/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.44 Revision 1.176
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 2 * Copyright 2003-2006 Gentoo Foundation
4 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.176 2007/04/08 19:14:31 solar Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 * MA 02111-1307, USA.
22 */ 8 */
23 9
24#include <stdio.h>
25#include <stdlib.h>
26#include <sys/types.h>
27#define __USE_GNU
28#include <string.h>
29#include <errno.h>
30#include <unistd.h>
31#include <sys/stat.h>
32#include <dirent.h>
33#include <getopt.h>
34#include <assert.h>
35
36#include "paxelf.h" 10#include "paxinc.h"
37 11
38static const char *rcsid = "$Id: scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $"; 12static const char *rcsid = "$Id: scanelf.c,v 1.176 2007/04/08 19:14:31 solar Exp $";
39#define argv0 "scanelf" 13#define argv0 "scanelf"
40 14
41 15#define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
42 16
43/* prototypes */ 17/* prototypes */
44static void scanelf_file(const char *filename); 18static int file_matches_list(const char *filename, char **matchlist);
19static int scanelf_elfobj(elfobj *elf);
20static int scanelf_elf(const char *filename, int fd, size_t len);
21static int scanelf_archive(const char *filename, int fd, size_t len);
22static int scanelf_file(const char *filename, const struct stat *st_cache);
45static void scanelf_dir(const char *path); 23static int scanelf_dir(const char *path);
46static void scanelf_ldpath(); 24static void scanelf_ldpath(void);
47static void scanelf_envpath(); 25static void scanelf_envpath(void);
48static void usage(int status); 26static void usage(int status);
27static char **get_split_env(const char *envvar);
28static void parseenv(void);
49static void parseargs(int argc, char *argv[]); 29static int parseargs(int argc, char *argv[]);
50static char *xstrdup(char *s); 30static char *xstrdup(const char *s);
51static void *xmalloc(size_t size); 31static void *xmalloc(size_t size);
32static void *xrealloc(void *ptr, size_t size);
52static void xstrcat(char **dst, const char *src, size_t *curr_len); 33static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
34#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
53static inline void xchrcat(char **dst, const char append, size_t *curr_len); 35static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54static int xemptybuffer(const char *buff); 36static int rematch(const char *regex, const char *match, int cflags);
55 37
56/* variables to control behavior */ 38/* variables to control behavior */
39static char match_etypes[126] = "";
40static char *ldpaths[256];
57static char scan_ldpath = 0; 41static char scan_ldpath = 0;
58static char scan_envpath = 0; 42static char scan_envpath = 0;
59static char scan_symlink = 1; 43static char scan_symlink = 1;
44static char scan_archives = 0;
60static char dir_recurse = 0; 45static char dir_recurse = 0;
61static char dir_crossmount = 1; 46static char dir_crossmount = 1;
62static char show_pax = 0; 47static char show_pax = 0;
63static char show_stack = 0; 48static char show_phdr = 0;
64static char show_textrel = 0; 49static char show_textrel = 0;
65static char show_rpath = 0; 50static char show_rpath = 0;
66static char show_needed = 0; 51static char show_needed = 0;
67static char show_interp = 0; 52static char show_interp = 0;
53static char show_bind = 0;
54static char show_soname = 0;
55static char show_textrels = 0;
68static char show_banner = 1; 56static char show_banner = 1;
69static char be_quiet = 0; 57static char be_quiet = 0;
70static char be_verbose = 0; 58static char be_verbose = 0;
59static char be_wewy_wewy_quiet = 0;
60static char be_semi_verbose = 0;
71static char *find_sym = NULL, *versioned_symname = NULL; 61static char *find_sym = NULL, *versioned_symname = NULL;
62static char *find_lib = NULL;
63static char *find_section = NULL;
72static char *out_format = NULL; 64static char *out_format = NULL;
65static char *search_path = NULL;
66static char fix_elf = 0;
67static char g_match = 0;
68static char use_ldcache = 0;
73 69
70static char **qa_textrels = NULL;
71static char **qa_execstack = NULL;
72static char **qa_wx_load = NULL;
74 73
74int match_bits = 0;
75caddr_t ldcache = 0;
76size_t ldcache_size = 0;
77unsigned long setpax = 0UL;
78
79int has_objdump = 0;
80
81/* find the path to a file by name */
82static char *which(const char *fname)
83{
84 static char fullpath[BUFSIZ];
85 char *path, *p;
86
87 path = getenv("PATH");
88 if (!path)
89 return NULL;
90
91 path = xstrdup(path);
92 while ((p = strrchr(path, ':')) != NULL) {
93 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
94 *p = 0;
95 if (access(fullpath, R_OK) != (-1)) {
96 free(path);
97 return (char *) fullpath;
98 }
99 }
100 free(path);
101 return NULL;
102}
103
104/* 1 on failure. 0 otherwise */
105static int rematch(const char *regex, const char *match, int cflags)
106{
107 regex_t preg;
108 int ret;
109
110 if ((match == NULL) || (regex == NULL))
111 return EXIT_FAILURE;
112
113
114 if ((ret = regcomp(&preg, regex, cflags))) {
115 char err[256];
116
117 if (regerror(ret, &preg, err, sizeof(err)))
118 fprintf(stderr, "regcomp failed: %s", err);
119 else
120 fprintf(stderr, "regcomp failed");
121
122 return EXIT_FAILURE;
123 }
124 ret = regexec(&preg, match, 0, NULL, 0);
125 regfree(&preg);
126
127 return ret;
128}
75 129
76/* sub-funcs for scanelf_file() */ 130/* sub-funcs for scanelf_file() */
131static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
132{
133 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
134#define GET_SYMTABS(B) \
135 if (elf->elf_class == ELFCLASS ## B) { \
136 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
137 /* debug sections */ \
138 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
139 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
140 /* runtime sections */ \
141 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
142 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
143 if (symtab && dynsym) { \
144 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
145 } else { \
146 *sym = (void*)(symtab ? symtab : dynsym); \
147 } \
148 if (strtab && dynstr) { \
149 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
150 } else { \
151 *tab = (void*)(strtab ? strtab : dynstr); \
152 } \
153 }
154 GET_SYMTABS(32)
155 GET_SYMTABS(64)
156}
157
77static char *scanelf_file_pax(elfobj *elf, char *found_pax) 158static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{ 159{
79 static char *paxflags; 160 static char ret[7];
161 unsigned long i, shown;
80 162
81 if (!show_pax) return NULL; 163 if (!show_pax) return NULL;
82 164
83 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
84 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
85 *found_pax = 1;
86 return paxflags;
87 }
88
89 return NULL;
90}
91static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
92{
93 static char ret[8];
94 char *found;
95 unsigned long i, off, shown;
96
97 if (!show_stack) return NULL;
98
99 shown = 0; 165 shown = 0;
100 strcpy(ret, "--- ---"); 166 memset(&ret, 0, sizeof(ret));
101 167
102 if (elf->phdr) { 168 if (elf->phdr) {
103#define SHOW_STACK(B) \ 169#define SHOW_PAX(B) \
104 if (elf->elf_class == ELFCLASS ## B) { \ 170 if (elf->elf_class == ELFCLASS ## B) { \
105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 171 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 172 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 173 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ 174 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
109 found = found_stack; \
110 off = 0; \
111 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
112 found = found_relro; \
113 off = 3; \
114 } else \
115 continue; \ 175 continue; \
116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 176 if (fix_elf && setpax) { \
177 /* set the paxctl flags */ \
178 ESET(phdr[i].p_flags, setpax); \
179 } \
180 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
117 continue; \ 181 continue; \
118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ 182 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found = 1; \ 183 *found_pax = 1; \
120 ++shown; \ 184 ++shown; \
185 break; \
121 } \ 186 } \
122 } 187 }
123 SHOW_STACK(32) 188 SHOW_PAX(32)
124 SHOW_STACK(64) 189 SHOW_PAX(64)
190 }
191
192
193 if (fix_elf && setpax) {
194 /* set the chpax settings */
195 if (elf->elf_class == ELFCLASS32) {
196 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
197 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
198 } else {
199 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
200 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
125 } 201 }
202 }
126 203
127 if (be_quiet && !shown) 204 /* fall back to EI_PAX if no PT_PAX was found */
205 if (!*ret) {
206 static char *paxflags;
207 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
208 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
209 *found_pax = 1;
210 return (be_wewy_wewy_quiet ? NULL : paxflags);
211 }
212 strncpy(ret, paxflags, sizeof(ret));
213 }
214
215 if (be_wewy_wewy_quiet || (be_quiet && !shown))
128 return NULL; 216 return NULL;
129 else 217 else
130 return ret; 218 return ret;
131} 219}
220
221static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
222{
223 static char ret[12];
224 char *found;
225 unsigned long i, shown, multi_stack, multi_relro, multi_load;
226 int max_pt_load;
227
228 if (!show_phdr) return NULL;
229
230 memcpy(ret, "--- --- ---\0", 12);
231
232 shown = 0;
233 multi_stack = multi_relro = multi_load = 0;
234 max_pt_load = elf_max_pt_load(elf);
235
236#define NOTE_GNU_STACK ".note.GNU-stack"
237#define SHOW_PHDR(B) \
238 if (elf->elf_class == ELFCLASS ## B) { \
239 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
240 Elf ## B ## _Off offset; \
241 uint32_t flags, check_flags; \
242 if (elf->phdr != NULL) { \
243 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
244 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
245 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
246 if (multi_stack++) \
247 warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
248 if (file_matches_list(elf->filename, qa_execstack)) \
249 continue; \
250 found = found_phdr; \
251 offset = 0; \
252 check_flags = PF_X; \
253 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
254 if (multi_relro++) \
255 warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
256 found = found_relro; \
257 offset = 4; \
258 check_flags = PF_X; \
259 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
260 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
261 if (multi_load++ > max_pt_load) \
262 warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
263 if (file_matches_list(elf->filename, qa_wx_load)) \
264 continue; \
265 found = found_load; \
266 offset = 8; \
267 check_flags = PF_W|PF_X; \
268 } else \
269 continue; \
270 flags = EGET(phdr[i].p_flags); \
271 if (be_quiet && ((flags & check_flags) != check_flags)) \
272 continue; \
273 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
274 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
275 ret[3] = ret[7] = '!'; \
276 flags = EGET(phdr[i].p_flags); \
277 } \
278 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
279 *found = 1; \
280 ++shown; \
281 } \
282 } else if (elf->shdr != NULL) { \
283 /* no program headers which means this is prob an object file */ \
284 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
285 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
286 char *str; \
287 if ((void*)strtbl > (void*)elf->data_end) \
288 goto skip_this_shdr##B; \
289 check_flags = SHF_WRITE|SHF_EXECINSTR; \
290 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
291 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
292 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
293 str = elf->data + offset; \
294 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
295 if (!strcmp(str, NOTE_GNU_STACK)) { \
296 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
297 flags = EGET(shdr[i].sh_flags); \
298 if (be_quiet && ((flags & check_flags) != check_flags)) \
299 continue; \
300 ++*found_phdr; \
301 shown = 1; \
302 if (flags & SHF_WRITE) ret[0] = 'W'; \
303 if (flags & SHF_ALLOC) ret[1] = 'A'; \
304 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
305 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
306 break; \
307 } \
308 } \
309 skip_this_shdr##B: \
310 if (!multi_stack) { \
311 if (file_matches_list(elf->filename, qa_execstack)) \
312 return NULL; \
313 *found_phdr = 1; \
314 shown = 1; \
315 memcpy(ret, "!WX", 3); \
316 } \
317 } \
318 }
319 SHOW_PHDR(32)
320 SHOW_PHDR(64)
321
322 if (be_wewy_wewy_quiet || (be_quiet && !shown))
323 return NULL;
324 else
325 return ret;
326}
327
132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) 328static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
133{ 329{
134 static char *ret = "TEXTREL"; 330 static const char *ret = "TEXTREL";
135 unsigned long i; 331 unsigned long i;
136 332
137 if (!show_textrel) return NULL; 333 if (!show_textrel && !show_textrels) return NULL;
334
335 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
138 336
139 if (elf->phdr) { 337 if (elf->phdr) {
140#define SHOW_TEXTREL(B) \ 338#define SHOW_TEXTREL(B) \
141 if (elf->elf_class == ELFCLASS ## B) { \ 339 if (elf->elf_class == ELFCLASS ## B) { \
142 Elf ## B ## _Dyn *dyn; \ 340 Elf ## B ## _Dyn *dyn; \
143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 341 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 342 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \ 343 Elf ## B ## _Off offset; \
146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 344 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
147 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 345 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
148 offset = EGET(phdr[i].p_offset); \ 346 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 347 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
150 dyn = DYN ## B (elf->data + offset); \ 348 dyn = DYN ## B (elf->data + offset); \
151 while (EGET(dyn->d_tag) != DT_NULL) { \ 349 while (EGET(dyn->d_tag) != DT_NULL) { \
152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 350 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
153 *found_textrel = 1; \ 351 *found_textrel = 1; \
154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 352 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
155 return ret; \ 353 return (be_wewy_wewy_quiet ? NULL : ret); \
156 } \ 354 } \
157 ++dyn; \ 355 ++dyn; \
158 } \ 356 } \
159 } } 357 } }
160 SHOW_TEXTREL(32) 358 SHOW_TEXTREL(32)
161 SHOW_TEXTREL(64) 359 SHOW_TEXTREL(64)
162 } 360 }
163 361
164 if (be_quiet) 362 if (be_quiet || be_wewy_wewy_quiet)
165 return NULL; 363 return NULL;
166 else 364 else
167 return " - "; 365 return " - ";
168} 366}
367static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
368{
369 unsigned long s, r, rmax;
370 void *symtab_void, *strtab_void, *text_void;
371
372 if (!show_textrels) return NULL;
373
374 /* don't search for TEXTREL's if the ELF doesn't have any */
375 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
376 if (!*found_textrel) return NULL;
377
378 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
379 text_void = elf_findsecbyname(elf, ".text");
380
381 if (symtab_void && strtab_void && text_void && elf->shdr) {
382#define SHOW_TEXTRELS(B) \
383 if (elf->elf_class == ELFCLASS ## B) { \
384 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
385 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
386 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
387 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
388 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
389 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
390 uint ## B ## _t memsz = EGET(text->sh_size); \
391 Elf ## B ## _Rel *rel; \
392 Elf ## B ## _Rela *rela; \
393 /* search the section headers for relocations */ \
394 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
395 uint32_t sh_type = EGET(shdr[s].sh_type); \
396 if (sh_type == SHT_REL) { \
397 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
398 rela = NULL; \
399 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
400 } else if (sh_type == SHT_RELA) { \
401 rel = NULL; \
402 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
403 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
404 } else \
405 continue; \
406 /* now see if any of the relocs are in the .text */ \
407 for (r = 0; r < rmax; ++r) { \
408 unsigned long sym_max; \
409 Elf ## B ## _Addr offset_tmp; \
410 Elf ## B ## _Sym *func; \
411 Elf ## B ## _Sym *sym; \
412 Elf ## B ## _Addr r_offset; \
413 uint ## B ## _t r_info; \
414 if (sh_type == SHT_REL) { \
415 r_offset = EGET(rel[r].r_offset); \
416 r_info = EGET(rel[r].r_info); \
417 } else { \
418 r_offset = EGET(rela[r].r_offset); \
419 r_info = EGET(rela[r].r_info); \
420 } \
421 /* make sure this relocation is inside of the .text */ \
422 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
423 if (be_verbose <= 2) continue; \
424 } else \
425 *found_textrels = 1; \
426 /* locate this relocation symbol name */ \
427 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
428 if ((void*)sym > (void*)elf->data_end) { \
429 warn("%s: corrupt ELF symbol", elf->filename); \
430 continue; \
431 } \
432 sym_max = ELF ## B ## _R_SYM(r_info); \
433 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
434 sym += sym_max; \
435 else \
436 sym = NULL; \
437 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
438 /* show the raw details about this reloc */ \
439 printf(" %s: ", elf->base_filename); \
440 if (sym && sym->st_name) \
441 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
442 else \
443 printf("(memory/data?)"); \
444 printf(" [0x%lX]", (unsigned long)r_offset); \
445 /* now try to find the closest symbol that this rel is probably in */ \
446 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
447 func = NULL; \
448 offset_tmp = 0; \
449 while (sym_max--) { \
450 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
451 func = sym; \
452 offset_tmp = EGET(sym->st_value); \
453 } \
454 ++sym; \
455 } \
456 printf(" in "); \
457 if (func && func->st_name) { \
458 const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
459 if (r_offset > EGET(func->st_size)) \
460 printf("(optimized out: previous %s)", func_name); \
461 else \
462 printf("%s", func_name); \
463 } else \
464 printf("(optimized out)"); \
465 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
466 if (be_verbose && has_objdump) { \
467 char *sysbuf; \
468 size_t syslen; \
469 const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
470 syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
471 sysbuf = xmalloc(syslen); \
472 if (sysbuf) { \
473 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
474 if (end_addr < r_offset) \
475 /* not uncommon when things are optimized out */ \
476 end_addr = r_offset + 0x100; \
477 snprintf(sysbuf, syslen, sysfmt, \
478 (unsigned long)offset_tmp, \
479 (unsigned long)end_addr, \
480 elf->filename, \
481 (unsigned long)r_offset); \
482 fflush(stdout); \
483 system(sysbuf); \
484 fflush(stdout); \
485 free(sysbuf); \
486 } \
487 } \
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, (unsigned int) st.st_mode & 07777);
517 break;
518 default:
519 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
520 break;
521 }
522}
169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) 523static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
170{ 524{
171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
172 unsigned long i; 525 unsigned long i, s;
173 char *rpath, *runpath; 526 char *rpath, *runpath, **r;
174 void *strtbl_void; 527 void *strtbl_void;
175 528
176 if (!show_rpath) return; 529 if (!show_rpath) return;
177 530
178 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 531 strtbl_void = elf_findsecbyname(elf, ".dynstr");
184 Elf ## B ## _Dyn *dyn; \ 537 Elf ## B ## _Dyn *dyn; \
185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 538 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 539 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 540 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \ 541 Elf ## B ## _Off offset; \
542 Elf ## B ## _Xword word; \
543 /* Scan all the program headers */ \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 544 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
545 /* Just scan dynamic headers */ \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 546 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
191 offset = EGET(phdr[i].p_offset); \ 547 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 548 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
549 /* Just scan dynamic RPATH/RUNPATH headers */ \
193 dyn = DYN ## B (elf->data + offset); \ 550 dyn = DYN ## B (elf->data + offset); \
194 while (EGET(dyn->d_tag) != DT_NULL) { \ 551 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
195 if (EGET(dyn->d_tag) == DT_RPATH) { \ 552 if (word == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \ 553 r = &rpath; \
554 } else if (word == DT_RUNPATH) { \
555 r = &runpath; \
556 } else { \
557 ++dyn; \
558 continue; \
559 } \
560 /* Verify the memory is somewhat sane */ \
197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 561 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \ 562 if (offset < (Elf ## B ## _Off)elf->len) { \
563 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
199 rpath = (char*)(elf->data + offset); \ 564 *r = (char*)(elf->data + offset); \
565 /* cache the length in case we need to nuke this section later on */ \
566 if (fix_elf) \
567 offset = strlen(*r); \
568 /* If quiet, don't output paths in ld.so.conf */ \
569 if (be_quiet) { \
570 size_t len; \
571 char *start, *end; \
572 /* note that we only 'chop' off leading known paths. */ \
573 /* since *r is read-only memory, we can only move the ptr forward. */ \
574 start = *r; \
575 /* scan each path in : delimited list */ \
576 while (start) { \
577 rpath_security_checks(elf, start, get_elfdtype(word)); \
578 end = strchr(start, ':'); \
579 len = (end ? abs(end - start) : strlen(start)); \
580 if (use_ldcache) \
581 for (s = 0; ldpaths[s]; ++s) \
582 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
583 *r = end; \
584 /* corner case ... if RPATH reads "/usr/lib:", we want \
585 * to show ':' rather than '' */ \
586 if (end && end[1] != '\0') \
587 (*r)++; \
588 break; \
589 } \
590 if (!*r || !end) \
591 break; \
592 else \
593 start = start + len + 1; \
594 } \
595 } \
596 if (*r) { \
597 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
598 /* just nuke it */ \
599 nuke_it##B: \
600 memset(*r, 0x00, offset); \
601 *r = NULL; \
602 ESET(dyn->d_tag, DT_DEBUG); \
603 ESET(dyn->d_un.d_ptr, 0); \
604 } else if (fix_elf) { \
605 /* try to clean "bad" paths */ \
606 size_t len, tmpdir_len; \
607 char *start, *end; \
608 const char *tmpdir; \
609 start = *r; \
610 tmpdir = (getenv("TMPDIR") ? : "."); \
611 tmpdir_len = strlen(tmpdir); \
612 while (1) { \
613 end = strchr(start, ':'); \
614 if (start == end) { \
615 eat_this_path##B: \
616 len = strlen(end); \
617 memmove(start, end+1, len); \
618 start[len-1] = '\0'; \
619 end = start - 1; \
620 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
621 if (!end) { \
622 if (start == *r) \
623 goto nuke_it##B; \
624 *--start = '\0'; \
625 } else \
626 goto eat_this_path##B; \
627 } \
628 if (!end) \
629 break; \
630 start = end + 1; \
631 } \
632 if (**r == '\0') \
633 goto nuke_it##B; \
634 } \
635 if (*r) \
200 *found_rpath = 1; \ 636 *found_rpath = 1; \
201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 637 } \
202 if (runpath) warn("ELF has multiple DT_RUNPATH's !?"); \
203 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
204 if (offset >= elf->len) continue; \
205 runpath = (char*)(elf->data + offset); \
206 *found_rpath = 1; \
207 } \ 638 } \
208 ++dyn; \ 639 ++dyn; \
209 } \ 640 } \
210 } } 641 } }
211 SHOW_RPATH(32) 642 SHOW_RPATH(32)
212 SHOW_RPATH(64) 643 SHOW_RPATH(64)
213 } 644 }
645
646 if (be_wewy_wewy_quiet) return;
214 647
215 if (rpath && runpath) { 648 if (rpath && runpath) {
216 if (!strcmp(rpath, runpath)) { 649 if (!strcmp(rpath, runpath)) {
217 xstrcat(ret, runpath, ret_len); 650 xstrcat(ret, runpath, ret_len);
218 } else { 651 } else {
226 } else if (rpath || runpath) 659 } else if (rpath || runpath)
227 xstrcat(ret, (runpath ? runpath : rpath), ret_len); 660 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
228 else if (!be_quiet) 661 else if (!be_quiet)
229 xstrcat(ret, " - ", ret_len); 662 xstrcat(ret, " - ", ret_len);
230} 663}
664
665#define LDSO_CACHE_MAGIC "ld.so-"
666#define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
667#define LDSO_CACHE_VER "1.7.0"
668#define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
669#define FLAG_ANY -1
670#define FLAG_TYPE_MASK 0x00ff
671#define FLAG_LIBC4 0x0000
672#define FLAG_ELF 0x0001
673#define FLAG_ELF_LIBC5 0x0002
674#define FLAG_ELF_LIBC6 0x0003
675#define FLAG_REQUIRED_MASK 0xff00
676#define FLAG_SPARC_LIB64 0x0100
677#define FLAG_IA64_LIB64 0x0200
678#define FLAG_X8664_LIB64 0x0300
679#define FLAG_S390_LIB64 0x0400
680#define FLAG_POWERPC_LIB64 0x0500
681#define FLAG_MIPS64_LIBN32 0x0600
682#define FLAG_MIPS64_LIBN64 0x0700
683
684static char *lookup_cache_lib(elfobj *, char *);
685
686#if defined(__GLIBC__) || defined(__UCLIBC__)
687
688static char *lookup_cache_lib(elfobj *elf, char *fname)
689{
690 int fd = 0;
691 char *strs;
692 static char buf[__PAX_UTILS_PATH_MAX] = "";
693 const char *cachefile = "/etc/ld.so.cache";
694 struct stat st;
695
696 typedef struct {
697 char magic[LDSO_CACHE_MAGIC_LEN];
698 char version[LDSO_CACHE_VER_LEN];
699 int nlibs;
700 } header_t;
701 header_t *header;
702
703 typedef struct {
704 int flags;
705 int sooffset;
706 int liboffset;
707 } libentry_t;
708 libentry_t *libent;
709
710 if (fname == NULL)
711 return NULL;
712
713 if (ldcache == 0) {
714 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
715 return NULL;
716
717 /* cache these values so we only map/unmap the cache file once */
718 ldcache_size = st.st_size;
719 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
720
721 close(fd);
722
723 if (ldcache == (caddr_t)-1) {
724 ldcache = 0;
725 return NULL;
726 }
727
728 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
729 return NULL;
730 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
731 return NULL;
732 }
733
734 header = (header_t *) ldcache;
735 libent = (libentry_t *) (ldcache + sizeof(header_t));
736 strs = (char *) &libent[header->nlibs];
737
738 for (fd = 0; fd < header->nlibs; fd++) {
739 /* this should be more fine grained, but for now we assume that
740 * diff arches will not be cached together. and we ignore the
741 * the different multilib mips cases. */
742 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
743 continue;
744 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
745 continue;
746
747 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
748 continue;
749 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
750 }
751 return buf;
752}
753#elif defined(__NetBSD__)
754static char *lookup_cache_lib(elfobj *elf, char *fname)
755{
756 static char buf[__PAX_UTILS_PATH_MAX] = "";
757 static struct stat st;
758
759 char **ldpath;
760 for (ldpath = ldpaths; *ldpath != NULL; ldpath++) {
761 if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", *ldpath, fname) >= sizeof(buf))
762 continue; /* if the pathname is too long, or something went wrong, ignore */
763
764 if (stat(buf, &st) != 0)
765 continue; /* if the lib doesn't exist in *ldpath, look further */
766
767 /* NetBSD doesn't actually do sanity checks, it just loads the file
768 * and if that doesn't work, continues looking in other directories.
769 * This cannot easily be safely emulated, unfortunately. For now,
770 * just assume that if it exists, it's a valid library. */
771
772 return buf;
773 }
774
775 /* not found in any path */
776 return NULL;
777}
778#else
779#warning Cache support not implemented for your target
780static char *lookup_cache_lib(elfobj *elf, char *fname)
781{
782 return NULL;
783}
784#endif
785
231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) 786static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
232{ 787{
233 unsigned long i; 788 unsigned long i;
234 char *needed; 789 char *needed;
235 void *strtbl_void; 790 void *strtbl_void;
791 char *p;
236 792
237 if (!show_needed) return; 793 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
238 794
239 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 795 strtbl_void = elf_findsecbyname(elf, ".dynstr");
240 796
241 if (elf->phdr && strtbl_void) { 797 if (elf->phdr && strtbl_void) {
242#define SHOW_NEEDED(B) \ 798#define SHOW_NEEDED(B) \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ 808 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
253 dyn = DYN ## B (elf->data + offset); \ 809 dyn = DYN ## B (elf->data + offset); \
254 while (EGET(dyn->d_tag) != DT_NULL) { \ 810 while (EGET(dyn->d_tag) != DT_NULL) { \
255 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 811 if (EGET(dyn->d_tag) == DT_NEEDED) { \
256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 812 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
257 if (offset >= elf->len) continue; \ 813 if (offset >= (Elf ## B ## _Off)elf->len) { \
814 ++dyn; \
815 continue; \
816 } \
258 needed = (char*)(elf->data + offset); \ 817 needed = (char*)(elf->data + offset); \
818 if (op == 0) { \
819 if (!be_wewy_wewy_quiet) { \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \ 820 if (*found_needed) xchrcat(ret, ',', ret_len); \
821 if (use_ldcache) \
822 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
823 needed = p; \
260 xstrcat(ret, needed, ret_len); \ 824 xstrcat(ret, needed, ret_len); \
825 } \
261 *found_needed = 1; \ 826 *found_needed = 1; \
827 } else { \
828 if (!strncmp(find_lib, needed, strlen( !g_match ? needed : find_lib))) { \
829 *found_lib = 1; \
830 return (be_wewy_wewy_quiet ? NULL : needed); \
831 } \
832 } \
262 } \ 833 } \
263 ++dyn; \ 834 ++dyn; \
264 } \ 835 } \
265 } } 836 } }
266 SHOW_NEEDED(32) 837 SHOW_NEEDED(32)
267 SHOW_NEEDED(64) 838 SHOW_NEEDED(64)
839 if (op == 0 && !*found_needed && be_verbose)
840 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
268 } 841 }
842
843 return NULL;
269} 844}
270static char *scanelf_file_interp(elfobj *elf, char *found_interp) 845static char *scanelf_file_interp(elfobj *elf, char *found_interp)
271{ 846{
272 void *strtbl_void; 847 void *strtbl_void;
273 848
278 if (strtbl_void) { 853 if (strtbl_void) {
279#define SHOW_INTERP(B) \ 854#define SHOW_INTERP(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \ 855 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 856 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
282 *found_interp = 1; \ 857 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \ 858 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
284 } 859 }
285 SHOW_INTERP(32) 860 SHOW_INTERP(32)
286 SHOW_INTERP(64) 861 SHOW_INTERP(64)
287 } 862 }
288 return NULL; 863 return NULL;
289} 864}
290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 865static char *scanelf_file_bind(elfobj *elf, char *found_bind)
291{ 866{
292 unsigned long i; 867 unsigned long i;
868 struct stat s;
869 char dynamic = 0;
870
871 if (!show_bind) return NULL;
872 if (!elf->phdr) return NULL;
873
874#define SHOW_BIND(B) \
875 if (elf->elf_class == ELFCLASS ## B) { \
876 Elf ## B ## _Dyn *dyn; \
877 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
878 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
879 Elf ## B ## _Off offset; \
880 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
881 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
882 dynamic = 1; \
883 offset = EGET(phdr[i].p_offset); \
884 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
885 dyn = DYN ## B (elf->data + offset); \
886 while (EGET(dyn->d_tag) != DT_NULL) { \
887 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
888 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
889 { \
890 if (be_quiet) return NULL; \
891 *found_bind = 1; \
892 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
893 } \
894 ++dyn; \
895 } \
896 } \
897 }
898 SHOW_BIND(32)
899 SHOW_BIND(64)
900
901 if (be_wewy_wewy_quiet) return NULL;
902
903 /* don't output anything if quiet mode and the ELF is static or not setuid */
904 if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
905 return NULL;
906 } else {
907 *found_bind = 1;
908 return (char *) (dynamic ? "LAZY" : "STATIC");
909 }
910}
911static char *scanelf_file_soname(elfobj *elf, char *found_soname)
912{
913 unsigned long i;
914 char *soname;
915 void *strtbl_void;
916
917 if (!show_soname) return NULL;
918
919 strtbl_void = elf_findsecbyname(elf, ".dynstr");
920
921 if (elf->phdr && strtbl_void) {
922#define SHOW_SONAME(B) \
923 if (elf->elf_class == ELFCLASS ## B) { \
924 Elf ## B ## _Dyn *dyn; \
925 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
926 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
927 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
928 Elf ## B ## _Off offset; \
929 /* only look for soname in shared objects */ \
930 if (ehdr->e_type != ET_DYN) \
931 return NULL; \
932 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
933 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
934 offset = EGET(phdr[i].p_offset); \
935 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
936 dyn = DYN ## B (elf->data + offset); \
937 while (EGET(dyn->d_tag) != DT_NULL) { \
938 if (EGET(dyn->d_tag) == DT_SONAME) { \
939 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
940 if (offset >= (Elf ## B ## _Off)elf->len) { \
941 ++dyn; \
942 continue; \
943 } \
944 soname = (char*)(elf->data + offset); \
945 *found_soname = 1; \
946 return (be_wewy_wewy_quiet ? NULL : soname); \
947 } \
948 ++dyn; \
949 } \
950 } }
951 SHOW_SONAME(32)
952 SHOW_SONAME(64)
953 }
954
955 return NULL;
956}
957static char *scanelf_file_sym(elfobj *elf, char *found_sym)
958{
959 unsigned long i;
960 char *ret;
293 void *symtab_void, *strtab_void; 961 void *symtab_void, *strtab_void;
294 962
295 if (!find_sym) return NULL; 963 if (!find_sym) return NULL;
964 ret = find_sym;
296 965
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 966 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 967
300 if (symtab_void && strtab_void) { 968 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 969#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 970 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 971 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 972 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 973 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 974 unsigned long cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 975 char *symname; \
976 if (cnt) \
977 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 978 for (i = 0; i < cnt; ++i) { \
309 if (sym->st_name) { \ 979 if (sym->st_name) { \
980 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 981 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
311 if (*find_sym == '*') { \ 982 if ((void*)symname > (void*)elf->data_end) { \
983 warnf("%s: corrupt ELF symbols", elf->filename); \
984 ++sym; \
985 continue; \
986 } \
987 /* debug display ... show all symbols and some extra info */ \
988 if (g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
312 printf("%s(%s) %5lX %15s %s\n", \ 989 printf("%s(%s) %5lX %15s %s\n", \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 990 ((*found_sym == 0) ? "\n\t" : "\t"), \
314 (char *)basename(filename), \ 991 elf->base_filename, \
315 (long)sym->st_size, \ 992 (unsigned long)sym->st_size, \
316 (char *)get_elfstttype(sym->st_info), \ 993 get_elfstttype(sym->st_info), \
317 symname); \ 994 symname); \
318 *found_sym = 1; \ 995 *found_sym = 1; \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 996 } else { \
320 (strcmp(symname, versioned_symname) == 0)) \ 997 /* allow the user to specify a comma delimited list of symbols to search for */ \
998 char *this_sym, *this_sym_ver, *next_sym; \
999 this_sym = ret; \
1000 this_sym_ver = versioned_symname; \
1001 do { \
1002 next_sym = strchr(this_sym, ','); \
1003 if (next_sym == NULL) \
1004 next_sym = this_sym + strlen(this_sym); \
1005 /* do we want a defined symbol ? */ \
1006 if (*this_sym == '+') { \
1007 if (sym->st_shndx == SHN_UNDEF) \
1008 goto skip_this_sym##B; \
1009 ++this_sym; \
1010 ++this_sym_ver; \
1011 /* do we want an undefined symbol ? */ \
1012 } else if (*this_sym == '-') { \
1013 if (sym->st_shndx != SHN_UNDEF) \
1014 goto skip_this_sym##B; \
1015 ++this_sym; \
1016 ++this_sym_ver; \
1017 } \
1018 /* ok, lets compare the name now */ \
1019 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
1020 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
1021 if (be_semi_verbose) { \
1022 char buf[126]; \
1023 snprintf(buf, sizeof(buf), "%lX %s %s", \
1024 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1025 ret = buf; \
1026 } else \
1027 ret = this_sym; \
321 (*found_sym)++; \ 1028 (*found_sym)++; \
1029 goto break_out; \
1030 } \
1031 skip_this_sym##B: this_sym = next_sym + 1; \
1032 } while (*next_sym != '\0'); \
1033 } \
322 } \ 1034 } \
323 ++sym; \ 1035 ++sym; \
324 } } 1036 } }
325 FIND_SYM(32) 1037 FIND_SYM(32)
326 FIND_SYM(64) 1038 FIND_SYM(64)
327 } 1039 }
1040
1041break_out:
1042 if (be_wewy_wewy_quiet) return NULL;
1043
328 if (*find_sym != '*' && *found_sym) 1044 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1045 return ret;
330 if (be_quiet) 1046 if (be_quiet)
331 return NULL; 1047 return NULL;
332 else 1048 else
333 return " - "; 1049 return (char *)" - ";
334} 1050}
1051
1052
1053static char *scanelf_file_sections(elfobj *elf, char *found_section)
1054{
1055 if (!find_section)
1056 return NULL;
1057
1058#define FIND_SECTION(B) \
1059 if (elf->elf_class == ELFCLASS ## B) { \
1060 int invert; \
1061 Elf ## B ## _Shdr *section; \
1062 invert = (*find_section == '!' ? 1 : 0); \
1063 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1064 if ((section == NULL && invert) || (section != NULL && !invert)) \
1065 *found_section = 1; \
1066 }
1067 FIND_SECTION(32)
1068 FIND_SECTION(64)
1069
1070 if (be_wewy_wewy_quiet)
1071 return NULL;
1072
1073 if (*found_section)
1074 return find_section;
1075
1076 if (be_quiet)
1077 return NULL;
1078 else
1079 return (char *)" - ";
1080}
1081
335/* scan an elf file and show all the fun stuff */ 1082/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1083#define prints(str) write(fileno(stdout), str, strlen(str))
337static void scanelf_file(const char *filename) 1084static int scanelf_elfobj(elfobj *elf)
338{ 1085{
339 unsigned long i; 1086 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1087 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1088 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1089 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1090 static char *out_buffer = NULL;
346 static size_t out_len; 1091 static size_t out_len;
347 1092
348 /* make sure 'filename' exists */
349 if (lstat(filename, &st) == -1) {
350 if (be_verbose > 2) printf("%s: does not exist\n", filename);
351 return;
352 }
353 /* always handle regular files and handle symlinked files if no -y */
354 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
355 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
356 return;
357 }
358
359 found_pax = found_stack = found_relro = found_textrel = \ 1093 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1094 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1095 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1096
363 /* verify this is real ELF */
364 if ((elf = readelf(filename)) == NULL) {
365 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
366 return;
367 }
368
369 if (be_verbose > 1) 1097 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1098 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1099 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1100 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1101 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1102 printf("%s: scanning file\n", elf->filename);
375 1103
376 /* init output buffer */ 1104 /* init output buffer */
377 if (!out_buffer) { 1105 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1106 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1107 out_buffer = (char*)xmalloc(out_len);
380 } 1108 }
381 *out_buffer = '\0'; 1109 *out_buffer = '\0';
382 1110
383 /* show the header */ 1111 /* show the header */
384 if (!be_quiet && show_banner) { 1112 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1113 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1114 if (!IS_MODIFIER(out_format[i])) continue;
387 1115
388 switch (out_format[++i]) { 1116 switch (out_format[++i]) {
1117 case '+': break;
389 case '%': break; 1118 case '%': break;
1119 case '#': break;
1120 case 'F':
1121 case 'p':
390 case 'F': prints("FILE "); break; 1122 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1123 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1124 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1125 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1126 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1127 case 'r': prints("RPATH "); break;
1128 case 'M': prints("CLASS "); break;
396 case 'n': prints("NEEDED "); break; 1129 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1130 case 'i': prints("INTERP "); break;
1131 case 'b': prints("BIND "); break;
1132 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1133 case 's': prints("SYM "); break;
1134 case 'N': prints("LIB "); break;
1135 case 'T': prints("TEXTRELS "); break;
1136 case 'k': prints("SECTION "); break;
1137 case 'a': prints("ARCH "); break;
1138 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1139 }
400 } 1140 }
1141 if (!found_file) prints("FILE ");
401 prints("\n"); 1142 prints("\n");
1143 found_file = 0;
402 show_banner = 0; 1144 show_banner = 0;
403 } 1145 }
404 1146
405 /* dump all the good stuff */ 1147 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1148 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1149 const char *out;
1150 const char *tmp;
408 1151
409 /* make sure we trim leading spaces in quiet mode */ 1152 if (!IS_MODIFIER(out_format[i])) {
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
411 *out_buffer = '\0';
412
413 if (out_format[i] != '%') {
414 xchrcat(&out_buffer, out_format[i], &out_len); 1153 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1154 continue;
416 } 1155 }
417 1156
418 out = NULL; 1157 out = NULL;
1158 be_wewy_wewy_quiet = (out_format[i] == '#');
1159 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1160 switch (out_format[++i]) {
1161 case '+':
1162 case '%':
1163 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1164 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1165 case 'F':
1166 found_file = 1;
1167 if (be_wewy_wewy_quiet) break;
1168 xstrcat(&out_buffer, elf->filename, &out_len);
1169 break;
1170 case 'p':
1171 found_file = 1;
1172 if (be_wewy_wewy_quiet) break;
1173 tmp = elf->filename;
1174 if (search_path) {
1175 ssize_t len_search = strlen(search_path);
1176 ssize_t len_file = strlen(elf->filename);
1177 if (!strncmp(elf->filename, search_path, len_search) && \
1178 len_file > len_search)
1179 tmp += len_search;
1180 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1181 }
1182 xstrcat(&out_buffer, tmp, &out_len);
1183 break;
1184 case 'f':
1185 found_file = 1;
1186 if (be_wewy_wewy_quiet) break;
1187 tmp = strrchr(elf->filename, '/');
1188 tmp = (tmp == NULL ? elf->filename : tmp+1);
1189 xstrcat(&out_buffer, tmp, &out_len);
1190 break;
422 case 'o': out = get_elfetype(elf); break; 1191 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1192 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1193 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
425 case 't': out = scanelf_file_textrel(elf, &found_textrel); break; 1194 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1195 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
426 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; 1196 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1197 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1198 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1199 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
428 case 'i': out = scanelf_file_interp(elf, &found_interp); break; 1200 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1201 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1202 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1203 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1204 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1205 case 'a': out = get_elfemtype(elf); break;
1206 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1207 }
1208 if (out) {
1209 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1210 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1211 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1212 else
431 if (out) xstrcat(&out_buffer, out, &out_len); 1213 xstrcat(&out_buffer, out, &out_len);
432 } 1214 }
1215 }
433 1216
434 if (!found_file) { 1217#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1218 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1219 found_rpath || found_needed || found_interp || found_bind || \
1220 found_soname || found_sym || found_lib || found_textrels || found_section )
1221
1222 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1223 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1224 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1225 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1226 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1227 puts(out_buffer);
1228 fflush(stdout);
1229 }
441 1230
1231 return 0;
1232}
1233
1234/* scan a single elf */
1235static int scanelf_elf(const char *filename, int fd, size_t len)
1236{
1237 int ret = 1;
1238 elfobj *elf;
1239
1240 /* verify this is real ELF */
1241 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1242 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1243 return ret;
1244 }
1245 switch (match_bits) {
1246 case 32:
1247 if (elf->elf_class != ELFCLASS32)
1248 goto label_done;
1249 break;
1250 case 64:
1251 if (elf->elf_class != ELFCLASS64)
1252 goto label_done;
1253 break;
1254 default: break;
1255 }
1256 if (strlen(match_etypes)) {
1257 char sbuf[126];
1258 strncpy(sbuf, match_etypes, sizeof(sbuf));
1259 if (strchr(match_etypes, ',') != NULL) {
1260 char *p;
1261 while((p = strrchr(sbuf, ',')) != NULL) {
1262 *p = 0;
1263 if (etype_lookup(p+1) == get_etype(elf))
1264 goto label_ret;
1265 }
1266 }
1267 if (etype_lookup(sbuf) != get_etype(elf))
1268 goto label_done;
1269 }
1270
1271label_ret:
1272 ret = scanelf_elfobj(elf);
1273
1274label_done:
442 unreadelf(elf); 1275 unreadelf(elf);
1276 return ret;
1277}
1278
1279/* scan an archive of elfs */
1280static int scanelf_archive(const char *filename, int fd, size_t len)
1281{
1282 archive_handle *ar;
1283 archive_member *m;
1284 char *ar_buffer;
1285 elfobj *elf;
1286
1287 ar = ar_open_fd(filename, fd);
1288 if (ar == NULL)
1289 return 1;
1290
1291 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1292 while ((m=ar_next(ar)) != NULL) {
1293 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1294 if (elf) {
1295 scanelf_elfobj(elf);
1296 unreadelf(elf);
1297 }
1298 }
1299 munmap(ar_buffer, len);
1300
1301 return 0;
1302}
1303/* scan a file which may be an elf or an archive or some other magical beast */
1304static int scanelf_file(const char *filename, const struct stat *st_cache)
1305{
1306 const struct stat *st = st_cache;
1307 struct stat symlink_st;
1308 int fd;
1309
1310 /* always handle regular files and handle symlinked files if no -y */
1311 if (S_ISLNK(st->st_mode)) {
1312 if (!scan_symlink) return 1;
1313 stat(filename, &symlink_st);
1314 st = &symlink_st;
1315 }
1316
1317 if (!S_ISREG(st->st_mode)) {
1318 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1319 return 1;
1320 }
1321
1322 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1323 return 1;
1324
1325 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1326 /* if it isn't an ELF, maybe it's an .a archive */
1327 scanelf_archive(filename, fd, st->st_size);
1328
1329 close(fd);
1330 return 0;
443} 1331}
444 1332
445/* scan a directory for ET_EXEC files and print when we find one */ 1333/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1334static int scanelf_dir(const char *path)
447{ 1335{
448 register DIR *dir; 1336 register DIR *dir;
449 register struct dirent *dentry; 1337 register struct dirent *dentry;
450 struct stat st_top, st; 1338 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1339 char buf[__PAX_UTILS_PATH_MAX];
452 size_t pathlen = 0, len = 0; 1340 size_t pathlen = 0, len = 0;
1341 int ret = 0;
453 1342
454 /* make sure path exists */ 1343 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1344 if (lstat(path, &st_top) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1345 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1346 return 1;
458 } 1347 }
459 1348
460 /* ok, if it isn't a directory, assume we can open it */ 1349 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1350 if (!S_ISDIR(st_top.st_mode)) {
462 scanelf_file(path); 1351 return scanelf_file(path, &st_top);
463 return;
464 } 1352 }
465 1353
466 /* now scan the dir looking for fun stuff */ 1354 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1355 if ((dir = opendir(path)) == NULL) {
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1356 warnf("could not opendir %s: %s", path, strerror(errno));
469 return; 1357 return 1;
470 } 1358 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1359 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1360
473 pathlen = strlen(path); 1361 pathlen = strlen(path);
474 while ((dentry = readdir(dir))) { 1362 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1363 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1364 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1365 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
478 if (len >= sizeof(buf)) { 1366 if (len >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1367 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1368 (unsigned long)len, (unsigned long)sizeof(buf));
480 continue; 1369 continue;
481 } 1370 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1371 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
483 if (lstat(buf, &st) != -1) { 1372 if (lstat(buf, &st) != -1) {
484 if (S_ISREG(st.st_mode)) 1373 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1374 ret = scanelf_file(buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1375 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1376 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1377 ret = scanelf_dir(buf);
489 } 1378 }
490 } 1379 }
491 } 1380 }
492 closedir(dir); 1381 closedir(dir);
1382 return ret;
493} 1383}
1384
1385static int scanelf_from_file(const char *filename)
1386{
1387 FILE *fp = NULL;
1388 char *p;
1389 char path[__PAX_UTILS_PATH_MAX];
1390 int ret = 0;
1391
1392 if (strcmp(filename, "-") == 0)
1393 fp = stdin;
1394 else if ((fp = fopen(filename, "r")) == NULL)
1395 return 1;
1396
1397 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1398 if ((p = strchr(path, '\n')) != NULL)
1399 *p = 0;
1400 search_path = path;
1401 ret = scanelf_dir(path);
1402 }
1403 if (fp != stdin)
1404 fclose(fp);
1405 return ret;
1406}
1407
1408#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1409
1410static int load_ld_cache_config(int i, const char *fname)
1411{
1412 FILE *fp = NULL;
1413 char *p;
1414 char path[__PAX_UTILS_PATH_MAX];
1415
1416 if (i + 1 == ARRAY_SIZE(ldpaths))
1417 return i;
1418
1419 if ((fp = fopen(fname, "r")) == NULL)
1420 return i;
1421
1422 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1423 if ((p = strrchr(path, '\r')) != NULL)
1424 *p = 0;
1425 if ((p = strchr(path, '\n')) != NULL)
1426 *p = 0;
1427#ifdef __linux__
1428 // recursive includes of the same file will make this segfault.
1429 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1430 glob64_t gl;
1431 size_t x;
1432 char gpath[__PAX_UTILS_PATH_MAX];
1433
1434 memset(gpath, 0, sizeof(gpath));
1435
1436 if (path[8] != '/')
1437 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1438 else
1439 strncpy(gpath, &path[8], sizeof(gpath));
1440
1441 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1442 for (x = 0; x < gl.gl_pathc; ++x) {
1443 /* try to avoid direct loops */
1444 if (strcmp(gl.gl_pathv[x], fname) == 0)
1445 continue;
1446 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1447 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1448 globfree64(&gl);
1449 return i;
1450 }
1451 }
1452 globfree64 (&gl);
1453 continue;
1454 }
1455 }
1456#endif
1457 if (*path != '/')
1458 continue;
1459
1460 ldpaths[i++] = xstrdup(path);
1461
1462 if (i + 1 == ARRAY_SIZE(ldpaths))
1463 break;
1464 }
1465 ldpaths[i] = NULL;
1466
1467 fclose(fp);
1468 return i;
1469}
1470
1471#elif defined(__FreeBSD__) || (__DragonFly__)
1472
1473static int load_ld_cache_config(int i, const char *fname)
1474{
1475 FILE *fp = NULL;
1476 char *b = NULL, *p;
1477 struct elfhints_hdr hdr;
1478
1479 if (i + 1 == ARRAY_SIZE(ldpaths))
1480 return i;
1481
1482 if ((fp = fopen(fname, "r")) == NULL)
1483 return i;
1484
1485 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1486 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1487 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1488 {
1489 fclose(fp);
1490 return i;
1491 }
1492
1493 b = (char*)malloc(hdr.dirlistlen+1);
1494 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1495 fclose(fp);
1496 free(b);
1497 return i;
1498 }
1499
1500 while ((p = strsep(&b, ":"))) {
1501 if (*p == '\0') continue;
1502 ldpaths[i++] = xstrdup(p);
1503
1504 if (i + 1 == ARRAY_SIZE(ldpaths))
1505 break;
1506 }
1507 ldpaths[i] = NULL;
1508
1509 free(b);
1510 fclose(fp);
1511 return i;
1512}
1513
1514#else
1515
1516#warning Cache config support not implemented for your target
1517static int load_ld_cache_config(int i, const char *fname)
1518{
1519 memset(ldpaths, 0x00, sizeof(ldpaths));
1520}
1521
1522#endif
494 1523
495/* scan /etc/ld.so.conf for paths */ 1524/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1525static void scanelf_ldpath()
497{ 1526{
498 char scan_l, scan_ul, scan_ull; 1527 char scan_l, scan_ul, scan_ull;
499 char *path, *p; 1528 int i = 0;
500 FILE *fp;
501 1529
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1530 if (!ldpaths[0])
503 err("Unable to open ld.so.conf: %s", strerror(errno)); 1531 err("Unable to load any paths from ld.so.conf");
504 1532
505 scan_l = scan_ul = scan_ull = 0; 1533 scan_l = scan_ul = scan_ull = 0;
506 1534
507 path = (char*)xmalloc(_POSIX_PATH_MAX); 1535 while (ldpaths[i]) {
508 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
509 if (*path == '/') {
510 if ((p = strrchr(path, '\r')) != NULL)
511 *p = 0;
512 if ((p = strrchr(path, '\n')) != NULL)
513 *p = 0;
514 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1; 1536 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
515 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1537 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
516 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1538 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
517 scanelf_dir(path); 1539 scanelf_dir(ldpaths[i]);
1540 ++i;
518 } 1541 }
519 free(path);
520 fclose(fp);
521 1542
522 if (!scan_l) scanelf_dir("/lib"); 1543 if (!scan_l) scanelf_dir("/lib");
523 if (!scan_ul) scanelf_dir("/usr/lib"); 1544 if (!scan_ul) scanelf_dir("/usr/lib");
524 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1545 if (!scan_ull) scanelf_dir("/usr/local/lib");
525} 1546}
540 } 1561 }
541 1562
542 free(path); 1563 free(path);
543} 1564}
544 1565
545
546
547/* usage / invocation handling functions */ 1566/* usage / invocation handling functions */
548#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 1567#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
549#define a_argument required_argument 1568#define a_argument required_argument
550static struct option const long_opts[] = { 1569static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1570 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1571 {"ldpath", no_argument, NULL, 'l'},
553 {"recursive", no_argument, NULL, 'R'}, 1572 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1573 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1574 {"symlink", no_argument, NULL, 'y'},
1575 {"archives", no_argument, NULL, 'A'},
1576 {"ldcache", no_argument, NULL, 'L'},
1577 {"fix", no_argument, NULL, 'X'},
1578 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1579 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1580 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1581 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1582 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1583 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1584 {"interp", no_argument, NULL, 'i'},
1585 {"bind", no_argument, NULL, 'b'},
1586 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1587 {"symbol", a_argument, NULL, 's'},
1588 {"section", a_argument, NULL, 'k'},
1589 {"lib", a_argument, NULL, 'N'},
1590 {"gmatch", no_argument, NULL, 'g'},
1591 {"textrels", no_argument, NULL, 'T'},
1592 {"etype", a_argument, NULL, 'E'},
1593 {"bits", a_argument, NULL, 'M'},
563 {"all", no_argument, NULL, 'a'}, 1594 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1595 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1596 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1597 {"format", a_argument, NULL, 'F'},
1598 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1599 {"file", a_argument, NULL, 'o'},
568 {"nobanner", no_argument, NULL, 'B'}, 1600 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1601 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1602 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1603 {NULL, no_argument, NULL, 0x0}
572}; 1604};
1605
573static char *opts_help[] = { 1606static const char *opts_help[] = {
574 "Scan all directories in PATH environment", 1607 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1608 "Scan all directories in /etc/ld.so.conf",
576 "Scan directories recursively", 1609 "Scan directories recursively",
577 "Don't recursively cross mount points", 1610 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1611 "Don't scan symlinks",
1612 "Scan archives (.a files)",
1613 "Utilize ld.so.cache information (use with -r/-n)",
1614 "Try and 'fix' bad things (use with -r/-e)",
1615 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 1616 "Print PaX markings",
580 "Print GNU_STACK markings", 1617 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 1618 "Print TEXTREL information",
582 "Print RPATH information", 1619 "Print RPATH information",
583 "Print NEEDED information", 1620 "Print NEEDED information",
584 "Print INTERP information", 1621 "Print INTERP information",
1622 "Print BIND information",
1623 "Print SONAME information",
585 "Find a specified symbol", 1624 "Find a specified symbol",
1625 "Find a specified section",
1626 "Find a specified library",
1627 "Use strncmp to match libraries. (use with -N)",
1628 "Locate cause of TEXTREL",
1629 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1630 "Print only ELF files matching numeric bits",
586 "Print all scanned info (-x -e -t -r)\n", 1631 "Print all scanned info (-x -e -t -r -b)\n",
587 "Only output 'bad' things", 1632 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 1633 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 1634 "Use specified format for output",
1635 "Read input stream from a filename",
590 "Write output stream to a filename", 1636 "Write output stream to a filename",
591 "Don't display the header", 1637 "Don't display the header",
592 "Print this help and exit", 1638 "Print this help and exit",
593 "Print version and exit", 1639 "Print version and exit",
594 NULL 1640 NULL
596 1642
597/* display usage and exit */ 1643/* display usage and exit */
598static void usage(int status) 1644static void usage(int status)
599{ 1645{
600 unsigned long i; 1646 unsigned long i;
601 printf(" Scan ELF binaries for stuff\n\n" 1647 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1648 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 1649 printf("Options: -[%s]\n", PARSE_FLAGS);
604 for (i = 0; long_opts[i].name; ++i) 1650 for (i = 0; long_opts[i].name; ++i)
605 if (long_opts[i].has_arg == no_argument) 1651 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1652 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
607 long_opts[i].name, opts_help[i]); 1653 long_opts[i].name, opts_help[i]);
608 else 1654 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1655 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
610 long_opts[i].name, opts_help[i]); 1656 long_opts[i].name, opts_help[i]);
1657
1658 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 1659 exit(status);
612} 1660}
613 1661
614/* parse command line arguments and preform needed actions */ 1662/* parse command line arguments and preform needed actions */
1663#define do_pax_state(option, flag) \
1664 if (islower(option)) { \
1665 flags &= ~PF_##flag; \
1666 flags |= PF_NO##flag; \
1667 } else { \
1668 flags &= ~PF_NO##flag; \
1669 flags |= PF_##flag; \
1670 }
615static void parseargs(int argc, char *argv[]) 1671static int parseargs(int argc, char *argv[])
616{ 1672{
617 int flag; 1673 int i;
1674 const char *from_file = NULL;
1675 int ret = 0;
618 1676
619 opterr = 0; 1677 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1678 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 1679 switch (i) {
622 1680
623 case 'V': 1681 case 'V':
624 printf("%s compiled %s\n%s\n" 1682 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1683 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 1684 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 1685 exit(EXIT_SUCCESS);
628 break; 1686 break;
629 case 'h': usage(EXIT_SUCCESS); break; 1687 case 'h': usage(EXIT_SUCCESS); break;
630 1688 case 'f':
1689 if (from_file) warn("You prob don't want to specify -f twice");
1690 from_file = optarg;
1691 break;
1692 case 'E':
1693 strncpy(match_etypes, optarg, sizeof(match_etypes));
1694 break;
1695 case 'M':
1696 match_bits = atoi(optarg);
1697 break;
631 case 'o': { 1698 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 1699 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL)
635 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1700 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 1701 break;
638 } 1702 }
639 1703 case 'k':
1704 if (find_section) warn("You prob don't want to specify -k twice");
1705 find_section = optarg;
1706 break;
640 case 's': { 1707 case 's': {
641 size_t len; 1708 if (find_sym) warn("You prob don't want to specify -s twice");
642 find_sym = xstrdup(optarg); 1709 find_sym = optarg;
643 len = strlen(find_sym) + 1;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1710 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
645 sprintf(versioned_symname, "%s@", find_sym); 1711 sprintf(versioned_symname, "%s@", find_sym);
646 break; 1712 break;
647 } 1713 }
1714 case 'N': {
1715 if (find_lib) warn("You prob don't want to specify -N twice");
1716 find_lib = optarg;
1717 break;
1718 }
648 1719
649 case 'F': { 1720 case 'F': {
1721 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 1722 out_format = optarg;
651 break; 1723 break;
652 } 1724 }
1725 case 'z': {
1726 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1727 size_t x;
653 1728
1729 for (x = 0 ; x < strlen(optarg); x++) {
1730 switch(optarg[x]) {
1731 case 'p':
1732 case 'P':
1733 do_pax_state(optarg[x], PAGEEXEC);
1734 break;
1735 case 's':
1736 case 'S':
1737 do_pax_state(optarg[x], SEGMEXEC);
1738 break;
1739 case 'm':
1740 case 'M':
1741 do_pax_state(optarg[x], MPROTECT);
1742 break;
1743 case 'e':
1744 case 'E':
1745 do_pax_state(optarg[x], EMUTRAMP);
1746 break;
1747 case 'r':
1748 case 'R':
1749 do_pax_state(optarg[x], RANDMMAP);
1750 break;
1751 case 'x':
1752 case 'X':
1753 do_pax_state(optarg[x], RANDEXEC);
1754 break;
1755 default:
1756 break;
1757 }
1758 }
1759 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1760 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1761 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1762 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1763 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1764 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1765 setpax = flags;
1766 break;
1767 }
1768 case 'g': g_match = 1; break;
1769 case 'L': use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 1770 case 'y': scan_symlink = 0; break;
1771 case 'A': scan_archives = 1; break;
655 case 'B': show_banner = 0; break; 1772 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 1773 case 'l': scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 1774 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 1775 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 1776 case 'm': dir_crossmount = 0; break;
1777 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 1778 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 1779 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 1780 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 1781 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 1782 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 1783 case 'i': show_interp = 1; break;
1784 case 'b': show_bind = 1; break;
1785 case 'S': show_soname = 1; break;
1786 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 1787 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1788 case 'v': be_verbose = (be_verbose % 20) + 1; break;
668 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break; 1789 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
669 1790
670 case ':': 1791 case ':':
671 warn("Option missing parameter\n"); 1792 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 1793 case '?':
675 warn("Unknown option\n"); 1794 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 1795 default:
679 err("Unhandled option '%c'", flag); 1796 err("Unhandled option '%c'; please report this", i);
680 break;
681 }
682 } 1797 }
683 1798 }
684 if (be_quiet && be_verbose) 1799 if (show_textrels && be_verbose) {
685 err("You can be quiet or you can be verbose, not both, stupid"); 1800 if (which("objdump") != NULL)
686 1801 has_objdump = 1;
1802 }
687 /* let the format option override all other options */ 1803 /* let the format option override all other options */
688 if (out_format) { 1804 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1805 show_pax = show_phdr = show_textrel = show_rpath = \
1806 show_needed = show_interp = show_bind = show_soname = \
1807 show_textrels = 0;
690 for (flag=0; out_format[flag]; ++flag) { 1808 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 1809 if (!IS_MODIFIER(out_format[i])) continue;
692 1810
693 switch (out_format[++flag]) { 1811 switch (out_format[++i]) {
1812 case '+': break;
694 case '%': break; 1813 case '%': break;
1814 case '#': break;
695 case 'F': break; 1815 case 'F': break;
1816 case 'p': break;
1817 case 'f': break;
1818 case 'k': break;
696 case 's': break; 1819 case 's': break;
1820 case 'N': break;
697 case 'o': break; 1821 case 'o': break;
1822 case 'a': break;
1823 case 'M': break;
698 case 'x': show_pax = 1; break; 1824 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 1825 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 1826 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 1827 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 1828 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 1829 case 'i': show_interp = 1; break;
1830 case 'b': show_bind = 1; break;
1831 case 'S': show_soname = 1; break;
1832 case 'T': show_textrels = 1; break;
704 default: 1833 default:
705 err("Invalid format specifier '%c' (byte %i)", 1834 err("Invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 1835 out_format[i], i+1);
707 } 1836 }
708 } 1837 }
709 1838
710 /* construct our default format */ 1839 /* construct our default format */
711 } else { 1840 } else {
712 size_t fmt_len = 30; 1841 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1842 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1843 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1844 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1845 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1846 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1847 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1848 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1849 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1850 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1851 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1852 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1853 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1854 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1855 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1856 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 1857 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 1858 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 1859
726 /* now lets actually do the scanning */ 1860 /* now lets actually do the scanning */
1861 if (scan_ldpath || use_ldcache)
1862 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 1863 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 1864 if (scan_envpath) scanelf_envpath();
1865 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1866 from_file = "-";
1867 if (from_file) {
1868 scanelf_from_file(from_file);
1869 from_file = *argv;
1870 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 1871 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 1872 err("Nothing to scan !?");
731 while (optind < argc) 1873 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 1874 search_path = argv[optind++];
1875 ret = scanelf_dir(search_path);
1876 }
733 1877
734 /* clean up */ 1878 /* clean up */
735 if (find_sym) {
736 free(find_sym);
737 free(versioned_symname); 1879 free(versioned_symname);
1880 for (i = 0; ldpaths[i]; ++i)
1881 free(ldpaths[i]);
1882
1883 if (ldcache != 0)
1884 munmap(ldcache, ldcache_size);
1885 return ret;
1886}
1887
1888static char **get_split_env(const char *envvar)
1889{
1890 const char *delims = " \t\n";
1891 char **envvals = NULL;
1892 char *env, *s;
1893 int nentry;
1894
1895 if ((env = getenv(envvar)) == NULL)
1896 return NULL;
1897
1898 env = xstrdup(env);
1899 if (env == NULL)
1900 return NULL;
1901
1902 s = strtok(env, delims);
1903 if (s == NULL) {
1904 free(env);
1905 return NULL;
738 } 1906 }
739 if (out_format) free(out_format); 1907
1908 nentry = 0;
1909 while (s != NULL) {
1910 ++nentry;
1911 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1912 envvals[nentry-1] = s;
1913 s = strtok(NULL, delims);
1914 }
1915 envvals[nentry] = NULL;
1916
1917 /* don't want to free(env) as it contains the memory that backs
1918 * the envvals array of strings */
1919 return envvals;
1920}
1921static void parseenv()
1922{
1923 qa_textrels = get_split_env("QA_TEXTRELS");
1924 qa_execstack = get_split_env("QA_EXECSTACK");
1925 qa_wx_load = get_split_env("QA_WX_LOAD");
1926}
1927
1928#ifdef __PAX_UTILS_CLEANUP
1929static void cleanup()
1930{
1931 free(out_format);
1932 free(qa_textrels);
1933 free(qa_execstack);
1934 free(qa_wx_load);
1935}
1936#endif
1937
1938
1939int main(int argc, char *argv[])
1940{
1941 int ret;
1942 if (argc < 2)
1943 usage(EXIT_FAILURE);
1944 parseenv();
1945 ret = parseargs(argc, argv);
1946 fclose(stdout);
1947#ifdef __PAX_UTILS_CLEANUP
1948 cleanup();
1949 warn("The calls to add/delete heap should be off:\n"
1950 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1951 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1952#endif
1953 return ret;
740} 1954}
741 1955
742 1956
743 1957
744/* utility funcs */ 1958/* utility funcs */
745static char *xstrdup(char *s) 1959static char *xstrdup(const char *s)
746{ 1960{
747 char *ret = strdup(s); 1961 char *ret = strdup(s);
748 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1962 if (!ret) err("Could not strdup(): %s", strerror(errno));
749 return ret; 1963 return ret;
750} 1964}
752{ 1966{
753 void *ret = malloc(size); 1967 void *ret = malloc(size);
754 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1968 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
755 return ret; 1969 return ret;
756} 1970}
1971static void *xrealloc(void *ptr, size_t size)
1972{
1973 void *ret = realloc(ptr, size);
1974 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1975 return ret;
1976}
757static void xstrcat(char **dst, const char *src, size_t *curr_len) 1977static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
758{ 1978{
759 long new_len; 1979 size_t new_len;
760 1980
761 new_len = strlen(*dst) + strlen(src); 1981 new_len = strlen(*dst) + strlen(src);
762 if (*curr_len <= new_len) { 1982 if (*curr_len <= new_len) {
763 *curr_len = new_len + (*curr_len / 2); 1983 *curr_len = new_len + (*curr_len / 2);
764 *dst = realloc(*dst, *curr_len); 1984 *dst = realloc(*dst, *curr_len);
765 if (!*dst) 1985 if (!*dst)
766 err("could not realloc %li bytes", (unsigned long)*curr_len); 1986 err("could not realloc() %li bytes", (unsigned long)*curr_len);
767 } 1987 }
768 1988
1989 if (n)
1990 strncat(*dst, src, n);
1991 else
769 strcat(*dst, src); 1992 strcat(*dst, src);
770} 1993}
771static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1994static inline void xchrcat(char **dst, const char append, size_t *curr_len)
772{ 1995{
773 static char my_app[2]; 1996 static char my_app[2];
774 my_app[0] = append; 1997 my_app[0] = append;
775 my_app[1] = '\0'; 1998 my_app[1] = '\0';
776 xstrcat(dst, my_app, curr_len); 1999 xstrcat(dst, my_app, curr_len);
777} 2000}
778static int xemptybuffer(const char *buff) 2001
2002/* Match filename against entries in matchlist, return TRUE
2003 * if the file is listed */
2004static int file_matches_list(const char *filename, char **matchlist)
779{ 2005{
780 long i; 2006 char **file;
781 for (i=0; buff[i]; ++i) 2007 char *match;
782 if (buff[i] != ' ') 2008 char buf[__PAX_UTILS_PATH_MAX];
2009
2010 if (matchlist == NULL)
783 return 0; 2011 return 0;
2012
2013 for (file = matchlist; *file != NULL; file++) {
2014 if (search_path) {
2015 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2016 match = buf;
2017 } else {
2018 match = *file;
2019 }
2020 if (fnmatch(match, filename, 0) == 0)
784 return 1; 2021 return 1;
2022 }
2023 return 0;
785} 2024}
786
787
788
789int main(int argc, char *argv[])
790{
791 if (argc < 2)
792 usage(EXIT_FAILURE);
793 parseargs(argc, argv);
794 fclose(stdout);
795 return EXIT_SUCCESS;
796}

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