/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.70 Revision 1.146
1/* 1/*
2 * Copyright 2003-2005 Gentoo Foundation 2 * Copyright 2003-2006 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.70 2005/06/03 23:41:59 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.146 2006/05/14 21:04:25 vapier Exp $
5 * 5 *
6 ******************************************************************** 6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20 * MA 02111-1307, USA.
21 */ 8 */
22 9
23#include <stdio.h>
24#include <stdlib.h>
25#include <sys/types.h>
26#include <libgen.h>
27#include <limits.h>
28#define __USE_GNU
29#include <string.h>
30#include <errno.h>
31#include <unistd.h>
32#include <sys/stat.h>
33#include <dirent.h>
34#include <getopt.h>
35#include <assert.h>
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 1.70 2005/06/03 23:41:59 vapier 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
41#define IS_MODIFIER(c) (c == '%' || c == '#') 21#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
42 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 }
43 31
44 32
45/* 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);
46static void scanelf_file(const char *filename); 38static void scanelf_file(const char *filename);
47static void scanelf_dir(const char *path); 39static void scanelf_dir(const char *path);
48static void scanelf_ldpath(); 40static void scanelf_ldpath(void);
49static void scanelf_envpath(); 41static void scanelf_envpath(void);
50static void usage(int status); 42static void usage(int status);
43static char **get_split_env(const char *envvar);
44static void parseenv(void);
51static void parseargs(int argc, char *argv[]); 45static void parseargs(int argc, char *argv[]);
52static char *xstrdup(const char *s); 46static char *xstrdup(const char *s);
53static void *xmalloc(size_t size); 47static void *xmalloc(size_t size);
48static void *xrealloc(void *ptr, size_t size);
54static void xstrcat(char **dst, const char *src, size_t *curr_len); 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)
55static inline void xchrcat(char **dst, const char append, size_t *curr_len); 51static inline void xchrcat(char **dst, const char append, size_t *curr_len);
56 52
57/* variables to control behavior */ 53/* variables to control behavior */
54static char match_etypes[126] = "";
58static char *ldpaths[256]; 55static char *ldpaths[256];
59static char scan_ldpath = 0; 56static char scan_ldpath = 0;
60static char scan_envpath = 0; 57static char scan_envpath = 0;
61static char scan_symlink = 1; 58static char scan_symlink = 1;
59static char scan_archives = 0;
62static char dir_recurse = 0; 60static char dir_recurse = 0;
63static char dir_crossmount = 1; 61static char dir_crossmount = 1;
64static char show_pax = 0; 62static char show_pax = 0;
65static char show_stack = 0; 63static char show_phdr = 0;
66static char show_textrel = 0; 64static char show_textrel = 0;
67static char show_rpath = 0; 65static char show_rpath = 0;
68static char show_needed = 0; 66static char show_needed = 0;
69static char show_interp = 0; 67static char show_interp = 0;
70static char show_bind = 0; 68static char show_bind = 0;
69static char show_soname = 0;
70static char show_textrels = 0;
71static char show_banner = 1; 71static char show_banner = 1;
72static char be_quiet = 0; 72static char be_quiet = 0;
73static char be_verbose = 0; 73static char be_verbose = 0;
74static char be_wewy_wewy_quiet = 0; 74static char be_wewy_wewy_quiet = 0;
75static char be_semi_verbose = 0;
75static 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;
76static char *out_format = NULL; 79static char *out_format = NULL;
77static char *search_path = NULL; 80static char *search_path = NULL;
81static char fix_elf = 0;
82static char gmatch = 0;
83static char use_ldcache = 0;
78 84
85static char **qa_textrels = NULL;
86static char **qa_execstack = NULL;
87static char **qa_wx_load = NULL;
79 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}
80 160
81/* 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
82static char *scanelf_file_pax(elfobj *elf, char *found_pax) 189static char *scanelf_file_pax(elfobj *elf, char *found_pax)
83{ 190{
84 static char *paxflags;
85 static char ret[7]; 191 static char ret[7];
86 unsigned long i, shown; 192 unsigned long i, shown;
87
88 193
89 if (!show_pax) return NULL; 194 if (!show_pax) return NULL;
90 195
91 shown = 0; 196 shown = 0;
92 memset(&ret, 0, sizeof(ret)); 197 memset(&ret, 0, sizeof(ret));
97 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 202 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
98 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 203 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
99 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 204 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
100 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ 205 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
101 continue; \ 206 continue; \
102 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ 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))) \
103 continue; \ 212 continue; \
104 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ 213 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
105 *found_pax = 1; \ 214 *found_pax = 1; \
106 ++shown; \ 215 ++shown; \
107 break; \ 216 break; \
109 } 218 }
110 SHOW_PAX(32) 219 SHOW_PAX(32)
111 SHOW_PAX(64) 220 SHOW_PAX(64)
112 } 221 }
113 222
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
114 /* fall back to EI_PAX if no PT_PAX was found */ 235 /* fall back to EI_PAX if no PT_PAX was found */
115 if (!*ret) { 236 if (!*ret) {
237 static char *paxflags;
116 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); 238 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
117 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { 239 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
118 *found_pax = 1; 240 *found_pax = 1;
119 return paxflags; 241 return (be_wewy_wewy_quiet ? NULL : paxflags);
120 } 242 }
121 strncpy(ret, paxflags, sizeof(ret)); 243 strncpy(ret, paxflags, sizeof(ret));
122 // ++shown;
123 } 244 }
124 245
125 if (be_quiet && !shown) 246 if (be_wewy_wewy_quiet || (be_quiet && !shown))
126 return NULL;
127 return ret;
128
129}
130static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
131{
132 static char ret[8] = "--- ---";
133 char *found;
134 unsigned long i, off, shown;
135
136 if (!show_stack) return NULL;
137
138 shown = 0;
139
140 if (elf->phdr) {
141#define SHOW_STACK(B) \
142 if (elf->elf_class == ELFCLASS ## B) { \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
146 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
147 found = found_stack; \
148 off = 0; \
149 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
150 found = found_relro; \
151 off = 4; \
152 } else \
153 continue; \
154 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
155 continue; \
156 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \
157 *found = 1; \
158 ++shown; \
159 } \
160 }
161 SHOW_STACK(32)
162 SHOW_STACK(64)
163 }
164
165 if (be_quiet && !shown)
166 return NULL; 247 return NULL;
167 else 248 else
168 return ret; 249 return ret;
169} 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
170static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 354static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
171{ 355{
172 static char ret[] = "TEXTREL"; 356 static const char *ret = "TEXTREL";
173 unsigned long i; 357 unsigned long i;
174 358
175 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;
176 362
177 if (elf->phdr) { 363 if (elf->phdr) {
178#define SHOW_TEXTREL(B) \ 364#define SHOW_TEXTREL(B) \
179 if (elf->elf_class == ELFCLASS ## B) { \ 365 if (elf->elf_class == ELFCLASS ## B) { \
180 Elf ## B ## _Dyn *dyn; \ 366 Elf ## B ## _Dyn *dyn; \
200 } 386 }
201 387
202 if (be_quiet || be_wewy_wewy_quiet) 388 if (be_quiet || be_wewy_wewy_quiet)
203 return NULL; 389 return NULL;
204 else 390 else
205 return (char *)" - "; 391 return " - ";
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 }
206} 522}
207static 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)
208{ 524{
209 unsigned long i, s; 525 unsigned long i, s;
210 char *rpath, *runpath, **r; 526 char *rpath, *runpath, **r;
244 /* Verify the memory is somewhat sane */ \ 560 /* Verify the memory is somewhat sane */ \
245 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
246 if (offset < (Elf ## B ## _Off)elf->len) { \ 562 if (offset < (Elf ## B ## _Off)elf->len) { \
247 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ 563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
248 *r = (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); \
249 /* If quiet, don't output paths in ld.so.conf */ \ 568 /* If quiet, don't output paths in ld.so.conf */ \
250 if (be_quiet) { \ 569 if (be_quiet) { \
251 size_t len; \ 570 size_t len; \
252 char *start, *end; \ 571 char *start, *end; \
253 for (s = 0; *r && ldpaths[s]; ++s) { \ 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; \
254 /* scan each path in : delimited list */ \ 575 /* scan each path in : delimited list */ \
255 start = *r; \ 576 while (start) { \
577 rpath_security_checks(elf, start, get_elfdtype(word)); \
256 end = strchr(start, ':'); \ 578 end = strchr(start, ':'); \
257 while ((start && ((end = strchr(start, ':')) != NULL)) || start) { \
258 len = (end ? abs(end - start) : strlen(start)); \ 579 len = (end ? abs(end - start) : strlen(start)); \
580 if (use_ldcache) \
581 for (s = 0; ldpaths[s]; ++s) \
259 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ 582 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
260 *r = (end ? end + 1 : NULL); \ 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)++; \
261 break; \ 588 break; \
262 } \ 589 } \
590 if (!*r || !end) \
591 break; \
592 else \
263 start = (end ? start + len + 1 : NULL); \ 593 start = start + len + 1; \
264 } \
265 } \ 594 } \
266 } \ 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) \
267 if (*r) *found_rpath = 1; \ 636 *found_rpath = 1; \
637 } \
268 } \ 638 } \
269 ++dyn; \ 639 ++dyn; \
270 } \ 640 } \
271 } } 641 } }
272 SHOW_RPATH(32) 642 SHOW_RPATH(32)
289 } else if (rpath || runpath) 659 } else if (rpath || runpath)
290 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 660 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
291 else if (!be_quiet) 661 else if (!be_quiet)
292 xstrcat(ret, " - ", ret_len); 662 xstrcat(ret, " - ", ret_len);
293} 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#if defined(__GLIBC__) || defined(__UCLIBC__)
686static char *lookup_cache_lib(elfobj *elf, char *fname)
687{
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
294static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 759static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
295{ 760{
296 unsigned long i; 761 unsigned long i;
297 char *needed; 762 char *needed;
298 void *strtbl_void; 763 void *strtbl_void;
764 char *p;
299 765
300 if (!show_needed) return; 766 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
301 767
302 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 768 strtbl_void = elf_findsecbyname(elf, ".dynstr");
303 769
304 if (elf->phdr && strtbl_void) { 770 if (elf->phdr && strtbl_void) {
305#define SHOW_NEEDED(B) \ 771#define SHOW_NEEDED(B) \
320 if (offset >= (Elf ## B ## _Off)elf->len) { \ 786 if (offset >= (Elf ## B ## _Off)elf->len) { \
321 ++dyn; \ 787 ++dyn; \
322 continue; \ 788 continue; \
323 } \ 789 } \
324 needed = (char*)(elf->data + offset); \ 790 needed = (char*)(elf->data + offset); \
791 if (op == 0) { \
792 if (!be_wewy_wewy_quiet) { \
325 if (*found_needed) xchrcat(ret, ',', ret_len); \ 793 if (*found_needed) xchrcat(ret, ',', ret_len); \
326 if (!be_wewy_wewy_quiet) xstrcat(ret, needed, 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 } \
327 *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 } \
328 } \ 806 } \
329 ++dyn; \ 807 ++dyn; \
330 } \ 808 } \
331 } } 809 } }
332 SHOW_NEEDED(32) 810 SHOW_NEEDED(32)
333 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);
334 } 814 }
815
816 return NULL;
335} 817}
336static char *scanelf_file_interp(elfobj *elf, char *found_interp) 818static char *scanelf_file_interp(elfobj *elf, char *found_interp)
337{ 819{
338 void *strtbl_void; 820 void *strtbl_void;
339 821
355} 837}
356static char *scanelf_file_bind(elfobj *elf, char *found_bind) 838static char *scanelf_file_bind(elfobj *elf, char *found_bind)
357{ 839{
358 unsigned long i; 840 unsigned long i;
359 struct stat s; 841 struct stat s;
842 char dynamic = 0;
360 843
361 if (!show_bind) return NULL; 844 if (!show_bind) return NULL;
362 if (!elf->phdr) return NULL; 845 if (!elf->phdr) return NULL;
363 846
364#define SHOW_BIND(B) \ 847#define SHOW_BIND(B) \
367 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 850 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
368 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 851 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
369 Elf ## B ## _Off offset; \ 852 Elf ## B ## _Off offset; \
370 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 853 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
371 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 854 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
855 dynamic = 1; \
372 offset = EGET(phdr[i].p_offset); \ 856 offset = EGET(phdr[i].p_offset); \
373 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 857 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
374 dyn = DYN ## B (elf->data + offset); \ 858 dyn = DYN ## B (elf->data + offset); \
375 while (EGET(dyn->d_tag) != DT_NULL) { \ 859 while (EGET(dyn->d_tag) != DT_NULL) { \
376 if (EGET(dyn->d_tag) == DT_BIND_NOW || \ 860 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
391 875
392 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { 876 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
393 return NULL; 877 return NULL;
394 } else { 878 } else {
395 *found_bind = 1; 879 *found_bind = 1;
396 return (char *) "LAZY"; 880 return (char *) (dynamic ? "LAZY" : "STATIC");
397 } 881 }
398} 882}
399static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 883static char *scanelf_file_soname(elfobj *elf, char *found_soname)
400{ 884{
401 unsigned long i; 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}
929static char *scanelf_file_sym(elfobj *elf, char *found_sym)
930{
931 unsigned long i;
932 char *ret;
402 void *symtab_void, *strtab_void; 933 void *symtab_void, *strtab_void;
403 934
404 if (!find_sym) return NULL; 935 if (!find_sym) return NULL;
936 ret = find_sym;
405 937
406 /* debug sections */ 938 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
407 symtab_void = elf_findsecbyname(elf, ".symtab");
408 strtab_void = elf_findsecbyname(elf, ".strtab");
409 /* fall back to runtime sections */
410 if (!symtab_void || !strtab_void) {
411 symtab_void = elf_findsecbyname(elf, ".dynsym");
412 strtab_void = elf_findsecbyname(elf, ".dynstr");
413 }
414 939
415 if (symtab_void && strtab_void) { 940 if (symtab_void && strtab_void) {
416 char *base, *basemem;
417 basemem = xstrdup(filename);
418 base = basename(basemem);
419#define FIND_SYM(B) \ 941#define FIND_SYM(B) \
420 if (elf->elf_class == ELFCLASS ## B) { \ 942 if (elf->elf_class == ELFCLASS ## B) { \
421 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 943 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
422 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 944 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
423 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)); \
424 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 946 unsigned long cnt = EGET(symtab->sh_entsize); \
425 char *symname; \ 947 char *symname; \
948 if (cnt) \
949 cnt = EGET(symtab->sh_size) / cnt; \
426 for (i = 0; i < cnt; ++i) { \ 950 for (i = 0; i < cnt; ++i) { \
427 if (sym->st_name) { \ 951 if (sym->st_name) { \
952 /* make sure the symbol name is in acceptable memory range */ \
428 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 */ \
429 if (*find_sym == '*') { \ 960 if (*ret == '*') { \
430 printf("%s(%s) %5lX %15s %s\n", \ 961 printf("%s(%s) %5lX %15s %s\n", \
431 ((*found_sym == 0) ? "\n\t" : "\t"), \ 962 ((*found_sym == 0) ? "\n\t" : "\t"), \
432 base, \ 963 elf->base_filename, \
433 (long)sym->st_size, \ 964 (unsigned long)sym->st_size, \
434 (char *)get_elfstttype(sym->st_info), \ 965 get_elfstttype(sym->st_info), \
435 symname); \ 966 symname); \
436 *found_sym = 1; \ 967 *found_sym = 1; \
437 } else if ((strcmp(find_sym, symname) == 0) || \ 968 } else { \
438 (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; \
439 (*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 } \
440 } \ 1003 } \
441 ++sym; \ 1004 ++sym; \
442 } } 1005 } }
443 FIND_SYM(32) 1006 FIND_SYM(32)
444 FIND_SYM(64) 1007 FIND_SYM(64)
445 free(basemem);
446 } 1008 }
447 1009
1010break_out:
448 if (be_wewy_wewy_quiet) return NULL; 1011 if (be_wewy_wewy_quiet) return NULL;
449 1012
450 if (*find_sym != '*' && *found_sym) 1013 if (*find_sym != '*' && *found_sym)
451 return find_sym; 1014 return ret;
452 if (be_quiet) 1015 if (be_quiet)
453 return NULL; 1016 return NULL;
454 else 1017 else
455 return (char *)" - "; 1018 return (char *)" - ";
456} 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
457/* scan an elf file and show all the fun stuff */ 1051/* scan an elf file and show all the fun stuff */
458#define prints(str) write(fileno(stdout), str, strlen(str)) 1052#define prints(str) write(fileno(stdout), str, strlen(str))
459static void scanelf_file(const char *filename) 1053static int scanelf_elfobj(elfobj *elf)
460{ 1054{
461 unsigned long i; 1055 unsigned long i;
462 char found_pax, found_stack, found_relro, found_textrel, 1056 char found_pax, found_phdr, found_relro, found_load, found_textrel,
463 found_rpath, found_needed, found_interp, found_bind, 1057 found_rpath, found_needed, found_interp, found_bind, found_soname,
464 found_sym, found_file; 1058 found_sym, found_lib, found_file, found_textrels, found_section;
465 elfobj *elf;
466 struct stat st;
467 static char *out_buffer = NULL; 1059 static char *out_buffer = NULL;
468 static size_t out_len; 1060 static size_t out_len;
469 1061
470 /* make sure 'filename' exists */
471 if (lstat(filename, &st) == -1) {
472 if (be_verbose > 2) printf("%s: does not exist\n", filename);
473 return;
474 }
475 /* always handle regular files and handle symlinked files if no -y */
476 if (S_ISLNK(st.st_mode)) {
477 if (!scan_symlink) return;
478 stat(filename, &st);
479 }
480 if (!S_ISREG(st.st_mode)) {
481 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
482 return;
483 }
484
485 found_pax = found_stack = found_relro = found_textrel = \ 1062 found_pax = found_phdr = found_relro = found_load = found_textrel = \
486 found_rpath = found_needed = found_interp = found_bind = \ 1063 found_rpath = found_needed = found_interp = found_bind = found_soname = \
487 found_sym = found_file = 0; 1064 found_sym = found_lib = found_file = found_textrels = found_section = 0;
488 1065
489 /* verify this is real ELF */
490 if ((elf = readelf(filename)) == NULL) {
491 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
492 return;
493 }
494
495 if (be_verbose > 1) 1066 if (be_verbose > 2)
496 printf("%s: scanning file {%s,%s}\n", filename, 1067 printf("%s: scanning file {%s,%s}\n", elf->filename,
497 get_elfeitype(EI_CLASS, elf->elf_class), 1068 get_elfeitype(EI_CLASS, elf->elf_class),
498 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 1069 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
499 else if (be_verbose) 1070 else if (be_verbose > 1)
500 printf("%s: scanning file\n", filename); 1071 printf("%s: scanning file\n", elf->filename);
501 1072
502 /* init output buffer */ 1073 /* init output buffer */
503 if (!out_buffer) { 1074 if (!out_buffer) {
504 out_len = sizeof(char) * 80; 1075 out_len = sizeof(char) * 80;
505 out_buffer = (char*)xmalloc(out_len); 1076 out_buffer = (char*)xmalloc(out_len);
510 if (!be_quiet && show_banner) { 1081 if (!be_quiet && show_banner) {
511 for (i = 0; out_format[i]; ++i) { 1082 for (i = 0; out_format[i]; ++i) {
512 if (!IS_MODIFIER(out_format[i])) continue; 1083 if (!IS_MODIFIER(out_format[i])) continue;
513 1084
514 switch (out_format[++i]) { 1085 switch (out_format[++i]) {
1086 case '+': break;
515 case '%': break; 1087 case '%': break;
516 case '#': break; 1088 case '#': break;
517 case 'F': 1089 case 'F':
518 case 'p': 1090 case 'p':
519 case 'f': prints("FILE "); found_file = 1; break; 1091 case 'f': prints("FILE "); found_file = 1; break;
520 case 'o': prints(" TYPE "); break; 1092 case 'o': prints(" TYPE "); break;
521 case 'x': prints(" PAX "); break; 1093 case 'x': prints(" PAX "); break;
522 case 'e': prints("STK/REL "); break; 1094 case 'e': prints("STK/REL/PTL "); break;
523 case 't': prints("TEXTREL "); break; 1095 case 't': prints("TEXTREL "); break;
524 case 'r': prints("RPATH "); break; 1096 case 'r': prints("RPATH "); break;
525 case 'n': prints("NEEDED "); break; 1097 case 'n': prints("NEEDED "); break;
526 case 'i': prints("INTERP "); break; 1098 case 'i': prints("INTERP "); break;
527 case 'b': prints("BIND "); break; 1099 case 'b': prints("BIND "); break;
1100 case 'S': prints("SONAME "); break;
528 case 's': prints("SYM "); 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]);
529 } 1106 }
530 } 1107 }
531 if (!found_file) prints("FILE "); 1108 if (!found_file) prints("FILE ");
532 prints("\n"); 1109 prints("\n");
533 found_file = 0; 1110 found_file = 0;
537 /* dump all the good stuff */ 1114 /* dump all the good stuff */
538 for (i = 0; out_format[i]; ++i) { 1115 for (i = 0; out_format[i]; ++i) {
539 const char *out; 1116 const char *out;
540 const char *tmp; 1117 const char *tmp;
541 1118
542 /* make sure we trim leading spaces in quiet mode */
543 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
544 *out_buffer = '\0';
545
546 if (!IS_MODIFIER(out_format[i])) { 1119 if (!IS_MODIFIER(out_format[i])) {
547 xchrcat(&out_buffer, out_format[i], &out_len); 1120 xchrcat(&out_buffer, out_format[i], &out_len);
548 continue; 1121 continue;
549 } 1122 }
550 1123
551 out = NULL; 1124 out = NULL;
552 be_wewy_wewy_quiet = (out_format[i] == '#'); 1125 be_wewy_wewy_quiet = (out_format[i] == '#');
1126 be_semi_verbose = (out_format[i] == '+');
553 switch (out_format[++i]) { 1127 switch (out_format[++i]) {
1128 case '+':
554 case '%': 1129 case '%':
555 case '#': 1130 case '#':
556 xchrcat(&out_buffer, out_format[i], &out_len); break; 1131 xchrcat(&out_buffer, out_format[i], &out_len); break;
557 case 'F': 1132 case 'F':
1133 found_file = 1;
558 if (be_wewy_wewy_quiet) break; 1134 if (be_wewy_wewy_quiet) break;
1135 xstrcat(&out_buffer, elf->filename, &out_len);
1136 break;
1137 case 'p':
559 found_file = 1; 1138 found_file = 1;
560 xstrcat(&out_buffer, filename, &out_len);
561 break;
562 case 'p':
563 if (be_wewy_wewy_quiet) break; 1139 if (be_wewy_wewy_quiet) break;
564 found_file = 1;
565 tmp = filename; 1140 tmp = elf->filename;
566 if (search_path) { 1141 if (search_path) {
567 ssize_t len_search = strlen(search_path); 1142 ssize_t len_search = strlen(search_path);
568 ssize_t len_file = strlen(filename); 1143 ssize_t len_file = strlen(elf->filename);
569 if (!strncmp(filename, search_path, len_search) && \ 1144 if (!strncmp(elf->filename, search_path, len_search) && \
570 len_file > len_search) 1145 len_file > len_search)
571 tmp += len_search; 1146 tmp += len_search;
572 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 1147 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
573 } 1148 }
574 xstrcat(&out_buffer, tmp, &out_len); 1149 xstrcat(&out_buffer, tmp, &out_len);
575 break; 1150 break;
576 case 'f': 1151 case 'f':
1152 found_file = 1;
577 if (be_wewy_wewy_quiet) break; 1153 if (be_wewy_wewy_quiet) break;
578 found_file = 1;
579 tmp = strrchr(filename, '/'); 1154 tmp = strrchr(elf->filename, '/');
580 tmp = (tmp == NULL ? filename : tmp+1); 1155 tmp = (tmp == NULL ? elf->filename : tmp+1);
581 xstrcat(&out_buffer, tmp, &out_len); 1156 xstrcat(&out_buffer, tmp, &out_len);
582 break; 1157 break;
583 case 'o': out = get_elfetype(elf); break; 1158 case 'o': out = get_elfetype(elf); break;
584 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1159 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
585 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1160 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
586 case 't': out = scanelf_file_textrel(elf, &found_textrel); 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;
587 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1163 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1164 case 'n':
588 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1165 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
589 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1166 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
590 case 'b': out = scanelf_file_bind(elf, &found_bind); break; 1167 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1168 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
591 case 's': out = scanelf_file_sym(elf, &found_sym, filename); 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]);
592 } 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
593 if (out) xstrcat(&out_buffer, out, &out_len); 1178 xstrcat(&out_buffer, out, &out_len);
1179 }
594 } 1180 }
595 1181
596#define FOUND_SOMETHING() \ 1182#define FOUND_SOMETHING() \
597 (found_pax || found_stack || found_textrel || found_rpath || \ 1183 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
598 found_needed || found_interp || found_bind || found_sym) 1184 found_rpath || found_needed || found_interp || found_bind || \
1185 found_soname || found_sym || found_lib || found_textrels || found_section )
599 1186
600 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 1187 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
601 xchrcat(&out_buffer, ' ', &out_len); 1188 xchrcat(&out_buffer, ' ', &out_len);
602 xstrcat(&out_buffer, filename, &out_len); 1189 xstrcat(&out_buffer, elf->filename, &out_len);
603 } 1190 }
604 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) 1191 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
605 puts(out_buffer); 1192 puts(out_buffer);
1193 fflush(stdout);
1194 }
606 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:
607 unreadelf(elf); 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 */
1269static void scanelf_file(const char *filename)
1270{
1271 struct stat st;
1272 int fd;
1273
1274 /* make sure 'filename' exists */
1275 if (lstat(filename, &st) == -1) {
1276 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1277 return;
1278 }
1279
1280 /* always handle regular files and handle symlinked files if no -y */
1281 if (S_ISLNK(st.st_mode)) {
1282 if (!scan_symlink) return;
1283 stat(filename, &st);
1284 }
1285 if (!S_ISREG(st.st_mode)) {
1286 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1287 return;
1288 }
1289
1290 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1291 return;
1292
1293 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1294 /* if it isn't an ELF, maybe it's an .a archive */
1295 scanelf_archive(filename, fd, st.st_size);
1296
1297 close(fd);
608} 1298}
609 1299
610/* 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 */
611static void scanelf_dir(const char *path) 1301static void scanelf_dir(const char *path)
612{ 1302{
613 register DIR *dir; 1303 register DIR *dir;
614 register struct dirent *dentry; 1304 register struct dirent *dentry;
615 struct stat st_top, st; 1305 struct stat st_top, st;
616 char buf[_POSIX_PATH_MAX]; 1306 char buf[__PAX_UTILS_PATH_MAX];
617 size_t pathlen = 0, len = 0; 1307 size_t pathlen = 0, len = 0;
618 1308
619 /* make sure path exists */ 1309 /* make sure path exists */
620 if (lstat(path, &st_top) == -1) { 1310 if (lstat(path, &st_top) == -1) {
621 if (be_verbose > 2) printf("%s: does not exist\n", path); 1311 if (be_verbose > 2) printf("%s: does not exist\n", path);
631 /* now scan the dir looking for fun stuff */ 1321 /* now scan the dir looking for fun stuff */
632 if ((dir = opendir(path)) == NULL) { 1322 if ((dir = opendir(path)) == NULL) {
633 warnf("could not opendir %s: %s", path, strerror(errno)); 1323 warnf("could not opendir %s: %s", path, strerror(errno));
634 return; 1324 return;
635 } 1325 }
636 if (be_verbose) printf("%s: scanning dir\n", path); 1326 if (be_verbose > 1) printf("%s: scanning dir\n", path);
637 1327
638 pathlen = strlen(path); 1328 pathlen = strlen(path);
639 while ((dentry = readdir(dir))) { 1329 while ((dentry = readdir(dir))) {
640 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1330 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
641 continue; 1331 continue;
642 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1332 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
643 if (len >= sizeof(buf)) { 1333 if (len >= sizeof(buf)) {
644 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));
645 continue; 1336 continue;
646 } 1337 }
647 sprintf(buf, "%s/%s", path, dentry->d_name); 1338 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
648 if (lstat(buf, &st) != -1) { 1339 if (lstat(buf, &st) != -1) {
649 if (S_ISREG(st.st_mode)) 1340 if (S_ISREG(st.st_mode))
650 scanelf_file(buf); 1341 scanelf_file(buf);
651 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1342 else if (dir_recurse && S_ISDIR(st.st_mode)) {
652 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1343 if (dir_crossmount || (st_top.st_dev == st.st_dev))
655 } 1346 }
656 } 1347 }
657 closedir(dir); 1348 closedir(dir);
658} 1349}
659 1350
660static int scanelf_from_file(char *filename) 1351static int scanelf_from_file(const char *filename)
661{ 1352{
662 FILE *fp = NULL; 1353 FILE *fp = NULL;
663 char *p; 1354 char *p;
664 char path[_POSIX_PATH_MAX]; 1355 char path[__PAX_UTILS_PATH_MAX];
665 1356
666 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) 1357 if (strcmp(filename, "-") == 0)
667 fp = stdin; 1358 fp = stdin;
668 else if ((fp = fopen(filename, "r")) == NULL) 1359 else if ((fp = fopen(filename, "r")) == NULL)
669 return 1; 1360 return 1;
670 1361
671 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1362 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
672 if ((p = strchr(path, '\n')) != NULL) 1363 if ((p = strchr(path, '\n')) != NULL)
673 *p = 0; 1364 *p = 0;
674 search_path = path; 1365 search_path = path;
675 scanelf_dir(path); 1366 scanelf_dir(path);
676 } 1367 }
677 if (fp != stdin) 1368 if (fp != stdin)
678 fclose(fp); 1369 fclose(fp);
679 return 0; 1370 return 0;
680} 1371}
681 1372
682static void load_ld_so_conf() 1373#if defined(__GLIBC__) || defined(__UCLIBC__)
1374static int load_ld_so_conf(int i, const char *fname)
683{ 1375{
684 FILE *fp = NULL; 1376 FILE *fp = NULL;
685 char *p; 1377 char *p;
686 char path[_POSIX_PATH_MAX]; 1378 char path[__PAX_UTILS_PATH_MAX];
687 int i = 0;
688 1379
689 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1380 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
690 return; 1381 return i;
691 1382
1383 if ((fp = fopen(fname, "r")) == NULL)
1384 return i;
1385
692 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { 1386 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
693 if (*path != '/')
694 continue;
695
696 if ((p = strrchr(path, '\r')) != NULL) 1387 if ((p = strrchr(path, '\r')) != NULL)
697 *p = 0; 1388 *p = 0;
698 if ((p = strchr(path, '\n')) != NULL) 1389 if ((p = strchr(path, '\n')) != NULL)
699 *p = 0; 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;
700 1422
701 ldpaths[i++] = xstrdup(path); 1423 ldpaths[i++] = xstrdup(path);
702 1424
703 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) 1425 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
704 break; 1426 break;
705 } 1427 }
706 ldpaths[i] = NULL; 1428 ldpaths[i] = NULL;
707 1429
708 fclose(fp); 1430 fclose(fp);
1431 return i;
709} 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
710 1477
711/* scan /etc/ld.so.conf for paths */ 1478/* scan /etc/ld.so.conf for paths */
712static void scanelf_ldpath() 1479static void scanelf_ldpath()
713{ 1480{
714 char scan_l, scan_ul, scan_ull; 1481 char scan_l, scan_ul, scan_ull;
748 } 1515 }
749 1516
750 free(path); 1517 free(path);
751} 1518}
752 1519
753
754
755/* usage / invocation handling functions */ 1520/* usage / invocation handling functions */
756#define PARSE_FLAGS "plRmyxetrnibs:aqvF:f:o:BhV" 1521#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
757#define a_argument required_argument 1522#define a_argument required_argument
758static struct option const long_opts[] = { 1523static struct option const long_opts[] = {
759 {"path", no_argument, NULL, 'p'}, 1524 {"path", no_argument, NULL, 'p'},
760 {"ldpath", no_argument, NULL, 'l'}, 1525 {"ldpath", no_argument, NULL, 'l'},
761 {"recursive", no_argument, NULL, 'R'}, 1526 {"recursive", no_argument, NULL, 'R'},
762 {"mount", no_argument, NULL, 'm'}, 1527 {"mount", no_argument, NULL, 'm'},
763 {"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'},
764 {"pax", no_argument, NULL, 'x'}, 1533 {"pax", no_argument, NULL, 'x'},
765 {"header", no_argument, NULL, 'e'}, 1534 {"header", no_argument, NULL, 'e'},
766 {"textrel", no_argument, NULL, 't'}, 1535 {"textrel", no_argument, NULL, 't'},
767 {"rpath", no_argument, NULL, 'r'}, 1536 {"rpath", no_argument, NULL, 'r'},
768 {"needed", no_argument, NULL, 'n'}, 1537 {"needed", no_argument, NULL, 'n'},
769 {"interp", no_argument, NULL, 'i'}, 1538 {"interp", no_argument, NULL, 'i'},
770 {"bind", no_argument, NULL, 'b'}, 1539 {"bind", no_argument, NULL, 'b'},
1540 {"soname", no_argument, NULL, 'S'},
771 {"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'},
772 {"all", no_argument, NULL, 'a'}, 1548 {"all", no_argument, NULL, 'a'},
773 {"quiet", no_argument, NULL, 'q'}, 1549 {"quiet", no_argument, NULL, 'q'},
774 {"verbose", no_argument, NULL, 'v'}, 1550 {"verbose", no_argument, NULL, 'v'},
775 {"format", a_argument, NULL, 'F'}, 1551 {"format", a_argument, NULL, 'F'},
776 {"from", a_argument, NULL, 'f'}, 1552 {"from", a_argument, NULL, 'f'},
777 {"file", a_argument, NULL, 'o'}, 1553 {"file", a_argument, NULL, 'o'},
778 {"nobanner", no_argument, NULL, 'B'}, 1554 {"nobanner", no_argument, NULL, 'B'},
779 {"help", no_argument, NULL, 'h'}, 1555 {"help", no_argument, NULL, 'h'},
780 {"version", no_argument, NULL, 'V'}, 1556 {"version", no_argument, NULL, 'V'},
781 {NULL, no_argument, NULL, 0x0} 1557 {NULL, no_argument, NULL, 0x0}
782}; 1558};
784static const char *opts_help[] = { 1560static const char *opts_help[] = {
785 "Scan all directories in PATH environment", 1561 "Scan all directories in PATH environment",
786 "Scan all directories in /etc/ld.so.conf", 1562 "Scan all directories in /etc/ld.so.conf",
787 "Scan directories recursively", 1563 "Scan directories recursively",
788 "Don't recursively cross mount points", 1564 "Don't recursively cross mount points",
789 "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",
790 "Print PaX markings", 1570 "Print PaX markings",
791 "Print GNU_STACK markings", 1571 "Print GNU_STACK/PT_LOAD markings",
792 "Print TEXTREL information", 1572 "Print TEXTREL information",
793 "Print RPATH information", 1573 "Print RPATH information",
794 "Print NEEDED information", 1574 "Print NEEDED information",
795 "Print INTERP information", 1575 "Print INTERP information",
796 "Print BIND information", 1576 "Print BIND information",
1577 "Print SONAME information",
797 "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",
798 "Print all scanned info (-x -e -t -r -n -i -b)\n", 1585 "Print all scanned info (-x -e -t -r -b)\n",
799 "Only output 'bad' things", 1586 "Only output 'bad' things",
800 "Be verbose (can be specified more than once)", 1587 "Be verbose (can be specified more than once)",
801 "Use specified format for output", 1588 "Use specified format for output",
802 "Read input stream from a filename", 1589 "Read input stream from a filename",
803 "Write output stream to a filename", 1590 "Write output stream to a filename",
810/* display usage and exit */ 1597/* display usage and exit */
811static void usage(int status) 1598static void usage(int status)
812{ 1599{
813 unsigned long i; 1600 unsigned long i;
814 printf("* Scan ELF binaries for stuff\n\n" 1601 printf("* Scan ELF binaries for stuff\n\n"
815 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1602 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
816 printf("Options: -[%s]\n", PARSE_FLAGS); 1603 printf("Options: -[%s]\n", PARSE_FLAGS);
817 for (i = 0; long_opts[i].name; ++i) 1604 for (i = 0; long_opts[i].name; ++i)
818 if (long_opts[i].has_arg == no_argument) 1605 if (long_opts[i].has_arg == no_argument)
819 printf(" -%c, --%-13s* %s\n", long_opts[i].val, 1606 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
820 long_opts[i].name, opts_help[i]); 1607 long_opts[i].name, opts_help[i]);
821 else 1608 else
822 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, 1609 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
823 long_opts[i].name, opts_help[i]); 1610 long_opts[i].name, opts_help[i]);
824 1611
825 if (status != EXIT_SUCCESS) 1612 if (status != EXIT_SUCCESS)
826 exit(status); 1613 exit(status);
827 1614
828 puts("\nThe format modifiers for the -F option are:"); 1615 puts("\nThe format modifiers for the -F option are:");
829 puts(" F Filename \tx PaX Flags \te STACK/RELRO"); 1616 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
830 puts(" t TEXTREL \tr RPATH \tn NEEDED"); 1617 puts(" t TEXTREL \tr RPATH \tn NEEDED");
831 puts(" i INTERP \tb BIND \ts symbol"); 1618 puts(" i INTERP \tb BIND \ts symbol");
1619 puts(" N library \to Type \tT TEXTRELs");
1620 puts(" S SONAME \tk section");
832 puts(" p filename (with search path removed)"); 1621 puts(" p filename (with search path removed)");
833 puts(" f base filename"); 1622 puts(" f filename (short name/basename)");
834 puts("Prefix each modifier with '%' (verbose) or '#' (silent)"); 1623 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1624
1625 puts("\nELF Etypes:");
1626 print_etypes(stdout);
835 1627
836 exit(status); 1628 exit(status);
837} 1629}
838 1630
839/* parse command line arguments and preform needed actions */ 1631/* parse command line arguments and preform needed actions */
840static void parseargs(int argc, char *argv[]) 1632static void parseargs(int argc, char *argv[])
841{ 1633{
842 int i; 1634 int i;
843 char *from_file = NULL; 1635 const char *from_file = NULL;
844 1636
845 opterr = 0; 1637 opterr = 0;
846 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1638 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
847 switch (i) { 1639 switch (i) {
848 1640
849 case 'V': 1641 case 'V':
850 printf("%s compiled %s\n%s\n" 1642 printf("pax-utils-%s: %s compiled %s\n%s\n"
851 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1643 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
852 __FILE__, __DATE__, rcsid, argv0); 1644 VERSION, __FILE__, __DATE__, rcsid, argv0);
853 exit(EXIT_SUCCESS); 1645 exit(EXIT_SUCCESS);
854 break; 1646 break;
855 case 'h': usage(EXIT_SUCCESS); break; 1647 case 'h': usage(EXIT_SUCCESS); break;
856 case 'f': 1648 case 'f':
857 if (from_file) err("Don't specify -f twice"); 1649 if (from_file) warn("You prob don't want to specify -f twice");
858 from_file = xstrdup(optarg); 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);
859 break; 1657 break;
860 case 'o': { 1658 case 'o': {
861 FILE *fp = NULL;
862 if ((fp = freopen(optarg, "w", stdout)) == NULL) 1659 if (freopen(optarg, "w", stdout) == NULL)
863 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1660 err("Could not open output stream '%s': %s", optarg, strerror(errno));
864 SET_STDOUT(fp);
865 break; 1661 break;
866 } 1662 }
867 1663 case 'k':
1664 if (find_section) warn("You prob don't want to specify -k twice");
1665 find_section = optarg;
1666 break;
868 case 's': { 1667 case 's': {
869 size_t len;
870 if (find_sym) err("Don't specify -s twice"); 1668 if (find_sym) warn("You prob don't want to specify -s twice");
871 find_sym = xstrdup(optarg); 1669 find_sym = optarg;
872 len = strlen(find_sym) + 1;
873 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1670 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
874 sprintf(versioned_symname, "%s@", find_sym); 1671 sprintf(versioned_symname, "%s@", find_sym);
875 break; 1672 break;
876 } 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 }
877 1679
878 case 'F': { 1680 case 'F': {
879 if (out_format) err("Don't specify -F twice"); 1681 if (out_format) warn("You prob don't want to specify -F twice");
880 out_format = xstrdup(optarg); 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);
881 break; 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 }
882 } 1718 }
883 1719 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1720 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1721 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1722 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1723 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1724 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1725 setpax = flags;
1726 break;
1727 }
1728 case 'g': gmatch = 1; break;
1729 case 'L': use_ldcache = 1; break;
884 case 'y': scan_symlink = 0; break; 1730 case 'y': scan_symlink = 0; break;
1731 case 'A': scan_archives = 1; break;
885 case 'B': show_banner = 0; break; 1732 case 'B': show_banner = 0; break;
886 case 'l': scan_ldpath = 1; break; 1733 case 'l': scan_ldpath = 1; break;
887 case 'p': scan_envpath = 1; break; 1734 case 'p': scan_envpath = 1; break;
888 case 'R': dir_recurse = 1; break; 1735 case 'R': dir_recurse = 1; break;
889 case 'm': dir_crossmount = 0; break; 1736 case 'm': dir_crossmount = 0; break;
1737 case 'X': ++fix_elf; break;
890 case 'x': show_pax = 1; break; 1738 case 'x': show_pax = 1; break;
891 case 'e': show_stack = 1; break; 1739 case 'e': show_phdr = 1; break;
892 case 't': show_textrel = 1; break; 1740 case 't': show_textrel = 1; break;
893 case 'r': show_rpath = 1; break; 1741 case 'r': show_rpath = 1; break;
894 case 'n': show_needed = 1; break; 1742 case 'n': show_needed = 1; break;
895 case 'i': show_interp = 1; break; 1743 case 'i': show_interp = 1; break;
896 case 'b': show_bind = 1; break; 1744 case 'b': show_bind = 1; break;
1745 case 'S': show_soname = 1; break;
1746 case 'T': show_textrels = 1; break;
897 case 'q': be_quiet = 1; break; 1747 case 'q': be_quiet = 1; break;
898 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1748 case 'v': be_verbose = (be_verbose % 20) + 1; break;
899 case 'a': show_pax = show_stack = show_textrel = show_rpath = \ 1749 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
900 show_needed = show_interp = show_bind = 1; break;
901 1750
902 case ':': 1751 case ':':
903 err("Option missing parameter\n"); 1752 err("Option '%c' is missing parameter", optopt);
904 case '?': 1753 case '?':
905 err("Unknown option\n"); 1754 err("Unknown option '%c' or argument missing", optopt);
906 default: 1755 default:
907 err("Unhandled option '%c'", i); 1756 err("Unhandled option '%c'; please report this", i);
908 } 1757 }
909 } 1758 }
910 1759
911 /* let the format option override all other options */ 1760 /* let the format option override all other options */
912 if (out_format) { 1761 if (out_format) {
913 show_pax = show_stack = show_textrel = show_rpath = \ 1762 show_pax = show_phdr = show_textrel = show_rpath = \
914 show_needed = show_interp = show_bind = 0; 1763 show_needed = show_interp = show_bind = show_soname = \
1764 show_textrels = 0;
915 for (i = 0; out_format[i]; ++i) { 1765 for (i = 0; out_format[i]; ++i) {
916 if (!IS_MODIFIER(out_format[i])) continue; 1766 if (!IS_MODIFIER(out_format[i])) continue;
917 1767
918 switch (out_format[++i]) { 1768 switch (out_format[++i]) {
1769 case '+': break;
919 case '%': break; 1770 case '%': break;
920 case '#': break; 1771 case '#': break;
921 case 'F': break; 1772 case 'F': break;
922 case 'p': break; 1773 case 'p': break;
923 case 'f': break; 1774 case 'f': break;
1775 case 'k': break;
924 case 's': break; 1776 case 's': break;
1777 case 'N': break;
925 case 'o': break; 1778 case 'o': break;
926 case 'x': show_pax = 1; break; 1779 case 'x': show_pax = 1; break;
927 case 'e': show_stack = 1; break; 1780 case 'e': show_phdr = 1; break;
928 case 't': show_textrel = 1; break; 1781 case 't': show_textrel = 1; break;
929 case 'r': show_rpath = 1; break; 1782 case 'r': show_rpath = 1; break;
930 case 'n': show_needed = 1; break; 1783 case 'n': show_needed = 1; break;
931 case 'i': show_interp = 1; break; 1784 case 'i': show_interp = 1; break;
932 case 'b': show_bind = 1; break; 1785 case 'b': show_bind = 1; break;
1786 case 'S': show_soname = 1; break;
1787 case 'T': show_textrels = 1; break;
933 default: 1788 default:
934 err("Invalid format specifier '%c' (byte %i)", 1789 err("Invalid format specifier '%c' (byte %i)",
935 out_format[i], i+1); 1790 out_format[i], i+1);
936 } 1791 }
937 } 1792 }
938 1793
939 /* construct our default format */ 1794 /* construct our default format */
940 } else { 1795 } else {
941 size_t fmt_len = 30; 1796 size_t fmt_len = 30;
942 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1797 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
943 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1798 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
944 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1799 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
945 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1800 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
946 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1801 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
947 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1802 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
948 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1803 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
949 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1804 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
950 if (show_bind) xstrcat(&out_format, "%b ", &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);
951 if (find_sym) xstrcat(&out_format, "%s ", &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);
952 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1811 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
953 } 1812 }
954 if (be_verbose > 2) printf("Format: %s\n", out_format); 1813 if (be_verbose > 2) printf("Format: %s\n", out_format);
955 1814
956 /* now lets actually do the scanning */ 1815 /* now lets actually do the scanning */
957 if (scan_ldpath || (show_rpath && be_quiet)) 1816 if (scan_ldpath || use_ldcache)
958 load_ld_so_conf(); 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
959 if (scan_ldpath) scanelf_ldpath(); 1822 if (scan_ldpath) scanelf_ldpath();
960 if (scan_envpath) scanelf_envpath(); 1823 if (scan_envpath) scanelf_envpath();
1824 if (!from_file && optind == argc && ttyname(0) == NULL)
1825 from_file = "-";
961 if (from_file) { 1826 if (from_file) {
962 scanelf_from_file(from_file); 1827 scanelf_from_file(from_file);
963 free(from_file);
964 from_file = *argv; 1828 from_file = *argv;
965 } 1829 }
966 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) 1830 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
967 err("Nothing to scan !?"); 1831 err("Nothing to scan !?");
968 while (optind < argc) { 1832 while (optind < argc) {
969 search_path = argv[optind++]; 1833 search_path = argv[optind++];
970 scanelf_dir(search_path); 1834 scanelf_dir(search_path);
971 } 1835 }
972 1836
973 /* clean up */ 1837 /* clean up */
974 if (find_sym) { 1838 if (versioned_symname) free(versioned_symname);
975 free(find_sym);
976 free(versioned_symname);
977 }
978 if (out_format) free(out_format);
979 for (i = 0; ldpaths[i]; ++i) 1839 for (i = 0; ldpaths[i]; ++i)
980 free(ldpaths[i]); 1840 free(ldpaths[i]);
981}
982 1841
983 1842 if (ldcache != 0)
984 1843 munmap(ldcache, ldcache_size);
985/* utility funcs */
986static char *xstrdup(const char *s)
987{
988 char *ret = strdup(s);
989 if (!ret) err("Could not strdup(): %s", strerror(errno));
990 return ret;
991} 1844}
992 1845
993static void *xmalloc(size_t size) 1846static char **get_split_env(const char *envvar) {
994{ 1847 char **envvals = NULL;
995 void *ret = malloc(size); 1848 char *saveptr = NULL;
996 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1849 char *env;
997 return ret; 1850 char *s;
998} 1851 int nentry;
999 1852
1000static void xstrcat(char **dst, const char *src, size_t *curr_len) 1853 if ((env = getenv(envvar)) == NULL)
1001{ 1854 return NULL;
1002 size_t new_len;
1003 1855
1004 new_len = strlen(*dst) + strlen(src); 1856 env = xstrdup(env);
1005 if (*curr_len <= new_len) { 1857 if (env == NULL)
1006 *curr_len = new_len + (*curr_len / 2); 1858 return NULL;
1007 *dst = realloc(*dst, *curr_len);
1008 if (!*dst)
1009 err("could not realloc %li bytes", (unsigned long)*curr_len);
1010 }
1011 1859
1012 strcat(*dst, src); 1860 nentry = 0;
1013} 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;
1865 }
1866 envvals[nentry] = NULL;
1014 1867
1015static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1868 return envvals;
1016{
1017 static char my_app[2];
1018 my_app[0] = append;
1019 my_app[1] = '\0';
1020 xstrcat(dst, my_app, curr_len);
1021} 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");
1875}
1876
1022 1877
1023 1878
1024int main(int argc, char *argv[]) 1879int main(int argc, char *argv[])
1025{ 1880{
1026 if (argc < 2) 1881 if (argc < 2)
1027 usage(EXIT_FAILURE); 1882 usage(EXIT_FAILURE);
1883 parseenv();
1028 parseargs(argc, argv); 1884 parseargs(argc, argv);
1029 fclose(stdout); 1885 fclose(stdout);
1030#ifdef __BOUNDS_CHECKING_ON 1886#ifdef __BOUNDS_CHECKING_ON
1031 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); 1887 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1032#endif 1888#endif

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