/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.40 Revision 1.146
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 1.40 2005/04/21 00:13:03 solar Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.146 2006/05/14 21:04:25 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"
11#if defined(__GLIBC__) || defined(__UCLIBC__)
12 #include <glob.h>
13#endif
14#if defined(__FreeBSD__) || defined(__DragonFly__)
15 #include <elf-hints.h>
16#endif
37 17
38static const char *rcsid = "$Id: scanelf.c,v 1.40 2005/04/21 00:13:03 solar Exp $"; 18static const char *rcsid = "$Id: scanelf.c,v 1.146 2006/05/14 21:04:25 vapier Exp $";
39#define argv0 "scanelf" 19#define argv0 "scanelf"
40 20
21#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
22
23#define do_state(option, flag) \
24 if (islower(option)) { \
25 flags &= ~PF_##flag; \
26 flags |= PF_NO##flag; \
27 } else { \
28 flags &= ~PF_NO##flag; \
29 flags |= PF_##flag; \
30 }
41 31
42 32
43/* prototypes */ 33/* prototypes */
34static int file_matches_list(const char *filename, char **matchlist);
35static int scanelf_elfobj(elfobj *elf);
36static int scanelf_elf(const char *filename, int fd, size_t len);
37static int scanelf_archive(const char *filename, int fd, size_t len);
44static void scanelf_file(const char *filename); 38static void scanelf_file(const char *filename);
45static void scanelf_dir(const char *path); 39static void scanelf_dir(const char *path);
46static void scanelf_ldpath(); 40static void scanelf_ldpath(void);
47static void scanelf_envpath(); 41static void scanelf_envpath(void);
48static void usage(int status); 42static void usage(int status);
43static char **get_split_env(const char *envvar);
44static void parseenv(void);
49static void parseargs(int argc, char *argv[]); 45static void parseargs(int argc, char *argv[]);
46static char *xstrdup(const char *s);
47static void *xmalloc(size_t size);
48static void *xrealloc(void *ptr, size_t size);
49static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
50#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
51static inline void xchrcat(char **dst, const char append, size_t *curr_len);
50 52
51/* variables to control behavior */ 53/* variables to control behavior */
54static char match_etypes[126] = "";
55static char *ldpaths[256];
52static char scan_ldpath = 0; 56static char scan_ldpath = 0;
53static char scan_envpath = 0; 57static char scan_envpath = 0;
54static char scan_symlink = 1; 58static char scan_symlink = 1;
59static char scan_archives = 0;
55static char dir_recurse = 0; 60static char dir_recurse = 0;
56static char dir_crossmount = 1; 61static char dir_crossmount = 1;
57static char show_pax = 0; 62static char show_pax = 0;
58static char show_stack = 0; 63static char show_phdr = 0;
59static char show_textrel = 0; 64static char show_textrel = 0;
60static char show_rpath = 0; 65static char show_rpath = 0;
61static char show_needed = 0; 66static char show_needed = 0;
62static char show_interp = 0; 67static char show_interp = 0;
68static char show_bind = 0;
69static char show_soname = 0;
70static char show_textrels = 0;
63static char show_banner = 1; 71static char show_banner = 1;
64static char be_quiet = 0; 72static char be_quiet = 0;
65static char be_verbose = 0; 73static char be_verbose = 0;
74static char be_wewy_wewy_quiet = 0;
75static char be_semi_verbose = 0;
66static char *find_sym = NULL, *versioned_symname = NULL; 76static char *find_sym = NULL, *versioned_symname = NULL;
77static char *find_lib = NULL;
78static char *find_section = NULL;
67static char *out_format = NULL; 79static char *out_format = NULL;
80static char *search_path = NULL;
81static char fix_elf = 0;
82static char gmatch = 0;
83static char use_ldcache = 0;
68 84
85static char **qa_textrels = NULL;
86static char **qa_execstack = NULL;
87static char **qa_wx_load = NULL;
69 88
89int match_bits = 0;
90caddr_t ldcache = 0;
91size_t ldcache_size = 0;
92unsigned long setpax = 0UL;
93
94/* utility funcs */
95static char *xstrdup(const char *s)
96{
97 char *ret = strdup(s);
98 if (!ret) err("Could not strdup(): %s", strerror(errno));
99 return ret;
100}
101static void *xmalloc(size_t size)
102{
103 void *ret = malloc(size);
104 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
105 return ret;
106}
107static void *xrealloc(void *ptr, size_t size)
108{
109 void *ret = realloc(ptr, size);
110 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
111 return ret;
112}
113static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
114{
115 size_t new_len;
116
117 new_len = strlen(*dst) + strlen(src);
118 if (*curr_len <= new_len) {
119 *curr_len = new_len + (*curr_len / 2);
120 *dst = realloc(*dst, *curr_len);
121 if (!*dst)
122 err("could not realloc() %li bytes", (unsigned long)*curr_len);
123 }
124
125 if (n)
126 strncat(*dst, src, n);
127 else
128 strcat(*dst, src);
129}
130static inline void xchrcat(char **dst, const char append, size_t *curr_len)
131{
132 static char my_app[2];
133 my_app[0] = append;
134 my_app[1] = '\0';
135 xstrcat(dst, my_app, curr_len);
136}
137
138/* Match filename against entries in matchlist, return TRUE
139 * if the file is listed */
140static int file_matches_list(const char *filename, char **matchlist) {
141 char **file;
142 char *match;
143 char buf[__PAX_UTILS_PATH_MAX];
144
145 if (matchlist == NULL)
146 return 0;
147
148 for (file = matchlist; *file != NULL; file++) {
149 if (search_path) {
150 snprintf(buf,__PAX_UTILS_PATH_MAX, "%s%s", search_path, *file);
151 match=buf;
152 } else {
153 match=*file;
154 }
155 if (fnmatch(match, filename, 0) == 0)
156 return 1; /* TRUE */
157 }
158 return 0; /* FALSE */
159}
70 160
71/* sub-funcs for scanelf_file() */ 161/* sub-funcs for scanelf_file() */
162static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
163{
164 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
165#define GET_SYMTABS(B) \
166 if (elf->elf_class == ELFCLASS ## B) { \
167 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
168 /* debug sections */ \
169 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
170 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
171 /* runtime sections */ \
172 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
173 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
174 if (symtab && dynsym) { \
175 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
176 } else { \
177 *sym = (void*)(symtab ? symtab : dynsym); \
178 } \
179 if (strtab && dynstr) { \
180 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
181 } else { \
182 *tab = (void*)(strtab ? strtab : dynstr); \
183 } \
184 }
185 GET_SYMTABS(32)
186 GET_SYMTABS(64)
187}
188
72static void scanelf_file_pax(elfobj *elf, char *found_pax) 189static char *scanelf_file_pax(elfobj *elf, char *found_pax)
73{ 190{
74 char *paxflags; 191 static char ret[7];
192 unsigned long i, shown;
193
75 if (!show_pax) return; 194 if (!show_pax) return NULL;
76 195
77 paxflags = pax_short_hf_flags(PAX_FLAGS(elf)); 196 shown = 0;
78 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) { 197 memset(&ret, 0, sizeof(ret));
79 *found_pax = 1; 198
80 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf))); 199 if (elf->phdr) {
81 }
82}
83static void scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
84{
85 int i;
86 if (!show_stack) return;
87#define SHOW_STACK(B) \ 200#define SHOW_PAX(B) \
88 if (elf->elf_class == ELFCLASS ## B) { \ 201 if (elf->elf_class == ELFCLASS ## B) { \
89 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 202 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
90 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 203 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
91 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 204 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
92 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \ 205 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
93 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \
94 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
95 continue; \ 206 continue; \
96 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \ 207 if (fix_elf && setpax) { \
208 /* set the paxctl flags */ \
209 ESET(phdr[i].p_flags, setpax); \
210 } \
211 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
212 continue; \
213 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
97 *found_stack = 1; \ 214 *found_pax = 1; \
98 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \ 215 ++shown; \
99 *found_relro = 1; \ 216 break; \
100 printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \
101 } \ 217 } \
102 } 218 }
103 SHOW_STACK(32) 219 SHOW_PAX(32)
104 SHOW_STACK(64) 220 SHOW_PAX(64)
105 if (!be_quiet && !*found_stack) printf("--- "); 221 }
106 if (!be_quiet && !*found_relro) printf("--- "); 222
223
224 if (fix_elf && setpax) {
225 /* set the chpax settings */
226 if (elf->elf_class == ELFCLASS32) {
227 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
228 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
229 } else {
230 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
231 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
232 }
233 }
234
235 /* fall back to EI_PAX if no PT_PAX was found */
236 if (!*ret) {
237 static char *paxflags;
238 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
239 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
240 *found_pax = 1;
241 return (be_wewy_wewy_quiet ? NULL : paxflags);
242 }
243 strncpy(ret, paxflags, sizeof(ret));
244 }
245
246 if (be_wewy_wewy_quiet || (be_quiet && !shown))
247 return NULL;
248 else
249 return ret;
107} 250}
251
252static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
253{
254 static char ret[12];
255 char *found;
256 unsigned long i, shown, multi_stack, multi_relro, multi_load;
257 int max_pt_load;
258
259 if (!show_phdr) return NULL;
260
261 memcpy(ret, "--- --- ---\0", 12);
262
263 shown = 0;
264 multi_stack = multi_relro = multi_load = 0;
265 max_pt_load = elf_max_pt_load(elf);
266
267#define NOTE_GNU_STACK ".note.GNU-stack"
268#define SHOW_PHDR(B) \
269 if (elf->elf_class == ELFCLASS ## B) { \
270 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
271 Elf ## B ## _Off offset; \
272 uint32_t flags, check_flags; \
273 if (elf->phdr != NULL) { \
274 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
275 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
276 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
277 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
278 if (!file_matches_list(elf->filename, qa_execstack)) {\
279 found = found_phdr; \
280 offset = 0; \
281 check_flags = PF_X; \
282 } else continue; \
283 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
284 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
285 found = found_relro; \
286 offset = 4; \
287 check_flags = PF_X; \
288 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
289 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
290 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
291 if (!file_matches_list(elf->filename, qa_wx_load)) {\
292 found = found_load; \
293 offset = 8; \
294 check_flags = PF_W|PF_X; \
295 } else continue; \
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
108static void scanelf_file_textrel(elfobj *elf, char *found_textrel) 354static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
109{ 355{
110 int i; 356 static const char *ret = "TEXTREL";
111 if (!show_textrel) return; 357 unsigned long i;
358
359 if (!show_textrel && !show_textrels) return NULL;
360
361 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
362
363 if (elf->phdr) {
112#define SHOW_TEXTREL(B) \ 364#define SHOW_TEXTREL(B) \
113 if (elf->elf_class == ELFCLASS ## B) { \ 365 if (elf->elf_class == ELFCLASS ## B) { \
114 Elf ## B ## _Dyn *dyn; \ 366 Elf ## B ## _Dyn *dyn; \
115 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 367 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
116 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 368 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
369 Elf ## B ## _Off offset; \
117 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 370 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
118 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 371 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
372 offset = EGET(phdr[i].p_offset); \
373 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
119 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 374 dyn = DYN ## B (elf->data + offset); \
120 while (EGET(dyn->d_tag) != DT_NULL) { \ 375 while (EGET(dyn->d_tag) != DT_NULL) { \
121 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)*/ \
122 *found_textrel = 1; \ 377 *found_textrel = 1; \
123 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 378 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
124 printf("TEXTREL "); \ 379 return (be_wewy_wewy_quiet ? NULL : ret); \
125 } \ 380 } \
126 ++dyn; \ 381 ++dyn; \
127 } \ 382 } \
128 } } 383 } }
129 SHOW_TEXTREL(32) 384 SHOW_TEXTREL(32)
130 SHOW_TEXTREL(64) 385 SHOW_TEXTREL(64)
131 if (!be_quiet && !*found_textrel) printf("------- "); 386 }
387
388 if (be_quiet || be_wewy_wewy_quiet)
389 return NULL;
390 else
391 return " - ";
132} 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}
133static void scanelf_file_rpath(elfobj *elf, char *found_rpath) 523static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
134{ 524{
135 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 525 unsigned long i, s;
136 int i;
137 char *rpath, *runpath; 526 char *rpath, *runpath, **r;
138 void *strtbl_void; 527 void *strtbl_void;
139 528
140 if (!show_rpath) return; 529 if (!show_rpath) return;
141 530
142 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 531 strtbl_void = elf_findsecbyname(elf, ".dynstr");
143 rpath = runpath = NULL; 532 rpath = runpath = NULL;
144 533
145 if (strtbl_void) { 534 if (elf->phdr && strtbl_void) {
146#define SHOW_RPATH(B) \ 535#define SHOW_RPATH(B) \
147 if (elf->elf_class == ELFCLASS ## B) { \ 536 if (elf->elf_class == ELFCLASS ## B) { \
148 Elf ## B ## _Dyn *dyn; \ 537 Elf ## B ## _Dyn *dyn; \
149 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 538 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
150 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 539 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
151 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 540 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
541 Elf ## B ## _Off offset; \
542 Elf ## B ## _Xword word; \
543 /* Scan all the program headers */ \
152 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
545 /* Just scan dynamic headers */ \
153 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 546 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
547 offset = EGET(phdr[i].p_offset); \
548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
549 /* Just scan dynamic RPATH/RUNPATH headers */ \
154 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 550 dyn = DYN ## B (elf->data + offset); \
155 while (EGET(dyn->d_tag) != DT_NULL) { \ 551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
156 if (EGET(dyn->d_tag) == DT_RPATH) { \ 552 if (word == DT_RPATH) { \
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 */ \
157 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
562 if (offset < (Elf ## B ## _Off)elf->len) { \
563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
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) \
158 *found_rpath = 1; \ 636 *found_rpath = 1; \
159 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 637 } \
160 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
161 *found_rpath = 1; \
162 } \ 638 } \
163 ++dyn; \ 639 ++dyn; \
164 } \ 640 } \
165 } } 641 } }
166 SHOW_RPATH(32) 642 SHOW_RPATH(32)
167 SHOW_RPATH(64) 643 SHOW_RPATH(64)
168 } 644 }
645
646 if (be_wewy_wewy_quiet) return;
647
169 if (rpath && runpath) { 648 if (rpath && runpath) {
170 if (!strcmp(rpath, runpath)) 649 if (!strcmp(rpath, runpath)) {
171 printf("%-5s ", runpath); 650 xstrcat(ret, runpath, ret_len);
172 else { 651 } else {
173 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath); 652 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
174 printf("{%s,%s} ", rpath, runpath); 653 xchrcat(ret, '{', ret_len);
654 xstrcat(ret, rpath, ret_len);
655 xchrcat(ret, ',', ret_len);
656 xstrcat(ret, runpath, ret_len);
657 xchrcat(ret, '}', ret_len);
175 } 658 }
176 } else if (rpath || runpath) 659 } else if (rpath || runpath)
177 printf("%-5s ", (runpath ? runpath : rpath)); 660 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
178 else if (!be_quiet && !*found_rpath) 661 else if (!be_quiet)
179 printf(" - "); 662 xstrcat(ret, " - ", ret_len);
180} 663}
181static void scanelf_file_needed(elfobj *elf, char *found_needed) 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#if defined(__GLIBC__) || defined(__UCLIBC__)
686static char *lookup_cache_lib(elfobj *elf, char *fname)
182{ 687{
183 int i; 688 int fd = 0;
689 char *strs;
690 static char buf[__PAX_UTILS_PATH_MAX] = "";
691 const char *cachefile = "/etc/ld.so.cache";
692 struct stat st;
693
694 typedef struct {
695 char magic[LDSO_CACHE_MAGIC_LEN];
696 char version[LDSO_CACHE_VER_LEN];
697 int nlibs;
698 } header_t;
699 header_t *header;
700
701 typedef struct {
702 int flags;
703 int sooffset;
704 int liboffset;
705 } libentry_t;
706 libentry_t *libent;
707
708 if (fname == NULL)
709 return NULL;
710
711 if (ldcache == 0) {
712 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
713 return NULL;
714
715 /* cache these values so we only map/unmap the cache file once */
716 ldcache_size = st.st_size;
717 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
718
719 close(fd);
720
721 if (ldcache == (caddr_t)-1) {
722 ldcache = 0;
723 return NULL;
724 }
725
726 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
727 return NULL;
728 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
729 return NULL;
730 }
731
732 header = (header_t *) ldcache;
733 libent = (libentry_t *) (ldcache + sizeof(header_t));
734 strs = (char *) &libent[header->nlibs];
735
736 for (fd = 0; fd < header->nlibs; fd++) {
737 /* this should be more fine grained, but for now we assume that
738 * diff arches will not be cached together. and we ignore the
739 * the different multilib mips cases. */
740 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
741 continue;
742 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
743 continue;
744
745 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
746 continue;
747 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
748 }
749 return buf;
750}
751#else
752#warning Cache support not implemented for your current target.
753static char *lookup_cache_lib(elfobj *elf, char *fname)
754{
755 return NULL;
756}
757#endif
758
759static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
760{
761 unsigned long i;
184 char *needed; 762 char *needed;
185 void *strtbl_void; 763 void *strtbl_void;
764 char *p;
186 765
187 if (!show_needed) return; 766 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
188 767
189 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 768 strtbl_void = elf_findsecbyname(elf, ".dynstr");
190 769
191 if (strtbl_void) { 770 if (elf->phdr && strtbl_void) {
192#define SHOW_NEEDED(B) \ 771#define SHOW_NEEDED(B) \
193 if (elf->elf_class == ELFCLASS ## B) { \ 772 if (elf->elf_class == ELFCLASS ## B) { \
194 Elf ## B ## _Dyn *dyn; \ 773 Elf ## B ## _Dyn *dyn; \
195 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 774 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
196 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 775 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
197 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 776 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
777 Elf ## B ## _Off offset; \
198 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 778 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
199 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 779 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
780 offset = EGET(phdr[i].p_offset); \
781 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
200 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 782 dyn = DYN ## B (elf->data + offset); \
201 while (EGET(dyn->d_tag) != DT_NULL) { \ 783 while (EGET(dyn->d_tag) != DT_NULL) { \
202 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 784 if (EGET(dyn->d_tag) == DT_NEEDED) { \
203 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 785 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
204 if (*found_needed) printf(","); \ 786 if (offset >= (Elf ## B ## _Off)elf->len) { \
205 printf("%s", needed); \ 787 ++dyn; \
788 continue; \
789 } \
790 needed = (char*)(elf->data + offset); \
791 if (op == 0) { \
792 if (!be_wewy_wewy_quiet) { \
793 if (*found_needed) xchrcat(ret, ',', ret_len); \
794 if (use_ldcache) \
795 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
796 needed = p; \
797 xstrcat(ret, needed, ret_len); \
798 } \
206 *found_needed = 1; \ 799 *found_needed = 1; \
800 } else { \
801 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
802 *found_lib = 1; \
803 return (be_wewy_wewy_quiet ? NULL : needed); \
804 } \
805 } \
207 } \ 806 } \
208 ++dyn; \ 807 ++dyn; \
209 } \ 808 } \
210 } } 809 } }
211 SHOW_NEEDED(32) 810 SHOW_NEEDED(32)
212 SHOW_NEEDED(64) 811 SHOW_NEEDED(64)
812 if (op == 0 && !*found_needed && be_verbose)
813 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
213 } 814 }
214 if (!be_quiet && !*found_needed) 815
215 printf(" - "); 816 return NULL;
216 else if (*found_needed)
217 printf(" ");
218} 817}
219static void scanelf_file_interp(elfobj *elf, char *found_interp) 818static char *scanelf_file_interp(elfobj *elf, char *found_interp)
220{ 819{
221 void *strtbl_void; 820 void *strtbl_void;
222 821
223 if (!show_interp) return; 822 if (!show_interp) return NULL;
224 823
225 strtbl_void = elf_findsecbyname(elf, ".interp"); 824 strtbl_void = elf_findsecbyname(elf, ".interp");
226 825
227 if (strtbl_void) { 826 if (strtbl_void) {
228#define SHOW_INTERP(B) \ 827#define SHOW_INTERP(B) \
229 if (elf->elf_class == ELFCLASS ## B) { \ 828 if (elf->elf_class == ELFCLASS ## B) { \
230 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 829 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
231 printf("%s ", elf->data + EGET(strtbl->sh_offset)); \
232 *found_interp = 1; \ 830 *found_interp = 1; \
831 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
233 } 832 }
234 SHOW_INTERP(32) 833 SHOW_INTERP(32)
235 SHOW_INTERP(64) 834 SHOW_INTERP(64)
236 } 835 }
237 if (!be_quiet && !*found_interp) 836 return NULL;
238 printf(" - ");
239 else if (*found_interp)
240 printf(" ");
241} 837}
838static char *scanelf_file_bind(elfobj *elf, char *found_bind)
839{
840 unsigned long i;
841 struct stat s;
842 char dynamic = 0;
843
844 if (!show_bind) return NULL;
845 if (!elf->phdr) return NULL;
846
847#define SHOW_BIND(B) \
848 if (elf->elf_class == ELFCLASS ## B) { \
849 Elf ## B ## _Dyn *dyn; \
850 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
851 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
852 Elf ## B ## _Off offset; \
853 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
854 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
855 dynamic = 1; \
856 offset = EGET(phdr[i].p_offset); \
857 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
858 dyn = DYN ## B (elf->data + offset); \
859 while (EGET(dyn->d_tag) != DT_NULL) { \
860 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
861 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
862 { \
863 if (be_quiet) return NULL; \
864 *found_bind = 1; \
865 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
866 } \
867 ++dyn; \
868 } \
869 } \
870 }
871 SHOW_BIND(32)
872 SHOW_BIND(64)
873
874 if (be_wewy_wewy_quiet) return NULL;
875
876 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
877 return NULL;
878 } else {
879 *found_bind = 1;
880 return (char *) (dynamic ? "LAZY" : "STATIC");
881 }
882}
883static char *scanelf_file_soname(elfobj *elf, char *found_soname)
884{
885 unsigned long i;
886 char *soname;
887 void *strtbl_void;
888
889 if (!show_soname) return NULL;
890
891 strtbl_void = elf_findsecbyname(elf, ".dynstr");
892
893 if (elf->phdr && strtbl_void) {
894#define SHOW_SONAME(B) \
895 if (elf->elf_class == ELFCLASS ## B) { \
896 Elf ## B ## _Dyn *dyn; \
897 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
898 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
899 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
900 Elf ## B ## _Off offset; \
901 /* only look for soname in shared objects */ \
902 if (ehdr->e_type != ET_DYN) \
903 return NULL; \
904 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
905 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
906 offset = EGET(phdr[i].p_offset); \
907 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
908 dyn = DYN ## B (elf->data + offset); \
909 while (EGET(dyn->d_tag) != DT_NULL) { \
910 if (EGET(dyn->d_tag) == DT_SONAME) { \
911 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
912 if (offset >= (Elf ## B ## _Off)elf->len) { \
913 ++dyn; \
914 continue; \
915 } \
916 soname = (char*)(elf->data + offset); \
917 *found_soname = 1; \
918 return (be_wewy_wewy_quiet ? NULL : soname); \
919 } \
920 ++dyn; \
921 } \
922 } }
923 SHOW_SONAME(32)
924 SHOW_SONAME(64)
925 }
926
927 return NULL;
928}
242static void scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 929static char *scanelf_file_sym(elfobj *elf, char *found_sym)
243{ 930{
244 int i; 931 unsigned long i;
932 char *ret;
245 void *symtab_void, *strtab_void; 933 void *symtab_void, *strtab_void;
246 934
247 if (!find_sym) return; 935 if (!find_sym) return NULL;
936 ret = find_sym;
248 937
249 symtab_void = elf_findsecbyname(elf, ".symtab"); 938 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
250 strtab_void = elf_findsecbyname(elf, ".strtab");
251 939
252 if (symtab_void && strtab_void) { 940 if (symtab_void && strtab_void) {
253#define FIND_SYM(B) \ 941#define FIND_SYM(B) \
254 if (elf->elf_class == ELFCLASS ## B) { \ 942 if (elf->elf_class == ELFCLASS ## B) { \
255 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 943 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
256 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 944 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
257 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 945 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
258 int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 946 unsigned long cnt = EGET(symtab->sh_entsize); \
259 char *symname; \ 947 char *symname; \
948 if (cnt) \
949 cnt = EGET(symtab->sh_size) / cnt; \
260 for (i = 0; i < cnt; ++i) { \ 950 for (i = 0; i < cnt; ++i) { \
261 if (sym->st_name) { \ 951 if (sym->st_name) { \
952 /* make sure the symbol name is in acceptable memory range */ \
262 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 953 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
954 if ((void*)symname > (void*)elf->data_end) { \
955 warnf("%s: corrupt ELF symbols", elf->filename); \
956 ++sym; \
957 continue; \
958 } \
959 /* debug display ... show all symbols and some extra info */ \
263 if (*find_sym == '*') { \ 960 if (*ret == '*') { \
264 printf("%s(%s) %5lX %15s %s\n", \ 961 printf("%s(%s) %5lX %15s %s\n", \
265 ((*found_sym == 0) ? "\n\t" : "\t"), \ 962 ((*found_sym == 0) ? "\n\t" : "\t"), \
266 (char *)basename(filename), \ 963 elf->base_filename, \
267 (long)sym->st_size, \ 964 (unsigned long)sym->st_size, \
268 (char *)get_elfstttype(sym->st_info), \ 965 get_elfstttype(sym->st_info), \
269 symname); \ 966 symname); \
270 *found_sym = 1; \ 967 *found_sym = 1; \
271 } else if ((strcmp(find_sym, symname) == 0) || \ 968 } else { \
272 (strcmp(symname, versioned_symname) == 0)) \ 969 /* allow the user to specify a comma delimited list of symbols to search for */ \
970 char *this_sym, *next_sym; \
971 this_sym = ret; \
972 do { \
973 next_sym = strchr(this_sym, ','); \
974 if (next_sym == NULL) \
975 next_sym = this_sym + strlen(this_sym); \
976 /* do we want a defined symbol ? */ \
977 if (*this_sym == '+') { \
978 if (sym->st_shndx == SHN_UNDEF) \
979 goto skip_this_sym##B; \
980 ++this_sym; \
981 /* do we want an undefined symbol ? */ \
982 } else if (*this_sym == '-') { \
983 if (sym->st_shndx != SHN_UNDEF) \
984 goto skip_this_sym##B; \
985 ++this_sym; \
986 } \
987 /* ok, lets compare the name now */ \
988 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
989 (strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) { \
990 if (be_semi_verbose) { \
991 char buf[126]; \
992 snprintf(buf, sizeof(buf), "%lX %s %s", \
993 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
994 ret = buf; \
995 } else \
996 ret = this_sym; \
273 (*found_sym)++; \ 997 (*found_sym)++; \
998 goto break_out; \
999 } \
1000 skip_this_sym##B: this_sym = next_sym + 1; \
1001 } while (*next_sym != '\0'); \
1002 } \
274 } \ 1003 } \
275 ++sym; \ 1004 ++sym; \
276 } } 1005 } }
277 FIND_SYM(32) 1006 FIND_SYM(32)
278 FIND_SYM(64) 1007 FIND_SYM(64)
279 } 1008 }
280 if (*find_sym != '*') { 1009
281 if (*found_sym) 1010break_out:
282 printf(" %s ", find_sym); 1011 if (be_wewy_wewy_quiet) return NULL;
1012
1013 if (*find_sym != '*' && *found_sym)
1014 return ret;
283 else if (!be_quiet) 1015 if (be_quiet)
284 printf(" - "); 1016 return NULL;
285 } 1017 else
1018 return (char *)" - ";
286} 1019}
1020
1021
1022static char *scanelf_file_sections(elfobj *elf, char *found_section)
1023{
1024 if (!find_section)
1025 return NULL;
1026
1027#define FIND_SECTION(B) \
1028 if (elf->elf_class == ELFCLASS ## B) { \
1029 int invert; \
1030 Elf ## B ## _Shdr *section; \
1031 invert = (*find_section == '!' ? 1 : 0); \
1032 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1033 if ((section == NULL && invert) || (section != NULL && !invert)) \
1034 *found_section = 1; \
1035 }
1036 FIND_SECTION(32)
1037 FIND_SECTION(64)
1038
1039 if (be_wewy_wewy_quiet)
1040 return NULL;
1041
1042 if (*found_section)
1043 return find_section;
1044
1045 if (be_quiet)
1046 return NULL;
1047 else
1048 return (char *)" - ";
1049}
1050
287/* scan an elf file and show all the fun stuff */ 1051/* scan an elf file and show all the fun stuff */
1052#define prints(str) write(fileno(stdout), str, strlen(str))
1053static int scanelf_elfobj(elfobj *elf)
1054{
1055 unsigned long i;
1056 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1057 found_rpath, found_needed, found_interp, found_bind, found_soname,
1058 found_sym, found_lib, found_file, found_textrels, found_section;
1059 static char *out_buffer = NULL;
1060 static size_t out_len;
1061
1062 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1063 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1064 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1065
1066 if (be_verbose > 2)
1067 printf("%s: scanning file {%s,%s}\n", elf->filename,
1068 get_elfeitype(EI_CLASS, elf->elf_class),
1069 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1070 else if (be_verbose > 1)
1071 printf("%s: scanning file\n", elf->filename);
1072
1073 /* init output buffer */
1074 if (!out_buffer) {
1075 out_len = sizeof(char) * 80;
1076 out_buffer = (char*)xmalloc(out_len);
1077 }
1078 *out_buffer = '\0';
1079
1080 /* show the header */
1081 if (!be_quiet && show_banner) {
1082 for (i = 0; out_format[i]; ++i) {
1083 if (!IS_MODIFIER(out_format[i])) continue;
1084
1085 switch (out_format[++i]) {
1086 case '+': break;
1087 case '%': break;
1088 case '#': break;
1089 case 'F':
1090 case 'p':
1091 case 'f': prints("FILE "); found_file = 1; break;
1092 case 'o': prints(" TYPE "); break;
1093 case 'x': prints(" PAX "); break;
1094 case 'e': prints("STK/REL/PTL "); break;
1095 case 't': prints("TEXTREL "); break;
1096 case 'r': prints("RPATH "); break;
1097 case 'n': prints("NEEDED "); break;
1098 case 'i': prints("INTERP "); break;
1099 case 'b': prints("BIND "); break;
1100 case 'S': prints("SONAME "); break;
1101 case 's': prints("SYM "); break;
1102 case 'N': prints("LIB "); break;
1103 case 'T': prints("TEXTRELS "); break;
1104 case 'k': prints("SECTION "); break;
1105 default: warnf("'%c' has no title ?", out_format[i]);
1106 }
1107 }
1108 if (!found_file) prints("FILE ");
1109 prints("\n");
1110 found_file = 0;
1111 show_banner = 0;
1112 }
1113
1114 /* dump all the good stuff */
1115 for (i = 0; out_format[i]; ++i) {
1116 const char *out;
1117 const char *tmp;
1118
1119 if (!IS_MODIFIER(out_format[i])) {
1120 xchrcat(&out_buffer, out_format[i], &out_len);
1121 continue;
1122 }
1123
1124 out = NULL;
1125 be_wewy_wewy_quiet = (out_format[i] == '#');
1126 be_semi_verbose = (out_format[i] == '+');
1127 switch (out_format[++i]) {
1128 case '+':
1129 case '%':
1130 case '#':
1131 xchrcat(&out_buffer, out_format[i], &out_len); break;
1132 case 'F':
1133 found_file = 1;
1134 if (be_wewy_wewy_quiet) break;
1135 xstrcat(&out_buffer, elf->filename, &out_len);
1136 break;
1137 case 'p':
1138 found_file = 1;
1139 if (be_wewy_wewy_quiet) break;
1140 tmp = elf->filename;
1141 if (search_path) {
1142 ssize_t len_search = strlen(search_path);
1143 ssize_t len_file = strlen(elf->filename);
1144 if (!strncmp(elf->filename, search_path, len_search) && \
1145 len_file > len_search)
1146 tmp += len_search;
1147 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1148 }
1149 xstrcat(&out_buffer, tmp, &out_len);
1150 break;
1151 case 'f':
1152 found_file = 1;
1153 if (be_wewy_wewy_quiet) break;
1154 tmp = strrchr(elf->filename, '/');
1155 tmp = (tmp == NULL ? elf->filename : tmp+1);
1156 xstrcat(&out_buffer, tmp, &out_len);
1157 break;
1158 case 'o': out = get_elfetype(elf); break;
1159 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1160 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1161 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1162 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1163 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1164 case 'n':
1165 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1166 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1167 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1168 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1169 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1170 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1171 default: warnf("'%c' has no scan code?", out_format[i]);
1172 }
1173 if (out) {
1174 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1175 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1176 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1177 else
1178 xstrcat(&out_buffer, out, &out_len);
1179 }
1180 }
1181
1182#define FOUND_SOMETHING() \
1183 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1184 found_rpath || found_needed || found_interp || found_bind || \
1185 found_soname || found_sym || found_lib || found_textrels || found_section )
1186
1187 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1188 xchrcat(&out_buffer, ' ', &out_len);
1189 xstrcat(&out_buffer, elf->filename, &out_len);
1190 }
1191 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1192 puts(out_buffer);
1193 fflush(stdout);
1194 }
1195
1196 return 0;
1197}
1198
1199/* scan a single elf */
1200static int scanelf_elf(const char *filename, int fd, size_t len)
1201{
1202 int ret = 1;
1203 elfobj *elf;
1204
1205 /* verify this is real ELF */
1206 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1207 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1208 return ret;
1209 }
1210 switch (match_bits) {
1211 case 32:
1212 if (elf->elf_class != ELFCLASS32)
1213 goto label_done;
1214 break;
1215 case 64:
1216 if (elf->elf_class != ELFCLASS64)
1217 goto label_done;
1218 break;
1219 default: break;
1220 }
1221 if (strlen(match_etypes)) {
1222 char sbuf[126];
1223 strncpy(sbuf, match_etypes, sizeof(sbuf));
1224 if (strchr(match_etypes, ',') != NULL) {
1225 char *p;
1226 while((p = strrchr(sbuf, ',')) != NULL) {
1227 *p = 0;
1228 if (etype_lookup(p+1) == get_etype(elf))
1229 goto label_ret;
1230 }
1231 }
1232 if (etype_lookup(sbuf) != get_etype(elf))
1233 goto label_done;
1234 }
1235
1236label_ret:
1237 ret = scanelf_elfobj(elf);
1238
1239label_done:
1240 unreadelf(elf);
1241 return ret;
1242}
1243
1244/* scan an archive of elfs */
1245static int scanelf_archive(const char *filename, int fd, size_t len)
1246{
1247 archive_handle *ar;
1248 archive_member *m;
1249 char *ar_buffer;
1250 elfobj *elf;
1251
1252 ar = ar_open_fd(filename, fd);
1253 if (ar == NULL)
1254 return 1;
1255
1256 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1257 while ((m=ar_next(ar)) != NULL) {
1258 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1259 if (elf) {
1260 scanelf_elfobj(elf);
1261 unreadelf(elf);
1262 }
1263 }
1264 munmap(ar_buffer, len);
1265
1266 return 0;
1267}
1268/* scan a file which may be an elf or an archive or some other magical beast */
288static void scanelf_file(const char *filename) 1269static void scanelf_file(const char *filename)
289{ 1270{
290 int i;
291 char found_pax, found_stack, found_relro, found_textrel,
292 found_rpath, found_needed, found_interp, found_sym,
293 found_file;
294 elfobj *elf;
295 struct stat st; 1271 struct stat st;
1272 int fd;
296 1273
297 /* make sure 'filename' exists */ 1274 /* make sure 'filename' exists */
298 if (lstat(filename, &st) == -1) { 1275 if (lstat(filename, &st) == -1) {
299 if (be_verbose > 2) printf("%s: does not exist\n", filename); 1276 if (be_verbose > 2) printf("%s: does not exist\n", filename);
300 return; 1277 return;
301 } 1278 }
1279
302 /* always handle regular files and handle symlinked files if no -y */ 1280 /* always handle regular files and handle symlinked files if no -y */
303 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) { 1281 if (S_ISLNK(st.st_mode)) {
1282 if (!scan_symlink) return;
1283 stat(filename, &st);
1284 }
1285 if (!S_ISREG(st.st_mode)) {
304 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1286 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
305 return; 1287 return;
306 } 1288 }
307 1289
308 found_pax = found_stack = found_relro = found_textrel = \ 1290 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
309 found_rpath = found_needed = found_interp = found_sym = \
310 found_file = 0;
311
312 /* verify this is real ELF */
313 if ((elf = readelf(filename)) == NULL) {
314 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
315 return; 1291 return;
316 }
317 1292
318 if (be_verbose > 1) 1293 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
319 printf("%s: {%s,%s} scanning file\n", filename, 1294 /* if it isn't an ELF, maybe it's an .a archive */
320 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1295 scanelf_archive(filename, fd, st.st_size);
321 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
322 else if (be_verbose)
323 printf("%s: scanning file\n", filename);
324 1296
325 /* show the header */ 1297 close(fd);
326 if (!be_quiet && show_banner) {
327 if (out_format) {
328 for (i=0; out_format[i]; ++i) {
329 if (out_format[i] != '%') continue;
330
331 switch (out_format[++i]) {
332 case '%': break;
333 case 'F': printf("FILE "); break;
334 case 'x': printf(" PAX "); break;
335 case 'e': printf("STK/REL "); break;
336 case 't': printf("TEXTREL "); break;
337 case 'r': printf("RPATH "); break;
338 case 'n': printf("NEEDED "); break;
339 case 'i': printf("INTERP "); break;
340 case 's': printf("SYM "); break;
341 }
342 }
343 } else {
344 printf(" TYPE ");
345 if (show_pax) printf(" PAX ");
346 if (show_stack) printf("STK/REL ");
347 if (show_textrel) printf("TEXTREL ");
348 if (show_rpath) printf("RPATH ");
349 if (show_needed) printf("NEEDED ");
350 if (show_interp) printf("INTERP ");
351 if (find_sym) printf("SYM ");
352 }
353 if (!found_file) printf(" FILE");
354 printf("\n");
355 show_banner = 0;
356 }
357
358 /* dump all the good stuff */
359 if (!be_quiet && !out_format)
360 printf("%-7s ", get_elfetype(elf));
361
362 if (out_format) {
363 for (i=0; out_format[i]; ++i) {
364 if (out_format[i] != '%') {
365 printf("%c", out_format[i]);
366 continue;
367 }
368
369 switch (out_format[++i]) {
370 case '%': printf("%%"); break;
371 case 'F': found_file = 1; printf("%s ", filename); break;
372 case 'x': scanelf_file_pax(elf, &found_pax); break;
373 case 'e': scanelf_file_stack(elf, &found_stack, &found_relro); break;
374 case 't': scanelf_file_textrel(elf, &found_textrel); break;
375 case 'r': scanelf_file_rpath(elf, &found_rpath); break;
376 case 'n': scanelf_file_needed(elf, &found_needed); break;
377 case 'i': scanelf_file_interp(elf, &found_interp); break;
378 case 's': scanelf_file_sym(elf, &found_sym, filename); break;
379 }
380 }
381 } else {
382 scanelf_file_pax(elf, &found_pax);
383 scanelf_file_stack(elf, &found_stack, &found_relro);
384 scanelf_file_textrel(elf, &found_textrel);
385 scanelf_file_rpath(elf, &found_rpath);
386 scanelf_file_needed(elf, &found_needed);
387 scanelf_file_interp(elf, &found_interp);
388 scanelf_file_sym(elf, &found_sym, filename);
389 }
390
391 if (!found_file) {
392 if (!be_quiet || found_pax || found_stack || found_textrel || \
393 found_rpath || found_needed || found_sym)
394 puts(filename);
395 } else {
396 printf("\n");
397 }
398
399 unreadelf(elf);
400} 1298}
401 1299
402/* scan a directory for ET_EXEC files and print when we find one */ 1300/* scan a directory for ET_EXEC files and print when we find one */
403static void scanelf_dir(const char *path) 1301static void scanelf_dir(const char *path)
404{ 1302{
405 register DIR *dir; 1303 register DIR *dir;
406 register struct dirent *dentry; 1304 register struct dirent *dentry;
407 struct stat st_top, st; 1305 struct stat st_top, st;
408 char buf[_POSIX_PATH_MAX]; 1306 char buf[__PAX_UTILS_PATH_MAX];
409 size_t pathlen = 0, len = 0; 1307 size_t pathlen = 0, len = 0;
410 1308
411 /* make sure path exists */ 1309 /* make sure path exists */
412 if (lstat(path, &st_top) == -1) { 1310 if (lstat(path, &st_top) == -1) {
413 if (be_verbose > 2) printf("%s: does not exist\n", path); 1311 if (be_verbose > 2) printf("%s: does not exist\n", path);
423 /* now scan the dir looking for fun stuff */ 1321 /* now scan the dir looking for fun stuff */
424 if ((dir = opendir(path)) == NULL) { 1322 if ((dir = opendir(path)) == NULL) {
425 warnf("could not opendir %s: %s", path, strerror(errno)); 1323 warnf("could not opendir %s: %s", path, strerror(errno));
426 return; 1324 return;
427 } 1325 }
428 if (be_verbose) printf("%s: scanning dir\n", path); 1326 if (be_verbose > 1) printf("%s: scanning dir\n", path);
429 1327
430 pathlen = strlen(path); 1328 pathlen = strlen(path);
431 while ((dentry = readdir(dir))) { 1329 while ((dentry = readdir(dir))) {
432 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1330 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
433 continue; 1331 continue;
434 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1332 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
435 if (len >= sizeof(buf)) { 1333 if (len >= sizeof(buf)) {
436 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1334 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1335 (unsigned long)len, (unsigned long)sizeof(buf));
437 continue; 1336 continue;
438 } 1337 }
439 sprintf(buf, "%s/%s", path, dentry->d_name); 1338 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
440 if (lstat(buf, &st) != -1) { 1339 if (lstat(buf, &st) != -1) {
441 if (S_ISREG(st.st_mode)) 1340 if (S_ISREG(st.st_mode))
442 scanelf_file(buf); 1341 scanelf_file(buf);
443 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1342 else if (dir_recurse && S_ISDIR(st.st_mode)) {
444 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1343 if (dir_crossmount || (st_top.st_dev == st.st_dev))
447 } 1346 }
448 } 1347 }
449 closedir(dir); 1348 closedir(dir);
450} 1349}
451 1350
1351static int scanelf_from_file(const char *filename)
1352{
1353 FILE *fp = NULL;
1354 char *p;
1355 char path[__PAX_UTILS_PATH_MAX];
1356
1357 if (strcmp(filename, "-") == 0)
1358 fp = stdin;
1359 else if ((fp = fopen(filename, "r")) == NULL)
1360 return 1;
1361
1362 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1363 if ((p = strchr(path, '\n')) != NULL)
1364 *p = 0;
1365 search_path = path;
1366 scanelf_dir(path);
1367 }
1368 if (fp != stdin)
1369 fclose(fp);
1370 return 0;
1371}
1372
1373#if defined(__GLIBC__) || defined(__UCLIBC__)
1374static int load_ld_so_conf(int i, const char *fname)
1375{
1376 FILE *fp = NULL;
1377 char *p;
1378 char path[__PAX_UTILS_PATH_MAX];
1379
1380 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1381 return i;
1382
1383 if ((fp = fopen(fname, "r")) == NULL)
1384 return i;
1385
1386 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1387 if ((p = strrchr(path, '\r')) != NULL)
1388 *p = 0;
1389 if ((p = strchr(path, '\n')) != NULL)
1390 *p = 0;
1391 // recursive includes of the same file will make this segfault.
1392 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1393 glob64_t gl;
1394 size_t x;
1395 char gpath[__PAX_UTILS_PATH_MAX];
1396
1397 memset(gpath, 0, sizeof(gpath));
1398
1399 if (path[8] != '/')
1400 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1401 else
1402 strncpy(gpath, &path[8], sizeof(gpath));
1403
1404 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1405 for (x = 0; x < gl.gl_pathc; ++x) {
1406 /* try to avoid direct loops */
1407 if (strcmp(gl.gl_pathv[x], fname) == 0)
1408 continue;
1409 i = load_ld_so_conf(i, gl.gl_pathv[x]);
1410 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1411 globfree64(&gl);
1412 return i;
1413 }
1414 }
1415 globfree64 (&gl);
1416 continue;
1417 } else
1418 abort();
1419 }
1420 if (*path != '/')
1421 continue;
1422
1423 ldpaths[i++] = xstrdup(path);
1424
1425 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1426 break;
1427 }
1428 ldpaths[i] = NULL;
1429
1430 fclose(fp);
1431 return i;
1432}
1433#endif
1434
1435#if defined(__FreeBSD__) || (__DragonFly__)
1436static int load_ld_so_hints(int i, const char *fname)
1437{
1438 FILE *fp = NULL;
1439 char *b = NULL, *p;
1440 struct elfhints_hdr hdr;
1441
1442 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1443 return i;
1444
1445 if ((fp = fopen(fname, "r")) == NULL)
1446 return i;
1447
1448 if ( fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1449 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1450 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1
1451 ) {
1452 fclose(fp);
1453 return i;
1454 }
1455
1456 b = (char*)malloc(hdr.dirlistlen+1);
1457 if ( fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1 ) {
1458 fclose(fp);
1459 free(b);
1460 return i;
1461 }
1462
1463 while ( (p = strsep(&b, ":")) ) {
1464 if ( *p == '\0' ) continue;
1465 ldpaths[i++] = xstrdup(p);
1466
1467 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1468 break;
1469 }
1470 ldpaths[i] = NULL;
1471
1472 free(b);
1473 fclose(fp);
1474 return i;
1475}
1476#endif
1477
452/* scan /etc/ld.so.conf for paths */ 1478/* scan /etc/ld.so.conf for paths */
453static void scanelf_ldpath() 1479static void scanelf_ldpath()
454{ 1480{
455 char scan_l, scan_ul, scan_ull; 1481 char scan_l, scan_ul, scan_ull;
456 char *path, *p; 1482 int i = 0;
457 FILE *fp;
458 1483
459 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1484 if (!ldpaths[0])
460 err("Unable to open ld.so.conf: %s", strerror(errno)); 1485 err("Unable to load any paths from ld.so.conf");
461 1486
462 scan_l = scan_ul = scan_ull = 0; 1487 scan_l = scan_ul = scan_ull = 0;
463 1488
464 if ((path = malloc(_POSIX_PATH_MAX)) == NULL) { 1489 while (ldpaths[i]) {
465 warn("Can not malloc() memory for ldpath scanning");
466 return;
467 }
468 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
469 if (*path == '/') {
470 if ((p = strrchr(path, '\r')) != NULL)
471 *p = 0;
472 if ((p = strrchr(path, '\n')) != NULL)
473 *p = 0;
474 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1; 1490 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
475 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1491 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
476 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1492 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
477 scanelf_dir(path); 1493 scanelf_dir(ldpaths[i]);
1494 ++i;
478 } 1495 }
479 free(path);
480 fclose(fp);
481 1496
482 if (!scan_l) scanelf_dir("/lib"); 1497 if (!scan_l) scanelf_dir("/lib");
483 if (!scan_ul) scanelf_dir("/usr/lib"); 1498 if (!scan_ul) scanelf_dir("/usr/lib");
484 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1499 if (!scan_ull) scanelf_dir("/usr/local/lib");
485} 1500}
490 char *path, *p; 1505 char *path, *p;
491 1506
492 path = getenv("PATH"); 1507 path = getenv("PATH");
493 if (!path) 1508 if (!path)
494 err("PATH is not set in your env !"); 1509 err("PATH is not set in your env !");
495 1510 path = xstrdup(path);
496 if ((path = strdup(path)) == NULL)
497 err("strdup failed: %s", strerror(errno));
498 1511
499 while ((p = strrchr(path, ':')) != NULL) { 1512 while ((p = strrchr(path, ':')) != NULL) {
500 scanelf_dir(p + 1); 1513 scanelf_dir(p + 1);
501 *p = 0; 1514 *p = 0;
502 } 1515 }
503 1516
504 free(path); 1517 free(path);
505} 1518}
506 1519
507
508
509/* usage / invocation handling functions */ 1520/* usage / invocation handling functions */
510#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 1521#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
511#define a_argument required_argument 1522#define a_argument required_argument
512static struct option const long_opts[] = { 1523static struct option const long_opts[] = {
513 {"path", no_argument, NULL, 'p'}, 1524 {"path", no_argument, NULL, 'p'},
514 {"ldpath", no_argument, NULL, 'l'}, 1525 {"ldpath", no_argument, NULL, 'l'},
515 {"recursive", no_argument, NULL, 'R'}, 1526 {"recursive", no_argument, NULL, 'R'},
516 {"mount", no_argument, NULL, 'm'}, 1527 {"mount", no_argument, NULL, 'm'},
517 {"symlink", no_argument, NULL, 'y'}, 1528 {"symlink", no_argument, NULL, 'y'},
1529 {"archives", no_argument, NULL, 'A'},
1530 {"ldcache", no_argument, NULL, 'L'},
1531 {"fix", no_argument, NULL, 'X'},
1532 {"setpax", a_argument, NULL, 'z'},
518 {"pax", no_argument, NULL, 'x'}, 1533 {"pax", no_argument, NULL, 'x'},
519 {"header", no_argument, NULL, 'e'}, 1534 {"header", no_argument, NULL, 'e'},
520 {"textrel", no_argument, NULL, 't'}, 1535 {"textrel", no_argument, NULL, 't'},
521 {"rpath", no_argument, NULL, 'r'}, 1536 {"rpath", no_argument, NULL, 'r'},
522 {"needed", no_argument, NULL, 'n'}, 1537 {"needed", no_argument, NULL, 'n'},
523 {"interp", no_argument, NULL, 'i'}, 1538 {"interp", no_argument, NULL, 'i'},
1539 {"bind", no_argument, NULL, 'b'},
1540 {"soname", no_argument, NULL, 'S'},
524 {"symbol", a_argument, NULL, 's'}, 1541 {"symbol", a_argument, NULL, 's'},
1542 {"section", a_argument, NULL, 'k'},
1543 {"lib", a_argument, NULL, 'N'},
1544 {"gmatch", no_argument, NULL, 'g'},
1545 {"textrels", no_argument, NULL, 'T'},
1546 {"etype", a_argument, NULL, 'E'},
1547 {"bits", a_argument, NULL, 'M'},
525 {"all", no_argument, NULL, 'a'}, 1548 {"all", no_argument, NULL, 'a'},
526 {"quiet", no_argument, NULL, 'q'}, 1549 {"quiet", no_argument, NULL, 'q'},
527 {"verbose", no_argument, NULL, 'v'}, 1550 {"verbose", no_argument, NULL, 'v'},
528 {"format", a_argument, NULL, 'F'}, 1551 {"format", a_argument, NULL, 'F'},
1552 {"from", a_argument, NULL, 'f'},
529 {"file", a_argument, NULL, 'o'}, 1553 {"file", a_argument, NULL, 'o'},
530 {"nobanner", no_argument, NULL, 'B'}, 1554 {"nobanner", no_argument, NULL, 'B'},
531 {"help", no_argument, NULL, 'h'}, 1555 {"help", no_argument, NULL, 'h'},
532 {"version", no_argument, NULL, 'V'}, 1556 {"version", no_argument, NULL, 'V'},
533 {NULL, no_argument, NULL, 0x0} 1557 {NULL, no_argument, NULL, 0x0}
534}; 1558};
1559
535static char *opts_help[] = { 1560static const char *opts_help[] = {
536 "Scan all directories in PATH environment", 1561 "Scan all directories in PATH environment",
537 "Scan all directories in /etc/ld.so.conf", 1562 "Scan all directories in /etc/ld.so.conf",
538 "Scan directories recursively", 1563 "Scan directories recursively",
539 "Don't recursively cross mount points", 1564 "Don't recursively cross mount points",
540 "Don't scan symlinks\n", 1565 "Don't scan symlinks",
1566 "Scan archives (.a files)",
1567 "Utilize ld.so.cache information (use with -r/-n)",
1568 "Try and 'fix' bad things (use with -r/-e)",
1569 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
541 "Print PaX markings", 1570 "Print PaX markings",
542 "Print GNU_STACK markings", 1571 "Print GNU_STACK/PT_LOAD markings",
543 "Print TEXTREL information", 1572 "Print TEXTREL information",
544 "Print RPATH information", 1573 "Print RPATH information",
545 "Print NEEDED information", 1574 "Print NEEDED information",
546 "Print INTERP information", 1575 "Print INTERP information",
1576 "Print BIND information",
1577 "Print SONAME information",
547 "Find a specified symbol", 1578 "Find a specified symbol",
1579 "Find a specified section",
1580 "Find a specified library",
1581 "Use strncmp to match libraries. (use with -N)",
1582 "Locate cause of TEXTREL",
1583 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1584 "Print only ELF files matching numeric bits",
548 "Print all scanned info (-x -e -t -r)\n", 1585 "Print all scanned info (-x -e -t -r -b)\n",
549 "Only output 'bad' things", 1586 "Only output 'bad' things",
550 "Be verbose (can be specified more than once)", 1587 "Be verbose (can be specified more than once)",
551 "Use specified format for output", 1588 "Use specified format for output",
1589 "Read input stream from a filename",
552 "Write output stream to a filename", 1590 "Write output stream to a filename",
553 "Don't display the header", 1591 "Don't display the header",
554 "Print this help and exit", 1592 "Print this help and exit",
555 "Print version and exit", 1593 "Print version and exit",
556 NULL 1594 NULL
557}; 1595};
558 1596
559/* display usage and exit */ 1597/* display usage and exit */
560static void usage(int status) 1598static void usage(int status)
561{ 1599{
562 int i; 1600 unsigned long i;
563 printf(" Scan ELF binaries for stuff\n\n" 1601 printf("* Scan ELF binaries for stuff\n\n"
564 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1602 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
565 printf("Options: -[%s]\n", PARSE_FLAGS); 1603 printf("Options: -[%s]\n", PARSE_FLAGS);
566 for (i = 0; long_opts[i].name; ++i) 1604 for (i = 0; long_opts[i].name; ++i)
567 if (long_opts[i].has_arg == no_argument) 1605 if (long_opts[i].has_arg == no_argument)
568 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1606 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
569 long_opts[i].name, opts_help[i]); 1607 long_opts[i].name, opts_help[i]);
570 else 1608 else
571 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1609 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
572 long_opts[i].name, opts_help[i]); 1610 long_opts[i].name, opts_help[i]);
1611
1612 if (status != EXIT_SUCCESS)
1613 exit(status);
1614
1615 puts("\nThe format modifiers for the -F option are:");
1616 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1617 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1618 puts(" i INTERP \tb BIND \ts symbol");
1619 puts(" N library \to Type \tT TEXTRELs");
1620 puts(" S SONAME \tk section");
1621 puts(" p filename (with search path removed)");
1622 puts(" f filename (short name/basename)");
1623 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1624
1625 puts("\nELF Etypes:");
1626 print_etypes(stdout);
1627
573 exit(status); 1628 exit(status);
574} 1629}
575 1630
576/* parse command line arguments and preform needed actions */ 1631/* parse command line arguments and preform needed actions */
577static void parseargs(int argc, char *argv[]) 1632static void parseargs(int argc, char *argv[])
578{ 1633{
579 int flag; 1634 int i;
1635 const char *from_file = NULL;
580 1636
581 opterr = 0; 1637 opterr = 0;
582 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1638 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
583 switch (flag) { 1639 switch (i) {
584 1640
585 case 'V': 1641 case 'V':
586 printf("%s compiled %s\n%s\n" 1642 printf("pax-utils-%s: %s compiled %s\n%s\n"
587 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1643 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
588 __FILE__, __DATE__, rcsid, argv0); 1644 VERSION, __FILE__, __DATE__, rcsid, argv0);
589 exit(EXIT_SUCCESS); 1645 exit(EXIT_SUCCESS);
590 break; 1646 break;
591 case 'h': usage(EXIT_SUCCESS); break; 1647 case 'h': usage(EXIT_SUCCESS); break;
592 1648 case 'f':
1649 if (from_file) warn("You prob don't want to specify -f twice");
1650 from_file = optarg;
1651 break;
1652 case 'E':
1653 strncpy(match_etypes, optarg, sizeof(match_etypes));
1654 break;
1655 case 'M':
1656 match_bits = atoi(optarg);
1657 break;
593 case 'o': { 1658 case 'o': {
594 FILE *fp = NULL;
595 fp = freopen(optarg, "w", stdout); 1659 if (freopen(optarg, "w", stdout) == NULL)
596 if (fp == NULL)
597 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1660 err("Could not open output stream '%s': %s", optarg, strerror(errno));
598 stdout = fp;
599 break; 1661 break;
600 } 1662 }
601 1663 case 'k':
1664 if (find_section) warn("You prob don't want to specify -k twice");
1665 find_section = optarg;
1666 break;
602 case 's': { 1667 case 's': {
603 size_t len; 1668 if (find_sym) warn("You prob don't want to specify -s twice");
604 find_sym = strdup(optarg); 1669 find_sym = optarg;
605 if (!find_sym) { 1670 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
606 warnf("Could not malloc() mem for sym scan"); 1671 sprintf(versioned_symname, "%s@", find_sym);
607 find_sym = NULL;
608 break; 1672 break;
1673 }
1674 case 'N': {
1675 if (find_lib) warn("You prob don't want to specify -N twice");
1676 find_lib = optarg;
1677 break;
1678 }
1679
1680 case 'F': {
1681 if (out_format) warn("You prob don't want to specify -F twice");
1682 out_format = optarg;
1683 break;
1684 }
1685 case 'z': {
1686 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1687 size_t x;
1688
1689 for (x = 0 ; x < strlen(optarg); x++) {
1690 switch(optarg[x]) {
1691 case 'p':
1692 case 'P':
1693 do_state(optarg[x], PAGEEXEC);
1694 break;
1695 case 's':
1696 case 'S':
1697 do_state(optarg[x], SEGMEXEC);
1698 break;
1699 case 'm':
1700 case 'M':
1701 do_state(optarg[x], MPROTECT);
1702 break;
1703 case 'e':
1704 case 'E':
1705 do_state(optarg[x], EMUTRAMP);
1706 break;
1707 case 'r':
1708 case 'R':
1709 do_state(optarg[x], RANDMMAP);
1710 break;
1711 case 'x':
1712 case 'X':
1713 do_state(optarg[x], RANDEXEC);
1714 break;
1715 default:
1716 break;
1717 }
609 } 1718 }
610 len = strlen(find_sym) + 1; 1719 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
611 versioned_symname = (char *)malloc(sizeof(char) * (len+1)); 1720 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
612 if (!versioned_symname) { 1721 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
613 free(find_sym); 1722 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
614 find_sym = NULL; 1723 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
615 warnf("Could not malloc() mem for sym scan"); 1724 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1725 setpax = flags;
616 break; 1726 break;
617 } 1727 }
618 sprintf(versioned_symname, "%s@", find_sym); 1728 case 'g': gmatch = 1; break;
619 break; 1729 case 'L': use_ldcache = 1; break;
620 }
621
622 case 'F': {
623 out_format = strdup(optarg);
624 if (!out_format)
625 err("Could not malloc() mem for output format");
626 break;
627 }
628
629 case 'y': scan_symlink = 0; break; 1730 case 'y': scan_symlink = 0; break;
1731 case 'A': scan_archives = 1; break;
630 case 'B': show_banner = 0; break; 1732 case 'B': show_banner = 0; break;
631 case 'l': scan_ldpath = 1; break; 1733 case 'l': scan_ldpath = 1; break;
632 case 'p': scan_envpath = 1; break; 1734 case 'p': scan_envpath = 1; break;
633 case 'R': dir_recurse = 1; break; 1735 case 'R': dir_recurse = 1; break;
634 case 'm': dir_crossmount = 0; break; 1736 case 'm': dir_crossmount = 0; break;
1737 case 'X': ++fix_elf; break;
635 case 'x': show_pax = 1; break; 1738 case 'x': show_pax = 1; break;
636 case 'e': show_stack = 1; break; 1739 case 'e': show_phdr = 1; break;
637 case 't': show_textrel = 1; break; 1740 case 't': show_textrel = 1; break;
638 case 'r': show_rpath = 1; break; 1741 case 'r': show_rpath = 1; break;
639 case 'n': show_needed = 1; break; 1742 case 'n': show_needed = 1; break;
640 case 'i': show_interp = 1; break; 1743 case 'i': show_interp = 1; break;
1744 case 'b': show_bind = 1; break;
1745 case 'S': show_soname = 1; break;
1746 case 'T': show_textrels = 1; break;
641 case 'q': be_quiet = 1; break; 1747 case 'q': be_quiet = 1; break;
642 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1748 case 'v': be_verbose = (be_verbose % 20) + 1; break;
643 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break; 1749 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
644 1750
645 case ':': 1751 case ':':
646 warn("Option missing parameter\n"); 1752 err("Option '%c' is missing parameter", optopt);
647 usage(EXIT_FAILURE);
648 break;
649 case '?': 1753 case '?':
650 warn("Unknown option\n"); 1754 err("Unknown option '%c' or argument missing", optopt);
651 usage(EXIT_FAILURE);
652 break;
653 default: 1755 default:
654 err("Unhandled option '%c'", flag); 1756 err("Unhandled option '%c'; please report this", i);
655 break;
656 }
657 } 1757 }
658 1758 }
659 if (be_quiet && be_verbose)
660 err("You can be quiet or you can be verbose, not both, stupid");
661 1759
662 /* let the format option override all other options */ 1760 /* let the format option override all other options */
663 if (out_format) { 1761 if (out_format) {
664 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1762 show_pax = show_phdr = show_textrel = show_rpath = \
1763 show_needed = show_interp = show_bind = show_soname = \
1764 show_textrels = 0;
665 for (flag=0; out_format[flag]; ++flag) { 1765 for (i = 0; out_format[i]; ++i) {
666 if (out_format[flag] != '%') continue; 1766 if (!IS_MODIFIER(out_format[i])) continue;
667 1767
668 switch (out_format[++flag]) { 1768 switch (out_format[++i]) {
1769 case '+': break;
669 case '%': break; 1770 case '%': break;
1771 case '#': break;
670 case 'F': break; 1772 case 'F': break;
1773 case 'p': break;
1774 case 'f': break;
1775 case 'k': break;
671 case 's': break; 1776 case 's': break;
1777 case 'N': break;
1778 case 'o': break;
672 case 'x': show_pax = 1; break; 1779 case 'x': show_pax = 1; break;
673 case 'e': show_stack = 1; break; 1780 case 'e': show_phdr = 1; break;
674 case 't': show_textrel = 1; break; 1781 case 't': show_textrel = 1; break;
675 case 'r': show_rpath = 1; break; 1782 case 'r': show_rpath = 1; break;
676 case 'n': show_needed = 1; break; 1783 case 'n': show_needed = 1; break;
677 case 'i': show_interp = 1; break; 1784 case 'i': show_interp = 1; break;
1785 case 'b': show_bind = 1; break;
1786 case 'S': show_soname = 1; break;
1787 case 'T': show_textrels = 1; break;
678 default: 1788 default:
679 err("Invalid format specifier '%c' (byte %i)", 1789 err("Invalid format specifier '%c' (byte %i)",
680 out_format[flag], flag+1); 1790 out_format[i], i+1);
681 } 1791 }
682 } 1792 }
1793
1794 /* construct our default format */
1795 } else {
1796 size_t fmt_len = 30;
1797 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1798 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1799 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1800 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1801 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1802 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1803 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1804 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1805 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1806 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1807 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1808 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1809 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1810 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1811 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
683 } 1812 }
1813 if (be_verbose > 2) printf("Format: %s\n", out_format);
684 1814
685 /* now lets actually do the scanning */ 1815 /* now lets actually do the scanning */
1816 if (scan_ldpath || use_ldcache)
1817#if defined(__GLIBC__) || defined(__UCLIBC__)
1818 load_ld_so_conf(0, "/etc/ld.so.conf");
1819#elif defined(__FreeBSD__) || defined(__DragonFly__)
1820 load_ld_so_hints(0, _PATH_ELF_HINTS);
1821#endif
686 if (scan_ldpath) scanelf_ldpath(); 1822 if (scan_ldpath) scanelf_ldpath();
687 if (scan_envpath) scanelf_envpath(); 1823 if (scan_envpath) scanelf_envpath();
1824 if (!from_file && optind == argc && ttyname(0) == NULL)
1825 from_file = "-";
1826 if (from_file) {
1827 scanelf_from_file(from_file);
1828 from_file = *argv;
1829 }
688 if (optind == argc && !scan_ldpath && !scan_envpath) 1830 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
689 err("Nothing to scan !?"); 1831 err("Nothing to scan !?");
690 while (optind < argc) 1832 while (optind < argc) {
691 scanelf_dir(argv[optind++]); 1833 search_path = argv[optind++];
1834 scanelf_dir(search_path);
1835 }
692 1836
693 /* clean up */ 1837 /* clean up */
694 if (find_sym) { 1838 if (versioned_symname) free(versioned_symname);
695 free(find_sym); 1839 for (i = 0; ldpaths[i]; ++i)
696 free(versioned_symname); 1840 free(ldpaths[i]);
1841
1842 if (ldcache != 0)
1843 munmap(ldcache, ldcache_size);
1844}
1845
1846static char **get_split_env(const char *envvar) {
1847 char **envvals = NULL;
1848 char *saveptr = NULL;
1849 char *env;
1850 char *s;
1851 int nentry;
1852
1853 if ((env = getenv(envvar)) == NULL)
1854 return NULL;
1855
1856 env = xstrdup(env);
1857 if (env == NULL)
1858 return NULL;
1859
1860 nentry = 0;
1861 for (s = strtok_r(env, " \t\n", &saveptr); s != NULL; s = strtok_r(NULL, " \t\n", &saveptr)) {
1862 if ((envvals = xrealloc(envvals, sizeof(char *)*(nentry+1))) == NULL)
1863 return NULL;
1864 envvals[nentry++] = s;
697 } 1865 }
698 if (out_format) free(out_format); 1866 envvals[nentry] = NULL;
1867
1868 return envvals;
1869}
1870
1871static void parseenv() {
1872 qa_textrels=get_split_env("QA_TEXTRELS");
1873 qa_execstack=get_split_env("QA_EXECSTACK");
1874 qa_wx_load=get_split_env("QA_WX_LOAD");
699} 1875}
700 1876
701 1877
702 1878
703int main(int argc, char *argv[]) 1879int main(int argc, char *argv[])
704{ 1880{
705 if (argc < 2) 1881 if (argc < 2)
706 usage(EXIT_FAILURE); 1882 usage(EXIT_FAILURE);
1883 parseenv();
707 parseargs(argc, argv); 1884 parseargs(argc, argv);
708 fclose(stdout); 1885 fclose(stdout);
1886#ifdef __BOUNDS_CHECKING_ON
1887 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1888#endif
709 return EXIT_SUCCESS; 1889 return EXIT_SUCCESS;
710} 1890}

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