/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.44 Revision 1.152
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 2 * Copyright 2003-2006 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 1.152 2006/05/14 23:49:56 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2006 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" 10#include "paxinc.h"
37 11
38static const char *rcsid = "$Id: scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $"; 12static const char *rcsid = "$Id: scanelf.c,v 1.152 2006/05/14 23:49:56 vapier Exp $";
39#define argv0 "scanelf" 13#define argv0 "scanelf"
40 14
15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17#define do_state(option, flag) \
18 if (islower(option)) { \
19 flags &= ~PF_##flag; \
20 flags |= PF_NO##flag; \
21 } else { \
22 flags &= ~PF_NO##flag; \
23 flags |= PF_##flag; \
24 }
41 25
42 26
43/* prototypes */ 27/* prototypes */
28static int file_matches_list(const char *filename, char **matchlist);
29static int scanelf_elfobj(elfobj *elf);
30static int scanelf_elf(const char *filename, int fd, size_t len);
31static int scanelf_archive(const char *filename, int fd, size_t len);
44static void scanelf_file(const char *filename); 32static void scanelf_file(const char *filename);
45static void scanelf_dir(const char *path); 33static void scanelf_dir(const char *path);
46static void scanelf_ldpath(); 34static void scanelf_ldpath(void);
47static void scanelf_envpath(); 35static void scanelf_envpath(void);
48static void usage(int status); 36static void usage(int status);
37static char **get_split_env(const char *envvar);
38static void parseenv(void);
49static void parseargs(int argc, char *argv[]); 39static void parseargs(int argc, char *argv[]);
50static char *xstrdup(char *s); 40static char *xstrdup(const char *s);
51static void *xmalloc(size_t size); 41static void *xmalloc(size_t size);
42static void *xrealloc(void *ptr, size_t size);
52static void xstrcat(char **dst, const char *src, size_t *curr_len); 43static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
44#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
53static inline void xchrcat(char **dst, const char append, size_t *curr_len); 45static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54static int xemptybuffer(const char *buff);
55 46
56/* variables to control behavior */ 47/* variables to control behavior */
48static char match_etypes[126] = "";
49static char *ldpaths[256];
57static char scan_ldpath = 0; 50static char scan_ldpath = 0;
58static char scan_envpath = 0; 51static char scan_envpath = 0;
59static char scan_symlink = 1; 52static char scan_symlink = 1;
53static char scan_archives = 0;
60static char dir_recurse = 0; 54static char dir_recurse = 0;
61static char dir_crossmount = 1; 55static char dir_crossmount = 1;
62static char show_pax = 0; 56static char show_pax = 0;
63static char show_stack = 0; 57static char show_phdr = 0;
64static char show_textrel = 0; 58static char show_textrel = 0;
65static char show_rpath = 0; 59static char show_rpath = 0;
66static char show_needed = 0; 60static char show_needed = 0;
67static char show_interp = 0; 61static char show_interp = 0;
62static char show_bind = 0;
63static char show_soname = 0;
64static char show_textrels = 0;
68static char show_banner = 1; 65static char show_banner = 1;
69static char be_quiet = 0; 66static char be_quiet = 0;
70static char be_verbose = 0; 67static char be_verbose = 0;
68static char be_wewy_wewy_quiet = 0;
69static char be_semi_verbose = 0;
71static char *find_sym = NULL, *versioned_symname = NULL; 70static char *find_sym = NULL, *versioned_symname = NULL;
71static char *find_lib = NULL;
72static char *find_section = NULL;
72static char *out_format = NULL; 73static char *out_format = NULL;
74static char *search_path = NULL;
75static char fix_elf = 0;
76static char gmatch = 0;
77static char use_ldcache = 0;
78
79static char **qa_textrels = NULL;
80static char **qa_execstack = NULL;
81static char **qa_wx_load = NULL;
82
83int match_bits = 0;
84caddr_t ldcache = 0;
85size_t ldcache_size = 0;
86unsigned long setpax = 0UL;
87
88/* utility funcs */
89static char *xstrdup(const char *s)
90{
91 char *ret = strdup(s);
92 if (!ret) err("Could not strdup(): %s", strerror(errno));
93 return ret;
94}
95static void *xmalloc(size_t size)
96{
97 void *ret = malloc(size);
98 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
99 return ret;
100}
101static void *xrealloc(void *ptr, size_t size)
102{
103 void *ret = realloc(ptr, size);
104 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
105 return ret;
106}
107static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
108{
109 size_t new_len;
110
111 new_len = strlen(*dst) + strlen(src);
112 if (*curr_len <= new_len) {
113 *curr_len = new_len + (*curr_len / 2);
114 *dst = realloc(*dst, *curr_len);
115 if (!*dst)
116 err("could not realloc() %li bytes", (unsigned long)*curr_len);
117 }
118
119 if (n)
120 strncat(*dst, src, n);
121 else
122 strcat(*dst, src);
123}
124static inline void xchrcat(char **dst, const char append, size_t *curr_len)
125{
126 static char my_app[2];
127 my_app[0] = append;
128 my_app[1] = '\0';
129 xstrcat(dst, my_app, curr_len);
130}
131
132/* Match filename against entries in matchlist, return TRUE
133 * if the file is listed */
134static int file_matches_list(const char *filename, char **matchlist)
135{
136 char **file;
137 char *match;
138 char buf[__PAX_UTILS_PATH_MAX];
139
140 if (matchlist == NULL)
141 return 0;
142
143 for (file = matchlist; *file != NULL; file++) {
144 if (search_path) {
145 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
146 match = buf;
147 } else {
148 match = *file;
149 }
150 if (fnmatch(match, filename, 0) == 0)
151 return 1;
152 }
153 return 0;
154}
73 155
74 156
75 157
76/* sub-funcs for scanelf_file() */ 158/* sub-funcs for scanelf_file() */
159static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
160{
161 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
162#define GET_SYMTABS(B) \
163 if (elf->elf_class == ELFCLASS ## B) { \
164 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
165 /* debug sections */ \
166 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
167 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
168 /* runtime sections */ \
169 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
170 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
171 if (symtab && dynsym) { \
172 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
173 } else { \
174 *sym = (void*)(symtab ? symtab : dynsym); \
175 } \
176 if (strtab && dynstr) { \
177 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
178 } else { \
179 *tab = (void*)(strtab ? strtab : dynstr); \
180 } \
181 }
182 GET_SYMTABS(32)
183 GET_SYMTABS(64)
184}
185
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 186static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 187{
79 static char *paxflags; 188 static char ret[7];
189 unsigned long i, shown;
80 190
81 if (!show_pax) return NULL; 191 if (!show_pax) return NULL;
82 192
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; 193 shown = 0;
100 strcpy(ret, "--- ---"); 194 memset(&ret, 0, sizeof(ret));
101 195
102 if (elf->phdr) { 196 if (elf->phdr) {
103#define SHOW_STACK(B) \ 197#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 198 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 199 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 200 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 201 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 202 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; \ 203 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 204 if (fix_elf && setpax) { \
205 /* set the paxctl flags */ \
206 ESET(phdr[i].p_flags, setpax); \
207 } \
208 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 209 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 210 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 211 *found_pax = 1; \
120 ++shown; \ 212 ++shown; \
213 break; \
121 } \ 214 } \
122 } 215 }
123 SHOW_STACK(32) 216 SHOW_PAX(32)
124 SHOW_STACK(64) 217 SHOW_PAX(64)
218 }
219
220
221 if (fix_elf && setpax) {
222 /* set the chpax settings */
223 if (elf->elf_class == ELFCLASS32) {
224 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
225 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
226 } else {
227 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
228 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
125 } 229 }
230 }
126 231
127 if (be_quiet && !shown) 232 /* fall back to EI_PAX if no PT_PAX was found */
233 if (!*ret) {
234 static char *paxflags;
235 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
236 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
237 *found_pax = 1;
238 return (be_wewy_wewy_quiet ? NULL : paxflags);
239 }
240 strncpy(ret, paxflags, sizeof(ret));
241 }
242
243 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 244 return NULL;
129 else 245 else
130 return ret; 246 return ret;
131} 247}
248
249static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
250{
251 static char ret[12];
252 char *found;
253 unsigned long i, shown, multi_stack, multi_relro, multi_load;
254 int max_pt_load;
255
256 if (!show_phdr) return NULL;
257
258 memcpy(ret, "--- --- ---\0", 12);
259
260 shown = 0;
261 multi_stack = multi_relro = multi_load = 0;
262 max_pt_load = elf_max_pt_load(elf);
263
264#define NOTE_GNU_STACK ".note.GNU-stack"
265#define SHOW_PHDR(B) \
266 if (elf->elf_class == ELFCLASS ## B) { \
267 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
268 Elf ## B ## _Off offset; \
269 uint32_t flags, check_flags; \
270 if (elf->phdr != NULL) { \
271 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
272 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
273 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
274 if (multi_stack++) \
275 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
276 if (file_matches_list(elf->filename, qa_execstack)) \
277 continue; \
278 found = found_phdr; \
279 offset = 0; \
280 check_flags = PF_X; \
281 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
282 if (multi_relro++) \
283 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
284 found = found_relro; \
285 offset = 4; \
286 check_flags = PF_X; \
287 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
288 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
289 if (multi_load++ > max_pt_load) \
290 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
291 if (file_matches_list(elf->filename, qa_wx_load)) \
292 continue; \
293 found = found_load; \
294 offset = 8; \
295 check_flags = PF_W|PF_X; \
296 } else \
297 continue; \
298 flags = EGET(phdr[i].p_flags); \
299 if (be_quiet && ((flags & check_flags) != check_flags)) \
300 continue; \
301 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
302 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
303 ret[3] = ret[7] = '!'; \
304 flags = EGET(phdr[i].p_flags); \
305 } \
306 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
307 *found = 1; \
308 ++shown; \
309 } \
310 } else if (elf->shdr != NULL) { \
311 /* no program headers which means this is prob an object file */ \
312 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
313 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
314 char *str; \
315 if ((void*)strtbl > (void*)elf->data_end) \
316 goto skip_this_shdr##B; \
317 check_flags = SHF_WRITE|SHF_EXECINSTR; \
318 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
319 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
320 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
321 str = elf->data + offset; \
322 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
323 if (!strcmp(str, NOTE_GNU_STACK)) { \
324 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
325 flags = EGET(shdr[i].sh_flags); \
326 if (be_quiet && ((flags & check_flags) != check_flags)) \
327 continue; \
328 ++*found_phdr; \
329 shown = 1; \
330 if (flags & SHF_WRITE) ret[0] = 'W'; \
331 if (flags & SHF_ALLOC) ret[1] = 'A'; \
332 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
333 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
334 break; \
335 } \
336 } \
337 skip_this_shdr##B: \
338 if (!multi_stack) { \
339 *found_phdr = 1; \
340 shown = 1; \
341 memcpy(ret, "!WX", 3); \
342 } \
343 } \
344 }
345 SHOW_PHDR(32)
346 SHOW_PHDR(64)
347
348 if (be_wewy_wewy_quiet || (be_quiet && !shown))
349 return NULL;
350 else
351 return ret;
352}
353
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 354static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 355{
134 static char *ret = "TEXTREL"; 356 static const char *ret = "TEXTREL";
135 unsigned long i; 357 unsigned long i;
136 358
137 if (!show_textrel) return NULL; 359 if (!show_textrel && !show_textrels) return NULL;
360
361 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 362
139 if (elf->phdr) { 363 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 364#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 365 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 366 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 367 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 368 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 369 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 370 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 371 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
148 offset = EGET(phdr[i].p_offset); \ 372 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 373 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 374 dyn = DYN ## B (elf->data + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 375 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 376 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 377 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 378 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 379 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 380 } \
157 ++dyn; \ 381 ++dyn; \
158 } \ 382 } \
159 } } 383 } }
160 SHOW_TEXTREL(32) 384 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 385 SHOW_TEXTREL(64)
162 } 386 }
163 387
164 if (be_quiet) 388 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 389 return NULL;
166 else 390 else
167 return " - "; 391 return " - ";
168} 392}
393static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
394{
395 unsigned long s, r, rmax;
396 void *symtab_void, *strtab_void, *text_void;
397
398 if (!show_textrels) return NULL;
399
400 /* don't search for TEXTREL's if the ELF doesn't have any */
401 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
402 if (!*found_textrel) return NULL;
403
404 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
405 text_void = elf_findsecbyname(elf, ".text");
406
407 if (symtab_void && strtab_void && text_void && elf->shdr) {
408#define SHOW_TEXTRELS(B) \
409 if (elf->elf_class == ELFCLASS ## B) { \
410 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
411 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
412 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
413 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
414 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
415 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
416 uint ## B ## _t memsz = EGET(text->sh_size); \
417 Elf ## B ## _Rel *rel; \
418 Elf ## B ## _Rela *rela; \
419 /* search the section headers for relocations */ \
420 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
421 uint32_t sh_type = EGET(shdr[s].sh_type); \
422 if (sh_type == SHT_REL) { \
423 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
424 rela = NULL; \
425 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
426 } else if (sh_type == SHT_RELA) { \
427 rel = NULL; \
428 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
429 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
430 } else \
431 continue; \
432 /* now see if any of the relocs are in the .text */ \
433 for (r = 0; r < rmax; ++r) { \
434 unsigned long sym_max; \
435 Elf ## B ## _Addr offset_tmp; \
436 Elf ## B ## _Sym *func; \
437 Elf ## B ## _Sym *sym; \
438 Elf ## B ## _Addr r_offset; \
439 uint ## B ## _t r_info; \
440 if (sh_type == SHT_REL) { \
441 r_offset = EGET(rel[r].r_offset); \
442 r_info = EGET(rel[r].r_info); \
443 } else { \
444 r_offset = EGET(rela[r].r_offset); \
445 r_info = EGET(rela[r].r_info); \
446 } \
447 /* make sure this relocation is inside of the .text */ \
448 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
449 if (be_verbose <= 2) continue; \
450 } else \
451 *found_textrels = 1; \
452 /* locate this relocation symbol name */ \
453 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
454 if ((void*)sym > (void*)elf->data_end) { \
455 warn("%s: corrupt ELF symbol", elf->filename); \
456 continue; \
457 } \
458 sym_max = ELF ## B ## _R_SYM(r_info); \
459 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
460 sym += sym_max; \
461 else \
462 sym = NULL; \
463 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
464 /* show the raw details about this reloc */ \
465 printf(" %s: ", elf->base_filename); \
466 if (sym && sym->st_name) \
467 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
468 else \
469 printf("(memory/fake?)"); \
470 printf(" [0x%lX]", (unsigned long)r_offset); \
471 /* now try to find the closest symbol that this rel is probably in */ \
472 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
473 func = NULL; \
474 offset_tmp = 0; \
475 while (sym_max--) { \
476 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
477 func = sym; \
478 offset_tmp = EGET(sym->st_value); \
479 } \
480 ++sym; \
481 } \
482 printf(" in "); \
483 if (func && func->st_name) \
484 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
485 else \
486 printf("(NULL: fake?)"); \
487 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
488 } \
489 } }
490 SHOW_TEXTRELS(32)
491 SHOW_TEXTRELS(64)
492 }
493 if (!*found_textrels)
494 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
495
496 return NULL;
497}
498
499static void rpath_security_checks(elfobj *, char *, const char *);
500static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
501{
502 struct stat st;
503 switch (*item) {
504 case '/': break;
505 case '.':
506 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
507 break;
508 case ':':
509 case '\0':
510 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
511 break;
512 case '$':
513 if (fstat(elf->fd, &st) != -1)
514 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
515 warnf("Security problem with %s='%s' in %s with mode set of %o",
516 dt_type, item, elf->filename, st.st_mode & 07777);
517 break;
518 default:
519 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
520 break;
521 }
522}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 523static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 524{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 525 unsigned long i, s;
173 char *rpath, *runpath; 526 char *rpath, *runpath, **r;
174 void *strtbl_void; 527 void *strtbl_void;
175 528
176 if (!show_rpath) return; 529 if (!show_rpath) return;
177 530
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 531 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 537 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 538 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 539 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 540 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 541 Elf ## B ## _Off offset; \
542 Elf ## B ## _Xword word; \
543 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
545 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 546 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
191 offset = EGET(phdr[i].p_offset); \ 547 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
549 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 550 dyn = DYN ## B (elf->data + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 552 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 553 r = &rpath; \
554 } else if (word == DT_RUNPATH) { \
555 r = &runpath; \
556 } else { \
557 ++dyn; \
558 continue; \
559 } \
560 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 562 if (offset < (Elf ## B ## _Off)elf->len) { \
563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 564 *r = (char*)(elf->data + offset); \
565 /* cache the length in case we need to nuke this section later on */ \
566 if (fix_elf) \
567 offset = strlen(*r); \
568 /* If quiet, don't output paths in ld.so.conf */ \
569 if (be_quiet) { \
570 size_t len; \
571 char *start, *end; \
572 /* note that we only 'chop' off leading known paths. */ \
573 /* since *r is read-only memory, we can only move the ptr forward. */ \
574 start = *r; \
575 /* scan each path in : delimited list */ \
576 while (start) { \
577 rpath_security_checks(elf, start, get_elfdtype(word)); \
578 end = strchr(start, ':'); \
579 len = (end ? abs(end - start) : strlen(start)); \
580 if (use_ldcache) \
581 for (s = 0; ldpaths[s]; ++s) \
582 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
583 *r = end; \
584 /* corner case ... if RPATH reads "/usr/lib:", we want \
585 * to show ':' rather than '' */ \
586 if (end && end[1] != '\0') \
587 (*r)++; \
588 break; \
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
684static char *lookup_cache_lib(elfobj *, char *);
685
686#if defined(__GLIBC__) || defined(__UCLIBC__)
687
688static char *lookup_cache_lib(elfobj *elf, char *fname)
689{
690 int fd = 0;
691 char *strs;
692 static char buf[__PAX_UTILS_PATH_MAX] = "";
693 const char *cachefile = "/etc/ld.so.cache";
694 struct stat st;
695
696 typedef struct {
697 char magic[LDSO_CACHE_MAGIC_LEN];
698 char version[LDSO_CACHE_VER_LEN];
699 int nlibs;
700 } header_t;
701 header_t *header;
702
703 typedef struct {
704 int flags;
705 int sooffset;
706 int liboffset;
707 } libentry_t;
708 libentry_t *libent;
709
710 if (fname == NULL)
711 return NULL;
712
713 if (ldcache == 0) {
714 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
715 return NULL;
716
717 /* cache these values so we only map/unmap the cache file once */
718 ldcache_size = st.st_size;
719 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
720
721 close(fd);
722
723 if (ldcache == (caddr_t)-1) {
724 ldcache = 0;
725 return NULL;
726 }
727
728 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
729 return NULL;
730 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
731 return NULL;
732 }
733
734 header = (header_t *) ldcache;
735 libent = (libentry_t *) (ldcache + sizeof(header_t));
736 strs = (char *) &libent[header->nlibs];
737
738 for (fd = 0; fd < header->nlibs; fd++) {
739 /* this should be more fine grained, but for now we assume that
740 * diff arches will not be cached together. and we ignore the
741 * the different multilib mips cases. */
742 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
743 continue;
744 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
745 continue;
746
747 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
748 continue;
749 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
750 }
751 return buf;
752}
753
754#else
755#warning Cache support not implemented for your target
756static char *lookup_cache_lib(elfobj *elf, char *fname)
757{
758 return NULL;
759}
760#endif
761
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 762static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 763{
233 unsigned long i; 764 unsigned long i;
234 char *needed; 765 char *needed;
235 void *strtbl_void; 766 void *strtbl_void;
767 char *p;
236 768
237 if (!show_needed) return; 769 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
238 770
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 771 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 772
241 if (elf->phdr && strtbl_void) { 773 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 774#define SHOW_NEEDED(B) \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 784 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
253 dyn = DYN ## B (elf->data + offset); \ 785 dyn = DYN ## B (elf->data + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 786 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 787 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 788 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 789 if (offset >= (Elf ## B ## _Off)elf->len) { \
790 ++dyn; \
791 continue; \
792 } \
258 needed = (char*)(elf->data + offset); \ 793 needed = (char*)(elf->data + offset); \
794 if (op == 0) { \
795 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 796 if (*found_needed) xchrcat(ret, ',', ret_len); \
797 if (use_ldcache) \
798 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
799 needed = p; \
260 xstrcat(ret, needed, ret_len); \ 800 xstrcat(ret, needed, ret_len); \
801 } \
261 *found_needed = 1; \ 802 *found_needed = 1; \
803 } else { \
804 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
805 *found_lib = 1; \
806 return (be_wewy_wewy_quiet ? NULL : needed); \
807 } \
808 } \
262 } \ 809 } \
263 ++dyn; \ 810 ++dyn; \
264 } \ 811 } \
265 } } 812 } }
266 SHOW_NEEDED(32) 813 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 814 SHOW_NEEDED(64)
815 if (op == 0 && !*found_needed && be_verbose)
816 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 817 }
818
819 return NULL;
269} 820}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 821static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 822{
272 void *strtbl_void; 823 void *strtbl_void;
273 824
278 if (strtbl_void) { 829 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 830#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 831 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 832 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 833 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 834 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 835 }
285 SHOW_INTERP(32) 836 SHOW_INTERP(32)
286 SHOW_INTERP(64) 837 SHOW_INTERP(64)
287 } 838 }
288 return NULL; 839 return NULL;
289} 840}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 841static char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 842{
292 unsigned long i; 843 unsigned long i;
844 struct stat s;
845 char dynamic = 0;
846
847 if (!show_bind) return NULL;
848 if (!elf->phdr) return NULL;
849
850#define SHOW_BIND(B) \
851 if (elf->elf_class == ELFCLASS ## B) { \
852 Elf ## B ## _Dyn *dyn; \
853 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
854 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
855 Elf ## B ## _Off offset; \
856 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
857 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
858 dynamic = 1; \
859 offset = EGET(phdr[i].p_offset); \
860 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
861 dyn = DYN ## B (elf->data + offset); \
862 while (EGET(dyn->d_tag) != DT_NULL) { \
863 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
864 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
865 { \
866 if (be_quiet) return NULL; \
867 *found_bind = 1; \
868 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
869 } \
870 ++dyn; \
871 } \
872 } \
873 }
874 SHOW_BIND(32)
875 SHOW_BIND(64)
876
877 if (be_wewy_wewy_quiet) return NULL;
878
879 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
880 return NULL;
881 } else {
882 *found_bind = 1;
883 return (char *) (dynamic ? "LAZY" : "STATIC");
884 }
885}
886static char *scanelf_file_soname(elfobj *elf, char *found_soname)
887{
888 unsigned long i;
889 char *soname;
890 void *strtbl_void;
891
892 if (!show_soname) return NULL;
893
894 strtbl_void = elf_findsecbyname(elf, ".dynstr");
895
896 if (elf->phdr && strtbl_void) {
897#define SHOW_SONAME(B) \
898 if (elf->elf_class == ELFCLASS ## B) { \
899 Elf ## B ## _Dyn *dyn; \
900 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
901 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
902 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
903 Elf ## B ## _Off offset; \
904 /* only look for soname in shared objects */ \
905 if (ehdr->e_type != ET_DYN) \
906 return NULL; \
907 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
908 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
909 offset = EGET(phdr[i].p_offset); \
910 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
911 dyn = DYN ## B (elf->data + offset); \
912 while (EGET(dyn->d_tag) != DT_NULL) { \
913 if (EGET(dyn->d_tag) == DT_SONAME) { \
914 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
915 if (offset >= (Elf ## B ## _Off)elf->len) { \
916 ++dyn; \
917 continue; \
918 } \
919 soname = (char*)(elf->data + offset); \
920 *found_soname = 1; \
921 return (be_wewy_wewy_quiet ? NULL : soname); \
922 } \
923 ++dyn; \
924 } \
925 } }
926 SHOW_SONAME(32)
927 SHOW_SONAME(64)
928 }
929
930 return NULL;
931}
932static char *scanelf_file_sym(elfobj *elf, char *found_sym)
933{
934 unsigned long i;
935 char *ret;
293 void *symtab_void, *strtab_void; 936 void *symtab_void, *strtab_void;
294 937
295 if (!find_sym) return NULL; 938 if (!find_sym) return NULL;
939 ret = find_sym;
296 940
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 941 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 942
300 if (symtab_void && strtab_void) { 943 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 944#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 945 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 946 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 947 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 948 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 949 unsigned long cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 950 char *symname; \
951 if (cnt) \
952 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 953 for (i = 0; i < cnt; ++i) { \
309 if (sym->st_name) { \ 954 if (sym->st_name) { \
955 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 956 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
957 if ((void*)symname > (void*)elf->data_end) { \
958 warnf("%s: corrupt ELF symbols", elf->filename); \
959 ++sym; \
960 continue; \
961 } \
962 /* debug display ... show all symbols and some extra info */ \
311 if (*find_sym == '*') { \ 963 if (*ret == '*') { \
312 printf("%s(%s) %5lX %15s %s\n", \ 964 printf("%s(%s) %5lX %15s %s\n", \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 965 ((*found_sym == 0) ? "\n\t" : "\t"), \
314 (char *)basename(filename), \ 966 elf->base_filename, \
315 (long)sym->st_size, \ 967 (unsigned long)sym->st_size, \
316 (char *)get_elfstttype(sym->st_info), \ 968 get_elfstttype(sym->st_info), \
317 symname); \ 969 symname); \
318 *found_sym = 1; \ 970 *found_sym = 1; \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 971 } else { \
320 (strcmp(symname, versioned_symname) == 0)) \ 972 /* allow the user to specify a comma delimited list of symbols to search for */ \
973 char *this_sym, *next_sym; \
974 this_sym = ret; \
975 do { \
976 next_sym = strchr(this_sym, ','); \
977 if (next_sym == NULL) \
978 next_sym = this_sym + strlen(this_sym); \
979 /* do we want a defined symbol ? */ \
980 if (*this_sym == '+') { \
981 if (sym->st_shndx == SHN_UNDEF) \
982 goto skip_this_sym##B; \
983 ++this_sym; \
984 /* do we want an undefined symbol ? */ \
985 } else if (*this_sym == '-') { \
986 if (sym->st_shndx != SHN_UNDEF) \
987 goto skip_this_sym##B; \
988 ++this_sym; \
989 } \
990 /* ok, lets compare the name now */ \
991 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
992 (strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) { \
993 if (be_semi_verbose) { \
994 char buf[126]; \
995 snprintf(buf, sizeof(buf), "%lX %s %s", \
996 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
997 ret = buf; \
998 } else \
999 ret = this_sym; \
321 (*found_sym)++; \ 1000 (*found_sym)++; \
1001 goto break_out; \
1002 } \
1003 skip_this_sym##B: this_sym = next_sym + 1; \
1004 } while (*next_sym != '\0'); \
1005 } \
322 } \ 1006 } \
323 ++sym; \ 1007 ++sym; \
324 } } 1008 } }
325 FIND_SYM(32) 1009 FIND_SYM(32)
326 FIND_SYM(64) 1010 FIND_SYM(64)
327 } 1011 }
1012
1013break_out:
1014 if (be_wewy_wewy_quiet) return NULL;
1015
328 if (*find_sym != '*' && *found_sym) 1016 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1017 return ret;
330 if (be_quiet) 1018 if (be_quiet)
331 return NULL; 1019 return NULL;
332 else 1020 else
333 return " - "; 1021 return (char *)" - ";
334} 1022}
1023
1024
1025static char *scanelf_file_sections(elfobj *elf, char *found_section)
1026{
1027 if (!find_section)
1028 return NULL;
1029
1030#define FIND_SECTION(B) \
1031 if (elf->elf_class == ELFCLASS ## B) { \
1032 int invert; \
1033 Elf ## B ## _Shdr *section; \
1034 invert = (*find_section == '!' ? 1 : 0); \
1035 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1036 if ((section == NULL && invert) || (section != NULL && !invert)) \
1037 *found_section = 1; \
1038 }
1039 FIND_SECTION(32)
1040 FIND_SECTION(64)
1041
1042 if (be_wewy_wewy_quiet)
1043 return NULL;
1044
1045 if (*found_section)
1046 return find_section;
1047
1048 if (be_quiet)
1049 return NULL;
1050 else
1051 return (char *)" - ";
1052}
1053
335/* scan an elf file and show all the fun stuff */ 1054/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1055#define prints(str) write(fileno(stdout), str, strlen(str))
337static void scanelf_file(const char *filename) 1056static int scanelf_elfobj(elfobj *elf)
338{ 1057{
339 unsigned long i; 1058 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1059 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1060 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1061 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1062 static char *out_buffer = NULL;
346 static size_t out_len; 1063 static size_t out_len;
1064
1065 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1066 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1067 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1068
1069 if (be_verbose > 2)
1070 printf("%s: scanning file {%s,%s}\n", elf->filename,
1071 get_elfeitype(EI_CLASS, elf->elf_class),
1072 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1073 else if (be_verbose > 1)
1074 printf("%s: scanning file\n", elf->filename);
1075
1076 /* init output buffer */
1077 if (!out_buffer) {
1078 out_len = sizeof(char) * 80;
1079 out_buffer = (char*)xmalloc(out_len);
1080 }
1081 *out_buffer = '\0';
1082
1083 /* show the header */
1084 if (!be_quiet && show_banner) {
1085 for (i = 0; out_format[i]; ++i) {
1086 if (!IS_MODIFIER(out_format[i])) continue;
1087
1088 switch (out_format[++i]) {
1089 case '+': break;
1090 case '%': break;
1091 case '#': break;
1092 case 'F':
1093 case 'p':
1094 case 'f': prints("FILE "); found_file = 1; break;
1095 case 'o': prints(" TYPE "); break;
1096 case 'x': prints(" PAX "); break;
1097 case 'e': prints("STK/REL/PTL "); break;
1098 case 't': prints("TEXTREL "); break;
1099 case 'r': prints("RPATH "); break;
1100 case 'n': prints("NEEDED "); break;
1101 case 'i': prints("INTERP "); break;
1102 case 'b': prints("BIND "); break;
1103 case 'S': prints("SONAME "); break;
1104 case 's': prints("SYM "); break;
1105 case 'N': prints("LIB "); break;
1106 case 'T': prints("TEXTRELS "); break;
1107 case 'k': prints("SECTION "); break;
1108 default: warnf("'%c' has no title ?", out_format[i]);
1109 }
1110 }
1111 if (!found_file) prints("FILE ");
1112 prints("\n");
1113 found_file = 0;
1114 show_banner = 0;
1115 }
1116
1117 /* dump all the good stuff */
1118 for (i = 0; out_format[i]; ++i) {
1119 const char *out;
1120 const char *tmp;
1121
1122 if (!IS_MODIFIER(out_format[i])) {
1123 xchrcat(&out_buffer, out_format[i], &out_len);
1124 continue;
1125 }
1126
1127 out = NULL;
1128 be_wewy_wewy_quiet = (out_format[i] == '#');
1129 be_semi_verbose = (out_format[i] == '+');
1130 switch (out_format[++i]) {
1131 case '+':
1132 case '%':
1133 case '#':
1134 xchrcat(&out_buffer, out_format[i], &out_len); break;
1135 case 'F':
1136 found_file = 1;
1137 if (be_wewy_wewy_quiet) break;
1138 xstrcat(&out_buffer, elf->filename, &out_len);
1139 break;
1140 case 'p':
1141 found_file = 1;
1142 if (be_wewy_wewy_quiet) break;
1143 tmp = elf->filename;
1144 if (search_path) {
1145 ssize_t len_search = strlen(search_path);
1146 ssize_t len_file = strlen(elf->filename);
1147 if (!strncmp(elf->filename, search_path, len_search) && \
1148 len_file > len_search)
1149 tmp += len_search;
1150 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1151 }
1152 xstrcat(&out_buffer, tmp, &out_len);
1153 break;
1154 case 'f':
1155 found_file = 1;
1156 if (be_wewy_wewy_quiet) break;
1157 tmp = strrchr(elf->filename, '/');
1158 tmp = (tmp == NULL ? elf->filename : tmp+1);
1159 xstrcat(&out_buffer, tmp, &out_len);
1160 break;
1161 case 'o': out = get_elfetype(elf); break;
1162 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1163 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1164 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1165 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1166 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1167 case 'n':
1168 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1169 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1170 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1171 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1172 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1173 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1174 default: warnf("'%c' has no scan code?", out_format[i]);
1175 }
1176 if (out) {
1177 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1178 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1179 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1180 else
1181 xstrcat(&out_buffer, out, &out_len);
1182 }
1183 }
1184
1185#define FOUND_SOMETHING() \
1186 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1187 found_rpath || found_needed || found_interp || found_bind || \
1188 found_soname || found_sym || found_lib || found_textrels || found_section )
1189
1190 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1191 xchrcat(&out_buffer, ' ', &out_len);
1192 xstrcat(&out_buffer, elf->filename, &out_len);
1193 }
1194 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1195 puts(out_buffer);
1196 fflush(stdout);
1197 }
1198
1199 return 0;
1200}
1201
1202/* scan a single elf */
1203static int scanelf_elf(const char *filename, int fd, size_t len)
1204{
1205 int ret = 1;
1206 elfobj *elf;
1207
1208 /* verify this is real ELF */
1209 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1210 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1211 return ret;
1212 }
1213 switch (match_bits) {
1214 case 32:
1215 if (elf->elf_class != ELFCLASS32)
1216 goto label_done;
1217 break;
1218 case 64:
1219 if (elf->elf_class != ELFCLASS64)
1220 goto label_done;
1221 break;
1222 default: break;
1223 }
1224 if (strlen(match_etypes)) {
1225 char sbuf[126];
1226 strncpy(sbuf, match_etypes, sizeof(sbuf));
1227 if (strchr(match_etypes, ',') != NULL) {
1228 char *p;
1229 while((p = strrchr(sbuf, ',')) != NULL) {
1230 *p = 0;
1231 if (etype_lookup(p+1) == get_etype(elf))
1232 goto label_ret;
1233 }
1234 }
1235 if (etype_lookup(sbuf) != get_etype(elf))
1236 goto label_done;
1237 }
1238
1239label_ret:
1240 ret = scanelf_elfobj(elf);
1241
1242label_done:
1243 unreadelf(elf);
1244 return ret;
1245}
1246
1247/* scan an archive of elfs */
1248static int scanelf_archive(const char *filename, int fd, size_t len)
1249{
1250 archive_handle *ar;
1251 archive_member *m;
1252 char *ar_buffer;
1253 elfobj *elf;
1254
1255 ar = ar_open_fd(filename, fd);
1256 if (ar == NULL)
1257 return 1;
1258
1259 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1260 while ((m=ar_next(ar)) != NULL) {
1261 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1262 if (elf) {
1263 scanelf_elfobj(elf);
1264 unreadelf(elf);
1265 }
1266 }
1267 munmap(ar_buffer, len);
1268
1269 return 0;
1270}
1271/* scan a file which may be an elf or an archive or some other magical beast */
1272static void scanelf_file(const char *filename)
1273{
1274 struct stat st;
1275 int fd;
347 1276
348 /* make sure 'filename' exists */ 1277 /* make sure 'filename' exists */
349 if (lstat(filename, &st) == -1) { 1278 if (lstat(filename, &st) == -1) {
350 if (be_verbose > 2) printf("%s: does not exist\n", filename); 1279 if (be_verbose > 2) printf("%s: does not exist\n", filename);
351 return; 1280 return;
352 } 1281 }
1282
353 /* always handle regular files and handle symlinked files if no -y */ 1283 /* 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))) { 1284 if (S_ISLNK(st.st_mode)) {
1285 if (!scan_symlink) return;
1286 stat(filename, &st);
1287 }
1288 if (!S_ISREG(st.st_mode)) {
355 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1289 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
356 return; 1290 return;
357 } 1291 }
358 1292
359 found_pax = found_stack = found_relro = found_textrel = \ 1293 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
360 found_rpath = found_needed = found_interp = found_sym = \
361 found_file = 0;
362
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; 1294 return;
367 }
368 1295
369 if (be_verbose > 1) 1296 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
370 printf("%s: scanning file {%s,%s}\n", filename, 1297 /* if it isn't an ELF, maybe it's an .a archive */
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1298 scanelf_archive(filename, fd, st.st_size);
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose)
374 printf("%s: scanning file\n", filename);
375 1299
376 /* init output buffer */ 1300 close(fd);
377 if (!out_buffer) {
378 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len);
380 }
381 *out_buffer = '\0';
382
383 /* show the header */
384 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue;
387
388 switch (out_format[++i]) {
389 case '%': break;
390 case 'F': prints("FILE "); break;
391 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break;
394 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break;
396 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break;
398 case 's': prints("SYM "); break;
399 }
400 }
401 prints("\n");
402 show_banner = 0;
403 }
404
405 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) {
407 const char *out;
408
409 /* make sure we trim leading spaces in quiet mode */
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
411 *out_buffer = '\0';
412
413 if (out_format[i] != '%') {
414 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue;
416 }
417
418 out = NULL;
419 switch (out_format[++i]) {
420 case '%': xchrcat(&out_buffer, '%', &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
422 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
425 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
426 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
428 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
430 }
431 if (out) xstrcat(&out_buffer, out, &out_len);
432 }
433
434 if (!found_file) {
435 if (!be_quiet || found_pax || found_stack || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym)
437 xstrcat(&out_buffer, filename, &out_len);
438 }
439 if (!(be_quiet && xemptybuffer(out_buffer)))
440 puts(out_buffer);
441
442 unreadelf(elf);
443} 1301}
444 1302
445/* scan a directory for ET_EXEC files and print when we find one */ 1303/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1304static void scanelf_dir(const char *path)
447{ 1305{
448 register DIR *dir; 1306 register DIR *dir;
449 register struct dirent *dentry; 1307 register struct dirent *dentry;
450 struct stat st_top, st; 1308 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1309 char buf[__PAX_UTILS_PATH_MAX];
452 size_t pathlen = 0, len = 0; 1310 size_t pathlen = 0, len = 0;
453 1311
454 /* make sure path exists */ 1312 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1313 if (lstat(path, &st_top) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1314 if (be_verbose > 2) printf("%s: does not exist\n", path);
466 /* now scan the dir looking for fun stuff */ 1324 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1325 if ((dir = opendir(path)) == NULL) {
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1326 warnf("could not opendir %s: %s", path, strerror(errno));
469 return; 1327 return;
470 } 1328 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1329 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1330
473 pathlen = strlen(path); 1331 pathlen = strlen(path);
474 while ((dentry = readdir(dir))) { 1332 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1333 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1334 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1335 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
478 if (len >= sizeof(buf)) { 1336 if (len >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1337 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1338 (unsigned long)len, (unsigned long)sizeof(buf));
480 continue; 1339 continue;
481 } 1340 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1341 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
483 if (lstat(buf, &st) != -1) { 1342 if (lstat(buf, &st) != -1) {
484 if (S_ISREG(st.st_mode)) 1343 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1344 scanelf_file(buf);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1345 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1346 if (dir_crossmount || (st_top.st_dev == st.st_dev))
490 } 1349 }
491 } 1350 }
492 closedir(dir); 1351 closedir(dir);
493} 1352}
494 1353
1354static int scanelf_from_file(const char *filename)
1355{
1356 FILE *fp = NULL;
1357 char *p;
1358 char path[__PAX_UTILS_PATH_MAX];
1359
1360 if (strcmp(filename, "-") == 0)
1361 fp = stdin;
1362 else if ((fp = fopen(filename, "r")) == NULL)
1363 return 1;
1364
1365 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1366 if ((p = strchr(path, '\n')) != NULL)
1367 *p = 0;
1368 search_path = path;
1369 scanelf_dir(path);
1370 }
1371 if (fp != stdin)
1372 fclose(fp);
1373 return 0;
1374}
1375
1376#if defined(__GLIBC__) || defined(__UCLIBC__)
1377
1378static int load_ld_cache_config(int i, const char *fname)
1379{
1380 FILE *fp = NULL;
1381 char *p;
1382 char path[__PAX_UTILS_PATH_MAX];
1383
1384 if (i + 1 == ARRAY_SIZE(ldpaths))
1385 return i;
1386
1387 if ((fp = fopen(fname, "r")) == NULL)
1388 return i;
1389
1390 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1391 if ((p = strrchr(path, '\r')) != NULL)
1392 *p = 0;
1393 if ((p = strchr(path, '\n')) != NULL)
1394 *p = 0;
1395 // recursive includes of the same file will make this segfault.
1396 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1397 glob64_t gl;
1398 size_t x;
1399 char gpath[__PAX_UTILS_PATH_MAX];
1400
1401 memset(gpath, 0, sizeof(gpath));
1402
1403 if (path[8] != '/')
1404 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1405 else
1406 strncpy(gpath, &path[8], sizeof(gpath));
1407
1408 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1409 for (x = 0; x < gl.gl_pathc; ++x) {
1410 /* try to avoid direct loops */
1411 if (strcmp(gl.gl_pathv[x], fname) == 0)
1412 continue;
1413 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1414 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1415 globfree64(&gl);
1416 return i;
1417 }
1418 }
1419 globfree64 (&gl);
1420 continue;
1421 } else
1422 abort();
1423 }
1424 if (*path != '/')
1425 continue;
1426
1427 ldpaths[i++] = xstrdup(path);
1428
1429 if (i + 1 == ARRAY_SIZE(ldpaths))
1430 break;
1431 }
1432 ldpaths[i] = NULL;
1433
1434 fclose(fp);
1435 return i;
1436}
1437
1438#elif defined(__FreeBSD__) || (__DragonFly__)
1439
1440static int load_ld_cache_config(int i, const char *fname)
1441{
1442 FILE *fp = NULL;
1443 char *b = NULL, *p;
1444 struct elfhints_hdr hdr;
1445
1446 if (i + 1 == ARRAY_SIZE(ldpaths))
1447 return i;
1448
1449 if ((fp = fopen(fname, "r")) == NULL)
1450 return i;
1451
1452 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1453 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1454 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1455 {
1456 fclose(fp);
1457 return i;
1458 }
1459
1460 b = (char*)malloc(hdr.dirlistlen+1);
1461 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1462 fclose(fp);
1463 free(b);
1464 return i;
1465 }
1466
1467 while ((p = strsep(&b, ":"))) {
1468 if (*p == '\0') continue;
1469 ldpaths[i++] = xstrdup(p);
1470
1471 if (i + 1 == ARRAY_SIZE(ldpaths))
1472 break;
1473 }
1474 ldpaths[i] = NULL;
1475
1476 free(b);
1477 fclose(fp);
1478 return i;
1479}
1480
1481#else
1482
1483#warning Cache config support not implemented for your target
1484static int load_ld_cache_config(int i, const char *fname)
1485{
1486 memset(ldpaths, 0x00, sizeof(ldpaths));
1487}
1488
1489#endif
1490
495/* scan /etc/ld.so.conf for paths */ 1491/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1492static void scanelf_ldpath()
497{ 1493{
498 char scan_l, scan_ul, scan_ull; 1494 char scan_l, scan_ul, scan_ull;
499 char *path, *p; 1495 int i = 0;
500 FILE *fp;
501 1496
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1497 if (!ldpaths[0])
503 err("Unable to open ld.so.conf: %s", strerror(errno)); 1498 err("Unable to load any paths from ld.so.conf");
504 1499
505 scan_l = scan_ul = scan_ull = 0; 1500 scan_l = scan_ul = scan_ull = 0;
506 1501
507 path = (char*)xmalloc(_POSIX_PATH_MAX); 1502 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; 1503 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
515 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1504 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
516 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1505 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
517 scanelf_dir(path); 1506 scanelf_dir(ldpaths[i]);
1507 ++i;
518 } 1508 }
519 free(path);
520 fclose(fp);
521 1509
522 if (!scan_l) scanelf_dir("/lib"); 1510 if (!scan_l) scanelf_dir("/lib");
523 if (!scan_ul) scanelf_dir("/usr/lib"); 1511 if (!scan_ul) scanelf_dir("/usr/lib");
524 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1512 if (!scan_ull) scanelf_dir("/usr/local/lib");
525} 1513}
540 } 1528 }
541 1529
542 free(path); 1530 free(path);
543} 1531}
544 1532
545
546
547/* usage / invocation handling functions */ 1533/* usage / invocation handling functions */
548#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 1534#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
549#define a_argument required_argument 1535#define a_argument required_argument
550static struct option const long_opts[] = { 1536static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1537 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1538 {"ldpath", no_argument, NULL, 'l'},
553 {"recursive", no_argument, NULL, 'R'}, 1539 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1540 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1541 {"symlink", no_argument, NULL, 'y'},
1542 {"archives", no_argument, NULL, 'A'},
1543 {"ldcache", no_argument, NULL, 'L'},
1544 {"fix", no_argument, NULL, 'X'},
1545 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1546 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1547 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1548 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1549 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1550 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1551 {"interp", no_argument, NULL, 'i'},
1552 {"bind", no_argument, NULL, 'b'},
1553 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1554 {"symbol", a_argument, NULL, 's'},
1555 {"section", a_argument, NULL, 'k'},
1556 {"lib", a_argument, NULL, 'N'},
1557 {"gmatch", no_argument, NULL, 'g'},
1558 {"textrels", no_argument, NULL, 'T'},
1559 {"etype", a_argument, NULL, 'E'},
1560 {"bits", a_argument, NULL, 'M'},
563 {"all", no_argument, NULL, 'a'}, 1561 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1562 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1563 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1564 {"format", a_argument, NULL, 'F'},
1565 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1566 {"file", a_argument, NULL, 'o'},
568 {"nobanner", no_argument, NULL, 'B'}, 1567 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1568 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1569 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1570 {NULL, no_argument, NULL, 0x0}
572}; 1571};
1572
573static char *opts_help[] = { 1573static const char *opts_help[] = {
574 "Scan all directories in PATH environment", 1574 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1575 "Scan all directories in /etc/ld.so.conf",
576 "Scan directories recursively", 1576 "Scan directories recursively",
577 "Don't recursively cross mount points", 1577 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1578 "Don't scan symlinks",
1579 "Scan archives (.a files)",
1580 "Utilize ld.so.cache information (use with -r/-n)",
1581 "Try and 'fix' bad things (use with -r/-e)",
1582 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 1583 "Print PaX markings",
580 "Print GNU_STACK markings", 1584 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 1585 "Print TEXTREL information",
582 "Print RPATH information", 1586 "Print RPATH information",
583 "Print NEEDED information", 1587 "Print NEEDED information",
584 "Print INTERP information", 1588 "Print INTERP information",
1589 "Print BIND information",
1590 "Print SONAME information",
585 "Find a specified symbol", 1591 "Find a specified symbol",
1592 "Find a specified section",
1593 "Find a specified library",
1594 "Use strncmp to match libraries. (use with -N)",
1595 "Locate cause of TEXTREL",
1596 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1597 "Print only ELF files matching numeric bits",
586 "Print all scanned info (-x -e -t -r)\n", 1598 "Print all scanned info (-x -e -t -r -b)\n",
587 "Only output 'bad' things", 1599 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 1600 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 1601 "Use specified format for output",
1602 "Read input stream from a filename",
590 "Write output stream to a filename", 1603 "Write output stream to a filename",
591 "Don't display the header", 1604 "Don't display the header",
592 "Print this help and exit", 1605 "Print this help and exit",
593 "Print version and exit", 1606 "Print version and exit",
594 NULL 1607 NULL
596 1609
597/* display usage and exit */ 1610/* display usage and exit */
598static void usage(int status) 1611static void usage(int status)
599{ 1612{
600 unsigned long i; 1613 unsigned long i;
601 printf(" Scan ELF binaries for stuff\n\n" 1614 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1615 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 1616 printf("Options: -[%s]\n", PARSE_FLAGS);
604 for (i = 0; long_opts[i].name; ++i) 1617 for (i = 0; long_opts[i].name; ++i)
605 if (long_opts[i].has_arg == no_argument) 1618 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1619 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
607 long_opts[i].name, opts_help[i]); 1620 long_opts[i].name, opts_help[i]);
608 else 1621 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1622 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
610 long_opts[i].name, opts_help[i]); 1623 long_opts[i].name, opts_help[i]);
1624
1625 if (status != EXIT_SUCCESS)
1626 exit(status);
1627
1628 puts("\nThe format modifiers for the -F option are:");
1629 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1630 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1631 puts(" i INTERP \tb BIND \ts symbol");
1632 puts(" N library \to Type \tT TEXTRELs");
1633 puts(" S SONAME \tk section");
1634 puts(" p filename (with search path removed)");
1635 puts(" f filename (short name/basename)");
1636 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1637
1638 puts("\nELF Etypes:");
1639 print_etypes(stdout);
1640
611 exit(status); 1641 exit(status);
612} 1642}
613 1643
614/* parse command line arguments and preform needed actions */ 1644/* parse command line arguments and preform needed actions */
615static void parseargs(int argc, char *argv[]) 1645static void parseargs(int argc, char *argv[])
616{ 1646{
617 int flag; 1647 int i;
1648 const char *from_file = NULL;
618 1649
619 opterr = 0; 1650 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1651 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 1652 switch (i) {
622 1653
623 case 'V': 1654 case 'V':
624 printf("%s compiled %s\n%s\n" 1655 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1656 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 1657 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 1658 exit(EXIT_SUCCESS);
628 break; 1659 break;
629 case 'h': usage(EXIT_SUCCESS); break; 1660 case 'h': usage(EXIT_SUCCESS); break;
630 1661 case 'f':
1662 if (from_file) warn("You prob don't want to specify -f twice");
1663 from_file = optarg;
1664 break;
1665 case 'E':
1666 strncpy(match_etypes, optarg, sizeof(match_etypes));
1667 break;
1668 case 'M':
1669 match_bits = atoi(optarg);
1670 break;
631 case 'o': { 1671 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 1672 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL)
635 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1673 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 1674 break;
638 } 1675 }
639 1676 case 'k':
1677 if (find_section) warn("You prob don't want to specify -k twice");
1678 find_section = optarg;
1679 break;
640 case 's': { 1680 case 's': {
641 size_t len; 1681 if (find_sym) warn("You prob don't want to specify -s twice");
642 find_sym = xstrdup(optarg); 1682 find_sym = optarg;
643 len = strlen(find_sym) + 1;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1683 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
645 sprintf(versioned_symname, "%s@", find_sym); 1684 sprintf(versioned_symname, "%s@", find_sym);
646 break; 1685 break;
647 } 1686 }
1687 case 'N': {
1688 if (find_lib) warn("You prob don't want to specify -N twice");
1689 find_lib = optarg;
1690 break;
1691 }
648 1692
649 case 'F': { 1693 case 'F': {
1694 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 1695 out_format = optarg;
1696 break;
1697 }
1698 case 'z': {
1699 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1700 size_t x;
1701
1702 for (x = 0 ; x < strlen(optarg); x++) {
1703 switch(optarg[x]) {
1704 case 'p':
1705 case 'P':
1706 do_state(optarg[x], PAGEEXEC);
651 break; 1707 break;
1708 case 's':
1709 case 'S':
1710 do_state(optarg[x], SEGMEXEC);
1711 break;
1712 case 'm':
1713 case 'M':
1714 do_state(optarg[x], MPROTECT);
1715 break;
1716 case 'e':
1717 case 'E':
1718 do_state(optarg[x], EMUTRAMP);
1719 break;
1720 case 'r':
1721 case 'R':
1722 do_state(optarg[x], RANDMMAP);
1723 break;
1724 case 'x':
1725 case 'X':
1726 do_state(optarg[x], RANDEXEC);
1727 break;
1728 default:
1729 break;
1730 }
652 } 1731 }
653 1732 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1733 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1734 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1735 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1736 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1737 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1738 setpax = flags;
1739 break;
1740 }
1741 case 'g': gmatch = 1; break;
1742 case 'L': use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 1743 case 'y': scan_symlink = 0; break;
1744 case 'A': scan_archives = 1; break;
655 case 'B': show_banner = 0; break; 1745 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 1746 case 'l': scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 1747 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 1748 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 1749 case 'm': dir_crossmount = 0; break;
1750 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 1751 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 1752 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 1753 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 1754 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 1755 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 1756 case 'i': show_interp = 1; break;
1757 case 'b': show_bind = 1; break;
1758 case 'S': show_soname = 1; break;
1759 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 1760 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1761 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; 1762 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
669 1763
670 case ':': 1764 case ':':
671 warn("Option missing parameter\n"); 1765 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 1766 case '?':
675 warn("Unknown option\n"); 1767 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 1768 default:
679 err("Unhandled option '%c'", flag); 1769 err("Unhandled option '%c'; please report this", i);
680 break;
681 }
682 } 1770 }
683 1771 }
684 if (be_quiet && be_verbose)
685 err("You can be quiet or you can be verbose, not both, stupid");
686 1772
687 /* let the format option override all other options */ 1773 /* let the format option override all other options */
688 if (out_format) { 1774 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1775 show_pax = show_phdr = show_textrel = show_rpath = \
1776 show_needed = show_interp = show_bind = show_soname = \
1777 show_textrels = 0;
690 for (flag=0; out_format[flag]; ++flag) { 1778 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 1779 if (!IS_MODIFIER(out_format[i])) continue;
692 1780
693 switch (out_format[++flag]) { 1781 switch (out_format[++i]) {
1782 case '+': break;
694 case '%': break; 1783 case '%': break;
1784 case '#': break;
695 case 'F': break; 1785 case 'F': break;
1786 case 'p': break;
1787 case 'f': break;
1788 case 'k': break;
696 case 's': break; 1789 case 's': break;
1790 case 'N': break;
697 case 'o': break; 1791 case 'o': break;
698 case 'x': show_pax = 1; break; 1792 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 1793 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 1794 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 1795 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 1796 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 1797 case 'i': show_interp = 1; break;
1798 case 'b': show_bind = 1; break;
1799 case 'S': show_soname = 1; break;
1800 case 'T': show_textrels = 1; break;
704 default: 1801 default:
705 err("Invalid format specifier '%c' (byte %i)", 1802 err("Invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 1803 out_format[i], i+1);
707 } 1804 }
708 } 1805 }
709 1806
710 /* construct our default format */ 1807 /* construct our default format */
711 } else { 1808 } else {
712 size_t fmt_len = 30; 1809 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1810 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1811 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1812 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1813 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1814 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1815 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1816 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1817 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1818 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1819 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1820 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1821 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1822 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1823 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1824 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 1825 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 1826 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 1827
726 /* now lets actually do the scanning */ 1828 /* now lets actually do the scanning */
1829 if (scan_ldpath || use_ldcache)
1830 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 1831 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 1832 if (scan_envpath) scanelf_envpath();
1833 if (!from_file && optind == argc && ttyname(0) == NULL)
1834 from_file = "-";
1835 if (from_file) {
1836 scanelf_from_file(from_file);
1837 from_file = *argv;
1838 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 1839 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 1840 err("Nothing to scan !?");
731 while (optind < argc) 1841 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 1842 search_path = argv[optind++];
1843 scanelf_dir(search_path);
1844 }
733 1845
734 /* clean up */ 1846 /* clean up */
735 if (find_sym) {
736 free(find_sym);
737 free(versioned_symname); 1847 free(versioned_symname);
738 }
739 if (out_format) free(out_format);
740}
741
742
743
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;
750}
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
761 new_len = strlen(*dst) + strlen(src);
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{
773 static char my_app[2];
774 my_app[0] = append;
775 my_app[1] = '\0';
776 xstrcat(dst, my_app, curr_len);
777}
778static int xemptybuffer(const char *buff)
779{
780 long i;
781 for (i=0; buff[i]; ++i) 1848 for (i = 0; ldpaths[i]; ++i)
782 if (buff[i] != ' ') 1849 free(ldpaths[i]);
1850
1851 if (ldcache != 0)
1852 munmap(ldcache, ldcache_size);
1853}
1854
1855static char **get_split_env(const char *envvar)
1856{
1857 const char *delims = " \t\n";
1858 char **envvals = NULL;
1859 char *env, *s;
1860 int nentry;
1861
1862 if ((env = getenv(envvar)) == NULL)
783 return 0; 1863 return NULL;
1864
1865 env = xstrdup(env);
1866 if (env == NULL)
784 return 1; 1867 return NULL;
1868
1869 s = strtok(env, delims);
1870 if (s == NULL) {
1871 free(env);
1872 return NULL;
1873 }
1874
1875 nentry = 0;
1876 while (s != NULL) {
1877 ++nentry;
1878 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1879 envvals[nentry-1] = s;
1880 s = strtok(NULL, delims);
1881 }
1882 envvals[nentry] = NULL;
1883
1884 /* don't want to free(env) as it contains the memory that backs
1885 * the envvals array of strings */
1886 return envvals;
785} 1887}
1888static void parseenv()
1889{
1890 qa_textrels = get_split_env("QA_TEXTRELS");
1891 qa_execstack = get_split_env("QA_EXECSTACK");
1892 qa_wx_load = get_split_env("QA_WX_LOAD");
1893}
1894#ifdef __PAX_UTILS_CLEANUP
1895static void cleanup()
1896{
1897 free(out_format);
1898 free(qa_textrels);
1899 free(qa_execstack);
1900 free(qa_wx_load);
1901}
1902#endif
786 1903
787 1904
788 1905
789int main(int argc, char *argv[]) 1906int main(int argc, char *argv[])
790{ 1907{
791 if (argc < 2) 1908 if (argc < 2)
792 usage(EXIT_FAILURE); 1909 usage(EXIT_FAILURE);
1910 parseenv();
793 parseargs(argc, argv); 1911 parseargs(argc, argv);
794 fclose(stdout); 1912 fclose(stdout);
1913#ifdef __PAX_UTILS_CLEANUP
1914 cleanup();
1915 warn("The calls to add/delete heap should be off:\n"
1916 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1917 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1918#endif
795 return EXIT_SUCCESS; 1919 return EXIT_SUCCESS;
796} 1920}

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