/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.44 Revision 1.192
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 1.192 2008/09/29 06:01:22 vapier 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>
25#include <stdlib.h>
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
36#include "paxelf.h"
37
38static const char *rcsid = "$Id: scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $"; 10static const char *rcsid = "$Id: scanelf.c,v 1.192 2008/09/29 06:01:22 vapier Exp $";
39#define argv0 "scanelf" 11const char * const argv0 = "scanelf";
40 12
13#include "paxinc.h"
41 14
15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
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) { \
309 if (sym->st_name) { \ 1002 if (sym->st_name) { \
1003 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1004 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
311 if (*find_sym == '*') { \ 1005 if ((void*)symname > (void*)elf->data_end) { \
1006 warnf("%s: corrupt ELF symbols", elf->filename); \
1007 ++sym; \
1008 continue; \
1009 } \
1010 /* debug display ... show all symbols and some extra info */ \
1011 if (g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
312 printf("%s(%s) %5lX %15s %s\n", \ 1012 printf("%s(%s) %5lX %15s %s %s\n", \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1013 ((*found_sym == 0) ? "\n\t" : "\t"), \
314 (char *)basename(filename), \ 1014 elf->base_filename, \
315 (long)sym->st_size, \ 1015 (unsigned long)sym->st_size, \
316 (char *)get_elfstttype(sym->st_info), \ 1016 get_elfstttype(sym->st_info), \
317 symname); \ 1017 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
318 *found_sym = 1; \ 1018 *found_sym = 1; \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 1019 } else { \
320 (strcmp(symname, versioned_symname) == 0)) \ 1020 /* allow the user to specify a comma delimited list of symbols to search for */ \
1021 char *this_sym, *this_sym_ver, *next_sym; \
1022 this_sym = ret; \
1023 this_sym_ver = versioned_symname; \
1024 do { \
1025 next_sym = strchr(this_sym, ','); \
1026 if (next_sym == NULL) \
1027 next_sym = this_sym + strlen(this_sym); \
1028 /* do we want a defined symbol ? */ \
1029 if (*this_sym == '+') { \
1030 if (sym->st_shndx == SHN_UNDEF) \
1031 goto skip_this_sym##B; \
1032 ++this_sym; \
1033 ++this_sym_ver; \
1034 /* do we want an undefined symbol ? */ \
1035 } else if (*this_sym == '-') { \
1036 if (sym->st_shndx != SHN_UNDEF) \
1037 goto skip_this_sym##B; \
1038 ++this_sym; \
1039 ++this_sym_ver; \
1040 } \
1041 /* ok, lets compare the name now */ \
1042 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
1043 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
1044 if (be_semi_verbose) { \
1045 char buf[126]; \
1046 snprintf(buf, sizeof(buf), "%lX %s %s", \
1047 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1048 ret = buf; \
1049 } else \
1050 ret = this_sym; \
321 (*found_sym)++; \ 1051 (*found_sym)++; \
1052 goto break_out; \
1053 } \
1054 skip_this_sym##B: this_sym = next_sym + 1; \
1055 } while (*next_sym != '\0'); \
1056 } \
322 } \ 1057 } \
323 ++sym; \ 1058 ++sym; \
324 } } 1059 } }
325 FIND_SYM(32) 1060 FIND_SYM(32)
326 FIND_SYM(64) 1061 FIND_SYM(64)
327 } 1062 }
1063
1064break_out:
1065 if (be_wewy_wewy_quiet) return NULL;
1066
328 if (*find_sym != '*' && *found_sym) 1067 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1068 return ret;
330 if (be_quiet) 1069 if (be_quiet)
331 return NULL; 1070 return NULL;
332 else 1071 else
333 return " - "; 1072 return (char *)" - ";
334} 1073}
1074
1075static char *scanelf_file_sections(elfobj *elf, char *found_section)
1076{
1077 if (!find_section)
1078 return NULL;
1079
1080#define FIND_SECTION(B) \
1081 if (elf->elf_class == ELFCLASS ## B) { \
1082 int invert; \
1083 Elf ## B ## _Shdr *section; \
1084 invert = (*find_section == '!' ? 1 : 0); \
1085 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1086 if ((section == NULL && invert) || (section != NULL && !invert)) \
1087 *found_section = 1; \
1088 }
1089 FIND_SECTION(32)
1090 FIND_SECTION(64)
1091
1092 if (be_wewy_wewy_quiet)
1093 return NULL;
1094
1095 if (*found_section)
1096 return find_section;
1097
1098 if (be_quiet)
1099 return NULL;
1100 else
1101 return (char *)" - ";
1102}
1103
335/* scan an elf file and show all the fun stuff */ 1104/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1105#define prints(str) write(fileno(stdout), str, strlen(str))
337static void scanelf_file(const char *filename) 1106static int scanelf_elfobj(elfobj *elf)
338{ 1107{
339 unsigned long i; 1108 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1109 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1110 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1111 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1112 static char *out_buffer = NULL;
346 static size_t out_len; 1113 static size_t out_len;
347 1114
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 = \ 1115 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1116 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1117 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1118
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) 1119 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1120 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1121 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1122 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1123 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1124 printf("%s: scanning file\n", elf->filename);
375 1125
376 /* init output buffer */ 1126 /* init output buffer */
377 if (!out_buffer) { 1127 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1128 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1129 out_buffer = xmalloc(out_len);
380 } 1130 }
381 *out_buffer = '\0'; 1131 *out_buffer = '\0';
382 1132
383 /* show the header */ 1133 /* show the header */
384 if (!be_quiet && show_banner) { 1134 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1135 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1136 if (!IS_MODIFIER(out_format[i])) continue;
387 1137
388 switch (out_format[++i]) { 1138 switch (out_format[++i]) {
1139 case '+': break;
389 case '%': break; 1140 case '%': break;
1141 case '#': break;
1142 case 'F':
1143 case 'p':
390 case 'F': prints("FILE "); break; 1144 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1145 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1146 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1147 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1148 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1149 case 'r': prints("RPATH "); break;
1150 case 'M': prints("CLASS "); break;
396 case 'n': prints("NEEDED "); break; 1151 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1152 case 'i': prints("INTERP "); break;
1153 case 'b': prints("BIND "); break;
1154 case 'Z': prints("SIZE "); break;
1155 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1156 case 's': prints("SYM "); break;
1157 case 'N': prints("LIB "); break;
1158 case 'T': prints("TEXTRELS "); break;
1159 case 'k': prints("SECTION "); break;
1160 case 'a': prints("ARCH "); break;
1161 case 'I': prints("OSABI "); break;
1162 case 'Y': prints("EABI "); break;
1163 case 'O': prints("PERM "); break;
1164 case 'D': prints("ENDIAN "); break;
1165 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1166 }
400 } 1167 }
1168 if (!found_file) prints("FILE ");
401 prints("\n"); 1169 prints("\n");
1170 found_file = 0;
402 show_banner = 0; 1171 show_banner = 0;
403 } 1172 }
404 1173
405 /* dump all the good stuff */ 1174 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1175 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1176 const char *out;
408 1177 const char *tmp;
409 /* make sure we trim leading spaces in quiet mode */ 1178 static char ubuf[sizeof(unsigned long)*2];
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 1179 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); 1180 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1181 continue;
416 } 1182 }
417 1183
418 out = NULL; 1184 out = NULL;
1185 be_wewy_wewy_quiet = (out_format[i] == '#');
1186 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1187 switch (out_format[++i]) {
1188 case '+':
1189 case '%':
1190 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1191 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1192 case 'F':
1193 found_file = 1;
1194 if (be_wewy_wewy_quiet) break;
1195 xstrcat(&out_buffer, elf->filename, &out_len);
1196 break;
1197 case 'p':
1198 found_file = 1;
1199 if (be_wewy_wewy_quiet) break;
1200 tmp = elf->filename;
1201 if (search_path) {
1202 ssize_t len_search = strlen(search_path);
1203 ssize_t len_file = strlen(elf->filename);
1204 if (!strncmp(elf->filename, search_path, len_search) && \
1205 len_file > len_search)
1206 tmp += len_search;
1207 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1208 }
1209 xstrcat(&out_buffer, tmp, &out_len);
1210 break;
1211 case 'f':
1212 found_file = 1;
1213 if (be_wewy_wewy_quiet) break;
1214 tmp = strrchr(elf->filename, '/');
1215 tmp = (tmp == NULL ? elf->filename : tmp+1);
1216 xstrcat(&out_buffer, tmp, &out_len);
1217 break;
422 case 'o': out = get_elfetype(elf); break; 1218 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1219 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1220 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; 1221 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1222 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; 1223 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1224 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1225 case 'D': out = get_endian(elf); break;
1226 case 'O': out = getstr_perms(elf->filename); break;
1227 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1228 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; 1229 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1230 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1231 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1232 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1233 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1234 case 'a': out = get_elfemtype(elf); break;
1235 case 'I': out = get_elfosabi(elf); break;
1236 case 'Y': out = get_elf_eabi(elf); break;
1237 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", elf->len); out = ubuf; break;;
1238 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1239 }
1240 if (out) {
1241 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1242 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1243 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1244 else
431 if (out) xstrcat(&out_buffer, out, &out_len); 1245 xstrcat(&out_buffer, out, &out_len);
432 } 1246 }
1247 }
433 1248
434 if (!found_file) { 1249#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1250 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1251 found_rpath || found_needed || found_interp || found_bind || \
1252 found_soname || found_sym || found_lib || found_textrels || found_section )
1253
1254 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1255 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1256 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1257 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1258 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1259 puts(out_buffer);
1260 fflush(stdout);
1261 }
441 1262
1263 return 0;
1264}
1265
1266/* scan a single elf */
1267static int scanelf_elf(const char *filename, int fd, size_t len)
1268{
1269 int ret = 1;
1270 elfobj *elf;
1271
1272 /* verify this is real ELF */
1273 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1274 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1275 return ret;
1276 }
1277 switch (match_bits) {
1278 case 32:
1279 if (elf->elf_class != ELFCLASS32)
1280 goto label_done;
1281 break;
1282 case 64:
1283 if (elf->elf_class != ELFCLASS64)
1284 goto label_done;
1285 break;
1286 default: break;
1287 }
1288 if (strlen(match_etypes)) {
1289 char sbuf[126];
1290 strncpy(sbuf, match_etypes, sizeof(sbuf));
1291 if (strchr(match_etypes, ',') != NULL) {
1292 char *p;
1293 while ((p = strrchr(sbuf, ',')) != NULL) {
1294 *p = 0;
1295 if (etype_lookup(p+1) == get_etype(elf))
1296 goto label_ret;
1297 }
1298 }
1299 if (etype_lookup(sbuf) != get_etype(elf))
1300 goto label_done;
1301 }
1302
1303label_ret:
1304 ret = scanelf_elfobj(elf);
1305
1306label_done:
442 unreadelf(elf); 1307 unreadelf(elf);
1308 return ret;
1309}
1310
1311/* scan an archive of elfs */
1312static int scanelf_archive(const char *filename, int fd, size_t len)
1313{
1314 archive_handle *ar;
1315 archive_member *m;
1316 char *ar_buffer;
1317 elfobj *elf;
1318
1319 ar = ar_open_fd(filename, fd);
1320 if (ar == NULL)
1321 return 1;
1322
1323 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1324 while ((m=ar_next(ar)) != NULL) {
1325 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1326 if (elf) {
1327 scanelf_elfobj(elf);
1328 unreadelf(elf);
1329 }
1330 }
1331 munmap(ar_buffer, len);
1332
1333 return 0;
1334}
1335/* scan a file which may be an elf or an archive or some other magical beast */
1336static int scanelf_file(const char *filename, const struct stat *st_cache)
1337{
1338 const struct stat *st = st_cache;
1339 struct stat symlink_st;
1340 int fd;
1341
1342 /* always handle regular files and handle symlinked files if no -y */
1343 if (S_ISLNK(st->st_mode)) {
1344 if (!scan_symlink) return 1;
1345 stat(filename, &symlink_st);
1346 st = &symlink_st;
1347 }
1348
1349 if (!S_ISREG(st->st_mode)) {
1350 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1351 return 1;
1352 }
1353
1354 if (match_perms) {
1355 if ((st->st_mode | match_perms) != st->st_mode)
1356 return 1;
1357 }
1358 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1359 return 1;
1360
1361 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1362 /* if it isn't an ELF, maybe it's an .a archive */
1363 scanelf_archive(filename, fd, st->st_size);
1364
1365 close(fd);
1366 return 0;
443} 1367}
444 1368
445/* scan a directory for ET_EXEC files and print when we find one */ 1369/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1370static int scanelf_dir(const char *path)
447{ 1371{
448 register DIR *dir; 1372 register DIR *dir;
449 register struct dirent *dentry; 1373 register struct dirent *dentry;
450 struct stat st_top, st; 1374 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1375 char buf[__PAX_UTILS_PATH_MAX];
452 size_t pathlen = 0, len = 0; 1376 size_t pathlen = 0, len = 0;
1377 int ret = 0;
453 1378
454 /* make sure path exists */ 1379 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1380 if (lstat(path, &st_top) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1381 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1382 return 1;
458 } 1383 }
459 1384
460 /* ok, if it isn't a directory, assume we can open it */ 1385 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1386 if (!S_ISDIR(st_top.st_mode)) {
462 scanelf_file(path); 1387 return scanelf_file(path, &st_top);
463 return;
464 } 1388 }
465 1389
466 /* now scan the dir looking for fun stuff */ 1390 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1391 if ((dir = opendir(path)) == NULL) {
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1392 warnf("could not opendir %s: %s", path, strerror(errno));
469 return; 1393 return 1;
470 } 1394 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1395 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1396
473 pathlen = strlen(path); 1397 pathlen = strlen(path);
474 while ((dentry = readdir(dir))) { 1398 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1399 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1400 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1401 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
478 if (len >= sizeof(buf)) { 1402 if (len >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1403 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1404 (unsigned long)len, (unsigned long)sizeof(buf));
480 continue; 1405 continue;
481 } 1406 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1407 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
483 if (lstat(buf, &st) != -1) { 1408 if (lstat(buf, &st) != -1) {
484 if (S_ISREG(st.st_mode)) 1409 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1410 ret = scanelf_file(buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1411 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1412 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1413 ret = scanelf_dir(buf);
489 } 1414 }
490 } 1415 }
491 } 1416 }
492 closedir(dir); 1417 closedir(dir);
1418 return ret;
493} 1419}
1420
1421static int scanelf_from_file(const char *filename)
1422{
1423 FILE *fp = NULL;
1424 char *p;
1425 char path[__PAX_UTILS_PATH_MAX];
1426 int ret = 0;
1427
1428 if (strcmp(filename, "-") == 0)
1429 fp = stdin;
1430 else if ((fp = fopen(filename, "r")) == NULL)
1431 return 1;
1432
1433 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1434 if ((p = strchr(path, '\n')) != NULL)
1435 *p = 0;
1436 search_path = path;
1437 ret = scanelf_dir(path);
1438 }
1439 if (fp != stdin)
1440 fclose(fp);
1441 return ret;
1442}
1443
1444#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1445
1446static int load_ld_cache_config(int i, const char *fname)
1447{
1448 FILE *fp = NULL;
1449 char *p;
1450 char path[__PAX_UTILS_PATH_MAX];
1451
1452 if (i + 1 == ARRAY_SIZE(ldpaths))
1453 return i;
1454
1455 if ((fp = fopen(fname, "r")) == NULL)
1456 return i;
1457
1458 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1459 if ((p = strrchr(path, '\r')) != NULL)
1460 *p = 0;
1461 if ((p = strchr(path, '\n')) != NULL)
1462 *p = 0;
1463#ifdef __linux__
1464 /* recursive includes of the same file will make this segfault. */
1465 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1466 glob64_t gl;
1467 size_t x;
1468 char gpath[__PAX_UTILS_PATH_MAX];
1469
1470 memset(gpath, 0, sizeof(gpath));
1471
1472 if (path[8] != '/')
1473 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1474 else
1475 strncpy(gpath, &path[8], sizeof(gpath));
1476
1477 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1478 for (x = 0; x < gl.gl_pathc; ++x) {
1479 /* try to avoid direct loops */
1480 if (strcmp(gl.gl_pathv[x], fname) == 0)
1481 continue;
1482 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1483 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1484 globfree64(&gl);
1485 return i;
1486 }
1487 }
1488 globfree64 (&gl);
1489 continue;
1490 }
1491 }
1492#endif
1493 if (*path != '/')
1494 continue;
1495
1496 ldpaths[i++] = xstrdup(path);
1497
1498 if (i + 1 == ARRAY_SIZE(ldpaths))
1499 break;
1500 }
1501 ldpaths[i] = NULL;
1502
1503 fclose(fp);
1504 return i;
1505}
1506
1507#elif defined(__FreeBSD__) || (__DragonFly__)
1508
1509static int load_ld_cache_config(int i, const char *fname)
1510{
1511 FILE *fp = NULL;
1512 char *b = NULL, *p;
1513 struct elfhints_hdr hdr;
1514
1515 if (i + 1 == ARRAY_SIZE(ldpaths))
1516 return i;
1517
1518 if ((fp = fopen(fname, "r")) == NULL)
1519 return i;
1520
1521 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1522 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1523 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1524 {
1525 fclose(fp);
1526 return i;
1527 }
1528
1529 b = xmalloc(hdr.dirlistlen + 1);
1530 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1531 fclose(fp);
1532 free(b);
1533 return i;
1534 }
1535
1536 while ((p = strsep(&b, ":"))) {
1537 if (*p == '\0') continue;
1538 ldpaths[i++] = xstrdup(p);
1539
1540 if (i + 1 == ARRAY_SIZE(ldpaths))
1541 break;
1542 }
1543 ldpaths[i] = NULL;
1544
1545 free(b);
1546 fclose(fp);
1547 return i;
1548}
1549
1550#else
1551#ifdef __ELF__
1552#warning Cache config support not implemented for your target
1553#endif
1554static int load_ld_cache_config(int i, const char *fname)
1555{
1556 memset(ldpaths, 0x00, sizeof(ldpaths));
1557 return 0;
1558}
1559#endif
494 1560
495/* scan /etc/ld.so.conf for paths */ 1561/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1562static void scanelf_ldpath(void)
497{ 1563{
498 char scan_l, scan_ul, scan_ull; 1564 char scan_l, scan_ul, scan_ull;
499 char *path, *p; 1565 int i = 0;
500 FILE *fp;
501 1566
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1567 if (!ldpaths[0])
503 err("Unable to open ld.so.conf: %s", strerror(errno)); 1568 err("Unable to load any paths from ld.so.conf");
504 1569
505 scan_l = scan_ul = scan_ull = 0; 1570 scan_l = scan_ul = scan_ull = 0;
506 1571
507 path = (char*)xmalloc(_POSIX_PATH_MAX); 1572 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; 1573 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
515 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1574 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
516 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1575 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
517 scanelf_dir(path); 1576 scanelf_dir(ldpaths[i]);
1577 ++i;
518 } 1578 }
519 free(path);
520 fclose(fp);
521 1579
522 if (!scan_l) scanelf_dir("/lib"); 1580 if (!scan_l) scanelf_dir("/lib");
523 if (!scan_ul) scanelf_dir("/usr/lib"); 1581 if (!scan_ul) scanelf_dir("/usr/lib");
524 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1582 if (!scan_ull) scanelf_dir("/usr/local/lib");
525} 1583}
526 1584
527/* scan env PATH for paths */ 1585/* scan env PATH for paths */
528static void scanelf_envpath() 1586static void scanelf_envpath(void)
529{ 1587{
530 char *path, *p; 1588 char *path, *p;
531 1589
532 path = getenv("PATH"); 1590 path = getenv("PATH");
533 if (!path) 1591 if (!path)
540 } 1598 }
541 1599
542 free(path); 1600 free(path);
543} 1601}
544 1602
545 1603/* 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" 1604#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZBhV"
549#define a_argument required_argument 1605#define a_argument required_argument
550static struct option const long_opts[] = { 1606static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1607 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1608 {"ldpath", no_argument, NULL, 'l'},
553 {"recursive", no_argument, NULL, 'R'}, 1609 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1610 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1611 {"symlink", no_argument, NULL, 'y'},
1612 {"archives", no_argument, NULL, 'A'},
1613 {"ldcache", no_argument, NULL, 'L'},
1614 {"fix", no_argument, NULL, 'X'},
1615 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1616 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1617 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1618 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1619 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1620 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1621 {"interp", no_argument, NULL, 'i'},
1622 {"bind", no_argument, NULL, 'b'},
1623 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1624 {"symbol", a_argument, NULL, 's'},
1625 {"section", a_argument, NULL, 'k'},
1626 {"lib", a_argument, NULL, 'N'},
1627 {"gmatch", no_argument, NULL, 'g'},
1628 {"textrels", no_argument, NULL, 'T'},
1629 {"etype", a_argument, NULL, 'E'},
1630 {"bits", a_argument, NULL, 'M'},
1631 {"endian", no_argument, NULL, 'D'},
1632 {"osabi", no_argument, NULL, 'I'},
1633 {"eabi", no_argument, NULL, 'Y'},
1634 {"perms", a_argument, NULL, 'O'},
1635 {"size", no_argument, NULL, 'Z'},
563 {"all", no_argument, NULL, 'a'}, 1636 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1637 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1638 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1639 {"format", a_argument, NULL, 'F'},
1640 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1641 {"file", a_argument, NULL, 'o'},
568 {"nobanner", no_argument, NULL, 'B'}, 1642 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1643 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1644 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1645 {NULL, no_argument, NULL, 0x0}
572}; 1646};
1647
573static char *opts_help[] = { 1648static const char *opts_help[] = {
574 "Scan all directories in PATH environment", 1649 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1650 "Scan all directories in /etc/ld.so.conf",
576 "Scan directories recursively", 1651 "Scan directories recursively",
577 "Don't recursively cross mount points", 1652 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1653 "Don't scan symlinks",
1654 "Scan archives (.a files)",
1655 "Utilize ld.so.cache information (use with -r/-n)",
1656 "Try and 'fix' bad things (use with -r/-e)",
1657 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 1658 "Print PaX markings",
580 "Print GNU_STACK markings", 1659 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 1660 "Print TEXTREL information",
582 "Print RPATH information", 1661 "Print RPATH information",
583 "Print NEEDED information", 1662 "Print NEEDED information",
584 "Print INTERP information", 1663 "Print INTERP information",
1664 "Print BIND information",
1665 "Print SONAME information",
585 "Find a specified symbol", 1666 "Find a specified symbol",
1667 "Find a specified section",
1668 "Find a specified library",
1669 "Use strncmp to match libraries. (use with -N)",
1670 "Locate cause of TEXTREL",
1671 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1672 "Print only ELF files matching numeric bits",
1673 "Print Endianness",
1674 "Print OSABI",
1675 "Print EABI (EM_ARM Only)",
1676 "Print only ELF files matching octal permissions",
1677 "Print ELF file size",
586 "Print all scanned info (-x -e -t -r)\n", 1678 "Print all scanned info (-x -e -t -r -b)\n",
587 "Only output 'bad' things", 1679 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 1680 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 1681 "Use specified format for output",
1682 "Read input stream from a filename",
590 "Write output stream to a filename", 1683 "Write output stream to a filename",
591 "Don't display the header", 1684 "Don't display the header",
592 "Print this help and exit", 1685 "Print this help and exit",
593 "Print version and exit", 1686 "Print version and exit",
594 NULL 1687 NULL
596 1689
597/* display usage and exit */ 1690/* display usage and exit */
598static void usage(int status) 1691static void usage(int status)
599{ 1692{
600 unsigned long i; 1693 unsigned long i;
601 printf(" Scan ELF binaries for stuff\n\n" 1694 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1695 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 1696 printf("Options: -[%s]\n", PARSE_FLAGS);
604 for (i = 0; long_opts[i].name; ++i) 1697 for (i = 0; long_opts[i].name; ++i)
605 if (long_opts[i].has_arg == no_argument) 1698 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1699 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
607 long_opts[i].name, opts_help[i]); 1700 long_opts[i].name, opts_help[i]);
608 else 1701 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1702 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
610 long_opts[i].name, opts_help[i]); 1703 long_opts[i].name, opts_help[i]);
1704
1705 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 1706 exit(status);
612} 1707}
613 1708
614/* parse command line arguments and preform needed actions */ 1709/* parse command line arguments and preform needed actions */
1710#define do_pax_state(option, flag) \
1711 if (islower(option)) { \
1712 flags &= ~PF_##flag; \
1713 flags |= PF_NO##flag; \
1714 } else { \
1715 flags &= ~PF_NO##flag; \
1716 flags |= PF_##flag; \
1717 }
615static void parseargs(int argc, char *argv[]) 1718static int parseargs(int argc, char *argv[])
616{ 1719{
617 int flag; 1720 int i;
1721 const char *from_file = NULL;
1722 int ret = 0;
618 1723
619 opterr = 0; 1724 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1725 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 1726 switch (i) {
622 1727
623 case 'V': 1728 case 'V':
624 printf("%s compiled %s\n%s\n" 1729 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1730 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 1731 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 1732 exit(EXIT_SUCCESS);
628 break; 1733 break;
629 case 'h': usage(EXIT_SUCCESS); break; 1734 case 'h': usage(EXIT_SUCCESS); break;
630 1735 case 'f':
1736 if (from_file) warn("You prob don't want to specify -f twice");
1737 from_file = optarg;
1738 break;
1739 case 'E':
1740 strncpy(match_etypes, optarg, sizeof(match_etypes));
1741 break;
1742 case 'M':
1743 match_bits = atoi(optarg);
1744 if (match_bits == 0) {
1745 if (strcmp(optarg, "ELFCLASS32") == 0)
1746 match_bits = 32;
1747 if (strcmp(optarg, "ELFCLASS64") == 0)
1748 match_bits = 64;
1749 }
1750 break;
1751 case 'O':
1752 if (sscanf(optarg, "%o", &match_perms) == (-1))
1753 match_bits = 0;
1754 break;
631 case 'o': { 1755 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 1756 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL)
635 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1757 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 1758 break;
638 } 1759 }
639 1760 case 'k':
1761 if (find_section) warn("You prob don't want to specify -k twice");
1762 find_section = optarg;
1763 break;
640 case 's': { 1764 case 's': {
641 size_t len; 1765 if (find_sym) warn("You prob don't want to specify -s twice");
642 find_sym = xstrdup(optarg); 1766 find_sym = optarg;
643 len = strlen(find_sym) + 1;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1767 versioned_symname = xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
645 sprintf(versioned_symname, "%s@", find_sym); 1768 sprintf(versioned_symname, "%s@", find_sym);
646 break; 1769 break;
647 } 1770 }
1771 case 'N': {
1772 if (find_lib) warn("You prob don't want to specify -N twice");
1773 find_lib = optarg;
1774 break;
1775 }
648 1776
649 case 'F': { 1777 case 'F': {
1778 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 1779 out_format = optarg;
1780 break;
1781 }
1782 case 'z': {
1783 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1784 size_t x;
1785
1786 for (x = 0; x < strlen(optarg); x++) {
1787 switch (optarg[x]) {
1788 case 'p':
1789 case 'P':
1790 do_pax_state(optarg[x], PAGEEXEC);
651 break; 1791 break;
1792 case 's':
1793 case 'S':
1794 do_pax_state(optarg[x], SEGMEXEC);
1795 break;
1796 case 'm':
1797 case 'M':
1798 do_pax_state(optarg[x], MPROTECT);
1799 break;
1800 case 'e':
1801 case 'E':
1802 do_pax_state(optarg[x], EMUTRAMP);
1803 break;
1804 case 'r':
1805 case 'R':
1806 do_pax_state(optarg[x], RANDMMAP);
1807 break;
1808 case 'x':
1809 case 'X':
1810 do_pax_state(optarg[x], RANDEXEC);
1811 break;
1812 default:
1813 break;
1814 }
652 } 1815 }
653 1816 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1817 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1818 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1819 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1820 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1821 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1822 setpax = flags;
1823 break;
1824 }
1825 case 'Z': show_size = 1; break;
1826 case 'g': g_match = 1; break;
1827 case 'L': use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 1828 case 'y': scan_symlink = 0; break;
1829 case 'A': scan_archives = 1; break;
655 case 'B': show_banner = 0; break; 1830 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 1831 case 'l': scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 1832 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 1833 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 1834 case 'm': dir_crossmount = 0; break;
1835 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 1836 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 1837 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 1838 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 1839 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 1840 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 1841 case 'i': show_interp = 1; break;
1842 case 'b': show_bind = 1; break;
1843 case 'S': show_soname = 1; break;
1844 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 1845 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1846 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; 1847 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
669 1848 case 'D': show_endian = 1; break;
1849 case 'I': show_osabi = 1; break;
1850 case 'Y': show_eabi = 1; break;
670 case ':': 1851 case ':':
671 warn("Option missing parameter\n"); 1852 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 1853 case '?':
675 warn("Unknown option\n"); 1854 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 1855 default:
679 err("Unhandled option '%c'", flag); 1856 err("Unhandled option '%c'; please report this", i);
680 break;
681 }
682 } 1857 }
683 1858 }
684 if (be_quiet && be_verbose) 1859 if (show_textrels && be_verbose) {
685 err("You can be quiet or you can be verbose, not both, stupid"); 1860 if (which("objdump") != NULL)
686 1861 has_objdump = 1;
1862 }
687 /* let the format option override all other options */ 1863 /* let the format option override all other options */
688 if (out_format) { 1864 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1865 show_pax = show_phdr = show_textrel = show_rpath = \
1866 show_needed = show_interp = show_bind = show_soname = \
1867 show_textrels = show_perms = show_endian = show_size = \
1868 show_osabi = show_eabi = 0;
690 for (flag=0; out_format[flag]; ++flag) { 1869 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 1870 if (!IS_MODIFIER(out_format[i])) continue;
692 1871
693 switch (out_format[++flag]) { 1872 switch (out_format[++i]) {
1873 case '+': break;
694 case '%': break; 1874 case '%': break;
1875 case '#': break;
695 case 'F': break; 1876 case 'F': break;
1877 case 'p': break;
1878 case 'f': break;
1879 case 'k': break;
696 case 's': break; 1880 case 's': break;
1881 case 'N': break;
697 case 'o': break; 1882 case 'o': break;
1883 case 'a': break;
1884 case 'M': break;
1885 case 'Z': show_size = 1; break;
1886 case 'D': show_endian = 1; break;
1887 case 'I': show_osabi = 1; break;
1888 case 'Y': show_eabi = 1; break;
1889 case 'O': show_perms = 1; break;
698 case 'x': show_pax = 1; break; 1890 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 1891 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 1892 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 1893 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 1894 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 1895 case 'i': show_interp = 1; break;
1896 case 'b': show_bind = 1; break;
1897 case 'S': show_soname = 1; break;
1898 case 'T': show_textrels = 1; break;
704 default: 1899 default:
705 err("Invalid format specifier '%c' (byte %i)", 1900 err("Invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 1901 out_format[i], i+1);
707 } 1902 }
708 } 1903 }
709 1904
710 /* construct our default format */ 1905 /* construct our default format */
711 } else { 1906 } else {
712 size_t fmt_len = 30; 1907 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1908 out_format = xmalloc(sizeof(char) * fmt_len);
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1909 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1910 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1911 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1912 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1913 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1914 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
1915 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1916 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1917 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1918 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1919 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1920 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1921 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1922 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1923 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1924 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1925 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1926 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1927 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 1928 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 1929 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 1930
726 /* now lets actually do the scanning */ 1931 /* now lets actually do the scanning */
1932 if (scan_ldpath || use_ldcache)
1933 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 1934 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 1935 if (scan_envpath) scanelf_envpath();
1936 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1937 from_file = "-";
1938 if (from_file) {
1939 scanelf_from_file(from_file);
1940 from_file = *argv;
1941 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 1942 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 1943 err("Nothing to scan !?");
731 while (optind < argc) 1944 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 1945 search_path = argv[optind++];
1946 ret = scanelf_dir(search_path);
1947 }
733 1948
734 /* clean up */ 1949 /* clean up */
735 if (find_sym) {
736 free(find_sym);
737 free(versioned_symname); 1950 free(versioned_symname);
738 } 1951 for (i = 0; ldpaths[i]; ++i)
739 if (out_format) free(out_format); 1952 free(ldpaths[i]);
740}
741 1953
742 1954 if (ldcache != 0)
743 1955 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; 1956 return ret;
750} 1957}
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 1958
761 new_len = strlen(*dst) + strlen(src); 1959static 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{ 1960{
773 static char my_app[2]; 1961 const char *delims = " \t\n";
774 my_app[0] = append; 1962 char **envvals = NULL;
775 my_app[1] = '\0'; 1963 char *env, *s;
776 xstrcat(dst, my_app, curr_len); 1964 int nentry;
777} 1965
778static int xemptybuffer(const char *buff) 1966 if ((env = getenv(envvar)) == NULL)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0; 1967 return NULL;
1968
1969 env = xstrdup(env);
1970 if (env == NULL)
784 return 1; 1971 return NULL;
785}
786 1972
1973 s = strtok(env, delims);
1974 if (s == NULL) {
1975 free(env);
1976 return NULL;
1977 }
787 1978
1979 nentry = 0;
1980 while (s != NULL) {
1981 ++nentry;
1982 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1983 envvals[nentry-1] = s;
1984 s = strtok(NULL, delims);
1985 }
1986 envvals[nentry] = NULL;
1987
1988 /* don't want to free(env) as it contains the memory that backs
1989 * the envvals array of strings */
1990 return envvals;
1991}
1992
1993static void parseenv(void)
1994{
1995 qa_textrels = get_split_env("QA_TEXTRELS");
1996 qa_execstack = get_split_env("QA_EXECSTACK");
1997 qa_wx_load = get_split_env("QA_WX_LOAD");
1998}
1999
2000#ifdef __PAX_UTILS_CLEANUP
2001static void cleanup(void)
2002{
2003 free(out_format);
2004 free(qa_textrels);
2005 free(qa_execstack);
2006 free(qa_wx_load);
2007}
2008#endif
788 2009
789int main(int argc, char *argv[]) 2010int main(int argc, char *argv[])
790{ 2011{
2012 int ret;
791 if (argc < 2) 2013 if (argc < 2)
792 usage(EXIT_FAILURE); 2014 usage(EXIT_FAILURE);
2015 parseenv();
793 parseargs(argc, argv); 2016 ret = parseargs(argc, argv);
794 fclose(stdout); 2017 fclose(stdout);
795 return EXIT_SUCCESS; 2018#ifdef __PAX_UTILS_CLEANUP
2019 cleanup();
2020 warn("The calls to add/delete heap should be off:\n"
2021 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2022 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2023#endif
2024 return ret;
796} 2025}
2026
2027/* Match filename against entries in matchlist, return TRUE
2028 * if the file is listed */
2029static int file_matches_list(const char *filename, char **matchlist)
2030{
2031 char **file;
2032 char *match;
2033 char buf[__PAX_UTILS_PATH_MAX];
2034
2035 if (matchlist == NULL)
2036 return 0;
2037
2038 for (file = matchlist; *file != NULL; file++) {
2039 if (search_path) {
2040 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2041 match = buf;
2042 } else {
2043 match = *file;
2044 }
2045 if (fnmatch(match, filename, 0) == 0)
2046 return 1;
2047 }
2048 return 0;
2049}

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