/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.44 Revision 1.195
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 2 * Copyright 2003-2007 Gentoo Foundation
4 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.195 2008/10/22 15:20:21 flameeyes Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 * MA 02111-1307, USA.
22 */ 8 */
23 9
24#include <stdio.h> 10static const char *rcsid = "$Id: scanelf.c,v 1.195 2008/10/22 15:20:21 flameeyes Exp $";
25#include <stdlib.h> 11const char * const argv0 = "scanelf";
26#include <sys/types.h>
27#define __USE_GNU
28#include <string.h>
29#include <errno.h>
30#include <unistd.h>
31#include <sys/stat.h>
32#include <dirent.h>
33#include <getopt.h>
34#include <assert.h>
35 12
36#include "paxelf.h" 13#include "paxinc.h"
37 14
38static const char *rcsid = "$Id: scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $"; 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
39#define argv0 "scanelf"
40
41
42 16
43/* prototypes */ 17/* prototypes */
44static 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);
45static void scanelf_dir(const char *path); 23static int scanelf_dir(const char *path);
46static void scanelf_ldpath(); 24static void scanelf_ldpath(void);
47static void scanelf_envpath(); 25static void scanelf_envpath(void);
48static void usage(int status); 26static void usage(int status);
27static char **get_split_env(const char *envvar);
28static void parseenv(void);
49static void parseargs(int argc, char *argv[]); 29static int parseargs(int argc, char *argv[]);
50static char *xstrdup(char *s); 30static int rematch(const char *regex, const char *match, int cflags);
51static void *xmalloc(size_t size);
52static void xstrcat(char **dst, const char *src, size_t *curr_len);
53static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54static int xemptybuffer(const char *buff);
55 31
56/* variables to control behavior */ 32/* variables to control behavior */
33static char match_etypes[126] = "";
34static char *ldpaths[256];
57static char scan_ldpath = 0; 35static char scan_ldpath = 0;
58static char scan_envpath = 0; 36static char scan_envpath = 0;
59static char scan_symlink = 1; 37static char scan_symlink = 1;
38static char scan_archives = 0;
60static char dir_recurse = 0; 39static char dir_recurse = 0;
61static char dir_crossmount = 1; 40static char dir_crossmount = 1;
62static char show_pax = 0; 41static char show_pax = 0;
42static char show_perms = 0;
63static char show_stack = 0; 43static char show_size = 0;
44static char show_phdr = 0;
64static char show_textrel = 0; 45static char show_textrel = 0;
65static char show_rpath = 0; 46static char show_rpath = 0;
66static char show_needed = 0; 47static char show_needed = 0;
67static char show_interp = 0; 48static char show_interp = 0;
49static char show_bind = 0;
50static char show_soname = 0;
51static char show_textrels = 0;
68static char show_banner = 1; 52static char show_banner = 1;
53static char show_endian = 0;
54static char show_osabi = 0;
55static char show_eabi = 0;
69static char be_quiet = 0; 56static char be_quiet = 0;
70static char be_verbose = 0; 57static char be_verbose = 0;
58static char be_wewy_wewy_quiet = 0;
59static char be_semi_verbose = 0;
71static char *find_sym = NULL, *versioned_symname = NULL; 60static char *find_sym = NULL, *versioned_symname = NULL;
61static char *find_lib = NULL;
62static char *find_section = NULL;
72static char *out_format = NULL; 63static char *out_format = NULL;
64static char *search_path = NULL;
65static char fix_elf = 0;
66static char g_match = 0;
67static char use_ldcache = 0;
73 68
69static char **qa_textrels = NULL;
70static char **qa_execstack = NULL;
71static char **qa_wx_load = NULL;
74 72
73int match_bits = 0;
74unsigned int match_perms = 0;
75caddr_t ldcache = 0;
76size_t ldcache_size = 0;
77unsigned long setpax = 0UL;
78
79int has_objdump = 0;
80
81static char *getstr_perms(const char *fname);
82static char *getstr_perms(const char *fname)
83{
84 struct stat st;
85 static char buf[8];
86
87 if ((stat(fname, &st)) == (-1))
88 return (char *) "";
89
90 snprintf(buf, sizeof(buf), "%o", st.st_mode);
91
92 return (char *) buf + 2;
93}
94
95/* find the path to a file by name */
96static char *which(const char *fname)
97{
98 static char fullpath[BUFSIZ];
99 char *path, *p;
100
101 path = getenv("PATH");
102 if (!path)
103 return NULL;
104
105 path = xstrdup(path);
106 while ((p = strrchr(path, ':')) != NULL) {
107 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
108 *p = 0;
109 if (access(fullpath, R_OK) != (-1)) {
110 free(path);
111 return (char *) fullpath;
112 }
113 }
114 free(path);
115 return NULL;
116}
117
118/* 1 on failure. 0 otherwise */
119static int rematch(const char *regex, const char *match, int cflags)
120{
121 regex_t preg;
122 int ret;
123
124 if ((match == NULL) || (regex == NULL))
125 return EXIT_FAILURE;
126
127 if ((ret = regcomp(&preg, regex, cflags))) {
128 char err[256];
129
130 if (regerror(ret, &preg, err, sizeof(err)))
131 fprintf(stderr, "regcomp failed: %s", err);
132 else
133 fprintf(stderr, "regcomp failed");
134
135 return EXIT_FAILURE;
136 }
137 ret = regexec(&preg, match, 0, NULL, 0);
138 regfree(&preg);
139
140 return ret;
141}
75 142
76/* sub-funcs for scanelf_file() */ 143/* sub-funcs for scanelf_file() */
144static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
145{
146 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
147#define GET_SYMTABS(B) \
148 if (elf->elf_class == ELFCLASS ## B) { \
149 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
150 /* debug sections */ \
151 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
152 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
153 /* runtime sections */ \
154 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
155 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
156 if (symtab && dynsym) { \
157 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
158 } else { \
159 *sym = (void*)(symtab ? symtab : dynsym); \
160 } \
161 if (strtab && dynstr) { \
162 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
163 } else { \
164 *tab = (void*)(strtab ? strtab : dynstr); \
165 } \
166 }
167 GET_SYMTABS(32)
168 GET_SYMTABS(64)
169}
170
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 171static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 172{
79 static char *paxflags; 173 static char ret[7];
174 unsigned long i, shown;
80 175
81 if (!show_pax) return NULL; 176 if (!show_pax) return NULL;
82 177
83 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
84 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
85 *found_pax = 1;
86 return paxflags;
87 }
88
89 return NULL;
90}
91static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
92{
93 static char ret[8];
94 char *found;
95 unsigned long i, off, shown;
96
97 if (!show_stack) return NULL;
98
99 shown = 0; 178 shown = 0;
100 strcpy(ret, "--- ---"); 179 memset(&ret, 0, sizeof(ret));
101 180
102 if (elf->phdr) { 181 if (elf->phdr) {
103#define SHOW_STACK(B) \ 182#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 183 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 184 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 185 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 186 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 187 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
109 found = found_stack; \
110 off = 0; \
111 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
112 found = found_relro; \
113 off = 3; \
114 } else \
115 continue; \ 188 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 189 if (fix_elf && setpax) { \
190 /* set the paxctl flags */ \
191 ESET(phdr[i].p_flags, setpax); \
192 } \
193 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 194 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 195 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 196 *found_pax = 1; \
120 ++shown; \ 197 ++shown; \
198 break; \
121 } \ 199 } \
122 } 200 }
123 SHOW_STACK(32) 201 SHOW_PAX(32)
124 SHOW_STACK(64) 202 SHOW_PAX(64)
203 }
204
205 if (fix_elf && setpax) {
206 /* set the chpax settings */
207 if (elf->elf_class == ELFCLASS32) {
208 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
209 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
210 } else {
211 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
212 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
125 } 213 }
214 }
126 215
127 if (be_quiet && !shown) 216 /* fall back to EI_PAX if no PT_PAX was found */
217 if (!*ret) {
218 static char *paxflags;
219 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
220 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
221 *found_pax = 1;
222 return (be_wewy_wewy_quiet ? NULL : paxflags);
223 }
224 strncpy(ret, paxflags, sizeof(ret));
225 }
226
227 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 228 return NULL;
129 else 229 else
130 return ret; 230 return ret;
131} 231}
232
233static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
234{
235 static char ret[12];
236 char *found;
237 unsigned long i, shown, multi_stack, multi_relro, multi_load;
238 int max_pt_load;
239
240 if (!show_phdr) return NULL;
241
242 memcpy(ret, "--- --- ---\0", 12);
243
244 shown = 0;
245 multi_stack = multi_relro = multi_load = 0;
246 max_pt_load = elf_max_pt_load(elf);
247
248#define NOTE_GNU_STACK ".note.GNU-stack"
249#define SHOW_PHDR(B) \
250 if (elf->elf_class == ELFCLASS ## B) { \
251 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
252 Elf ## B ## _Off offset; \
253 uint32_t flags, check_flags; \
254 if (elf->phdr != NULL) { \
255 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
256 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
257 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
258 if (multi_stack++) \
259 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
260 if (file_matches_list(elf->filename, qa_execstack)) \
261 continue; \
262 found = found_phdr; \
263 offset = 0; \
264 check_flags = PF_X; \
265 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
266 if (multi_relro++) \
267 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
268 found = found_relro; \
269 offset = 4; \
270 check_flags = PF_X; \
271 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
272 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
273 if (multi_load++ > max_pt_load) \
274 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
275 if (file_matches_list(elf->filename, qa_wx_load)) \
276 continue; \
277 found = found_load; \
278 offset = 8; \
279 check_flags = PF_W|PF_X; \
280 } else \
281 continue; \
282 flags = EGET(phdr[i].p_flags); \
283 if (be_quiet && ((flags & check_flags) != check_flags)) \
284 continue; \
285 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
286 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
287 ret[3] = ret[7] = '!'; \
288 flags = EGET(phdr[i].p_flags); \
289 } \
290 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
291 *found = 1; \
292 ++shown; \
293 } \
294 } else if (elf->shdr != NULL) { \
295 /* no program headers which means this is prob an object file */ \
296 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
297 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
298 char *str; \
299 if ((void*)strtbl > (void*)elf->data_end) \
300 goto skip_this_shdr##B; \
301 check_flags = SHF_WRITE|SHF_EXECINSTR; \
302 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
303 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
304 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
305 str = elf->data + offset; \
306 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
307 if (!strcmp(str, NOTE_GNU_STACK)) { \
308 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
309 flags = EGET(shdr[i].sh_flags); \
310 if (be_quiet && ((flags & check_flags) != check_flags)) \
311 continue; \
312 ++*found_phdr; \
313 shown = 1; \
314 if (flags & SHF_WRITE) ret[0] = 'W'; \
315 if (flags & SHF_ALLOC) ret[1] = 'A'; \
316 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
317 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
318 break; \
319 } \
320 } \
321 skip_this_shdr##B: \
322 if (!multi_stack) { \
323 if (file_matches_list(elf->filename, qa_execstack)) \
324 return NULL; \
325 *found_phdr = 1; \
326 shown = 1; \
327 memcpy(ret, "!WX", 3); \
328 } \
329 } \
330 }
331 SHOW_PHDR(32)
332 SHOW_PHDR(64)
333
334 if (be_wewy_wewy_quiet || (be_quiet && !shown))
335 return NULL;
336 else
337 return ret;
338}
339
340/*
341 * See if this ELF contains a DT_TEXTREL tag in any of its
342 * PT_DYNAMIC sections.
343 */
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 344static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 345{
134 static char *ret = "TEXTREL"; 346 static const char *ret = "TEXTREL";
135 unsigned long i; 347 unsigned long i;
136 348
137 if (!show_textrel) return NULL; 349 if (!show_textrel && !show_textrels) return NULL;
350
351 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 352
139 if (elf->phdr) { 353 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 354#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 355 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 356 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 357 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 358 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 359 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 360 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 361 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
148 offset = EGET(phdr[i].p_offset); \ 362 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 363 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 364 dyn = DYN ## B (elf->data + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 365 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 366 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 367 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 368 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 369 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 370 } \
157 ++dyn; \ 371 ++dyn; \
158 } \ 372 } \
159 } } 373 } }
160 SHOW_TEXTREL(32) 374 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 375 SHOW_TEXTREL(64)
162 } 376 }
163 377
164 if (be_quiet) 378 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 379 return NULL;
166 else 380 else
167 return " - "; 381 return " - ";
168} 382}
383
384/*
385 * Scan the .text section to see if there are any relocations in it.
386 * Should rewrite this to check PT_LOAD sections that are marked
387 * Executable rather than the section named '.text'.
388 */
389static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
390{
391 unsigned long s, r, rmax;
392 void *symtab_void, *strtab_void, *text_void;
393
394 if (!show_textrels) return NULL;
395
396 /* don't search for TEXTREL's if the ELF doesn't have any */
397 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
398 if (!*found_textrel) return NULL;
399
400 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
401 text_void = elf_findsecbyname(elf, ".text");
402
403 if (symtab_void && strtab_void && text_void && elf->shdr) {
404#define SHOW_TEXTRELS(B) \
405 if (elf->elf_class == ELFCLASS ## B) { \
406 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
407 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
408 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
409 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
410 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
411 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
412 uint ## B ## _t memsz = EGET(text->sh_size); \
413 Elf ## B ## _Rel *rel; \
414 Elf ## B ## _Rela *rela; \
415 /* search the section headers for relocations */ \
416 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
417 uint32_t sh_type = EGET(shdr[s].sh_type); \
418 if (sh_type == SHT_REL) { \
419 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
420 rela = NULL; \
421 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
422 } else if (sh_type == SHT_RELA) { \
423 rel = NULL; \
424 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
425 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
426 } else \
427 continue; \
428 /* now see if any of the relocs are in the .text */ \
429 for (r = 0; r < rmax; ++r) { \
430 unsigned long sym_max; \
431 Elf ## B ## _Addr offset_tmp; \
432 Elf ## B ## _Sym *func; \
433 Elf ## B ## _Sym *sym; \
434 Elf ## B ## _Addr r_offset; \
435 uint ## B ## _t r_info; \
436 if (sh_type == SHT_REL) { \
437 r_offset = EGET(rel[r].r_offset); \
438 r_info = EGET(rel[r].r_info); \
439 } else { \
440 r_offset = EGET(rela[r].r_offset); \
441 r_info = EGET(rela[r].r_info); \
442 } \
443 /* make sure this relocation is inside of the .text */ \
444 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
445 if (be_verbose <= 2) continue; \
446 } else \
447 *found_textrels = 1; \
448 /* locate this relocation symbol name */ \
449 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
450 if ((void*)sym > (void*)elf->data_end) { \
451 warn("%s: corrupt ELF symbol", elf->filename); \
452 continue; \
453 } \
454 sym_max = ELF ## B ## _R_SYM(r_info); \
455 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
456 sym += sym_max; \
457 else \
458 sym = NULL; \
459 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
460 /* show the raw details about this reloc */ \
461 printf(" %s: ", elf->base_filename); \
462 if (sym && sym->st_name) \
463 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
464 else \
465 printf("(memory/data?)"); \
466 printf(" [0x%lX]", (unsigned long)r_offset); \
467 /* now try to find the closest symbol that this rel is probably in */ \
468 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
469 func = NULL; \
470 offset_tmp = 0; \
471 while (sym_max--) { \
472 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
473 func = sym; \
474 offset_tmp = EGET(sym->st_value); \
475 } \
476 ++sym; \
477 } \
478 printf(" in "); \
479 if (func && func->st_name) { \
480 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
481 if (r_offset > EGET(func->st_size)) \
482 printf("(optimized out: previous %s)", func_name); \
483 else \
484 printf("%s", func_name); \
485 } else \
486 printf("(optimized out)"); \
487 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
488 if (be_verbose && has_objdump) { \
489 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
490 char *sysbuf; \
491 size_t syslen; \
492 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"; \
493 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
494 sysbuf = xmalloc(syslen); \
495 if (end_addr < r_offset) \
496 /* not uncommon when things are optimized out */ \
497 end_addr = r_offset + 0x100; \
498 snprintf(sysbuf, syslen, sysfmt, \
499 (unsigned long)offset_tmp, \
500 (unsigned long)end_addr, \
501 elf->filename, \
502 (unsigned long)r_offset); \
503 fflush(stdout); \
504 system(sysbuf); \
505 fflush(stdout); \
506 free(sysbuf); \
507 } \
508 } \
509 } }
510 SHOW_TEXTRELS(32)
511 SHOW_TEXTRELS(64)
512 }
513 if (!*found_textrels)
514 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
515
516 return NULL;
517}
518
519static void rpath_security_checks(elfobj *, char *, const char *);
520static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
521{
522 struct stat st;
523 switch (*item) {
524 case '/': break;
525 case '.':
526 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
527 break;
528 case ':':
529 case '\0':
530 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
531 break;
532 case '$':
533 if (fstat(elf->fd, &st) != -1)
534 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
535 warnf("Security problem with %s='%s' in %s with mode set of %o",
536 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
537 break;
538 default:
539 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
540 break;
541 }
542}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 543static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 544{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 545 unsigned long i, s;
173 char *rpath, *runpath; 546 char *rpath, *runpath, **r;
174 void *strtbl_void; 547 void *strtbl_void;
175 548
176 if (!show_rpath) return; 549 if (!show_rpath) return;
177 550
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 551 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 557 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 558 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 559 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 560 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 561 Elf ## B ## _Off offset; \
562 Elf ## B ## _Xword word; \
563 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 564 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
565 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 566 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
191 offset = EGET(phdr[i].p_offset); \ 567 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 568 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
569 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 570 dyn = DYN ## B (elf->data + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 571 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 572 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 573 r = &rpath; \
574 } else if (word == DT_RUNPATH) { \
575 r = &runpath; \
576 } else { \
577 ++dyn; \
578 continue; \
579 } \
580 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 581 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 582 if (offset < (Elf ## B ## _Off)elf->len) { \
583 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 584 *r = (char*)(elf->data + offset); \
585 /* cache the length in case we need to nuke this section later on */ \
586 if (fix_elf) \
587 offset = strlen(*r); \
588 /* If quiet, don't output paths in ld.so.conf */ \
589 if (be_quiet) { \
590 size_t len; \
591 char *start, *end; \
592 /* note that we only 'chop' off leading known paths. */ \
593 /* since *r is read-only memory, we can only move the ptr forward. */ \
594 start = *r; \
595 /* scan each path in : delimited list */ \
596 while (start) { \
597 rpath_security_checks(elf, start, get_elfdtype(word)); \
598 end = strchr(start, ':'); \
599 len = (end ? abs(end - start) : strlen(start)); \
600 if (use_ldcache) \
601 for (s = 0; ldpaths[s]; ++s) \
602 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
603 *r = end; \
604 /* corner case ... if RPATH reads "/usr/lib:", we want \
605 * to show ':' rather than '' */ \
606 if (end && end[1] != '\0') \
607 (*r)++; \
608 break; \
609 } \
610 if (!*r || !end) \
611 break; \
612 else \
613 start = start + len + 1; \
614 } \
615 } \
616 if (*r) { \
617 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
618 /* just nuke it */ \
619 nuke_it##B: \
620 memset(*r, 0x00, offset); \
621 *r = NULL; \
622 ESET(dyn->d_tag, DT_DEBUG); \
623 ESET(dyn->d_un.d_ptr, 0); \
624 } else if (fix_elf) { \
625 /* try to clean "bad" paths */ \
626 size_t len, tmpdir_len; \
627 char *start, *end; \
628 const char *tmpdir; \
629 start = *r; \
630 tmpdir = (getenv("TMPDIR") ? : "."); \
631 tmpdir_len = strlen(tmpdir); \
632 while (1) { \
633 end = strchr(start, ':'); \
634 if (start == end) { \
635 eat_this_path##B: \
636 len = strlen(end); \
637 memmove(start, end+1, len); \
638 start[len-1] = '\0'; \
639 end = start - 1; \
640 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
641 if (!end) { \
642 if (start == *r) \
643 goto nuke_it##B; \
644 *--start = '\0'; \
645 } else \
646 goto eat_this_path##B; \
647 } \
648 if (!end) \
649 break; \
650 start = end + 1; \
651 } \
652 if (**r == '\0') \
653 goto nuke_it##B; \
654 } \
655 if (*r) \
200 *found_rpath = 1; \ 656 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 657 } \
202 if (runpath) warn("ELF has multiple DT_RUNPATH's !?"); \
203 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
204 if (offset >= elf->len) continue; \
205 runpath = (char*)(elf->data + offset); \
206 *found_rpath = 1; \
207 } \ 658 } \
208 ++dyn; \ 659 ++dyn; \
209 } \ 660 } \
210 } } 661 } }
211 SHOW_RPATH(32) 662 SHOW_RPATH(32)
212 SHOW_RPATH(64) 663 SHOW_RPATH(64)
213 } 664 }
665
666 if (be_wewy_wewy_quiet) return;
214 667
215 if (rpath && runpath) { 668 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 669 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 670 xstrcat(ret, runpath, ret_len);
218 } else { 671 } else {
226 } else if (rpath || runpath) 679 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 680 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 681 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 682 xstrcat(ret, " - ", ret_len);
230} 683}
684
685#define LDSO_CACHE_MAGIC "ld.so-"
686#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
687#define LDSO_CACHE_VER "1.7.0"
688#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
689#define FLAG_ANY -1
690#define FLAG_TYPE_MASK 0x00ff
691#define FLAG_LIBC4 0x0000
692#define FLAG_ELF 0x0001
693#define FLAG_ELF_LIBC5 0x0002
694#define FLAG_ELF_LIBC6 0x0003
695#define FLAG_REQUIRED_MASK 0xff00
696#define FLAG_SPARC_LIB64 0x0100
697#define FLAG_IA64_LIB64 0x0200
698#define FLAG_X8664_LIB64 0x0300
699#define FLAG_S390_LIB64 0x0400
700#define FLAG_POWERPC_LIB64 0x0500
701#define FLAG_MIPS64_LIBN32 0x0600
702#define FLAG_MIPS64_LIBN64 0x0700
703
704static char *lookup_cache_lib(elfobj *, char *);
705
706#if defined(__GLIBC__) || defined(__UCLIBC__)
707
708static char *lookup_cache_lib(elfobj *elf, char *fname)
709{
710 int fd = 0;
711 char *strs;
712 static char buf[__PAX_UTILS_PATH_MAX] = "";
713 const char *cachefile = "/etc/ld.so.cache";
714 struct stat st;
715
716 typedef struct {
717 char magic[LDSO_CACHE_MAGIC_LEN];
718 char version[LDSO_CACHE_VER_LEN];
719 int nlibs;
720 } header_t;
721 header_t *header;
722
723 typedef struct {
724 int flags;
725 int sooffset;
726 int liboffset;
727 } libentry_t;
728 libentry_t *libent;
729
730 if (fname == NULL)
731 return NULL;
732
733 if (ldcache == 0) {
734 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
735 return NULL;
736
737 /* cache these values so we only map/unmap the cache file once */
738 ldcache_size = st.st_size;
739 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
740
741 close(fd);
742
743 if (ldcache == (caddr_t)-1) {
744 ldcache = 0;
745 return NULL;
746 }
747
748 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
749 return NULL;
750 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
751 return NULL;
752 }
753
754 header = (header_t *) ldcache;
755 libent = (libentry_t *) (ldcache + sizeof(header_t));
756 strs = (char *) &libent[header->nlibs];
757
758 for (fd = 0; fd < header->nlibs; fd++) {
759 /* this should be more fine grained, but for now we assume that
760 * diff arches will not be cached together. and we ignore the
761 * the different multilib mips cases. */
762 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
763 continue;
764 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
765 continue;
766
767 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
768 continue;
769 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
770 }
771 return buf;
772}
773#elif defined(__NetBSD__)
774static char *lookup_cache_lib(elfobj *elf, char *fname)
775{
776 static char buf[__PAX_UTILS_PATH_MAX] = "";
777 static struct stat st;
778
779 char **ldpath;
780 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
781 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
782 continue; /* if the pathname is too long, or something went wrong, ignore */
783
784 if (stat(buf, &st) != 0)
785 continue; /* if the lib doesn't exist in *ldpath, look further */
786
787 /* NetBSD doesn't actually do sanity checks, it just loads the file
788 * and if that doesn't work, continues looking in other directories.
789 * This cannot easily be safely emulated, unfortunately. For now,
790 * just assume that if it exists, it's a valid library. */
791
792 return buf;
793 }
794
795 /* not found in any path */
796 return NULL;
797}
798#else
799#ifdef __ELF__
800#warning Cache support not implemented for your target
801#endif
802static char *lookup_cache_lib(elfobj *elf, char *fname)
803{
804 return NULL;
805}
806#endif
807
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 808static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 809{
233 unsigned long i; 810 unsigned long i;
234 char *needed; 811 char *needed;
235 void *strtbl_void; 812 void *strtbl_void;
813 char *p;
236 814
237 if (!show_needed) return; 815 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
238 816
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 817 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 818
241 if (elf->phdr && strtbl_void) { 819 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 820#define SHOW_NEEDED(B) \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 823 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 824 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 825 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
248 Elf ## B ## _Off offset; \ 826 Elf ## B ## _Off offset; \
249 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 827 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
250 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 828 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
251 offset = EGET(phdr[i].p_offset); \ 829 offset = EGET(phdr[i].p_offset); \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 830 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
253 dyn = DYN ## B (elf->data + offset); \ 831 dyn = DYN ## B (elf->data + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 832 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 833 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 834 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 835 if (offset >= (Elf ## B ## _Off)elf->len) { \
836 ++dyn; \
837 continue; \
838 } \
258 needed = (char*)(elf->data + offset); \ 839 needed = (char*)(elf->data + offset); \
840 if (op == 0) { \
841 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 842 if (*found_needed) xchrcat(ret, ',', ret_len); \
843 if (use_ldcache) \
844 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
845 needed = p; \
260 xstrcat(ret, needed, ret_len); \ 846 xstrcat(ret, needed, ret_len); \
847 } \
261 *found_needed = 1; \ 848 *found_needed = 1; \
849 } else { \
850 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
851 *found_lib = 1; \
852 return (be_wewy_wewy_quiet ? NULL : needed); \
853 } \
854 } \
262 } \ 855 } \
263 ++dyn; \ 856 ++dyn; \
264 } \ 857 } \
265 } } 858 } }
266 SHOW_NEEDED(32) 859 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 860 SHOW_NEEDED(64)
861 if (op == 0 && !*found_needed && be_verbose)
862 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 863 }
864
865 return NULL;
269} 866}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 867static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 868{
272 void *strtbl_void; 869 void *strtbl_void;
273 870
278 if (strtbl_void) { 875 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 876#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 877 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 878 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 879 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 880 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 881 }
285 SHOW_INTERP(32) 882 SHOW_INTERP(32)
286 SHOW_INTERP(64) 883 SHOW_INTERP(64)
287 } 884 }
288 return NULL; 885 return NULL;
289} 886}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 887static char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 888{
292 unsigned long i; 889 unsigned long i;
890 struct stat s;
891 char dynamic = 0;
892
893 if (!show_bind) return NULL;
894 if (!elf->phdr) return NULL;
895
896#define SHOW_BIND(B) \
897 if (elf->elf_class == ELFCLASS ## B) { \
898 Elf ## B ## _Dyn *dyn; \
899 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
900 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
901 Elf ## B ## _Off offset; \
902 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
903 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
904 dynamic = 1; \
905 offset = EGET(phdr[i].p_offset); \
906 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
907 dyn = DYN ## B (elf->data + offset); \
908 while (EGET(dyn->d_tag) != DT_NULL) { \
909 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
910 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
911 { \
912 if (be_quiet) return NULL; \
913 *found_bind = 1; \
914 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
915 } \
916 ++dyn; \
917 } \
918 } \
919 }
920 SHOW_BIND(32)
921 SHOW_BIND(64)
922
923 if (be_wewy_wewy_quiet) return NULL;
924
925 /* don't output anything if quiet mode and the ELF is static or not setuid */
926 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
927 return NULL;
928 } else {
929 *found_bind = 1;
930 return (char *) (dynamic ? "LAZY" : "STATIC");
931 }
932}
933static char *scanelf_file_soname(elfobj *elf, char *found_soname)
934{
935 unsigned long i;
936 char *soname;
937 void *strtbl_void;
938
939 if (!show_soname) return NULL;
940
941 strtbl_void = elf_findsecbyname(elf, ".dynstr");
942
943 if (elf->phdr && strtbl_void) {
944#define SHOW_SONAME(B) \
945 if (elf->elf_class == ELFCLASS ## B) { \
946 Elf ## B ## _Dyn *dyn; \
947 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
948 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
949 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
950 Elf ## B ## _Off offset; \
951 /* only look for soname in shared objects */ \
952 if (EGET(ehdr->e_type) != ET_DYN) \
953 return NULL; \
954 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
955 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
956 offset = EGET(phdr[i].p_offset); \
957 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
958 dyn = DYN ## B (elf->data + offset); \
959 while (EGET(dyn->d_tag) != DT_NULL) { \
960 if (EGET(dyn->d_tag) == DT_SONAME) { \
961 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
962 if (offset >= (Elf ## B ## _Off)elf->len) { \
963 ++dyn; \
964 continue; \
965 } \
966 soname = (char*)(elf->data + offset); \
967 *found_soname = 1; \
968 return (be_wewy_wewy_quiet ? NULL : soname); \
969 } \
970 ++dyn; \
971 } \
972 } }
973 SHOW_SONAME(32)
974 SHOW_SONAME(64)
975 }
976
977 return NULL;
978}
979
980static char *scanelf_file_sym(elfobj *elf, char *found_sym)
981{
982 unsigned long i;
983 char *ret;
293 void *symtab_void, *strtab_void; 984 void *symtab_void, *strtab_void;
294 985
295 if (!find_sym) return NULL; 986 if (!find_sym) return NULL;
987 ret = find_sym;
296 988
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 989 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 990
300 if (symtab_void && strtab_void) { 991 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 992#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 993 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 994 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 995 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 996 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 997 unsigned long cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 998 char *symname; \
999 if (cnt) \
1000 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 1001 for (i = 0; i < cnt; ++i) { \
1002 if ( (void*)sym > (void*)elf->data_end ) { \
1003 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1004 goto break_out; \
1005 } \
309 if (sym->st_name) { \ 1006 if (sym->st_name) { \
1007 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1008 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
311 if (*find_sym == '*') { \ 1009 if ((void*)symname > (void*)elf->data_end) { \
1010 warnf("%s: corrupt ELF symbols", elf->filename); \
1011 ++sym; \
1012 continue; \
1013 } \
1014 /* debug display ... show all symbols and some extra info */ \
1015 if (g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
312 printf("%s(%s) %5lX %15s %s\n", \ 1016 printf("%s(%s) %5lX %15s %s %s\n", \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1017 ((*found_sym == 0) ? "\n\t" : "\t"), \
314 (char *)basename(filename), \ 1018 elf->base_filename, \
315 (long)sym->st_size, \ 1019 (unsigned long)sym->st_size, \
316 (char *)get_elfstttype(sym->st_info), \ 1020 get_elfstttype(sym->st_info), \
317 symname); \ 1021 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
318 *found_sym = 1; \ 1022 *found_sym = 1; \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 1023 } else { \
320 (strcmp(symname, versioned_symname) == 0)) \ 1024 /* allow the user to specify a comma delimited list of symbols to search for */ \
1025 char *this_sym, *this_sym_ver, *next_sym; \
1026 this_sym = ret; \
1027 this_sym_ver = versioned_symname; \
1028 do { \
1029 next_sym = strchr(this_sym, ','); \
1030 if (next_sym == NULL) \
1031 next_sym = this_sym + strlen(this_sym); \
1032 /* do we want a defined symbol ? */ \
1033 if (*this_sym == '+') { \
1034 if (sym->st_shndx == SHN_UNDEF) \
1035 goto skip_this_sym##B; \
1036 ++this_sym; \
1037 ++this_sym_ver; \
1038 /* do we want an undefined symbol ? */ \
1039 } else if (*this_sym == '-') { \
1040 if (sym->st_shndx != SHN_UNDEF) \
1041 goto skip_this_sym##B; \
1042 ++this_sym; \
1043 ++this_sym_ver; \
1044 } \
1045 /* ok, lets compare the name now */ \
1046 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
1047 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
1048 if (be_semi_verbose) { \
1049 char buf[126]; \
1050 snprintf(buf, sizeof(buf), "%lX %s %s", \
1051 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1052 ret = buf; \
1053 } else \
1054 ret = this_sym; \
321 (*found_sym)++; \ 1055 (*found_sym)++; \
1056 goto break_out; \
1057 } \
1058 skip_this_sym##B: this_sym = next_sym + 1; \
1059 } while (*next_sym != '\0'); \
1060 } \
322 } \ 1061 } \
323 ++sym; \ 1062 ++sym; \
324 } } 1063 } }
325 FIND_SYM(32) 1064 FIND_SYM(32)
326 FIND_SYM(64) 1065 FIND_SYM(64)
327 } 1066 }
1067
1068break_out:
1069 if (be_wewy_wewy_quiet) return NULL;
1070
328 if (*find_sym != '*' && *found_sym) 1071 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1072 return ret;
330 if (be_quiet) 1073 if (be_quiet)
331 return NULL; 1074 return NULL;
332 else 1075 else
333 return " - "; 1076 return (char *)" - ";
334} 1077}
1078
1079static char *scanelf_file_sections(elfobj *elf, char *found_section)
1080{
1081 if (!find_section)
1082 return NULL;
1083
1084#define FIND_SECTION(B) \
1085 if (elf->elf_class == ELFCLASS ## B) { \
1086 int invert; \
1087 Elf ## B ## _Shdr *section; \
1088 invert = (*find_section == '!' ? 1 : 0); \
1089 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1090 if ((section == NULL && invert) || (section != NULL && !invert)) \
1091 *found_section = 1; \
1092 }
1093 FIND_SECTION(32)
1094 FIND_SECTION(64)
1095
1096 if (be_wewy_wewy_quiet)
1097 return NULL;
1098
1099 if (*found_section)
1100 return find_section;
1101
1102 if (be_quiet)
1103 return NULL;
1104 else
1105 return (char *)" - ";
1106}
1107
335/* scan an elf file and show all the fun stuff */ 1108/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1109#define prints(str) write(fileno(stdout), str, strlen(str))
337static void scanelf_file(const char *filename) 1110static int scanelf_elfobj(elfobj *elf)
338{ 1111{
339 unsigned long i; 1112 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1113 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1114 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1115 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1116 static char *out_buffer = NULL;
346 static size_t out_len; 1117 static size_t out_len;
347 1118
348 /* make sure 'filename' exists */
349 if (lstat(filename, &st) == -1) {
350 if (be_verbose > 2) printf("%s: does not exist\n", filename);
351 return;
352 }
353 /* always handle regular files and handle symlinked files if no -y */
354 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
355 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
356 return;
357 }
358
359 found_pax = found_stack = found_relro = found_textrel = \ 1119 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1120 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1121 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1122
363 /* verify this is real ELF */
364 if ((elf = readelf(filename)) == NULL) {
365 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
366 return;
367 }
368
369 if (be_verbose > 1) 1123 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1124 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1125 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1126 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1127 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1128 printf("%s: scanning file\n", elf->filename);
375 1129
376 /* init output buffer */ 1130 /* init output buffer */
377 if (!out_buffer) { 1131 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1132 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1133 out_buffer = xmalloc(out_len);
380 } 1134 }
381 *out_buffer = '\0'; 1135 *out_buffer = '\0';
382 1136
383 /* show the header */ 1137 /* show the header */
384 if (!be_quiet && show_banner) { 1138 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1139 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1140 if (!IS_MODIFIER(out_format[i])) continue;
387 1141
388 switch (out_format[++i]) { 1142 switch (out_format[++i]) {
1143 case '+': break;
389 case '%': break; 1144 case '%': break;
1145 case '#': break;
1146 case 'F':
1147 case 'p':
390 case 'F': prints("FILE "); break; 1148 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1149 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1150 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1151 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1152 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1153 case 'r': prints("RPATH "); break;
1154 case 'M': prints("CLASS "); break;
396 case 'n': prints("NEEDED "); break; 1155 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1156 case 'i': prints("INTERP "); break;
1157 case 'b': prints("BIND "); break;
1158 case 'Z': prints("SIZE "); break;
1159 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1160 case 's': prints("SYM "); break;
1161 case 'N': prints("LIB "); break;
1162 case 'T': prints("TEXTRELS "); break;
1163 case 'k': prints("SECTION "); break;
1164 case 'a': prints("ARCH "); break;
1165 case 'I': prints("OSABI "); break;
1166 case 'Y': prints("EABI "); break;
1167 case 'O': prints("PERM "); break;
1168 case 'D': prints("ENDIAN "); break;
1169 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1170 }
400 } 1171 }
1172 if (!found_file) prints("FILE ");
401 prints("\n"); 1173 prints("\n");
1174 found_file = 0;
402 show_banner = 0; 1175 show_banner = 0;
403 } 1176 }
404 1177
405 /* dump all the good stuff */ 1178 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1179 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1180 const char *out;
408 1181 const char *tmp;
409 /* make sure we trim leading spaces in quiet mode */ 1182 static char ubuf[sizeof(unsigned long)*2];
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 1183 if (!IS_MODIFIER(out_format[i])) {
411 *out_buffer = '\0';
412
413 if (out_format[i] != '%') {
414 xchrcat(&out_buffer, out_format[i], &out_len); 1184 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1185 continue;
416 } 1186 }
417 1187
418 out = NULL; 1188 out = NULL;
1189 be_wewy_wewy_quiet = (out_format[i] == '#');
1190 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1191 switch (out_format[++i]) {
1192 case '+':
1193 case '%':
1194 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1195 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1196 case 'F':
1197 found_file = 1;
1198 if (be_wewy_wewy_quiet) break;
1199 xstrcat(&out_buffer, elf->filename, &out_len);
1200 break;
1201 case 'p':
1202 found_file = 1;
1203 if (be_wewy_wewy_quiet) break;
1204 tmp = elf->filename;
1205 if (search_path) {
1206 ssize_t len_search = strlen(search_path);
1207 ssize_t len_file = strlen(elf->filename);
1208 if (!strncmp(elf->filename, search_path, len_search) && \
1209 len_file > len_search)
1210 tmp += len_search;
1211 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1212 }
1213 xstrcat(&out_buffer, tmp, &out_len);
1214 break;
1215 case 'f':
1216 found_file = 1;
1217 if (be_wewy_wewy_quiet) break;
1218 tmp = strrchr(elf->filename, '/');
1219 tmp = (tmp == NULL ? elf->filename : tmp+1);
1220 xstrcat(&out_buffer, tmp, &out_len);
1221 break;
422 case 'o': out = get_elfetype(elf); break; 1222 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1223 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1224 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
425 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1225 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1226 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
426 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1227 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1228 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1229 case 'D': out = get_endian(elf); break;
1230 case 'O': out = getstr_perms(elf->filename); break;
1231 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1232 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
428 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1233 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1234 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1235 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1236 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1237 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1238 case 'a': out = get_elfemtype(elf); break;
1239 case 'I': out = get_elfosabi(elf); break;
1240 case 'Y': out = get_elf_eabi(elf); break;
1241 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1242 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1243 }
1244 if (out) {
1245 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1246 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1247 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1248 else
431 if (out) xstrcat(&out_buffer, out, &out_len); 1249 xstrcat(&out_buffer, out, &out_len);
432 } 1250 }
1251 }
433 1252
434 if (!found_file) { 1253#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1254 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1255 found_rpath || found_needed || found_interp || found_bind || \
1256 found_soname || found_sym || found_lib || found_textrels || found_section )
1257
1258 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1259 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1260 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1261 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1262 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1263 puts(out_buffer);
1264 fflush(stdout);
1265 }
441 1266
1267 return 0;
1268}
1269
1270/* scan a single elf */
1271static int scanelf_elf(const char *filename, int fd, size_t len)
1272{
1273 int ret = 1;
1274 elfobj *elf;
1275
1276 /* verify this is real ELF */
1277 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1278 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1279 return ret;
1280 }
1281 switch (match_bits) {
1282 case 32:
1283 if (elf->elf_class != ELFCLASS32)
1284 goto label_done;
1285 break;
1286 case 64:
1287 if (elf->elf_class != ELFCLASS64)
1288 goto label_done;
1289 break;
1290 default: break;
1291 }
1292 if (strlen(match_etypes)) {
1293 char sbuf[126];
1294 strncpy(sbuf, match_etypes, sizeof(sbuf));
1295 if (strchr(match_etypes, ',') != NULL) {
1296 char *p;
1297 while ((p = strrchr(sbuf, ',')) != NULL) {
1298 *p = 0;
1299 if (etype_lookup(p+1) == get_etype(elf))
1300 goto label_ret;
1301 }
1302 }
1303 if (etype_lookup(sbuf) != get_etype(elf))
1304 goto label_done;
1305 }
1306
1307label_ret:
1308 ret = scanelf_elfobj(elf);
1309
1310label_done:
442 unreadelf(elf); 1311 unreadelf(elf);
1312 return ret;
1313}
1314
1315/* scan an archive of elfs */
1316static int scanelf_archive(const char *filename, int fd, size_t len)
1317{
1318 archive_handle *ar;
1319 archive_member *m;
1320 char *ar_buffer;
1321 elfobj *elf;
1322
1323 ar = ar_open_fd(filename, fd);
1324 if (ar == NULL)
1325 return 1;
1326
1327 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1328 while ((m=ar_next(ar)) != NULL) {
1329 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1330 if (elf) {
1331 scanelf_elfobj(elf);
1332 unreadelf(elf);
1333 }
1334 }
1335 munmap(ar_buffer, len);
1336
1337 return 0;
1338}
1339/* scan a file which may be an elf or an archive or some other magical beast */
1340static int scanelf_file(const char *filename, const struct stat *st_cache)
1341{
1342 const struct stat *st = st_cache;
1343 struct stat symlink_st;
1344 int fd;
1345
1346 /* always handle regular files and handle symlinked files if no -y */
1347 if (S_ISLNK(st->st_mode)) {
1348 if (!scan_symlink) return 1;
1349 stat(filename, &symlink_st);
1350 st = &symlink_st;
1351 }
1352
1353 if (!S_ISREG(st->st_mode)) {
1354 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1355 return 1;
1356 }
1357
1358 if (match_perms) {
1359 if ((st->st_mode | match_perms) != st->st_mode)
1360 return 1;
1361 }
1362 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1363 return 1;
1364
1365 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1366 /* if it isn't an ELF, maybe it's an .a archive */
1367 scanelf_archive(filename, fd, st->st_size);
1368
1369 close(fd);
1370 return 0;
443} 1371}
444 1372
445/* scan a directory for ET_EXEC files and print when we find one */ 1373/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1374static int scanelf_dir(const char *path)
447{ 1375{
448 register DIR *dir; 1376 register DIR *dir;
449 register struct dirent *dentry; 1377 register struct dirent *dentry;
450 struct stat st_top, st; 1378 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1379 char buf[__PAX_UTILS_PATH_MAX];
452 size_t pathlen = 0, len = 0; 1380 size_t pathlen = 0, len = 0;
1381 int ret = 0;
453 1382
454 /* make sure path exists */ 1383 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1384 if (lstat(path, &st_top) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1385 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1386 return 1;
458 } 1387 }
459 1388
460 /* ok, if it isn't a directory, assume we can open it */ 1389 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1390 if (!S_ISDIR(st_top.st_mode)) {
462 scanelf_file(path); 1391 return scanelf_file(path, &st_top);
463 return;
464 } 1392 }
465 1393
466 /* now scan the dir looking for fun stuff */ 1394 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1395 if ((dir = opendir(path)) == NULL) {
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1396 warnf("could not opendir %s: %s", path, strerror(errno));
469 return; 1397 return 1;
470 } 1398 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1399 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1400
473 pathlen = strlen(path); 1401 pathlen = strlen(path);
474 while ((dentry = readdir(dir))) { 1402 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1403 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1404 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1405 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
478 if (len >= sizeof(buf)) { 1406 if (len >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1407 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1408 (unsigned long)len, (unsigned long)sizeof(buf));
480 continue; 1409 continue;
481 } 1410 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1411 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
483 if (lstat(buf, &st) != -1) { 1412 if (lstat(buf, &st) != -1) {
484 if (S_ISREG(st.st_mode)) 1413 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1414 ret = scanelf_file(buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1415 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1416 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1417 ret = scanelf_dir(buf);
489 } 1418 }
490 } 1419 }
491 } 1420 }
492 closedir(dir); 1421 closedir(dir);
1422 return ret;
493} 1423}
1424
1425static int scanelf_from_file(const char *filename)
1426{
1427 FILE *fp = NULL;
1428 char *p;
1429 char path[__PAX_UTILS_PATH_MAX];
1430 int ret = 0;
1431
1432 if (strcmp(filename, "-") == 0)
1433 fp = stdin;
1434 else if ((fp = fopen(filename, "r")) == NULL)
1435 return 1;
1436
1437 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1438 if ((p = strchr(path, '\n')) != NULL)
1439 *p = 0;
1440 search_path = path;
1441 ret = scanelf_dir(path);
1442 }
1443 if (fp != stdin)
1444 fclose(fp);
1445 return ret;
1446}
1447
1448#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1449
1450static int load_ld_cache_config(int i, const char *fname)
1451{
1452 FILE *fp = NULL;
1453 char *p;
1454 char path[__PAX_UTILS_PATH_MAX];
1455
1456 if (i + 1 == ARRAY_SIZE(ldpaths))
1457 return i;
1458
1459 if ((fp = fopen(fname, "r")) == NULL)
1460 return i;
1461
1462 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1463 if ((p = strrchr(path, '\r')) != NULL)
1464 *p = 0;
1465 if ((p = strchr(path, '\n')) != NULL)
1466 *p = 0;
1467#ifdef __linux__
1468 /* recursive includes of the same file will make this segfault. */
1469 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1470 glob64_t gl;
1471 size_t x;
1472 char gpath[__PAX_UTILS_PATH_MAX];
1473
1474 memset(gpath, 0, sizeof(gpath));
1475
1476 if (path[8] != '/')
1477 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1478 else
1479 strncpy(gpath, &path[8], sizeof(gpath));
1480
1481 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1482 for (x = 0; x < gl.gl_pathc; ++x) {
1483 /* try to avoid direct loops */
1484 if (strcmp(gl.gl_pathv[x], fname) == 0)
1485 continue;
1486 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1487 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1488 globfree64(&gl);
1489 return i;
1490 }
1491 }
1492 globfree64 (&gl);
1493 continue;
1494 }
1495 }
1496#endif
1497 if (*path != '/')
1498 continue;
1499
1500 ldpaths[i++] = xstrdup(path);
1501
1502 if (i + 1 == ARRAY_SIZE(ldpaths))
1503 break;
1504 }
1505 ldpaths[i] = NULL;
1506
1507 fclose(fp);
1508 return i;
1509}
1510
1511#elif defined(__FreeBSD__) || (__DragonFly__)
1512
1513static int load_ld_cache_config(int i, const char *fname)
1514{
1515 FILE *fp = NULL;
1516 char *b = NULL, *p;
1517 struct elfhints_hdr hdr;
1518
1519 if (i + 1 == ARRAY_SIZE(ldpaths))
1520 return i;
1521
1522 if ((fp = fopen(fname, "r")) == NULL)
1523 return i;
1524
1525 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1526 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1527 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1528 {
1529 fclose(fp);
1530 return i;
1531 }
1532
1533 b = xmalloc(hdr.dirlistlen + 1);
1534 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1535 fclose(fp);
1536 free(b);
1537 return i;
1538 }
1539
1540 while ((p = strsep(&b, ":"))) {
1541 if (*p == '\0') continue;
1542 ldpaths[i++] = xstrdup(p);
1543
1544 if (i + 1 == ARRAY_SIZE(ldpaths))
1545 break;
1546 }
1547 ldpaths[i] = NULL;
1548
1549 free(b);
1550 fclose(fp);
1551 return i;
1552}
1553
1554#else
1555#ifdef __ELF__
1556#warning Cache config support not implemented for your target
1557#endif
1558static int load_ld_cache_config(int i, const char *fname)
1559{
1560 memset(ldpaths, 0x00, sizeof(ldpaths));
1561 return 0;
1562}
1563#endif
494 1564
495/* scan /etc/ld.so.conf for paths */ 1565/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1566static void scanelf_ldpath(void)
497{ 1567{
498 char scan_l, scan_ul, scan_ull; 1568 char scan_l, scan_ul, scan_ull;
499 char *path, *p; 1569 int i = 0;
500 FILE *fp;
501 1570
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1571 if (!ldpaths[0])
503 err("Unable to open ld.so.conf: %s", strerror(errno)); 1572 err("Unable to load any paths from ld.so.conf");
504 1573
505 scan_l = scan_ul = scan_ull = 0; 1574 scan_l = scan_ul = scan_ull = 0;
506 1575
507 path = (char*)xmalloc(_POSIX_PATH_MAX); 1576 while (ldpaths[i]) {
508 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
509 if (*path == '/') {
510 if ((p = strrchr(path, '\r')) != NULL)
511 *p = 0;
512 if ((p = strrchr(path, '\n')) != NULL)
513 *p = 0;
514 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1; 1577 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
515 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1578 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
516 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1579 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
517 scanelf_dir(path); 1580 scanelf_dir(ldpaths[i]);
1581 ++i;
518 } 1582 }
519 free(path);
520 fclose(fp);
521 1583
522 if (!scan_l) scanelf_dir("/lib"); 1584 if (!scan_l) scanelf_dir("/lib");
523 if (!scan_ul) scanelf_dir("/usr/lib"); 1585 if (!scan_ul) scanelf_dir("/usr/lib");
524 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1586 if (!scan_ull) scanelf_dir("/usr/local/lib");
525} 1587}
526 1588
527/* scan env PATH for paths */ 1589/* scan env PATH for paths */
528static void scanelf_envpath() 1590static void scanelf_envpath(void)
529{ 1591{
530 char *path, *p; 1592 char *path, *p;
531 1593
532 path = getenv("PATH"); 1594 path = getenv("PATH");
533 if (!path) 1595 if (!path)
540 } 1602 }
541 1603
542 free(path); 1604 free(path);
543} 1605}
544 1606
545 1607/* usage / invocation handling functions */ /* Free Flags: c d j u w C G H J K P Q U W */
546
547/* usage / invocation handling functions */
548#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 1608#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZBhV"
549#define a_argument required_argument 1609#define a_argument required_argument
550static struct option const long_opts[] = { 1610static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1611 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1612 {"ldpath", no_argument, NULL, 'l'},
553 {"recursive", no_argument, NULL, 'R'}, 1613 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1614 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1615 {"symlink", no_argument, NULL, 'y'},
1616 {"archives", no_argument, NULL, 'A'},
1617 {"ldcache", no_argument, NULL, 'L'},
1618 {"fix", no_argument, NULL, 'X'},
1619 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1620 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1621 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1622 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1623 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1624 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1625 {"interp", no_argument, NULL, 'i'},
1626 {"bind", no_argument, NULL, 'b'},
1627 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1628 {"symbol", a_argument, NULL, 's'},
1629 {"section", a_argument, NULL, 'k'},
1630 {"lib", a_argument, NULL, 'N'},
1631 {"gmatch", no_argument, NULL, 'g'},
1632 {"textrels", no_argument, NULL, 'T'},
1633 {"etype", a_argument, NULL, 'E'},
1634 {"bits", a_argument, NULL, 'M'},
1635 {"endian", no_argument, NULL, 'D'},
1636 {"osabi", no_argument, NULL, 'I'},
1637 {"eabi", no_argument, NULL, 'Y'},
1638 {"perms", a_argument, NULL, 'O'},
1639 {"size", no_argument, NULL, 'Z'},
563 {"all", no_argument, NULL, 'a'}, 1640 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1641 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1642 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1643 {"format", a_argument, NULL, 'F'},
1644 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1645 {"file", a_argument, NULL, 'o'},
568 {"nobanner", no_argument, NULL, 'B'}, 1646 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1647 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1648 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1649 {NULL, no_argument, NULL, 0x0}
572}; 1650};
1651
573static char *opts_help[] = { 1652static const char *opts_help[] = {
574 "Scan all directories in PATH environment", 1653 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1654 "Scan all directories in /etc/ld.so.conf",
576 "Scan directories recursively", 1655 "Scan directories recursively",
577 "Don't recursively cross mount points", 1656 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1657 "Don't scan symlinks",
1658 "Scan archives (.a files)",
1659 "Utilize ld.so.cache information (use with -r/-n)",
1660 "Try and 'fix' bad things (use with -r/-e)",
1661 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 1662 "Print PaX markings",
580 "Print GNU_STACK markings", 1663 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 1664 "Print TEXTREL information",
582 "Print RPATH information", 1665 "Print RPATH information",
583 "Print NEEDED information", 1666 "Print NEEDED information",
584 "Print INTERP information", 1667 "Print INTERP information",
1668 "Print BIND information",
1669 "Print SONAME information",
585 "Find a specified symbol", 1670 "Find a specified symbol",
1671 "Find a specified section",
1672 "Find a specified library",
1673 "Use strncmp to match libraries. (use with -N)",
1674 "Locate cause of TEXTREL",
1675 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1676 "Print only ELF files matching numeric bits",
1677 "Print Endianness",
1678 "Print OSABI",
1679 "Print EABI (EM_ARM Only)",
1680 "Print only ELF files matching octal permissions",
1681 "Print ELF file size",
586 "Print all scanned info (-x -e -t -r)\n", 1682 "Print all scanned info (-x -e -t -r -b)\n",
587 "Only output 'bad' things", 1683 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 1684 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 1685 "Use specified format for output",
1686 "Read input stream from a filename",
590 "Write output stream to a filename", 1687 "Write output stream to a filename",
591 "Don't display the header", 1688 "Don't display the header",
592 "Print this help and exit", 1689 "Print this help and exit",
593 "Print version and exit", 1690 "Print version and exit",
594 NULL 1691 NULL
596 1693
597/* display usage and exit */ 1694/* display usage and exit */
598static void usage(int status) 1695static void usage(int status)
599{ 1696{
600 unsigned long i; 1697 unsigned long i;
601 printf(" Scan ELF binaries for stuff\n\n" 1698 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1699 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 1700 printf("Options: -[%s]\n", PARSE_FLAGS);
604 for (i = 0; long_opts[i].name; ++i) 1701 for (i = 0; long_opts[i].name; ++i)
605 if (long_opts[i].has_arg == no_argument) 1702 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1703 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
607 long_opts[i].name, opts_help[i]); 1704 long_opts[i].name, opts_help[i]);
608 else 1705 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1706 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
610 long_opts[i].name, opts_help[i]); 1707 long_opts[i].name, opts_help[i]);
1708
1709 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 1710 exit(status);
612} 1711}
613 1712
614/* parse command line arguments and preform needed actions */ 1713/* parse command line arguments and preform needed actions */
1714#define do_pax_state(option, flag) \
1715 if (islower(option)) { \
1716 flags &= ~PF_##flag; \
1717 flags |= PF_NO##flag; \
1718 } else { \
1719 flags &= ~PF_NO##flag; \
1720 flags |= PF_##flag; \
1721 }
615static void parseargs(int argc, char *argv[]) 1722static int parseargs(int argc, char *argv[])
616{ 1723{
617 int flag; 1724 int i;
1725 const char *from_file = NULL;
1726 int ret = 0;
618 1727
619 opterr = 0; 1728 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1729 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 1730 switch (i) {
622 1731
623 case 'V': 1732 case 'V':
624 printf("%s compiled %s\n%s\n" 1733 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1734 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 1735 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 1736 exit(EXIT_SUCCESS);
628 break; 1737 break;
629 case 'h': usage(EXIT_SUCCESS); break; 1738 case 'h': usage(EXIT_SUCCESS); break;
630 1739 case 'f':
1740 if (from_file) warn("You prob don't want to specify -f twice");
1741 from_file = optarg;
1742 break;
1743 case 'E':
1744 strncpy(match_etypes, optarg, sizeof(match_etypes));
1745 break;
1746 case 'M':
1747 match_bits = atoi(optarg);
1748 if (match_bits == 0) {
1749 if (strcmp(optarg, "ELFCLASS32") == 0)
1750 match_bits = 32;
1751 if (strcmp(optarg, "ELFCLASS64") == 0)
1752 match_bits = 64;
1753 }
1754 break;
1755 case 'O':
1756 if (sscanf(optarg, "%o", &match_perms) == (-1))
1757 match_bits = 0;
1758 break;
631 case 'o': { 1759 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 1760 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL)
635 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1761 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 1762 break;
638 } 1763 }
639 1764 case 'k':
1765 if (find_section) warn("You prob don't want to specify -k twice");
1766 find_section = optarg;
1767 break;
640 case 's': { 1768 case 's': {
641 size_t len; 1769 if (find_sym) warn("You prob don't want to specify -s twice");
642 find_sym = xstrdup(optarg); 1770 find_sym = optarg;
643 len = strlen(find_sym) + 1;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1771 versioned_symname = xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
645 sprintf(versioned_symname, "%s@", find_sym); 1772 sprintf(versioned_symname, "%s@", find_sym);
646 break; 1773 break;
647 } 1774 }
1775 case 'N': {
1776 if (find_lib) warn("You prob don't want to specify -N twice");
1777 find_lib = optarg;
1778 break;
1779 }
648 1780
649 case 'F': { 1781 case 'F': {
1782 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 1783 out_format = optarg;
1784 break;
1785 }
1786 case 'z': {
1787 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1788 size_t x;
1789
1790 for (x = 0; x < strlen(optarg); x++) {
1791 switch (optarg[x]) {
1792 case 'p':
1793 case 'P':
1794 do_pax_state(optarg[x], PAGEEXEC);
651 break; 1795 break;
1796 case 's':
1797 case 'S':
1798 do_pax_state(optarg[x], SEGMEXEC);
1799 break;
1800 case 'm':
1801 case 'M':
1802 do_pax_state(optarg[x], MPROTECT);
1803 break;
1804 case 'e':
1805 case 'E':
1806 do_pax_state(optarg[x], EMUTRAMP);
1807 break;
1808 case 'r':
1809 case 'R':
1810 do_pax_state(optarg[x], RANDMMAP);
1811 break;
1812 case 'x':
1813 case 'X':
1814 do_pax_state(optarg[x], RANDEXEC);
1815 break;
1816 default:
1817 break;
1818 }
652 } 1819 }
653 1820 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1821 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1822 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1823 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1824 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1825 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1826 setpax = flags;
1827 break;
1828 }
1829 case 'Z': show_size = 1; break;
1830 case 'g': g_match = 1; break;
1831 case 'L': use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 1832 case 'y': scan_symlink = 0; break;
1833 case 'A': scan_archives = 1; break;
655 case 'B': show_banner = 0; break; 1834 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 1835 case 'l': scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 1836 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 1837 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 1838 case 'm': dir_crossmount = 0; break;
1839 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 1840 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 1841 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 1842 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 1843 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 1844 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 1845 case 'i': show_interp = 1; break;
1846 case 'b': show_bind = 1; break;
1847 case 'S': show_soname = 1; break;
1848 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 1849 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1850 case 'v': be_verbose = (be_verbose % 20) + 1; break;
668 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break; 1851 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
669 1852 case 'D': show_endian = 1; break;
1853 case 'I': show_osabi = 1; break;
1854 case 'Y': show_eabi = 1; break;
670 case ':': 1855 case ':':
671 warn("Option missing parameter\n"); 1856 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 1857 case '?':
675 warn("Unknown option\n"); 1858 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 1859 default:
679 err("Unhandled option '%c'", flag); 1860 err("Unhandled option '%c'; please report this", i);
680 break;
681 }
682 } 1861 }
683 1862 }
684 if (be_quiet && be_verbose) 1863 if (show_textrels && be_verbose) {
685 err("You can be quiet or you can be verbose, not both, stupid"); 1864 if (which("objdump") != NULL)
686 1865 has_objdump = 1;
1866 }
687 /* let the format option override all other options */ 1867 /* let the format option override all other options */
688 if (out_format) { 1868 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1869 show_pax = show_phdr = show_textrel = show_rpath = \
1870 show_needed = show_interp = show_bind = show_soname = \
1871 show_textrels = show_perms = show_endian = show_size = \
1872 show_osabi = show_eabi = 0;
690 for (flag=0; out_format[flag]; ++flag) { 1873 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 1874 if (!IS_MODIFIER(out_format[i])) continue;
692 1875
693 switch (out_format[++flag]) { 1876 switch (out_format[++i]) {
1877 case '+': break;
694 case '%': break; 1878 case '%': break;
1879 case '#': break;
695 case 'F': break; 1880 case 'F': break;
1881 case 'p': break;
1882 case 'f': break;
1883 case 'k': break;
696 case 's': break; 1884 case 's': break;
1885 case 'N': break;
697 case 'o': break; 1886 case 'o': break;
1887 case 'a': break;
1888 case 'M': break;
1889 case 'Z': show_size = 1; break;
1890 case 'D': show_endian = 1; break;
1891 case 'I': show_osabi = 1; break;
1892 case 'Y': show_eabi = 1; break;
1893 case 'O': show_perms = 1; break;
698 case 'x': show_pax = 1; break; 1894 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 1895 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 1896 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 1897 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 1898 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 1899 case 'i': show_interp = 1; break;
1900 case 'b': show_bind = 1; break;
1901 case 'S': show_soname = 1; break;
1902 case 'T': show_textrels = 1; break;
704 default: 1903 default:
705 err("Invalid format specifier '%c' (byte %i)", 1904 err("Invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 1905 out_format[i], i+1);
707 } 1906 }
708 } 1907 }
709 1908
710 /* construct our default format */ 1909 /* construct our default format */
711 } else { 1910 } else {
712 size_t fmt_len = 30; 1911 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1912 out_format = xmalloc(sizeof(char) * fmt_len);
1913 *out_format = '\0';
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1914 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1915 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1916 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1917 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1918 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1919 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
1920 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1921 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1922 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1923 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1924 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1925 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1926 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1927 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1928 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1929 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1930 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1931 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1932 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 1933 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 1934 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 1935
726 /* now lets actually do the scanning */ 1936 /* now lets actually do the scanning */
1937 if (scan_ldpath || use_ldcache)
1938 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 1939 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 1940 if (scan_envpath) scanelf_envpath();
1941 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1942 from_file = "-";
1943 if (from_file) {
1944 scanelf_from_file(from_file);
1945 from_file = *argv;
1946 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 1947 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 1948 err("Nothing to scan !?");
731 while (optind < argc) 1949 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 1950 search_path = argv[optind++];
1951 ret = scanelf_dir(search_path);
1952 }
733 1953
734 /* clean up */ 1954 /* clean up */
735 if (find_sym) {
736 free(find_sym);
737 free(versioned_symname); 1955 free(versioned_symname);
738 } 1956 for (i = 0; ldpaths[i]; ++i)
739 if (out_format) free(out_format); 1957 free(ldpaths[i]);
740}
741 1958
742 1959 if (ldcache != 0)
743 1960 munmap(ldcache, ldcache_size);
744/* utility funcs */
745static char *xstrdup(char *s)
746{
747 char *ret = strdup(s);
748 if (!ret) err("Could not strdup(): %s", strerror(errno));
749 return ret; 1961 return ret;
750} 1962}
751static void *xmalloc(size_t size)
752{
753 void *ret = malloc(size);
754 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
755 return ret;
756}
757static void xstrcat(char **dst, const char *src, size_t *curr_len)
758{
759 long new_len;
760 1963
761 new_len = strlen(*dst) + strlen(src); 1964static char **get_split_env(const char *envvar)
762 if (*curr_len <= new_len) {
763 *curr_len = new_len + (*curr_len / 2);
764 *dst = realloc(*dst, *curr_len);
765 if (!*dst)
766 err("could not realloc %li bytes", (unsigned long)*curr_len);
767 }
768
769 strcat(*dst, src);
770}
771static inline void xchrcat(char **dst, const char append, size_t *curr_len)
772{ 1965{
773 static char my_app[2]; 1966 const char *delims = " \t\n";
774 my_app[0] = append; 1967 char **envvals = NULL;
775 my_app[1] = '\0'; 1968 char *env, *s;
776 xstrcat(dst, my_app, curr_len); 1969 int nentry;
777} 1970
778static int xemptybuffer(const char *buff) 1971 if ((env = getenv(envvar)) == NULL)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0; 1972 return NULL;
1973
1974 env = xstrdup(env);
1975 if (env == NULL)
784 return 1; 1976 return NULL;
785}
786 1977
1978 s = strtok(env, delims);
1979 if (s == NULL) {
1980 free(env);
1981 return NULL;
1982 }
787 1983
1984 nentry = 0;
1985 while (s != NULL) {
1986 ++nentry;
1987 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1988 envvals[nentry-1] = s;
1989 s = strtok(NULL, delims);
1990 }
1991 envvals[nentry] = NULL;
1992
1993 /* don't want to free(env) as it contains the memory that backs
1994 * the envvals array of strings */
1995 return envvals;
1996}
1997
1998static void parseenv(void)
1999{
2000 qa_textrels = get_split_env("QA_TEXTRELS");
2001 qa_execstack = get_split_env("QA_EXECSTACK");
2002 qa_wx_load = get_split_env("QA_WX_LOAD");
2003}
2004
2005#ifdef __PAX_UTILS_CLEANUP
2006static void cleanup(void)
2007{
2008 free(out_format);
2009 free(qa_textrels);
2010 free(qa_execstack);
2011 free(qa_wx_load);
2012}
2013#endif
788 2014
789int main(int argc, char *argv[]) 2015int main(int argc, char *argv[])
790{ 2016{
2017 int ret;
791 if (argc < 2) 2018 if (argc < 2)
792 usage(EXIT_FAILURE); 2019 usage(EXIT_FAILURE);
2020 parseenv();
793 parseargs(argc, argv); 2021 ret = parseargs(argc, argv);
794 fclose(stdout); 2022 fclose(stdout);
795 return EXIT_SUCCESS; 2023#ifdef __PAX_UTILS_CLEANUP
2024 cleanup();
2025 warn("The calls to add/delete heap should be off:\n"
2026 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2027 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2028#endif
2029 return ret;
796} 2030}
2031
2032/* Match filename against entries in matchlist, return TRUE
2033 * if the file is listed */
2034static int file_matches_list(const char *filename, char **matchlist)
2035{
2036 char **file;
2037 char *match;
2038 char buf[__PAX_UTILS_PATH_MAX];
2039
2040 if (matchlist == NULL)
2041 return 0;
2042
2043 for (file = matchlist; *file != NULL; file++) {
2044 if (search_path) {
2045 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2046 match = buf;
2047 } else {
2048 match = *file;
2049 }
2050 if (fnmatch(match, filename, 0) == 0)
2051 return 1;
2052 }
2053 return 0;
2054}

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