/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.44 Revision 1.177
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 1.177 2007/05/20 23:20:46 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 1.177 2007/05/20 23:20:46 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}
957
958static char *scanelf_file_sym(elfobj *elf, char *found_sym)
959{
960 unsigned long i;
961 char *ret;
293 void *symtab_void, *strtab_void; 962 void *symtab_void, *strtab_void;
294 963
295 if (!find_sym) return NULL; 964 if (!find_sym) return NULL;
965 ret = find_sym;
296 966
297 symtab_void = elf_findsecbyname(elf, ".symtab"); 967 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
298 strtab_void = elf_findsecbyname(elf, ".strtab");
299 968
300 if (symtab_void && strtab_void) { 969 if (symtab_void && strtab_void) {
301#define FIND_SYM(B) \ 970#define FIND_SYM(B) \
302 if (elf->elf_class == ELFCLASS ## B) { \ 971 if (elf->elf_class == ELFCLASS ## B) { \
303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 972 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 973 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 974 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 975 unsigned long cnt = EGET(symtab->sh_entsize); \
307 char *symname; \ 976 char *symname; \
977 if (cnt) \
978 cnt = EGET(symtab->sh_size) / cnt; \
308 for (i = 0; i < cnt; ++i) { \ 979 for (i = 0; i < cnt; ++i) { \
309 if (sym->st_name) { \ 980 if (sym->st_name) { \
981 /* make sure the symbol name is in acceptable memory range */ \
310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 982 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
311 if (*find_sym == '*') { \ 983 if ((void*)symname > (void*)elf->data_end) { \
984 warnf("%s: corrupt ELF symbols", elf->filename); \
985 ++sym; \
986 continue; \
987 } \
988 /* debug display ... show all symbols and some extra info */ \
989 if (g_match ? rematch(ret, symname, REG_EXTENDED) == 0 : *ret == '*') { \
312 printf("%s(%s) %5lX %15s %s\n", \ 990 printf("%s(%s) %5lX %15s %s %s\n", \
313 ((*found_sym == 0) ? "\n\t" : "\t"), \ 991 ((*found_sym == 0) ? "\n\t" : "\t"), \
314 (char *)basename(filename), \ 992 elf->base_filename, \
315 (long)sym->st_size, \ 993 (unsigned long)sym->st_size, \
316 (char *)get_elfstttype(sym->st_info), \ 994 get_elfstttype(sym->st_info), \
317 symname); \ 995 sym->st_shndx == SHN_UNDEF ? "U" : "D", symname); \
318 *found_sym = 1; \ 996 *found_sym = 1; \
319 } else if ((strcmp(find_sym, symname) == 0) || \ 997 } else { \
320 (strcmp(symname, versioned_symname) == 0)) \ 998 /* allow the user to specify a comma delimited list of symbols to search for */ \
999 char *this_sym, *this_sym_ver, *next_sym; \
1000 this_sym = ret; \
1001 this_sym_ver = versioned_symname; \
1002 do { \
1003 next_sym = strchr(this_sym, ','); \
1004 if (next_sym == NULL) \
1005 next_sym = this_sym + strlen(this_sym); \
1006 /* do we want a defined symbol ? */ \
1007 if (*this_sym == '+') { \
1008 if (sym->st_shndx == SHN_UNDEF) \
1009 goto skip_this_sym##B; \
1010 ++this_sym; \
1011 ++this_sym_ver; \
1012 /* do we want an undefined symbol ? */ \
1013 } else if (*this_sym == '-') { \
1014 if (sym->st_shndx != SHN_UNDEF) \
1015 goto skip_this_sym##B; \
1016 ++this_sym; \
1017 ++this_sym_ver; \
1018 } \
1019 /* ok, lets compare the name now */ \
1020 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
1021 (strncmp(this_sym_ver, symname, strlen(this_sym_ver)) == 0)) { \
1022 if (be_semi_verbose) { \
1023 char buf[126]; \
1024 snprintf(buf, sizeof(buf), "%lX %s %s", \
1025 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
1026 ret = buf; \
1027 } else \
1028 ret = this_sym; \
321 (*found_sym)++; \ 1029 (*found_sym)++; \
1030 goto break_out; \
1031 } \
1032 skip_this_sym##B: this_sym = next_sym + 1; \
1033 } while (*next_sym != '\0'); \
1034 } \
322 } \ 1035 } \
323 ++sym; \ 1036 ++sym; \
324 } } 1037 } }
325 FIND_SYM(32) 1038 FIND_SYM(32)
326 FIND_SYM(64) 1039 FIND_SYM(64)
327 } 1040 }
1041
1042break_out:
1043 if (be_wewy_wewy_quiet) return NULL;
1044
328 if (*find_sym != '*' && *found_sym) 1045 if (*find_sym != '*' && *found_sym)
329 return find_sym; 1046 return ret;
330 if (be_quiet) 1047 if (be_quiet)
331 return NULL; 1048 return NULL;
332 else 1049 else
333 return " - "; 1050 return (char *)" - ";
334} 1051}
1052
1053
1054static char *scanelf_file_sections(elfobj *elf, char *found_section)
1055{
1056 if (!find_section)
1057 return NULL;
1058
1059#define FIND_SECTION(B) \
1060 if (elf->elf_class == ELFCLASS ## B) { \
1061 int invert; \
1062 Elf ## B ## _Shdr *section; \
1063 invert = (*find_section == '!' ? 1 : 0); \
1064 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
1065 if ((section == NULL && invert) || (section != NULL && !invert)) \
1066 *found_section = 1; \
1067 }
1068 FIND_SECTION(32)
1069 FIND_SECTION(64)
1070
1071 if (be_wewy_wewy_quiet)
1072 return NULL;
1073
1074 if (*found_section)
1075 return find_section;
1076
1077 if (be_quiet)
1078 return NULL;
1079 else
1080 return (char *)" - ";
1081}
1082
335/* scan an elf file and show all the fun stuff */ 1083/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout) 1084#define prints(str) write(fileno(stdout), str, strlen(str))
337static void scanelf_file(const char *filename) 1085static int scanelf_elfobj(elfobj *elf)
338{ 1086{
339 unsigned long i; 1087 unsigned long i;
340 char found_pax, found_stack, found_relro, found_textrel, 1088 char found_pax, found_phdr, found_relro, found_load, found_textrel,
341 found_rpath, found_needed, found_interp, found_sym, 1089 found_rpath, found_needed, found_interp, found_bind, found_soname,
342 found_file; 1090 found_sym, found_lib, found_file, found_textrels, found_section;
343 elfobj *elf;
344 struct stat st;
345 static char *out_buffer = NULL; 1091 static char *out_buffer = NULL;
346 static size_t out_len; 1092 static size_t out_len;
347 1093
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 = \ 1094 found_pax = found_phdr = found_relro = found_load = found_textrel = \
360 found_rpath = found_needed = found_interp = found_sym = \ 1095 found_rpath = found_needed = found_interp = found_bind = found_soname = \
361 found_file = 0; 1096 found_sym = found_lib = found_file = found_textrels = found_section = 0;
362 1097
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) 1098 if (be_verbose > 2)
370 printf("%s: scanning file {%s,%s}\n", filename, 1099 printf("%s: scanning file {%s,%s}\n", elf->filename,
371 get_elfeitype(elf, EI_CLASS, elf->elf_class), 1100 get_elfeitype(EI_CLASS, elf->elf_class),
372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 1101 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
373 else if (be_verbose) 1102 else if (be_verbose > 1)
374 printf("%s: scanning file\n", filename); 1103 printf("%s: scanning file\n", elf->filename);
375 1104
376 /* init output buffer */ 1105 /* init output buffer */
377 if (!out_buffer) { 1106 if (!out_buffer) {
378 out_len = sizeof(char) * 80; 1107 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len); 1108 out_buffer = (char*)xmalloc(out_len);
380 } 1109 }
381 *out_buffer = '\0'; 1110 *out_buffer = '\0';
382 1111
383 /* show the header */ 1112 /* show the header */
384 if (!be_quiet && show_banner) { 1113 if (!be_quiet && show_banner) {
385 for (i=0; out_format[i]; ++i) { 1114 for (i = 0; out_format[i]; ++i) {
386 if (out_format[i] != '%') continue; 1115 if (!IS_MODIFIER(out_format[i])) continue;
387 1116
388 switch (out_format[++i]) { 1117 switch (out_format[++i]) {
1118 case '+': break;
389 case '%': break; 1119 case '%': break;
1120 case '#': break;
1121 case 'F':
1122 case 'p':
390 case 'F': prints("FILE "); break; 1123 case 'f': prints("FILE "); found_file = 1; break;
391 case 'o': prints(" TYPE "); break; 1124 case 'o': prints(" TYPE "); break;
392 case 'x': prints(" PAX "); break; 1125 case 'x': prints(" PAX "); break;
393 case 'e': prints("STK/REL "); break; 1126 case 'e': prints("STK/REL/PTL "); break;
394 case 't': prints("TEXTREL "); break; 1127 case 't': prints("TEXTREL "); break;
395 case 'r': prints("RPATH "); break; 1128 case 'r': prints("RPATH "); break;
1129 case 'M': prints("CLASS "); break;
396 case 'n': prints("NEEDED "); break; 1130 case 'n': prints("NEEDED "); break;
397 case 'i': prints("INTERP "); break; 1131 case 'i': prints("INTERP "); break;
1132 case 'b': prints("BIND "); break;
1133 case 'S': prints("SONAME "); break;
398 case 's': prints("SYM "); break; 1134 case 's': prints("SYM "); break;
1135 case 'N': prints("LIB "); break;
1136 case 'T': prints("TEXTRELS "); break;
1137 case 'k': prints("SECTION "); break;
1138 case 'a': prints("ARCH "); break;
1139 default: warnf("'%c' has no title ?", out_format[i]);
399 } 1140 }
400 } 1141 }
1142 if (!found_file) prints("FILE ");
401 prints("\n"); 1143 prints("\n");
1144 found_file = 0;
402 show_banner = 0; 1145 show_banner = 0;
403 } 1146 }
404 1147
405 /* dump all the good stuff */ 1148 /* dump all the good stuff */
406 for (i=0; out_format[i]; ++i) { 1149 for (i = 0; out_format[i]; ++i) {
407 const char *out; 1150 const char *out;
1151 const char *tmp;
408 1152
409 /* make sure we trim leading spaces in quiet mode */ 1153 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); 1154 xchrcat(&out_buffer, out_format[i], &out_len);
415 continue; 1155 continue;
416 } 1156 }
417 1157
418 out = NULL; 1158 out = NULL;
1159 be_wewy_wewy_quiet = (out_format[i] == '#');
1160 be_semi_verbose = (out_format[i] == '+');
419 switch (out_format[++i]) { 1161 switch (out_format[++i]) {
1162 case '+':
1163 case '%':
1164 case '#':
420 case '%': xchrcat(&out_buffer, '%', &out_len); break; 1165 xchrcat(&out_buffer, out_format[i], &out_len); break;
421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; 1166 case 'F':
1167 found_file = 1;
1168 if (be_wewy_wewy_quiet) break;
1169 xstrcat(&out_buffer, elf->filename, &out_len);
1170 break;
1171 case 'p':
1172 found_file = 1;
1173 if (be_wewy_wewy_quiet) break;
1174 tmp = elf->filename;
1175 if (search_path) {
1176 ssize_t len_search = strlen(search_path);
1177 ssize_t len_file = strlen(elf->filename);
1178 if (!strncmp(elf->filename, search_path, len_search) && \
1179 len_file > len_search)
1180 tmp += len_search;
1181 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1182 }
1183 xstrcat(&out_buffer, tmp, &out_len);
1184 break;
1185 case 'f':
1186 found_file = 1;
1187 if (be_wewy_wewy_quiet) break;
1188 tmp = strrchr(elf->filename, '/');
1189 tmp = (tmp == NULL ? elf->filename : tmp+1);
1190 xstrcat(&out_buffer, tmp, &out_len);
1191 break;
422 case 'o': out = get_elfetype(elf); break; 1192 case 'o': out = get_elfetype(elf); break;
423 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 1193 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; 1194 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; 1195 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1196 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; 1197 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1198 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1199 case 'n':
427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; 1200 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; 1201 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1202 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1203 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; 1204 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1205 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1206 case 'a': out = get_elfemtype(elf); break;
1207 default: warnf("'%c' has no scan code?", out_format[i]);
430 } 1208 }
1209 if (out) {
1210 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1211 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1212 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1213 else
431 if (out) xstrcat(&out_buffer, out, &out_len); 1214 xstrcat(&out_buffer, out, &out_len);
432 } 1215 }
1216 }
433 1217
434 if (!found_file) { 1218#define FOUND_SOMETHING() \
435 if (!be_quiet || found_pax || found_stack || found_textrel || \ 1219 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
436 found_rpath || found_needed || found_interp || found_sym) 1220 found_rpath || found_needed || found_interp || found_bind || \
1221 found_soname || found_sym || found_lib || found_textrels || found_section )
1222
1223 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1224 xchrcat(&out_buffer, ' ', &out_len);
437 xstrcat(&out_buffer, filename, &out_len); 1225 xstrcat(&out_buffer, elf->filename, &out_len);
438 } 1226 }
439 if (!(be_quiet && xemptybuffer(out_buffer))) 1227 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
440 puts(out_buffer); 1228 puts(out_buffer);
1229 fflush(stdout);
1230 }
441 1231
1232 return 0;
1233}
1234
1235/* scan a single elf */
1236static int scanelf_elf(const char *filename, int fd, size_t len)
1237{
1238 int ret = 1;
1239 elfobj *elf;
1240
1241 /* verify this is real ELF */
1242 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1243 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1244 return ret;
1245 }
1246 switch (match_bits) {
1247 case 32:
1248 if (elf->elf_class != ELFCLASS32)
1249 goto label_done;
1250 break;
1251 case 64:
1252 if (elf->elf_class != ELFCLASS64)
1253 goto label_done;
1254 break;
1255 default: break;
1256 }
1257 if (strlen(match_etypes)) {
1258 char sbuf[126];
1259 strncpy(sbuf, match_etypes, sizeof(sbuf));
1260 if (strchr(match_etypes, ',') != NULL) {
1261 char *p;
1262 while((p = strrchr(sbuf, ',')) != NULL) {
1263 *p = 0;
1264 if (etype_lookup(p+1) == get_etype(elf))
1265 goto label_ret;
1266 }
1267 }
1268 if (etype_lookup(sbuf) != get_etype(elf))
1269 goto label_done;
1270 }
1271
1272label_ret:
1273 ret = scanelf_elfobj(elf);
1274
1275label_done:
442 unreadelf(elf); 1276 unreadelf(elf);
1277 return ret;
1278}
1279
1280/* scan an archive of elfs */
1281static int scanelf_archive(const char *filename, int fd, size_t len)
1282{
1283 archive_handle *ar;
1284 archive_member *m;
1285 char *ar_buffer;
1286 elfobj *elf;
1287
1288 ar = ar_open_fd(filename, fd);
1289 if (ar == NULL)
1290 return 1;
1291
1292 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1293 while ((m=ar_next(ar)) != NULL) {
1294 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1295 if (elf) {
1296 scanelf_elfobj(elf);
1297 unreadelf(elf);
1298 }
1299 }
1300 munmap(ar_buffer, len);
1301
1302 return 0;
1303}
1304/* scan a file which may be an elf or an archive or some other magical beast */
1305static int scanelf_file(const char *filename, const struct stat *st_cache)
1306{
1307 const struct stat *st = st_cache;
1308 struct stat symlink_st;
1309 int fd;
1310
1311 /* always handle regular files and handle symlinked files if no -y */
1312 if (S_ISLNK(st->st_mode)) {
1313 if (!scan_symlink) return 1;
1314 stat(filename, &symlink_st);
1315 st = &symlink_st;
1316 }
1317
1318 if (!S_ISREG(st->st_mode)) {
1319 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1320 return 1;
1321 }
1322
1323 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1324 return 1;
1325
1326 if (scanelf_elf(filename, fd, st->st_size) == 1 && scan_archives)
1327 /* if it isn't an ELF, maybe it's an .a archive */
1328 scanelf_archive(filename, fd, st->st_size);
1329
1330 close(fd);
1331 return 0;
443} 1332}
444 1333
445/* scan a directory for ET_EXEC files and print when we find one */ 1334/* scan a directory for ET_EXEC files and print when we find one */
446static void scanelf_dir(const char *path) 1335static int scanelf_dir(const char *path)
447{ 1336{
448 register DIR *dir; 1337 register DIR *dir;
449 register struct dirent *dentry; 1338 register struct dirent *dentry;
450 struct stat st_top, st; 1339 struct stat st_top, st;
451 char buf[_POSIX_PATH_MAX]; 1340 char buf[__PAX_UTILS_PATH_MAX];
452 size_t pathlen = 0, len = 0; 1341 size_t pathlen = 0, len = 0;
1342 int ret = 0;
453 1343
454 /* make sure path exists */ 1344 /* make sure path exists */
455 if (lstat(path, &st_top) == -1) { 1345 if (lstat(path, &st_top) == -1) {
456 if (be_verbose > 2) printf("%s: does not exist\n", path); 1346 if (be_verbose > 2) printf("%s: does not exist\n", path);
457 return; 1347 return 1;
458 } 1348 }
459 1349
460 /* ok, if it isn't a directory, assume we can open it */ 1350 /* ok, if it isn't a directory, assume we can open it */
461 if (!S_ISDIR(st_top.st_mode)) { 1351 if (!S_ISDIR(st_top.st_mode)) {
462 scanelf_file(path); 1352 return scanelf_file(path, &st_top);
463 return;
464 } 1353 }
465 1354
466 /* now scan the dir looking for fun stuff */ 1355 /* now scan the dir looking for fun stuff */
467 if ((dir = opendir(path)) == NULL) { 1356 if ((dir = opendir(path)) == NULL) {
468 warnf("could not opendir %s: %s", path, strerror(errno)); 1357 warnf("could not opendir %s: %s", path, strerror(errno));
469 return; 1358 return 1;
470 } 1359 }
471 if (be_verbose) printf("%s: scanning dir\n", path); 1360 if (be_verbose > 1) printf("%s: scanning dir\n", path);
472 1361
473 pathlen = strlen(path); 1362 pathlen = strlen(path);
474 while ((dentry = readdir(dir))) { 1363 while ((dentry = readdir(dir))) {
475 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 1364 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
476 continue; 1365 continue;
477 len = (pathlen + 1 + strlen(dentry->d_name) + 1); 1366 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
478 if (len >= sizeof(buf)) { 1367 if (len >= sizeof(buf)) {
479 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); 1368 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1369 (unsigned long)len, (unsigned long)sizeof(buf));
480 continue; 1370 continue;
481 } 1371 }
482 sprintf(buf, "%s/%s", path, dentry->d_name); 1372 snprintf(buf, sizeof(buf), "%s%s%s", path, (path[pathlen-1] == '/') ? "" : "/", dentry->d_name);
483 if (lstat(buf, &st) != -1) { 1373 if (lstat(buf, &st) != -1) {
484 if (S_ISREG(st.st_mode)) 1374 if (S_ISREG(st.st_mode))
485 scanelf_file(buf); 1375 ret = scanelf_file(buf, &st);
486 else if (dir_recurse && S_ISDIR(st.st_mode)) { 1376 else if (dir_recurse && S_ISDIR(st.st_mode)) {
487 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 1377 if (dir_crossmount || (st_top.st_dev == st.st_dev))
488 scanelf_dir(buf); 1378 ret = scanelf_dir(buf);
489 } 1379 }
490 } 1380 }
491 } 1381 }
492 closedir(dir); 1382 closedir(dir);
1383 return ret;
493} 1384}
1385
1386static int scanelf_from_file(const char *filename)
1387{
1388 FILE *fp = NULL;
1389 char *p;
1390 char path[__PAX_UTILS_PATH_MAX];
1391 int ret = 0;
1392
1393 if (strcmp(filename, "-") == 0)
1394 fp = stdin;
1395 else if ((fp = fopen(filename, "r")) == NULL)
1396 return 1;
1397
1398 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1399 if ((p = strchr(path, '\n')) != NULL)
1400 *p = 0;
1401 search_path = path;
1402 ret = scanelf_dir(path);
1403 }
1404 if (fp != stdin)
1405 fclose(fp);
1406 return ret;
1407}
1408
1409#if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1410
1411static int load_ld_cache_config(int i, const char *fname)
1412{
1413 FILE *fp = NULL;
1414 char *p;
1415 char path[__PAX_UTILS_PATH_MAX];
1416
1417 if (i + 1 == ARRAY_SIZE(ldpaths))
1418 return i;
1419
1420 if ((fp = fopen(fname, "r")) == NULL)
1421 return i;
1422
1423 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1424 if ((p = strrchr(path, '\r')) != NULL)
1425 *p = 0;
1426 if ((p = strchr(path, '\n')) != NULL)
1427 *p = 0;
1428#ifdef __linux__
1429 // recursive includes of the same file will make this segfault.
1430 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1431 glob64_t gl;
1432 size_t x;
1433 char gpath[__PAX_UTILS_PATH_MAX];
1434
1435 memset(gpath, 0, sizeof(gpath));
1436
1437 if (path[8] != '/')
1438 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1439 else
1440 strncpy(gpath, &path[8], sizeof(gpath));
1441
1442 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1443 for (x = 0; x < gl.gl_pathc; ++x) {
1444 /* try to avoid direct loops */
1445 if (strcmp(gl.gl_pathv[x], fname) == 0)
1446 continue;
1447 i = load_ld_cache_config(i, gl.gl_pathv[x]);
1448 if (i + 1 >= ARRAY_SIZE(ldpaths)) {
1449 globfree64(&gl);
1450 return i;
1451 }
1452 }
1453 globfree64 (&gl);
1454 continue;
1455 }
1456 }
1457#endif
1458 if (*path != '/')
1459 continue;
1460
1461 ldpaths[i++] = xstrdup(path);
1462
1463 if (i + 1 == ARRAY_SIZE(ldpaths))
1464 break;
1465 }
1466 ldpaths[i] = NULL;
1467
1468 fclose(fp);
1469 return i;
1470}
1471
1472#elif defined(__FreeBSD__) || (__DragonFly__)
1473
1474static int load_ld_cache_config(int i, const char *fname)
1475{
1476 FILE *fp = NULL;
1477 char *b = NULL, *p;
1478 struct elfhints_hdr hdr;
1479
1480 if (i + 1 == ARRAY_SIZE(ldpaths))
1481 return i;
1482
1483 if ((fp = fopen(fname, "r")) == NULL)
1484 return i;
1485
1486 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1487 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1488 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1489 {
1490 fclose(fp);
1491 return i;
1492 }
1493
1494 b = (char*)malloc(hdr.dirlistlen+1);
1495 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1496 fclose(fp);
1497 free(b);
1498 return i;
1499 }
1500
1501 while ((p = strsep(&b, ":"))) {
1502 if (*p == '\0') continue;
1503 ldpaths[i++] = xstrdup(p);
1504
1505 if (i + 1 == ARRAY_SIZE(ldpaths))
1506 break;
1507 }
1508 ldpaths[i] = NULL;
1509
1510 free(b);
1511 fclose(fp);
1512 return i;
1513}
1514
1515#else
1516
1517#warning Cache config support not implemented for your target
1518static int load_ld_cache_config(int i, const char *fname)
1519{
1520 memset(ldpaths, 0x00, sizeof(ldpaths));
1521}
1522
1523#endif
494 1524
495/* scan /etc/ld.so.conf for paths */ 1525/* scan /etc/ld.so.conf for paths */
496static void scanelf_ldpath() 1526static void scanelf_ldpath()
497{ 1527{
498 char scan_l, scan_ul, scan_ull; 1528 char scan_l, scan_ul, scan_ull;
499 char *path, *p; 1529 int i = 0;
500 FILE *fp;
501 1530
502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 1531 if (!ldpaths[0])
503 err("Unable to open ld.so.conf: %s", strerror(errno)); 1532 err("Unable to load any paths from ld.so.conf");
504 1533
505 scan_l = scan_ul = scan_ull = 0; 1534 scan_l = scan_ul = scan_ull = 0;
506 1535
507 path = (char*)xmalloc(_POSIX_PATH_MAX); 1536 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; 1537 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
515 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 1538 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
516 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 1539 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
517 scanelf_dir(path); 1540 scanelf_dir(ldpaths[i]);
1541 ++i;
518 } 1542 }
519 free(path);
520 fclose(fp);
521 1543
522 if (!scan_l) scanelf_dir("/lib"); 1544 if (!scan_l) scanelf_dir("/lib");
523 if (!scan_ul) scanelf_dir("/usr/lib"); 1545 if (!scan_ul) scanelf_dir("/usr/lib");
524 if (!scan_ull) scanelf_dir("/usr/local/lib"); 1546 if (!scan_ull) scanelf_dir("/usr/local/lib");
525} 1547}
540 } 1562 }
541 1563
542 free(path); 1564 free(path);
543} 1565}
544 1566
545
546
547/* usage / invocation handling functions */ 1567/* usage / invocation handling functions */
548#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV" 1568#define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
549#define a_argument required_argument 1569#define a_argument required_argument
550static struct option const long_opts[] = { 1570static struct option const long_opts[] = {
551 {"path", no_argument, NULL, 'p'}, 1571 {"path", no_argument, NULL, 'p'},
552 {"ldpath", no_argument, NULL, 'l'}, 1572 {"ldpath", no_argument, NULL, 'l'},
553 {"recursive", no_argument, NULL, 'R'}, 1573 {"recursive", no_argument, NULL, 'R'},
554 {"mount", no_argument, NULL, 'm'}, 1574 {"mount", no_argument, NULL, 'm'},
555 {"symlink", no_argument, NULL, 'y'}, 1575 {"symlink", no_argument, NULL, 'y'},
1576 {"archives", no_argument, NULL, 'A'},
1577 {"ldcache", no_argument, NULL, 'L'},
1578 {"fix", no_argument, NULL, 'X'},
1579 {"setpax", a_argument, NULL, 'z'},
556 {"pax", no_argument, NULL, 'x'}, 1580 {"pax", no_argument, NULL, 'x'},
557 {"header", no_argument, NULL, 'e'}, 1581 {"header", no_argument, NULL, 'e'},
558 {"textrel", no_argument, NULL, 't'}, 1582 {"textrel", no_argument, NULL, 't'},
559 {"rpath", no_argument, NULL, 'r'}, 1583 {"rpath", no_argument, NULL, 'r'},
560 {"needed", no_argument, NULL, 'n'}, 1584 {"needed", no_argument, NULL, 'n'},
561 {"interp", no_argument, NULL, 'i'}, 1585 {"interp", no_argument, NULL, 'i'},
1586 {"bind", no_argument, NULL, 'b'},
1587 {"soname", no_argument, NULL, 'S'},
562 {"symbol", a_argument, NULL, 's'}, 1588 {"symbol", a_argument, NULL, 's'},
1589 {"section", a_argument, NULL, 'k'},
1590 {"lib", a_argument, NULL, 'N'},
1591 {"gmatch", no_argument, NULL, 'g'},
1592 {"textrels", no_argument, NULL, 'T'},
1593 {"etype", a_argument, NULL, 'E'},
1594 {"bits", a_argument, NULL, 'M'},
563 {"all", no_argument, NULL, 'a'}, 1595 {"all", no_argument, NULL, 'a'},
564 {"quiet", no_argument, NULL, 'q'}, 1596 {"quiet", no_argument, NULL, 'q'},
565 {"verbose", no_argument, NULL, 'v'}, 1597 {"verbose", no_argument, NULL, 'v'},
566 {"format", a_argument, NULL, 'F'}, 1598 {"format", a_argument, NULL, 'F'},
1599 {"from", a_argument, NULL, 'f'},
567 {"file", a_argument, NULL, 'o'}, 1600 {"file", a_argument, NULL, 'o'},
568 {"nobanner", no_argument, NULL, 'B'}, 1601 {"nobanner", no_argument, NULL, 'B'},
569 {"help", no_argument, NULL, 'h'}, 1602 {"help", no_argument, NULL, 'h'},
570 {"version", no_argument, NULL, 'V'}, 1603 {"version", no_argument, NULL, 'V'},
571 {NULL, no_argument, NULL, 0x0} 1604 {NULL, no_argument, NULL, 0x0}
572}; 1605};
1606
573static char *opts_help[] = { 1607static const char *opts_help[] = {
574 "Scan all directories in PATH environment", 1608 "Scan all directories in PATH environment",
575 "Scan all directories in /etc/ld.so.conf", 1609 "Scan all directories in /etc/ld.so.conf",
576 "Scan directories recursively", 1610 "Scan directories recursively",
577 "Don't recursively cross mount points", 1611 "Don't recursively cross mount points",
578 "Don't scan symlinks\n", 1612 "Don't scan symlinks",
1613 "Scan archives (.a files)",
1614 "Utilize ld.so.cache information (use with -r/-n)",
1615 "Try and 'fix' bad things (use with -r/-e)",
1616 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
579 "Print PaX markings", 1617 "Print PaX markings",
580 "Print GNU_STACK markings", 1618 "Print GNU_STACK/PT_LOAD markings",
581 "Print TEXTREL information", 1619 "Print TEXTREL information",
582 "Print RPATH information", 1620 "Print RPATH information",
583 "Print NEEDED information", 1621 "Print NEEDED information",
584 "Print INTERP information", 1622 "Print INTERP information",
1623 "Print BIND information",
1624 "Print SONAME information",
585 "Find a specified symbol", 1625 "Find a specified symbol",
1626 "Find a specified section",
1627 "Find a specified library",
1628 "Use strncmp to match libraries. (use with -N)",
1629 "Locate cause of TEXTREL",
1630 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1631 "Print only ELF files matching numeric bits",
586 "Print all scanned info (-x -e -t -r)\n", 1632 "Print all scanned info (-x -e -t -r -b)\n",
587 "Only output 'bad' things", 1633 "Only output 'bad' things",
588 "Be verbose (can be specified more than once)", 1634 "Be verbose (can be specified more than once)",
589 "Use specified format for output", 1635 "Use specified format for output",
1636 "Read input stream from a filename",
590 "Write output stream to a filename", 1637 "Write output stream to a filename",
591 "Don't display the header", 1638 "Don't display the header",
592 "Print this help and exit", 1639 "Print this help and exit",
593 "Print version and exit", 1640 "Print version and exit",
594 NULL 1641 NULL
596 1643
597/* display usage and exit */ 1644/* display usage and exit */
598static void usage(int status) 1645static void usage(int status)
599{ 1646{
600 unsigned long i; 1647 unsigned long i;
601 printf(" Scan ELF binaries for stuff\n\n" 1648 printf("* Scan ELF binaries for stuff\n\n"
602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 1649 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
603 printf("Options: -[%s]\n", PARSE_FLAGS); 1650 printf("Options: -[%s]\n", PARSE_FLAGS);
604 for (i = 0; long_opts[i].name; ++i) 1651 for (i = 0; long_opts[i].name; ++i)
605 if (long_opts[i].has_arg == no_argument) 1652 if (long_opts[i].has_arg == no_argument)
606 printf(" -%c, --%-13s %s\n", long_opts[i].val, 1653 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
607 long_opts[i].name, opts_help[i]); 1654 long_opts[i].name, opts_help[i]);
608 else 1655 else
609 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 1656 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
610 long_opts[i].name, opts_help[i]); 1657 long_opts[i].name, opts_help[i]);
1658
1659 puts("\nFor more information, see the scanelf(1) manpage");
611 exit(status); 1660 exit(status);
612} 1661}
613 1662
614/* parse command line arguments and preform needed actions */ 1663/* parse command line arguments and preform needed actions */
1664#define do_pax_state(option, flag) \
1665 if (islower(option)) { \
1666 flags &= ~PF_##flag; \
1667 flags |= PF_NO##flag; \
1668 } else { \
1669 flags &= ~PF_NO##flag; \
1670 flags |= PF_##flag; \
1671 }
615static void parseargs(int argc, char *argv[]) 1672static int parseargs(int argc, char *argv[])
616{ 1673{
617 int flag; 1674 int i;
1675 const char *from_file = NULL;
1676 int ret = 0;
618 1677
619 opterr = 0; 1678 opterr = 0;
620 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1679 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
621 switch (flag) { 1680 switch (i) {
622 1681
623 case 'V': 1682 case 'V':
624 printf("%s compiled %s\n%s\n" 1683 printf("pax-utils-%s: %s compiled %s\n%s\n"
625 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 1684 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
626 __FILE__, __DATE__, rcsid, argv0); 1685 VERSION, __FILE__, __DATE__, rcsid, argv0);
627 exit(EXIT_SUCCESS); 1686 exit(EXIT_SUCCESS);
628 break; 1687 break;
629 case 'h': usage(EXIT_SUCCESS); break; 1688 case 'h': usage(EXIT_SUCCESS); break;
630 1689 case 'f':
1690 if (from_file) warn("You prob don't want to specify -f twice");
1691 from_file = optarg;
1692 break;
1693 case 'E':
1694 strncpy(match_etypes, optarg, sizeof(match_etypes));
1695 break;
1696 case 'M':
1697 match_bits = atoi(optarg);
1698 break;
631 case 'o': { 1699 case 'o': {
632 FILE *fp = NULL;
633 fp = freopen(optarg, "w", stdout); 1700 if (freopen(optarg, "w", stdout) == NULL)
634 if (fp == NULL)
635 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 1701 err("Could not open output stream '%s': %s", optarg, strerror(errno));
636 stdout = fp;
637 break; 1702 break;
638 } 1703 }
639 1704 case 'k':
1705 if (find_section) warn("You prob don't want to specify -k twice");
1706 find_section = optarg;
1707 break;
640 case 's': { 1708 case 's': {
641 size_t len; 1709 if (find_sym) warn("You prob don't want to specify -s twice");
642 find_sym = xstrdup(optarg); 1710 find_sym = optarg;
643 len = strlen(find_sym) + 1;
644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); 1711 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
645 sprintf(versioned_symname, "%s@", find_sym); 1712 sprintf(versioned_symname, "%s@", find_sym);
646 break; 1713 break;
647 } 1714 }
1715 case 'N': {
1716 if (find_lib) warn("You prob don't want to specify -N twice");
1717 find_lib = optarg;
1718 break;
1719 }
648 1720
649 case 'F': { 1721 case 'F': {
1722 if (out_format) warn("You prob don't want to specify -F twice");
650 out_format = strdup(optarg); 1723 out_format = optarg;
651 break; 1724 break;
652 } 1725 }
1726 case 'z': {
1727 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1728 size_t x;
653 1729
1730 for (x = 0 ; x < strlen(optarg); x++) {
1731 switch(optarg[x]) {
1732 case 'p':
1733 case 'P':
1734 do_pax_state(optarg[x], PAGEEXEC);
1735 break;
1736 case 's':
1737 case 'S':
1738 do_pax_state(optarg[x], SEGMEXEC);
1739 break;
1740 case 'm':
1741 case 'M':
1742 do_pax_state(optarg[x], MPROTECT);
1743 break;
1744 case 'e':
1745 case 'E':
1746 do_pax_state(optarg[x], EMUTRAMP);
1747 break;
1748 case 'r':
1749 case 'R':
1750 do_pax_state(optarg[x], RANDMMAP);
1751 break;
1752 case 'x':
1753 case 'X':
1754 do_pax_state(optarg[x], RANDEXEC);
1755 break;
1756 default:
1757 break;
1758 }
1759 }
1760 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1761 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1762 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1763 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1764 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1765 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1766 setpax = flags;
1767 break;
1768 }
1769 case 'g': g_match = 1; break;
1770 case 'L': use_ldcache = 1; break;
654 case 'y': scan_symlink = 0; break; 1771 case 'y': scan_symlink = 0; break;
1772 case 'A': scan_archives = 1; break;
655 case 'B': show_banner = 0; break; 1773 case 'B': show_banner = 0; break;
656 case 'l': scan_ldpath = 1; break; 1774 case 'l': scan_ldpath = 1; break;
657 case 'p': scan_envpath = 1; break; 1775 case 'p': scan_envpath = 1; break;
658 case 'R': dir_recurse = 1; break; 1776 case 'R': dir_recurse = 1; break;
659 case 'm': dir_crossmount = 0; break; 1777 case 'm': dir_crossmount = 0; break;
1778 case 'X': ++fix_elf; break;
660 case 'x': show_pax = 1; break; 1779 case 'x': show_pax = 1; break;
661 case 'e': show_stack = 1; break; 1780 case 'e': show_phdr = 1; break;
662 case 't': show_textrel = 1; break; 1781 case 't': show_textrel = 1; break;
663 case 'r': show_rpath = 1; break; 1782 case 'r': show_rpath = 1; break;
664 case 'n': show_needed = 1; break; 1783 case 'n': show_needed = 1; break;
665 case 'i': show_interp = 1; break; 1784 case 'i': show_interp = 1; break;
1785 case 'b': show_bind = 1; break;
1786 case 'S': show_soname = 1; break;
1787 case 'T': show_textrels = 1; break;
666 case 'q': be_quiet = 1; break; 1788 case 'q': be_quiet = 1; break;
667 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1789 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; 1790 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
669 1791
670 case ':': 1792 case ':':
671 warn("Option missing parameter\n"); 1793 err("Option '%c' is missing parameter", optopt);
672 usage(EXIT_FAILURE);
673 break;
674 case '?': 1794 case '?':
675 warn("Unknown option\n"); 1795 err("Unknown option '%c' or argument missing", optopt);
676 usage(EXIT_FAILURE);
677 break;
678 default: 1796 default:
679 err("Unhandled option '%c'", flag); 1797 err("Unhandled option '%c'; please report this", i);
680 break;
681 }
682 } 1798 }
683 1799 }
684 if (be_quiet && be_verbose) 1800 if (show_textrels && be_verbose) {
685 err("You can be quiet or you can be verbose, not both, stupid"); 1801 if (which("objdump") != NULL)
686 1802 has_objdump = 1;
1803 }
687 /* let the format option override all other options */ 1804 /* let the format option override all other options */
688 if (out_format) { 1805 if (out_format) {
689 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; 1806 show_pax = show_phdr = show_textrel = show_rpath = \
1807 show_needed = show_interp = show_bind = show_soname = \
1808 show_textrels = 0;
690 for (flag=0; out_format[flag]; ++flag) { 1809 for (i = 0; out_format[i]; ++i) {
691 if (out_format[flag] != '%') continue; 1810 if (!IS_MODIFIER(out_format[i])) continue;
692 1811
693 switch (out_format[++flag]) { 1812 switch (out_format[++i]) {
1813 case '+': break;
694 case '%': break; 1814 case '%': break;
1815 case '#': break;
695 case 'F': break; 1816 case 'F': break;
1817 case 'p': break;
1818 case 'f': break;
1819 case 'k': break;
696 case 's': break; 1820 case 's': break;
1821 case 'N': break;
697 case 'o': break; 1822 case 'o': break;
1823 case 'a': break;
1824 case 'M': break;
698 case 'x': show_pax = 1; break; 1825 case 'x': show_pax = 1; break;
699 case 'e': show_stack = 1; break; 1826 case 'e': show_phdr = 1; break;
700 case 't': show_textrel = 1; break; 1827 case 't': show_textrel = 1; break;
701 case 'r': show_rpath = 1; break; 1828 case 'r': show_rpath = 1; break;
702 case 'n': show_needed = 1; break; 1829 case 'n': show_needed = 1; break;
703 case 'i': show_interp = 1; break; 1830 case 'i': show_interp = 1; break;
1831 case 'b': show_bind = 1; break;
1832 case 'S': show_soname = 1; break;
1833 case 'T': show_textrels = 1; break;
704 default: 1834 default:
705 err("Invalid format specifier '%c' (byte %i)", 1835 err("Invalid format specifier '%c' (byte %i)",
706 out_format[flag], flag+1); 1836 out_format[i], i+1);
707 } 1837 }
708 } 1838 }
709 1839
710 /* construct our default format */ 1840 /* construct our default format */
711 } else { 1841 } else {
712 size_t fmt_len = 30; 1842 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len); 1843 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); 1844 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); 1845 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); 1846 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); 1847 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); 1848 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); 1849 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); 1850 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1851 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1852 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1853 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); 1854 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1855 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1856 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); 1857 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
723 } 1858 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format); 1859 if (be_verbose > 2) printf("Format: %s\n", out_format);
725 1860
726 /* now lets actually do the scanning */ 1861 /* now lets actually do the scanning */
1862 if (scan_ldpath || use_ldcache)
1863 load_ld_cache_config(0, __PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
727 if (scan_ldpath) scanelf_ldpath(); 1864 if (scan_ldpath) scanelf_ldpath();
728 if (scan_envpath) scanelf_envpath(); 1865 if (scan_envpath) scanelf_envpath();
1866 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
1867 from_file = "-";
1868 if (from_file) {
1869 scanelf_from_file(from_file);
1870 from_file = *argv;
1871 }
729 if (optind == argc && !scan_ldpath && !scan_envpath) 1872 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
730 err("Nothing to scan !?"); 1873 err("Nothing to scan !?");
731 while (optind < argc) 1874 while (optind < argc) {
732 scanelf_dir(argv[optind++]); 1875 search_path = argv[optind++];
1876 ret = scanelf_dir(search_path);
1877 }
733 1878
734 /* clean up */ 1879 /* clean up */
735 if (find_sym) {
736 free(find_sym);
737 free(versioned_symname); 1880 free(versioned_symname);
1881 for (i = 0; ldpaths[i]; ++i)
1882 free(ldpaths[i]);
1883
1884 if (ldcache != 0)
1885 munmap(ldcache, ldcache_size);
1886 return ret;
1887}
1888
1889static char **get_split_env(const char *envvar)
1890{
1891 const char *delims = " \t\n";
1892 char **envvals = NULL;
1893 char *env, *s;
1894 int nentry;
1895
1896 if ((env = getenv(envvar)) == NULL)
1897 return NULL;
1898
1899 env = xstrdup(env);
1900 if (env == NULL)
1901 return NULL;
1902
1903 s = strtok(env, delims);
1904 if (s == NULL) {
1905 free(env);
1906 return NULL;
738 } 1907 }
739 if (out_format) free(out_format); 1908
1909 nentry = 0;
1910 while (s != NULL) {
1911 ++nentry;
1912 envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
1913 envvals[nentry-1] = s;
1914 s = strtok(NULL, delims);
1915 }
1916 envvals[nentry] = NULL;
1917
1918 /* don't want to free(env) as it contains the memory that backs
1919 * the envvals array of strings */
1920 return envvals;
1921}
1922static void parseenv()
1923{
1924 qa_textrels = get_split_env("QA_TEXTRELS");
1925 qa_execstack = get_split_env("QA_EXECSTACK");
1926 qa_wx_load = get_split_env("QA_WX_LOAD");
1927}
1928
1929#ifdef __PAX_UTILS_CLEANUP
1930static void cleanup()
1931{
1932 free(out_format);
1933 free(qa_textrels);
1934 free(qa_execstack);
1935 free(qa_wx_load);
1936}
1937#endif
1938
1939
1940int main(int argc, char *argv[])
1941{
1942 int ret;
1943 if (argc < 2)
1944 usage(EXIT_FAILURE);
1945 parseenv();
1946 ret = parseargs(argc, argv);
1947 fclose(stdout);
1948#ifdef __PAX_UTILS_CLEANUP
1949 cleanup();
1950 warn("The calls to add/delete heap should be off:\n"
1951 "\t- 1 due to the out_buffer not being freed in scanelf_file()\n"
1952 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
1953#endif
1954 return ret;
740} 1955}
741 1956
742 1957
743 1958
744/* utility funcs */ 1959/* utility funcs */
745static char *xstrdup(char *s) 1960static char *xstrdup(const char *s)
746{ 1961{
747 char *ret = strdup(s); 1962 char *ret = strdup(s);
748 if (!ret) err("Could not strdup(): %s", strerror(errno)); 1963 if (!ret) err("Could not strdup(): %s", strerror(errno));
749 return ret; 1964 return ret;
750} 1965}
752{ 1967{
753 void *ret = malloc(size); 1968 void *ret = malloc(size);
754 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); 1969 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
755 return ret; 1970 return ret;
756} 1971}
1972static void *xrealloc(void *ptr, size_t size)
1973{
1974 void *ret = realloc(ptr, size);
1975 if (!ret) err("Could not realloc() %li bytes", (unsigned long)size);
1976 return ret;
1977}
757static void xstrcat(char **dst, const char *src, size_t *curr_len) 1978static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
758{ 1979{
759 long new_len; 1980 size_t new_len;
760 1981
761 new_len = strlen(*dst) + strlen(src); 1982 new_len = strlen(*dst) + strlen(src);
762 if (*curr_len <= new_len) { 1983 if (*curr_len <= new_len) {
763 *curr_len = new_len + (*curr_len / 2); 1984 *curr_len = new_len + (*curr_len / 2);
764 *dst = realloc(*dst, *curr_len); 1985 *dst = realloc(*dst, *curr_len);
765 if (!*dst) 1986 if (!*dst)
766 err("could not realloc %li bytes", (unsigned long)*curr_len); 1987 err("could not realloc() %li bytes", (unsigned long)*curr_len);
767 } 1988 }
768 1989
1990 if (n)
1991 strncat(*dst, src, n);
1992 else
769 strcat(*dst, src); 1993 strcat(*dst, src);
770} 1994}
771static inline void xchrcat(char **dst, const char append, size_t *curr_len) 1995static inline void xchrcat(char **dst, const char append, size_t *curr_len)
772{ 1996{
773 static char my_app[2]; 1997 static char my_app[2];
774 my_app[0] = append; 1998 my_app[0] = append;
775 my_app[1] = '\0'; 1999 my_app[1] = '\0';
776 xstrcat(dst, my_app, curr_len); 2000 xstrcat(dst, my_app, curr_len);
777} 2001}
778static int xemptybuffer(const char *buff) 2002
2003/* Match filename against entries in matchlist, return TRUE
2004 * if the file is listed */
2005static int file_matches_list(const char *filename, char **matchlist)
779{ 2006{
780 long i; 2007 char **file;
781 for (i=0; buff[i]; ++i) 2008 char *match;
782 if (buff[i] != ' ') 2009 char buf[__PAX_UTILS_PATH_MAX];
2010
2011 if (matchlist == NULL)
783 return 0; 2012 return 0;
2013
2014 for (file = matchlist; *file != NULL; file++) {
2015 if (search_path) {
2016 snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2017 match = buf;
2018 } else {
2019 match = *file;
2020 }
2021 if (fnmatch(match, filename, 0) == 0)
784 return 1; 2022 return 1;
2023 }
2024 return 0;
785} 2025}
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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