file = strlen(elf->filename);
899 if (!strncmp(filename, search_path, len_search) && \ 1358 if (!strncmp(elf->filename, search_path, len_search) && \
900 len_file > len_search) 1359 len_file > len_search)
901 tmp += len_search; 1360 tmp += len_search;
902 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1361 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
903 } 1362 }
904 xstrcat(&out_buffer, tmp, &out_len); 1363 xstrcat(&out_buffer, tmp, &out_len);
905 break; 1364 break;
906 case 'f': 1365 case 'f':
907 found_file = 1; 1366 found_file = 1;
908 if (be_wewy_wewy_quiet) break; 1367 if (be_wewy_wewy_quiet) break;
909 tmp = strrchr(filename, '/'); 1368 tmp = strrchr(elf->filename, '/');
910 tmp = (tmp == NULL ? filename : tmp+1); 1369 tmp = (tmp == NULL ? elf->filename : tmp+1);
911 xstrcat(&out_buffer, tmp, &out_len); 1370 xstrcat(&out_buffer, tmp, &out_len);
912 break; 1371 break;
913 case 'o': out = get_elfetype(elf); break; 1372 case 'o': out = get_elfetype(elf); break;
914 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1373 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
915 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1374 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
916 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1375 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
917 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1376 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
918 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1377 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1378 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1379 case 'D': out = get_endian(elf); break;
1380 case 'O': out = strfileperms(elf->filename); break;
919 case 'n': 1381 case 'n':
920 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1382 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
921 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1383 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
922 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1384 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
923 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1385 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
924 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1386 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1387 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1388 case 'a': out = get_elfemtype(elf); break;
1389 case 'I': out = get_elfosabi(elf); break;
1390 case 'Y': out = get_elf_eabi(elf); break;
1391 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
925 default: warnf("'%c' has no scan code?", out_format[i]); 1392 default: warnf("'%c' has no scan code?", out_format[i]);
926 } 1393 }
927 if (out) { 1394 if (out)
928 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
929 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
930 xstrncat(&out_buffer, out, &out_len, (tmp-out));
931 else
932 xstrcat(&out_buffer, out, &out_len); 1395 xstrcat(&out_buffer, out, &out_len);
933 }
934 } 1396 }
935 1397
936#define FOUND_SOMETHING() \ 1398#define FOUND_SOMETHING() \
937 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1399 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
938 found_rpath || found_needed || found_interp || found_bind || \ 1400 found_rpath || found_needed || found_interp || found_bind || \
939 found_soname || found_sym || found_lib || found_textrels) 1401 found_soname || found_sym || found_lib || found_textrels || found_section )
940 1402
941 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1403 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
942 xchrcat(&out_buffer, ' ', &out_len); 1404 xchrcat(&out_buffer, ' ', &out_len);
943 xstrcat(&out_buffer, filename, &out_len); 1405 xstrcat(&out_buffer, elf->filename, &out_len);
944 } 1406 }
945 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1407 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
946 puts(out_buffer); 1408 puts(out_buffer);
947 fflush(stdout); 1409 fflush(stdout);
948 } 1410 }
949 1411
1412 return 0;
1413}
1414
1415/* scan a single elf */
1416static int scanelf_elf(const char *filename, int fd, size_t len)
1417{
1418 int ret = 1;
1419 elfobj *elf;
1420
1421 /* verify this is real ELF */
1422 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1423 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1424 return ret;
1425 }
1426 switch (match_bits) {
1427 case 32:
1428 if (elf->elf_class != ELFCLASS32)
1429 goto label_done;
1430 break;
1431 case 64:
1432 if (elf->elf_class != ELFCLASS64)
1433 goto label_done;
1434 break;
1435 default: break;
1436 }
1437 if (match_etypes) {
1438 char sbuf[126];
1439 strncpy(sbuf, match_etypes, sizeof(sbuf));
1440 if (strchr(match_etypes, ',') != NULL) {
1441 char *p;
1442 while ((p = strrchr(sbuf, ',')) != NULL) {
1443 *p = 0;
1444 if (etype_lookup(p+1) == get_etype(elf))
1445 goto label_ret;
1446 }
1447 }
1448 if (etype_lookup(sbuf) != get_etype(elf))
1449 goto label_done;
1450 }
1451
1452label_ret:
1453 ret = scanelf_elfobj(elf);
1454
1455label_done:
950 unreadelf(elf); 1456 unreadelf(elf);
1457 return ret;
1458}
1459
1460/* scan an archive of elfs */
1461static int scanelf_archive(const char *filename, int fd, size_t len)
1462{
1463 archive_handle *ar;
1464 archive_member *m;
1465 char *ar_buffer;
1466 elfobj *elf;
1467
1468 ar = ar_open_fd(filename, fd);
1469 if (ar == NULL)
1470 return 1;
1471
1472 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1473 while ((m = ar_next(ar)) != NULL) {
1474 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1475 if (cur_pos == -1)
1476 errp("lseek() failed");
1477 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1478 if (elf) {
1479 scanelf_elfobj(elf);
1480 unreadelf(elf);
1481 }
1482 }
1483 munmap(ar_buffer, len);
1484
1485 return 0;
1486}
1487/* scan a file which may be an elf or an archive or some other magical beast */
1488static int scanelf_file(const char *filename, const struct stat *st_cache)
1489{
1490 const struct stat *st = st_cache;
1491 struct stat symlink_st;
1492 int fd;
1493
1494 /* always handle regular files and handle symlinked files if no -y */
1495 if (S_ISLNK(st->st_mode)) {
1496 if (!scan_symlink) return 1;
1497 stat(filename, &symlink_st);
1498 st = &symlink_st;
1499 }
1500
1501 if (!S_ISREG(st->st_mode)) {
1502 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1503 return 1;
1504 }
1505
1506 if (match_perms) {
1507 if ((st->st_mode | match_perms) != st->st_mode)
1508 return 1;
1509 }
1510 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1511 return 1;
1512
1513 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1514 /* if it isn't an ELF, maybe it's an .a archive */
1515 scanelf_archive(filename, fd, st->st_size);
1516
1517 close(fd);
1518 return 0;
1519}
1520
1521static const char *maybe_add_root(const char *fname, char *buf)
1522{
1523 if (root && strncmp(fname, root, strlen(root))) {
1524 strcpy(buf, root);
1525 strncat(buf, fname, __PAX_UTILS_PATH_MAX - strlen(root) - 1);
1526 fname = buf;
1527 }
1528 return fname;
951} 1529}
952 1530
953/* scan a directory for ET_EXEC files and print when we find one */ 1531/* scan a directory for ET_EXEC files and print when we find one */
954static void scanelf_dir(const char *path) 1532static int scanelf_dir(const char *path)
955{ 1533{
956 register DIR *dir; 1534 register DIR *dir;
957 register struct dirent *dentry; 1535 register struct dirent *dentry;
958 struct stat st_top, st; 1536 struct stat st_top, st;
959 char buf[_POSIX_PATH_MAX]; 1537 char buf[__PAX_UTILS_PATH_MAX];
1538 char _path[__PAX_UTILS_PATH_MAX];
960 size_t pathlen = 0, len = 0; 1539 size_t pathlen = 0, len = 0;
1540 int ret = 0;
1541
1542 path = maybe_add_root(path, _path);
961 1543
962 /* make sure path exists */ 1544 /* make sure path exists */
963 if (lstat(path, &st_top) == -1) { 1545 if (lstat(path, &st_top) == -1) {
964 if (be_verbose > 2) printf("%s: does not exist\n", path); 1546 if (be_verbose > 2) printf("%s: does not exist\n", path);
965 return; 1547 return 1;
966 } 1548 }
967 1549
968 /* ok, if it isn't a directory, assume we can open it */ 1550 /* ok, if it isn't a directory, assume we can open it */
969 if (!S_ISDIR(st_top.st_mode)) { 1551 if (!S_ISDIR(st_top.st_mode)) {
970 scanelf_file(path); 1552 return scanelf_file(path, &st_top);
971 return;
972 } 1553 }
973 1554
974 /* now scan the dir looking for fun stuff */ 1555 /* now scan the dir looking for fun stuff */
975 if ((dir = opendir(path)) == NULL) { 1556 if ((dir = opendir(path)) == NULL) {
976 warnf("could not opendir %s: %s", path, strerror(errno)); 1557 warnf("could not opendir %s: %s", path, strerror(errno));
977 return; 1558 return 1;
978 } 1559 }
979 if (be_verbose) printf("%s: scanning dir\n", path); 1560 if (be_verbose > 1) printf("%s: scanning dir\n", path);
980 1561
981 pathlen = strlen(path); 1562 pathlen = strlen(path);
982 while ((dentry = readdir(dir))) { 1563 while ((dentry = readdir(dir))) {
983 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1564 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
984 continue; 1565 continue;
986 if (len >= sizeof(buf)) { 1567 if (len >= sizeof(buf)) {
987 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1568 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
988 (unsigned long)len, (unsigned long)sizeof(buf)); 1569 (unsigned long)len, (unsigned long)sizeof(buf));
989 continue; 1570 continue;
990 } 1571 }
991 sprintf(buf, "%s/%s", path, dentry->d_name); 1572 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
992 if (lstat(buf, &st) != -1) { 1573 if (lstat(buf, &st) != -1) {
993 if (S_ISREG(st.st_mode)) 1574 if (S_ISREG(st.st_mode))
994 scanelf_file(buf); 1575 ret = scanelf_file(buf, &st);
995 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1576 else if (dir_recurse && S_ISDIR(st.st_mode)) {
996 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1577 if (dir_crossmount || (st_top.st_dev == st.st_dev))
997 scanelf_dir(buf); 1578 ret = scanelf_dir(buf);
998 } 1579 }
999 } 1580 }
1000 } 1581 }
1001 closedir(dir); 1582 closedir(dir);
1583 return ret;
1002} 1584}
1003 1585
1004static int scanelf_from_file(char *filename) 1586static int scanelf_from_file(const char *filename)
1005{ 1587{
1006 FILE *fp = NULL; 1588 FILE *fp = NULL;
1007 char *p; 1589 char *p;
1008 char path[_POSIX_PATH_MAX]; 1590 char path[__PAX_UTILS_PATH_MAX];
1591 int ret = 0;
1009 1592
1010 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1593 if (strcmp(filename, "-") == 0)
1011 fp = stdin; 1594 fp = stdin;
1012 else if ((fp = fopen(filename, "r")) == NULL) 1595 else if ((fp = fopen(filename, "r")) == NULL)
1013 return 1; 1596 return 1;
1014 1597
1015 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1598 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1016 if ((p = strchr(path, '\n')) != NULL) 1599 if ((p = strchr(path, '\n')) != NULL)
1017 *p = 0; 1600 *p = 0;
1018 search_path = path; 1601 search_path = path;
1019 scanelf_dir(path); 1602 ret = scanelf_dir(path);
1020 } 1603 }
1021 if (fp != stdin) 1604 if (fp != stdin)
1022 fclose(fp); 1605 fclose(fp);
1023 return 0; 1606 return ret;
1024} 1607}
1025 1608
1026static void load_ld_so_conf() 1609#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1610
1611static int load_ld_cache_config(int i, const char *fname)
1027{ 1612{
1028 FILE *fp = NULL; 1613 FILE *fp = NULL;
1029 char *p; 1614 char *p;
1030 char path[_POSIX_PATH_MAX]; 1615 char path[__PAX_UTILS_PATH_MAX];
1031 int i = 0; 1616 char _fname[__PAX_UTILS_PATH_MAX];
1032 1617
1618 fname = maybe_add_root(fname, _fname);
1619
1033 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1620 if ((fp = fopen(fname, "r")) == NULL)
1034 return; 1621 return i;
1035 1622
1036 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1623 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1037 if (*path != '/')
1038 continue;
1039
1040 if ((p = strrchr(path, '\r')) != NULL) 1624 if ((p = strrchr(path, '\r')) != NULL)
1041 *p = 0; 1625 *p = 0;
1042 if ((p = strchr(path, '\n')) != NULL) 1626 if ((p = strchr(path, '\n')) != NULL)
1043 *p = 0; 1627 *p = 0;
1044 1628
1045 ldpaths[i++] = xstrdup(path); 1629 /* recursive includes of the same file will make this segfault. */
1630 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1631 glob_t gl;
1632 size_t x;
1633 char gpath[__PAX_UTILS_PATH_MAX];
1046 1634
1047 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1635 memset(gpath, 0, sizeof(gpath));
1048 break; 1636 if (root)
1637 strcpy(gpath, root);
1638
1639 if (path[8] != '/')
1640 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1641 else
1642 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1643
1644 if (glob(gpath, 0, NULL, &gl) == 0) {
1645 for (x = 0; x < gl.gl_pathc; ++x) {
1646 /* try to avoid direct loops */
1647 if (strcmp(gl.gl_pathv[x], fname) == 0)
1648 continue;
1649 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1650 }
1651 globfree(&gl);
1652 continue;
1653 }
1049 } 1654 }
1050 ldpaths[i] = NULL; 1655
1656 if (*path != '/')
1657 continue;
1658
1659 xarraypush(ldpaths, path, strlen(path));
1660 }
1051 1661
1052 fclose(fp); 1662 fclose(fp);
1663 return i;
1053} 1664}
1665
1666#elif defined(__FreeBSD__) || defined(__DragonFly__)
1667
1668static int load_ld_cache_config(int i, const char *fname)
1669{
1670 FILE *fp = NULL;
1671 char *b = NULL, *p;
1672 struct elfhints_hdr hdr;
1673 char _fname[__PAX_UTILS_PATH_MAX];
1674
1675 fname = maybe_add_root(fname, _fname);
1676
1677 if ((fp = fopen(fname, "r")) == NULL)
1678 return i;
1679
1680 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1681 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1682 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1683 {
1684 fclose(fp);
1685 return i;
1686 }
1687
1688 b = xmalloc(hdr.dirlistlen + 1);
1689 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1690 fclose(fp);
1691 free(b);
1692 return i;
1693 }
1694
1695 while ((p = strsep(&b, ":"))) {
1696 if (*p == '\0')
1697 continue;
1698 xarraypush(ldpaths, p, strlen(p));
1699 }
1700
1701 free(b);
1702 fclose(fp);
1703 return i;
1704}
1705
1706#else
1707#ifdef __ELF__
1708#warning Cache config support not implemented for your target
1709#endif
1710static int load_ld_cache_config(int i, const char *fname)
1711{
1712 return 0;
1713}
1714#endif
1054 1715
1055/* scan /etc/ld.so.conf for paths */ 1716/* scan /etc/ld.so.conf for paths */
1056static void scanelf_ldpath() 1717static void scanelf_ldpath(void)
1057{ 1718{
1058 char scan_l, scan_ul, scan_ull; 1719 char scan_l, scan_ul, scan_ull;
1720 size_t n;
1721 const char *ldpath;
1059 int i = 0; 1722 int i = 0;
1060 1723
1061 if (!ldpaths[0]) 1724 if (array_cnt(ldpaths) == 0)
1062 err("Unable to load any paths from ld.so.conf"); 1725 err("Unable to load any paths from ld.so.conf");
1063 1726
1064 scan_l = scan_ul = scan_ull = 0; 1727 scan_l = scan_ul = scan_ull = 0;
1065 1728
1066 while (ldpaths[i]) { 1729 array_for_each(ldpaths, n, ldpath) {
1067 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1730 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
1068 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1731 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
1069 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1732 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
1070 scanelf_dir(ldpaths[i]); 1733 scanelf_dir(ldpath);
1071 ++i; 1734 ++i;
1072 } 1735 }
1073 1736
1074 if (!scan_l) scanelf_dir("/lib"); 1737 if (!scan_l) scanelf_dir("/lib");
1075 if (!scan_ul) scanelf_dir("/usr/lib"); 1738 if (!scan_ul) scanelf_dir("/usr/lib");
1076 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1739 if (!scan_ull) scanelf_dir("/usr/local/lib");
1077} 1740}
1078 1741
1079/* scan env PATH for paths */ 1742/* scan env PATH for paths */
1080static void scanelf_envpath() 1743static void scanelf_envpath(void)
1081{ 1744{
1082 char *path, *p; 1745 char *path, *p;
1083 1746
1084 path = getenv("PATH"); 1747 path = getenv("PATH");
1085 if (!path) 1748 if (!path)
1092 } 1755 }
1093 1756
1094 free(path); 1757 free(path);
1095} 1758}
1096 1759
1097 1760/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1098/* usage / invocation handling functions */
1099#define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV" 1761#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1100#define a_argument required_argument 1762#define a_argument required_argument
1101static struct option const long_opts[] = { 1763static struct option const long_opts[] = {
1102 {"path", no_argument, NULL, 'p'}, 1764 {"path", no_argument, NULL, 'p'},
1103 {"ldpath", no_argument, NULL, 'l'}, 1765 {"ldpath", no_argument, NULL, 'l'},
1766 {"root", a_argument, NULL, 128},
1104 {"recursive", no_argument, NULL, 'R'}, 1767 {"recursive", no_argument, NULL, 'R'},
1105 {"mount", no_argument, NULL, 'm'}, 1768 {"mount", no_argument, NULL, 'm'},
1106 {"symlink", no_argument, NULL, 'y'}, 1769 {"symlink", no_argument, NULL, 'y'},
1770 {"archives", no_argument, NULL, 'A'},
1771 {"ldcache", no_argument, NULL, 'L'},
1772 {"fix", no_argument, NULL, 'X'},
1773 {"setpax", a_argument, NULL, 'z'},
1107 {"pax", no_argument, NULL, 'x'}, 1774 {"pax", no_argument, NULL, 'x'},
1108 {"header", no_argument, NULL, 'e'}, 1775 {"header", no_argument, NULL, 'e'},
1109 {"textrel", no_argument, NULL, 't'}, 1776 {"textrel", no_argument, NULL, 't'},
1110 {"rpath", no_argument, NULL, 'r'}, 1777 {"rpath", no_argument, NULL, 'r'},
1111 {"needed", no_argument, NULL, 'n'}, 1778 {"needed", no_argument, NULL, 'n'},
1112 {"ldcache", no_argument, NULL, 'L'},
1113 {"interp", no_argument, NULL, 'i'}, 1779 {"interp", no_argument, NULL, 'i'},
1114 {"bind", no_argument, NULL, 'b'}, 1780 {"bind", no_argument, NULL, 'b'},
1115 {"soname", no_argument, NULL, 'S'}, 1781 {"soname", no_argument, NULL, 'S'},
1116 {"symbol", a_argument, NULL, 's'}, 1782 {"symbol", a_argument, NULL, 's'},
1783 {"section", a_argument, NULL, 'k'},
1117 {"lib", a_argument, NULL, 'N'}, 1784 {"lib", a_argument, NULL, 'N'},
1118 {"gmatch", no_argument, NULL, 'g'}, 1785 {"gmatch", no_argument, NULL, 'g'},
1119 {"textrels", no_argument, NULL, 'T'}, 1786 {"textrels", no_argument, NULL, 'T'},
1787 {"etype", a_argument, NULL, 'E'},
1788 {"bits", a_argument, NULL, 'M'},
1789 {"endian", no_argument, NULL, 'D'},
1790 {"osabi", no_argument, NULL, 'I'},
1791 {"eabi", no_argument, NULL, 'Y'},
1792 {"perms", a_argument, NULL, 'O'},
1793 {"size", no_argument, NULL, 'Z'},
1120 {"all", no_argument, NULL, 'a'}, 1794 {"all", no_argument, NULL, 'a'},
1121 {"quiet", no_argument, NULL, 'q'}, 1795 {"quiet", no_argument, NULL, 'q'},
1122 {"verbose", no_argument, NULL, 'v'}, 1796 {"verbose", no_argument, NULL, 'v'},
1123 {"format", a_argument, NULL, 'F'}, 1797 {"format", a_argument, NULL, 'F'},
1124 {"from", a_argument, NULL, 'f'}, 1798 {"from", a_argument, NULL, 'f'},
1125 {"file", a_argument, NULL, 'o'}, 1799 {"file", a_argument, NULL, 'o'},
1800 {"nocolor", no_argument, NULL, 'C'},
1126 {"nobanner", no_argument, NULL, 'B'}, 1801 {"nobanner", no_argument, NULL, 'B'},
1127 {"help", no_argument, NULL, 'h'}, 1802 {"help", no_argument, NULL, 'h'},
1128 {"version", no_argument, NULL, 'V'}, 1803 {"version", no_argument, NULL, 'V'},
1129 {NULL, no_argument, NULL, 0x0} 1804 {NULL, no_argument, NULL, 0x0}
1130}; 1805};
1131 1806
1132static const char *opts_help[] = { 1807static const char * const opts_help[] = {
1133 "Scan all directories in PATH environment", 1808 "Scan all directories in PATH environment",
1134 "Scan all directories in /etc/ld.so.conf", 1809 "Scan all directories in /etc/ld.so.conf",
1810 "Root directory (use with -l or -p)",
1135 "Scan directories recursively", 1811 "Scan directories recursively",
1136 "Don't recursively cross mount points", 1812 "Don't recursively cross mount points",
1137 "Don't scan symlinks\n", 1813 "Don't scan symlinks",
1814 "Scan archives (.a files)",
1815 "Utilize ld.so.cache information (use with -r/-n)",
1816 "Try and 'fix' bad things (use with -r/-e)",
1817 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1138 "Print PaX markings", 1818 "Print PaX markings",
1139 "Print GNU_STACK/PT_LOAD markings", 1819 "Print GNU_STACK/PT_LOAD markings",
1140 "Print TEXTREL information", 1820 "Print TEXTREL information",
1141 "Print RPATH information", 1821 "Print RPATH information",
1142 "Print NEEDED information", 1822 "Print NEEDED information",
1143 "Resolve NEEDED information (use with -n)",
1144 "Print INTERP information", 1823 "Print INTERP information",
1145 "Print BIND information", 1824 "Print BIND information",
1146 "Print SONAME information", 1825 "Print SONAME information",
1147 "Find a specified symbol", 1826 "Find a specified symbol",
1827 "Find a specified section",
1148 "Find a specified library", 1828 "Find a specified library",
1149 "Use strncmp to match libraries. (use with -N)", 1829 "Use regex matching rather than string compare (use with -s)",
1150 "Locate cause of TEXTREL", 1830 "Locate cause of TEXTREL",
1151 "Print all scanned info (-x -e -t -r -b)\n", 1831 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1832 "Print only ELF files matching numeric bits",
1833 "Print Endianness",
1834 "Print OSABI",
1835 "Print EABI (EM_ARM Only)",
1836 "Print only ELF files matching octal permissions",
1837 "Print ELF file size",
1838 "Print all useful/simple info\n",
1152 "Only output 'bad' things", 1839 "Only output 'bad' things",
1153 "Be verbose (can be specified more than once)", 1840 "Be verbose (can be specified more than once)",
1154 "Use specified format for output", 1841 "Use specified format for output",
1155 "Read input stream from a filename", 1842 "Read input stream from a filename",
1156 "Write output stream to a filename", 1843 "Write output stream to a filename",
1844 "Don't emit color in output",
1157 "Don't display the header", 1845 "Don't display the header",
1158 "Print this help and exit", 1846 "Print this help and exit",
1159 "Print version and exit", 1847 "Print version and exit",
1160 NULL 1848 NULL
1161}; 1849};
1163/* display usage and exit */ 1851/* display usage and exit */
1164static void usage(int status) 1852static void usage(int status)
1165{ 1853{
1166 unsigned long i; 1854 unsigned long i;
1167 printf("* Scan ELF binaries for stuff\n\n" 1855 printf("* Scan ELF binaries for stuff\n\n"
1168 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1856 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1169 printf("Options: -[%s]\n", PARSE_FLAGS); 1857 printf("Options: -[%s]\n", PARSE_FLAGS);
1170 for (i = 0; long_opts[i].name; ++i) 1858 for (i = 0; long_opts[i].name; ++i)
1171 if (long_opts[i].has_arg == no_argument) 1859 if (long_opts[i].has_arg == no_argument)
1172 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1860 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1861 long_opts[i].name, opts_help[i]);
1862 else if (long_opts[i].val > '~')
1863 printf(" --%-7s <arg> * %s\n",
1173 long_opts[i].name, opts_help[i]); 1864 long_opts[i].name, opts_help[i]);
1174 else 1865 else
1175 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1866 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1176 long_opts[i].name, opts_help[i]); 1867 long_opts[i].name, opts_help[i]);
1177 1868
1178 if (status != EXIT_SUCCESS) 1869 puts("\nFor more information, see the scanelf(1) manpage");
1179 exit(status);
1180
1181 puts("\nThe format modifiers for the -F option are:");
1182 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1183 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1184 puts(" i INTERP \tb BIND \ts symbol");
1185 puts(" N library \to Type \tT TEXTRELs");
1186 puts(" S SONAME");
1187 puts(" p filename (with search path removed)");
1188 puts(" f filename (short name/basename)");
1189 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1190
1191 exit(status); 1870 exit(status);
1192} 1871}
1193 1872
1194/* parse command line arguments and preform needed actions */ 1873/* parse command line arguments and preform needed actions */
1874#define do_pax_state(option, flag) \
1875 if (islower(option)) { \
1876 flags &= ~PF_##flag; \
1877 flags |= PF_NO##flag; \
1878 } else { \
1879 flags &= ~PF_NO##flag; \
1880 flags |= PF_##flag; \
1881 }
1195static void parseargs(int argc, char *argv[]) 1882static int parseargs(int argc, char *argv[])
1196{ 1883{
1197 int i; 1884 int i;
1198 char *from_file = NULL; 1885 const char *from_file = NULL;
1886 int ret = 0;
1199 1887
1200 opterr = 0; 1888 opterr = 0;
1201 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1889 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1202 switch (i) { 1890 switch (i) {
1203 1891
1207 VERSION, __FILE__, __DATE__, rcsid, argv0); 1895 VERSION, __FILE__, __DATE__, rcsid, argv0);
1208 exit(EXIT_SUCCESS); 1896 exit(EXIT_SUCCESS);
1209 break; 1897 break;
1210 case 'h': usage(EXIT_SUCCESS); break; 1898 case 'h': usage(EXIT_SUCCESS); break;
1211 case 'f': 1899 case 'f':
1212 if (from_file) err("Don't specify -f twice"); 1900 if (from_file) warn("You prob don't want to specify -f twice");
1213 from_file = xstrdup(optarg); 1901 from_file = optarg;
1902 break;
1903 case 'E':
1904 match_etypes = optarg;
1905 break;
1906 case 'M':
1907 match_bits = atoi(optarg);
1908 if (match_bits == 0) {
1909 if (strcmp(optarg, "ELFCLASS32") == 0)
1910 match_bits = 32;
1911 if (strcmp(optarg, "ELFCLASS64") == 0)
1912 match_bits = 64;
1913 }
1914 break;
1915 case 'O':
1916 if (sscanf(optarg, "%o", &match_perms) == -1)
1917 match_bits = 0;
1214 break; 1918 break;
1215 case 'o': { 1919 case 'o': {
1216 FILE *fp = NULL;
1217 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1920 if (freopen(optarg, "w", stdout) == NULL)
1218 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1921 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1219 SET_STDOUT(fp);
1220 break; 1922 break;
1221 } 1923 }
1222 1924 case 'k':
1925 xarraypush(find_section_arr, optarg, strlen(optarg));
1926 break;
1223 case 's': { 1927 case 's': {
1224 if (find_sym) warn("You prob don't want to specify -s twice"); 1928 if (find_sym) warn("You prob don't want to specify -s twice");
1225 find_sym = optarg; 1929 find_sym = optarg;
1226 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1227 sprintf(versioned_symname, "%s@", find_sym);
1228 break; 1930 break;
1229 } 1931 }
1230 case 'N': { 1932 case 'N':
1231 if (find_lib) warn("You prob don't want to specify -N twice"); 1933 xarraypush(find_lib_arr, optarg, strlen(optarg));
1232 find_lib = optarg;
1233 break; 1934 break;
1234 }
1235
1236 case 'F': { 1935 case 'F': {
1237 if (out_format) warn("You prob don't want to specify -F twice"); 1936 if (out_format) warn("You prob don't want to specify -F twice");
1238 out_format = optarg; 1937 out_format = optarg;
1239 break; 1938 break;
1240 } 1939 }
1940 case 'z': {
1941 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1942 size_t x;
1241 1943
1242 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 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;
1984 case 'g': g_match = 1; break;
1243 case 'L': printcache = 1; break; 1985 case 'L': use_ldcache = 1; break;
1244 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;
1245 case 'B': show_banner = 0; break; 1989 case 'B': show_banner = 0; break;
1246 case 'l': scan_ldpath = 1; break; 1990 case 'l': scan_ldpath = 1; break;
1247 case 'p': scan_envpath = 1; break; 1991 case 'p': scan_envpath = 1; break;
1248 case 'R': dir_recurse = 1; break; 1992 case 'R': dir_recurse = 1; break;
1249 case 'm': dir_crossmount = 0; break; 1993 case 'm': dir_crossmount = 0; break;
1994 case 'X': ++fix_elf; break;
1250 case 'x': show_pax = 1; break; 1995 case 'x': show_pax = 1; break;
1251 case 'e': show_phdr = 1; break; 1996 case 'e': show_phdr = 1; break;
1252 case 't': show_textrel = 1; break; 1997 case 't': show_textrel = 1; break;
1253 case 'r': show_rpath = 1; break; 1998 case 'r': show_rpath = 1; break;
1254 case 'n': show_needed = 1; break; 1999 case 'n': show_needed = 1; break;
1256 case 'b': show_bind = 1; break; 2001 case 'b': show_bind = 1; break;
1257 case 'S': show_soname = 1; break; 2002 case 'S': show_soname = 1; break;
1258 case 'T': show_textrels = 1; break; 2003 case 'T': show_textrels = 1; break;
1259 case 'q': be_quiet = 1; break; 2004 case 'q': be_quiet = 1; break;
1260 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2005 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1261 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;
1262 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;
1263 case ':': 2013 case ':':
1264 err("Option missing parameter\n"); 2014 err("Option '%c' is missing parameter", optopt);
1265 case '?': 2015 case '?':
1266 err("Unknown option\n"); 2016 err("Unknown option '%c' or argument missing", optopt);
1267 default: 2017 default:
1268 err("Unhandled option '%c'", i); 2018 err("Unhandled option '%c'; please report this", i);
1269 }
1270 } 2019 }
1271 2020 }
2021 if (show_textrels && be_verbose) {
2022 if (which("objdump") != NULL)
2023 has_objdump = 1;
2024 }
2025 /* flatten arrays for display */
2026 if (array_cnt(find_lib_arr))
2027 find_lib = array_flatten_str(find_lib_arr);
2028 if (array_cnt(find_section_arr))
2029 find_section = array_flatten_str(find_section_arr);
1272 /* let the format option override all other options */ 2030 /* let the format option override all other options */
1273 if (out_format) { 2031 if (out_format) {
1274 show_pax = show_phdr = show_textrel = show_rpath = \ 2032 show_pax = show_phdr = show_textrel = show_rpath = \
1275 show_needed = show_interp = show_bind = show_soname = \ 2033 show_needed = show_interp = show_bind = show_soname = \
1276 show_textrels = 0; 2034 show_textrels = show_perms = show_endian = show_size = \
2035 show_osabi = show_eabi = 0;
1277 for (i = 0; out_format[i]; ++i) { 2036 for (i = 0; out_format[i]; ++i) {
1278 if (!IS_MODIFIER(out_format[i])) continue; 2037 if (!IS_MODIFIER(out_format[i])) continue;
1279 2038
1280 switch (out_format[++i]) { 2039 switch (out_format[++i]) {
2040 case '+': break;
1281 case '%': break; 2041 case '%': break;
1282 case '#': break; 2042 case '#': break;
1283 case 'F': break; 2043 case 'F': break;
1284 case 'p': break; 2044 case 'p': break;
1285 case 'f': break; 2045 case 'f': break;
2046 case 'k': break;
1286 case 's': break; 2047 case 's': break;
1287 case 'N': break; 2048 case 'N': break;
1288 case 'o': break; 2049 case 'o': break;
2050 case 'a': break;
2051 case 'M': break;
2052 case 'Z': show_size = 1; break;
2053 case 'D': show_endian = 1; break;
2054 case 'I': show_osabi = 1; break;
2055 case 'Y': show_eabi = 1; break;
2056 case 'O': show_perms = 1; break;
1289 case 'x': show_pax = 1; break; 2057 case 'x': show_pax = 1; break;
1290 case 'e': show_phdr = 1; break; 2058 case 'e': show_phdr = 1; break;
1291 case 't': show_textrel = 1; break; 2059 case 't': show_textrel = 1; break;
1292 case 'r': show_rpath = 1; break; 2060 case 'r': show_rpath = 1; break;
1293 case 'n': show_needed = 1; break; 2061 case 'n': show_needed = 1; break;
1294 case 'i': show_interp = 1; break; 2062 case 'i': show_interp = 1; break;
1295 case 'b': show_bind = 1; break; 2063 case 'b': show_bind = 1; break;
1296 case 'S': show_soname = 1; break; 2064 case 'S': show_soname = 1; break;
1297 case 'T': show_textrels = 1; break; 2065 case 'T': show_textrels = 1; break;
1298 default: 2066 default:
1299 err("Invalid format specifier '%c' (byte %i)", 2067 err("Invalid format specifier '%c' (byte %i)",
1300 out_format[i], i+1); 2068 out_format[i], i+1);
1301 } 2069 }
1302 } 2070 }
1303 2071
1304 /* construct our default format */ 2072 /* construct our default format */
1305 } else { 2073 } else {
1306 size_t fmt_len = 30; 2074 size_t fmt_len = 30;
1307 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2075 out_format = xmalloc(sizeof(char) * fmt_len);
2076 *out_format = '\0';
1308 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2077 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1309 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2078 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2079 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2080 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2081 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2082 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2083 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1310 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2084 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1311 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2085 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1312 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2086 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1313 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2087 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1314 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2088 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1315 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2089 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1316 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2090 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1317 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2091 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1318 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2092 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2093 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1319 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2094 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1320 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2095 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1321 } 2096 }
1322 if (be_verbose > 2) printf("Format: %s\n", out_format); 2097 if (be_verbose > 2) printf("Format: %s\n", out_format);
1323 2098
1324 /* now lets actually do the scanning */ 2099 /* now lets actually do the scanning */
1325 if (scan_ldpath || (show_rpath && be_quiet)) 2100 if (scan_ldpath || use_ldcache)
1326 load_ld_so_conf(); 2101 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1327 if (scan_ldpath) scanelf_ldpath(); 2102 if (scan_ldpath) scanelf_ldpath();
1328 if (scan_envpath) scanelf_envpath(); 2103 if (scan_envpath) scanelf_envpath();
2104 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2105 from_file = "-";
1329 if (from_file) { 2106 if (from_file) {
1330 scanelf_from_file(from_file); 2107 scanelf_from_file(from_file);
1331 free(from_file);
1332 from_file = *argv; 2108 from_file = *argv;
1333 } 2109 }
1334 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2110 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1335 err("Nothing to scan !?"); 2111 err("Nothing to scan !?");
1336 while (optind < argc) { 2112 while (optind < argc) {
1337 search_path = argv[optind++]; 2113 search_path = argv[optind++];
1338 scanelf_dir(search_path); 2114 ret = scanelf_dir(search_path);
1339 } 2115 }
1340 2116
1341 /* clean up */ 2117 /* clean up */
1342 if (versioned_symname) free(versioned_symname);
1343 for (i = 0; ldpaths[i]; ++i)
1344 free(ldpaths[i]); 2118 xarrayfree(ldpaths);
2119 xarrayfree(find_lib_arr);
2120 xarrayfree(find_section_arr);
2121 free(find_lib);
2122 free(find_section);
1345 2123
1346 if (ldcache != 0) 2124 if (ldcache != 0)
1347 munmap(ldcache, ldcache_size); 2125 munmap(ldcache, ldcache_size);
1348}
1349
1350
1351
1352/* utility funcs */
1353static char *xstrdup(const char *s)
1354{
1355 char *ret = strdup(s);
1356 if (!ret) err("Could not strdup(): %s", strerror(errno));
1357 return ret; 2126 return ret;
1358} 2127}
1359static void *xmalloc(size_t size)
1360{
1361 void *ret = malloc(size);
1362 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1363 return ret;
1364}
1365static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1366{
1367 size_t new_len;
1368 2128
1369 new_len = strlen(*dst) + strlen(src); 2129static char **get_split_env(const char *envvar)
1370 if (*curr_len <= new_len) {
1371 *curr_len = new_len + (*curr_len / 2);
1372 *dst = realloc(*dst, *curr_len);
1373 if (!*dst)
1374 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1375 }
1376
1377 if (n)
1378 strncat(*dst, src, n);
1379 else
1380 strcat(*dst, src);
1381}
1382static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1383{ 2130{
1384 static char my_app[2]; 2131 const char *delims = " \t\n";
1385 my_app[0] = append; 2132 char **envvals = NULL;
1386 my_app[1] = '\0'; 2133 char *env, *s;
1387 xstrcat(dst, my_app, curr_len); 2134 int nentry;
1388}
1389 2135
2136 if ((env = getenv(envvar)) == NULL)
2137 return NULL;
1390 2138
2139 env = xstrdup(env);
2140 if (env == NULL)
2141 return NULL;
2142
2143 s = strtok(env, delims);
2144 if (s == NULL) {
2145 free(env);
2146 return NULL;
2147 }
2148
2149 nentry = 0;
2150 while (s != NULL) {
2151 ++nentry;
2152 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2153 envvals[nentry-1] = s;
2154 s = strtok(NULL, delims);
2155 }
2156 envvals[nentry] = NULL;
2157
2158 /* don't want to free(env) as it contains the memory that backs
2159 * the envvals array of strings */
2160 return envvals;
2161}
2162
2163static void parseenv(void)
2164{
2165 color_init(false);
2166 qa_textrels = get_split_env("QA_TEXTRELS");
2167 qa_execstack = get_split_env("QA_EXECSTACK");
2168 qa_wx_load = get_split_env("QA_WX_LOAD");
2169}
2170
2171#ifdef __PAX_UTILS_CLEANUP
2172static void cleanup(void)
2173{
2174 free(out_format);
2175 free(qa_textrels);
2176 free(qa_execstack);
2177 free(qa_wx_load);
2178}
2179#endif
1391 2180
1392int main(int argc, char *argv[]) 2181int main(int argc, char *argv[])
1393{ 2182{
2183 int ret;
1394 if (argc < 2) 2184 if (argc < 2)
1395 usage(EXIT_FAILURE); 2185 usage(EXIT_FAILURE);
2186 parseenv();
1396 parseargs(argc, argv); 2187 ret = parseargs(argc, argv);
1397 fclose(stdout); 2188 fclose(stdout);
1398#ifdef __BOUNDS_CHECKING_ON 2189#ifdef __PAX_UTILS_CLEANUP
1399 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2190 cleanup();
2191 warn("The calls to add/delete heap should be off:\n"
2192 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2193 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1400#endif 2194#endif
1401 return EXIT_SUCCESS; 2195 return ret;
1402} 2196}
2197
2198/* Match filename against entries in matchlist, return TRUE
2199 * if the file is listed */
2200static int file_matches_list(const char *filename, char **matchlist)
2201{
2202 char **file;
2203 char *match;
2204 char buf[__PAX_UTILS_PATH_MAX];
2205
2206 if (matchlist == NULL)
2207 return 0;
2208
2209 for (file = matchlist; *file != NULL; file++) {
2210 if (search_path) {
2211 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2212 match = buf;
2213 } else {
2214 match = *file;
2215 }
2216 if (fnmatch(match, filename, 0) == 0)
2217 return 1;
2218 }
2219 return 0;
2220}

Legend:
Removed from v.1.96  
changed lines
  Added in v.1.229

  ViewVC Help
Powered by ViewVC 1.1.20