/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.96 Revision 1.230
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 1.230 2011/09/27 19:56:15 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 1.230 2011/09/27 19:56:15 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 int bin_in_path(const char *fname)
74{
75 char fullpath[__PAX_UTILS_PATH_MAX];
76 char *path, *p;
77
78 path = getenv("PATH");
79 if (!path)
80 return 0;
81
82 while ((p = strrchr(path, ':')) != NULL) {
83 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
84 *p = 0;
85 if (access(fullpath, R_OK) != -1)
86 return 1;
87 }
88
89 return 0;
90}
91
92/* 1 on failure. 0 otherwise */
93static int rematch(const char *regex, const char *match, int cflags)
94{
95 regex_t preg;
96 int ret;
97
98 if ((match == NULL) || (regex == NULL))
99 return EXIT_FAILURE;
100
101 if ((ret = regcomp(&preg, regex, cflags))) {
102 char err[256];
103
104 if (regerror(ret, &preg, err, sizeof(err)))
105 fprintf(stderr, "regcomp failed: %s", err);
106 else
107 fprintf(stderr, "regcomp failed");
108
109 return EXIT_FAILURE;
110 }
111 ret = regexec(&preg, match, 0, NULL, 0);
112 regfree(&preg);
113
114 return ret;
115}
76 116
77/* sub-funcs for scanelf_file() */ 117/* sub-funcs for scanelf_file() */
78static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 118static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
79{ 119{
80 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 120 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
121
122 /* debug sections */
123 void *symtab = elf_findsecbyname(elf, ".symtab");
124 void *strtab = elf_findsecbyname(elf, ".strtab");
125 /* runtime sections */
126 void *dynsym = elf_findsecbyname(elf, ".dynsym");
127 void *dynstr = elf_findsecbyname(elf, ".dynstr");
128
81#define GET_SYMTABS(B) \ 129#define GET_SYMTABS(B) \
82 if (elf->elf_class == ELFCLASS ## B) { \ 130 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) { \ 131 if (symtab && dynsym) { \
132 Elf ## B ## _Shdr *esymtab = symtab; \
133 Elf ## B ## _Shdr *edynsym = dynsym; \
91 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 134 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
92 } else { \ 135 } else \
93 *sym = (void*)(symtab ? symtab : dynsym); \ 136 *sym = symtab ? symtab : dynsym; \
94 } \
95 if (strtab && dynstr) { \ 137 if (strtab && dynstr) { \
138 Elf ## B ## _Shdr *estrtab = strtab; \
139 Elf ## B ## _Shdr *edynstr = dynstr; \
96 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 140 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
97 } else { \ 141 } else \
98 *tab = (void*)(strtab ? strtab : dynstr); \ 142 *tab = strtab ? strtab : dynstr; \
99 } \
100 } 143 }
101 GET_SYMTABS(32) 144 GET_SYMTABS(32)
102 GET_SYMTABS(64) 145 GET_SYMTABS(64)
103} 146}
147
104static char *scanelf_file_pax(elfobj *elf, char *found_pax) 148static char *scanelf_file_pax(elfobj *elf, char *found_pax)
105{ 149{
106 static char ret[7]; 150 static char ret[7];
107 unsigned long i, shown; 151 unsigned long i, shown;
108 152
117 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
118 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
119 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 163 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
120 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 164 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
121 continue; \ 165 continue; \
122 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 166 if (fix_elf && setpax) { \
167 /* set the paxctl flags */ \
168 ESET(phdr[i].p_flags, setpax); \
169 } \
170 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
123 continue; \ 171 continue; \
124 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 172 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
125 *found_pax = 1; \ 173 *found_pax = 1; \
126 ++shown; \ 174 ++shown; \
127 break; \ 175 break; \
128 } \ 176 } \
129 } 177 }
130 SHOW_PAX(32) 178 SHOW_PAX(32)
131 SHOW_PAX(64) 179 SHOW_PAX(64)
180 }
181
182 if (fix_elf && setpax) {
183 /* set the chpax settings */
184 if (elf->elf_class == ELFCLASS32) {
185 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
186 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
187 } else {
188 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
189 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
190 }
132 } 191 }
133 192
134 /* fall back to EI_PAX if no PT_PAX was found */ 193 /* fall back to EI_PAX if no PT_PAX was found */
135 if (!*ret) { 194 if (!*ret) {
136 static char *paxflags; 195 static char *paxflags;
150 209
151static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 210static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
152{ 211{
153 static char ret[12]; 212 static char ret[12];
154 char *found; 213 char *found;
155 unsigned long i, shown;
156 unsigned char multi_stack, multi_relro, multi_load; 214 unsigned long i, shown, multi_stack, multi_relro, multi_load;
215 int max_pt_load;
157 216
158 if (!show_phdr) return NULL; 217 if (!show_phdr) return NULL;
159 218
160 memcpy(ret, "--- --- ---\0", 12); 219 memcpy(ret, "--- --- ---\0", 12);
161 220
162 shown = 0; 221 shown = 0;
163 multi_stack = multi_relro = multi_load = 0; 222 multi_stack = multi_relro = multi_load = 0;
223 max_pt_load = elf_max_pt_load(elf);
164 224
225#define NOTE_GNU_STACK ".note.GNU-stack"
165#define SHOW_PHDR(B) \ 226#define SHOW_PHDR(B) \
166 if (elf->elf_class == ELFCLASS ## B) { \ 227 if (elf->elf_class == ELFCLASS ## B) { \
167 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 228 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
168 Elf ## B ## _Off offset; \ 229 Elf ## B ## _Off offset; \
169 uint32_t flags, check_flags; \ 230 uint32_t flags, check_flags; \
170 if (elf->phdr != NULL) { \ 231 if (elf->phdr != NULL) { \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 232 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ 233 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
173 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 234 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
235 if (multi_stack++) \
174 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 236 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
237 if (file_matches_list(elf->filename, qa_execstack)) \
238 continue; \
175 found = found_phdr; \ 239 found = found_phdr; \
176 offset = 0; \ 240 offset = 0; \
177 check_flags = PF_X; \ 241 check_flags = PF_X; \
178 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 242 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
243 if (multi_relro++) \
179 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 244 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
180 found = found_relro; \ 245 found = found_relro; \
181 offset = 4; \ 246 offset = 4; \
182 check_flags = PF_X; \ 247 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 248 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
184 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 249 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
250 if (multi_load++ > max_pt_load) \
251 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
252 if (file_matches_list(elf->filename, qa_wx_load)) \
253 continue; \
185 found = found_load; \ 254 found = found_load; \
186 offset = 8; \ 255 offset = 8; \
187 check_flags = PF_W|PF_X; \ 256 check_flags = PF_W|PF_X; \
188 } else \ 257 } else \
189 continue; \ 258 continue; \
190 flags = EGET(phdr[i].p_flags); \ 259 flags = EGET(phdr[i].p_flags); \
191 if (be_quiet && ((flags & check_flags) != check_flags)) \ 260 if (be_quiet && ((flags & check_flags) != check_flags)) \
192 continue; \ 261 continue; \
262 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
263 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
264 ret[3] = ret[7] = '!'; \
265 flags = EGET(phdr[i].p_flags); \
266 } \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ 267 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
194 *found = 1; \ 268 *found = 1; \
195 ++shown; \ 269 ++shown; \
196 } \ 270 } \
197 } else if (elf->shdr != NULL) { \ 271 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \ 272 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ 273 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ 274 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
275 char *str; \
276 if ((void*)strtbl > elf->data_end) \
277 goto skip_this_shdr##B; \
201 check_flags = SHF_WRITE|SHF_EXECINSTR; \ 278 check_flags = SHF_WRITE|SHF_EXECINSTR; \
202 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ 279 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
203 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ 280 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
204 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ 281 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
205 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ 282 str = elf->data + offset; \
283 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
284 if (!strcmp(str, NOTE_GNU_STACK)) { \
206 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ 285 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
207 flags = EGET(shdr[i].sh_flags); \ 286 flags = EGET(shdr[i].sh_flags); \
208 if (be_quiet && ((flags & check_flags) != check_flags)) \ 287 if (be_quiet && ((flags & check_flags) != check_flags)) \
209 continue; \ 288 continue; \
210 ++*found_phdr; \ 289 ++*found_phdr; \
214 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ 293 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
215 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ 294 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
216 break; \ 295 break; \
217 } \ 296 } \
218 } \ 297 } \
298 skip_this_shdr##B: \
219 if (!multi_stack) { \ 299 if (!multi_stack) { \
300 if (file_matches_list(elf->filename, qa_execstack)) \
301 return NULL; \
220 *found_phdr = 1; \ 302 *found_phdr = 1; \
221 shown = 1; \ 303 shown = 1; \
222 memcpy(ret, "!WX", 3); \ 304 memcpy(ret, "!WX", 3); \
223 } \ 305 } \
224 } \ 306 } \
229 if (be_wewy_wewy_quiet || (be_quiet && !shown)) 311 if (be_wewy_wewy_quiet || (be_quiet && !shown))
230 return NULL; 312 return NULL;
231 else 313 else
232 return ret; 314 return ret;
233} 315}
316
317/*
318 * See if this ELF contains a DT_TEXTREL tag in any of its
319 * PT_DYNAMIC sections.
320 */
234static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 321static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
235{ 322{
236 static const char *ret = "TEXTREL"; 323 static const char *ret = "TEXTREL";
237 unsigned long i; 324 unsigned long i;
238 325
239 if (!show_textrel && !show_textrels) return NULL; 326 if (!show_textrel && !show_textrels) return NULL;
327
328 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
240 329
241 if (elf->phdr) { 330 if (elf->phdr) {
242#define SHOW_TEXTREL(B) \ 331#define SHOW_TEXTREL(B) \
243 if (elf->elf_class == ELFCLASS ## B) { \ 332 if (elf->elf_class == ELFCLASS ## B) { \
244 Elf ## B ## _Dyn *dyn; \ 333 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 334 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 335 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Off offset; \ 336 Elf ## B ## _Off offset; \
248 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 337 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
249 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 338 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
250 offset = EGET(phdr[i].p_offset); \ 339 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 340 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
252 dyn = DYN ## B (elf->data + offset); \ 341 dyn = DYN ## B (elf->vdata + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \ 342 while (EGET(dyn->d_tag) != DT_NULL) { \
254 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 343 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
255 *found_textrel = 1; \ 344 *found_textrel = 1; \
256 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 345 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
257 return (be_wewy_wewy_quiet ? NULL : ret); \ 346 return (be_wewy_wewy_quiet ? NULL : ret); \
266 if (be_quiet || be_wewy_wewy_quiet) 355 if (be_quiet || be_wewy_wewy_quiet)
267 return NULL; 356 return NULL;
268 else 357 else
269 return " - "; 358 return " - ";
270} 359}
360
361/*
362 * Scan the .text section to see if there are any relocations in it.
363 * Should rewrite this to check PT_LOAD sections that are marked
364 * Executable rather than the section named '.text'.
365 */
271static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 366static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
272{ 367{
273 unsigned long s, r, rmax; 368 unsigned long s, r, rmax;
274 void *symtab_void, *strtab_void, *text_void; 369 void *symtab_void, *strtab_void, *text_void;
275 370
296 Elf ## B ## _Rela *rela; \ 391 Elf ## B ## _Rela *rela; \
297 /* search the section headers for relocations */ \ 392 /* search the section headers for relocations */ \
298 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 393 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
299 uint32_t sh_type = EGET(shdr[s].sh_type); \ 394 uint32_t sh_type = EGET(shdr[s].sh_type); \
300 if (sh_type == SHT_REL) { \ 395 if (sh_type == SHT_REL) { \
301 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 396 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
302 rela = NULL; \ 397 rela = NULL; \
303 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 398 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
304 } else if (sh_type == SHT_RELA) { \ 399 } else if (sh_type == SHT_RELA) { \
305 rel = NULL; \ 400 rel = NULL; \
306 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 401 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
307 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 402 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
308 } else \ 403 } else \
309 continue; \ 404 continue; \
310 /* now see if any of the relocs are in the .text */ \ 405 /* now see if any of the relocs are in the .text */ \
311 for (r = 0; r < rmax; ++r) { \ 406 for (r = 0; r < rmax; ++r) { \
326 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 421 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
327 if (be_verbose <= 2) continue; \ 422 if (be_verbose <= 2) continue; \
328 } else \ 423 } else \
329 *found_textrels = 1; \ 424 *found_textrels = 1; \
330 /* locate this relocation symbol name */ \ 425 /* locate this relocation symbol name */ \
331 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 426 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
427 if ((void*)sym > elf->data_end) { \
428 warn("%s: corrupt ELF symbol", elf->filename); \
429 continue; \
430 } \
332 sym_max = ELF ## B ## _R_SYM(r_info); \ 431 sym_max = ELF ## B ## _R_SYM(r_info); \
333 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 432 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
334 sym += sym_max; \ 433 sym += sym_max; \
335 else \ 434 else \
336 sym = NULL; \ 435 sym = NULL; \
337 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 436 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
338 /* show the raw details about this reloc */ \ 437 /* show the raw details about this reloc */ \
339 printf(" %s: ", elf->base_filename); \ 438 printf(" %s: ", elf->base_filename); \
340 if (sym && sym->st_name) \ 439 if (sym && sym->st_name) \
341 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 440 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
342 else \ 441 else \
343 printf("(memory/fake?)"); \ 442 printf("(memory/data?)"); \
344 printf(" [0x%lX]", (unsigned long)r_offset); \ 443 printf(" [0x%lX]", (unsigned long)r_offset); \
345 /* now try to find the closest symbol that this rel is probably in */ \ 444 /* now try to find the closest symbol that this rel is probably in */ \
346 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 445 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
347 func = NULL; \ 446 func = NULL; \
348 offset_tmp = 0; \ 447 offset_tmp = 0; \
349 while (sym_max--) { \ 448 while (sym_max--) { \
350 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 449 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
351 func = sym; \ 450 func = sym; \
352 offset_tmp = EGET(sym->st_value); \ 451 offset_tmp = EGET(sym->st_value); \
353 } \ 452 } \
354 ++sym; \ 453 ++sym; \
355 } \ 454 } \
356 printf(" in "); \ 455 printf(" in "); \
357 if (func && func->st_name) \ 456 if (func && func->st_name) { \
358 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 457 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
458 if (r_offset > EGET(func->st_size)) \
459 printf("(optimized out: previous %s)", func_name); \
359 else \ 460 else \
360 printf("(NULL: fake?)"); \ 461 printf("%s", func_name); \
462 } else \
463 printf("(optimized out)"); \
361 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 464 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
465 if (be_verbose && has_objdump) { \
466 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
467 char *sysbuf; \
468 size_t syslen; \
469 int sysret; \
470 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"; \
471 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
472 sysbuf = xmalloc(syslen); \
473 if (end_addr < r_offset) \
474 /* not uncommon when things are optimized out */ \
475 end_addr = r_offset + 0x100; \
476 snprintf(sysbuf, syslen, sysfmt, \
477 (unsigned long)offset_tmp, \
478 (unsigned long)end_addr, \
479 elf->filename, \
480 (unsigned long)r_offset); \
481 fflush(stdout); \
482 sysret = system(sysbuf); \
483 fflush(stdout); \
484 free(sysbuf); \
485 } \
362 } \ 486 } \
363 } } 487 } }
364 SHOW_TEXTRELS(32) 488 SHOW_TEXTRELS(32)
365 SHOW_TEXTRELS(64) 489 SHOW_TEXTRELS(64)
366 } 490 }
368 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 492 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
369 493
370 return NULL; 494 return NULL;
371} 495}
372 496
373static void rpath_security_checks(elfobj *, char *);
374static void rpath_security_checks(elfobj *elf, char *item) { 497static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
498{
375 struct stat st; 499 struct stat st;
376 switch (*item) { 500 switch (*item) {
377 case '/': break; 501 case '/': break;
378 case '.': 502 case '.':
379 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); 503 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
380 break; 504 break;
505 case ':':
381 case '\0': 506 case '\0':
382 warnf("Security problem NULL RPATH in %s", elf->filename); 507 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
383 break; 508 break;
384 case '$': 509 case '$':
385 if (fstat(elf->fd, &st) != -1) 510 if (fstat(elf->fd, &st) != -1)
386 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 511 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", 512 warnf("Security problem with %s='%s' in %s with mode set of %o",
388 item, elf->filename, st.st_mode & 07777); 513 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
389 break; 514 break;
390 default: 515 default:
391 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 516 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
392 break; 517 break;
393 } 518 }
394} 519}
395static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 520static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
396{ 521{
397 unsigned long i, s; 522 unsigned long i;
398 char *rpath, *runpath, **r; 523 char *rpath, *runpath, **r;
399 void *strtbl_void; 524 void *strtbl_void;
400 525
401 if (!show_rpath) return; 526 if (!show_rpath) return;
402 527
413 Elf ## B ## _Off offset; \ 538 Elf ## B ## _Off offset; \
414 Elf ## B ## _Xword word; \ 539 Elf ## B ## _Xword word; \
415 /* Scan all the program headers */ \ 540 /* Scan all the program headers */ \
416 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 541 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
417 /* Just scan dynamic headers */ \ 542 /* Just scan dynamic headers */ \
418 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 543 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
419 offset = EGET(phdr[i].p_offset); \ 544 offset = EGET(phdr[i].p_offset); \
420 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 545 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
421 /* Just scan dynamic RPATH/RUNPATH headers */ \ 546 /* Just scan dynamic RPATH/RUNPATH headers */ \
422 dyn = DYN ## B (elf->data + offset); \ 547 dyn = DYN ## B (elf->vdata + offset); \
423 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 548 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
424 if (word == DT_RPATH) { \ 549 if (word == DT_RPATH) { \
425 r = &rpath; \ 550 r = &rpath; \
426 } else if (word == DT_RUNPATH) { \ 551 } else if (word == DT_RUNPATH) { \
427 r = &runpath; \ 552 r = &runpath; \
431 } \ 556 } \
432 /* Verify the memory is somewhat sane */ \ 557 /* Verify the memory is somewhat sane */ \
433 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 558 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
434 if (offset < (Elf ## B ## _Off)elf->len) { \ 559 if (offset < (Elf ## B ## _Off)elf->len) { \
435 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 560 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
436 *r = (char*)(elf->data + offset); \ 561 *r = elf->data + offset; \
562 /* cache the length in case we need to nuke this section later on */ \
563 if (fix_elf) \
564 offset = strlen(*r); \
437 /* If quiet, don't output paths in ld.so.conf */ \ 565 /* If quiet, don't output paths in ld.so.conf */ \
438 if (be_quiet) { \ 566 if (be_quiet) { \
439 size_t len; \ 567 size_t len; \
440 char *start, *end; \ 568 char *start, *end; \
441 /* note that we only 'chop' off leading known paths. */ \ 569 /* note that we only 'chop' off leading known paths. */ \
442 /* since *r is read-only memory, we can only move the ptr forward. */ \ 570 /* since *r is read-only memory, we can only move the ptr forward. */ \
443 start = *r; \ 571 start = *r; \
444 /* scan each path in : delimited list */ \ 572 /* scan each path in : delimited list */ \
445 while (start) { \ 573 while (start) { \
446 rpath_security_checks(elf, start); \ 574 rpath_security_checks(elf, start, get_elfdtype(word)); \
447 end = strchr(start, ':'); \ 575 end = strchr(start, ':'); \
448 len = (end ? abs(end - start) : strlen(start)); \ 576 len = (end ? abs(end - start) : strlen(start)); \
449 for (s = 0; ldpaths[s]; ++s) { \ 577 if (use_ldcache) { \
578 size_t n; \
579 const char *ldpath; \
580 array_for_each(ldpaths, n, ldpath) \
450 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 581 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
451 *r = (end ? end + 1 : NULL); \ 582 *r = end; \
583 /* corner case ... if RPATH reads "/usr/lib:", we want \
584 * to show ':' rather than '' */ \
585 if (end && end[1] != '\0') \
586 (*r)++; \
452 break; \ 587 break; \
453 } \ 588 } \
454 } \ 589 } \
455 if (!*r || !ldpaths[s] || !end) \ 590 if (!*r || !end) \
456 start = NULL; \ 591 break; \
457 else \ 592 else \
458 start = start + len + 1; \ 593 start = start + len + 1; \
459 } \ 594 } \
460 } \ 595 } \
596 if (*r) { \
597 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
598 /* just nuke it */ \
599 nuke_it##B: \
600 memset(*r, 0x00, offset); \
601 *r = NULL; \
602 ESET(dyn->d_tag, DT_DEBUG); \
603 ESET(dyn->d_un.d_ptr, 0); \
604 } else if (fix_elf) { \
605 /* try to clean "bad" paths */ \
606 size_t len, tmpdir_len; \
607 char *start, *end; \
608 const char *tmpdir; \
609 start = *r; \
610 tmpdir = (getenv("TMPDIR") ? : "."); \
611 tmpdir_len = strlen(tmpdir); \
612 while (1) { \
613 end = strchr(start, ':'); \
614 if (start == end) { \
615 eat_this_path##B: \
616 len = strlen(end); \
617 memmove(start, end+1, len); \
618 start[len-1] = '\0'; \
619 end = start - 1; \
620 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
621 if (!end) { \
622 if (start == *r) \
623 goto nuke_it##B; \
624 *--start = '\0'; \
625 } else \
626 goto eat_this_path##B; \
627 } \
628 if (!end) \
629 break; \
630 start = end + 1; \
631 } \
632 if (**r == '\0') \
633 goto nuke_it##B; \
634 } \
635 if (*r) \
461 if (*r) *found_rpath = 1; \ 636 *found_rpath = 1; \
637 } \
462 } \ 638 } \
463 ++dyn; \ 639 ++dyn; \
464 } \ 640 } \
465 } } 641 } }
466 SHOW_RPATH(32) 642 SHOW_RPATH(32)
488 664
489#define LDSO_CACHE_MAGIC "ld.so-" 665#define LDSO_CACHE_MAGIC "ld.so-"
490#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1) 666#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
491#define LDSO_CACHE_VER "1.7.0" 667#define LDSO_CACHE_VER "1.7.0"
492#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1) 668#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
669#define FLAG_ANY -1
670#define FLAG_TYPE_MASK 0x00ff
671#define FLAG_LIBC4 0x0000
672#define FLAG_ELF 0x0001
673#define FLAG_ELF_LIBC5 0x0002
674#define FLAG_ELF_LIBC6 0x0003
675#define FLAG_REQUIRED_MASK 0xff00
676#define FLAG_SPARC_LIB64 0x0100
677#define FLAG_IA64_LIB64 0x0200
678#define FLAG_X8664_LIB64 0x0300
679#define FLAG_S390_LIB64 0x0400
680#define FLAG_POWERPC_LIB64 0x0500
681#define FLAG_MIPS64_LIBN32 0x0600
682#define FLAG_MIPS64_LIBN64 0x0700
493 683
494static char *lookup_cache_lib(char *); 684#if defined(__GLIBC__) || defined(__UCLIBC__)
685
495static char *lookup_cache_lib(char *fname) 686static char *lookup_cache_lib(elfobj *elf, char *fname)
496{ 687{
497 int fd = 0; 688 int fd;
498 char *strs; 689 char *strs;
499 static char buf[_POSIX_PATH_MAX] = ""; 690 static char buf[__PAX_UTILS_PATH_MAX] = "";
500 const char *cachefile = "/etc/ld.so.cache"; 691 const char cachefile[] = "/etc/ld.so.cache";
501 struct stat st; 692 struct stat st;
502 693
503 typedef struct { 694 typedef struct {
504 char magic[LDSO_CACHE_MAGIC_LEN]; 695 char magic[LDSO_CACHE_MAGIC_LEN];
505 char version[LDSO_CACHE_VER_LEN]; 696 char version[LDSO_CACHE_VER_LEN];
506 int nlibs; 697 int nlibs;
507 } header_t; 698 } header_t;
699 header_t *header;
508 700
509 typedef struct { 701 typedef struct {
510 int flags; 702 int flags;
511 int sooffset; 703 int sooffset;
512 int liboffset; 704 int liboffset;
513 } libentry_t; 705 } libentry_t;
514
515 header_t *header;
516 libentry_t *libent; 706 libentry_t *libent;
517 707
518 if (fname == NULL) 708 if (fname == NULL)
519 return NULL; 709 return NULL;
520 710
521 if (ldcache == 0) { 711 if (ldcache == NULL) {
522 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) < 0) 712 if (stat(cachefile, &st))
523 return NULL; 713 return NULL;
524 /* save the cache size for latter unmapping */ 714
715 fd = open(cachefile, O_RDONLY);
716 if (fd == -1)
717 return NULL;
718
719 /* cache these values so we only map/unmap the cache file once */
525 ldcache_size = st.st_size; 720 ldcache_size = st.st_size;
721 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
722 close(fd);
526 723
527 if ((ldcache = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0)) == (caddr_t) -1) 724 if (ldcache == MAP_FAILED) {
725 ldcache = NULL;
528 return NULL; 726 return NULL;
727 }
529 728
530 close(fd);
531
532 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) 729 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
730 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
731 {
732 munmap(ldcache, ldcache_size);
733 ldcache = NULL;
533 return NULL; 734 return NULL;
534
535 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
536 return NULL;
537 } 735 }
736 } else
737 header = ldcache;
538 738
539 header = (header_t *) ldcache;
540 libent = (libentry_t *) (ldcache + sizeof(header_t)); 739 libent = ldcache + sizeof(header_t);
541 strs = (char *) &libent[header->nlibs]; 740 strs = (char *) &libent[header->nlibs];
542 741
543 for (fd = 0; fd < header->nlibs; fd++) { 742 for (fd = 0; fd < header->nlibs; ++fd) {
743 /* This should be more fine grained, but for now we assume that
744 * diff arches will not be cached together, and we ignore the
745 * the different multilib mips cases.
746 */
747 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
748 continue;
749 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
750 continue;
751
544 if (strcmp(fname, strs + libent[fd].sooffset) != 0) 752 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
545 continue; 753 continue;
754
755 /* Return first hit because that is how the ldso rolls */
546 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf)); 756 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
757 break;
547 } 758 }
759
548 return buf; 760 return buf;
549} 761}
550 762
763#elif defined(__NetBSD__)
764static char *lookup_cache_lib(elfobj *elf, char *fname)
765{
766 static char buf[__PAX_UTILS_PATH_MAX] = "";
767 static struct stat st;
768 size_t n;
769 char *ldpath;
770
771 array_for_each(ldpath, n, ldpath) {
772 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
773 continue; /* if the pathname is too long, or something went wrong, ignore */
774
775 if (stat(buf, &st) != 0)
776 continue; /* if the lib doesn't exist in *ldpath, look further */
777
778 /* NetBSD doesn't actually do sanity checks, it just loads the file
779 * and if that doesn't work, continues looking in other directories.
780 * This cannot easily be safely emulated, unfortunately. For now,
781 * just assume that if it exists, it's a valid library. */
782
783 return buf;
784 }
785
786 /* not found in any path */
787 return NULL;
788}
789#else
790#ifdef __ELF__
791#warning Cache support not implemented for your target
792#endif
793static char *lookup_cache_lib(elfobj *elf, char *fname)
794{
795 return NULL;
796}
797#endif
551 798
552static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 799static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
553{ 800{
554 unsigned long i; 801 unsigned long i;
555 char *needed; 802 char *needed;
556 void *strtbl_void; 803 void *strtbl_void;
557 char *p; 804 char *p;
558 805
806 /*
807 * -n -> op==0 -> print all
808 * -N -> op==1 -> print requested
809 */
559 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 810 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
811 return NULL;
560 812
561 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 813 strtbl_void = elf_findsecbyname(elf, ".dynstr");
562 814
563 if (elf->phdr && strtbl_void) { 815 if (elf->phdr && strtbl_void) {
564#define SHOW_NEEDED(B) \ 816#define SHOW_NEEDED(B) \
566 Elf ## B ## _Dyn *dyn; \ 818 Elf ## B ## _Dyn *dyn; \
567 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 819 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
568 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 820 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
569 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 821 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
570 Elf ## B ## _Off offset; \ 822 Elf ## B ## _Off offset; \
823 size_t matched = 0; \
824 /* Walk all the program headers to find the PT_DYNAMIC */ \
571 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 825 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
572 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 826 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
827 continue; \
573 offset = EGET(phdr[i].p_offset); \ 828 offset = EGET(phdr[i].p_offset); \
574 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 829 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
830 continue; \
831 /* Walk all the dynamic tags to find NEEDED entries */ \
575 dyn = DYN ## B (elf->data + offset); \ 832 dyn = DYN ## B (elf->vdata + offset); \
576 while (EGET(dyn->d_tag) != DT_NULL) { \ 833 while (EGET(dyn->d_tag) != DT_NULL) { \
577 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 834 if (EGET(dyn->d_tag) == DT_NEEDED) { \
578 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 835 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
579 if (offset >= (Elf ## B ## _Off)elf->len) { \ 836 if (offset >= (Elf ## B ## _Off)elf->len) { \
580 ++dyn; \ 837 ++dyn; \
581 continue; \ 838 continue; \
582 } \ 839 } \
583 needed = (char*)(elf->data + offset); \ 840 needed = elf->data + offset; \
584 if (op == 0) { \ 841 if (op == 0) { \
842 /* -n -> print all entries */ \
585 if (!be_wewy_wewy_quiet) { \ 843 if (!be_wewy_wewy_quiet) { \
586 if (*found_needed) xchrcat(ret, ',', ret_len); \ 844 if (*found_needed) xchrcat(ret, ',', ret_len); \
587 if (printcache) \ 845 if (use_ldcache) \
588 if ((p = lookup_cache_lib(needed)) != NULL) \ 846 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
589 needed = p; \ 847 needed = p; \
590 xstrcat(ret, needed, ret_len); \ 848 xstrcat(ret, needed, ret_len); \
591 } \ 849 } \
592 *found_needed = 1; \ 850 *found_needed = 1; \
593 } else { \ 851 } else { \
594 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 852 /* -N -> print matching entries */ \
853 size_t n; \
854 const char *find_lib_name; \
855 \
856 array_for_each(find_lib_arr, n, find_lib_name) \
857 if (!strcmp(find_lib_name, needed)) \
858 ++matched; \
859 \
860 if (matched == array_cnt(find_lib_arr)) { \
595 *found_lib = 1; \ 861 *found_lib = 1; \
596 return (be_wewy_wewy_quiet ? NULL : needed); \ 862 return (be_wewy_wewy_quiet ? NULL : find_lib); \
597 } \ 863 } \
598 } \ 864 } \
599 } \ 865 } \
600 ++dyn; \ 866 ++dyn; \
601 } \ 867 } \
630} 896}
631static char *scanelf_file_bind(elfobj *elf, char *found_bind) 897static char *scanelf_file_bind(elfobj *elf, char *found_bind)
632{ 898{
633 unsigned long i; 899 unsigned long i;
634 struct stat s; 900 struct stat s;
901 char dynamic = 0;
635 902
636 if (!show_bind) return NULL; 903 if (!show_bind) return NULL;
637 if (!elf->phdr) return NULL; 904 if (!elf->phdr) return NULL;
638 905
639#define SHOW_BIND(B) \ 906#define SHOW_BIND(B) \
641 Elf ## B ## _Dyn *dyn; \ 908 Elf ## B ## _Dyn *dyn; \
642 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 909 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
643 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 910 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
644 Elf ## B ## _Off offset; \ 911 Elf ## B ## _Off offset; \
645 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 912 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
646 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 913 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
914 dynamic = 1; \
647 offset = EGET(phdr[i].p_offset); \ 915 offset = EGET(phdr[i].p_offset); \
648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 916 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
649 dyn = DYN ## B (elf->data + offset); \ 917 dyn = DYN ## B (elf->vdata + offset); \
650 while (EGET(dyn->d_tag) != DT_NULL) { \ 918 while (EGET(dyn->d_tag) != DT_NULL) { \
651 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 919 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
652 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 920 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
653 { \ 921 { \
654 if (be_quiet) return NULL; \ 922 if (be_quiet) return NULL; \
662 SHOW_BIND(32) 930 SHOW_BIND(32)
663 SHOW_BIND(64) 931 SHOW_BIND(64)
664 932
665 if (be_wewy_wewy_quiet) return NULL; 933 if (be_wewy_wewy_quiet) return NULL;
666 934
935 /* 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)) { 936 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
668 return NULL; 937 return NULL;
669 } else { 938 } else {
670 *found_bind = 1; 939 *found_bind = 1;
671 return (char *) "LAZY"; 940 return (char *)(dynamic ? "LAZY" : "STATIC");
672 } 941 }
673} 942}
674static char *scanelf_file_soname(elfobj *elf, char *found_soname) 943static char *scanelf_file_soname(elfobj *elf, char *found_soname)
675{ 944{
676 unsigned long i; 945 unsigned long i;
688 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 957 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
689 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 958 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
690 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 959 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
691 Elf ## B ## _Off offset; \ 960 Elf ## B ## _Off offset; \
692 /* only look for soname in shared objects */ \ 961 /* only look for soname in shared objects */ \
693 if (ehdr->e_type != ET_DYN) \ 962 if (EGET(ehdr->e_type) != ET_DYN) \
694 return NULL; \ 963 return NULL; \
695 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 964 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
696 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 965 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
697 offset = EGET(phdr[i].p_offset); \ 966 offset = EGET(phdr[i].p_offset); \
698 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 967 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
699 dyn = DYN ## B (elf->data + offset); \ 968 dyn = DYN ## B (elf->vdata + offset); \
700 while (EGET(dyn->d_tag) != DT_NULL) { \ 969 while (EGET(dyn->d_tag) != DT_NULL) { \
701 if (EGET(dyn->d_tag) == DT_SONAME) { \ 970 if (EGET(dyn->d_tag) == DT_SONAME) { \
702 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 971 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
703 if (offset >= (Elf ## B ## _Off)elf->len) { \ 972 if (offset >= (Elf ## B ## _Off)elf->len) { \
704 ++dyn; \ 973 ++dyn; \
705 continue; \ 974 continue; \
706 } \ 975 } \
707 soname = (char*)(elf->data + offset); \ 976 soname = elf->data + offset; \
708 *found_soname = 1; \ 977 *found_soname = 1; \
709 return (be_wewy_wewy_quiet ? NULL : soname); \ 978 return (be_wewy_wewy_quiet ? NULL : soname); \
710 } \ 979 } \
711 ++dyn; \ 980 ++dyn; \
712 } \ 981 } \
715 SHOW_SONAME(64) 984 SHOW_SONAME(64)
716 } 985 }
717 986
718 return NULL; 987 return NULL;
719} 988}
989
990/*
991 * We support the symbol form:
992 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
993 * If the symbol name is empty, then all symbols are matched.
994 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
995 * Do not rely on this output format at all.
996 * Otherwise the symbol name is used to search (either regex or string compare).
997 * If the first char of the symbol name is a plus ("+"), then only match
998 * defined symbols. If it's a minus ("-"), only match undefined symbols.
999 * Putting modifiers in between the percent signs allows for more in depth
1000 * filters. There are groups of modifiers. If you don't specify a member
1001 * of a group, then all types in that group are matched. The current
1002 * groups and their types are:
1003 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
1004 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1005 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1006 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1007 * You can search for multiple symbols at once by seperating with a comma (",").
1008 *
1009 * Some examples:
1010 * ELFs with a weak function "foo":
1011 * scanelf -s %wf%foo <ELFs>
1012 * ELFs that define the symbol "main":
1013 * scanelf -s +main <ELFs>
1014 * scanelf -s %d%main <ELFs>
1015 * ELFs that refer to the undefined symbol "brk":
1016 * scanelf -s -brk <ELFs>
1017 * scanelf -s %u%brk <ELFs>
1018 * All global defined objects in an ELF:
1019 * scanelf -s %ogd% <ELF>
1020 */
1021static void
1022scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1023 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1024{
1025 char *this_sym, *next_sym, saved = saved;
1026
1027 /* allow the user to specify a comma delimited list of symbols to search for */
1028 next_sym = NULL;
1029 do {
1030 bool inc_notype, inc_object, inc_func, inc_file,
1031 inc_local, inc_global, inc_weak,
1032 inc_def, inc_undef, inc_abs, inc_common;
1033
1034 if (next_sym) {
1035 next_sym[-1] = saved;
1036 this_sym = next_sym;
1037 } else
1038 this_sym = find_sym;
1039 if ((next_sym = strchr(this_sym, ','))) {
1040 /* make parsing easier by killing the comma temporarily */
1041 saved = *next_sym;
1042 *next_sym = '\0';
1043 next_sym += 1;
1044 }
1045
1046 /* symbol selection! */
1047 inc_notype = inc_object = inc_func = inc_file = \
1048 inc_local = inc_global = inc_weak = \
1049 inc_def = inc_undef = inc_abs = inc_common = \
1050 (*this_sym != '%');
1051
1052 /* parse the contents of %...% */
1053 if (!inc_notype) {
1054 while (*(this_sym++)) {
1055 if (*this_sym == '%') {
1056 ++this_sym;
1057 break;
1058 }
1059 switch (*this_sym) {
1060 case 'n': inc_notype = true; break;
1061 case 'o': inc_object = true; break;
1062 case 'f': inc_func = true; break;
1063 case 'F': inc_file = true; break;
1064 case 'l': inc_local = true; break;
1065 case 'g': inc_global = true; break;
1066 case 'w': inc_weak = true; break;
1067 case 'd': inc_def = true; break;
1068 case 'u': inc_undef = true; break;
1069 case 'a': inc_abs = true; break;
1070 case 'c': inc_common = true; break;
1071 default: err("invalid symbol selector '%c'", *this_sym);
1072 }
1073 }
1074
1075 /* If no types are matched, not match all */
1076 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1077 inc_notype = inc_object = inc_func = inc_file = true;
1078 if (!inc_local && !inc_global && !inc_weak)
1079 inc_local = inc_global = inc_weak = true;
1080 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1081 inc_def = inc_undef = inc_abs = inc_common = true;
1082
1083 /* backwards compat for defined/undefined short hand */
1084 } else if (*this_sym == '+') {
1085 inc_undef = false;
1086 ++this_sym;
1087 } else if (*this_sym == '-') {
1088 inc_def = inc_abs = inc_common = false;
1089 ++this_sym;
1090 }
1091
1092 /* filter symbols */
1093 if ((!inc_notype && stt == STT_NOTYPE) || \
1094 (!inc_object && stt == STT_OBJECT) || \
1095 (!inc_func && stt == STT_FUNC ) || \
1096 (!inc_file && stt == STT_FILE ) || \
1097 (!inc_local && stb == STB_LOCAL ) || \
1098 (!inc_global && stb == STB_GLOBAL) || \
1099 (!inc_weak && stb == STB_WEAK ) || \
1100 (!inc_def && shn && shn < SHN_LORESERVE) || \
1101 (!inc_undef && shn == SHN_UNDEF ) || \
1102 (!inc_abs && shn == SHN_ABS ) || \
1103 (!inc_common && shn == SHN_COMMON))
1104 continue;
1105
1106 if (*this_sym == '*') {
1107 /* a "*" symbol gets you debug output */
1108 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1109 ((*found_sym == 0) ? "\n\t" : "\t"),
1110 elf->base_filename,
1111 size,
1112 get_elfstttype(stt),
1113 get_elfstbtype(stb),
1114 get_elfshntype(shn),
1115 symname);
1116 goto matched;
1117
1118 } else {
1119 if (g_match) {
1120 /* regex match the symbol */
1121 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1122 continue;
1123
1124 } else if (*this_sym) {
1125 /* give empty symbols a "pass", else do a normal compare */
1126 const size_t len = strlen(this_sym);
1127 if (!(strncmp(this_sym, symname, len) == 0 &&
1128 /* Accept unversioned symbol names */
1129 (symname[len] == '\0' || symname[len] == '@')))
1130 continue;
1131 }
1132
1133 if (be_semi_verbose) {
1134 char buf[1024];
1135 snprintf(buf, sizeof(buf), "%lX %s %s",
1136 size,
1137 get_elfstttype(stt),
1138 this_sym);
1139 *ret = xstrdup(buf);
1140 } else {
1141 if (*ret) xchrcat(ret, ',', ret_len);
1142 xstrcat(ret, symname, ret_len);
1143 }
1144
1145 goto matched;
1146 }
1147 } while (next_sym);
1148
1149 return;
1150
1151 matched:
1152 *found_sym = 1;
1153 if (next_sym)
1154 next_sym[-1] = saved;
1155}
1156
720static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1157static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
721{ 1158{
722 unsigned long i; 1159 unsigned long i;
723 char *ret; 1160 char *ret;
724 void *symtab_void, *strtab_void; 1161 void *symtab_void, *strtab_void;
725 1162
726 if (!find_sym) return NULL; 1163 if (!find_sym) return NULL;
727 ret = find_sym; 1164 ret = NULL;
728 1165
729 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1166 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
730 1167
731 if (symtab_void && strtab_void) { 1168 if (symtab_void && strtab_void) {
732#define FIND_SYM(B) \ 1169#define FIND_SYM(B) \
733 if (elf->elf_class == ELFCLASS ## B) { \ 1170 if (elf->elf_class == ELFCLASS ## B) { \
734 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1171 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
735 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1172 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
736 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1173 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
737 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1174 unsigned long cnt = EGET(symtab->sh_entsize); \
738 char *symname; \ 1175 char *symname; \
1176 size_t ret_len = 0; \
1177 if (cnt) \
1178 cnt = EGET(symtab->sh_size) / cnt; \
739 for (i = 0; i < cnt; ++i) { \ 1179 for (i = 0; i < cnt; ++i) { \
1180 if ((void*)sym > elf->data_end) { \
1181 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1182 goto break_out; \
1183 } \
740 if (sym->st_name) { \ 1184 if (sym->st_name) { \
1185 /* make sure the symbol name is in acceptable memory range */ \
741 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1186 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
742 if (*find_sym == '*') { \ 1187 if ((void*)symname > elf->data_end) { \
743 printf("%s(%s) %5lX %15s %s\n", \ 1188 warnf("%s: corrupt ELF symbols", elf->filename); \
744 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1189 ++sym; \
745 elf->base_filename, \ 1190 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 } \ 1191 } \
1192 scanelf_match_symname(elf, found_sym, \
1193 &ret, &ret_len, symname, \
1194 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1195 ELF##B##_ST_BIND(EGET(sym->st_info)), \
1196 EGET(sym->st_shndx), \
1197 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1198 EGET(sym->st_size)); \
766 } \ 1199 } \
767 ++sym; \ 1200 ++sym; \
768 } } 1201 } }
769 FIND_SYM(32) 1202 FIND_SYM(32)
770 FIND_SYM(64) 1203 FIND_SYM(64)
776 if (*find_sym != '*' && *found_sym) 1209 if (*find_sym != '*' && *found_sym)
777 return ret; 1210 return ret;
778 if (be_quiet) 1211 if (be_quiet)
779 return NULL; 1212 return NULL;
780 else 1213 else
781 return (char *)" - "; 1214 return " - ";
782} 1215}
1216
1217static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1218{
1219 if (!find_section)
1220 return NULL;
1221
1222#define FIND_SECTION(B) \
1223 if (elf->elf_class == ELFCLASS ## B) { \
1224 size_t matched, n; \
1225 int invert; \
1226 const char *section_name; \
1227 Elf ## B ## _Shdr *section; \
1228 \
1229 matched = 0; \
1230 array_for_each(find_section_arr, n, section_name) { \
1231 invert = (*section_name == '!' ? 1 : 0); \
1232 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1233 if ((section == NULL && invert) || (section != NULL && !invert)) \
1234 ++matched; \
1235 } \
1236 \
1237 if (matched == array_cnt(find_section_arr)) \
1238 *found_section = 1; \
1239 }
1240 FIND_SECTION(32)
1241 FIND_SECTION(64)
1242
1243 if (be_wewy_wewy_quiet)
1244 return NULL;
1245
1246 if (*found_section)
1247 return find_section;
1248
1249 if (be_quiet)
1250 return NULL;
1251 else
1252 return " - ";
1253}
1254
783/* scan an elf file and show all the fun stuff */ 1255/* scan an elf file and show all the fun stuff */
784#define prints(str) write(fileno(stdout), str, strlen(str)) 1256#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
785static void scanelf_file(const char *filename) 1257static int scanelf_elfobj(elfobj *elf)
786{ 1258{
787 unsigned long i; 1259 unsigned long i;
788 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1260 char found_pax, found_phdr, found_relro, found_load, found_textrel,
789 found_rpath, found_needed, found_interp, found_bind, found_soname, 1261 found_rpath, found_needed, found_interp, found_bind, found_soname,
790 found_sym, found_lib, found_file, found_textrels; 1262 found_sym, found_lib, found_file, found_textrels, found_section;
791 elfobj *elf;
792 struct stat st;
793 static char *out_buffer = NULL; 1263 static char *out_buffer = NULL;
794 static size_t out_len; 1264 static size_t out_len;
795 1265
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 = \ 1266 found_pax = found_phdr = found_relro = found_load = found_textrel = \
812 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1267 found_rpath = found_needed = found_interp = found_bind = found_soname = \
813 found_sym = found_lib = found_file = found_textrels = 0; 1268 found_sym = found_lib = found_file = found_textrels = found_section = 0;
814 1269
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) 1270 if (be_verbose > 2)
822 printf("%s: scanning file {%s,%s}\n", filename, 1271 printf("%s: scanning file {%s,%s}\n", elf->filename,
823 get_elfeitype(EI_CLASS, elf->elf_class), 1272 get_elfeitype(EI_CLASS, elf->elf_class),
824 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1273 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
825 else if (be_verbose) 1274 else if (be_verbose > 1)
826 printf("%s: scanning file\n", filename); 1275 printf("%s: scanning file\n", elf->filename);
827 1276
828 /* init output buffer */ 1277 /* init output buffer */
829 if (!out_buffer) { 1278 if (!out_buffer) {
830 out_len = sizeof(char) * 80; 1279 out_len = sizeof(char) * 80;
831 out_buffer = (char*)xmalloc(out_len); 1280 out_buffer = xmalloc(out_len);
832 } 1281 }
833 *out_buffer = '\0'; 1282 *out_buffer = '\0';
834 1283
835 /* show the header */ 1284 /* show the header */
836 if (!be_quiet && show_banner) { 1285 if (!be_quiet && show_banner) {
837 for (i = 0; out_format[i]; ++i) { 1286 for (i = 0; out_format[i]; ++i) {
838 if (!IS_MODIFIER(out_format[i])) continue; 1287 if (!IS_MODIFIER(out_format[i])) continue;
839 1288
840 switch (out_format[++i]) { 1289 switch (out_format[++i]) {
1290 case '+': break;
841 case '%': break; 1291 case '%': break;
842 case '#': break; 1292 case '#': break;
843 case 'F': 1293 case 'F':
844 case 'p': 1294 case 'p':
845 case 'f': prints("FILE "); found_file = 1; break; 1295 case 'f': prints("FILE "); found_file = 1; break;
846 case 'o': prints(" TYPE "); break; 1296 case 'o': prints(" TYPE "); break;
847 case 'x': prints(" PAX "); break; 1297 case 'x': prints(" PAX "); break;
848 case 'e': prints("STK/REL/PTL "); break; 1298 case 'e': prints("STK/REL/PTL "); break;
849 case 't': prints("TEXTREL "); break; 1299 case 't': prints("TEXTREL "); break;
850 case 'r': prints("RPATH "); break; 1300 case 'r': prints("RPATH "); break;
1301 case 'M': prints("CLASS "); break;
851 case 'n': prints("NEEDED "); break; 1302 case 'n': prints("NEEDED "); break;
852 case 'i': prints("INTERP "); break; 1303 case 'i': prints("INTERP "); break;
853 case 'b': prints("BIND "); break; 1304 case 'b': prints("BIND "); break;
1305 case 'Z': prints("SIZE "); break;
854 case 'S': prints("SONAME "); break; 1306 case 'S': prints("SONAME "); break;
855 case 's': prints("SYM "); break; 1307 case 's': prints("SYM "); break;
856 case 'N': prints("LIB "); break; 1308 case 'N': prints("LIB "); break;
857 case 'T': prints("TEXTRELS "); break; 1309 case 'T': prints("TEXTRELS "); break;
1310 case 'k': prints("SECTION "); break;
1311 case 'a': prints("ARCH "); break;
1312 case 'I': prints("OSABI "); break;
1313 case 'Y': prints("EABI "); break;
1314 case 'O': prints("PERM "); break;
1315 case 'D': prints("ENDIAN "); break;
858 default: warnf("'%c' has no title ?", out_format[i]); 1316 default: warnf("'%c' has no title ?", out_format[i]);
859 } 1317 }
860 } 1318 }
861 if (!found_file) prints("FILE "); 1319 if (!found_file) prints("FILE ");
862 prints("\n"); 1320 prints("\n");
866 1324
867 /* dump all the good stuff */ 1325 /* dump all the good stuff */
868 for (i = 0; out_format[i]; ++i) { 1326 for (i = 0; out_format[i]; ++i) {
869 const char *out; 1327 const char *out;
870 const char *tmp; 1328 const char *tmp;
871 1329 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])) { 1330 if (!IS_MODIFIER(out_format[i])) {
877 xchrcat(&out_buffer, out_format[i], &out_len); 1331 xchrcat(&out_buffer, out_format[i], &out_len);
878 continue; 1332 continue;
879 } 1333 }
880 1334
881 out = NULL; 1335 out = NULL;
882 be_wewy_wewy_quiet = (out_format[i] == '#'); 1336 be_wewy_wewy_quiet = (out_format[i] == '#');
1337 be_semi_verbose = (out_format[i] == '+');
883 switch (out_format[++i]) { 1338 switch (out_format[++i]) {
1339 case '+':
884 case '%': 1340 case '%':
885 case '#': 1341 case '#':
886 xchrcat(&out_buffer, out_format[i], &out_len); break; 1342 xchrcat(&out_buffer, out_format[i], &out_len); break;
887 case 'F': 1343 case 'F':
888 found_file = 1; 1344 found_file = 1;
889 if (be_wewy_wewy_quiet) break; 1345 if (be_wewy_wewy_quiet) break;
890 xstrcat(&out_buffer, filename, &out_len); 1346 xstrcat(&out_buffer, elf->filename, &out_len);
891 break; 1347 break;
892 case 'p': 1348 case 'p':
893 found_file = 1; 1349 found_file = 1;
894 if (be_wewy_wewy_quiet) break; 1350 if (be_wewy_wewy_quiet) break;
895 tmp = filename; 1351 tmp = elf->filename;
896 if (search_path) { 1352 if (search_path) {
897 ssize_t len_search = strlen(search_path); 1353 ssize_t len_search = strlen(search_path);
898 ssize_t len_file = strlen(filename); 1354 ssize_t len_file = strlen(elf->filename);
899 if (!strncmp(filename, search_path, len_search) && \ 1355 if (!strncmp(elf->filename, search_path, len_search) && \
900 len_file > len_search) 1356 len_file > len_search)
901 tmp += len_search; 1357 tmp += len_search;
902 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1358 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
903 } 1359 }
904 xstrcat(&out_buffer, tmp, &out_len); 1360 xstrcat(&out_buffer, tmp, &out_len);
905 break; 1361 break;
906 case 'f': 1362 case 'f':
907 found_file = 1; 1363 found_file = 1;
908 if (be_wewy_wewy_quiet) break; 1364 if (be_wewy_wewy_quiet) break;
909 tmp = strrchr(filename, '/'); 1365 tmp = strrchr(elf->filename, '/');
910 tmp = (tmp == NULL ? filename : tmp+1); 1366 tmp = (tmp == NULL ? elf->filename : tmp+1);
911 xstrcat(&out_buffer, tmp, &out_len); 1367 xstrcat(&out_buffer, tmp, &out_len);
912 break; 1368 break;
913 case 'o': out = get_elfetype(elf); break; 1369 case 'o': out = get_elfetype(elf); break;
914 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1370 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; 1371 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; 1372 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
917 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1373 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; 1374 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1375 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1376 case 'D': out = get_endian(elf); break;
1377 case 'O': out = strfileperms(elf->filename); break;
919 case 'n': 1378 case 'n':
920 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1379 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; 1380 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
922 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1381 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
923 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1382 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
924 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1383 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1384 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1385 case 'a': out = get_elfemtype(elf); break;
1386 case 'I': out = get_elfosabi(elf); break;
1387 case 'Y': out = get_elf_eabi(elf); break;
1388 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]); 1389 default: warnf("'%c' has no scan code?", out_format[i]);
926 } 1390 }
927 if (out) { 1391 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); 1392 xstrcat(&out_buffer, out, &out_len);
933 }
934 } 1393 }
935 1394
936#define FOUND_SOMETHING() \ 1395#define FOUND_SOMETHING() \
937 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1396 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
938 found_rpath || found_needed || found_interp || found_bind || \ 1397 found_rpath || found_needed || found_interp || found_bind || \
939 found_soname || found_sym || found_lib || found_textrels) 1398 found_soname || found_sym || found_lib || found_textrels || found_section )
940 1399
941 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1400 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
942 xchrcat(&out_buffer, ' ', &out_len); 1401 xchrcat(&out_buffer, ' ', &out_len);
943 xstrcat(&out_buffer, filename, &out_len); 1402 xstrcat(&out_buffer, elf->filename, &out_len);
944 } 1403 }
945 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1404 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
946 puts(out_buffer); 1405 puts(out_buffer);
947 fflush(stdout); 1406 fflush(stdout);
948 } 1407 }
949 1408
1409 return 0;
1410}
1411
1412/* scan a single elf */
1413static int scanelf_elf(const char *filename, int fd, size_t len)
1414{
1415 int ret = 1;
1416 elfobj *elf;
1417
1418 /* verify this is real ELF */
1419 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1420 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1421 return ret;
1422 }
1423 switch (match_bits) {
1424 case 32:
1425 if (elf->elf_class != ELFCLASS32)
1426 goto label_done;
1427 break;
1428 case 64:
1429 if (elf->elf_class != ELFCLASS64)
1430 goto label_done;
1431 break;
1432 default: break;
1433 }
1434 if (match_etypes) {
1435 char sbuf[126];
1436 strncpy(sbuf, match_etypes, sizeof(sbuf));
1437 if (strchr(match_etypes, ',') != NULL) {
1438 char *p;
1439 while ((p = strrchr(sbuf, ',')) != NULL) {
1440 *p = 0;
1441 if (etype_lookup(p+1) == get_etype(elf))
1442 goto label_ret;
1443 }
1444 }
1445 if (etype_lookup(sbuf) != get_etype(elf))
1446 goto label_done;
1447 }
1448
1449label_ret:
1450 ret = scanelf_elfobj(elf);
1451
1452label_done:
950 unreadelf(elf); 1453 unreadelf(elf);
1454 return ret;
1455}
1456
1457/* scan an archive of elfs */
1458static int scanelf_archive(const char *filename, int fd, size_t len)
1459{
1460 archive_handle *ar;
1461 archive_member *m;
1462 char *ar_buffer;
1463 elfobj *elf;
1464
1465 ar = ar_open_fd(filename, fd);
1466 if (ar == NULL)
1467 return 1;
1468
1469 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1470 while ((m = ar_next(ar)) != NULL) {
1471 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1472 if (cur_pos == -1)
1473 errp("lseek() failed");
1474 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1475 if (elf) {
1476 scanelf_elfobj(elf);
1477 unreadelf(elf);
1478 }
1479 }
1480 munmap(ar_buffer, len);
1481
1482 return 0;
1483}
1484/* scan a file which may be an elf or an archive or some other magical beast */
1485static int scanelf_file(const char *filename, const struct stat *st_cache)
1486{
1487 const struct stat *st = st_cache;
1488 struct stat symlink_st;
1489 int fd;
1490
1491 /* always handle regular files and handle symlinked files if no -y */
1492 if (S_ISLNK(st->st_mode)) {
1493 if (!scan_symlink) return 1;
1494 stat(filename, &symlink_st);
1495 st = &symlink_st;
1496 }
1497
1498 if (!S_ISREG(st->st_mode)) {
1499 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1500 return 1;
1501 }
1502
1503 if (match_perms) {
1504 if ((st->st_mode | match_perms) != st->st_mode)
1505 return 1;
1506 }
1507 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1508 return 1;
1509
1510 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1511 /* if it isn't an ELF, maybe it's an .a archive */
1512 scanelf_archive(filename, fd, st->st_size);
1513
1514 close(fd);
1515 return 0;
1516}
1517
1518static const char *maybe_add_root(const char *fname, char *buf)
1519{
1520 if (root && strncmp(fname, root, strlen(root))) {
1521 strcpy(buf, root);
1522 strncat(buf, fname, __PAX_UTILS_PATH_MAX - strlen(root) - 1);
1523 fname = buf;
1524 }
1525 return fname;
951} 1526}
952 1527
953/* scan a directory for ET_EXEC files and print when we find one */ 1528/* scan a directory for ET_EXEC files and print when we find one */
954static void scanelf_dir(const char *path) 1529static int scanelf_dir(const char *path)
955{ 1530{
956 register DIR *dir; 1531 register DIR *dir;
957 register struct dirent *dentry; 1532 register struct dirent *dentry;
958 struct stat st_top, st; 1533 struct stat st_top, st;
959 char buf[_POSIX_PATH_MAX]; 1534 char buf[__PAX_UTILS_PATH_MAX];
1535 char _path[__PAX_UTILS_PATH_MAX];
960 size_t pathlen = 0, len = 0; 1536 size_t pathlen = 0, len = 0;
1537 int ret = 0;
1538
1539 path = maybe_add_root(path, _path);
961 1540
962 /* make sure path exists */ 1541 /* make sure path exists */
963 if (lstat(path, &st_top) == -1) { 1542 if (lstat(path, &st_top) == -1) {
964 if (be_verbose > 2) printf("%s: does not exist\n", path); 1543 if (be_verbose > 2) printf("%s: does not exist\n", path);
965 return; 1544 return 1;
966 } 1545 }
967 1546
968 /* ok, if it isn't a directory, assume we can open it */ 1547 /* ok, if it isn't a directory, assume we can open it */
969 if (!S_ISDIR(st_top.st_mode)) { 1548 if (!S_ISDIR(st_top.st_mode)) {
970 scanelf_file(path); 1549 return scanelf_file(path, &st_top);
971 return;
972 } 1550 }
973 1551
974 /* now scan the dir looking for fun stuff */ 1552 /* now scan the dir looking for fun stuff */
975 if ((dir = opendir(path)) == NULL) { 1553 if ((dir = opendir(path)) == NULL) {
976 warnf("could not opendir %s: %s", path, strerror(errno)); 1554 warnf("could not opendir %s: %s", path, strerror(errno));
977 return; 1555 return 1;
978 } 1556 }
979 if (be_verbose) printf("%s: scanning dir\n", path); 1557 if (be_verbose > 1) printf("%s: scanning dir\n", path);
980 1558
981 pathlen = strlen(path); 1559 pathlen = strlen(path);
982 while ((dentry = readdir(dir))) { 1560 while ((dentry = readdir(dir))) {
983 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1561 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
984 continue; 1562 continue;
986 if (len >= sizeof(buf)) { 1564 if (len >= sizeof(buf)) {
987 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1565 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
988 (unsigned long)len, (unsigned long)sizeof(buf)); 1566 (unsigned long)len, (unsigned long)sizeof(buf));
989 continue; 1567 continue;
990 } 1568 }
991 sprintf(buf, "%s/%s", path, dentry->d_name); 1569 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
992 if (lstat(buf, &st) != -1) { 1570 if (lstat(buf, &st) != -1) {
993 if (S_ISREG(st.st_mode)) 1571 if (S_ISREG(st.st_mode))
994 scanelf_file(buf); 1572 ret = scanelf_file(buf, &st);
995 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1573 else if (dir_recurse && S_ISDIR(st.st_mode)) {
996 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1574 if (dir_crossmount || (st_top.st_dev == st.st_dev))
997 scanelf_dir(buf); 1575 ret = scanelf_dir(buf);
998 } 1576 }
999 } 1577 }
1000 } 1578 }
1001 closedir(dir); 1579 closedir(dir);
1580 return ret;
1002} 1581}
1003 1582
1004static int scanelf_from_file(char *filename) 1583static int scanelf_from_file(const char *filename)
1005{ 1584{
1006 FILE *fp = NULL; 1585 FILE *fp;
1007 char *p; 1586 char *p, *path;
1008 char path[_POSIX_PATH_MAX]; 1587 size_t len;
1588 int ret;
1009 1589
1010 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1590 if (strcmp(filename, "-") == 0)
1011 fp = stdin; 1591 fp = stdin;
1012 else if ((fp = fopen(filename, "r")) == NULL) 1592 else if ((fp = fopen(filename, "r")) == NULL)
1013 return 1; 1593 return 1;
1014 1594
1015 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1595 path = NULL;
1596 len = 0;
1597 ret = 0;
1598 while (getline(&path, &len, fp) != -1) {
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 }
1604 free(path);
1605
1021 if (fp != stdin) 1606 if (fp != stdin)
1022 fclose(fp); 1607 fclose(fp);
1608
1023 return 0; 1609 return ret;
1024} 1610}
1025 1611
1026static void load_ld_so_conf() 1612#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1613
1614static int load_ld_cache_config(int i, const char *fname)
1027{ 1615{
1028 FILE *fp = NULL; 1616 FILE *fp = NULL;
1029 char *p; 1617 char *p, *path;
1030 char path[_POSIX_PATH_MAX]; 1618 size_t len;
1031 int i = 0; 1619 char _fname[__PAX_UTILS_PATH_MAX];
1032 1620
1621 fname = maybe_add_root(fname, _fname);
1622
1033 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1623 if ((fp = fopen(fname, "r")) == NULL)
1034 return; 1624 return i;
1035 1625
1036 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1626 path = NULL;
1037 if (*path != '/') 1627 len = 0;
1038 continue; 1628 while (getline(&path, &len, fp) != -1) {
1039
1040 if ((p = strrchr(path, '\r')) != NULL) 1629 if ((p = strrchr(path, '\r')) != NULL)
1041 *p = 0; 1630 *p = 0;
1042 if ((p = strchr(path, '\n')) != NULL) 1631 if ((p = strchr(path, '\n')) != NULL)
1043 *p = 0; 1632 *p = 0;
1044 1633
1045 ldpaths[i++] = xstrdup(path); 1634 /* recursive includes of the same file will make this segfault. */
1635 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1636 glob_t gl;
1637 size_t x;
1638 char gpath[__PAX_UTILS_PATH_MAX];
1046 1639
1047 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1640 memset(gpath, 0, sizeof(gpath));
1048 break; 1641 if (root)
1642 strcpy(gpath, root);
1643
1644 if (path[8] != '/')
1645 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1646 else
1647 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1648
1649 if (glob(gpath, 0, NULL, &gl) == 0) {
1650 for (x = 0; x < gl.gl_pathc; ++x) {
1651 /* try to avoid direct loops */
1652 if (strcmp(gl.gl_pathv[x], fname) == 0)
1653 continue;
1654 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1655 }
1656 globfree(&gl);
1657 continue;
1658 }
1049 } 1659 }
1050 ldpaths[i] = NULL; 1660
1661 if (*path != '/')
1662 continue;
1663
1664 xarraypush(ldpaths, path, strlen(path));
1665 }
1666 free(path);
1051 1667
1052 fclose(fp); 1668 fclose(fp);
1669
1670 return i;
1053} 1671}
1672
1673#elif defined(__FreeBSD__) || defined(__DragonFly__)
1674
1675static int load_ld_cache_config(int i, const char *fname)
1676{
1677 FILE *fp = NULL;
1678 char *b = NULL, *p;
1679 struct elfhints_hdr hdr;
1680 char _fname[__PAX_UTILS_PATH_MAX];
1681
1682 fname = maybe_add_root(fname, _fname);
1683
1684 if ((fp = fopen(fname, "r")) == NULL)
1685 return i;
1686
1687 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1688 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1689 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1690 {
1691 fclose(fp);
1692 return i;
1693 }
1694
1695 b = xmalloc(hdr.dirlistlen + 1);
1696 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1697 fclose(fp);
1698 free(b);
1699 return i;
1700 }
1701
1702 while ((p = strsep(&b, ":"))) {
1703 if (*p == '\0')
1704 continue;
1705 xarraypush(ldpaths, p, strlen(p));
1706 }
1707
1708 free(b);
1709 fclose(fp);
1710 return i;
1711}
1712
1713#else
1714#ifdef __ELF__
1715#warning Cache config support not implemented for your target
1716#endif
1717static int load_ld_cache_config(int i, const char *fname)
1718{
1719 return 0;
1720}
1721#endif
1054 1722
1055/* scan /etc/ld.so.conf for paths */ 1723/* scan /etc/ld.so.conf for paths */
1056static void scanelf_ldpath() 1724static void scanelf_ldpath(void)
1057{ 1725{
1058 char scan_l, scan_ul, scan_ull; 1726 char scan_l, scan_ul, scan_ull;
1727 size_t n;
1728 const char *ldpath;
1059 int i = 0; 1729 int i = 0;
1060 1730
1061 if (!ldpaths[0]) 1731 if (array_cnt(ldpaths) == 0)
1062 err("Unable to load any paths from ld.so.conf"); 1732 err("Unable to load any paths from ld.so.conf");
1063 1733
1064 scan_l = scan_ul = scan_ull = 0; 1734 scan_l = scan_ul = scan_ull = 0;
1065 1735
1066 while (ldpaths[i]) { 1736 array_for_each(ldpaths, n, ldpath) {
1067 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1737 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
1068 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1738 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
1069 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1739 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
1070 scanelf_dir(ldpaths[i]); 1740 scanelf_dir(ldpath);
1071 ++i; 1741 ++i;
1072 } 1742 }
1073 1743
1074 if (!scan_l) scanelf_dir("/lib"); 1744 if (!scan_l) scanelf_dir("/lib");
1075 if (!scan_ul) scanelf_dir("/usr/lib"); 1745 if (!scan_ul) scanelf_dir("/usr/lib");
1076 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1746 if (!scan_ull) scanelf_dir("/usr/local/lib");
1077} 1747}
1078 1748
1079/* scan env PATH for paths */ 1749/* scan env PATH for paths */
1080static void scanelf_envpath() 1750static void scanelf_envpath(void)
1081{ 1751{
1082 char *path, *p; 1752 char *path, *p;
1083 1753
1084 path = getenv("PATH"); 1754 path = getenv("PATH");
1085 if (!path) 1755 if (!path)
1092 } 1762 }
1093 1763
1094 free(path); 1764 free(path);
1095} 1765}
1096 1766
1097 1767/* 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" 1768#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1100#define a_argument required_argument 1769#define a_argument required_argument
1101static struct option const long_opts[] = { 1770static struct option const long_opts[] = {
1102 {"path", no_argument, NULL, 'p'}, 1771 {"path", no_argument, NULL, 'p'},
1103 {"ldpath", no_argument, NULL, 'l'}, 1772 {"ldpath", no_argument, NULL, 'l'},
1773 {"root", a_argument, NULL, 128},
1104 {"recursive", no_argument, NULL, 'R'}, 1774 {"recursive", no_argument, NULL, 'R'},
1105 {"mount", no_argument, NULL, 'm'}, 1775 {"mount", no_argument, NULL, 'm'},
1106 {"symlink", no_argument, NULL, 'y'}, 1776 {"symlink", no_argument, NULL, 'y'},
1777 {"archives", no_argument, NULL, 'A'},
1778 {"ldcache", no_argument, NULL, 'L'},
1779 {"fix", no_argument, NULL, 'X'},
1780 {"setpax", a_argument, NULL, 'z'},
1107 {"pax", no_argument, NULL, 'x'}, 1781 {"pax", no_argument, NULL, 'x'},
1108 {"header", no_argument, NULL, 'e'}, 1782 {"header", no_argument, NULL, 'e'},
1109 {"textrel", no_argument, NULL, 't'}, 1783 {"textrel", no_argument, NULL, 't'},
1110 {"rpath", no_argument, NULL, 'r'}, 1784 {"rpath", no_argument, NULL, 'r'},
1111 {"needed", no_argument, NULL, 'n'}, 1785 {"needed", no_argument, NULL, 'n'},
1112 {"ldcache", no_argument, NULL, 'L'},
1113 {"interp", no_argument, NULL, 'i'}, 1786 {"interp", no_argument, NULL, 'i'},
1114 {"bind", no_argument, NULL, 'b'}, 1787 {"bind", no_argument, NULL, 'b'},
1115 {"soname", no_argument, NULL, 'S'}, 1788 {"soname", no_argument, NULL, 'S'},
1116 {"symbol", a_argument, NULL, 's'}, 1789 {"symbol", a_argument, NULL, 's'},
1790 {"section", a_argument, NULL, 'k'},
1117 {"lib", a_argument, NULL, 'N'}, 1791 {"lib", a_argument, NULL, 'N'},
1118 {"gmatch", no_argument, NULL, 'g'}, 1792 {"gmatch", no_argument, NULL, 'g'},
1119 {"textrels", no_argument, NULL, 'T'}, 1793 {"textrels", no_argument, NULL, 'T'},
1794 {"etype", a_argument, NULL, 'E'},
1795 {"bits", a_argument, NULL, 'M'},
1796 {"endian", no_argument, NULL, 'D'},
1797 {"osabi", no_argument, NULL, 'I'},
1798 {"eabi", no_argument, NULL, 'Y'},
1799 {"perms", a_argument, NULL, 'O'},
1800 {"size", no_argument, NULL, 'Z'},
1120 {"all", no_argument, NULL, 'a'}, 1801 {"all", no_argument, NULL, 'a'},
1121 {"quiet", no_argument, NULL, 'q'}, 1802 {"quiet", no_argument, NULL, 'q'},
1122 {"verbose", no_argument, NULL, 'v'}, 1803 {"verbose", no_argument, NULL, 'v'},
1123 {"format", a_argument, NULL, 'F'}, 1804 {"format", a_argument, NULL, 'F'},
1124 {"from", a_argument, NULL, 'f'}, 1805 {"from", a_argument, NULL, 'f'},
1125 {"file", a_argument, NULL, 'o'}, 1806 {"file", a_argument, NULL, 'o'},
1807 {"nocolor", no_argument, NULL, 'C'},
1126 {"nobanner", no_argument, NULL, 'B'}, 1808 {"nobanner", no_argument, NULL, 'B'},
1127 {"help", no_argument, NULL, 'h'}, 1809 {"help", no_argument, NULL, 'h'},
1128 {"version", no_argument, NULL, 'V'}, 1810 {"version", no_argument, NULL, 'V'},
1129 {NULL, no_argument, NULL, 0x0} 1811 {NULL, no_argument, NULL, 0x0}
1130}; 1812};
1131 1813
1132static const char *opts_help[] = { 1814static const char * const opts_help[] = {
1133 "Scan all directories in PATH environment", 1815 "Scan all directories in PATH environment",
1134 "Scan all directories in /etc/ld.so.conf", 1816 "Scan all directories in /etc/ld.so.conf",
1817 "Root directory (use with -l or -p)",
1135 "Scan directories recursively", 1818 "Scan directories recursively",
1136 "Don't recursively cross mount points", 1819 "Don't recursively cross mount points",
1137 "Don't scan symlinks\n", 1820 "Don't scan symlinks",
1821 "Scan archives (.a files)",
1822 "Utilize ld.so.cache information (use with -r/-n)",
1823 "Try and 'fix' bad things (use with -r/-e)",
1824 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1138 "Print PaX markings", 1825 "Print PaX markings",
1139 "Print GNU_STACK/PT_LOAD markings", 1826 "Print GNU_STACK/PT_LOAD markings",
1140 "Print TEXTREL information", 1827 "Print TEXTREL information",
1141 "Print RPATH information", 1828 "Print RPATH information",
1142 "Print NEEDED information", 1829 "Print NEEDED information",
1143 "Resolve NEEDED information (use with -n)",
1144 "Print INTERP information", 1830 "Print INTERP information",
1145 "Print BIND information", 1831 "Print BIND information",
1146 "Print SONAME information", 1832 "Print SONAME information",
1147 "Find a specified symbol", 1833 "Find a specified symbol",
1834 "Find a specified section",
1148 "Find a specified library", 1835 "Find a specified library",
1149 "Use strncmp to match libraries. (use with -N)", 1836 "Use regex matching rather than string compare (use with -s)",
1150 "Locate cause of TEXTREL", 1837 "Locate cause of TEXTREL",
1151 "Print all scanned info (-x -e -t -r -b)\n", 1838 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1839 "Print only ELF files matching numeric bits",
1840 "Print Endianness",
1841 "Print OSABI",
1842 "Print EABI (EM_ARM Only)",
1843 "Print only ELF files matching octal permissions",
1844 "Print ELF file size",
1845 "Print all useful/simple info\n",
1152 "Only output 'bad' things", 1846 "Only output 'bad' things",
1153 "Be verbose (can be specified more than once)", 1847 "Be verbose (can be specified more than once)",
1154 "Use specified format for output", 1848 "Use specified format for output",
1155 "Read input stream from a filename", 1849 "Read input stream from a filename",
1156 "Write output stream to a filename", 1850 "Write output stream to a filename",
1851 "Don't emit color in output",
1157 "Don't display the header", 1852 "Don't display the header",
1158 "Print this help and exit", 1853 "Print this help and exit",
1159 "Print version and exit", 1854 "Print version and exit",
1160 NULL 1855 NULL
1161}; 1856};
1163/* display usage and exit */ 1858/* display usage and exit */
1164static void usage(int status) 1859static void usage(int status)
1165{ 1860{
1166 unsigned long i; 1861 unsigned long i;
1167 printf("* Scan ELF binaries for stuff\n\n" 1862 printf("* Scan ELF binaries for stuff\n\n"
1168 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1863 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1169 printf("Options: -[%s]\n", PARSE_FLAGS); 1864 printf("Options: -[%s]\n", PARSE_FLAGS);
1170 for (i = 0; long_opts[i].name; ++i) 1865 for (i = 0; long_opts[i].name; ++i)
1171 if (long_opts[i].has_arg == no_argument) 1866 if (long_opts[i].has_arg == no_argument)
1172 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1867 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1868 long_opts[i].name, opts_help[i]);
1869 else if (long_opts[i].val > '~')
1870 printf(" --%-7s <arg> * %s\n",
1173 long_opts[i].name, opts_help[i]); 1871 long_opts[i].name, opts_help[i]);
1174 else 1872 else
1175 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1873 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1176 long_opts[i].name, opts_help[i]); 1874 long_opts[i].name, opts_help[i]);
1177 1875
1178 if (status != EXIT_SUCCESS) 1876 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); 1877 exit(status);
1192} 1878}
1193 1879
1194/* parse command line arguments and preform needed actions */ 1880/* parse command line arguments and preform needed actions */
1881#define do_pax_state(option, flag) \
1882 if (islower(option)) { \
1883 flags &= ~PF_##flag; \
1884 flags |= PF_NO##flag; \
1885 } else { \
1886 flags &= ~PF_NO##flag; \
1887 flags |= PF_##flag; \
1888 }
1195static void parseargs(int argc, char *argv[]) 1889static int parseargs(int argc, char *argv[])
1196{ 1890{
1197 int i; 1891 int i;
1198 char *from_file = NULL; 1892 const char *from_file = NULL;
1893 int ret = 0;
1199 1894
1200 opterr = 0; 1895 opterr = 0;
1201 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1896 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1202 switch (i) { 1897 switch (i) {
1203 1898
1207 VERSION, __FILE__, __DATE__, rcsid, argv0); 1902 VERSION, __FILE__, __DATE__, rcsid, argv0);
1208 exit(EXIT_SUCCESS); 1903 exit(EXIT_SUCCESS);
1209 break; 1904 break;
1210 case 'h': usage(EXIT_SUCCESS); break; 1905 case 'h': usage(EXIT_SUCCESS); break;
1211 case 'f': 1906 case 'f':
1212 if (from_file) err("Don't specify -f twice"); 1907 if (from_file) warn("You prob don't want to specify -f twice");
1213 from_file = xstrdup(optarg); 1908 from_file = optarg;
1909 break;
1910 case 'E':
1911 match_etypes = optarg;
1912 break;
1913 case 'M':
1914 match_bits = atoi(optarg);
1915 if (match_bits == 0) {
1916 if (strcmp(optarg, "ELFCLASS32") == 0)
1917 match_bits = 32;
1918 if (strcmp(optarg, "ELFCLASS64") == 0)
1919 match_bits = 64;
1920 }
1921 break;
1922 case 'O':
1923 if (sscanf(optarg, "%o", &match_perms) == -1)
1924 match_bits = 0;
1214 break; 1925 break;
1215 case 'o': { 1926 case 'o': {
1216 FILE *fp = NULL;
1217 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1927 if (freopen(optarg, "w", stdout) == NULL)
1218 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1928 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1219 SET_STDOUT(fp);
1220 break; 1929 break;
1221 } 1930 }
1222 1931 case 'k':
1932 xarraypush(find_section_arr, optarg, strlen(optarg));
1933 break;
1223 case 's': { 1934 case 's': {
1224 if (find_sym) warn("You prob don't want to specify -s twice"); 1935 if (find_sym) warn("You prob don't want to specify -s twice");
1225 find_sym = optarg; 1936 find_sym = optarg;
1226 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1227 sprintf(versioned_symname, "%s@", find_sym);
1228 break; 1937 break;
1229 } 1938 }
1230 case 'N': { 1939 case 'N':
1231 if (find_lib) warn("You prob don't want to specify -N twice"); 1940 xarraypush(find_lib_arr, optarg, strlen(optarg));
1232 find_lib = optarg;
1233 break; 1941 break;
1234 }
1235
1236 case 'F': { 1942 case 'F': {
1237 if (out_format) warn("You prob don't want to specify -F twice"); 1943 if (out_format) warn("You prob don't want to specify -F twice");
1238 out_format = optarg; 1944 out_format = optarg;
1239 break; 1945 break;
1240 } 1946 }
1947 case 'z': {
1948 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1949 size_t x;
1241 1950
1242 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */ 1951 for (x = 0; x < strlen(optarg); x++) {
1952 switch (optarg[x]) {
1953 case 'p':
1954 case 'P':
1955 do_pax_state(optarg[x], PAGEEXEC);
1956 break;
1957 case 's':
1958 case 'S':
1959 do_pax_state(optarg[x], SEGMEXEC);
1960 break;
1961 case 'm':
1962 case 'M':
1963 do_pax_state(optarg[x], MPROTECT);
1964 break;
1965 case 'e':
1966 case 'E':
1967 do_pax_state(optarg[x], EMUTRAMP);
1968 break;
1969 case 'r':
1970 case 'R':
1971 do_pax_state(optarg[x], RANDMMAP);
1972 break;
1973 case 'x':
1974 case 'X':
1975 do_pax_state(optarg[x], RANDEXEC);
1976 break;
1977 default:
1978 break;
1979 }
1980 }
1981 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1982 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1983 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1984 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1985 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1986 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1987 setpax = flags;
1988 break;
1989 }
1990 case 'Z': show_size = 1; break;
1991 case 'g': g_match = 1; break;
1243 case 'L': printcache = 1; break; 1992 case 'L': use_ldcache = 1; break;
1244 case 'y': scan_symlink = 0; break; 1993 case 'y': scan_symlink = 0; break;
1994 case 'A': scan_archives = 1; break;
1995 case 'C': color_init(true); break;
1245 case 'B': show_banner = 0; break; 1996 case 'B': show_banner = 0; break;
1246 case 'l': scan_ldpath = 1; break; 1997 case 'l': scan_ldpath = 1; break;
1247 case 'p': scan_envpath = 1; break; 1998 case 'p': scan_envpath = 1; break;
1248 case 'R': dir_recurse = 1; break; 1999 case 'R': dir_recurse = 1; break;
1249 case 'm': dir_crossmount = 0; break; 2000 case 'm': dir_crossmount = 0; break;
2001 case 'X': ++fix_elf; break;
1250 case 'x': show_pax = 1; break; 2002 case 'x': show_pax = 1; break;
1251 case 'e': show_phdr = 1; break; 2003 case 'e': show_phdr = 1; break;
1252 case 't': show_textrel = 1; break; 2004 case 't': show_textrel = 1; break;
1253 case 'r': show_rpath = 1; break; 2005 case 'r': show_rpath = 1; break;
1254 case 'n': show_needed = 1; break; 2006 case 'n': show_needed = 1; break;
1256 case 'b': show_bind = 1; break; 2008 case 'b': show_bind = 1; break;
1257 case 'S': show_soname = 1; break; 2009 case 'S': show_soname = 1; break;
1258 case 'T': show_textrels = 1; break; 2010 case 'T': show_textrels = 1; break;
1259 case 'q': be_quiet = 1; break; 2011 case 'q': be_quiet = 1; break;
1260 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2012 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1261 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 2013 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1262 2014 case 'D': show_endian = 1; break;
2015 case 'I': show_osabi = 1; break;
2016 case 'Y': show_eabi = 1; break;
2017 case 128:
2018 root = optarg;
2019 break;
1263 case ':': 2020 case ':':
1264 err("Option missing parameter\n"); 2021 err("Option '%c' is missing parameter", optopt);
1265 case '?': 2022 case '?':
1266 err("Unknown option\n"); 2023 err("Unknown option '%c' or argument missing", optopt);
1267 default: 2024 default:
1268 err("Unhandled option '%c'", i); 2025 err("Unhandled option '%c'; please report this", i);
1269 }
1270 } 2026 }
1271 2027 }
2028 if (show_textrels && be_verbose)
2029 has_objdump = bin_in_path("objdump");
2030 /* flatten arrays for display */
2031 if (array_cnt(find_lib_arr))
2032 find_lib = array_flatten_str(find_lib_arr);
2033 if (array_cnt(find_section_arr))
2034 find_section = array_flatten_str(find_section_arr);
1272 /* let the format option override all other options */ 2035 /* let the format option override all other options */
1273 if (out_format) { 2036 if (out_format) {
1274 show_pax = show_phdr = show_textrel = show_rpath = \ 2037 show_pax = show_phdr = show_textrel = show_rpath = \
1275 show_needed = show_interp = show_bind = show_soname = \ 2038 show_needed = show_interp = show_bind = show_soname = \
1276 show_textrels = 0; 2039 show_textrels = show_perms = show_endian = show_size = \
2040 show_osabi = show_eabi = 0;
1277 for (i = 0; out_format[i]; ++i) { 2041 for (i = 0; out_format[i]; ++i) {
1278 if (!IS_MODIFIER(out_format[i])) continue; 2042 if (!IS_MODIFIER(out_format[i])) continue;
1279 2043
1280 switch (out_format[++i]) { 2044 switch (out_format[++i]) {
2045 case '+': break;
1281 case '%': break; 2046 case '%': break;
1282 case '#': break; 2047 case '#': break;
1283 case 'F': break; 2048 case 'F': break;
1284 case 'p': break; 2049 case 'p': break;
1285 case 'f': break; 2050 case 'f': break;
2051 case 'k': break;
1286 case 's': break; 2052 case 's': break;
1287 case 'N': break; 2053 case 'N': break;
1288 case 'o': break; 2054 case 'o': break;
2055 case 'a': break;
2056 case 'M': break;
2057 case 'Z': show_size = 1; break;
2058 case 'D': show_endian = 1; break;
2059 case 'I': show_osabi = 1; break;
2060 case 'Y': show_eabi = 1; break;
2061 case 'O': show_perms = 1; break;
1289 case 'x': show_pax = 1; break; 2062 case 'x': show_pax = 1; break;
1290 case 'e': show_phdr = 1; break; 2063 case 'e': show_phdr = 1; break;
1291 case 't': show_textrel = 1; break; 2064 case 't': show_textrel = 1; break;
1292 case 'r': show_rpath = 1; break; 2065 case 'r': show_rpath = 1; break;
1293 case 'n': show_needed = 1; break; 2066 case 'n': show_needed = 1; break;
1294 case 'i': show_interp = 1; break; 2067 case 'i': show_interp = 1; break;
1295 case 'b': show_bind = 1; break; 2068 case 'b': show_bind = 1; break;
1296 case 'S': show_soname = 1; break; 2069 case 'S': show_soname = 1; break;
1297 case 'T': show_textrels = 1; break; 2070 case 'T': show_textrels = 1; break;
1298 default: 2071 default:
1299 err("Invalid format specifier '%c' (byte %i)", 2072 err("Invalid format specifier '%c' (byte %i)",
1300 out_format[i], i+1); 2073 out_format[i], i+1);
1301 } 2074 }
1302 } 2075 }
1303 2076
1304 /* construct our default format */ 2077 /* construct our default format */
1305 } else { 2078 } else {
1306 size_t fmt_len = 30; 2079 size_t fmt_len = 30;
1307 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2080 out_format = xmalloc(sizeof(char) * fmt_len);
2081 *out_format = '\0';
1308 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2082 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1309 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2083 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2084 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2085 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2086 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2087 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2088 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1310 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2089 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1311 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2090 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1312 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2091 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1313 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2092 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1314 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2093 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1315 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2094 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1316 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2095 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1317 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2096 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1318 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2097 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2098 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1319 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2099 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1320 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2100 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1321 } 2101 }
1322 if (be_verbose > 2) printf("Format: %s\n", out_format); 2102 if (be_verbose > 2) printf("Format: %s\n", out_format);
1323 2103
1324 /* now lets actually do the scanning */ 2104 /* now lets actually do the scanning */
1325 if (scan_ldpath || (show_rpath && be_quiet)) 2105 if (scan_ldpath || use_ldcache)
1326 load_ld_so_conf(); 2106 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1327 if (scan_ldpath) scanelf_ldpath(); 2107 if (scan_ldpath) scanelf_ldpath();
1328 if (scan_envpath) scanelf_envpath(); 2108 if (scan_envpath) scanelf_envpath();
2109 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2110 from_file = "-";
1329 if (from_file) { 2111 if (from_file) {
1330 scanelf_from_file(from_file); 2112 scanelf_from_file(from_file);
1331 free(from_file);
1332 from_file = *argv; 2113 from_file = *argv;
1333 } 2114 }
1334 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2115 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1335 err("Nothing to scan !?"); 2116 err("Nothing to scan !?");
1336 while (optind < argc) { 2117 while (optind < argc) {
1337 search_path = argv[optind++]; 2118 search_path = argv[optind++];
1338 scanelf_dir(search_path); 2119 ret = scanelf_dir(search_path);
1339 } 2120 }
1340 2121
1341 /* clean up */ 2122 /* clean up */
1342 if (versioned_symname) free(versioned_symname);
1343 for (i = 0; ldpaths[i]; ++i)
1344 free(ldpaths[i]); 2123 xarrayfree(ldpaths);
2124 xarrayfree(find_lib_arr);
2125 xarrayfree(find_section_arr);
2126 free(find_lib);
2127 free(find_section);
1345 2128
1346 if (ldcache != 0) 2129 if (ldcache != 0)
1347 munmap(ldcache, ldcache_size); 2130 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; 2131 return ret;
1358} 2132}
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 2133
1369 new_len = strlen(*dst) + strlen(src); 2134static 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{ 2135{
1384 static char my_app[2]; 2136 const char *delims = " \t\n";
1385 my_app[0] = append; 2137 char **envvals = NULL;
1386 my_app[1] = '\0'; 2138 char *env, *s;
1387 xstrcat(dst, my_app, curr_len); 2139 int nentry;
1388}
1389 2140
2141 if ((env = getenv(envvar)) == NULL)
2142 return NULL;
1390 2143
2144 env = xstrdup(env);
2145 if (env == NULL)
2146 return NULL;
2147
2148 s = strtok(env, delims);
2149 if (s == NULL) {
2150 free(env);
2151 return NULL;
2152 }
2153
2154 nentry = 0;
2155 while (s != NULL) {
2156 ++nentry;
2157 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2158 envvals[nentry-1] = s;
2159 s = strtok(NULL, delims);
2160 }
2161 envvals[nentry] = NULL;
2162
2163 /* don't want to free(env) as it contains the memory that backs
2164 * the envvals array of strings */
2165 return envvals;
2166}
2167
2168static void parseenv(void)
2169{
2170 color_init(false);
2171 qa_textrels = get_split_env("QA_TEXTRELS");
2172 qa_execstack = get_split_env("QA_EXECSTACK");
2173 qa_wx_load = get_split_env("QA_WX_LOAD");
2174}
2175
2176#ifdef __PAX_UTILS_CLEANUP
2177static void cleanup(void)
2178{
2179 free(out_format);
2180 free(qa_textrels);
2181 free(qa_execstack);
2182 free(qa_wx_load);
2183}
2184#endif
1391 2185
1392int main(int argc, char *argv[]) 2186int main(int argc, char *argv[])
1393{ 2187{
2188 int ret;
1394 if (argc < 2) 2189 if (argc < 2)
1395 usage(EXIT_FAILURE); 2190 usage(EXIT_FAILURE);
2191 parseenv();
1396 parseargs(argc, argv); 2192 ret = parseargs(argc, argv);
1397 fclose(stdout); 2193 fclose(stdout);
1398#ifdef __BOUNDS_CHECKING_ON 2194#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()"); 2195 cleanup();
2196 warn("The calls to add/delete heap should be off:\n"
2197 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2198 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1400#endif 2199#endif
1401 return EXIT_SUCCESS; 2200 return ret;
1402} 2201}
2202
2203/* Match filename against entries in matchlist, return TRUE
2204 * if the file is listed */
2205static int file_matches_list(const char *filename, char **matchlist)
2206{
2207 char **file;
2208 char *match;
2209 char buf[__PAX_UTILS_PATH_MAX];
2210
2211 if (matchlist == NULL)
2212 return 0;
2213
2214 for (file = matchlist; *file != NULL; file++) {
2215 if (search_path) {
2216 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2217 match = buf;
2218 } else {
2219 match = *file;
2220 }
2221 if (fnmatch(match, filename, 0) == 0)
2222 return 1;
2223 }
2224 return 0;
2225}

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