/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 Revision 1.221
1/* 1/*
2 * Copyright 2003-2005 Gentoo Foundation 2 * Copyright 2003-2007 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.88 2005/09/30 03:30:54 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.221 2010/12/08 01:16:01 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 1.221 2010/12/08 01:16:01 vapier Exp $";
11#include <stdlib.h> 11const char argv0[] = "scanelf";
12#include <sys/types.h> 12
13#include <libgen.h>
14#include <limits.h>
15#define __USE_GNU
16#include <string.h>
17#include <errno.h>
18#include <unistd.h>
19#include <sys/stat.h>
20#include <dirent.h>
21#include <getopt.h>
22#include <assert.h>
23#include "paxelf.h" 13#include "paxinc.h"
24 14
25static const char *rcsid = "$Id: scanelf.c,v 1.88 2005/09/30 03:30:54 vapier Exp $";
26#define argv0 "scanelf"
27
28#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
29
30
31 16
32/* prototypes */ 17/* prototypes */
33static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
19static int scanelf_elfobj(elfobj *elf);
20static int scanelf_elf(const char *filename, int fd, size_t len);
21static int scanelf_archive(const char *filename, int fd, size_t len);
22static int scanelf_file(const char *filename, const struct stat *st_cache);
34static void scanelf_dir(const char *path); 23static int scanelf_dir(const char *path);
35static void scanelf_ldpath(); 24static void scanelf_ldpath(void);
36static void scanelf_envpath(); 25static void scanelf_envpath(void);
37static void usage(int status); 26static void usage(int status);
27static char **get_split_env(const char *envvar);
28static void parseenv(void);
38static void parseargs(int argc, char *argv[]); 29static int parseargs(int argc, char *argv[]);
39static char *xstrdup(const char *s);
40static void *xmalloc(size_t size);
41static void xstrcat(char **dst, const char *src, size_t *curr_len);
42static inline void xchrcat(char **dst, const char append, size_t *curr_len);
43 30
44/* variables to control behavior */ 31/* variables to control behavior */
32static char match_etypes[126] = "";
45static char *ldpaths[256]; 33static char *ldpaths[256];
46static char scan_ldpath = 0; 34static char scan_ldpath = 0;
47static char scan_envpath = 0; 35static char scan_envpath = 0;
48static char scan_symlink = 1; 36static char scan_symlink = 1;
37static char scan_archives = 0;
49static char dir_recurse = 0; 38static char dir_recurse = 0;
50static char dir_crossmount = 1; 39static char dir_crossmount = 1;
51static char show_pax = 0; 40static char show_pax = 0;
41static char show_perms = 0;
42static char show_size = 0;
52static char show_phdr = 0; 43static char show_phdr = 0;
53static char show_textrel = 0; 44static char show_textrel = 0;
54static char show_rpath = 0; 45static char show_rpath = 0;
55static char show_needed = 0; 46static char show_needed = 0;
56static char show_interp = 0; 47static char show_interp = 0;
57static char show_bind = 0; 48static char show_bind = 0;
58static char show_soname = 0; 49static char show_soname = 0;
59static char show_textrels = 0; 50static char show_textrels = 0;
60static char show_banner = 1; 51static char show_banner = 1;
52static char show_endian = 0;
53static char show_osabi = 0;
54static char show_eabi = 0;
61static char be_quiet = 0; 55static char be_quiet = 0;
62static char be_verbose = 0; 56static char be_verbose = 0;
63static char be_wewy_wewy_quiet = 0; 57static char be_wewy_wewy_quiet = 0;
64static char *find_sym = NULL, *versioned_symname = NULL; 58static char be_semi_verbose = 0;
59static char *find_sym = NULL;
65static char *find_lib = NULL; 60static char *find_lib = NULL;
61static char *find_section = NULL;
66static char *out_format = NULL; 62static char *out_format = NULL;
67static char *search_path = NULL; 63static char *search_path = NULL;
64static char fix_elf = 0;
68static char gmatch = 0; 65static char g_match = 0;
66static char use_ldcache = 0;
69 67
68static char **qa_textrels = NULL;
69static char **qa_execstack = NULL;
70static char **qa_wx_load = NULL;
71
72static int match_bits = 0;
73static unsigned int match_perms = 0;
74static void *ldcache = NULL;
75static size_t ldcache_size = 0;
76static unsigned long setpax = 0UL;
77
78static int has_objdump = 0;
79
80/* find the path to a file by name */
81static char *which(const char *fname)
82{
83 static char fullpath[__PAX_UTILS_PATH_MAX];
84 char *path, *p;
85
86 path = getenv("PATH");
87 if (!path)
88 return NULL;
89
90 path = xstrdup(path);
91 while ((p = strrchr(path, ':')) != NULL) {
92 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
93 *p = 0;
94 if (access(fullpath, R_OK) != -1) {
95 free(path);
96 return fullpath;
97 }
98 }
99 free(path);
100 return NULL;
101}
102
103/* 1 on failure. 0 otherwise */
104static int rematch(const char *regex, const char *match, int cflags)
105{
106 regex_t preg;
107 int ret;
108
109 if ((match == NULL) || (regex == NULL))
110 return EXIT_FAILURE;
111
112 if ((ret = regcomp(&preg, regex, cflags))) {
113 char err[256];
114
115 if (regerror(ret, &preg, err, sizeof(err)))
116 fprintf(stderr, "regcomp failed: %s", err);
117 else
118 fprintf(stderr, "regcomp failed");
119
120 return EXIT_FAILURE;
121 }
122 ret = regexec(&preg, match, 0, NULL, 0);
123 regfree(&preg);
124
125 return ret;
126}
70 127
71/* sub-funcs for scanelf_file() */ 128/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) 129static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{ 130{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */ 131 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
132
133 /* debug sections */
134 void *symtab = elf_findsecbyname(elf, ".symtab");
135 void *strtab = elf_findsecbyname(elf, ".strtab");
136 /* runtime sections */
137 void *dynsym = elf_findsecbyname(elf, ".dynsym");
138 void *dynstr = elf_findsecbyname(elf, ".dynstr");
139
75#define GET_SYMTABS(B) \ 140#define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \ 141 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
78 /* debug sections */ \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
81 /* runtime sections */ \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
84 if (symtab && dynsym) { \ 142 if (symtab && dynsym) { \
143 Elf ## B ## _Shdr *esymtab = symtab; \
144 Elf ## B ## _Shdr *edynsym = dynsym; \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ 145 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
86 } else { \ 146 } else \
87 *sym = (void*)(symtab ? symtab : dynsym); \ 147 *sym = symtab ? symtab : dynsym; \
88 } \
89 if (strtab && dynstr) { \ 148 if (strtab && dynstr) { \
149 Elf ## B ## _Shdr *estrtab = strtab; \
150 Elf ## B ## _Shdr *edynstr = dynstr; \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ 151 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
91 } else { \ 152 } else \
92 *tab = (void*)(strtab ? strtab : dynstr); \ 153 *tab = strtab ? strtab : dynstr; \
93 } \
94 } 154 }
95 GET_SYMTABS(32) 155 GET_SYMTABS(32)
96 GET_SYMTABS(64) 156 GET_SYMTABS(64)
97} 157}
158
98static char *scanelf_file_pax(elfobj *elf, char *found_pax) 159static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{ 160{
100 static char *paxflags;
101 static char ret[7]; 161 static char ret[7];
102 unsigned long i, shown; 162 unsigned long i, shown;
103 163
104 if (!show_pax) return NULL; 164 if (!show_pax) return NULL;
105 165
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 172 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 173 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 174 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 175 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \ 176 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 177 if (fix_elf && setpax) { \
178 /* set the paxctl flags */ \
179 ESET(phdr[i].p_flags, setpax); \
180 } \
181 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
118 continue; \ 182 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 183 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \ 184 *found_pax = 1; \
121 ++shown; \ 185 ++shown; \
122 break; \ 186 break; \
124 } 188 }
125 SHOW_PAX(32) 189 SHOW_PAX(32)
126 SHOW_PAX(64) 190 SHOW_PAX(64)
127 } 191 }
128 192
193 if (fix_elf && setpax) {
194 /* set the chpax settings */
195 if (elf->elf_class == ELFCLASS32) {
196 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
197 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
198 } else {
199 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
200 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
201 }
202 }
203
129 /* fall back to EI_PAX if no PT_PAX was found */ 204 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) { 205 if (!*ret) {
206 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 207 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 208 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1; 209 *found_pax = 1;
134 return paxflags; 210 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 } 211 }
136 strncpy(ret, paxflags, sizeof(ret)); 212 strncpy(ret, paxflags, sizeof(ret));
137 } 213 }
138 214
139 if (be_quiet && !shown) 215 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL; 216 return NULL;
217 else
141 return ret; 218 return ret;
142
143} 219}
220
144static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) 221static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145{ 222{
146 static char ret[12]; 223 static char ret[12];
147 char *found; 224 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load; 225 unsigned long i, shown, multi_stack, multi_relro, multi_load;
226 int max_pt_load;
150 227
151 if (!show_phdr) return NULL; 228 if (!show_phdr) return NULL;
152 229
153 memcpy(ret, "--- --- ---\0", 12); 230 memcpy(ret, "--- --- ---\0", 12);
154 231
155 shown = 0; 232 shown = 0;
156 multi_stack = multi_relro = multi_load = 0; 233 multi_stack = multi_relro = multi_load = 0;
234 max_pt_load = elf_max_pt_load(elf);
157 235
158 if (elf->phdr) { 236#define NOTE_GNU_STACK ".note.GNU-stack"
159#define SHOW_PHDR(B) \ 237#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \ 238 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 239 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
240 Elf ## B ## _Off offset; \
241 uint32_t flags, check_flags; \
242 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 243 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 244 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 245 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
246 if (multi_stack++) \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ 247 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
248 if (file_matches_list(elf->filename, qa_execstack)) \
249 continue; \
167 found = found_phdr; \ 250 found = found_phdr; \
168 off = 0; \ 251 offset = 0; \
169 check_flags = PF_X; \ 252 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ 253 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
254 if (multi_relro++) \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ 255 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \ 256 found = found_relro; \
173 off = 4; \ 257 offset = 4; \
174 check_flags = PF_X; \ 258 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \ 259 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ 260 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
261 if (multi_load++ > max_pt_load) \
262 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
263 if (file_matches_list(elf->filename, qa_wx_load)) \
264 continue; \
177 found = found_load; \ 265 found = found_load; \
178 off = 8; \ 266 offset = 8; \
179 check_flags = PF_W|PF_X; \ 267 check_flags = PF_W|PF_X; \
180 } else \ 268 } else \
181 continue; \ 269 continue; \
182 flags = EGET(phdr[i].p_flags); \ 270 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \ 271 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \ 272 continue; \
273 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
274 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
275 ret[3] = ret[7] = '!'; \
276 flags = EGET(phdr[i].p_flags); \
277 } \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \ 278 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \ 279 *found = 1; \
187 ++shown; \ 280 ++shown; \
281 } \
282 } else if (elf->shdr != NULL) { \
283 /* no program headers which means this is prob an object file */ \
284 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
285 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
286 char *str; \
287 if ((void*)strtbl > elf->data_end) \
288 goto skip_this_shdr##B; \
289 check_flags = SHF_WRITE|SHF_EXECINSTR; \
290 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
291 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
292 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
293 str = elf->data + offset; \
294 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
295 if (!strcmp(str, NOTE_GNU_STACK)) { \
296 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
297 flags = EGET(shdr[i].sh_flags); \
298 if (be_quiet && ((flags & check_flags) != check_flags)) \
299 continue; \
300 ++*found_phdr; \
301 shown = 1; \
302 if (flags & SHF_WRITE) ret[0] = 'W'; \
303 if (flags & SHF_ALLOC) ret[1] = 'A'; \
304 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
305 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
306 break; \
307 } \
308 } \
309 skip_this_shdr##B: \
310 if (!multi_stack) { \
311 if (file_matches_list(elf->filename, qa_execstack)) \
312 return NULL; \
313 *found_phdr = 1; \
314 shown = 1; \
315 memcpy(ret, "!WX", 3); \
316 } \
188 } \ 317 } \
189 } 318 }
190 SHOW_PHDR(32) 319 SHOW_PHDR(32)
191 SHOW_PHDR(64) 320 SHOW_PHDR(64)
192 }
193 321
194 if (be_quiet && !shown) 322 if (be_wewy_wewy_quiet || (be_quiet && !shown))
195 return NULL; 323 return NULL;
196 else 324 else
197 return ret; 325 return ret;
198} 326}
327
328/*
329 * See if this ELF contains a DT_TEXTREL tag in any of its
330 * PT_DYNAMIC sections.
331 */
199static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 332static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200{ 333{
201 static char ret[] = "TEXTREL"; 334 static const char *ret = "TEXTREL";
202 unsigned long i; 335 unsigned long i;
203 336
204 if (!show_textrel && !show_textrels) return NULL; 337 if (!show_textrel && !show_textrels) return NULL;
338
339 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
205 340
206 if (elf->phdr) { 341 if (elf->phdr) {
207#define SHOW_TEXTREL(B) \ 342#define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \ 343 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \ 344 Elf ## B ## _Dyn *dyn; \
210 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 345 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
211 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 346 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
212 Elf ## B ## _Off offset; \ 347 Elf ## B ## _Off offset; \
213 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 348 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
214 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 349 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
215 offset = EGET(phdr[i].p_offset); \ 350 offset = EGET(phdr[i].p_offset); \
216 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 351 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
217 dyn = DYN ## B (elf->data + offset); \ 352 dyn = DYN ## B (elf->vdata + offset); \
218 while (EGET(dyn->d_tag) != DT_NULL) { \ 353 while (EGET(dyn->d_tag) != DT_NULL) { \
219 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 354 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
220 *found_textrel = 1; \ 355 *found_textrel = 1; \
221 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 356 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
222 return (be_wewy_wewy_quiet ? NULL : ret); \ 357 return (be_wewy_wewy_quiet ? NULL : ret); \
229 } 364 }
230 365
231 if (be_quiet || be_wewy_wewy_quiet) 366 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL; 367 return NULL;
233 else 368 else
234 return (char *)" - "; 369 return " - ";
235} 370}
371
372/*
373 * Scan the .text section to see if there are any relocations in it.
374 * Should rewrite this to check PT_LOAD sections that are marked
375 * Executable rather than the section named '.text'.
376 */
236static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) 377static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237{ 378{
238 unsigned long s, r, rmax; 379 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void; 380 void *symtab_void, *strtab_void, *text_void;
240 381
261 Elf ## B ## _Rela *rela; \ 402 Elf ## B ## _Rela *rela; \
262 /* search the section headers for relocations */ \ 403 /* search the section headers for relocations */ \
263 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ 404 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
264 uint32_t sh_type = EGET(shdr[s].sh_type); \ 405 uint32_t sh_type = EGET(shdr[s].sh_type); \
265 if (sh_type == SHT_REL) { \ 406 if (sh_type == SHT_REL) { \
266 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ 407 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
267 rela = NULL; \ 408 rela = NULL; \
268 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ 409 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
269 } else if (sh_type == SHT_RELA) { \ 410 } else if (sh_type == SHT_RELA) { \
270 rel = NULL; \ 411 rel = NULL; \
271 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ 412 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
272 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ 413 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
273 } else \ 414 } else \
274 continue; \ 415 continue; \
275 /* now see if any of the relocs are in the .text */ \ 416 /* now see if any of the relocs are in the .text */ \
276 for (r = 0; r < rmax; ++r) { \ 417 for (r = 0; r < rmax; ++r) { \
291 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ 432 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
292 if (be_verbose <= 2) continue; \ 433 if (be_verbose <= 2) continue; \
293 } else \ 434 } else \
294 *found_textrels = 1; \ 435 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \ 436 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 437 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
438 if ((void*)sym > elf->data_end) { \
439 warn("%s: corrupt ELF symbol", elf->filename); \
440 continue; \
441 } \
297 sym_max = ELF ## B ## _R_SYM(r_info); \ 442 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ 443 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \ 444 sym += sym_max; \
300 else \ 445 else \
301 sym = NULL; \ 446 sym = NULL; \
302 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 447 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
303 /* show the raw details about this reloc */ \ 448 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \ 449 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \ 450 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ 451 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
307 else \ 452 else \
308 printf("(memory/fake?)"); \ 453 printf("(memory/data?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \ 454 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \ 455 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 456 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
312 func = NULL; \ 457 func = NULL; \
313 offset_tmp = 0; \ 458 offset_tmp = 0; \
314 while (sym_max--) { \ 459 while (sym_max--) { \
315 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ 460 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
316 func = sym; \ 461 func = sym; \
317 offset_tmp = EGET(sym->st_value); \ 462 offset_tmp = EGET(sym->st_value); \
318 } \ 463 } \
319 ++sym; \ 464 ++sym; \
320 } \ 465 } \
321 printf(" in "); \ 466 printf(" in "); \
322 if (func && func->st_name) \ 467 if (func && func->st_name) { \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ 468 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
469 if (r_offset > EGET(func->st_size)) \
470 printf("(optimized out: previous %s)", func_name); \
324 else \ 471 else \
325 printf("(NULL: fake?)"); \ 472 printf("%s", func_name); \
473 } else \
474 printf("(optimized out)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ 475 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
476 if (be_verbose && has_objdump) { \
477 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
478 char *sysbuf; \
479 size_t syslen; \
480 int sysret; \
481 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"; \
482 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
483 sysbuf = xmalloc(syslen); \
484 if (end_addr < r_offset) \
485 /* not uncommon when things are optimized out */ \
486 end_addr = r_offset + 0x100; \
487 snprintf(sysbuf, syslen, sysfmt, \
488 (unsigned long)offset_tmp, \
489 (unsigned long)end_addr, \
490 elf->filename, \
491 (unsigned long)r_offset); \
492 fflush(stdout); \
493 sysret = system(sysbuf); \
494 fflush(stdout); \
495 free(sysbuf); \
496 } \
327 } \ 497 } \
328 } } 498 } }
329 SHOW_TEXTRELS(32) 499 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64) 500 SHOW_TEXTRELS(64)
331 } 501 }
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); 503 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334 504
335 return NULL; 505 return NULL;
336} 506}
337 507
338static void rpath_security_checks(elfobj *, char *); 508static void rpath_security_checks(elfobj *, char *, const char *);
339static void rpath_security_checks(elfobj *elf, char *item) { 509static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
510{
340 struct stat st; 511 struct stat st;
341 switch (*item) { 512 switch (*item) {
513 case '/': break;
342 case 0: 514 case '.':
343 warnf("Security problem NULL RPATH in %s", elf->filename); 515 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
344 break; 516 break;
345 case '/': break; 517 case ':':
518 case '\0':
519 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
520 break;
346 case '$': 521 case '$':
347 if (fstat(elf->fd, &st) != -1) 522 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) 523 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
349 warnf("Security problem with RPATH='%s' in %s with mode set of %o", 524 warnf("Security problem with %s='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777); 525 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
351 break; 526 break;
352 default: 527 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); 528 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
354 break; 529 break;
355 } 530 }
356} 531}
357static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 532static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358{ 533{
375 Elf ## B ## _Off offset; \ 550 Elf ## B ## _Off offset; \
376 Elf ## B ## _Xword word; \ 551 Elf ## B ## _Xword word; \
377 /* Scan all the program headers */ \ 552 /* Scan all the program headers */ \
378 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 553 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
379 /* Just scan dynamic headers */ \ 554 /* Just scan dynamic headers */ \
380 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 555 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
381 offset = EGET(phdr[i].p_offset); \ 556 offset = EGET(phdr[i].p_offset); \
382 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 557 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
383 /* Just scan dynamic RPATH/RUNPATH headers */ \ 558 /* Just scan dynamic RPATH/RUNPATH headers */ \
384 dyn = DYN ## B (elf->data + offset); \ 559 dyn = DYN ## B (elf->vdata + offset); \
385 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ 560 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
386 if (word == DT_RPATH) { \ 561 if (word == DT_RPATH) { \
387 r = &rpath; \ 562 r = &rpath; \
388 } else if (word == DT_RUNPATH) { \ 563 } else if (word == DT_RUNPATH) { \
389 r = &runpath; \ 564 r = &runpath; \
393 } \ 568 } \
394 /* Verify the memory is somewhat sane */ \ 569 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 570 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \ 571 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 572 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \ 573 *r = elf->data + offset; \
574 /* cache the length in case we need to nuke this section later on */ \
575 if (fix_elf) \
576 offset = strlen(*r); \
399 /* If quiet, don't output paths in ld.so.conf */ \ 577 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \ 578 if (be_quiet) { \
401 size_t len; \ 579 size_t len; \
402 char *start, *end; \ 580 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \ 581 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \ 582 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \ 583 start = *r; \
406 /* scan each path in : delimited list */ \ 584 /* scan each path in : delimited list */ \
407 while (start) { \ 585 while (start) { \
408 rpath_security_checks(elf, start); \ 586 rpath_security_checks(elf, start, get_elfdtype(word)); \
409 end = strchr(start, ':'); \ 587 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \ 588 len = (end ? abs(end - start) : strlen(start)); \
589 if (use_ldcache) \
411 for (s = 0; ldpaths[s]; ++s) { \ 590 for (s = 0; ldpaths[s]; ++s) \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 591 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
413 *r = (end ? end + 1 : NULL); \ 592 *r = end; \
593 /* corner case ... if RPATH reads "/usr/lib:", we want \
594 * to show ':' rather than '' */ \
595 if (end && end[1] != '\0') \
596 (*r)++; \
414 break; \ 597 break; \
415 } \ 598 } \
416 } \
417 if (!*r || !ldpaths[s] || !end) \ 599 if (!*r || !end) \
418 start = NULL; \ 600 break; \
419 else \ 601 else \
420 start = start + len + 1; \ 602 start = start + len + 1; \
421 } \ 603 } \
422 } \ 604 } \
605 if (*r) { \
606 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
607 /* just nuke it */ \
608 nuke_it##B: \
609 memset(*r, 0x00, offset); \
610 *r = NULL; \
611 ESET(dyn->d_tag, DT_DEBUG); \
612 ESET(dyn->d_un.d_ptr, 0); \
613 } else if (fix_elf) { \
614 /* try to clean "bad" paths */ \
615 size_t len, tmpdir_len; \
616 char *start, *end; \
617 const char *tmpdir; \
618 start = *r; \
619 tmpdir = (getenv("TMPDIR") ? : "."); \
620 tmpdir_len = strlen(tmpdir); \
621 while (1) { \
622 end = strchr(start, ':'); \
623 if (start == end) { \
624 eat_this_path##B: \
625 len = strlen(end); \
626 memmove(start, end+1, len); \
627 start[len-1] = '\0'; \
628 end = start - 1; \
629 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
630 if (!end) { \
631 if (start == *r) \
632 goto nuke_it##B; \
633 *--start = '\0'; \
634 } else \
635 goto eat_this_path##B; \
636 } \
637 if (!end) \
638 break; \
639 start = end + 1; \
640 } \
641 if (**r == '\0') \
642 goto nuke_it##B; \
643 } \
644 if (*r) \
423 if (*r) *found_rpath = 1; \ 645 *found_rpath = 1; \
646 } \
424 } \ 647 } \
425 ++dyn; \ 648 ++dyn; \
426 } \ 649 } \
427 } } 650 } }
428 SHOW_RPATH(32) 651 SHOW_RPATH(32)
445 } else if (rpath || runpath) 668 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 669 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet) 670 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len); 671 xstrcat(ret, " - ", ret_len);
449} 672}
673
674#define LDSO_CACHE_MAGIC "ld.so-"
675#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
676#define LDSO_CACHE_VER "1.7.0"
677#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
678#define FLAG_ANY -1
679#define FLAG_TYPE_MASK 0x00ff
680#define FLAG_LIBC4 0x0000
681#define FLAG_ELF 0x0001
682#define FLAG_ELF_LIBC5 0x0002
683#define FLAG_ELF_LIBC6 0x0003
684#define FLAG_REQUIRED_MASK 0xff00
685#define FLAG_SPARC_LIB64 0x0100
686#define FLAG_IA64_LIB64 0x0200
687#define FLAG_X8664_LIB64 0x0300
688#define FLAG_S390_LIB64 0x0400
689#define FLAG_POWERPC_LIB64 0x0500
690#define FLAG_MIPS64_LIBN32 0x0600
691#define FLAG_MIPS64_LIBN64 0x0700
692
693static char *lookup_cache_lib(elfobj *, char *);
694
695#if defined(__GLIBC__) || defined(__UCLIBC__)
696
697static char *lookup_cache_lib(elfobj *elf, char *fname)
698{
699 int fd;
700 char *strs;
701 static char buf[__PAX_UTILS_PATH_MAX] = "";
702 const char cachefile[] = "/etc/ld.so.cache";
703 struct stat st;
704
705 typedef struct {
706 char magic[LDSO_CACHE_MAGIC_LEN];
707 char version[LDSO_CACHE_VER_LEN];
708 int nlibs;
709 } header_t;
710 header_t *header;
711
712 typedef struct {
713 int flags;
714 int sooffset;
715 int liboffset;
716 } libentry_t;
717 libentry_t *libent;
718
719 if (fname == NULL)
720 return NULL;
721
722 if (ldcache == NULL) {
723 if (stat(cachefile, &st))
724 return NULL;
725
726 fd = open(cachefile, O_RDONLY);
727 if (fd == -1)
728 return NULL;
729
730 /* cache these values so we only map/unmap the cache file once */
731 ldcache_size = st.st_size;
732 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
733 close(fd);
734
735 if (ldcache == MAP_FAILED) {
736 ldcache = NULL;
737 return NULL;
738 }
739
740 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
741 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
742 {
743 munmap(ldcache, ldcache_size);
744 ldcache = NULL;
745 return NULL;
746 }
747 } else
748 header = ldcache;
749
750 libent = ldcache + sizeof(header_t);
751 strs = (char *) &libent[header->nlibs];
752
753 for (fd = 0; fd < header->nlibs; ++fd) {
754 /* This should be more fine grained, but for now we assume that
755 * diff arches will not be cached together, and we ignore the
756 * the different multilib mips cases.
757 */
758 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
759 continue;
760 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
761 continue;
762
763 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
764 continue;
765
766 /* Return first hit because that is how the ldso rolls */
767 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
768 break;
769 }
770
771 return buf;
772}
773
774#elif defined(__NetBSD__)
775static char *lookup_cache_lib(elfobj *elf, char *fname)
776{
777 static char buf[__PAX_UTILS_PATH_MAX] = "";
778 static struct stat st;
779
780 char **ldpath;
781 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
782 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
783 continue; /* if the pathname is too long, or something went wrong, ignore */
784
785 if (stat(buf, &st) != 0)
786 continue; /* if the lib doesn't exist in *ldpath, look further */
787
788 /* NetBSD doesn't actually do sanity checks, it just loads the file
789 * and if that doesn't work, continues looking in other directories.
790 * This cannot easily be safely emulated, unfortunately. For now,
791 * just assume that if it exists, it's a valid library. */
792
793 return buf;
794 }
795
796 /* not found in any path */
797 return NULL;
798}
799#else
800#ifdef __ELF__
801#warning Cache support not implemented for your target
802#endif
803static char *lookup_cache_lib(elfobj *elf, char *fname)
804{
805 return NULL;
806}
807#endif
808
450static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) 809static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451{ 810{
452 unsigned long i; 811 unsigned long i;
453 char *needed; 812 char *needed;
454 void *strtbl_void; 813 void *strtbl_void;
814 char *p;
455 815
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; 816 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
457 817
458 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 818 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459 819
464 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 824 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
465 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 825 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
466 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 826 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
467 Elf ## B ## _Off offset; \ 827 Elf ## B ## _Off offset; \
468 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 828 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
469 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 829 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
470 offset = EGET(phdr[i].p_offset); \ 830 offset = EGET(phdr[i].p_offset); \
471 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 831 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
472 dyn = DYN ## B (elf->data + offset); \ 832 dyn = DYN ## B (elf->vdata + offset); \
473 while (EGET(dyn->d_tag) != DT_NULL) { \ 833 while (EGET(dyn->d_tag) != DT_NULL) { \
474 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 834 if (EGET(dyn->d_tag) == DT_NEEDED) { \
475 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 835 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
476 if (offset >= (Elf ## B ## _Off)elf->len) { \ 836 if (offset >= (Elf ## B ## _Off)elf->len) { \
477 ++dyn; \ 837 ++dyn; \
478 continue; \ 838 continue; \
479 } \ 839 } \
480 needed = (char*)(elf->data + offset); \ 840 needed = elf->data + offset; \
481 if (op == 0) { \ 841 if (op == 0) { \
482 if (!be_wewy_wewy_quiet) { \ 842 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \ 843 if (*found_needed) xchrcat(ret, ',', ret_len); \
844 if (use_ldcache) \
845 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
846 needed = p; \
484 xstrcat(ret, needed, ret_len); \ 847 xstrcat(ret, needed, ret_len); \
485 } \ 848 } \
486 *found_needed = 1; \ 849 *found_needed = 1; \
487 } else { \ 850 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ 851 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
489 *found_lib = 1; \ 852 *found_lib = 1; \
490 return (be_wewy_wewy_quiet ? NULL : needed); \ 853 return (be_wewy_wewy_quiet ? NULL : needed); \
491 } \ 854 } \
492 } \ 855 } \
493 } \ 856 } \
524} 887}
525static char *scanelf_file_bind(elfobj *elf, char *found_bind) 888static char *scanelf_file_bind(elfobj *elf, char *found_bind)
526{ 889{
527 unsigned long i; 890 unsigned long i;
528 struct stat s; 891 struct stat s;
892 char dynamic = 0;
529 893
530 if (!show_bind) return NULL; 894 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL; 895 if (!elf->phdr) return NULL;
532 896
533#define SHOW_BIND(B) \ 897#define SHOW_BIND(B) \
535 Elf ## B ## _Dyn *dyn; \ 899 Elf ## B ## _Dyn *dyn; \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 900 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 901 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \ 902 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 903 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 904 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
905 dynamic = 1; \
541 offset = EGET(phdr[i].p_offset); \ 906 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 907 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \ 908 dyn = DYN ## B (elf->vdata + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \ 909 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 910 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
546 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ 911 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
547 { \ 912 { \
548 if (be_quiet) return NULL; \ 913 if (be_quiet) return NULL; \
556 SHOW_BIND(32) 921 SHOW_BIND(32)
557 SHOW_BIND(64) 922 SHOW_BIND(64)
558 923
559 if (be_wewy_wewy_quiet) return NULL; 924 if (be_wewy_wewy_quiet) return NULL;
560 925
926 /* don't output anything if quiet mode and the ELF is static or not setuid */
561 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 927 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
562 return NULL; 928 return NULL;
563 } else { 929 } else {
564 *found_bind = 1; 930 *found_bind = 1;
565 return (char *) "LAZY"; 931 return (char *)(dynamic ? "LAZY" : "STATIC");
566 } 932 }
567} 933}
568static char *scanelf_file_soname(elfobj *elf, char *found_soname) 934static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569{ 935{
570 unsigned long i; 936 unsigned long i;
582 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 948 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
583 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 949 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
584 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 950 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
585 Elf ## B ## _Off offset; \ 951 Elf ## B ## _Off offset; \
586 /* only look for soname in shared objects */ \ 952 /* only look for soname in shared objects */ \
587 if (ehdr->e_type != ET_DYN) \ 953 if (EGET(ehdr->e_type) != ET_DYN) \
588 return NULL; \ 954 return NULL; \
589 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 955 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
590 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 956 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
591 offset = EGET(phdr[i].p_offset); \ 957 offset = EGET(phdr[i].p_offset); \
592 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 958 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
593 dyn = DYN ## B (elf->data + offset); \ 959 dyn = DYN ## B (elf->vdata + offset); \
594 while (EGET(dyn->d_tag) != DT_NULL) { \ 960 while (EGET(dyn->d_tag) != DT_NULL) { \
595 if (EGET(dyn->d_tag) == DT_SONAME) { \ 961 if (EGET(dyn->d_tag) == DT_SONAME) { \
596 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 962 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
597 if (offset >= (Elf ## B ## _Off)elf->len) { \ 963 if (offset >= (Elf ## B ## _Off)elf->len) { \
598 ++dyn; \ 964 ++dyn; \
599 continue; \ 965 continue; \
600 } \ 966 } \
601 soname = (char*)(elf->data + offset); \ 967 soname = elf->data + offset; \
602 *found_soname = 1; \ 968 *found_soname = 1; \
603 return (be_wewy_wewy_quiet ? NULL : soname); \ 969 return (be_wewy_wewy_quiet ? NULL : soname); \
604 } \ 970 } \
605 ++dyn; \ 971 ++dyn; \
606 } \ 972 } \
609 SHOW_SONAME(64) 975 SHOW_SONAME(64)
610 } 976 }
611 977
612 return NULL; 978 return NULL;
613} 979}
980
981/*
982 * We support the symbol form:
983 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
984 * If the symbol name is empty, then all symbols are matched.
985 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
986 * Do not rely on this output format at all.
987 * Otherwise the symbol name is used to search (either regex or string compare).
988 * If the first char of the symbol name is a plus ("+"), then only match
989 * defined symbols. If it's a minus ("-"), only match undefined symbols.
990 * Putting modifiers in between the percent signs allows for more in depth
991 * filters. There are groups of modifiers. If you don't specify a member
992 * of a group, then all types in that group are matched. The current
993 * groups and their types are:
994 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
995 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
996 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
997 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
998 * You can search for multiple symbols at once by seperating with a comma (",").
999 *
1000 * Some examples:
1001 * ELFs with a weak function "foo":
1002 * scanelf -s %wf%foo <ELFs>
1003 * ELFs that define the symbol "main":
1004 * scanelf -s +main <ELFs>
1005 * scanelf -s %d%main <ELFs>
1006 * ELFs that refer to the undefined symbol "brk":
1007 * scanelf -s -brk <ELFs>
1008 * scanelf -s %u%brk <ELFs>
1009 * All global defined objects in an ELF:
1010 * scanelf -s %ogd% <ELF>
1011 */
1012static void
1013scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1014 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1015{
1016 char *this_sym, *next_sym, saved = saved;
1017
1018 /* allow the user to specify a comma delimited list of symbols to search for */
1019 next_sym = NULL;
1020 do {
1021 bool inc_notype, inc_object, inc_func, inc_file,
1022 inc_local, inc_global, inc_weak,
1023 inc_def, inc_undef, inc_abs, inc_common;
1024
1025 if (next_sym) {
1026 next_sym[-1] = saved;
1027 this_sym = next_sym;
1028 } else
1029 this_sym = find_sym;
1030 if ((next_sym = strchr(this_sym, ','))) {
1031 /* make parsing easier by killing the comma temporarily */
1032 saved = *next_sym;
1033 *next_sym = '\0';
1034 next_sym += 1;
1035 }
1036
1037 /* symbol selection! */
1038 inc_notype = inc_object = inc_func = inc_file = \
1039 inc_local = inc_global = inc_weak = \
1040 inc_def = inc_undef = inc_abs = inc_common = \
1041 (*this_sym != '%');
1042
1043 /* parse the contents of %...% */
1044 if (!inc_notype) {
1045 while (*(this_sym++)) {
1046 if (*this_sym == '%') {
1047 ++this_sym;
1048 break;
1049 }
1050 switch (*this_sym) {
1051 case 'n': inc_notype = true; break;
1052 case 'o': inc_object = true; break;
1053 case 'f': inc_func = true; break;
1054 case 'F': inc_file = true; break;
1055 case 'l': inc_local = true; break;
1056 case 'g': inc_global = true; break;
1057 case 'w': inc_weak = true; break;
1058 case 'd': inc_def = true; break;
1059 case 'u': inc_undef = true; break;
1060 case 'a': inc_abs = true; break;
1061 case 'c': inc_common = true; break;
1062 default: err("invalid symbol selector '%c'", *this_sym);
1063 }
1064 }
1065
1066 /* If no types are matched, not match all */
1067 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1068 inc_notype = inc_object = inc_func = inc_file = true;
1069 if (!inc_local && !inc_global && !inc_weak)
1070 inc_local = inc_global = inc_weak = true;
1071 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1072 inc_def = inc_undef = inc_abs = inc_common = true;
1073
1074 /* backwards compat for defined/undefined short hand */
1075 } else if (*this_sym == '+') {
1076 inc_undef = false;
1077 ++this_sym;
1078 } else if (*this_sym == '-') {
1079 inc_def = inc_abs = inc_common = false;
1080 ++this_sym;
1081 }
1082
1083 /* filter symbols */
1084 if ((!inc_notype && stt == STT_NOTYPE) || \
1085 (!inc_object && stt == STT_OBJECT) || \
1086 (!inc_func && stt == STT_FUNC ) || \
1087 (!inc_file && stt == STT_FILE ) || \
1088 (!inc_local && stb == STB_LOCAL ) || \
1089 (!inc_global && stb == STB_GLOBAL) || \
1090 (!inc_weak && stb == STB_WEAK ) || \
1091 (!inc_def && shn && shn < SHN_LORESERVE) || \
1092 (!inc_undef && shn == SHN_UNDEF ) || \
1093 (!inc_abs && shn == SHN_ABS ) || \
1094 (!inc_common && shn == SHN_COMMON))
1095 continue;
1096
1097 if (*this_sym == '*') {
1098 /* a "*" symbol gets you debug output */
1099 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1100 ((*found_sym == 0) ? "\n\t" : "\t"),
1101 elf->base_filename,
1102 size,
1103 get_elfstttype(stt),
1104 get_elfstbtype(stb),
1105 get_elfshntype(shn),
1106 symname);
1107 goto matched;
1108
1109 } else {
1110 if (g_match) {
1111 /* regex match the symbol */
1112 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1113 continue;
1114
1115 } else if (*this_sym) {
1116 /* give empty symbols a "pass", else do a normal compare */
1117 const size_t len = strlen(this_sym);
1118 if (!(strncmp(this_sym, symname, len) == 0 &&
1119 /* Accept unversioned symbol names */
1120 (symname[len] == '\0' || symname[len] == '@')))
1121 continue;
1122 }
1123
1124 if (be_semi_verbose) {
1125 char buf[1024];
1126 snprintf(buf, sizeof(buf), "%lX %s %s",
1127 size,
1128 get_elfstttype(stt),
1129 this_sym);
1130 *ret = xstrdup(buf);
1131 } else {
1132 if (*ret) xchrcat(ret, ',', ret_len);
1133 xstrcat(ret, symname, ret_len);
1134 }
1135
1136 goto matched;
1137 }
1138 } while (next_sym);
1139
1140 return;
1141
1142 matched:
1143 *found_sym = 1;
1144 if (next_sym)
1145 next_sym[-1] = saved;
1146}
1147
614static char *scanelf_file_sym(elfobj *elf, char *found_sym) 1148static char *scanelf_file_sym(elfobj *elf, char *found_sym)
615{ 1149{
616 unsigned long i; 1150 unsigned long i;
1151 char *ret;
617 void *symtab_void, *strtab_void; 1152 void *symtab_void, *strtab_void;
618 1153
619 if (!find_sym) return NULL; 1154 if (!find_sym) return NULL;
1155 ret = NULL;
620 1156
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); 1157 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622 1158
623 if (symtab_void && strtab_void) { 1159 if (symtab_void && strtab_void) {
624#define FIND_SYM(B) \ 1160#define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \ 1161 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1162 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1163 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1164 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1165 unsigned long cnt = EGET(symtab->sh_entsize); \
630 char *symname; \ 1166 char *symname; \
1167 size_t ret_len = 0; \
1168 if (cnt) \
1169 cnt = EGET(symtab->sh_size) / cnt; \
631 for (i = 0; i < cnt; ++i) { \ 1170 for (i = 0; i < cnt; ++i) { \
1171 if ((void*)sym > elf->data_end) { \
1172 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1173 goto break_out; \
1174 } \
632 if (sym->st_name) { \ 1175 if (sym->st_name) { \
1176 /* make sure the symbol name is in acceptable memory range */ \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1177 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
634 if (*find_sym == '*') { \ 1178 if ((void*)symname > elf->data_end) { \
635 printf("%s(%s) %5lX %15s %s\n", \ 1179 warnf("%s: corrupt ELF symbols", elf->filename); \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1180 ++sym; \
637 elf->base_filename, \ 1181 continue; \
638 (long)sym->st_size, \ 1182 } \
639 (char *)get_elfstttype(sym->st_info), \ 1183 scanelf_match_symname(elf, found_sym, \
640 symname); \ 1184 &ret, &ret_len, symname, \
641 *found_sym = 1; \ 1185 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
642 } else if ((strcmp(find_sym, symname) == 0) || \ 1186 ELF##B##_ST_BIND(EGET(sym->st_info)), \
643 (strcmp(symname, versioned_symname) == 0)) \ 1187 EGET(sym->st_shndx), \
644 (*found_sym)++; \ 1188 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1189 EGET(sym->st_size)); \
645 } \ 1190 } \
646 ++sym; \ 1191 ++sym; \
647 } } 1192 } }
648 FIND_SYM(32) 1193 FIND_SYM(32)
649 FIND_SYM(64) 1194 FIND_SYM(64)
650 } 1195 }
651 1196
1197break_out:
652 if (be_wewy_wewy_quiet) return NULL; 1198 if (be_wewy_wewy_quiet) return NULL;
653 1199
654 if (*find_sym != '*' && *found_sym) 1200 if (*find_sym != '*' && *found_sym)
655 return find_sym; 1201 return ret;
656 if (be_quiet) 1202 if (be_quiet)
657 return NULL; 1203 return NULL;
658 else 1204 else
659 return (char *)" - "; 1205 return (char *)" - ";
660} 1206}
1207
1208static char *scanelf_file_sections(elfobj *elf, char *found_section)
1209{
1210 if (!find_section)
1211 return NULL;
1212
1213#define FIND_SECTION(B) \
1214 if (elf->elf_class == ELFCLASS ## B) { \
1215 int invert; \
1216 Elf ## B ## _Shdr *section; \
1217 invert = (*find_section == '!' ? 1 : 0); \
1218 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1219 if ((section == NULL && invert) || (section != NULL && !invert)) \
1220 *found_section = 1; \
1221 }
1222 FIND_SECTION(32)
1223 FIND_SECTION(64)
1224
1225 if (be_wewy_wewy_quiet)
1226 return NULL;
1227
1228 if (*found_section)
1229 return find_section;
1230
1231 if (be_quiet)
1232 return NULL;
1233 else
1234 return (char *)" - ";
1235}
1236
661/* scan an elf file and show all the fun stuff */ 1237/* scan an elf file and show all the fun stuff */
662#define prints(str) write(fileno(stdout), str, strlen(str)) 1238#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
663static void scanelf_file(const char *filename) 1239static int scanelf_elfobj(elfobj *elf)
664{ 1240{
665 unsigned long i; 1241 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel, 1242 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname, 1243 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels; 1244 found_sym, found_lib, found_file, found_textrels, found_section;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL; 1245 static char *out_buffer = NULL;
672 static size_t out_len; 1246 static size_t out_len;
673 1247
674 /* make sure 'filename' exists */
675 if (lstat(filename, &st) == -1) {
676 if (be_verbose > 2) printf("%s: does not exist\n", filename);
677 return;
678 }
679 /* always handle regular files and handle symlinked files if no -y */
680 if (S_ISLNK(st.st_mode)) {
681 if (!scan_symlink) return;
682 stat(filename, &st);
683 }
684 if (!S_ISREG(st.st_mode)) {
685 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
686 return;
687 }
688
689 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 1248 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 1249 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0; 1250 found_sym = found_lib = found_file = found_textrels = found_section = 0;
692 1251
693 /* verify this is real ELF */
694 if ((elf = readelf(filename)) == NULL) {
695 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
696 return;
697 }
698
699 if (be_verbose > 1) 1252 if (be_verbose > 2)
700 printf("%s: scanning file {%s,%s}\n", filename, 1253 printf("%s: scanning file {%s,%s}\n", elf->filename,
701 get_elfeitype(EI_CLASS, elf->elf_class), 1254 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1255 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose) 1256 else if (be_verbose > 1)
704 printf("%s: scanning file\n", filename); 1257 printf("%s: scanning file\n", elf->filename);
705 1258
706 /* init output buffer */ 1259 /* init output buffer */
707 if (!out_buffer) { 1260 if (!out_buffer) {
708 out_len = sizeof(char) * 80; 1261 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len); 1262 out_buffer = xmalloc(out_len);
710 } 1263 }
711 *out_buffer = '\0'; 1264 *out_buffer = '\0';
712 1265
713 /* show the header */ 1266 /* show the header */
714 if (!be_quiet && show_banner) { 1267 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) { 1268 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue; 1269 if (!IS_MODIFIER(out_format[i])) continue;
717 1270
718 switch (out_format[++i]) { 1271 switch (out_format[++i]) {
1272 case '+': break;
719 case '%': break; 1273 case '%': break;
720 case '#': break; 1274 case '#': break;
721 case 'F': 1275 case 'F':
722 case 'p': 1276 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break; 1277 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break; 1278 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break; 1279 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break; 1280 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break; 1281 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break; 1282 case 'r': prints("RPATH "); break;
1283 case 'M': prints("CLASS "); break;
729 case 'n': prints("NEEDED "); break; 1284 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break; 1285 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break; 1286 case 'b': prints("BIND "); break;
1287 case 'Z': prints("SIZE "); break;
732 case 'S': prints("SONAME "); break; 1288 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break; 1289 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break; 1290 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break; 1291 case 'T': prints("TEXTRELS "); break;
1292 case 'k': prints("SECTION "); break;
1293 case 'a': prints("ARCH "); break;
1294 case 'I': prints("OSABI "); break;
1295 case 'Y': prints("EABI "); break;
1296 case 'O': prints("PERM "); break;
1297 case 'D': prints("ENDIAN "); break;
736 default: warnf("'%c' has no title ?", out_format[i]); 1298 default: warnf("'%c' has no title ?", out_format[i]);
737 } 1299 }
738 } 1300 }
739 if (!found_file) prints("FILE "); 1301 if (!found_file) prints("FILE ");
740 prints("\n"); 1302 prints("\n");
744 1306
745 /* dump all the good stuff */ 1307 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) { 1308 for (i = 0; out_format[i]; ++i) {
747 const char *out; 1309 const char *out;
748 const char *tmp; 1310 const char *tmp;
749 1311 static char ubuf[sizeof(unsigned long)*2];
750 /* make sure we trim leading spaces in quiet mode */
751 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
752 *out_buffer = '\0';
753
754 if (!IS_MODIFIER(out_format[i])) { 1312 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len); 1313 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue; 1314 continue;
757 } 1315 }
758 1316
759 out = NULL; 1317 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#'); 1318 be_wewy_wewy_quiet = (out_format[i] == '#');
1319 be_semi_verbose = (out_format[i] == '+');
761 switch (out_format[++i]) { 1320 switch (out_format[++i]) {
1321 case '+':
762 case '%': 1322 case '%':
763 case '#': 1323 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break; 1324 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F': 1325 case 'F':
766 found_file = 1; 1326 found_file = 1;
767 if (be_wewy_wewy_quiet) break; 1327 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len); 1328 xstrcat(&out_buffer, elf->filename, &out_len);
769 break; 1329 break;
770 case 'p': 1330 case 'p':
771 found_file = 1; 1331 found_file = 1;
772 if (be_wewy_wewy_quiet) break; 1332 if (be_wewy_wewy_quiet) break;
773 tmp = filename; 1333 tmp = elf->filename;
774 if (search_path) { 1334 if (search_path) {
775 ssize_t len_search = strlen(search_path); 1335 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename); 1336 ssize_t len_file = strlen(elf->filename);
777 if (!strncmp(filename, search_path, len_search) && \ 1337 if (!strncmp(elf->filename, search_path, len_search) && \
778 len_file > len_search) 1338 len_file > len_search)
779 tmp += len_search; 1339 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1340 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 } 1341 }
782 xstrcat(&out_buffer, tmp, &out_len); 1342 xstrcat(&out_buffer, tmp, &out_len);
783 break; 1343 break;
784 case 'f': 1344 case 'f':
785 found_file = 1; 1345 found_file = 1;
786 if (be_wewy_wewy_quiet) break; 1346 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/'); 1347 tmp = strrchr(elf->filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1); 1348 tmp = (tmp == NULL ? elf->filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len); 1349 xstrcat(&out_buffer, tmp, &out_len);
790 break; 1350 break;
791 case 'o': out = get_elfetype(elf); break; 1351 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1352 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
793 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 1353 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
794 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1354 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; 1355 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
796 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1356 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1357 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1358 case 'D': out = get_endian(elf); break;
1359 case 'O': out = strfileperms(elf->filename); break;
797 case 'n': 1360 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; 1361 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
799 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1362 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1363 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break; 1364 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break; 1365 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1366 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1367 case 'a': out = get_elfemtype(elf); break;
1368 case 'I': out = get_elfosabi(elf); break;
1369 case 'Y': out = get_elf_eabi(elf); break;
1370 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
803 default: warnf("'%c' has no scan code?", out_format[i]); 1371 default: warnf("'%c' has no scan code?", out_format[i]);
804 } 1372 }
1373 if (out)
805 if (out) xstrcat(&out_buffer, out, &out_len); 1374 xstrcat(&out_buffer, out, &out_len);
806 } 1375 }
807 1376
808#define FOUND_SOMETHING() \ 1377#define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \ 1378 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \ 1379 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels) 1380 found_soname || found_sym || found_lib || found_textrels || found_section )
812 1381
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1382 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len); 1383 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len); 1384 xstrcat(&out_buffer, elf->filename, &out_len);
816 } 1385 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 1386 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer); 1387 puts(out_buffer);
819 fflush(stdout); 1388 fflush(stdout);
820 } 1389 }
821 1390
1391 return 0;
1392}
1393
1394/* scan a single elf */
1395static int scanelf_elf(const char *filename, int fd, size_t len)
1396{
1397 int ret = 1;
1398 elfobj *elf;
1399
1400 /* verify this is real ELF */
1401 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1402 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1403 return ret;
1404 }
1405 switch (match_bits) {
1406 case 32:
1407 if (elf->elf_class != ELFCLASS32)
1408 goto label_done;
1409 break;
1410 case 64:
1411 if (elf->elf_class != ELFCLASS64)
1412 goto label_done;
1413 break;
1414 default: break;
1415 }
1416 if (strlen(match_etypes)) {
1417 char sbuf[126];
1418 strncpy(sbuf, match_etypes, sizeof(sbuf));
1419 if (strchr(match_etypes, ',') != NULL) {
1420 char *p;
1421 while ((p = strrchr(sbuf, ',')) != NULL) {
1422 *p = 0;
1423 if (etype_lookup(p+1) == get_etype(elf))
1424 goto label_ret;
1425 }
1426 }
1427 if (etype_lookup(sbuf) != get_etype(elf))
1428 goto label_done;
1429 }
1430
1431label_ret:
1432 ret = scanelf_elfobj(elf);
1433
1434label_done:
822 unreadelf(elf); 1435 unreadelf(elf);
1436 return ret;
1437}
1438
1439/* scan an archive of elfs */
1440static int scanelf_archive(const char *filename, int fd, size_t len)
1441{
1442 archive_handle *ar;
1443 archive_member *m;
1444 char *ar_buffer;
1445 elfobj *elf;
1446
1447 ar = ar_open_fd(filename, fd);
1448 if (ar == NULL)
1449 return 1;
1450
1451 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1452 while ((m = ar_next(ar)) != NULL) {
1453 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1454 if (cur_pos == -1)
1455 errp("lseek() failed");
1456 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1457 if (elf) {
1458 scanelf_elfobj(elf);
1459 unreadelf(elf);
1460 }
1461 }
1462 munmap(ar_buffer, len);
1463
1464 return 0;
1465}
1466/* scan a file which may be an elf or an archive or some other magical beast */
1467static int scanelf_file(const char *filename, const struct stat *st_cache)
1468{
1469 const struct stat *st = st_cache;
1470 struct stat symlink_st;
1471 int fd;
1472
1473 /* always handle regular files and handle symlinked files if no -y */
1474 if (S_ISLNK(st->st_mode)) {
1475 if (!scan_symlink) return 1;
1476 stat(filename, &symlink_st);
1477 st = &symlink_st;
1478 }
1479
1480 if (!S_ISREG(st->st_mode)) {
1481 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1482 return 1;
1483 }
1484
1485 if (match_perms) {
1486 if ((st->st_mode | match_perms) != st->st_mode)
1487 return 1;
1488 }
1489 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1490 return 1;
1491
1492 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1493 /* if it isn't an ELF, maybe it's an .a archive */
1494 scanelf_archive(filename, fd, st->st_size);
1495
1496 close(fd);
1497 return 0;
823} 1498}
824 1499
825/* scan a directory for ET_EXEC files and print when we find one */ 1500/* scan a directory for ET_EXEC files and print when we find one */
826static void scanelf_dir(const char *path) 1501static int scanelf_dir(const char *path)
827{ 1502{
828 register DIR *dir; 1503 register DIR *dir;
829 register struct dirent *dentry; 1504 register struct dirent *dentry;
830 struct stat st_top, st; 1505 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX]; 1506 char buf[__PAX_UTILS_PATH_MAX];
832 size_t pathlen = 0, len = 0; 1507 size_t pathlen = 0, len = 0;
1508 int ret = 0;
833 1509
834 /* make sure path exists */ 1510 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) { 1511 if (lstat(path, &st_top) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path); 1512 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return; 1513 return 1;
838 } 1514 }
839 1515
840 /* ok, if it isn't a directory, assume we can open it */ 1516 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) { 1517 if (!S_ISDIR(st_top.st_mode)) {
842 scanelf_file(path); 1518 return scanelf_file(path, &st_top);
843 return;
844 } 1519 }
845 1520
846 /* now scan the dir looking for fun stuff */ 1521 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) { 1522 if ((dir = opendir(path)) == NULL) {
848 warnf("could not opendir %s: %s", path, strerror(errno)); 1523 warnf("could not opendir %s: %s", path, strerror(errno));
849 return; 1524 return 1;
850 } 1525 }
851 if (be_verbose) printf("%s: scanning dir\n", path); 1526 if (be_verbose > 1) printf("%s: scanning dir\n", path);
852 1527
853 pathlen = strlen(path); 1528 pathlen = strlen(path);
854 while ((dentry = readdir(dir))) { 1529 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1530 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue; 1531 continue;
858 if (len >= sizeof(buf)) { 1533 if (len >= sizeof(buf)) {
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, 1534 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
860 (unsigned long)len, (unsigned long)sizeof(buf)); 1535 (unsigned long)len, (unsigned long)sizeof(buf));
861 continue; 1536 continue;
862 } 1537 }
863 sprintf(buf, "%s/%s", path, dentry->d_name); 1538 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
864 if (lstat(buf, &st) != -1) { 1539 if (lstat(buf, &st) != -1) {
865 if (S_ISREG(st.st_mode)) 1540 if (S_ISREG(st.st_mode))
866 scanelf_file(buf); 1541 ret = scanelf_file(buf, &st);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1542 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1543 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf); 1544 ret = scanelf_dir(buf);
870 } 1545 }
871 } 1546 }
872 } 1547 }
873 closedir(dir); 1548 closedir(dir);
1549 return ret;
874} 1550}
875 1551
876static int scanelf_from_file(char *filename) 1552static int scanelf_from_file(const char *filename)
877{ 1553{
878 FILE *fp = NULL; 1554 FILE *fp = NULL;
879 char *p; 1555 char *p;
880 char path[_POSIX_PATH_MAX]; 1556 char path[__PAX_UTILS_PATH_MAX];
1557 int ret = 0;
881 1558
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1559 if (strcmp(filename, "-") == 0)
883 fp = stdin; 1560 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL) 1561 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1; 1562 return 1;
886 1563
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1564 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
888 if ((p = strchr(path, '\n')) != NULL) 1565 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0; 1566 *p = 0;
890 search_path = path; 1567 search_path = path;
891 scanelf_dir(path); 1568 ret = scanelf_dir(path);
892 } 1569 }
893 if (fp != stdin) 1570 if (fp != stdin)
894 fclose(fp); 1571 fclose(fp);
895 return 0; 1572 return ret;
896} 1573}
897 1574
898static void load_ld_so_conf() 1575#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1576
1577static int load_ld_cache_config(int i, const char *fname)
899{ 1578{
900 FILE *fp = NULL; 1579 FILE *fp = NULL;
901 char *p; 1580 char *p;
902 char path[_POSIX_PATH_MAX]; 1581 char path[__PAX_UTILS_PATH_MAX];
903 int i = 0;
904 1582
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1583 if (i + 1 == ARRAY_SIZE(ldpaths))
906 return; 1584 return i;
907 1585
1586 if ((fp = fopen(fname, "r")) == NULL)
1587 return i;
1588
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1589 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
909 if (*path != '/')
910 continue;
911
912 if ((p = strrchr(path, '\r')) != NULL) 1590 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0; 1591 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL) 1592 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0; 1593 *p = 0;
916 1594
1595 /* recursive includes of the same file will make this segfault. */
1596 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1597 glob_t gl;
1598 size_t x;
1599 char gpath[__PAX_UTILS_PATH_MAX];
1600
1601 memset(gpath, 0, sizeof(gpath));
1602
1603 if (path[8] != '/')
1604 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1605 else
1606 strncpy(gpath, &path[8], sizeof(gpath));
1607
1608 if (glob(gpath, 0, NULL, &gl) == 0) {
1609 for (x = 0; x < gl.gl_pathc; ++x) {
1610 /* try to avoid direct loops */
1611 if (strcmp(gl.gl_pathv[x], fname) == 0)
1612 continue;
1613 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1614 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1615 globfree(&gl);
1616 return i;
1617 }
1618 }
1619 globfree(&gl);
1620 continue;
1621 }
1622 }
1623
1624 if (*path != '/')
1625 continue;
1626
917 ldpaths[i++] = xstrdup(path); 1627 ldpaths[i++] = xstrdup(path);
918 1628
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1629 if (i + 1 == ARRAY_SIZE(ldpaths))
920 break; 1630 break;
921 } 1631 }
922 ldpaths[i] = NULL; 1632 ldpaths[i] = NULL;
923 1633
924 fclose(fp); 1634 fclose(fp);
1635 return i;
925} 1636}
1637
1638#elif defined(__FreeBSD__) || defined(__DragonFly__)
1639
1640static int load_ld_cache_config(int i, const char *fname)
1641{
1642 FILE *fp = NULL;
1643 char *b = NULL, *p;
1644 struct elfhints_hdr hdr;
1645
1646 if (i + 1 == ARRAY_SIZE(ldpaths))
1647 return i;
1648
1649 if ((fp = fopen(fname, "r")) == NULL)
1650 return i;
1651
1652 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1653 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1654 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1655 {
1656 fclose(fp);
1657 return i;
1658 }
1659
1660 b = xmalloc(hdr.dirlistlen + 1);
1661 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1662 fclose(fp);
1663 free(b);
1664 return i;
1665 }
1666
1667 while ((p = strsep(&b, ":"))) {
1668 if (*p == '\0') continue;
1669 ldpaths[i++] = xstrdup(p);
1670
1671 if (i + 1 == ARRAY_SIZE(ldpaths))
1672 break;
1673 }
1674 ldpaths[i] = NULL;
1675
1676 free(b);
1677 fclose(fp);
1678 return i;
1679}
1680
1681#else
1682#ifdef __ELF__
1683#warning Cache config support not implemented for your target
1684#endif
1685static int load_ld_cache_config(int i, const char *fname)
1686{
1687 memset(ldpaths, 0x00, sizeof(ldpaths));
1688 return 0;
1689}
1690#endif
926 1691
927/* scan /etc/ld.so.conf for paths */ 1692/* scan /etc/ld.so.conf for paths */
928static void scanelf_ldpath() 1693static void scanelf_ldpath(void)
929{ 1694{
930 char scan_l, scan_ul, scan_ull; 1695 char scan_l, scan_ul, scan_ull;
931 int i = 0; 1696 int i = 0;
932 1697
933 if (!ldpaths[0]) 1698 if (!ldpaths[0])
934 err("Unable to load any paths from ld.so.conf"); 1699 err("Unable to load any paths from ld.so.conf");
935 1700
936 scan_l = scan_ul = scan_ull = 0; 1701 scan_l = scan_ul = scan_ull = 0;
937 1702
938 while (ldpaths[i]) { 1703 while (ldpaths[i]) {
939 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; 1704 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
940 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; 1705 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
941 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; 1706 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
942 scanelf_dir(ldpaths[i]); 1707 scanelf_dir(ldpaths[i]);
943 ++i; 1708 ++i;
944 } 1709 }
945 1710
947 if (!scan_ul) scanelf_dir("/usr/lib"); 1712 if (!scan_ul) scanelf_dir("/usr/lib");
948 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1713 if (!scan_ull) scanelf_dir("/usr/local/lib");
949} 1714}
950 1715
951/* scan env PATH for paths */ 1716/* scan env PATH for paths */
952static void scanelf_envpath() 1717static void scanelf_envpath(void)
953{ 1718{
954 char *path, *p; 1719 char *path, *p;
955 1720
956 path = getenv("PATH"); 1721 path = getenv("PATH");
957 if (!path) 1722 if (!path)
964 } 1729 }
965 1730
966 free(path); 1731 free(path);
967} 1732}
968 1733
969 1734/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
970
971/* usage / invocation handling functions */
972#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" 1735#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
973#define a_argument required_argument 1736#define a_argument required_argument
974static struct option const long_opts[] = { 1737static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'}, 1738 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'}, 1739 {"ldpath", no_argument, NULL, 'l'},
977 {"recursive", no_argument, NULL, 'R'}, 1740 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'}, 1741 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'}, 1742 {"symlink", no_argument, NULL, 'y'},
1743 {"archives", no_argument, NULL, 'A'},
1744 {"ldcache", no_argument, NULL, 'L'},
1745 {"fix", no_argument, NULL, 'X'},
1746 {"setpax", a_argument, NULL, 'z'},
980 {"pax", no_argument, NULL, 'x'}, 1747 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'}, 1748 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'}, 1749 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'}, 1750 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'}, 1751 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'}, 1752 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'}, 1753 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'}, 1754 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'}, 1755 {"symbol", a_argument, NULL, 's'},
1756 {"section", a_argument, NULL, 'k'},
989 {"lib", a_argument, NULL, 'N'}, 1757 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'}, 1758 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'}, 1759 {"textrels", no_argument, NULL, 'T'},
1760 {"etype", a_argument, NULL, 'E'},
1761 {"bits", a_argument, NULL, 'M'},
1762 {"endian", no_argument, NULL, 'D'},
1763 {"osabi", no_argument, NULL, 'I'},
1764 {"eabi", no_argument, NULL, 'Y'},
1765 {"perms", a_argument, NULL, 'O'},
1766 {"size", no_argument, NULL, 'Z'},
992 {"all", no_argument, NULL, 'a'}, 1767 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'}, 1768 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'}, 1769 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'}, 1770 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'}, 1771 {"from", a_argument, NULL, 'f'},
997 {"file", a_argument, NULL, 'o'}, 1772 {"file", a_argument, NULL, 'o'},
1773 {"nocolor", no_argument, NULL, 'C'},
998 {"nobanner", no_argument, NULL, 'B'}, 1774 {"nobanner", no_argument, NULL, 'B'},
999 {"help", no_argument, NULL, 'h'}, 1775 {"help", no_argument, NULL, 'h'},
1000 {"version", no_argument, NULL, 'V'}, 1776 {"version", no_argument, NULL, 'V'},
1001 {NULL, no_argument, NULL, 0x0} 1777 {NULL, no_argument, NULL, 0x0}
1002}; 1778};
1004static const char *opts_help[] = { 1780static const char *opts_help[] = {
1005 "Scan all directories in PATH environment", 1781 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf", 1782 "Scan all directories in /etc/ld.so.conf",
1007 "Scan directories recursively", 1783 "Scan directories recursively",
1008 "Don't recursively cross mount points", 1784 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n", 1785 "Don't scan symlinks",
1786 "Scan archives (.a files)",
1787 "Utilize ld.so.cache information (use with -r/-n)",
1788 "Try and 'fix' bad things (use with -r/-e)",
1789 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1010 "Print PaX markings", 1790 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings", 1791 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information", 1792 "Print TEXTREL information",
1013 "Print RPATH information", 1793 "Print RPATH information",
1014 "Print NEEDED information", 1794 "Print NEEDED information",
1015 "Print INTERP information", 1795 "Print INTERP information",
1016 "Print BIND information", 1796 "Print BIND information",
1017 "Print SONAME information", 1797 "Print SONAME information",
1018 "Find a specified symbol", 1798 "Find a specified symbol",
1799 "Find a specified section",
1019 "Find a specified library", 1800 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)", 1801 "Use strncmp to match libraries. (use with -N)",
1021 "Locate cause of TEXTREL", 1802 "Locate cause of TEXTREL",
1022 "Print all scanned info (-x -e -t -r -b)\n", 1803 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1804 "Print only ELF files matching numeric bits",
1805 "Print Endianness",
1806 "Print OSABI",
1807 "Print EABI (EM_ARM Only)",
1808 "Print only ELF files matching octal permissions",
1809 "Print ELF file size",
1810 "Print all useful/simple info\n",
1023 "Only output 'bad' things", 1811 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)", 1812 "Be verbose (can be specified more than once)",
1025 "Use specified format for output", 1813 "Use specified format for output",
1026 "Read input stream from a filename", 1814 "Read input stream from a filename",
1027 "Write output stream to a filename", 1815 "Write output stream to a filename",
1816 "Don't emit color in output",
1028 "Don't display the header", 1817 "Don't display the header",
1029 "Print this help and exit", 1818 "Print this help and exit",
1030 "Print version and exit", 1819 "Print version and exit",
1031 NULL 1820 NULL
1032}; 1821};
1034/* display usage and exit */ 1823/* display usage and exit */
1035static void usage(int status) 1824static void usage(int status)
1036{ 1825{
1037 unsigned long i; 1826 unsigned long i;
1038 printf("* Scan ELF binaries for stuff\n\n" 1827 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1828 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS); 1829 printf("Options: -[%s]\n", PARSE_FLAGS);
1041 for (i = 0; long_opts[i].name; ++i) 1830 for (i = 0; long_opts[i].name; ++i)
1042 if (long_opts[i].has_arg == no_argument) 1831 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1832 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1044 long_opts[i].name, opts_help[i]); 1833 long_opts[i].name, opts_help[i]);
1045 else 1834 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1835 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]); 1836 long_opts[i].name, opts_help[i]);
1048 1837
1049 if (status != EXIT_SUCCESS) 1838 puts("\nFor more information, see the scanelf(1) manpage");
1050 exit(status);
1051
1052 puts("\nThe format modifiers for the -F option are:");
1053 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1054 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1055 puts(" i INTERP \tb BIND \ts symbol");
1056 puts(" N library \to Type \tT TEXTRELs");
1057 puts(" S SONAME");
1058 puts(" p filename (with search path removed)");
1059 puts(" f filename (short name/basename)");
1060 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1061
1062 exit(status); 1839 exit(status);
1063} 1840}
1064 1841
1065/* parse command line arguments and preform needed actions */ 1842/* parse command line arguments and preform needed actions */
1843#define do_pax_state(option, flag) \
1844 if (islower(option)) { \
1845 flags &= ~PF_##flag; \
1846 flags |= PF_NO##flag; \
1847 } else { \
1848 flags &= ~PF_NO##flag; \
1849 flags |= PF_##flag; \
1850 }
1066static void parseargs(int argc, char *argv[]) 1851static int parseargs(int argc, char *argv[])
1067{ 1852{
1068 int i; 1853 int i;
1069 char *from_file = NULL; 1854 const char *from_file = NULL;
1855 int ret = 0;
1070 1856
1071 opterr = 0; 1857 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1858 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) { 1859 switch (i) {
1074 1860
1078 VERSION, __FILE__, __DATE__, rcsid, argv0); 1864 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS); 1865 exit(EXIT_SUCCESS);
1080 break; 1866 break;
1081 case 'h': usage(EXIT_SUCCESS); break; 1867 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f': 1868 case 'f':
1083 if (from_file) err("Don't specify -f twice"); 1869 if (from_file) warn("You prob don't want to specify -f twice");
1084 from_file = xstrdup(optarg); 1870 from_file = optarg;
1871 break;
1872 case 'E':
1873 strncpy(match_etypes, optarg, sizeof(match_etypes));
1874 break;
1875 case 'M':
1876 match_bits = atoi(optarg);
1877 if (match_bits == 0) {
1878 if (strcmp(optarg, "ELFCLASS32") == 0)
1879 match_bits = 32;
1880 if (strcmp(optarg, "ELFCLASS64") == 0)
1881 match_bits = 64;
1882 }
1883 break;
1884 case 'O':
1885 if (sscanf(optarg, "%o", &match_perms) == -1)
1886 match_bits = 0;
1085 break; 1887 break;
1086 case 'o': { 1888 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1889 if (freopen(optarg, "w", stdout) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1890 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1090 SET_STDOUT(fp);
1091 break; 1891 break;
1092 } 1892 }
1093 1893 case 'k':
1894 if (find_section) warn("You prob don't want to specify -k twice");
1895 find_section = optarg;
1896 break;
1094 case 's': { 1897 case 's': {
1095 size_t len;
1096 if (find_sym) err("Don't specify -s twice"); 1898 if (find_sym) warn("You prob don't want to specify -s twice");
1097 find_sym = xstrdup(optarg); 1899 find_sym = optarg;
1098 len = strlen(find_sym) + 1;
1099 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1100 sprintf(versioned_symname, "%s@", find_sym);
1101 break; 1900 break;
1102 } 1901 }
1103 case 'N': { 1902 case 'N': {
1104 if (find_lib) err("Don't specify -N twice"); 1903 if (find_lib) warn("You prob don't want to specify -N twice");
1105 find_lib = xstrdup(optarg); 1904 find_lib = optarg;
1106 break; 1905 break;
1107 } 1906 }
1108 1907
1109 case 'F': { 1908 case 'F': {
1110 if (out_format) err("Don't specify -F twice"); 1909 if (out_format) warn("You prob don't want to specify -F twice");
1111 out_format = xstrdup(optarg); 1910 out_format = optarg;
1112 break; 1911 break;
1113 } 1912 }
1913 case 'z': {
1914 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1915 size_t x;
1114 1916
1917 for (x = 0; x < strlen(optarg); x++) {
1918 switch (optarg[x]) {
1919 case 'p':
1920 case 'P':
1921 do_pax_state(optarg[x], PAGEEXEC);
1922 break;
1923 case 's':
1924 case 'S':
1925 do_pax_state(optarg[x], SEGMEXEC);
1926 break;
1927 case 'm':
1928 case 'M':
1929 do_pax_state(optarg[x], MPROTECT);
1930 break;
1931 case 'e':
1932 case 'E':
1933 do_pax_state(optarg[x], EMUTRAMP);
1934 break;
1935 case 'r':
1936 case 'R':
1937 do_pax_state(optarg[x], RANDMMAP);
1938 break;
1939 case 'x':
1940 case 'X':
1941 do_pax_state(optarg[x], RANDEXEC);
1942 break;
1943 default:
1944 break;
1945 }
1946 }
1947 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1948 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1949 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1950 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1951 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1952 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1953 setpax = flags;
1954 break;
1955 }
1956 case 'Z': show_size = 1; break;
1115 case 'g': gmatch = 1; 1957 case 'g': g_match = 1; break;
1958 case 'L': use_ldcache = 1; break;
1116 case 'y': scan_symlink = 0; break; 1959 case 'y': scan_symlink = 0; break;
1960 case 'A': scan_archives = 1; break;
1961 case 'C': color_init(true); break;
1117 case 'B': show_banner = 0; break; 1962 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break; 1963 case 'l': scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break; 1964 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break; 1965 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break; 1966 case 'm': dir_crossmount = 0; break;
1967 case 'X': ++fix_elf; break;
1122 case 'x': show_pax = 1; break; 1968 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break; 1969 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break; 1970 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break; 1971 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break; 1972 case 'n': show_needed = 1; break;
1128 case 'b': show_bind = 1; break; 1974 case 'b': show_bind = 1; break;
1129 case 'S': show_soname = 1; break; 1975 case 'S': show_soname = 1; break;
1130 case 'T': show_textrels = 1; break; 1976 case 'T': show_textrels = 1; break;
1131 case 'q': be_quiet = 1; break; 1977 case 'q': be_quiet = 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1978 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; 1979 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
1134 1980 case 'D': show_endian = 1; break;
1981 case 'I': show_osabi = 1; break;
1982 case 'Y': show_eabi = 1; break;
1135 case ':': 1983 case ':':
1136 err("Option missing parameter\n"); 1984 err("Option '%c' is missing parameter", optopt);
1137 case '?': 1985 case '?':
1138 err("Unknown option\n"); 1986 err("Unknown option '%c' or argument missing", optopt);
1139 default: 1987 default:
1140 err("Unhandled option '%c'", i); 1988 err("Unhandled option '%c'; please report this", i);
1141 }
1142 } 1989 }
1143 1990 }
1991 if (show_textrels && be_verbose) {
1992 if (which("objdump") != NULL)
1993 has_objdump = 1;
1994 }
1144 /* let the format option override all other options */ 1995 /* let the format option override all other options */
1145 if (out_format) { 1996 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \ 1997 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \ 1998 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0; 1999 show_textrels = show_perms = show_endian = show_size = \
2000 show_osabi = show_eabi = 0;
1149 for (i = 0; out_format[i]; ++i) { 2001 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue; 2002 if (!IS_MODIFIER(out_format[i])) continue;
1151 2003
1152 switch (out_format[++i]) { 2004 switch (out_format[++i]) {
2005 case '+': break;
1153 case '%': break; 2006 case '%': break;
1154 case '#': break; 2007 case '#': break;
1155 case 'F': break; 2008 case 'F': break;
1156 case 'p': break; 2009 case 'p': break;
1157 case 'f': break; 2010 case 'f': break;
2011 case 'k': break;
1158 case 's': break; 2012 case 's': break;
1159 case 'N': break; 2013 case 'N': break;
1160 case 'o': break; 2014 case 'o': break;
2015 case 'a': break;
2016 case 'M': break;
2017 case 'Z': show_size = 1; break;
2018 case 'D': show_endian = 1; break;
2019 case 'I': show_osabi = 1; break;
2020 case 'Y': show_eabi = 1; break;
2021 case 'O': show_perms = 1; break;
1161 case 'x': show_pax = 1; break; 2022 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break; 2023 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break; 2024 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break; 2025 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break; 2026 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break; 2027 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break; 2028 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break; 2029 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break; 2030 case 'T': show_textrels = 1; break;
1170 default: 2031 default:
1171 err("Invalid format specifier '%c' (byte %i)", 2032 err("Invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1); 2033 out_format[i], i+1);
1173 } 2034 }
1174 } 2035 }
1175 2036
1176 /* construct our default format */ 2037 /* construct our default format */
1177 } else { 2038 } else {
1178 size_t fmt_len = 30; 2039 size_t fmt_len = 30;
1179 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2040 out_format = xmalloc(sizeof(char) * fmt_len);
2041 *out_format = '\0';
1180 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2042 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1181 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2043 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2044 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2045 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2046 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2047 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2048 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1182 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); 2049 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1183 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2050 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1184 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2051 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1185 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2052 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2053 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); 2054 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); 2055 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); 2056 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2057 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2058 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); 2059 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2060 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 } 2061 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format); 2062 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195 2063
1196 /* now lets actually do the scanning */ 2064 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet)) 2065 if (scan_ldpath || use_ldcache)
1198 load_ld_so_conf(); 2066 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
1199 if (scan_ldpath) scanelf_ldpath(); 2067 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath(); 2068 if (scan_envpath) scanelf_envpath();
2069 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2070 from_file = "-";
1201 if (from_file) { 2071 if (from_file) {
1202 scanelf_from_file(from_file); 2072 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv; 2073 from_file = *argv;
1205 } 2074 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 2075 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?"); 2076 err("Nothing to scan !?");
1208 while (optind < argc) { 2077 while (optind < argc) {
1209 search_path = argv[optind++]; 2078 search_path = argv[optind++];
1210 scanelf_dir(search_path); 2079 ret = scanelf_dir(search_path);
1211 } 2080 }
1212 2081
1213 /* clean up */ 2082 /* clean up */
1214 if (find_sym) {
1215 free(find_sym);
1216 free(versioned_symname);
1217 }
1218 if (find_lib) free(find_lib);
1219 if (out_format) free(out_format);
1220 for (i = 0; ldpaths[i]; ++i) 2083 for (i = 0; ldpaths[i]; ++i)
1221 free(ldpaths[i]); 2084 free(ldpaths[i]);
1222}
1223 2085
1224 2086 if (ldcache != 0)
1225 2087 munmap(ldcache, ldcache_size);
1226/* utility funcs */
1227static char *xstrdup(const char *s)
1228{
1229 char *ret = strdup(s);
1230 if (!ret) err("Could not strdup(): %s", strerror(errno));
1231 return ret; 2088 return ret;
1232} 2089}
1233 2090
1234static void *xmalloc(size_t size) 2091static char **get_split_env(const char *envvar)
1235{ 2092{
1236 void *ret = malloc(size); 2093 const char *delims = " \t\n";
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 2094 char **envvals = NULL;
1238 return ret; 2095 char *env, *s;
1239} 2096 int nentry;
1240 2097
1241static void xstrcat(char **dst, const char *src, size_t *curr_len) 2098 if ((env = getenv(envvar)) == NULL)
1242{ 2099 return NULL;
1243 size_t new_len;
1244 2100
1245 new_len = strlen(*dst) + strlen(src); 2101 env = xstrdup(env);
1246 if (*curr_len <= new_len) { 2102 if (env == NULL)
1247 *curr_len = new_len + (*curr_len / 2); 2103 return NULL;
1248 *dst = realloc(*dst, *curr_len);
1249 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len);
1251 }
1252 2104
1253 strcat(*dst, src); 2105 s = strtok(env, delims);
1254} 2106 if (s == NULL) {
2107 free(env);
2108 return NULL;
2109 }
1255 2110
1256static inline void xchrcat(char **dst, const char append, size_t *curr_len) 2111 nentry = 0;
1257{ 2112 while (s != NULL) {
1258 static char my_app[2]; 2113 ++nentry;
1259 my_app[0] = append; 2114 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1260 my_app[1] = '\0'; 2115 envvals[nentry-1] = s;
1261 xstrcat(dst, my_app, curr_len); 2116 s = strtok(NULL, delims);
1262} 2117 }
2118 envvals[nentry] = NULL;
1263 2119
2120 /* don't want to free(env) as it contains the memory that backs
2121 * the envvals array of strings */
2122 return envvals;
2123}
1264 2124
2125static void parseenv(void)
2126{
2127 color_init(false);
2128 qa_textrels = get_split_env("QA_TEXTRELS");
2129 qa_execstack = get_split_env("QA_EXECSTACK");
2130 qa_wx_load = get_split_env("QA_WX_LOAD");
2131}
2132
2133#ifdef __PAX_UTILS_CLEANUP
2134static void cleanup(void)
2135{
2136 free(out_format);
2137 free(qa_textrels);
2138 free(qa_execstack);
2139 free(qa_wx_load);
2140}
2141#endif
1265 2142
1266int main(int argc, char *argv[]) 2143int main(int argc, char *argv[])
1267{ 2144{
2145 int ret;
1268 if (argc < 2) 2146 if (argc < 2)
1269 usage(EXIT_FAILURE); 2147 usage(EXIT_FAILURE);
2148 parseenv();
1270 parseargs(argc, argv); 2149 ret = parseargs(argc, argv);
1271 fclose(stdout); 2150 fclose(stdout);
1272#ifdef __BOUNDS_CHECKING_ON 2151#ifdef __PAX_UTILS_CLEANUP
1273 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 2152 cleanup();
2153 warn("The calls to add/delete heap should be off:\n"
2154 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2155 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1274#endif 2156#endif
1275 return EXIT_SUCCESS; 2157 return ret;
1276} 2158}
2159
2160/* Match filename against entries in matchlist, return TRUE
2161 * if the file is listed */
2162static int file_matches_list(const char *filename, char **matchlist)
2163{
2164 char **file;
2165 char *match;
2166 char buf[__PAX_UTILS_PATH_MAX];
2167
2168 if (matchlist == NULL)
2169 return 0;
2170
2171 for (file = matchlist; *file != NULL; file++) {
2172 if (search_path) {
2173 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2174 match = buf;
2175 } else {
2176 match = *file;
2177 }
2178 if (fnmatch(match, filename, 0) == 0)
2179 return 1;
2180 }
2181 return 0;
2182}

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