/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.44 Revision 1.212
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 1.212 2009/03/15 09:13:20 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 * MA 02111-1307, USA.
22 */ 8 */
23 9
24#include <stdio.h>
25#include <stdlib.h>
26#include <sys/types.h>
27#define __USE_GNU
28#include <string.h>
29#include <errno.h>
30#include <unistd.h>
31#include <sys/stat.h>
32#include <dirent.h>
33#include <getopt.h>
34#include <assert.h>
35
36#include "paxelf.h"
37
38static const char *rcsid = "$Id: scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $"; 10static const char *rcsid = "$Id: scanelf.c,v 1.212 2009/03/15 09:13:20 vapier Exp $";
39#define argv0 "scanelf" 11const char * const argv0 = "scanelf";
40 12
13#include "paxinc.h"
41 14
15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
42 16
43/* prototypes */ 17/* prototypes */
44static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
19static int scanelf_elfobj(elfobj *elf);
20static int scanelf_elf(const char *filename, int fd, size_t len);
21static int scanelf_archive(const char *filename, int fd, size_t len);
22static int scanelf_file(const char *filename, const struct stat *st_cache);
45static void scanelf_dir(const char *path); 23static int scanelf_dir(const char *path);
46static void scanelf_ldpath(); 24static void scanelf_ldpath(void);
47static void scanelf_envpath(); 25static void scanelf_envpath(void);
48static void usage(int status); 26static void usage(int status);
27static char **get_split_env(const char *envvar);
28static void parseenv(void);
49static void parseargs(int argc, char *argv[]); 29static int parseargs(int argc, char *argv[]);
50static char *xstrdup(char *s); 30static int rematch(const char *regex, const char *match, int cflags);
51static void *xmalloc(size_t size);
52static void xstrcat(char **dst, const char *src, size_t *curr_len);
53static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54static int xemptybuffer(const char *buff);
55 31
56/* variables to control behavior */ 32/* variables to control behavior */
33static char match_etypes[126] = "";
34static char *ldpaths[256];
57static char scan_ldpath = 0; 35static char scan_ldpath = 0;
58static char scan_envpath = 0; 36static char scan_envpath = 0;
59static char scan_symlink = 1; 37static char scan_symlink = 1;
38static char scan_archives = 0;
60static char dir_recurse = 0; 39static char dir_recurse = 0;
61static char dir_crossmount = 1; 40static char dir_crossmount = 1;
62static char show_pax = 0; 41static char show_pax = 0;
42static char show_perms = 0;
63static char show_stack = 0; 43static char show_size = 0;
44static char show_phdr = 0;
64static char show_textrel = 0; 45static char show_textrel = 0;
65static char show_rpath = 0; 46static char show_rpath = 0;
66static char show_needed = 0; 47static char show_needed = 0;
67static char show_interp = 0; 48static char show_interp = 0;
49static char show_bind = 0;
50static char show_soname = 0;
51static char show_textrels = 0;
68static char show_banner = 1; 52static char show_banner = 1;
53static char show_endian = 0;
54static char show_osabi = 0;
55static char show_eabi = 0;
69static char be_quiet = 0; 56static char be_quiet = 0;
70static char be_verbose = 0; 57static char be_verbose = 0;
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 void *ldcache = NULL;
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 int sysret; \
479 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"; \
480 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
481 sysbuf = xmalloc(syslen); \
482 if (end_addr < r_offset) \
483 /* not uncommon when things are optimized out */ \
484 end_addr = r_offset + 0x100; \
485 snprintf(sysbuf, syslen, sysfmt, \
486 (unsigned long)offset_tmp, \
487 (unsigned long)end_addr, \
488 elf->filename, \
489 (unsigned long)r_offset); \
490 fflush(stdout); \
491 sysret = system(sysbuf); \
492 fflush(stdout); \
493 free(sysbuf); \
494 } \
495 } \
496 } }
497 SHOW_TEXTRELS(32)
498 SHOW_TEXTRELS(64)
499 }
500 if (!*found_textrels)
501 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
502
503 return NULL;
504}
505
506static void rpath_security_checks(elfobj *, char *, const char *);
507static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
508{
509 struct stat st;
510 switch (*item) {
511 case '/': break;
512 case '.':
513 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
514 break;
515 case ':':
516 case '\0':
517 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
518 break;
519 case '$':
520 if (fstat(elf->fd, &st) != -1)
521 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
522 warnf("Security problem with %s='%s' in %s with mode set of %o",
523 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
524 break;
525 default:
526 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
527 break;
528 }
529}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 530static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 531{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 532 unsigned long i, s;
173 char *rpath, *runpath; 533 char *rpath, *runpath, **r;
174 void *strtbl_void; 534 void *strtbl_void;
175 535
176 if (!show_rpath) return; 536 if (!show_rpath) return;
177 537
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 538 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 544 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 545 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 546 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 547 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 548 Elf ## B ## _Off offset; \
549 Elf ## B ## _Xword word; \
550 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 551 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
552 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 553 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
191 offset = EGET(phdr[i].p_offset); \ 554 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 555 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
556 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 557 dyn = DYN ## B (elf->data + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 558 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 559 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 560 r = &rpath; \
561 } else if (word == DT_RUNPATH) { \
562 r = &runpath; \
563 } else { \
564 ++dyn; \
565 continue; \
566 } \
567 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 568 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 569 if (offset < (Elf ## B ## _Off)elf->len) { \
570 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 571 *r = (char*)(elf->data + offset); \
572 /* cache the length in case we need to nuke this section later on */ \
573 if (fix_elf) \
574 offset = strlen(*r); \
575 /* If quiet, don't output paths in ld.so.conf */ \
576 if (be_quiet) { \
577 size_t len; \
578 char *start, *end; \
579 /* note that we only 'chop' off leading known paths. */ \
580 /* since *r is read-only memory, we can only move the ptr forward. */ \
581 start = *r; \
582 /* scan each path in : delimited list */ \
583 while (start) { \
584 rpath_security_checks(elf, start, get_elfdtype(word)); \
585 end = strchr(start, ':'); \
586 len = (end ? abs(end - start) : strlen(start)); \
587 if (use_ldcache) \
588 for (s = 0; ldpaths[s]; ++s) \
589 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
590 *r = end; \
591 /* corner case ... if RPATH reads "/usr/lib:", we want \
592 * to show ':' rather than '' */ \
593 if (end && end[1] != '\0') \
594 (*r)++; \
595 break; \
596 } \
597 if (!*r || !end) \
598 break; \
599 else \
600 start = start + len + 1; \
601 } \
602 } \
603 if (*r) { \
604 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
605 /* just nuke it */ \
606 nuke_it##B: \
607 memset(*r, 0x00, offset); \
608 *r = NULL; \
609 ESET(dyn->d_tag, DT_DEBUG); \
610 ESET(dyn->d_un.d_ptr, 0); \
611 } else if (fix_elf) { \
612 /* try to clean "bad" paths */ \
613 size_t len, tmpdir_len; \
614 char *start, *end; \
615 const char *tmpdir; \
616 start = *r; \
617 tmpdir = (getenv("TMPDIR") ? : "."); \
618 tmpdir_len = strlen(tmpdir); \
619 while (1) { \
620 end = strchr(start, ':'); \
621 if (start == end) { \
622 eat_this_path##B: \
623 len = strlen(end); \
624 memmove(start, end+1, len); \
625 start[len-1] = '\0'; \
626 end = start - 1; \
627 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
628 if (!end) { \
629 if (start == *r) \
630 goto nuke_it##B; \
631 *--start = '\0'; \
632 } else \
633 goto eat_this_path##B; \
634 } \
635 if (!end) \
636 break; \
637 start = end + 1; \
638 } \
639 if (**r == '\0') \
640 goto nuke_it##B; \
641 } \
642 if (*r) \
200 *found_rpath = 1; \ 643 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 644 } \
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 } \ 645 } \
208 ++dyn; \ 646 ++dyn; \
209 } \ 647 } \
210 } } 648 } }
211 SHOW_RPATH(32) 649 SHOW_RPATH(32)
212 SHOW_RPATH(64) 650 SHOW_RPATH(64)
213 } 651 }
652
653 if (be_wewy_wewy_quiet) return;
214 654
215 if (rpath && runpath) { 655 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 656 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 657 xstrcat(ret, runpath, ret_len);
218 } else { 658 } else {
226 } else if (rpath || runpath) 666 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 667 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 668 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 669 xstrcat(ret, " - ", ret_len);
230} 670}
671
672#define LDSO_CACHE_MAGIC "ld.so-"
673#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
674#define LDSO_CACHE_VER "1.7.0"
675#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
676#define FLAG_ANY -1
677#define FLAG_TYPE_MASK 0x00ff
678#define FLAG_LIBC4 0x0000
679#define FLAG_ELF 0x0001
680#define FLAG_ELF_LIBC5 0x0002
681#define FLAG_ELF_LIBC6 0x0003
682#define FLAG_REQUIRED_MASK 0xff00
683#define FLAG_SPARC_LIB64 0x0100
684#define FLAG_IA64_LIB64 0x0200
685#define FLAG_X8664_LIB64 0x0300
686#define FLAG_S390_LIB64 0x0400
687#define FLAG_POWERPC_LIB64 0x0500
688#define FLAG_MIPS64_LIBN32 0x0600
689#define FLAG_MIPS64_LIBN64 0x0700
690
691static char *lookup_cache_lib(elfobj *, char *);
692
693#if defined(__GLIBC__) || defined(__UCLIBC__)
694
695static char *lookup_cache_lib(elfobj *elf, char *fname)
696{
697 int fd;
698 char *strs;
699 static char buf[__PAX_UTILS_PATH_MAX] = "";
700 const char cachefile[] = "/etc/ld.so.cache";
701 struct stat st;
702
703 typedef struct {
704 char magic[LDSO_CACHE_MAGIC_LEN];
705 char version[LDSO_CACHE_VER_LEN];
706 int nlibs;
707 } header_t;
708 header_t *header;
709
710 typedef struct {
711 int flags;
712 int sooffset;
713 int liboffset;
714 } libentry_t;
715 libentry_t *libent;
716
717 if (fname == NULL)
718 return NULL;
719
720 if (ldcache == NULL) {
721 if (stat(cachefile, &st))
722 return NULL;
723
724 fd = open(cachefile, O_RDONLY);
725 if (fd == -1)
726 return NULL;
727
728 /* cache these values so we only map/unmap the cache file once */
729 ldcache_size = st.st_size;
730 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
731 close(fd);
732
733 if (ldcache == MAP_FAILED) {
734 ldcache = NULL;
735 return NULL;
736 }
737
738 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
739 memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
740 {
741 munmap(ldcache, ldcache_size);
742 ldcache = NULL;
743 return NULL;
744 }
745 } else
746 header = ldcache;
747
748 libent = ldcache + sizeof(header_t);
749 strs = (char *) &libent[header->nlibs];
750
751 for (fd = 0; fd < header->nlibs; ++fd) {
752 /* This should be more fine grained, but for now we assume that
753 * diff arches will not be cached together, and we ignore the
754 * the different multilib mips cases.
755 */
756 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
757 continue;
758 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
759 continue;
760
761 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
762 continue;
763
764 /* Return first hit because that is how the ldso rolls */
765 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
766 break;
767 }
768
769 return buf;
770}
771
772#elif defined(__NetBSD__)
773static char *lookup_cache_lib(elfobj *elf, char *fname)
774{
775 static char buf[__PAX_UTILS_PATH_MAX] = "";
776 static struct stat st;
777
778 char **ldpath;
779 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
780 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
781 continue; /* if the pathname is too long, or something went wrong, ignore */
782
783 if (stat(buf, &st) != 0)
784 continue; /* if the lib doesn't exist in *ldpath, look further */
785
786 /* NetBSD doesn't actually do sanity checks, it just loads the file
787 * and if that doesn't work, continues looking in other directories.
788 * This cannot easily be safely emulated, unfortunately. For now,
789 * just assume that if it exists, it's a valid library. */
790
791 return buf;
792 }
793
794 /* not found in any path */
795 return NULL;
796}
797#else
798#ifdef __ELF__
799#warning Cache support not implemented for your target
800#endif
801static char *lookup_cache_lib(elfobj *elf, char *fname)
802{
803 return NULL;
804}
805#endif
806
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 807static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 808{
233 unsigned long i; 809 unsigned long i;
234 char *needed; 810 char *needed;
235 void *strtbl_void; 811 void *strtbl_void;
812 char *p;
236 813
237 if (!show_needed) return; 814 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
238 815
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 816 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 817
241 if (elf->phdr && strtbl_void) { 818 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 819#define SHOW_NEEDED(B) \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 822 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 823 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 824 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
248 Elf ## B ## _Off offset; \ 825 Elf ## B ## _Off offset; \
249 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 826 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
250 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 827 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) 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)) continue; \
253 dyn = DYN ## B (elf->data + offset); \ 830 dyn = DYN ## B (elf->data + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 831 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 832 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 833 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 834 if (offset >= (Elf ## B ## _Off)elf->len) { \
835 ++dyn; \
836 continue; \
837 } \
258 needed = (char*)(elf->data + offset); \ 838 needed = (char*)(elf->data + offset); \
839 if (op == 0) { \
840 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 841 if (*found_needed) xchrcat(ret, ',', ret_len); \
842 if (use_ldcache) \
843 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
844 needed = p; \
260 xstrcat(ret, needed, ret_len); \ 845 xstrcat(ret, needed, ret_len); \
846 } \
261 *found_needed = 1; \ 847 *found_needed = 1; \
848 } else { \
849 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
850 *found_lib = 1; \
851 return (be_wewy_wewy_quiet ? NULL : needed); \
852 } \
853 } \
262 } \ 854 } \
263 ++dyn; \ 855 ++dyn; \
264 } \ 856 } \
265 } } 857 } }
266 SHOW_NEEDED(32) 858 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 859 SHOW_NEEDED(64)
860 if (op == 0 && !*found_needed && be_verbose)
861 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 862 }
863
864 return NULL;
269} 865}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 866static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 867{
272 void *strtbl_void; 868 void *strtbl_void;
273 869
278 if (strtbl_void) { 874 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 875#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 876 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 877 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 878 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 879 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 880 }
285 SHOW_INTERP(32) 881 SHOW_INTERP(32)
286 SHOW_INTERP(64) 882 SHOW_INTERP(64)
287 } 883 }
288 return NULL; 884 return NULL;
289} 885}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 886static char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 887{
292 unsigned long i; 888 unsigned long i;
889 struct stat s;
890 char dynamic = 0;
891
892 if (!show_bind) return NULL;
893 if (!elf->phdr) return NULL;
894
895#define SHOW_BIND(B) \
896 if (elf->elf_class == ELFCLASS ## B) { \
897 Elf ## B ## _Dyn *dyn; \
898 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
899 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
900 Elf ## B ## _Off offset; \
901 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
902 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
903 dynamic = 1; \
904 offset = EGET(phdr[i].p_offset); \
905 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
906 dyn = DYN ## B (elf->data + offset); \
907 while (EGET(dyn->d_tag) != DT_NULL) { \
908 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
909 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
910 { \
911 if (be_quiet) return NULL; \
912 *found_bind = 1; \
913 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
914 } \
915 ++dyn; \
916 } \
917 } \
918 }
919 SHOW_BIND(32)
920 SHOW_BIND(64)
921
922 if (be_wewy_wewy_quiet) return NULL;
923
924 /* don't output anything if quiet mode and the ELF is static or not setuid */
925 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
926 return NULL;
927 } else {
928 *found_bind = 1;
929 return (char *) (dynamic ? "LAZY" : "STATIC");
930 }
931}
932static char *scanelf_file_soname(elfobj *elf, char *found_soname)
933{
934 unsigned long i;
935 char *soname;
936 void *strtbl_void;
937
938 if (!show_soname) return NULL;
939
940 strtbl_void = elf_findsecbyname(elf, ".dynstr");
941
942 if (elf->phdr && strtbl_void) {
943#define SHOW_SONAME(B) \
944 if (elf->elf_class == ELFCLASS ## B) { \
945 Elf ## B ## _Dyn *dyn; \
946 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
947 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
948 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
949 Elf ## B ## _Off offset; \
950 /* only look for soname in shared objects */ \
951 if (EGET(ehdr->e_type) != ET_DYN) \
952 return NULL; \
953 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
954 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
955 offset = EGET(phdr[i].p_offset); \
956 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
957 dyn = DYN ## B (elf->data + offset); \
958 while (EGET(dyn->d_tag) != DT_NULL) { \
959 if (EGET(dyn->d_tag) == DT_SONAME) { \
960 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
961 if (offset >= (Elf ## B ## _Off)elf->len) { \
962 ++dyn; \
963 continue; \
964 } \
965 soname = (char*)(elf->data + offset); \
966 *found_soname = 1; \
967 return (be_wewy_wewy_quiet ? NULL : soname); \
968 } \
969 ++dyn; \
970 } \
971 } }
972 SHOW_SONAME(32)
973 SHOW_SONAME(64)
974 }
975
976 return NULL;
977}
978
979static int scanelf_match_symname(const char *symname, const char *tomatch) {
980 /* We do things differently when checking with regexp */
981 if (g_match) {
982 return rematch(symname, tomatch, REG_EXTENDED) == 0;
983 } else {
984 const size_t symname_len = strlen(symname);
985 return (strncmp(symname, tomatch, symname_len) == 0 &&
986 /* Accept unversioned symbol names */
987 (tomatch[symname_len] == '\0' || tomatch[symname_len] == '@'));
988 }
989}
990
991static char *scanelf_file_sym(elfobj *elf, char *found_sym)
992{
993 unsigned long i;
994 char *ret;
293 void *symtab_void, *strtab_void; 995 void *symtab_void, *strtab_void;
294 996
295 if (!find_sym) return NULL; 997 if (!find_sym) return NULL;
998 ret = find_sym;
296 999
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 1000 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 1001
300 if (symtab_void && strtab_void) { 1002 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 1003#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 1004 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 1005 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 1006 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 1007 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 1008 unsigned long cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 1009 char *symname; \
1010 if (cnt) \
1011 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 1012 for (i = 0; i < cnt; ++i) { \
1013 if ((void*)sym > (void*)elf->data_end) { \
1014 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1015 goto break_out; \
1016 } \
309 if (sym->st_name) { \ 1017 if (sym->st_name) { \
1018 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 1019 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
311 if (*find_sym == '*') { \ 1020 if ((void*)symname > (void*)elf->data_end) { \
1021 warnf("%s: corrupt ELF symbols", elf->filename); \
1022 ++sym; \
1023 continue; \
1024 } \
1025 /* debug display ... show all symbols and some extra info */ \
1026 if (0 && g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
312 printf("%s(%s) %5lX %15s %s\n", \ 1027 printf("%s(%s) %5lX %15s %s %s\n", \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 1028 ((*found_sym == 0) ? "\n\t" : "\t"), \
314 (char *)basename(filename), \ 1029 elf->base_filename, \
315 (long)sym->st_size, \ 1030 (unsigned long)sym->st_size, \
316 (char *)get_elfstttype(sym->st_info), \ 1031 get_elfstttype(sym->st_info), \
317 symname); \ 1032 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
318 *found_sym = 1; \ 1033 *found_sym = 1; \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 1034 } else { \
320 (strcmp(symname, versioned_symname) == 0)) \ 1035 /* allow the user to specify a comma delimited list of symbols to search for */ \
1036 char *this_sym, *next_sym; \
1037 next_sym = ret; \
1038 while (next_sym) { \
1039 this_sym = next_sym; \
1040 if ((next_sym = strchr(this_sym, ','))) \
1041 next_sym += 1; /* Skip the comma */ \
1042 /* do we want a defined symbol ? */ \
1043 if (*this_sym == '+') { \
1044 if (sym->st_shndx == SHN_UNDEF) \
1045 continue; \
1046 ++this_sym; \
1047 /* do we want an undefined symbol ? */ \
1048 } else if (*this_sym == '-') { \
1049 if (sym->st_shndx != SHN_UNDEF) \
1050 continue; \
1051 ++this_sym; \
1052 } \
1053 if (next_sym) /* Copy it so that we don't have to worry about the final , */ \
1054 this_sym = xstrndup(this_sym, next_sym-this_sym); \
1055 /* ok, lets compare the name now */ \
1056 if (scanelf_match_symname(this_sym, symname)) { \
1057 if (be_semi_verbose) { \
1058 char buf[126]; \
1059 snprintf(buf, sizeof(buf), "%lX %s %s", \
1060 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1061 ret = buf; \
1062 } else \
1063 ret = symname; \
321 (*found_sym)++; \ 1064 (*found_sym)++; \
1065 goto break_out; \
1066 } \
1067 if (next_sym) free(this_sym); \
1068 } \
1069 } \
322 } \ 1070 } \
323 ++sym; \ 1071 ++sym; \
324 } } 1072 } }
325 FIND_SYM(32) 1073 FIND_SYM(32)
326 FIND_SYM(64) 1074 FIND_SYM(64)
327 } 1075 }
1076
1077break_out:
1078 if (be_wewy_wewy_quiet) return NULL;
1079
328 if (*find_sym != '*' && *found_sym) 1080 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1081 return ret;
330 if (be_quiet) 1082 if (be_quiet)
331 return NULL; 1083 return NULL;
332 else 1084 else
333 return " - "; 1085 return (char *)" - ";
334} 1086}
1087
1088static char *scanelf_file_sections(elfobj *elf, char *found_section)
1089{
1090 if (!find_section)
1091 return NULL;
1092
1093#define FIND_SECTION(B) \
1094 if (elf->elf_class == ELFCLASS ## B) { \
1095 int invert; \
1096 Elf ## B ## _Shdr *section; \
1097 invert = (*find_section == '!' ? 1 : 0); \
1098 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1099 if ((section == NULL && invert) || (section != NULL && !invert)) \
1100 *found_section = 1; \
1101 }
1102 FIND_SECTION(32)
1103 FIND_SECTION(64)
1104
1105 if (be_wewy_wewy_quiet)
1106 return NULL;
1107
1108 if (*found_section)
1109 return find_section;
1110
1111 if (be_quiet)
1112 return NULL;
1113 else
1114 return (char *)" - ";
1115}
1116
335/* scan an elf file and show all the fun stuff */ 1117/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1118#define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
337static void scanelf_file(const char *filename) 1119static int scanelf_elfobj(elfobj *elf)
338{ 1120{
339 unsigned long i; 1121 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1122 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1123 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1124 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1125 static char *out_buffer = NULL;
346 static size_t out_len; 1126 static size_t out_len;
347 1127
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 = \ 1128 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1129 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1130 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1131
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) 1132 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1133 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1134 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1135 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1136 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1137 printf("%s: scanning file\n", elf->filename);
375 1138
376 /* init output buffer */ 1139 /* init output buffer */
377 if (!out_buffer) { 1140 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1141 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1142 out_buffer = xmalloc(out_len);
380 } 1143 }
381 *out_buffer = '\0'; 1144 *out_buffer = '\0';
382 1145
383 /* show the header */ 1146 /* show the header */
384 if (!be_quiet && show_banner) { 1147 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1148 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1149 if (!IS_MODIFIER(out_format[i])) continue;
387 1150
388 switch (out_format[++i]) { 1151 switch (out_format[++i]) {
1152 case '+': break;
389 case '%': break; 1153 case '%': break;
1154 case '#': break;
1155 case 'F':
1156 case 'p':
390 case 'F': prints("FILE "); break; 1157 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1158 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1159 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1160 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1161 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1162 case 'r': prints("RPATH "); break;
1163 case 'M': prints("CLASS "); break;
396 case 'n': prints("NEEDED "); break; 1164 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1165 case 'i': prints("INTERP "); break;
1166 case 'b': prints("BIND "); break;
1167 case 'Z': prints("SIZE "); break;
1168 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1169 case 's': prints("SYM "); break;
1170 case 'N': prints("LIB "); break;
1171 case 'T': prints("TEXTRELS "); break;
1172 case 'k': prints("SECTION "); break;
1173 case 'a': prints("ARCH "); break;
1174 case 'I': prints("OSABI "); break;
1175 case 'Y': prints("EABI "); break;
1176 case 'O': prints("PERM "); break;
1177 case 'D': prints("ENDIAN "); break;
1178 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1179 }
400 } 1180 }
1181 if (!found_file) prints("FILE ");
401 prints("\n"); 1182 prints("\n");
1183 found_file = 0;
402 show_banner = 0; 1184 show_banner = 0;
403 } 1185 }
404 1186
405 /* dump all the good stuff */ 1187 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1188 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1189 const char *out;
408 1190 const char *tmp;
409 /* make sure we trim leading spaces in quiet mode */ 1191 static char ubuf[sizeof(unsigned long)*2];
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) 1192 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); 1193 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1194 continue;
416 } 1195 }
417 1196
418 out = NULL; 1197 out = NULL;
1198 be_wewy_wewy_quiet = (out_format[i] == '#');
1199 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1200 switch (out_format[++i]) {
1201 case '+':
1202 case '%':
1203 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1204 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1205 case 'F':
1206 found_file = 1;
1207 if (be_wewy_wewy_quiet) break;
1208 xstrcat(&out_buffer, elf->filename, &out_len);
1209 break;
1210 case 'p':
1211 found_file = 1;
1212 if (be_wewy_wewy_quiet) break;
1213 tmp = elf->filename;
1214 if (search_path) {
1215 ssize_t len_search = strlen(search_path);
1216 ssize_t len_file = strlen(elf->filename);
1217 if (!strncmp(elf->filename, search_path, len_search) && \
1218 len_file > len_search)
1219 tmp += len_search;
1220 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1221 }
1222 xstrcat(&out_buffer, tmp, &out_len);
1223 break;
1224 case 'f':
1225 found_file = 1;
1226 if (be_wewy_wewy_quiet) break;
1227 tmp = strrchr(elf->filename, '/');
1228 tmp = (tmp == NULL ? elf->filename : tmp+1);
1229 xstrcat(&out_buffer, tmp, &out_len);
1230 break;
422 case 'o': out = get_elfetype(elf); break; 1231 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1232 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1233 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; 1234 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1235 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; 1236 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1237 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1238 case 'D': out = get_endian(elf); break;
1239 case 'O': out = strfileperms(elf->filename); break;
1240 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1241 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; 1242 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1243 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1244 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1245 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1246 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1247 case 'a': out = get_elfemtype(elf); break;
1248 case 'I': out = get_elfosabi(elf); break;
1249 case 'Y': out = get_elf_eabi(elf); break;
1250 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1251 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1252 }
1253 if (out) {
1254 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1255 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1256 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1257 else
431 if (out) xstrcat(&out_buffer, out, &out_len); 1258 xstrcat(&out_buffer, out, &out_len);
432 } 1259 }
1260 }
433 1261
434 if (!found_file) { 1262#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1263 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1264 found_rpath || found_needed || found_interp || found_bind || \
1265 found_soname || found_sym || found_lib || found_textrels || found_section )
1266
1267 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1268 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1269 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1270 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1271 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1272 puts(out_buffer);
1273 fflush(stdout);
1274 }
441 1275
1276 return 0;
1277}
1278
1279/* scan a single elf */
1280static int scanelf_elf(const char *filename, int fd, size_t len)
1281{
1282 int ret = 1;
1283 elfobj *elf;
1284
1285 /* verify this is real ELF */
1286 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1287 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1288 return ret;
1289 }
1290 switch (match_bits) {
1291 case 32:
1292 if (elf->elf_class != ELFCLASS32)
1293 goto label_done;
1294 break;
1295 case 64:
1296 if (elf->elf_class != ELFCLASS64)
1297 goto label_done;
1298 break;
1299 default: break;
1300 }
1301 if (strlen(match_etypes)) {
1302 char sbuf[126];
1303 strncpy(sbuf, match_etypes, sizeof(sbuf));
1304 if (strchr(match_etypes, ',') != NULL) {
1305 char *p;
1306 while ((p = strrchr(sbuf, ',')) != NULL) {
1307 *p = 0;
1308 if (etype_lookup(p+1) == get_etype(elf))
1309 goto label_ret;
1310 }
1311 }
1312 if (etype_lookup(sbuf) != get_etype(elf))
1313 goto label_done;
1314 }
1315
1316label_ret:
1317 ret = scanelf_elfobj(elf);
1318
1319label_done:
442 unreadelf(elf); 1320 unreadelf(elf);
1321 return ret;
1322}
1323
1324/* scan an archive of elfs */
1325static int scanelf_archive(const char *filename, int fd, size_t len)
1326{
1327 archive_handle *ar;
1328 archive_member *m;
1329 char *ar_buffer;
1330 elfobj *elf;
1331
1332 ar = ar_open_fd(filename, fd);
1333 if (ar == NULL)
1334 return 1;
1335
1336 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1337 while ((m=ar_next(ar)) != NULL) {
1338 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1339 if (elf) {
1340 scanelf_elfobj(elf);
1341 unreadelf(elf);
1342 }
1343 }
1344 munmap(ar_buffer, len);
1345
1346 return 0;
1347}
1348/* scan a file which may be an elf or an archive or some other magical beast */
1349static int scanelf_file(const char *filename, const struct stat *st_cache)
1350{
1351 const struct stat *st = st_cache;
1352 struct stat symlink_st;
1353 int fd;
1354
1355 /* always handle regular files and handle symlinked files if no -y */
1356 if (S_ISLNK(st->st_mode)) {
1357 if (!scan_symlink) return 1;
1358 stat(filename, &symlink_st);
1359 st = &symlink_st;
1360 }
1361
1362 if (!S_ISREG(st->st_mode)) {
1363 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1364 return 1;
1365 }
1366
1367 if (match_perms) {
1368 if ((st->st_mode | match_perms) != st->st_mode)
1369 return 1;
1370 }
1371 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1372 return 1;
1373
1374 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1375 /* if it isn't an ELF, maybe it's an .a archive */
1376 scanelf_archive(filename, fd, st->st_size);
1377
1378 close(fd);
1379 return 0;
443} 1380}
444 1381
445/* scan a directory for ET_EXEC files and print when we find one */ 1382/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1383static int scanelf_dir(const char *path)
447{ 1384{
448 register DIR *dir; 1385 register DIR *dir;
449 register struct dirent *dentry; 1386 register struct dirent *dentry;
450 struct stat st_top, st; 1387 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1388 char buf[__PAX_UTILS_PATH_MAX];
452 size_t pathlen = 0, len = 0; 1389 size_t pathlen = 0, len = 0;
1390 int ret = 0;
453 1391
454 /* make sure path exists */ 1392 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1393 if (lstat(path, &st_top) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1394 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1395 return 1;
458 } 1396 }
459 1397
460 /* ok, if it isn't a directory, assume we can open it */ 1398 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1399 if (!S_ISDIR(st_top.st_mode)) {
462 scanelf_file(path); 1400 return scanelf_file(path, &st_top);
463 return;
464 } 1401 }
465 1402
466 /* now scan the dir looking for fun stuff */ 1403 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1404 if ((dir = opendir(path)) == NULL) {
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1405 warnf("could not opendir %s: %s", path, strerror(errno));
469 return; 1406 return 1;
470 } 1407 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1408 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1409
473 pathlen = strlen(path); 1410 pathlen = strlen(path);
474 while ((dentry = readdir(dir))) { 1411 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1412 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1413 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1414 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
478 if (len >= sizeof(buf)) { 1415 if (len >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1416 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1417 (unsigned long)len, (unsigned long)sizeof(buf));
480 continue; 1418 continue;
481 } 1419 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1420 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
483 if (lstat(buf, &st) != -1) { 1421 if (lstat(buf, &st) != -1) {
484 if (S_ISREG(st.st_mode)) 1422 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1423 ret = scanelf_file(buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1424 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1425 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1426 ret = scanelf_dir(buf);
489 } 1427 }
490 } 1428 }
491 } 1429 }
492 closedir(dir); 1430 closedir(dir);
1431 return ret;
493} 1432}
1433
1434static int scanelf_from_file(const char *filename)
1435{
1436 FILE *fp = NULL;
1437 char *p;
1438 char path[__PAX_UTILS_PATH_MAX];
1439 int ret = 0;
1440
1441 if (strcmp(filename, "-") == 0)
1442 fp = stdin;
1443 else if ((fp = fopen(filename, "r")) == NULL)
1444 return 1;
1445
1446 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1447 if ((p = strchr(path, '\n')) != NULL)
1448 *p = 0;
1449 search_path = path;
1450 ret = scanelf_dir(path);
1451 }
1452 if (fp != stdin)
1453 fclose(fp);
1454 return ret;
1455}
1456
1457#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1458
1459static int load_ld_cache_config(int i, const char *fname)
1460{
1461 FILE *fp = NULL;
1462 char *p;
1463 char path[__PAX_UTILS_PATH_MAX];
1464
1465 if (i + 1 == ARRAY_SIZE(ldpaths))
1466 return i;
1467
1468 if ((fp = fopen(fname, "r")) == NULL)
1469 return i;
1470
1471 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1472 if ((p = strrchr(path, '\r')) != NULL)
1473 *p = 0;
1474 if ((p = strchr(path, '\n')) != NULL)
1475 *p = 0;
1476#ifdef __linux__
1477 /* recursive includes of the same file will make this segfault. */
1478 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1479 glob64_t gl;
1480 size_t x;
1481 char gpath[__PAX_UTILS_PATH_MAX];
1482
1483 memset(gpath, 0, sizeof(gpath));
1484
1485 if (path[8] != '/')
1486 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1487 else
1488 strncpy(gpath, &path[8], sizeof(gpath));
1489
1490 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1491 for (x = 0; x < gl.gl_pathc; ++x) {
1492 /* try to avoid direct loops */
1493 if (strcmp(gl.gl_pathv[x], fname) == 0)
1494 continue;
1495 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1496 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1497 globfree64(&gl);
1498 return i;
1499 }
1500 }
1501 globfree64 (&gl);
1502 continue;
1503 }
1504 }
1505#endif
1506 if (*path != '/')
1507 continue;
1508
1509 ldpaths[i++] = xstrdup(path);
1510
1511 if (i + 1 == ARRAY_SIZE(ldpaths))
1512 break;
1513 }
1514 ldpaths[i] = NULL;
1515
1516 fclose(fp);
1517 return i;
1518}
1519
1520#elif defined(__FreeBSD__) || defined(__DragonFly__)
1521
1522static int load_ld_cache_config(int i, const char *fname)
1523{
1524 FILE *fp = NULL;
1525 char *b = NULL, *p;
1526 struct elfhints_hdr hdr;
1527
1528 if (i + 1 == ARRAY_SIZE(ldpaths))
1529 return i;
1530
1531 if ((fp = fopen(fname, "r")) == NULL)
1532 return i;
1533
1534 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1535 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1536 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1537 {
1538 fclose(fp);
1539 return i;
1540 }
1541
1542 b = xmalloc(hdr.dirlistlen + 1);
1543 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1544 fclose(fp);
1545 free(b);
1546 return i;
1547 }
1548
1549 while ((p = strsep(&b, ":"))) {
1550 if (*p == '\0') continue;
1551 ldpaths[i++] = xstrdup(p);
1552
1553 if (i + 1 == ARRAY_SIZE(ldpaths))
1554 break;
1555 }
1556 ldpaths[i] = NULL;
1557
1558 free(b);
1559 fclose(fp);
1560 return i;
1561}
1562
1563#else
1564#ifdef __ELF__
1565#warning Cache config support not implemented for your target
1566#endif
1567static int load_ld_cache_config(int i, const char *fname)
1568{
1569 memset(ldpaths, 0x00, sizeof(ldpaths));
1570 return 0;
1571}
1572#endif
494 1573
495/* scan /etc/ld.so.conf for paths */ 1574/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1575static void scanelf_ldpath(void)
497{ 1576{
498 char scan_l, scan_ul, scan_ull; 1577 char scan_l, scan_ul, scan_ull;
499 char *path, *p; 1578 int i = 0;
500 FILE *fp;
501 1579
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1580 if (!ldpaths[0])
503 err("Unable to open ld.so.conf: %s", strerror(errno)); 1581 err("Unable to load any paths from ld.so.conf");
504 1582
505 scan_l = scan_ul = scan_ull = 0; 1583 scan_l = scan_ul = scan_ull = 0;
506 1584
507 path = (char*)xmalloc(_POSIX_PATH_MAX); 1585 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; 1586 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
515 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1587 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
516 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1588 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
517 scanelf_dir(path); 1589 scanelf_dir(ldpaths[i]);
1590 ++i;
518 } 1591 }
519 free(path);
520 fclose(fp);
521 1592
522 if (!scan_l) scanelf_dir("/lib"); 1593 if (!scan_l) scanelf_dir("/lib");
523 if (!scan_ul) scanelf_dir("/usr/lib"); 1594 if (!scan_ul) scanelf_dir("/usr/lib");
524 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1595 if (!scan_ull) scanelf_dir("/usr/local/lib");
525} 1596}
526 1597
527/* scan env PATH for paths */ 1598/* scan env PATH for paths */
528static void scanelf_envpath() 1599static void scanelf_envpath(void)
529{ 1600{
530 char *path, *p; 1601 char *path, *p;
531 1602
532 path = getenv("PATH"); 1603 path = getenv("PATH");
533 if (!path) 1604 if (!path)
540 } 1611 }
541 1612
542 free(path); 1613 free(path);
543} 1614}
544 1615
545 1616/* 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" 1617#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZBhV"
549#define a_argument required_argument 1618#define a_argument required_argument
550static struct option const long_opts[] = { 1619static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1620 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1621 {"ldpath", no_argument, NULL, 'l'},
553 {"recursive", no_argument, NULL, 'R'}, 1622 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1623 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1624 {"symlink", no_argument, NULL, 'y'},
1625 {"archives", no_argument, NULL, 'A'},
1626 {"ldcache", no_argument, NULL, 'L'},
1627 {"fix", no_argument, NULL, 'X'},
1628 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1629 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1630 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1631 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1632 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1633 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1634 {"interp", no_argument, NULL, 'i'},
1635 {"bind", no_argument, NULL, 'b'},
1636 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1637 {"symbol", a_argument, NULL, 's'},
1638 {"section", a_argument, NULL, 'k'},
1639 {"lib", a_argument, NULL, 'N'},
1640 {"gmatch", no_argument, NULL, 'g'},
1641 {"textrels", no_argument, NULL, 'T'},
1642 {"etype", a_argument, NULL, 'E'},
1643 {"bits", a_argument, NULL, 'M'},
1644 {"endian", no_argument, NULL, 'D'},
1645 {"osabi", no_argument, NULL, 'I'},
1646 {"eabi", no_argument, NULL, 'Y'},
1647 {"perms", a_argument, NULL, 'O'},
1648 {"size", no_argument, NULL, 'Z'},
563 {"all", no_argument, NULL, 'a'}, 1649 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1650 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1651 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1652 {"format", a_argument, NULL, 'F'},
1653 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1654 {"file", a_argument, NULL, 'o'},
568 {"nobanner", no_argument, NULL, 'B'}, 1655 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1656 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1657 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1658 {NULL, no_argument, NULL, 0x0}
572}; 1659};
1660
573static char *opts_help[] = { 1661static const char *opts_help[] = {
574 "Scan all directories in PATH environment", 1662 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1663 "Scan all directories in /etc/ld.so.conf",
576 "Scan directories recursively", 1664 "Scan directories recursively",
577 "Don't recursively cross mount points", 1665 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1666 "Don't scan symlinks",
1667 "Scan archives (.a files)",
1668 "Utilize ld.so.cache information (use with -r/-n)",
1669 "Try and 'fix' bad things (use with -r/-e)",
1670 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 1671 "Print PaX markings",
580 "Print GNU_STACK markings", 1672 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 1673 "Print TEXTREL information",
582 "Print RPATH information", 1674 "Print RPATH information",
583 "Print NEEDED information", 1675 "Print NEEDED information",
584 "Print INTERP information", 1676 "Print INTERP information",
1677 "Print BIND information",
1678 "Print SONAME information",
585 "Find a specified symbol", 1679 "Find a specified symbol",
1680 "Find a specified section",
1681 "Find a specified library",
1682 "Use strncmp to match libraries. (use with -N)",
1683 "Locate cause of TEXTREL",
1684 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1685 "Print only ELF files matching numeric bits",
1686 "Print Endianness",
1687 "Print OSABI",
1688 "Print EABI (EM_ARM Only)",
1689 "Print only ELF files matching octal permissions",
1690 "Print ELF file size",
586 "Print all scanned info (-x -e -t -r)\n", 1691 "Print all scanned info (-x -e -t -r -b)\n",
587 "Only output 'bad' things", 1692 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 1693 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 1694 "Use specified format for output",
1695 "Read input stream from a filename",
590 "Write output stream to a filename", 1696 "Write output stream to a filename",
591 "Don't display the header", 1697 "Don't display the header",
592 "Print this help and exit", 1698 "Print this help and exit",
593 "Print version and exit", 1699 "Print version and exit",
594 NULL 1700 NULL
596 1702
597/* display usage and exit */ 1703/* display usage and exit */
598static void usage(int status) 1704static void usage(int status)
599{ 1705{
600 unsigned long i; 1706 unsigned long i;
601 printf(" Scan ELF binaries for stuff\n\n" 1707 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1708 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 1709 printf("Options: -[%s]\n", PARSE_FLAGS);
604 for (i = 0; long_opts[i].name; ++i) 1710 for (i = 0; long_opts[i].name; ++i)
605 if (long_opts[i].has_arg == no_argument) 1711 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1712 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
607 long_opts[i].name, opts_help[i]); 1713 long_opts[i].name, opts_help[i]);
608 else 1714 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1715 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
610 long_opts[i].name, opts_help[i]); 1716 long_opts[i].name, opts_help[i]);
1717
1718 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 1719 exit(status);
612} 1720}
613 1721
614/* parse command line arguments and preform needed actions */ 1722/* parse command line arguments and preform needed actions */
1723#define do_pax_state(option, flag) \
1724 if (islower(option)) { \
1725 flags &= ~PF_##flag; \
1726 flags |= PF_NO##flag; \
1727 } else { \
1728 flags &= ~PF_NO##flag; \
1729 flags |= PF_##flag; \
1730 }
615static void parseargs(int argc, char *argv[]) 1731static int parseargs(int argc, char *argv[])
616{ 1732{
617 int flag; 1733 int i;
1734 const char *from_file = NULL;
1735 int ret = 0;
618 1736
619 opterr = 0; 1737 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1738 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 1739 switch (i) {
622 1740
623 case 'V': 1741 case 'V':
624 printf("%s compiled %s\n%s\n" 1742 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1743 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 1744 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 1745 exit(EXIT_SUCCESS);
628 break; 1746 break;
629 case 'h': usage(EXIT_SUCCESS); break; 1747 case 'h': usage(EXIT_SUCCESS); break;
630 1748 case 'f':
1749 if (from_file) warn("You prob don't want to specify -f twice");
1750 from_file = optarg;
1751 break;
1752 case 'E':
1753 strncpy(match_etypes, optarg, sizeof(match_etypes));
1754 break;
1755 case 'M':
1756 match_bits = atoi(optarg);
1757 if (match_bits == 0) {
1758 if (strcmp(optarg, "ELFCLASS32") == 0)
1759 match_bits = 32;
1760 if (strcmp(optarg, "ELFCLASS64") == 0)
1761 match_bits = 64;
1762 }
1763 break;
1764 case 'O':
1765 if (sscanf(optarg, "%o", &match_perms) == -1)
1766 match_bits = 0;
1767 break;
631 case 'o': { 1768 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 1769 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL)
635 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1770 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 1771 break;
638 } 1772 }
639 1773 case 'k':
1774 if (find_section) warn("You prob don't want to specify -k twice");
1775 find_section = optarg;
1776 break;
640 case 's': { 1777 case 's': {
641 size_t len; 1778 if (find_sym) warn("You prob don't want to specify -s twice");
642 find_sym = xstrdup(optarg); 1779 find_sym = optarg;
643 len = strlen(find_sym) + 1; 1780 break;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1781 }
645 sprintf(versioned_symname, "%s@", find_sym); 1782 case 'N': {
1783 if (find_lib) warn("You prob don't want to specify -N twice");
1784 find_lib = optarg;
646 break; 1785 break;
647 } 1786 }
648 1787
649 case 'F': { 1788 case 'F': {
1789 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 1790 out_format = optarg;
1791 break;
1792 }
1793 case 'z': {
1794 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1795 size_t x;
1796
1797 for (x = 0; x < strlen(optarg); x++) {
1798 switch (optarg[x]) {
1799 case 'p':
1800 case 'P':
1801 do_pax_state(optarg[x], PAGEEXEC);
651 break; 1802 break;
1803 case 's':
1804 case 'S':
1805 do_pax_state(optarg[x], SEGMEXEC);
1806 break;
1807 case 'm':
1808 case 'M':
1809 do_pax_state(optarg[x], MPROTECT);
1810 break;
1811 case 'e':
1812 case 'E':
1813 do_pax_state(optarg[x], EMUTRAMP);
1814 break;
1815 case 'r':
1816 case 'R':
1817 do_pax_state(optarg[x], RANDMMAP);
1818 break;
1819 case 'x':
1820 case 'X':
1821 do_pax_state(optarg[x], RANDEXEC);
1822 break;
1823 default:
1824 break;
1825 }
652 } 1826 }
653 1827 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1828 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1829 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1830 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1831 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1832 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1833 setpax = flags;
1834 break;
1835 }
1836 case 'Z': show_size = 1; break;
1837 case 'g': g_match = 1; break;
1838 case 'L': use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 1839 case 'y': scan_symlink = 0; break;
1840 case 'A': scan_archives = 1; break;
655 case 'B': show_banner = 0; break; 1841 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 1842 case 'l': scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 1843 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 1844 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 1845 case 'm': dir_crossmount = 0; break;
1846 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 1847 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 1848 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 1849 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 1850 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 1851 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 1852 case 'i': show_interp = 1; break;
1853 case 'b': show_bind = 1; break;
1854 case 'S': show_soname = 1; break;
1855 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 1856 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1857 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; 1858 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
669 1859 case 'D': show_endian = 1; break;
1860 case 'I': show_osabi = 1; break;
1861 case 'Y': show_eabi = 1; break;
670 case ':': 1862 case ':':
671 warn("Option missing parameter\n"); 1863 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 1864 case '?':
675 warn("Unknown option\n"); 1865 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 1866 default:
679 err("Unhandled option '%c'", flag); 1867 err("Unhandled option '%c'; please report this", i);
680 break;
681 }
682 } 1868 }
683 1869 }
684 if (be_quiet && be_verbose) 1870 if (show_textrels && be_verbose) {
685 err("You can be quiet or you can be verbose, not both, stupid"); 1871 if (which("objdump") != NULL)
686 1872 has_objdump = 1;
1873 }
687 /* let the format option override all other options */ 1874 /* let the format option override all other options */
688 if (out_format) { 1875 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1876 show_pax = show_phdr = show_textrel = show_rpath = \
1877 show_needed = show_interp = show_bind = show_soname = \
1878 show_textrels = show_perms = show_endian = show_size = \
1879 show_osabi = show_eabi = 0;
690 for (flag=0; out_format[flag]; ++flag) { 1880 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 1881 if (!IS_MODIFIER(out_format[i])) continue;
692 1882
693 switch (out_format[++flag]) { 1883 switch (out_format[++i]) {
1884 case '+': break;
694 case '%': break; 1885 case '%': break;
1886 case '#': break;
695 case 'F': break; 1887 case 'F': break;
1888 case 'p': break;
1889 case 'f': break;
1890 case 'k': break;
696 case 's': break; 1891 case 's': break;
1892 case 'N': break;
697 case 'o': break; 1893 case 'o': break;
1894 case 'a': break;
1895 case 'M': break;
1896 case 'Z': show_size = 1; break;
1897 case 'D': show_endian = 1; break;
1898 case 'I': show_osabi = 1; break;
1899 case 'Y': show_eabi = 1; break;
1900 case 'O': show_perms = 1; break;
698 case 'x': show_pax = 1; break; 1901 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 1902 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 1903 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 1904 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 1905 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 1906 case 'i': show_interp = 1; break;
1907 case 'b': show_bind = 1; break;
1908 case 'S': show_soname = 1; break;
1909 case 'T': show_textrels = 1; break;
704 default: 1910 default:
705 err("Invalid format specifier '%c' (byte %i)", 1911 err("Invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 1912 out_format[i], i+1);
707 } 1913 }
708 } 1914 }
709 1915
710 /* construct our default format */ 1916 /* construct our default format */
711 } else { 1917 } else {
712 size_t fmt_len = 30; 1918 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1919 out_format = xmalloc(sizeof(char) * fmt_len);
1920 *out_format = '\0';
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1921 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1922 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1923 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
1924 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
1925 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1926 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
1927 if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
1928 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1929 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1930 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1931 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1932 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1933 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1934 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1935 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1936 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1937 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1938 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1939 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 1940 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 1941 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 1942
726 /* now lets actually do the scanning */ 1943 /* now lets actually do the scanning */
1944 if (scan_ldpath || use_ldcache)
1945 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 1946 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 1947 if (scan_envpath) scanelf_envpath();
1948 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1949 from_file = "-";
1950 if (from_file) {
1951 scanelf_from_file(from_file);
1952 from_file = *argv;
1953 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 1954 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 1955 err("Nothing to scan !?");
731 while (optind < argc) 1956 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 1957 search_path = argv[optind++];
1958 ret = scanelf_dir(search_path);
1959 }
733 1960
734 /* clean up */ 1961 /* clean up */
735 if (find_sym) { 1962 for (i = 0; ldpaths[i]; ++i)
736 free(find_sym); 1963 free(ldpaths[i]);
737 free(versioned_symname);
738 }
739 if (out_format) free(out_format);
740}
741 1964
742 1965 if (ldcache != 0)
743 1966 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; 1967 return ret;
750} 1968}
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 1969
761 new_len = strlen(*dst) + strlen(src); 1970static 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{ 1971{
773 static char my_app[2]; 1972 const char *delims = " \t\n";
774 my_app[0] = append; 1973 char **envvals = NULL;
775 my_app[1] = '\0'; 1974 char *env, *s;
776 xstrcat(dst, my_app, curr_len); 1975 int nentry;
777} 1976
778static int xemptybuffer(const char *buff) 1977 if ((env = getenv(envvar)) == NULL)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0; 1978 return NULL;
1979
1980 env = xstrdup(env);
1981 if (env == NULL)
784 return 1; 1982 return NULL;
785}
786 1983
1984 s = strtok(env, delims);
1985 if (s == NULL) {
1986 free(env);
1987 return NULL;
1988 }
787 1989
1990 nentry = 0;
1991 while (s != NULL) {
1992 ++nentry;
1993 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1994 envvals[nentry-1] = s;
1995 s = strtok(NULL, delims);
1996 }
1997 envvals[nentry] = NULL;
1998
1999 /* don't want to free(env) as it contains the memory that backs
2000 * the envvals array of strings */
2001 return envvals;
2002}
2003
2004static void parseenv(void)
2005{
2006 qa_textrels = get_split_env("QA_TEXTRELS");
2007 qa_execstack = get_split_env("QA_EXECSTACK");
2008 qa_wx_load = get_split_env("QA_WX_LOAD");
2009}
2010
2011#ifdef __PAX_UTILS_CLEANUP
2012static void cleanup(void)
2013{
2014 free(out_format);
2015 free(qa_textrels);
2016 free(qa_execstack);
2017 free(qa_wx_load);
2018}
2019#endif
788 2020
789int main(int argc, char *argv[]) 2021int main(int argc, char *argv[])
790{ 2022{
2023 int ret;
791 if (argc < 2) 2024 if (argc < 2)
792 usage(EXIT_FAILURE); 2025 usage(EXIT_FAILURE);
2026 parseenv();
793 parseargs(argc, argv); 2027 ret = parseargs(argc, argv);
794 fclose(stdout); 2028 fclose(stdout);
795 return EXIT_SUCCESS; 2029#ifdef __PAX_UTILS_CLEANUP
2030 cleanup();
2031 warn("The calls to add/delete heap should be off:\n"
2032 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
2033 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2034#endif
2035 return ret;
796} 2036}
2037
2038/* Match filename against entries in matchlist, return TRUE
2039 * if the file is listed */
2040static int file_matches_list(const char *filename, char **matchlist)
2041{
2042 char **file;
2043 char *match;
2044 char buf[__PAX_UTILS_PATH_MAX];
2045
2046 if (matchlist == NULL)
2047 return 0;
2048
2049 for (file = matchlist; *file != NULL; file++) {
2050 if (search_path) {
2051 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2052 match = buf;
2053 } else {
2054 match = *file;
2055 }
2056 if (fnmatch(match, filename, 0) == 0)
2057 return 1;
2058 }
2059 return 0;
2060}

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