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Revision 1.44 Revision 1.231
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 1.231 2011/09/27 19:58:09 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> 10static const char rcsid[] = "$Id: scanelf.c,v 1.231 2011/09/27 19:58:09 vapier Exp $";
25#include <stdlib.h> 11const char argv0[] = "scanelf";
26#include <sys/types.h>
27#define __USE_GNU
28#include <string.h>
29#include <errno.h>
30#include <unistd.h>
31#include <sys/stat.h>
32#include <dirent.h>
33#include <getopt.h>
34#include <assert.h>
35 12
36#include "paxelf.h" 13#include "paxinc.h"
37 14
38static const char *rcsid = "$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);
45static void scanelf_dir(const char *path);
46static void scanelf_ldpath();
47static void scanelf_envpath();
48static void usage(int status);
49static void parseargs(int argc, char *argv[]);
50static char *xstrdup(char *s);
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 19
56/* variables to control behavior */ 20/* variables to control behavior */
21static char *match_etypes = NULL;
22static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
57static char scan_ldpath = 0; 23static char scan_ldpath = 0;
58static char scan_envpath = 0; 24static char scan_envpath = 0;
59static char scan_symlink = 1; 25static char scan_symlink = 1;
26static char scan_archives = 0;
60static char dir_recurse = 0; 27static char dir_recurse = 0;
61static char dir_crossmount = 1; 28static char dir_crossmount = 1;
62static char show_pax = 0; 29static char show_pax = 0;
30static char show_perms = 0;
63static char show_stack = 0; 31static char show_size = 0;
32static char show_phdr = 0;
64static char show_textrel = 0; 33static char show_textrel = 0;
65static char show_rpath = 0; 34static char show_rpath = 0;
66static char show_needed = 0; 35static char show_needed = 0;
67static char show_interp = 0; 36static char show_interp = 0;
37static char show_bind = 0;
38static char show_soname = 0;
39static char show_textrels = 0;
68static char show_banner = 1; 40static char show_banner = 1;
41static char show_endian = 0;
42static char show_osabi = 0;
43static char show_eabi = 0;
69static char be_quiet = 0; 44static char be_quiet = 0;
70static char be_verbose = 0; 45static char be_verbose = 0;
71static char *find_sym = NULL, *versioned_symname = NULL; 46static char be_wewy_wewy_quiet = 0;
47static char be_semi_verbose = 0;
48static char *find_sym = NULL;
49static char *find_lib = NULL;
50static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51static char *find_section = NULL;
52static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
72static char *out_format = NULL; 53static char *out_format = NULL;
54static char *search_path = NULL;
55static char fix_elf = 0;
56static char g_match = 0;
57static char use_ldcache = 0;
73 58
59static char **qa_textrels = NULL;
60static char **qa_execstack = NULL;
61static char **qa_wx_load = NULL;
62static char *root;
74 63
64static int match_bits = 0;
65static unsigned int match_perms = 0;
66static void *ldcache = NULL;
67static size_t ldcache_size = 0;
68static unsigned long setpax = 0UL;
69
70static int has_objdump = 0;
71
72/* find the path to a file by name */
73static int bin_in_path(const char *fname)
74{
75 char fullpath[__PAX_UTILS_PATH_MAX];
76 char *path, *p;
77
78 path = getenv("PATH");
79 if (!path)
80 return 0;
81
82 while ((p = strrchr(path, ':')) != NULL) {
83 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
84 *p = 0;
85 if (access(fullpath, R_OK) != -1)
86 return 1;
87 }
88
89 return 0;
90}
91
92/* 1 on failure. 0 otherwise */
93static int rematch(const char *regex, const char *match, int cflags)
94{
95 regex_t preg;
96 int ret;
97
98 if ((match == NULL) || (regex == NULL))
99 return EXIT_FAILURE;
100
101 if ((ret = regcomp(&preg, regex, cflags))) {
102 char err[256];
103
104 if (regerror(ret, &preg, err, sizeof(err)))
105 fprintf(stderr, "regcomp failed: %s", err);
106 else
107 fprintf(stderr, "regcomp failed");
108
109 return EXIT_FAILURE;
110 }
111 ret = regexec(&preg, match, 0, NULL, 0);
112 regfree(&preg);
113
114 return ret;
115}
75 116
76/* sub-funcs for scanelf_file() */ 117/* sub-funcs for scanelf_file() */
118static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
119{
120 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
121
122 /* debug sections */
123 void *symtab = elf_findsecbyname(elf, ".symtab");
124 void *strtab = elf_findsecbyname(elf, ".strtab");
125 /* runtime sections */
126 void *dynsym = elf_findsecbyname(elf, ".dynsym");
127 void *dynstr = elf_findsecbyname(elf, ".dynstr");
128
129#define GET_SYMTABS(B) \
130 if (elf->elf_class == ELFCLASS ## B) { \
131 if (symtab && dynsym) { \
132 Elf ## B ## _Shdr *esymtab = symtab; \
133 Elf ## B ## _Shdr *edynsym = dynsym; \
134 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
135 } else \
136 *sym = symtab ? symtab : dynsym; \
137 if (strtab && dynstr) { \
138 Elf ## B ## _Shdr *estrtab = strtab; \
139 Elf ## B ## _Shdr *edynstr = dynstr; \
140 *tab = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
141 } else \
142 *tab = strtab ? strtab : dynstr; \
143 }
144 GET_SYMTABS(32)
145 GET_SYMTABS(64)
146}
147
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 148static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 149{
79 static char *paxflags; 150 static char ret[7];
151 unsigned long i, shown;
80 152
81 if (!show_pax) return NULL; 153 if (!show_pax) return NULL;
82 154
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; 155 shown = 0;
100 strcpy(ret, "--- ---"); 156 memset(&ret, 0, sizeof(ret));
101 157
102 if (elf->phdr) { 158 if (elf->phdr) {
103#define SHOW_STACK(B) \ 159#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 160 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 163 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 164 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; \ 165 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 166 if (fix_elf && setpax) { \
167 /* set the paxctl flags */ \
168 ESET(phdr[i].p_flags, setpax); \
169 } \
170 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 171 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 172 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 173 *found_pax = 1; \
120 ++shown; \ 174 ++shown; \
175 break; \
121 } \ 176 } \
122 } 177 }
123 SHOW_STACK(32) 178 SHOW_PAX(32)
124 SHOW_STACK(64) 179 SHOW_PAX(64)
180 }
181
182 if (fix_elf && setpax) {
183 /* set the chpax settings */
184 if (elf->elf_class == ELFCLASS32) {
185 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
186 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
187 } else {
188 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
189 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
125 } 190 }
191 }
126 192
127 if (be_quiet && !shown) 193 /* fall back to EI_PAX if no PT_PAX was found */
194 if (!*ret) {
195 static char *paxflags;
196 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
197 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
198 *found_pax = 1;
199 return (be_wewy_wewy_quiet ? NULL : paxflags);
200 }
201 strncpy(ret, paxflags, sizeof(ret));
202 }
203
204 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 205 return NULL;
129 else 206 else
130 return ret; 207 return ret;
131} 208}
209
210static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
211{
212 static char ret[12];
213 char *found;
214 unsigned long i, shown, multi_stack, multi_relro, multi_load;
215 int max_pt_load;
216
217 if (!show_phdr) return NULL;
218
219 memcpy(ret, "--- --- ---\0", 12);
220
221 shown = 0;
222 multi_stack = multi_relro = multi_load = 0;
223 max_pt_load = elf_max_pt_load(elf);
224
225#define NOTE_GNU_STACK ".note.GNU-stack"
226#define SHOW_PHDR(B) \
227 if (elf->elf_class == ELFCLASS ## B) { \
228 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
229 Elf ## B ## _Off offset; \
230 uint32_t flags, check_flags; \
231 if (elf->phdr != NULL) { \
232 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
233 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
234 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
235 if (multi_stack++) \
236 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
237 if (file_matches_list(elf->filename, qa_execstack)) \
238 continue; \
239 found = found_phdr; \
240 offset = 0; \
241 check_flags = PF_X; \
242 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
243 if (multi_relro++) \
244 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
245 found = found_relro; \
246 offset = 4; \
247 check_flags = PF_X; \
248 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
249 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
250 if (multi_load++ > max_pt_load) \
251 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
252 if (file_matches_list(elf->filename, qa_wx_load)) \
253 continue; \
254 found = found_load; \
255 offset = 8; \
256 check_flags = PF_W|PF_X; \
257 } else \
258 continue; \
259 flags = EGET(phdr[i].p_flags); \
260 if (be_quiet && ((flags & check_flags) != check_flags)) \
261 continue; \
262 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
263 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
264 ret[3] = ret[7] = '!'; \
265 flags = EGET(phdr[i].p_flags); \
266 } \
267 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
268 *found = 1; \
269 ++shown; \
270 } \
271 } else if (elf->shdr != NULL) { \
272 /* no program headers which means this is prob an object file */ \
273 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
274 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
275 char *str; \
276 if ((void*)strtbl > elf->data_end) \
277 goto skip_this_shdr##B; \
278 check_flags = SHF_WRITE|SHF_EXECINSTR; \
279 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
280 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
281 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
282 str = elf->data + offset; \
283 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
284 if (!strcmp(str, NOTE_GNU_STACK)) { \
285 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
286 flags = EGET(shdr[i].sh_flags); \
287 if (be_quiet && ((flags & check_flags) != check_flags)) \
288 continue; \
289 ++*found_phdr; \
290 shown = 1; \
291 if (flags & SHF_WRITE) ret[0] = 'W'; \
292 if (flags & SHF_ALLOC) ret[1] = 'A'; \
293 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
294 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
295 break; \
296 } \
297 } \
298 skip_this_shdr##B: \
299 if (!multi_stack) { \
300 if (file_matches_list(elf->filename, qa_execstack)) \
301 return NULL; \
302 *found_phdr = 1; \
303 shown = 1; \
304 memcpy(ret, "!WX", 3); \
305 } \
306 } \
307 }
308 SHOW_PHDR(32)
309 SHOW_PHDR(64)
310
311 if (be_wewy_wewy_quiet || (be_quiet && !shown))
312 return NULL;
313 else
314 return ret;
315}
316
317/*
318 * See if this ELF contains a DT_TEXTREL tag in any of its
319 * PT_DYNAMIC sections.
320 */
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 321static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 322{
134 static char *ret = "TEXTREL"; 323 static const char *ret = "TEXTREL";
135 unsigned long i; 324 unsigned long i;
136 325
137 if (!show_textrel) return NULL; 326 if (!show_textrel && !show_textrels) return NULL;
327
328 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 329
139 if (elf->phdr) { 330 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 331#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 332 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 333 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 334 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 335 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 336 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 337 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 338 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
148 offset = EGET(phdr[i].p_offset); \ 339 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 340 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 341 dyn = DYN ## B (elf->vdata + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 342 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 343 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 344 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 345 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 346 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 347 } \
157 ++dyn; \ 348 ++dyn; \
158 } \ 349 } \
159 } } 350 } }
160 SHOW_TEXTREL(32) 351 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 352 SHOW_TEXTREL(64)
162 } 353 }
163 354
164 if (be_quiet) 355 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 356 return NULL;
166 else 357 else
167 return " - "; 358 return " - ";
168} 359}
360
361/*
362 * Scan the .text section to see if there are any relocations in it.
363 * Should rewrite this to check PT_LOAD sections that are marked
364 * Executable rather than the section named '.text'.
365 */
366static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
367{
368 unsigned long s, r, rmax;
369 void *symtab_void, *strtab_void, *text_void;
370
371 if (!show_textrels) return NULL;
372
373 /* don't search for TEXTREL's if the ELF doesn't have any */
374 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
375 if (!*found_textrel) return NULL;
376
377 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
378 text_void = elf_findsecbyname(elf, ".text");
379
380 if (symtab_void && strtab_void && text_void && elf->shdr) {
381#define SHOW_TEXTRELS(B) \
382 if (elf->elf_class == ELFCLASS ## B) { \
383 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
384 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
385 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
386 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
387 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
388 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
389 uint ## B ## _t memsz = EGET(text->sh_size); \
390 Elf ## B ## _Rel *rel; \
391 Elf ## B ## _Rela *rela; \
392 /* search the section headers for relocations */ \
393 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
394 uint32_t sh_type = EGET(shdr[s].sh_type); \
395 if (sh_type == SHT_REL) { \
396 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
397 rela = NULL; \
398 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
399 } else if (sh_type == SHT_RELA) { \
400 rel = NULL; \
401 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
402 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
403 } else \
404 continue; \
405 /* now see if any of the relocs are in the .text */ \
406 for (r = 0; r < rmax; ++r) { \
407 unsigned long sym_max; \
408 Elf ## B ## _Addr offset_tmp; \
409 Elf ## B ## _Sym *func; \
410 Elf ## B ## _Sym *sym; \
411 Elf ## B ## _Addr r_offset; \
412 uint ## B ## _t r_info; \
413 if (sh_type == SHT_REL) { \
414 r_offset = EGET(rel[r].r_offset); \
415 r_info = EGET(rel[r].r_info); \
416 } else { \
417 r_offset = EGET(rela[r].r_offset); \
418 r_info = EGET(rela[r].r_info); \
419 } \
420 /* make sure this relocation is inside of the .text */ \
421 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
422 if (be_verbose <= 2) continue; \
423 } else \
424 *found_textrels = 1; \
425 /* locate this relocation symbol name */ \
426 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
427 if ((void*)sym > elf->data_end) { \
428 warn("%s: corrupt ELF symbol", elf->filename); \
429 continue; \
430 } \
431 sym_max = ELF ## B ## _R_SYM(r_info); \
432 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
433 sym += sym_max; \
434 else \
435 sym = NULL; \
436 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
437 /* show the raw details about this reloc */ \
438 printf(" %s: ", elf->base_filename); \
439 if (sym && sym->st_name) \
440 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
441 else \
442 printf("(memory/data?)"); \
443 printf(" [0x%lX]", (unsigned long)r_offset); \
444 /* now try to find the closest symbol that this rel is probably in */ \
445 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
446 func = NULL; \
447 offset_tmp = 0; \
448 while (sym_max--) { \
449 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
450 func = sym; \
451 offset_tmp = EGET(sym->st_value); \
452 } \
453 ++sym; \
454 } \
455 printf(" in "); \
456 if (func && func->st_name) { \
457 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
458 if (r_offset > EGET(func->st_size)) \
459 printf("(optimized out: previous %s)", func_name); \
460 else \
461 printf("%s", func_name); \
462 } else \
463 printf("(optimized out)"); \
464 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
465 if (be_verbose && has_objdump) { \
466 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
467 char *sysbuf; \
468 size_t syslen; \
469 int sysret; \
470 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
471 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
472 sysbuf = xmalloc(syslen); \
473 if (end_addr < r_offset) \
474 /* not uncommon when things are optimized out */ \
475 end_addr = r_offset + 0x100; \
476 snprintf(sysbuf, syslen, sysfmt, \
477 (unsigned long)offset_tmp, \
478 (unsigned long)end_addr, \
479 elf->filename, \
480 (unsigned long)r_offset); \
481 fflush(stdout); \
482 sysret = system(sysbuf); \
483 fflush(stdout); \
484 free(sysbuf); \
485 } \
486 } \
487 } }
488 SHOW_TEXTRELS(32)
489 SHOW_TEXTRELS(64)
490 }
491 if (!*found_textrels)
492 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
493
494 return NULL;
495}
496
497static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
498{
499 struct stat st;
500 switch (*item) {
501 case '/': break;
502 case '.':
503 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
504 break;
505 case ':':
506 case '\0':
507 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
508 break;
509 case '$':
510 if (fstat(elf->fd, &st) != -1)
511 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
512 warnf("Security problem with %s='%s' in %s with mode set of %o",
513 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
514 break;
515 default:
516 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
517 break;
518 }
519}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 520static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 521{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 522 unsigned long i;
173 char *rpath, *runpath; 523 char *rpath, *runpath, **r;
174 void *strtbl_void; 524 void *strtbl_void;
175 525
176 if (!show_rpath) return; 526 if (!show_rpath) return;
177 527
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 528 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 534 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 535 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 536 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 537 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 538 Elf ## B ## _Off offset; \
539 Elf ## B ## _Xword word; \
540 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 541 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
542 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 543 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
191 offset = EGET(phdr[i].p_offset); \ 544 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 545 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
546 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 547 dyn = DYN ## B (elf->vdata + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 548 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 549 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 550 r = &rpath; \
551 } else if (word == DT_RUNPATH) { \
552 r = &runpath; \
553 } else { \
554 ++dyn; \
555 continue; \
556 } \
557 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 558 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 559 if (offset < (Elf ## B ## _Off)elf->len) { \
560 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 561 *r = elf->data + offset; \
562 /* cache the length in case we need to nuke this section later on */ \
563 if (fix_elf) \
564 offset = strlen(*r); \
565 /* If quiet, don't output paths in ld.so.conf */ \
566 if (be_quiet) { \
567 size_t len; \
568 char *start, *end; \
569 /* note that we only 'chop' off leading known paths. */ \
570 /* since *r is read-only memory, we can only move the ptr forward. */ \
571 start = *r; \
572 /* scan each path in : delimited list */ \
573 while (start) { \
574 rpath_security_checks(elf, start, get_elfdtype(word)); \
575 end = strchr(start, ':'); \
576 len = (end ? abs(end - start) : strlen(start)); \
577 if (use_ldcache) { \
578 size_t n; \
579 const char *ldpath; \
580 array_for_each(ldpaths, n, ldpath) \
581 if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
582 *r = end; \
583 /* corner case ... if RPATH reads "/usr/lib:", we want \
584 * to show ':' rather than '' */ \
585 if (end && end[1] != '\0') \
586 (*r)++; \
587 break; \
588 } \
589 } \
590 if (!*r || !end) \
591 break; \
592 else \
593 start = start + len + 1; \
594 } \
595 } \
596 if (*r) { \
597 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
598 /* just nuke it */ \
599 nuke_it##B: \
600 memset(*r, 0x00, offset); \
601 *r = NULL; \
602 ESET(dyn->d_tag, DT_DEBUG); \
603 ESET(dyn->d_un.d_ptr, 0); \
604 } else if (fix_elf) { \
605 /* try to clean "bad" paths */ \
606 size_t len, tmpdir_len; \
607 char *start, *end; \
608 const char *tmpdir; \
609 start = *r; \
610 tmpdir = (getenv("TMPDIR") ? : "."); \
611 tmpdir_len = strlen(tmpdir); \
612 while (1) { \
613 end = strchr(start, ':'); \
614 if (start == end) { \
615 eat_this_path##B: \
616 len = strlen(end); \
617 memmove(start, end+1, len); \
618 start[len-1] = '\0'; \
619 end = start - 1; \
620 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
621 if (!end) { \
622 if (start == *r) \
623 goto nuke_it##B; \
624 *--start = '\0'; \
625 } else \
626 goto eat_this_path##B; \
627 } \
628 if (!end) \
629 break; \
630 start = end + 1; \
631 } \
632 if (**r == '\0') \
633 goto nuke_it##B; \
634 } \
635 if (*r) \
200 *found_rpath = 1; \ 636 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 637 } \
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 } \ 638 } \
208 ++dyn; \ 639 ++dyn; \
209 } \ 640 } \
210 } } 641 } }
211 SHOW_RPATH(32) 642 SHOW_RPATH(32)
212 SHOW_RPATH(64) 643 SHOW_RPATH(64)
213 } 644 }
645
646 if (be_wewy_wewy_quiet) return;
214 647
215 if (rpath && runpath) { 648 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 649 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 650 xstrcat(ret, runpath, ret_len);
218 } else { 651 } else {
226 } else if (rpath || runpath) 659 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 660 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 661 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 662 xstrcat(ret, " - ", ret_len);
230} 663}
664
665#define LDSO_CACHE_MAGIC "ld.so-"
666#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
667#define LDSO_CACHE_VER "1.7.0"
668#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
669#define FLAG_ANY -1
670#define FLAG_TYPE_MASK 0x00ff
671#define FLAG_LIBC4 0x0000
672#define FLAG_ELF 0x0001
673#define FLAG_ELF_LIBC5 0x0002
674#define FLAG_ELF_LIBC6 0x0003
675#define FLAG_REQUIRED_MASK 0xff00
676#define FLAG_SPARC_LIB64 0x0100
677#define FLAG_IA64_LIB64 0x0200
678#define FLAG_X8664_LIB64 0x0300
679#define FLAG_S390_LIB64 0x0400
680#define FLAG_POWERPC_LIB64 0x0500
681#define FLAG_MIPS64_LIBN32 0x0600
682#define FLAG_MIPS64_LIBN64 0x0700
683
684#if defined(__GLIBC__) || defined(__UCLIBC__)
685
686static char *lookup_cache_lib(elfobj *elf, char *fname)
687{
688 int fd;
689 char *strs;
690 static char buf[__PAX_UTILS_PATH_MAX] = "";
691 const char cachefile[] = "/etc/ld.so.cache";
692 struct stat st;
693
694 typedef struct {
695 char magic[LDSO_CACHE_MAGIC_LEN];
696 char version[LDSO_CACHE_VER_LEN];
697 int nlibs;
698 } header_t;
699 header_t *header;
700
701 typedef struct {
702 int flags;
703 int sooffset;
704 int liboffset;
705 } libentry_t;
706 libentry_t *libent;
707
708 if (fname == NULL)
709 return NULL;
710
711 if (ldcache == NULL) {
712 if (stat(cachefile, &st))
713 return NULL;
714
715 fd = open(cachefile, O_RDONLY);
716 if (fd == -1)
717 return NULL;
718
719 /* cache these values so we only map/unmap the cache file once */
720 ldcache_size = st.st_size;
721 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
722 close(fd);
723
724 if (ldcache == MAP_FAILED) {
725 ldcache = NULL;
726 return NULL;
727 }
728
729 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
730 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
731 {
732 munmap(ldcache, ldcache_size);
733 ldcache = NULL;
734 return NULL;
735 }
736 } else
737 header = ldcache;
738
739 libent = ldcache + sizeof(header_t);
740 strs = (char *) &libent[header->nlibs];
741
742 for (fd = 0; fd < header->nlibs; ++fd) {
743 /* This should be more fine grained, but for now we assume that
744 * diff arches will not be cached together, and we ignore the
745 * the different multilib mips cases.
746 */
747 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
748 continue;
749 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
750 continue;
751
752 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
753 continue;
754
755 /* Return first hit because that is how the ldso rolls */
756 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
757 break;
758 }
759
760 return buf;
761}
762
763#elif defined(__NetBSD__)
764static char *lookup_cache_lib(elfobj *elf, char *fname)
765{
766 static char buf[__PAX_UTILS_PATH_MAX] = "";
767 static struct stat st;
768 size_t n;
769 char *ldpath;
770
771 array_for_each(ldpath, n, ldpath) {
772 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
773 continue; /* if the pathname is too long, or something went wrong, ignore */
774
775 if (stat(buf, &st) != 0)
776 continue; /* if the lib doesn't exist in *ldpath, look further */
777
778 /* NetBSD doesn't actually do sanity checks, it just loads the file
779 * and if that doesn't work, continues looking in other directories.
780 * This cannot easily be safely emulated, unfortunately. For now,
781 * just assume that if it exists, it's a valid library. */
782
783 return buf;
784 }
785
786 /* not found in any path */
787 return NULL;
788}
789#else
790#ifdef __ELF__
791#warning Cache support not implemented for your target
792#endif
793static char *lookup_cache_lib(elfobj *elf, char *fname)
794{
795 return NULL;
796}
797#endif
798
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 799static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 800{
233 unsigned long i; 801 unsigned long i;
234 char *needed; 802 char *needed;
235 void *strtbl_void; 803 void *strtbl_void;
804 char *p;
236 805
237 if (!show_needed) return; 806 /*
807 * -n -> op==0 -> print all
808 * -N -> op==1 -> print requested
809 */
810 if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
811 return NULL;
238 812
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 813 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 814
241 if (elf->phdr && strtbl_void) { 815 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 816#define SHOW_NEEDED(B) \
244 Elf ## B ## _Dyn *dyn; \ 818 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 819 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 820 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 821 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
248 Elf ## B ## _Off offset; \ 822 Elf ## B ## _Off offset; \
823 size_t matched = 0; \
824 /* Walk all the program headers to find the PT_DYNAMIC */ \
249 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 825 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
250 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 826 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
827 continue; \
251 offset = EGET(phdr[i].p_offset); \ 828 offset = EGET(phdr[i].p_offset); \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 829 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
830 continue; \
831 /* Walk all the dynamic tags to find NEEDED entries */ \
253 dyn = DYN ## B (elf->data + offset); \ 832 dyn = DYN ## B (elf->vdata + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 833 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 834 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 835 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 836 if (offset >= (Elf ## B ## _Off)elf->len) { \
837 ++dyn; \
838 continue; \
839 } \
258 needed = (char*)(elf->data + offset); \ 840 needed = elf->data + offset; \
841 if (op == 0) { \
842 /* -n -> print all entries */ \
843 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 844 if (*found_needed) xchrcat(ret, ',', ret_len); \
845 if (use_ldcache) \
846 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
847 needed = p; \
260 xstrcat(ret, needed, ret_len); \ 848 xstrcat(ret, needed, ret_len); \
849 } \
261 *found_needed = 1; \ 850 *found_needed = 1; \
851 } else { \
852 /* -N -> print matching entries */ \
853 size_t n; \
854 const char *find_lib_name; \
855 \
856 array_for_each(find_lib_arr, n, find_lib_name) \
857 if (!strcmp(find_lib_name, needed)) \
858 ++matched; \
859 \
860 if (matched == array_cnt(find_lib_arr)) { \
861 *found_lib = 1; \
862 return (be_wewy_wewy_quiet ? NULL : find_lib); \
863 } \
864 } \
262 } \ 865 } \
263 ++dyn; \ 866 ++dyn; \
264 } \ 867 } \
265 } } 868 } }
266 SHOW_NEEDED(32) 869 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 870 SHOW_NEEDED(64)
871 if (op == 0 && !*found_needed && be_verbose)
872 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 873 }
874
875 return NULL;
269} 876}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 877static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 878{
272 void *strtbl_void; 879 void *strtbl_void;
273 880
278 if (strtbl_void) { 885 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 886#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 887 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 888 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 889 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 890 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 891 }
285 SHOW_INTERP(32) 892 SHOW_INTERP(32)
286 SHOW_INTERP(64) 893 SHOW_INTERP(64)
287 } 894 }
288 return NULL; 895 return NULL;
289} 896}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 897static char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 898{
292 unsigned long i; 899 unsigned long i;
900 struct stat s;
901 char dynamic = 0;
902
903 if (!show_bind) return NULL;
904 if (!elf->phdr) return NULL;
905
906#define SHOW_BIND(B) \
907 if (elf->elf_class == ELFCLASS ## B) { \
908 Elf ## B ## _Dyn *dyn; \
909 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
910 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
911 Elf ## B ## _Off offset; \
912 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
913 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
914 dynamic = 1; \
915 offset = EGET(phdr[i].p_offset); \
916 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
917 dyn = DYN ## B (elf->vdata + offset); \
918 while (EGET(dyn->d_tag) != DT_NULL) { \
919 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
920 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
921 { \
922 if (be_quiet) return NULL; \
923 *found_bind = 1; \
924 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
925 } \
926 ++dyn; \
927 } \
928 } \
929 }
930 SHOW_BIND(32)
931 SHOW_BIND(64)
932
933 if (be_wewy_wewy_quiet) return NULL;
934
935 /* don't output anything if quiet mode and the ELF is static or not setuid */
936 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
937 return NULL;
938 } else {
939 *found_bind = 1;
940 return (char *)(dynamic ? "LAZY" : "STATIC");
941 }
942}
943static char *scanelf_file_soname(elfobj *elf, char *found_soname)
944{
945 unsigned long i;
946 char *soname;
947 void *strtbl_void;
948
949 if (!show_soname) return NULL;
950
951 strtbl_void = elf_findsecbyname(elf, ".dynstr");
952
953 if (elf->phdr && strtbl_void) {
954#define SHOW_SONAME(B) \
955 if (elf->elf_class == ELFCLASS ## B) { \
956 Elf ## B ## _Dyn *dyn; \
957 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
958 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
959 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
960 Elf ## B ## _Off offset; \
961 /* only look for soname in shared objects */ \
962 if (EGET(ehdr->e_type) != ET_DYN) \
963 return NULL; \
964 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
965 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
966 offset = EGET(phdr[i].p_offset); \
967 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
968 dyn = DYN ## B (elf->vdata + offset); \
969 while (EGET(dyn->d_tag) != DT_NULL) { \
970 if (EGET(dyn->d_tag) == DT_SONAME) { \
971 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
972 if (offset >= (Elf ## B ## _Off)elf->len) { \
973 ++dyn; \
974 continue; \
975 } \
976 soname = elf->data + offset; \
977 *found_soname = 1; \
978 return (be_wewy_wewy_quiet ? NULL : soname); \
979 } \
980 ++dyn; \
981 } \
982 } }
983 SHOW_SONAME(32)
984 SHOW_SONAME(64)
985 }
986
987 return NULL;
988}
989
990/*
991 * We support the symbol form:
992 * [%[modifiers]%][[+-]<symbol name>][,[.....]]
993 * If the symbol name is empty, then all symbols are matched.
994 * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
995 * Do not rely on this output format at all.
996 * Otherwise the symbol name is used to search (either regex or string compare).
997 * If the first char of the symbol name is a plus ("+"), then only match
998 * defined symbols. If it's a minus ("-"), only match undefined symbols.
999 * Putting modifiers in between the percent signs allows for more in depth
1000 * filters. There are groups of modifiers. If you don't specify a member
1001 * of a group, then all types in that group are matched. The current
1002 * groups and their types are:
1003 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f SST_FILE:F
1004 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1005 * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1006 * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1007 * You can search for multiple symbols at once by seperating with a comma (",").
1008 *
1009 * Some examples:
1010 * ELFs with a weak function "foo":
1011 * scanelf -s %wf%foo <ELFs>
1012 * ELFs that define the symbol "main":
1013 * scanelf -s +main <ELFs>
1014 * scanelf -s %d%main <ELFs>
1015 * ELFs that refer to the undefined symbol "brk":
1016 * scanelf -s -brk <ELFs>
1017 * scanelf -s %u%brk <ELFs>
1018 * All global defined objects in an ELF:
1019 * scanelf -s %ogd% <ELF>
1020 */
1021static void
1022scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1023 unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1024{
1025 char *this_sym, *next_sym, saved = saved;
1026
1027 /* allow the user to specify a comma delimited list of symbols to search for */
1028 next_sym = NULL;
1029 do {
1030 bool inc_notype, inc_object, inc_func, inc_file,
1031 inc_local, inc_global, inc_weak,
1032 inc_def, inc_undef, inc_abs, inc_common;
1033
1034 if (next_sym) {
1035 next_sym[-1] = saved;
1036 this_sym = next_sym;
1037 } else
1038 this_sym = find_sym;
1039 if ((next_sym = strchr(this_sym, ','))) {
1040 /* make parsing easier by killing the comma temporarily */
1041 saved = *next_sym;
1042 *next_sym = '\0';
1043 next_sym += 1;
1044 }
1045
1046 /* symbol selection! */
1047 inc_notype = inc_object = inc_func = inc_file = \
1048 inc_local = inc_global = inc_weak = \
1049 inc_def = inc_undef = inc_abs = inc_common = \
1050 (*this_sym != '%');
1051
1052 /* parse the contents of %...% */
1053 if (!inc_notype) {
1054 while (*(this_sym++)) {
1055 if (*this_sym == '%') {
1056 ++this_sym;
1057 break;
1058 }
1059 switch (*this_sym) {
1060 case 'n': inc_notype = true; break;
1061 case 'o': inc_object = true; break;
1062 case 'f': inc_func = true; break;
1063 case 'F': inc_file = true; break;
1064 case 'l': inc_local = true; break;
1065 case 'g': inc_global = true; break;
1066 case 'w': inc_weak = true; break;
1067 case 'd': inc_def = true; break;
1068 case 'u': inc_undef = true; break;
1069 case 'a': inc_abs = true; break;
1070 case 'c': inc_common = true; break;
1071 default: err("invalid symbol selector '%c'", *this_sym);
1072 }
1073 }
1074
1075 /* If no types are matched, not match all */
1076 if (!inc_notype && !inc_object && !inc_func && !inc_file)
1077 inc_notype = inc_object = inc_func = inc_file = true;
1078 if (!inc_local && !inc_global && !inc_weak)
1079 inc_local = inc_global = inc_weak = true;
1080 if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1081 inc_def = inc_undef = inc_abs = inc_common = true;
1082
1083 /* backwards compat for defined/undefined short hand */
1084 } else if (*this_sym == '+') {
1085 inc_undef = false;
1086 ++this_sym;
1087 } else if (*this_sym == '-') {
1088 inc_def = inc_abs = inc_common = false;
1089 ++this_sym;
1090 }
1091
1092 /* filter symbols */
1093 if ((!inc_notype && stt == STT_NOTYPE) || \
1094 (!inc_object && stt == STT_OBJECT) || \
1095 (!inc_func && stt == STT_FUNC ) || \
1096 (!inc_file && stt == STT_FILE ) || \
1097 (!inc_local && stb == STB_LOCAL ) || \
1098 (!inc_global && stb == STB_GLOBAL) || \
1099 (!inc_weak && stb == STB_WEAK ) || \
1100 (!inc_def && shn && shn < SHN_LORESERVE) || \
1101 (!inc_undef && shn == SHN_UNDEF ) || \
1102 (!inc_abs && shn == SHN_ABS ) || \
1103 (!inc_common && shn == SHN_COMMON))
1104 continue;
1105
1106 if (*this_sym == '*') {
1107 /* a "*" symbol gets you debug output */
1108 printf("%s(%s) %5lX %15s %15s %15s %s\n",
1109 ((*found_sym == 0) ? "\n\t" : "\t"),
1110 elf->base_filename,
1111 size,
1112 get_elfstttype(stt),
1113 get_elfstbtype(stb),
1114 get_elfshntype(shn),
1115 symname);
1116 goto matched;
1117
1118 } else {
1119 if (g_match) {
1120 /* regex match the symbol */
1121 if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1122 continue;
1123
1124 } else if (*this_sym) {
1125 /* give empty symbols a "pass", else do a normal compare */
1126 const size_t len = strlen(this_sym);
1127 if (!(strncmp(this_sym, symname, len) == 0 &&
1128 /* Accept unversioned symbol names */
1129 (symname[len] == '\0' || symname[len] == '@')))
1130 continue;
1131 }
1132
1133 if (be_semi_verbose) {
1134 char buf[1024];
1135 snprintf(buf, sizeof(buf), "%lX %s %s",
1136 size,
1137 get_elfstttype(stt),
1138 this_sym);
1139 *ret = xstrdup(buf);
1140 } else {
1141 if (*ret) xchrcat(ret, ',', ret_len);
1142 xstrcat(ret, symname, ret_len);
1143 }
1144
1145 goto matched;
1146 }
1147 } while (next_sym);
1148
1149 return;
1150
1151 matched:
1152 *found_sym = 1;
1153 if (next_sym)
1154 next_sym[-1] = saved;
1155}
1156
1157static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1158{
1159 unsigned long i;
1160 char *ret;
293 void *symtab_void, *strtab_void; 1161 void *symtab_void, *strtab_void;
294 1162
295 if (!find_sym) return NULL; 1163 if (!find_sym) return NULL;
1164 ret = NULL;
296 1165
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 1166 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 1167
300 if (symtab_void && strtab_void) { 1168 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 1169#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 1170 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1171 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1172 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1173 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1174 unsigned long cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 1175 char *symname; \
1176 size_t ret_len = 0; \
1177 if (cnt) \
1178 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 1179 for (i = 0; i < cnt; ++i) { \
1180 if ((void*)sym > elf->data_end) { \
1181 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1182 goto break_out; \
1183 } \
309 if (sym->st_name) { \ 1184 if (sym->st_name) { \
1185 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1186 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
311 if (*find_sym == '*') { \ 1187 if ((void*)symname > elf->data_end) { \
312 printf("%s(%s) %5lX %15s %s\n", \ 1188 warnf("%s: corrupt ELF symbols", elf->filename); \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1189 ++sym; \
314 (char *)basename(filename), \ 1190 continue; \
315 (long)sym->st_size, \ 1191 } \
316 (char *)get_elfstttype(sym->st_info), \ 1192 scanelf_match_symname(elf, found_sym, \
317 symname); \ 1193 &ret, &ret_len, symname, \
318 *found_sym = 1; \ 1194 ELF##B##_ST_TYPE(EGET(sym->st_info)), \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 1195 ELF##B##_ST_BIND(EGET(sym->st_info)), \
320 (strcmp(symname, versioned_symname) == 0)) \ 1196 EGET(sym->st_shndx), \
321 (*found_sym)++; \ 1197 /* st_size can be 64bit, but no one is really that big, so screw em */ \
1198 EGET(sym->st_size)); \
322 } \ 1199 } \
323 ++sym; \ 1200 ++sym; \
324 } } 1201 } }
325 FIND_SYM(32) 1202 FIND_SYM(32)
326 FIND_SYM(64) 1203 FIND_SYM(64)
327 } 1204 }
1205
1206break_out:
1207 if (be_wewy_wewy_quiet) return NULL;
1208
328 if (*find_sym != '*' && *found_sym) 1209 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1210 return ret;
330 if (be_quiet) 1211 if (be_quiet)
331 return NULL; 1212 return NULL;
332 else 1213 else
333 return " - "; 1214 return " - ";
334} 1215}
1216
1217static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1218{
1219 if (!find_section)
1220 return NULL;
1221
1222#define FIND_SECTION(B) \
1223 if (elf->elf_class == ELFCLASS ## B) { \
1224 size_t matched, n; \
1225 int invert; \
1226 const char *section_name; \
1227 Elf ## B ## _Shdr *section; \
1228 \
1229 matched = 0; \
1230 array_for_each(find_section_arr, n, section_name) { \
1231 invert = (*section_name == '!' ? 1 : 0); \
1232 section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1233 if ((section == NULL && invert) || (section != NULL && !invert)) \
1234 ++matched; \
1235 } \
1236 \
1237 if (matched == array_cnt(find_section_arr)) \
1238 *found_section = 1; \
1239 }
1240 FIND_SECTION(32)
1241 FIND_SECTION(64)
1242
1243 if (be_wewy_wewy_quiet)
1244 return NULL;
1245
1246 if (*found_section)
1247 return find_section;
1248
1249 if (be_quiet)
1250 return NULL;
1251 else
1252 return " - ";
1253}
1254
335/* scan an elf file and show all the fun stuff */ 1255/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1256#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
337static void scanelf_file(const char *filename) 1257static int scanelf_elfobj(elfobj *elf)
338{ 1258{
339 unsigned long i; 1259 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1260 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1261 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1262 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1263 static char *out_buffer = NULL;
346 static size_t out_len; 1264 static size_t out_len;
347 1265
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 = \ 1266 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1267 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1268 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1269
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) 1270 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1271 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1272 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1273 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1274 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1275 printf("%s: scanning file\n", elf->filename);
375 1276
376 /* init output buffer */ 1277 /* init output buffer */
377 if (!out_buffer) { 1278 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1279 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1280 out_buffer = xmalloc(out_len);
380 } 1281 }
381 *out_buffer = '\0'; 1282 *out_buffer = '\0';
382 1283
383 /* show the header */ 1284 /* show the header */
384 if (!be_quiet && show_banner) { 1285 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1286 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1287 if (!IS_MODIFIER(out_format[i])) continue;
387 1288
388 switch (out_format[++i]) { 1289 switch (out_format[++i]) {
1290 case '+': break;
389 case '%': break; 1291 case '%': break;
1292 case '#': break;
1293 case 'F':
1294 case 'p':
390 case 'F': prints("FILE "); break; 1295 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1296 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1297 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1298 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1299 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1300 case 'r': prints("RPATH "); break;
1301 case 'M': prints("CLASS "); break;
396 case 'n': prints("NEEDED "); break; 1302 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1303 case 'i': prints("INTERP "); break;
1304 case 'b': prints("BIND "); break;
1305 case 'Z': prints("SIZE "); break;
1306 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1307 case 's': prints("SYM "); break;
1308 case 'N': prints("LIB "); break;
1309 case 'T': prints("TEXTRELS "); break;
1310 case 'k': prints("SECTION "); break;
1311 case 'a': prints("ARCH "); break;
1312 case 'I': prints("OSABI "); break;
1313 case 'Y': prints("EABI "); break;
1314 case 'O': prints("PERM "); break;
1315 case 'D': prints("ENDIAN "); break;
1316 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1317 }
400 } 1318 }
1319 if (!found_file) prints("FILE ");
401 prints("\n"); 1320 prints("\n");
1321 found_file = 0;
402 show_banner = 0; 1322 show_banner = 0;
403 } 1323 }
404 1324
405 /* dump all the good stuff */ 1325 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1326 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1327 const char *out;
408 1328 const char *tmp;
409 /* make sure we trim leading spaces in quiet mode */ 1329 static char ubuf[sizeof(unsigned long)*2];
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 1330 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); 1331 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1332 continue;
416 } 1333 }
417 1334
418 out = NULL; 1335 out = NULL;
1336 be_wewy_wewy_quiet = (out_format[i] == '#');
1337 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1338 switch (out_format[++i]) {
1339 case '+':
1340 case '%':
1341 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1342 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1343 case 'F':
1344 found_file = 1;
1345 if (be_wewy_wewy_quiet) break;
1346 xstrcat(&out_buffer, elf->filename, &out_len);
1347 break;
1348 case 'p':
1349 found_file = 1;
1350 if (be_wewy_wewy_quiet) break;
1351 tmp = elf->filename;
1352 if (search_path) {
1353 ssize_t len_search = strlen(search_path);
1354 ssize_t len_file = strlen(elf->filename);
1355 if (!strncmp(elf->filename, search_path, len_search) && \
1356 len_file > len_search)
1357 tmp += len_search;
1358 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1359 }
1360 xstrcat(&out_buffer, tmp, &out_len);
1361 break;
1362 case 'f':
1363 found_file = 1;
1364 if (be_wewy_wewy_quiet) break;
1365 tmp = strrchr(elf->filename, '/');
1366 tmp = (tmp == NULL ? elf->filename : tmp+1);
1367 xstrcat(&out_buffer, tmp, &out_len);
1368 break;
422 case 'o': out = get_elfetype(elf); break; 1369 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1370 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1371 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; 1372 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1373 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; 1374 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1375 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1376 case 'D': out = get_endian(elf); break;
1377 case 'O': out = strfileperms(elf->filename); break;
1378 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1379 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
428 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1380 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1381 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1382 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1383 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1384 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1385 case 'a': out = get_elfemtype(elf); break;
1386 case 'I': out = get_elfosabi(elf); break;
1387 case 'Y': out = get_elf_eabi(elf); break;
1388 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1389 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1390 }
1391 if (out)
431 if (out) xstrcat(&out_buffer, out, &out_len); 1392 xstrcat(&out_buffer, out, &out_len);
432 } 1393 }
433 1394
434 if (!found_file) { 1395#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1396 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1397 found_rpath || found_needed || found_interp || found_bind || \
1398 found_soname || found_sym || found_lib || found_textrels || found_section )
1399
1400 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1401 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1402 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1403 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1404 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1405 puts(out_buffer);
1406 fflush(stdout);
1407 }
441 1408
1409 return 0;
1410}
1411
1412/* scan a single elf */
1413static int scanelf_elf(const char *filename, int fd, size_t len)
1414{
1415 int ret = 1;
1416 elfobj *elf;
1417
1418 /* verify this is real ELF */
1419 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1420 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1421 return ret;
1422 }
1423 switch (match_bits) {
1424 case 32:
1425 if (elf->elf_class != ELFCLASS32)
1426 goto label_done;
1427 break;
1428 case 64:
1429 if (elf->elf_class != ELFCLASS64)
1430 goto label_done;
1431 break;
1432 default: break;
1433 }
1434 if (match_etypes) {
1435 char sbuf[126];
1436 strncpy(sbuf, match_etypes, sizeof(sbuf));
1437 if (strchr(match_etypes, ',') != NULL) {
1438 char *p;
1439 while ((p = strrchr(sbuf, ',')) != NULL) {
1440 *p = 0;
1441 if (etype_lookup(p+1) == get_etype(elf))
1442 goto label_ret;
1443 }
1444 }
1445 if (etype_lookup(sbuf) != get_etype(elf))
1446 goto label_done;
1447 }
1448
1449label_ret:
1450 ret = scanelf_elfobj(elf);
1451
1452label_done:
442 unreadelf(elf); 1453 unreadelf(elf);
1454 return ret;
1455}
1456
1457/* scan an archive of elfs */
1458static int scanelf_archive(const char *filename, int fd, size_t len)
1459{
1460 archive_handle *ar;
1461 archive_member *m;
1462 char *ar_buffer;
1463 elfobj *elf;
1464
1465 ar = ar_open_fd(filename, fd);
1466 if (ar == NULL)
1467 return 1;
1468
1469 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1470 while ((m = ar_next(ar)) != NULL) {
1471 off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1472 if (cur_pos == -1)
1473 errp("lseek() failed");
1474 elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1475 if (elf) {
1476 scanelf_elfobj(elf);
1477 unreadelf(elf);
1478 }
1479 }
1480 munmap(ar_buffer, len);
1481
1482 return 0;
1483}
1484/* scan a file which may be an elf or an archive or some other magical beast */
1485static int scanelf_file(const char *filename, const struct stat *st_cache)
1486{
1487 const struct stat *st = st_cache;
1488 struct stat symlink_st;
1489 int fd;
1490
1491 /* always handle regular files and handle symlinked files if no -y */
1492 if (S_ISLNK(st->st_mode)) {
1493 if (!scan_symlink) return 1;
1494 stat(filename, &symlink_st);
1495 st = &symlink_st;
1496 }
1497
1498 if (!S_ISREG(st->st_mode)) {
1499 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1500 return 1;
1501 }
1502
1503 if (match_perms) {
1504 if ((st->st_mode | match_perms) != st->st_mode)
1505 return 1;
1506 }
1507 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1508 return 1;
1509
1510 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1511 /* if it isn't an ELF, maybe it's an .a archive */
1512 scanelf_archive(filename, fd, st->st_size);
1513
1514 close(fd);
1515 return 0;
1516}
1517
1518static const char *maybe_add_root(const char *fname, char *buf)
1519{
1520 if (root && strncmp(fname, root, strlen(root))) {
1521 strcpy(buf, root);
1522 strncat(buf, fname, __PAX_UTILS_PATH_MAX - strlen(root) - 1);
1523 fname = buf;
1524 }
1525 return fname;
443} 1526}
444 1527
445/* scan a directory for ET_EXEC files and print when we find one */ 1528/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1529static int scanelf_dir(const char *path)
447{ 1530{
448 register DIR *dir; 1531 register DIR *dir;
449 register struct dirent *dentry; 1532 register struct dirent *dentry;
450 struct stat st_top, st; 1533 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1534 char buf[__PAX_UTILS_PATH_MAX];
1535 char _path[__PAX_UTILS_PATH_MAX];
452 size_t pathlen = 0, len = 0; 1536 size_t pathlen = 0, len = 0;
1537 int ret = 0;
1538
1539 path = maybe_add_root(path, _path);
453 1540
454 /* make sure path exists */ 1541 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1542 if (lstat(path, &st_top) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1543 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1544 return 1;
458 } 1545 }
459 1546
460 /* ok, if it isn't a directory, assume we can open it */ 1547 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1548 if (!S_ISDIR(st_top.st_mode)) {
462 scanelf_file(path); 1549 return scanelf_file(path, &st_top);
463 return;
464 } 1550 }
465 1551
466 /* now scan the dir looking for fun stuff */ 1552 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1553 if ((dir = opendir(path)) == NULL) {
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1554 warnf("could not opendir %s: %s", path, strerror(errno));
469 return; 1555 return 1;
470 } 1556 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1557 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1558
473 pathlen = strlen(path); 1559 pathlen = strlen(path);
474 while ((dentry = readdir(dir))) { 1560 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1561 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1562 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1563 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
478 if (len >= sizeof(buf)) { 1564 if (len >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1565 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1566 (unsigned long)len, (unsigned long)sizeof(buf));
480 continue; 1567 continue;
481 } 1568 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1569 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
483 if (lstat(buf, &st) != -1) { 1570 if (lstat(buf, &st) != -1) {
484 if (S_ISREG(st.st_mode)) 1571 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1572 ret = scanelf_file(buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1573 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1574 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1575 ret = scanelf_dir(buf);
489 } 1576 }
490 } 1577 }
491 } 1578 }
492 closedir(dir); 1579 closedir(dir);
1580 return ret;
493} 1581}
1582
1583static int scanelf_from_file(const char *filename)
1584{
1585 FILE *fp;
1586 char *p, *path;
1587 size_t len;
1588 int ret;
1589
1590 if (strcmp(filename, "-") == 0)
1591 fp = stdin;
1592 else if ((fp = fopen(filename, "r")) == NULL)
1593 return 1;
1594
1595 path = NULL;
1596 len = 0;
1597 ret = 0;
1598 while (getline(&path, &len, fp) != -1) {
1599 if ((p = strchr(path, '\n')) != NULL)
1600 *p = 0;
1601 search_path = path;
1602 ret = scanelf_dir(path);
1603 }
1604 free(path);
1605
1606 if (fp != stdin)
1607 fclose(fp);
1608
1609 return ret;
1610}
1611
1612#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1613
1614static int load_ld_cache_config(int i, const char *fname)
1615{
1616 FILE *fp = NULL;
1617 char *p, *path;
1618 size_t len;
1619 char _fname[__PAX_UTILS_PATH_MAX];
1620
1621 fname = maybe_add_root(fname, _fname);
1622
1623 if ((fp = fopen(fname, "r")) == NULL)
1624 return i;
1625
1626 path = NULL;
1627 len = 0;
1628 while (getline(&path, &len, fp) != -1) {
1629 if ((p = strrchr(path, '\r')) != NULL)
1630 *p = 0;
1631 if ((p = strchr(path, '\n')) != NULL)
1632 *p = 0;
1633
1634 /* recursive includes of the same file will make this segfault. */
1635 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1636 glob_t gl;
1637 size_t x;
1638 char gpath[__PAX_UTILS_PATH_MAX];
1639
1640 memset(gpath, 0, sizeof(gpath));
1641 if (root)
1642 strcpy(gpath, root);
1643
1644 if (path[8] != '/')
1645 snprintf(gpath+strlen(gpath), sizeof(gpath)-strlen(gpath), "/etc/%s", &path[8]);
1646 else
1647 strncpy(gpath+strlen(gpath), &path[8], sizeof(gpath)-strlen(gpath));
1648
1649 if (glob(gpath, 0, NULL, &gl) == 0) {
1650 for (x = 0; x < gl.gl_pathc; ++x) {
1651 /* try to avoid direct loops */
1652 if (strcmp(gl.gl_pathv[x], fname) == 0)
1653 continue;
1654 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1655 }
1656 globfree(&gl);
1657 continue;
1658 }
1659 }
1660
1661 if (*path != '/')
1662 continue;
1663
1664 xarraypush(ldpaths, path, strlen(path));
1665 }
1666 free(path);
1667
1668 fclose(fp);
1669
1670 return i;
1671}
1672
1673#elif defined(__FreeBSD__) || defined(__DragonFly__)
1674
1675static int load_ld_cache_config(int i, const char *fname)
1676{
1677 FILE *fp = NULL;
1678 char *b = NULL, *p;
1679 struct elfhints_hdr hdr;
1680 char _fname[__PAX_UTILS_PATH_MAX];
1681
1682 fname = maybe_add_root(fname, _fname);
1683
1684 if ((fp = fopen(fname, "r")) == NULL)
1685 return i;
1686
1687 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1688 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1689 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1690 {
1691 fclose(fp);
1692 return i;
1693 }
1694
1695 b = xmalloc(hdr.dirlistlen + 1);
1696 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1697 fclose(fp);
1698 free(b);
1699 return i;
1700 }
1701
1702 while ((p = strsep(&b, ":"))) {
1703 if (*p == '\0')
1704 continue;
1705 xarraypush(ldpaths, p, strlen(p));
1706 }
1707
1708 free(b);
1709 fclose(fp);
1710 return i;
1711}
1712
1713#else
1714#ifdef __ELF__
1715#warning Cache config support not implemented for your target
1716#endif
1717static int load_ld_cache_config(int i, const char *fname)
1718{
1719 return 0;
1720}
1721#endif
494 1722
495/* scan /etc/ld.so.conf for paths */ 1723/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1724static void scanelf_ldpath(void)
497{ 1725{
498 char scan_l, scan_ul, scan_ull; 1726 char scan_l, scan_ul, scan_ull;
499 char *path, *p; 1727 size_t n;
500 FILE *fp; 1728 const char *ldpath;
1729 int i = 0;
501 1730
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1731 if (array_cnt(ldpaths) == 0)
503 err("Unable to open ld.so.conf: %s", strerror(errno)); 1732 err("Unable to load any paths from ld.so.conf");
504 1733
505 scan_l = scan_ul = scan_ull = 0; 1734 scan_l = scan_ul = scan_ull = 0;
506 1735
507 path = (char*)xmalloc(_POSIX_PATH_MAX); 1736 array_for_each(ldpaths, n, ldpath) {
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; 1737 if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = 1;
515 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1738 if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = 1;
516 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1739 if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = 1;
517 scanelf_dir(path); 1740 scanelf_dir(ldpath);
1741 ++i;
518 } 1742 }
519 free(path);
520 fclose(fp);
521 1743
522 if (!scan_l) scanelf_dir("/lib"); 1744 if (!scan_l) scanelf_dir("/lib");
523 if (!scan_ul) scanelf_dir("/usr/lib"); 1745 if (!scan_ul) scanelf_dir("/usr/lib");
524 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1746 if (!scan_ull) scanelf_dir("/usr/local/lib");
525} 1747}
526 1748
527/* scan env PATH for paths */ 1749/* scan env PATH for paths */
528static void scanelf_envpath() 1750static void scanelf_envpath(void)
529{ 1751{
530 char *path, *p; 1752 char *path, *p;
531 1753
532 path = getenv("PATH"); 1754 path = getenv("PATH");
533 if (!path) 1755 if (!path)
540 } 1762 }
541 1763
542 free(path); 1764 free(path);
543} 1765}
544 1766
545 1767/* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
546
547/* usage / invocation handling functions */
548#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 1768#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
549#define a_argument required_argument 1769#define a_argument required_argument
550static struct option const long_opts[] = { 1770static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1771 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1772 {"ldpath", no_argument, NULL, 'l'},
1773 {"root", a_argument, NULL, 128},
553 {"recursive", no_argument, NULL, 'R'}, 1774 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1775 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1776 {"symlink", no_argument, NULL, 'y'},
1777 {"archives", no_argument, NULL, 'A'},
1778 {"ldcache", no_argument, NULL, 'L'},
1779 {"fix", no_argument, NULL, 'X'},
1780 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1781 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1782 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1783 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1784 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1785 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1786 {"interp", no_argument, NULL, 'i'},
1787 {"bind", no_argument, NULL, 'b'},
1788 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1789 {"symbol", a_argument, NULL, 's'},
1790 {"section", a_argument, NULL, 'k'},
1791 {"lib", a_argument, NULL, 'N'},
1792 {"gmatch", no_argument, NULL, 'g'},
1793 {"textrels", no_argument, NULL, 'T'},
1794 {"etype", a_argument, NULL, 'E'},
1795 {"bits", a_argument, NULL, 'M'},
1796 {"endian", no_argument, NULL, 'D'},
1797 {"osabi", no_argument, NULL, 'I'},
1798 {"eabi", no_argument, NULL, 'Y'},
1799 {"perms", a_argument, NULL, 'O'},
1800 {"size", no_argument, NULL, 'Z'},
563 {"all", no_argument, NULL, 'a'}, 1801 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1802 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1803 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1804 {"format", a_argument, NULL, 'F'},
1805 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1806 {"file", a_argument, NULL, 'o'},
1807 {"nocolor", no_argument, NULL, 'C'},
568 {"nobanner", no_argument, NULL, 'B'}, 1808 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1809 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1810 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1811 {NULL, no_argument, NULL, 0x0}
572}; 1812};
1813
573static char *opts_help[] = { 1814static const char * const opts_help[] = {
574 "Scan all directories in PATH environment", 1815 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1816 "Scan all directories in /etc/ld.so.conf",
1817 "Root directory (use with -l or -p)",
576 "Scan directories recursively", 1818 "Scan directories recursively",
577 "Don't recursively cross mount points", 1819 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1820 "Don't scan symlinks",
1821 "Scan archives (.a files)",
1822 "Utilize ld.so.cache information (use with -r/-n)",
1823 "Try and 'fix' bad things (use with -r/-e)",
1824 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 1825 "Print PaX markings",
580 "Print GNU_STACK markings", 1826 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 1827 "Print TEXTREL information",
582 "Print RPATH information", 1828 "Print RPATH information",
583 "Print NEEDED information", 1829 "Print NEEDED information",
584 "Print INTERP information", 1830 "Print INTERP information",
1831 "Print BIND information",
1832 "Print SONAME information",
585 "Find a specified symbol", 1833 "Find a specified symbol",
586 "Print all scanned info (-x -e -t -r)\n", 1834 "Find a specified section",
1835 "Find a specified library",
1836 "Use regex matching rather than string compare (use with -s)",
1837 "Locate cause of TEXTREL",
1838 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1839 "Print only ELF files matching numeric bits",
1840 "Print Endianness",
1841 "Print OSABI",
1842 "Print EABI (EM_ARM Only)",
1843 "Print only ELF files matching octal permissions",
1844 "Print ELF file size",
1845 "Print all useful/simple info\n",
587 "Only output 'bad' things", 1846 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 1847 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 1848 "Use specified format for output",
1849 "Read input stream from a filename",
590 "Write output stream to a filename", 1850 "Write output stream to a filename",
1851 "Don't emit color in output",
591 "Don't display the header", 1852 "Don't display the header",
592 "Print this help and exit", 1853 "Print this help and exit",
593 "Print version and exit", 1854 "Print version and exit",
594 NULL 1855 NULL
595}; 1856};
596 1857
597/* display usage and exit */ 1858/* display usage and exit */
598static void usage(int status) 1859static void usage(int status)
599{ 1860{
600 unsigned long i; 1861 unsigned long i;
601 printf(" Scan ELF binaries for stuff\n\n" 1862 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1863 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 1864 printf("Options: -[%s]\n", PARSE_FLAGS);
604 for (i = 0; long_opts[i].name; ++i) 1865 for (i = 0; long_opts[i].name; ++i)
605 if (long_opts[i].has_arg == no_argument) 1866 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1867 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1868 long_opts[i].name, opts_help[i]);
1869 else if (long_opts[i].val > '~')
1870 printf(" --%-7s <arg> * %s\n",
607 long_opts[i].name, opts_help[i]); 1871 long_opts[i].name, opts_help[i]);
608 else 1872 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1873 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
610 long_opts[i].name, opts_help[i]); 1874 long_opts[i].name, opts_help[i]);
1875
1876 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 1877 exit(status);
612} 1878}
613 1879
614/* parse command line arguments and preform needed actions */ 1880/* parse command line arguments and preform needed actions */
1881#define do_pax_state(option, flag) \
1882 if (islower(option)) { \
1883 flags &= ~PF_##flag; \
1884 flags |= PF_NO##flag; \
1885 } else { \
1886 flags &= ~PF_NO##flag; \
1887 flags |= PF_##flag; \
1888 }
615static void parseargs(int argc, char *argv[]) 1889static int parseargs(int argc, char *argv[])
616{ 1890{
617 int flag; 1891 int i;
1892 const char *from_file = NULL;
1893 int ret = 0;
618 1894
619 opterr = 0; 1895 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1896 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 1897 switch (i) {
622 1898
623 case 'V': 1899 case 'V':
624 printf("%s compiled %s\n%s\n" 1900 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1901 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 1902 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 1903 exit(EXIT_SUCCESS);
628 break; 1904 break;
629 case 'h': usage(EXIT_SUCCESS); break; 1905 case 'h': usage(EXIT_SUCCESS); break;
630 1906 case 'f':
1907 if (from_file) warn("You prob don't want to specify -f twice");
1908 from_file = optarg;
1909 break;
1910 case 'E':
1911 match_etypes = optarg;
1912 break;
1913 case 'M':
1914 match_bits = atoi(optarg);
1915 if (match_bits == 0) {
1916 if (strcmp(optarg, "ELFCLASS32") == 0)
1917 match_bits = 32;
1918 if (strcmp(optarg, "ELFCLASS64") == 0)
1919 match_bits = 64;
1920 }
1921 break;
1922 case 'O':
1923 if (sscanf(optarg, "%o", &match_perms) == -1)
1924 match_bits = 0;
1925 break;
631 case 'o': { 1926 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 1927 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL)
635 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1928 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 1929 break;
638 } 1930 }
639 1931 case 'k':
1932 xarraypush(find_section_arr, optarg, strlen(optarg));
1933 break;
640 case 's': { 1934 case 's': {
641 size_t len; 1935 if (find_sym) warn("You prob don't want to specify -s twice");
642 find_sym = xstrdup(optarg); 1936 find_sym = optarg;
643 len = strlen(find_sym) + 1;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
645 sprintf(versioned_symname, "%s@", find_sym);
646 break; 1937 break;
647 } 1938 }
648 1939 case 'N':
1940 xarraypush(find_lib_arr, optarg, strlen(optarg));
1941 break;
649 case 'F': { 1942 case 'F': {
1943 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 1944 out_format = optarg;
651 break; 1945 break;
652 } 1946 }
1947 case 'z': {
1948 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1949 size_t x;
653 1950
1951 for (x = 0; x < strlen(optarg); x++) {
1952 switch (optarg[x]) {
1953 case 'p':
1954 case 'P':
1955 do_pax_state(optarg[x], PAGEEXEC);
1956 break;
1957 case 's':
1958 case 'S':
1959 do_pax_state(optarg[x], SEGMEXEC);
1960 break;
1961 case 'm':
1962 case 'M':
1963 do_pax_state(optarg[x], MPROTECT);
1964 break;
1965 case 'e':
1966 case 'E':
1967 do_pax_state(optarg[x], EMUTRAMP);
1968 break;
1969 case 'r':
1970 case 'R':
1971 do_pax_state(optarg[x], RANDMMAP);
1972 break;
1973 case 'x':
1974 case 'X':
1975 do_pax_state(optarg[x], RANDEXEC);
1976 break;
1977 default:
1978 break;
1979 }
1980 }
1981 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1982 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1983 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1984 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1985 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1986 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1987 setpax = flags;
1988 break;
1989 }
1990 case 'Z': show_size = 1; break;
1991 case 'g': g_match = 1; break;
1992 case 'L': use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 1993 case 'y': scan_symlink = 0; break;
1994 case 'A': scan_archives = 1; break;
1995 case 'C': color_init(true); break;
655 case 'B': show_banner = 0; break; 1996 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 1997 case 'l': scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 1998 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 1999 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 2000 case 'm': dir_crossmount = 0; break;
2001 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 2002 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 2003 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 2004 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 2005 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 2006 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 2007 case 'i': show_interp = 1; break;
2008 case 'b': show_bind = 1; break;
2009 case 'S': show_soname = 1; break;
2010 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 2011 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 2012 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; 2013 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
669 2014 case 'D': show_endian = 1; break;
2015 case 'I': show_osabi = 1; break;
2016 case 'Y': show_eabi = 1; break;
2017 case 128:
2018 root = optarg;
2019 break;
670 case ':': 2020 case ':':
671 warn("Option missing parameter\n"); 2021 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 2022 case '?':
675 warn("Unknown option\n"); 2023 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 2024 default:
679 err("Unhandled option '%c'", flag); 2025 err("Unhandled option '%c'; please report this", i);
680 break;
681 }
682 } 2026 }
683 2027 }
684 if (be_quiet && be_verbose) 2028 if (show_textrels && be_verbose)
685 err("You can be quiet or you can be verbose, not both, stupid"); 2029 has_objdump = bin_in_path("objdump");
686 2030 /* flatten arrays for display */
2031 if (array_cnt(find_lib_arr))
2032 find_lib = array_flatten_str(find_lib_arr);
2033 if (array_cnt(find_section_arr))
2034 find_section = array_flatten_str(find_section_arr);
687 /* let the format option override all other options */ 2035 /* let the format option override all other options */
688 if (out_format) { 2036 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 2037 show_pax = show_phdr = show_textrel = show_rpath = \
2038 show_needed = show_interp = show_bind = show_soname = \
2039 show_textrels = show_perms = show_endian = show_size = \
2040 show_osabi = show_eabi = 0;
690 for (flag=0; out_format[flag]; ++flag) { 2041 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 2042 if (!IS_MODIFIER(out_format[i])) continue;
692 2043
693 switch (out_format[++flag]) { 2044 switch (out_format[++i]) {
2045 case '+': break;
694 case '%': break; 2046 case '%': break;
2047 case '#': break;
695 case 'F': break; 2048 case 'F': break;
2049 case 'p': break;
2050 case 'f': break;
2051 case 'k': break;
696 case 's': break; 2052 case 's': break;
2053 case 'N': break;
697 case 'o': break; 2054 case 'o': break;
2055 case 'a': break;
2056 case 'M': break;
2057 case 'Z': show_size = 1; break;
2058 case 'D': show_endian = 1; break;
2059 case 'I': show_osabi = 1; break;
2060 case 'Y': show_eabi = 1; break;
2061 case 'O': show_perms = 1; break;
698 case 'x': show_pax = 1; break; 2062 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 2063 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 2064 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 2065 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 2066 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 2067 case 'i': show_interp = 1; break;
2068 case 'b': show_bind = 1; break;
2069 case 'S': show_soname = 1; break;
2070 case 'T': show_textrels = 1; break;
704 default: 2071 default:
705 err("Invalid format specifier '%c' (byte %i)", 2072 err("Invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 2073 out_format[i], i+1);
707 } 2074 }
708 } 2075 }
709 2076
710 /* construct our default format */ 2077 /* construct our default format */
711 } else { 2078 } else {
712 size_t fmt_len = 30; 2079 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 2080 out_format = xmalloc(sizeof(char) * fmt_len);
2081 *out_format = '\0';
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 2082 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 2083 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2084 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2085 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2086 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 2087 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2088 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2089 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 2090 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 2091 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 2092 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 2093 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2094 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2095 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2096 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 2097 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2098 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2099 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 2100 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 2101 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 2102 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 2103
726 /* now lets actually do the scanning */ 2104 /* now lets actually do the scanning */
2105 if (scan_ldpath || use_ldcache)
2106 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 2107 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 2108 if (scan_envpath) scanelf_envpath();
2109 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2110 from_file = "-";
2111 if (from_file) {
2112 scanelf_from_file(from_file);
2113 from_file = *argv;
2114 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 2115 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 2116 err("Nothing to scan !?");
731 while (optind < argc) 2117 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 2118 search_path = argv[optind++];
2119 ret = scanelf_dir(search_path);
2120 }
733 2121
734 /* clean up */ 2122 /* clean up */
735 if (find_sym) { 2123 xarrayfree(ldpaths);
2124 xarrayfree(find_lib_arr);
2125 xarrayfree(find_section_arr);
736 free(find_sym); 2126 free(find_lib);
737 free(versioned_symname); 2127 free(find_section);
738 }
739 if (out_format) free(out_format);
740}
741 2128
742 2129 if (ldcache != 0)
743 2130 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; 2131 return ret;
750} 2132}
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 2133
761 new_len = strlen(*dst) + strlen(src); 2134static 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{ 2135{
773 static char my_app[2]; 2136 const char *delims = " \t\n";
774 my_app[0] = append; 2137 char **envvals = NULL;
775 my_app[1] = '\0'; 2138 char *env, *s;
776 xstrcat(dst, my_app, curr_len); 2139 int nentry;
777} 2140
778static int xemptybuffer(const char *buff) 2141 if ((env = getenv(envvar)) == NULL)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0; 2142 return NULL;
2143
2144 env = xstrdup(env);
2145 if (env == NULL)
784 return 1; 2146 return NULL;
785}
786 2147
2148 s = strtok(env, delims);
2149 if (s == NULL) {
2150 free(env);
2151 return NULL;
2152 }
787 2153
2154 nentry = 0;
2155 while (s != NULL) {
2156 ++nentry;
2157 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2158 envvals[nentry-1] = s;
2159 s = strtok(NULL, delims);
2160 }
2161 envvals[nentry] = NULL;
2162
2163 /* don't want to free(env) as it contains the memory that backs
2164 * the envvals array of strings */
2165 return envvals;
2166}
2167
2168static void parseenv(void)
2169{
2170 color_init(false);
2171 qa_textrels = get_split_env("QA_TEXTRELS");
2172 qa_execstack = get_split_env("QA_EXECSTACK");
2173 qa_wx_load = get_split_env("QA_WX_LOAD");
2174}
2175
2176#ifdef __PAX_UTILS_CLEANUP
2177static void cleanup(void)
2178{
2179 free(out_format);
2180 free(qa_textrels);
2181 free(qa_execstack);
2182 free(qa_wx_load);
2183}
2184#endif
788 2185
789int main(int argc, char *argv[]) 2186int main(int argc, char *argv[])
790{ 2187{
2188 int ret;
791 if (argc < 2) 2189 if (argc < 2)
792 usage(EXIT_FAILURE); 2190 usage(EXIT_FAILURE);
2191 parseenv();
793 parseargs(argc, argv); 2192 ret = parseargs(argc, argv);
794 fclose(stdout); 2193 fclose(stdout);
795 return EXIT_SUCCESS; 2194#ifdef __PAX_UTILS_CLEANUP
2195 cleanup();
2196 warn("The calls to add/delete heap should be off:\n"
2197 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2198 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2199#endif
2200 return ret;
796} 2201}
2202
2203/* Match filename against entries in matchlist, return TRUE
2204 * if the file is listed */
2205static int file_matches_list(const char *filename, char **matchlist)
2206{
2207 char **file;
2208 char *match;
2209 char buf[__PAX_UTILS_PATH_MAX];
2210
2211 if (matchlist == NULL)
2212 return 0;
2213
2214 for (file = matchlist; *file != NULL; file++) {
2215 if (search_path) {
2216 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2217 match = buf;
2218 } else {
2219 match = *file;
2220 }
2221 if (fnmatch(match, filename, 0) == 0)
2222 return 1;
2223 }
2224 return 0;
2225}

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