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

Diff of /pax-utils/scanelf.c

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

Revision 1.44 Revision 1.208
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 1.208 2009/01/31 17:58:37 grobian 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 1.208 2009/01/31 17:58:37 grobian 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;
71static char *find_sym = NULL, *versioned_symname = NULL; 58static char be_wewy_wewy_quiet = 0;
59static char be_semi_verbose = 0;
60static char *find_sym = 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
73static int match_bits = 0;
74static unsigned int match_perms = 0;
75static caddr_t ldcache = 0;
76static size_t ldcache_size = 0;
77static unsigned long setpax = 0UL;
78
79static int has_objdump = 0;
80
81/* find the path to a file by name */
82static char *which(const char *fname)
83{
84 static char fullpath[__PAX_UTILS_PATH_MAX];
85 char *path, *p;
86
87 path = getenv("PATH");
88 if (!path)
89 return NULL;
90
91 path = xstrdup(path);
92 while ((p = strrchr(path, ':')) != NULL) {
93 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
94 *p = 0;
95 if (access(fullpath, R_OK) != -1) {
96 free(path);
97 return fullpath;
98 }
99 }
100 free(path);
101 return NULL;
102}
103
104/* 1 on failure. 0 otherwise */
105static int rematch(const char *regex, const char *match, int cflags)
106{
107 regex_t preg;
108 int ret;
109
110 if ((match == NULL) || (regex == NULL))
111 return EXIT_FAILURE;
112
113 if ((ret = regcomp(&preg, regex, cflags))) {
114 char err[256];
115
116 if (regerror(ret, &preg, err, sizeof(err)))
117 fprintf(stderr, "regcomp failed: %s", err);
118 else
119 fprintf(stderr, "regcomp failed");
120
121 return EXIT_FAILURE;
122 }
123 ret = regexec(&preg, match, 0, NULL, 0);
124 regfree(&preg);
125
126 return ret;
127}
75 128
76/* sub-funcs for scanelf_file() */ 129/* sub-funcs for scanelf_file() */
130static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
131{
132 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
133#define GET_SYMTABS(B) \
134 if (elf->elf_class == ELFCLASS ## B) { \
135 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
136 /* debug sections */ \
137 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
138 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
139 /* runtime sections */ \
140 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
141 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
142 if (symtab && dynsym) { \
143 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
144 } else { \
145 *sym = (void*)(symtab ? symtab : dynsym); \
146 } \
147 if (strtab && dynstr) { \
148 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
149 } else { \
150 *tab = (void*)(strtab ? strtab : dynstr); \
151 } \
152 }
153 GET_SYMTABS(32)
154 GET_SYMTABS(64)
155}
156
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 157static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 158{
79 static char *paxflags; 159 static char ret[7];
160 unsigned long i, shown;
80 161
81 if (!show_pax) return NULL; 162 if (!show_pax) return NULL;
82 163
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; 164 shown = 0;
100 strcpy(ret, "--- ---"); 165 memset(&ret, 0, sizeof(ret));
101 166
102 if (elf->phdr) { 167 if (elf->phdr) {
103#define SHOW_STACK(B) \ 168#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 169 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 170 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 172 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 173 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; \ 174 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 175 if (fix_elf && setpax) { \
176 /* set the paxctl flags */ \
177 ESET(phdr[i].p_flags, setpax); \
178 } \
179 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 180 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 181 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 182 *found_pax = 1; \
120 ++shown; \ 183 ++shown; \
184 break; \
121 } \ 185 } \
122 } 186 }
123 SHOW_STACK(32) 187 SHOW_PAX(32)
124 SHOW_STACK(64) 188 SHOW_PAX(64)
189 }
190
191 if (fix_elf && setpax) {
192 /* set the chpax settings */
193 if (elf->elf_class == ELFCLASS32) {
194 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
195 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
196 } else {
197 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
198 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
125 } 199 }
200 }
126 201
127 if (be_quiet && !shown) 202 /* fall back to EI_PAX if no PT_PAX was found */
203 if (!*ret) {
204 static char *paxflags;
205 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
206 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
207 *found_pax = 1;
208 return (be_wewy_wewy_quiet ? NULL : paxflags);
209 }
210 strncpy(ret, paxflags, sizeof(ret));
211 }
212
213 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 214 return NULL;
129 else 215 else
130 return ret; 216 return ret;
131} 217}
218
219static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
220{
221 static char ret[12];
222 char *found;
223 unsigned long i, shown, multi_stack, multi_relro, multi_load;
224 int max_pt_load;
225
226 if (!show_phdr) return NULL;
227
228 memcpy(ret, "--- --- ---\0", 12);
229
230 shown = 0;
231 multi_stack = multi_relro = multi_load = 0;
232 max_pt_load = elf_max_pt_load(elf);
233
234#define NOTE_GNU_STACK ".note.GNU-stack"
235#define SHOW_PHDR(B) \
236 if (elf->elf_class == ELFCLASS ## B) { \
237 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
238 Elf ## B ## _Off offset; \
239 uint32_t flags, check_flags; \
240 if (elf->phdr != NULL) { \
241 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
242 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
243 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
244 if (multi_stack++) \
245 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
246 if (file_matches_list(elf->filename, qa_execstack)) \
247 continue; \
248 found = found_phdr; \
249 offset = 0; \
250 check_flags = PF_X; \
251 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
252 if (multi_relro++) \
253 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
254 found = found_relro; \
255 offset = 4; \
256 check_flags = PF_X; \
257 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
258 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
259 if (multi_load++ > max_pt_load) \
260 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
261 if (file_matches_list(elf->filename, qa_wx_load)) \
262 continue; \
263 found = found_load; \
264 offset = 8; \
265 check_flags = PF_W|PF_X; \
266 } else \
267 continue; \
268 flags = EGET(phdr[i].p_flags); \
269 if (be_quiet && ((flags & check_flags) != check_flags)) \
270 continue; \
271 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
272 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
273 ret[3] = ret[7] = '!'; \
274 flags = EGET(phdr[i].p_flags); \
275 } \
276 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
277 *found = 1; \
278 ++shown; \
279 } \
280 } else if (elf->shdr != NULL) { \
281 /* no program headers which means this is prob an object file */ \
282 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
283 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
284 char *str; \
285 if ((void*)strtbl > (void*)elf->data_end) \
286 goto skip_this_shdr##B; \
287 check_flags = SHF_WRITE|SHF_EXECINSTR; \
288 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
289 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
290 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
291 str = elf->data + offset; \
292 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
293 if (!strcmp(str, NOTE_GNU_STACK)) { \
294 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
295 flags = EGET(shdr[i].sh_flags); \
296 if (be_quiet && ((flags & check_flags) != check_flags)) \
297 continue; \
298 ++*found_phdr; \
299 shown = 1; \
300 if (flags & SHF_WRITE) ret[0] = 'W'; \
301 if (flags & SHF_ALLOC) ret[1] = 'A'; \
302 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
303 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
304 break; \
305 } \
306 } \
307 skip_this_shdr##B: \
308 if (!multi_stack) { \
309 if (file_matches_list(elf->filename, qa_execstack)) \
310 return NULL; \
311 *found_phdr = 1; \
312 shown = 1; \
313 memcpy(ret, "!WX", 3); \
314 } \
315 } \
316 }
317 SHOW_PHDR(32)
318 SHOW_PHDR(64)
319
320 if (be_wewy_wewy_quiet || (be_quiet && !shown))
321 return NULL;
322 else
323 return ret;
324}
325
326/*
327 * See if this ELF contains a DT_TEXTREL tag in any of its
328 * PT_DYNAMIC sections.
329 */
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 330static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 331{
134 static char *ret = "TEXTREL"; 332 static const char *ret = "TEXTREL";
135 unsigned long i; 333 unsigned long i;
136 334
137 if (!show_textrel) return NULL; 335 if (!show_textrel && !show_textrels) return NULL;
336
337 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 338
139 if (elf->phdr) { 339 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 340#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 341 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 342 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 343 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 344 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 345 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 346 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 347 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
148 offset = EGET(phdr[i].p_offset); \ 348 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 349 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 350 dyn = DYN ## B (elf->data + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 351 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 352 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 353 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 354 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 355 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 356 } \
157 ++dyn; \ 357 ++dyn; \
158 } \ 358 } \
159 } } 359 } }
160 SHOW_TEXTREL(32) 360 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 361 SHOW_TEXTREL(64)
162 } 362 }
163 363
164 if (be_quiet) 364 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 365 return NULL;
166 else 366 else
167 return " - "; 367 return " - ";
168} 368}
369
370/*
371 * Scan the .text section to see if there are any relocations in it.
372 * Should rewrite this to check PT_LOAD sections that are marked
373 * Executable rather than the section named '.text'.
374 */
375static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
376{
377 unsigned long s, r, rmax;
378 void *symtab_void, *strtab_void, *text_void;
379
380 if (!show_textrels) return NULL;
381
382 /* don't search for TEXTREL's if the ELF doesn't have any */
383 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
384 if (!*found_textrel) return NULL;
385
386 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
387 text_void = elf_findsecbyname(elf, ".text");
388
389 if (symtab_void && strtab_void && text_void && elf->shdr) {
390#define SHOW_TEXTRELS(B) \
391 if (elf->elf_class == ELFCLASS ## B) { \
392 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
393 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
394 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
395 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
396 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
397 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
398 uint ## B ## _t memsz = EGET(text->sh_size); \
399 Elf ## B ## _Rel *rel; \
400 Elf ## B ## _Rela *rela; \
401 /* search the section headers for relocations */ \
402 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
403 uint32_t sh_type = EGET(shdr[s].sh_type); \
404 if (sh_type == SHT_REL) { \
405 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
406 rela = NULL; \
407 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
408 } else if (sh_type == SHT_RELA) { \
409 rel = NULL; \
410 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
411 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
412 } else \
413 continue; \
414 /* now see if any of the relocs are in the .text */ \
415 for (r = 0; r < rmax; ++r) { \
416 unsigned long sym_max; \
417 Elf ## B ## _Addr offset_tmp; \
418 Elf ## B ## _Sym *func; \
419 Elf ## B ## _Sym *sym; \
420 Elf ## B ## _Addr r_offset; \
421 uint ## B ## _t r_info; \
422 if (sh_type == SHT_REL) { \
423 r_offset = EGET(rel[r].r_offset); \
424 r_info = EGET(rel[r].r_info); \
425 } else { \
426 r_offset = EGET(rela[r].r_offset); \
427 r_info = EGET(rela[r].r_info); \
428 } \
429 /* make sure this relocation is inside of the .text */ \
430 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
431 if (be_verbose <= 2) continue; \
432 } else \
433 *found_textrels = 1; \
434 /* locate this relocation symbol name */ \
435 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
436 if ((void*)sym > (void*)elf->data_end) { \
437 warn("%s: corrupt ELF symbol", elf->filename); \
438 continue; \
439 } \
440 sym_max = ELF ## B ## _R_SYM(r_info); \
441 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
442 sym += sym_max; \
443 else \
444 sym = NULL; \
445 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
446 /* show the raw details about this reloc */ \
447 printf(" %s: ", elf->base_filename); \
448 if (sym && sym->st_name) \
449 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
450 else \
451 printf("(memory/data?)"); \
452 printf(" [0x%lX]", (unsigned long)r_offset); \
453 /* now try to find the closest symbol that this rel is probably in */ \
454 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
455 func = NULL; \
456 offset_tmp = 0; \
457 while (sym_max--) { \
458 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
459 func = sym; \
460 offset_tmp = EGET(sym->st_value); \
461 } \
462 ++sym; \
463 } \
464 printf(" in "); \
465 if (func && func->st_name) { \
466 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
467 if (r_offset > EGET(func->st_size)) \
468 printf("(optimized out: previous %s)", func_name); \
469 else \
470 printf("%s", func_name); \
471 } else \
472 printf("(optimized out)"); \
473 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
474 if (be_verbose && has_objdump) { \
475 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
476 char *sysbuf; \
477 size_t syslen; \
478 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"; \
479 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
480 sysbuf = xmalloc(syslen); \
481 if (end_addr < r_offset) \
482 /* not uncommon when things are optimized out */ \
483 end_addr = r_offset + 0x100; \
484 snprintf(sysbuf, syslen, sysfmt, \
485 (unsigned long)offset_tmp, \
486 (unsigned long)end_addr, \
487 elf->filename, \
488 (unsigned long)r_offset); \
489 fflush(stdout); \
490 system(sysbuf); \
491 fflush(stdout); \
492 free(sysbuf); \
493 } \
494 } \
495 } }
496 SHOW_TEXTRELS(32)
497 SHOW_TEXTRELS(64)
498 }
499 if (!*found_textrels)
500 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
501
502 return NULL;
503}
504
505static void rpath_security_checks(elfobj *, char *, const char *);
506static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
507{
508 struct stat st;
509 switch (*item) {
510 case '/': break;
511 case '.':
512 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
513 break;
514 case ':':
515 case '\0':
516 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
517 break;
518 case '$':
519 if (fstat(elf->fd, &st) != -1)
520 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
521 warnf("Security problem with %s='%s' in %s with mode set of %o",
522 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
523 break;
524 default:
525 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
526 break;
527 }
528}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 529static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 530{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 531 unsigned long i, s;
173 char *rpath, *runpath; 532 char *rpath, *runpath, **r;
174 void *strtbl_void; 533 void *strtbl_void;
175 534
176 if (!show_rpath) return; 535 if (!show_rpath) return;
177 536
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 537 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 543 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 544 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 545 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 546 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 547 Elf ## B ## _Off offset; \
548 Elf ## B ## _Xword word; \
549 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 550 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
551 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 552 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
191 offset = EGET(phdr[i].p_offset); \ 553 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 554 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
555 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 556 dyn = DYN ## B (elf->data + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 557 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 558 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 559 r = &rpath; \
560 } else if (word == DT_RUNPATH) { \
561 r = &runpath; \
562 } else { \
563 ++dyn; \
564 continue; \
565 } \
566 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 567 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 568 if (offset < (Elf ## B ## _Off)elf->len) { \
569 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 570 *r = (char*)(elf->data + offset); \
571 /* cache the length in case we need to nuke this section later on */ \
572 if (fix_elf) \
573 offset = strlen(*r); \
574 /* If quiet, don't output paths in ld.so.conf */ \
575 if (be_quiet) { \
576 size_t len; \
577 char *start, *end; \
578 /* note that we only 'chop' off leading known paths. */ \
579 /* since *r is read-only memory, we can only move the ptr forward. */ \
580 start = *r; \
581 /* scan each path in : delimited list */ \
582 while (start) { \
583 rpath_security_checks(elf, start, get_elfdtype(word)); \
584 end = strchr(start, ':'); \
585 len = (end ? abs(end - start) : strlen(start)); \
586 if (use_ldcache) \
587 for (s = 0; ldpaths[s]; ++s) \
588 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
589 *r = end; \
590 /* corner case ... if RPATH reads "/usr/lib:", we want \
591 * to show ':' rather than '' */ \
592 if (end && end[1] != '\0') \
593 (*r)++; \
594 break; \
595 } \
596 if (!*r || !end) \
597 break; \
598 else \
599 start = start + len + 1; \
600 } \
601 } \
602 if (*r) { \
603 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
604 /* just nuke it */ \
605 nuke_it##B: \
606 memset(*r, 0x00, offset); \
607 *r = NULL; \
608 ESET(dyn->d_tag, DT_DEBUG); \
609 ESET(dyn->d_un.d_ptr, 0); \
610 } else if (fix_elf) { \
611 /* try to clean "bad" paths */ \
612 size_t len, tmpdir_len; \
613 char *start, *end; \
614 const char *tmpdir; \
615 start = *r; \
616 tmpdir = (getenv("TMPDIR") ? : "."); \
617 tmpdir_len = strlen(tmpdir); \
618 while (1) { \
619 end = strchr(start, ':'); \
620 if (start == end) { \
621 eat_this_path##B: \
622 len = strlen(end); \
623 memmove(start, end+1, len); \
624 start[len-1] = '\0'; \
625 end = start - 1; \
626 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
627 if (!end) { \
628 if (start == *r) \
629 goto nuke_it##B; \
630 *--start = '\0'; \
631 } else \
632 goto eat_this_path##B; \
633 } \
634 if (!end) \
635 break; \
636 start = end + 1; \
637 } \
638 if (**r == '\0') \
639 goto nuke_it##B; \
640 } \
641 if (*r) \
200 *found_rpath = 1; \ 642 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 643 } \
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 } \ 644 } \
208 ++dyn; \ 645 ++dyn; \
209 } \ 646 } \
210 } } 647 } }
211 SHOW_RPATH(32) 648 SHOW_RPATH(32)
212 SHOW_RPATH(64) 649 SHOW_RPATH(64)
213 } 650 }
651
652 if (be_wewy_wewy_quiet) return;
214 653
215 if (rpath && runpath) { 654 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 655 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 656 xstrcat(ret, runpath, ret_len);
218 } else { 657 } else {
226 } else if (rpath || runpath) 665 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 666 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 667 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 668 xstrcat(ret, " - ", ret_len);
230} 669}
670
671#define LDSO_CACHE_MAGIC "ld.so-"
672#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
673#define LDSO_CACHE_VER "1.7.0"
674#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
675#define FLAG_ANY -1
676#define FLAG_TYPE_MASK 0x00ff
677#define FLAG_LIBC4 0x0000
678#define FLAG_ELF 0x0001
679#define FLAG_ELF_LIBC5 0x0002
680#define FLAG_ELF_LIBC6 0x0003
681#define FLAG_REQUIRED_MASK 0xff00
682#define FLAG_SPARC_LIB64 0x0100
683#define FLAG_IA64_LIB64 0x0200
684#define FLAG_X8664_LIB64 0x0300
685#define FLAG_S390_LIB64 0x0400
686#define FLAG_POWERPC_LIB64 0x0500
687#define FLAG_MIPS64_LIBN32 0x0600
688#define FLAG_MIPS64_LIBN64 0x0700
689
690static char *lookup_cache_lib(elfobj *, char *);
691
692#if defined(__GLIBC__) || defined(__UCLIBC__)
693
694static char *lookup_cache_lib(elfobj *elf, char *fname)
695{
696 int fd = 0;
697 char *strs;
698 static char buf[__PAX_UTILS_PATH_MAX] = "";
699 const char *cachefile = "/etc/ld.so.cache";
700 struct stat st;
701
702 typedef struct {
703 char magic[LDSO_CACHE_MAGIC_LEN];
704 char version[LDSO_CACHE_VER_LEN];
705 int nlibs;
706 } header_t;
707 header_t *header;
708
709 typedef struct {
710 int flags;
711 int sooffset;
712 int liboffset;
713 } libentry_t;
714 libentry_t *libent;
715
716 if (fname == NULL)
717 return NULL;
718
719 if (ldcache == 0) {
720 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
721 return NULL;
722
723 /* cache these values so we only map/unmap the cache file once */
724 ldcache_size = st.st_size;
725 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
726
727 close(fd);
728
729 if (ldcache == MAP_FAILED) {
730 ldcache = 0;
731 return NULL;
732 }
733
734 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
735 return NULL;
736 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
737 return NULL;
738 }
739
740 header = (header_t *) ldcache;
741 libent = (libentry_t *) (ldcache + sizeof(header_t));
742 strs = (char *) &libent[header->nlibs];
743
744 for (fd = 0; fd < header->nlibs; fd++) {
745 /* this should be more fine grained, but for now we assume that
746 * diff arches will not be cached together. and we ignore the
747 * the different multilib mips cases. */
748 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
749 continue;
750 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
751 continue;
752
753 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
754 continue;
755 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
756 }
757 return buf;
758}
759#elif defined(__NetBSD__)
760static char *lookup_cache_lib(elfobj *elf, char *fname)
761{
762 static char buf[__PAX_UTILS_PATH_MAX] = "";
763 static struct stat st;
764
765 char **ldpath;
766 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
767 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
768 continue; /* if the pathname is too long, or something went wrong, ignore */
769
770 if (stat(buf, &st) != 0)
771 continue; /* if the lib doesn't exist in *ldpath, look further */
772
773 /* NetBSD doesn't actually do sanity checks, it just loads the file
774 * and if that doesn't work, continues looking in other directories.
775 * This cannot easily be safely emulated, unfortunately. For now,
776 * just assume that if it exists, it's a valid library. */
777
778 return buf;
779 }
780
781 /* not found in any path */
782 return NULL;
783}
784#else
785#ifdef __ELF__
786#warning Cache support not implemented for your target
787#endif
788static char *lookup_cache_lib(elfobj *elf, char *fname)
789{
790 return NULL;
791}
792#endif
793
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 794static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 795{
233 unsigned long i; 796 unsigned long i;
234 char *needed; 797 char *needed;
235 void *strtbl_void; 798 void *strtbl_void;
799 char *p;
236 800
237 if (!show_needed) return; 801 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
238 802
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 803 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 804
241 if (elf->phdr && strtbl_void) { 805 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 806#define SHOW_NEEDED(B) \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 809 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 810 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 811 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
248 Elf ## B ## _Off offset; \ 812 Elf ## B ## _Off offset; \
249 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 813 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
250 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 814 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
251 offset = EGET(phdr[i].p_offset); \ 815 offset = EGET(phdr[i].p_offset); \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 816 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
253 dyn = DYN ## B (elf->data + offset); \ 817 dyn = DYN ## B (elf->data + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 818 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 819 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 820 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 821 if (offset >= (Elf ## B ## _Off)elf->len) { \
822 ++dyn; \
823 continue; \
824 } \
258 needed = (char*)(elf->data + offset); \ 825 needed = (char*)(elf->data + offset); \
826 if (op == 0) { \
827 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 828 if (*found_needed) xchrcat(ret, ',', ret_len); \
829 if (use_ldcache) \
830 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
831 needed = p; \
260 xstrcat(ret, needed, ret_len); \ 832 xstrcat(ret, needed, ret_len); \
833 } \
261 *found_needed = 1; \ 834 *found_needed = 1; \
835 } else { \
836 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
837 *found_lib = 1; \
838 return (be_wewy_wewy_quiet ? NULL : needed); \
839 } \
840 } \
262 } \ 841 } \
263 ++dyn; \ 842 ++dyn; \
264 } \ 843 } \
265 } } 844 } }
266 SHOW_NEEDED(32) 845 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 846 SHOW_NEEDED(64)
847 if (op == 0 && !*found_needed && be_verbose)
848 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 849 }
850
851 return NULL;
269} 852}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 853static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 854{
272 void *strtbl_void; 855 void *strtbl_void;
273 856
278 if (strtbl_void) { 861 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 862#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 863 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 864 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 865 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 866 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 867 }
285 SHOW_INTERP(32) 868 SHOW_INTERP(32)
286 SHOW_INTERP(64) 869 SHOW_INTERP(64)
287 } 870 }
288 return NULL; 871 return NULL;
289} 872}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 873static char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 874{
292 unsigned long i; 875 unsigned long i;
876 struct stat s;
877 char dynamic = 0;
878
879 if (!show_bind) return NULL;
880 if (!elf->phdr) return NULL;
881
882#define SHOW_BIND(B) \
883 if (elf->elf_class == ELFCLASS ## B) { \
884 Elf ## B ## _Dyn *dyn; \
885 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
886 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
887 Elf ## B ## _Off offset; \
888 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
889 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
890 dynamic = 1; \
891 offset = EGET(phdr[i].p_offset); \
892 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
893 dyn = DYN ## B (elf->data + offset); \
894 while (EGET(dyn->d_tag) != DT_NULL) { \
895 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
896 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
897 { \
898 if (be_quiet) return NULL; \
899 *found_bind = 1; \
900 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
901 } \
902 ++dyn; \
903 } \
904 } \
905 }
906 SHOW_BIND(32)
907 SHOW_BIND(64)
908
909 if (be_wewy_wewy_quiet) return NULL;
910
911 /* don't output anything if quiet mode and the ELF is static or not setuid */
912 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
913 return NULL;
914 } else {
915 *found_bind = 1;
916 return (char *) (dynamic ? "LAZY" : "STATIC");
917 }
918}
919static char *scanelf_file_soname(elfobj *elf, char *found_soname)
920{
921 unsigned long i;
922 char *soname;
923 void *strtbl_void;
924
925 if (!show_soname) return NULL;
926
927 strtbl_void = elf_findsecbyname(elf, ".dynstr");
928
929 if (elf->phdr && strtbl_void) {
930#define SHOW_SONAME(B) \
931 if (elf->elf_class == ELFCLASS ## B) { \
932 Elf ## B ## _Dyn *dyn; \
933 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
934 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
935 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
936 Elf ## B ## _Off offset; \
937 /* only look for soname in shared objects */ \
938 if (EGET(ehdr->e_type) != ET_DYN) \
939 return NULL; \
940 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
941 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
942 offset = EGET(phdr[i].p_offset); \
943 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
944 dyn = DYN ## B (elf->data + offset); \
945 while (EGET(dyn->d_tag) != DT_NULL) { \
946 if (EGET(dyn->d_tag) == DT_SONAME) { \
947 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
948 if (offset >= (Elf ## B ## _Off)elf->len) { \
949 ++dyn; \
950 continue; \
951 } \
952 soname = (char*)(elf->data + offset); \
953 *found_soname = 1; \
954 return (be_wewy_wewy_quiet ? NULL : soname); \
955 } \
956 ++dyn; \
957 } \
958 } }
959 SHOW_SONAME(32)
960 SHOW_SONAME(64)
961 }
962
963 return NULL;
964}
965
966static int scanelf_match_symname(const char *symname, const char *tomatch) {
967 /* We do things differently when checking with regexp */
968 if (g_match) {
969 return rematch(symname, tomatch, REG_EXTENDED) == 0;
970 } else {
971 const size_t symname_len = strlen(symname);
972 return (strncmp(symname, tomatch, symname_len) == 0 &&
973 /* Accept unversioned symbol names */
974 (tomatch[symname_len] == '\0' || tomatch[symname_len] == '@'));
975 }
976}
977
978static char *scanelf_file_sym(elfobj *elf, char *found_sym)
979{
980 unsigned long i;
981 char *ret;
293 void *symtab_void, *strtab_void; 982 void *symtab_void, *strtab_void;
294 983
295 if (!find_sym) return NULL; 984 if (!find_sym) return NULL;
985 ret = find_sym;
296 986
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 987 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 988
300 if (symtab_void && strtab_void) { 989 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 990#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 991 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 992 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 993 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 994 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 995 unsigned long cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 996 char *symname; \
997 if (cnt) \
998 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 999 for (i = 0; i < cnt; ++i) { \
1000 if ((void*)sym > (void*)elf->data_end) { \
1001 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1002 goto break_out; \
1003 } \
309 if (sym->st_name) { \ 1004 if (sym->st_name) { \
1005 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1006 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
311 if (*find_sym == '*') { \ 1007 if ((void*)symname > (void*)elf->data_end) { \
1008 warnf("%s: corrupt ELF symbols", elf->filename); \
1009 ++sym; \
1010 continue; \
1011 } \
1012 /* debug display ... show all symbols and some extra info */ \
1013 if (0 && g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
312 printf("%s(%s) %5lX %15s %s\n", \ 1014 printf("%s(%s) %5lX %15s %s %s\n", \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1015 ((*found_sym == 0) ? "\n\t" : "\t"), \
314 (char *)basename(filename), \ 1016 elf->base_filename, \
315 (long)sym->st_size, \ 1017 (unsigned long)sym->st_size, \
316 (char *)get_elfstttype(sym->st_info), \ 1018 get_elfstttype(sym->st_info), \
317 symname); \ 1019 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
318 *found_sym = 1; \ 1020 *found_sym = 1; \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 1021 } else { \
320 (strcmp(symname, versioned_symname) == 0)) \ 1022 /* allow the user to specify a comma delimited list of symbols to search for */ \
1023 char *this_sym, *next_sym; \
1024 next_sym = ret; \
1025 while (next_sym) { \
1026 this_sym = next_sym; \
1027 if ((next_sym = strchr(this_sym, ','))) \
1028 next_sym += 1; /* Skip the comma */ \
1029 /* do we want a defined symbol ? */ \
1030 if (*this_sym == '+') { \
1031 if (sym->st_shndx == SHN_UNDEF) \
1032 continue; \
1033 ++this_sym; \
1034 /* do we want an undefined symbol ? */ \
1035 } else if (*this_sym == '-') { \
1036 if (sym->st_shndx != SHN_UNDEF) \
1037 continue; \
1038 ++this_sym; \
1039 } \
1040 if (next_sym) /* Copy it so that we don't have to worry about the final , */ \
1041 this_sym = xstrndup(this_sym, next_sym-this_sym); \
1042 /* ok, lets compare the name now */ \
1043 if (scanelf_match_symname(this_sym, symname)) { \
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 = symname; \
321 (*found_sym)++; \ 1051 (*found_sym)++; \
1052 goto break_out; \
1053 } \
1054 if (next_sym) free(this_sym); \
1055 } \
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 = strfileperms(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", (unsigned long)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 = 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; 1767 break;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1768 }
645 sprintf(versioned_symname, "%s@", find_sym); 1769 case 'N': {
1770 if (find_lib) warn("You prob don't want to specify -N twice");
1771 find_lib = optarg;
646 break; 1772 break;
647 } 1773 }
648 1774
649 case 'F': { 1775 case 'F': {
1776 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 1777 out_format = optarg;
1778 break;
1779 }
1780 case 'z': {
1781 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1782 size_t x;
1783
1784 for (x = 0; x < strlen(optarg); x++) {
1785 switch (optarg[x]) {
1786 case 'p':
1787 case 'P':
1788 do_pax_state(optarg[x], PAGEEXEC);
651 break; 1789 break;
1790 case 's':
1791 case 'S':
1792 do_pax_state(optarg[x], SEGMEXEC);
1793 break;
1794 case 'm':
1795 case 'M':
1796 do_pax_state(optarg[x], MPROTECT);
1797 break;
1798 case 'e':
1799 case 'E':
1800 do_pax_state(optarg[x], EMUTRAMP);
1801 break;
1802 case 'r':
1803 case 'R':
1804 do_pax_state(optarg[x], RANDMMAP);
1805 break;
1806 case 'x':
1807 case 'X':
1808 do_pax_state(optarg[x], RANDEXEC);
1809 break;
1810 default:
1811 break;
1812 }
652 } 1813 }
653 1814 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1815 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1816 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1817 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1818 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1819 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1820 setpax = flags;
1821 break;
1822 }
1823 case 'Z': show_size = 1; break;
1824 case 'g': g_match = 1; break;
1825 case 'L': use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 1826 case 'y': scan_symlink = 0; break;
1827 case 'A': scan_archives = 1; break;
655 case 'B': show_banner = 0; break; 1828 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 1829 case 'l': scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 1830 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 1831 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 1832 case 'm': dir_crossmount = 0; break;
1833 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 1834 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 1835 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 1836 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 1837 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 1838 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 1839 case 'i': show_interp = 1; break;
1840 case 'b': show_bind = 1; break;
1841 case 'S': show_soname = 1; break;
1842 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 1843 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1844 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; 1845 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
669 1846 case 'D': show_endian = 1; break;
1847 case 'I': show_osabi = 1; break;
1848 case 'Y': show_eabi = 1; break;
670 case ':': 1849 case ':':
671 warn("Option missing parameter\n"); 1850 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 1851 case '?':
675 warn("Unknown option\n"); 1852 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 1853 default:
679 err("Unhandled option '%c'", flag); 1854 err("Unhandled option '%c'; please report this", i);
680 break;
681 }
682 } 1855 }
683 1856 }
684 if (be_quiet && be_verbose) 1857 if (show_textrels && be_verbose) {
685 err("You can be quiet or you can be verbose, not both, stupid"); 1858 if (which("objdump") != NULL)
686 1859 has_objdump = 1;
1860 }
687 /* let the format option override all other options */ 1861 /* let the format option override all other options */
688 if (out_format) { 1862 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1863 show_pax = show_phdr = show_textrel = show_rpath = \
1864 show_needed = show_interp = show_bind = show_soname = \
1865 show_textrels = show_perms = show_endian = show_size = \
1866 show_osabi = show_eabi = 0;
690 for (flag=0; out_format[flag]; ++flag) { 1867 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 1868 if (!IS_MODIFIER(out_format[i])) continue;
692 1869
693 switch (out_format[++flag]) { 1870 switch (out_format[++i]) {
1871 case '+': break;
694 case '%': break; 1872 case '%': break;
1873 case '#': break;
695 case 'F': break; 1874 case 'F': break;
1875 case 'p': break;
1876 case 'f': break;
1877 case 'k': break;
696 case 's': break; 1878 case 's': break;
1879 case 'N': break;
697 case 'o': break; 1880 case 'o': break;
1881 case 'a': break;
1882 case 'M': break;
1883 case 'Z': show_size = 1; break;
1884 case 'D': show_endian = 1; break;
1885 case 'I': show_osabi = 1; break;
1886 case 'Y': show_eabi = 1; break;
1887 case 'O': show_perms = 1; break;
698 case 'x': show_pax = 1; break; 1888 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 1889 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 1890 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 1891 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 1892 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 1893 case 'i': show_interp = 1; break;
1894 case 'b': show_bind = 1; break;
1895 case 'S': show_soname = 1; break;
1896 case 'T': show_textrels = 1; break;
704 default: 1897 default:
705 err("Invalid format specifier '%c' (byte %i)", 1898 err("Invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 1899 out_format[i], i+1);
707 } 1900 }
708 } 1901 }
709 1902
710 /* construct our default format */ 1903 /* construct our default format */
711 } else { 1904 } else {
712 size_t fmt_len = 30; 1905 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1906 out_format = xmalloc(sizeof(char) * fmt_len);
1907 *out_format = '\0';
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1908 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1909 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1910 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1911 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1912 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1913 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
1914 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1915 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1916 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1917 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1918 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1919 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1920 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1921 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1922 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1923 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1924 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1925 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1926 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 1927 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 1928 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 1929
726 /* now lets actually do the scanning */ 1930 /* now lets actually do the scanning */
1931 if (scan_ldpath || use_ldcache)
1932 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 1933 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 1934 if (scan_envpath) scanelf_envpath();
1935 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1936 from_file = "-";
1937 if (from_file) {
1938 scanelf_from_file(from_file);
1939 from_file = *argv;
1940 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 1941 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 1942 err("Nothing to scan !?");
731 while (optind < argc) 1943 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 1944 search_path = argv[optind++];
1945 ret = scanelf_dir(search_path);
1946 }
733 1947
734 /* clean up */ 1948 /* clean up */
735 if (find_sym) { 1949 for (i = 0; ldpaths[i]; ++i)
736 free(find_sym); 1950 free(ldpaths[i]);
737 free(versioned_symname);
738 }
739 if (out_format) free(out_format);
740}
741 1951
742 1952 if (ldcache != 0)
743 1953 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; 1954 return ret;
750} 1955}
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 1956
761 new_len = strlen(*dst) + strlen(src); 1957static 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{ 1958{
773 static char my_app[2]; 1959 const char *delims = " \t\n";
774 my_app[0] = append; 1960 char **envvals = NULL;
775 my_app[1] = '\0'; 1961 char *env, *s;
776 xstrcat(dst, my_app, curr_len); 1962 int nentry;
777} 1963
778static int xemptybuffer(const char *buff) 1964 if ((env = getenv(envvar)) == NULL)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0; 1965 return NULL;
1966
1967 env = xstrdup(env);
1968 if (env == NULL)
784 return 1; 1969 return NULL;
785}
786 1970
1971 s = strtok(env, delims);
1972 if (s == NULL) {
1973 free(env);
1974 return NULL;
1975 }
787 1976
1977 nentry = 0;
1978 while (s != NULL) {
1979 ++nentry;
1980 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1981 envvals[nentry-1] = s;
1982 s = strtok(NULL, delims);
1983 }
1984 envvals[nentry] = NULL;
1985
1986 /* don't want to free(env) as it contains the memory that backs
1987 * the envvals array of strings */
1988 return envvals;
1989}
1990
1991static void parseenv(void)
1992{
1993 qa_textrels = get_split_env("QA_TEXTRELS");
1994 qa_execstack = get_split_env("QA_EXECSTACK");
1995 qa_wx_load = get_split_env("QA_WX_LOAD");
1996}
1997
1998#ifdef __PAX_UTILS_CLEANUP
1999static void cleanup(void)
2000{
2001 free(out_format);
2002 free(qa_textrels);
2003 free(qa_execstack);
2004 free(qa_wx_load);
2005}
2006#endif
788 2007
789int main(int argc, char *argv[]) 2008int main(int argc, char *argv[])
790{ 2009{
2010 int ret;
791 if (argc < 2) 2011 if (argc < 2)
792 usage(EXIT_FAILURE); 2012 usage(EXIT_FAILURE);
2013 parseenv();
793 parseargs(argc, argv); 2014 ret = parseargs(argc, argv);
794 fclose(stdout); 2015 fclose(stdout);
795 return EXIT_SUCCESS; 2016#ifdef __PAX_UTILS_CLEANUP
2017 cleanup();
2018 warn("The calls to add/delete heap should be off:\n"
2019 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2020 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2021#endif
2022 return ret;
796} 2023}
2024
2025/* Match filename against entries in matchlist, return TRUE
2026 * if the file is listed */
2027static int file_matches_list(const char *filename, char **matchlist)
2028{
2029 char **file;
2030 char *match;
2031 char buf[__PAX_UTILS_PATH_MAX];
2032
2033 if (matchlist == NULL)
2034 return 0;
2035
2036 for (file = matchlist; *file != NULL; file++) {
2037 if (search_path) {
2038 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2039 match = buf;
2040 } else {
2041 match = *file;
2042 }
2043 if (fnmatch(match, filename, 0) == 0)
2044 return 1;
2045 }
2046 return 0;
2047}

Legend:
Removed from v.1.44  
changed lines
  Added in v.1.208

  ViewVC Help
Powered by ViewVC 1.1.20