/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.14 Revision 1.91
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 2 * Copyright 2003-2005 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 1.14 2005/04/01 19:56:34 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.91 2005/12/07 01:04:52 vapier Exp $
6 * 5 *
7 ******************************************************************** 6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org>
8 * This program is free software; you can redistribute it and/or 7 * Copyright 2004-2005 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> 10#include <stdio.h>
25#include <stdlib.h> 11#include <stdlib.h>
26#include <sys/types.h> 12#include <sys/types.h>
13#include <libgen.h>
14#include <limits.h>
15#define __USE_GNU
27#include <string.h> 16#include <string.h>
28#include <errno.h> 17#include <errno.h>
29#include <unistd.h> 18#include <unistd.h>
30#include <sys/stat.h> 19#include <sys/stat.h>
31#include <dirent.h> 20#include <dirent.h>
32#include <getopt.h> 21#include <getopt.h>
33 22#include <assert.h>
34#include "paxelf.h" 23#include "paxinc.h"
35 24
36static const char *rcsid = "$Id: scanelf.c,v 1.14 2005/04/01 19:56:34 vapier Exp $"; 25static const char *rcsid = "$Id: scanelf.c,v 1.91 2005/12/07 01:04:52 vapier Exp $";
26#define argv0 "scanelf"
37 27
38 28#define IS_MODIFIER(c) (c == '%' || c == '#')
39/* helper functions for showing errors */
40#define argv0 "scanelf\0" /*((*argv != NULL) ? argv[0] : __FILE__ "\b\b")*/
41#define warn(fmt, args...) \
42 fprintf(stderr, "%s: " fmt "\n", argv0, ## args)
43#define warnf(fmt, args...) warn("%s(): " fmt, __FUNCTION__, ## args)
44#define err(fmt, args...) \
45 do { \
46 warn(fmt, ## args); \
47 exit(EXIT_FAILURE); \
48 } while (0)
49 29
50 30
51 31
52/* prototypes */ 32/* prototypes */
53static void scanelf_file(const char *filename); 33static void scanelf_file(const char *filename);
54static void scanelf_dir(const char *path); 34static void scanelf_dir(const char *path);
55static void scanelf_ldpath(); 35static void scanelf_ldpath();
56static void scanelf_envpath(); 36static void scanelf_envpath();
57static void usage(int status); 37static void usage(int status);
58static void parseargs(int argc, char *argv[]); 38static void parseargs(int argc, char *argv[]);
39static char *xstrdup(const char *s);
40static void *xmalloc(size_t size);
41static void xstrcat(char **dst, const char *src, size_t *curr_len);
42static inline void xchrcat(char **dst, const char append, size_t *curr_len);
59 43
60/* variables to control behavior */ 44/* variables to control behavior */
45static char *ldpaths[256];
61static char scan_ldpath = 0; 46static char scan_ldpath = 0;
62static char scan_envpath = 0; 47static char scan_envpath = 0;
48static char scan_symlink = 1;
63static char dir_recurse = 0; 49static char dir_recurse = 0;
64static char dir_crossmount = 1; 50static char dir_crossmount = 1;
65static char show_pax = 0; 51static char show_pax = 0;
66static char show_stack = 0; 52static char show_phdr = 0;
67static char show_textrel = 0; 53static char show_textrel = 0;
68static char show_rpath = 0; 54static char show_rpath = 0;
55static char show_needed = 0;
56static char show_interp = 0;
57static char show_bind = 0;
58static char show_soname = 0;
59static char show_textrels = 0;
69static char show_header = 1; 60static char show_banner = 1;
70static char be_quiet = 0; 61static char be_quiet = 0;
71static char be_verbose = 0; 62static char be_verbose = 0;
63static char be_wewy_wewy_quiet = 0;
64static char *find_sym = NULL, *versioned_symname = NULL;
65static char *find_lib = NULL;
66static char *out_format = NULL;
67static char *search_path = NULL;
68static char gmatch = 0;
72 69
73 70
71/* sub-funcs for scanelf_file() */
72static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73{
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
75#define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
78 /* debug sections */ \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
81 /* runtime sections */ \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
84 if (symtab && dynsym) { \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
86 } else { \
87 *sym = (void*)(symtab ? symtab : dynsym); \
88 } \
89 if (strtab && dynstr) { \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
91 } else { \
92 *tab = (void*)(strtab ? strtab : dynstr); \
93 } \
94 }
95 GET_SYMTABS(32)
96 GET_SYMTABS(64)
97}
98static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99{
100 static char ret[7];
101 unsigned long i, shown;
74 102
103 if (!show_pax) return NULL;
104
105 shown = 0;
106 memset(&ret, 0, sizeof(ret));
107
108 if (elf->phdr) {
109#define SHOW_PAX(B) \
110 if (elf->elf_class == ELFCLASS ## B) { \
111 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
112 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
113 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
114 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
115 continue; \
116 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
117 continue; \
118 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found_pax = 1; \
120 ++shown; \
121 break; \
122 } \
123 }
124 SHOW_PAX(32)
125 SHOW_PAX(64)
126 }
127
128 /* fall back to EI_PAX if no PT_PAX was found */
129 if (!*ret) {
130 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1;
134 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 }
136 strncpy(ret, paxflags, sizeof(ret));
137 }
138
139 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL;
141 else
142 return ret;
143}
144
145static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
146{
147 static char ret[12];
148 char *found;
149 unsigned long i, shown;
150 unsigned char multi_stack, multi_relro, multi_load;
151
152 if (!show_phdr) return NULL;
153
154 memcpy(ret, "--- --- ---\0", 12);
155
156 shown = 0;
157 multi_stack = multi_relro = multi_load = 0;
158
159#define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
162 Elf ## B ## _Off offset; \
163 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
169 found = found_phdr; \
170 offset = 0; \
171 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \
175 offset = 4; \
176 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \
179 found = found_load; \
180 offset = 8; \
181 check_flags = PF_W|PF_X; \
182 } else \
183 continue; \
184 flags = EGET(phdr[i].p_flags); \
185 if (be_quiet && ((flags & check_flags) != check_flags)) \
186 continue; \
187 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
188 *found = 1; \
189 ++shown; \
190 } \
191 } else if (elf->shdr != NULL) { \
192 /* no program headers which means this is prob an object file */ \
193 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
194 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
195 check_flags = SHF_WRITE|SHF_EXECINSTR; \
196 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
197 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
198 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
199 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \
200 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
201 flags = EGET(shdr[i].sh_flags); \
202 if (be_quiet && ((flags & check_flags) != check_flags)) \
203 continue; \
204 ++*found_phdr; \
205 shown = 1; \
206 if (flags & SHF_WRITE) ret[0] = 'W'; \
207 if (flags & SHF_ALLOC) ret[1] = 'A'; \
208 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
209 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
210 break; \
211 } \
212 } \
213 if (!multi_stack) { \
214 *found_phdr = 1; \
215 shown = 1; \
216 memcpy(ret, "!WX", 3); \
217 } \
218 } \
219 }
220 SHOW_PHDR(32)
221 SHOW_PHDR(64)
222
223 if (be_wewy_wewy_quiet || (be_quiet && !shown))
224 return NULL;
225 else
226 return ret;
227}
228static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
229{
230 static const char *ret = "TEXTREL";
231 unsigned long i;
232
233 if (!show_textrel && !show_textrels) return NULL;
234
235 if (elf->phdr) {
236#define SHOW_TEXTREL(B) \
237 if (elf->elf_class == ELFCLASS ## B) { \
238 Elf ## B ## _Dyn *dyn; \
239 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
240 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
241 Elf ## B ## _Off offset; \
242 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
243 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
244 offset = EGET(phdr[i].p_offset); \
245 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
246 dyn = DYN ## B (elf->data + offset); \
247 while (EGET(dyn->d_tag) != DT_NULL) { \
248 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
249 *found_textrel = 1; \
250 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
251 return (be_wewy_wewy_quiet ? NULL : ret); \
252 } \
253 ++dyn; \
254 } \
255 } }
256 SHOW_TEXTREL(32)
257 SHOW_TEXTREL(64)
258 }
259
260 if (be_quiet || be_wewy_wewy_quiet)
261 return NULL;
262 else
263 return " - ";
264}
265static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
266{
267 unsigned long s, r, rmax;
268 void *symtab_void, *strtab_void, *text_void;
269
270 if (!show_textrels) return NULL;
271
272 /* don't search for TEXTREL's if the ELF doesn't have any */
273 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
274 if (!*found_textrel) return NULL;
275
276 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
277 text_void = elf_findsecbyname(elf, ".text");
278
279 if (symtab_void && strtab_void && text_void && elf->shdr) {
280#define SHOW_TEXTRELS(B) \
281 if (elf->elf_class == ELFCLASS ## B) { \
282 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
283 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
284 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
285 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
286 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
287 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
288 uint ## B ## _t memsz = EGET(text->sh_size); \
289 Elf ## B ## _Rel *rel; \
290 Elf ## B ## _Rela *rela; \
291 /* search the section headers for relocations */ \
292 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
293 uint32_t sh_type = EGET(shdr[s].sh_type); \
294 if (sh_type == SHT_REL) { \
295 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
296 rela = NULL; \
297 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
298 } else if (sh_type == SHT_RELA) { \
299 rel = NULL; \
300 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
301 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
302 } else \
303 continue; \
304 /* now see if any of the relocs are in the .text */ \
305 for (r = 0; r < rmax; ++r) { \
306 unsigned long sym_max; \
307 Elf ## B ## _Addr offset_tmp; \
308 Elf ## B ## _Sym *func; \
309 Elf ## B ## _Sym *sym; \
310 Elf ## B ## _Addr r_offset; \
311 uint ## B ## _t r_info; \
312 if (sh_type == SHT_REL) { \
313 r_offset = EGET(rel[r].r_offset); \
314 r_info = EGET(rel[r].r_info); \
315 } else { \
316 r_offset = EGET(rela[r].r_offset); \
317 r_info = EGET(rela[r].r_info); \
318 } \
319 /* make sure this relocation is inside of the .text */ \
320 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
321 if (be_verbose <= 2) continue; \
322 } else \
323 *found_textrels = 1; \
324 /* locate this relocation symbol name */ \
325 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
326 sym_max = ELF ## B ## _R_SYM(r_info); \
327 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
328 sym += sym_max; \
329 else \
330 sym = NULL; \
331 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
332 /* show the raw details about this reloc */ \
333 printf(" %s: ", elf->base_filename); \
334 if (sym && sym->st_name) \
335 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
336 else \
337 printf("(memory/fake?)"); \
338 printf(" [0x%lX]", (unsigned long)r_offset); \
339 /* now try to find the closest symbol that this rel is probably in */ \
340 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
341 func = NULL; \
342 offset_tmp = 0; \
343 while (sym_max--) { \
344 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
345 func = sym; \
346 offset_tmp = EGET(sym->st_value); \
347 } \
348 ++sym; \
349 } \
350 printf(" in "); \
351 if (func && func->st_name) \
352 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
353 else \
354 printf("(NULL: fake?)"); \
355 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
356 } \
357 } }
358 SHOW_TEXTRELS(32)
359 SHOW_TEXTRELS(64)
360 }
361 if (!*found_textrels)
362 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
363
364 return NULL;
365}
366
367static void rpath_security_checks(elfobj *, char *);
368static void rpath_security_checks(elfobj *elf, char *item) {
369 struct stat st;
370 switch (*item) {
371 case '/': break;
372 case '.':
373 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename);
374 break;
375 case '\0':
376 warnf("Security problem NULL RPATH in %s", elf->filename);
377 break;
378 case '$':
379 if (fstat(elf->fd, &st) != -1)
380 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
381 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
382 item, elf->filename, st.st_mode & 07777);
383 break;
384 default:
385 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
386 break;
387 }
388}
389static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
390{
391 unsigned long i, s;
392 char *rpath, *runpath, **r;
393 void *strtbl_void;
394
395 if (!show_rpath) return;
396
397 strtbl_void = elf_findsecbyname(elf, ".dynstr");
398 rpath = runpath = NULL;
399
400 if (elf->phdr && strtbl_void) {
401#define SHOW_RPATH(B) \
402 if (elf->elf_class == ELFCLASS ## B) { \
403 Elf ## B ## _Dyn *dyn; \
404 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
405 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
406 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
407 Elf ## B ## _Off offset; \
408 Elf ## B ## _Xword word; \
409 /* Scan all the program headers */ \
410 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
411 /* Just scan dynamic headers */ \
412 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
413 offset = EGET(phdr[i].p_offset); \
414 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
415 /* Just scan dynamic RPATH/RUNPATH headers */ \
416 dyn = DYN ## B (elf->data + offset); \
417 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
418 if (word == DT_RPATH) { \
419 r = &rpath; \
420 } else if (word == DT_RUNPATH) { \
421 r = &runpath; \
422 } else { \
423 ++dyn; \
424 continue; \
425 } \
426 /* Verify the memory is somewhat sane */ \
427 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
428 if (offset < (Elf ## B ## _Off)elf->len) { \
429 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
430 *r = (char*)(elf->data + offset); \
431 /* If quiet, don't output paths in ld.so.conf */ \
432 if (be_quiet) { \
433 size_t len; \
434 char *start, *end; \
435 /* note that we only 'chop' off leading known paths. */ \
436 /* since *r is read-only memory, we can only move the ptr forward. */ \
437 start = *r; \
438 /* scan each path in : delimited list */ \
439 while (start) { \
440 rpath_security_checks(elf, start); \
441 end = strchr(start, ':'); \
442 len = (end ? abs(end - start) : strlen(start)); \
443 for (s = 0; ldpaths[s]; ++s) { \
444 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
445 *r = (end ? end + 1 : NULL); \
446 break; \
447 } \
448 } \
449 if (!*r || !ldpaths[s] || !end) \
450 start = NULL; \
451 else \
452 start = start + len + 1; \
453 } \
454 } \
455 if (*r) *found_rpath = 1; \
456 } \
457 ++dyn; \
458 } \
459 } }
460 SHOW_RPATH(32)
461 SHOW_RPATH(64)
462 }
463
464 if (be_wewy_wewy_quiet) return;
465
466 if (rpath && runpath) {
467 if (!strcmp(rpath, runpath)) {
468 xstrcat(ret, runpath, ret_len);
469 } else {
470 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
471 xchrcat(ret, '{', ret_len);
472 xstrcat(ret, rpath, ret_len);
473 xchrcat(ret, ',', ret_len);
474 xstrcat(ret, runpath, ret_len);
475 xchrcat(ret, '}', ret_len);
476 }
477 } else if (rpath || runpath)
478 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
479 else if (!be_quiet)
480 xstrcat(ret, " - ", ret_len);
481}
482static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
483{
484 unsigned long i;
485 char *needed;
486 void *strtbl_void;
487
488 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
489
490 strtbl_void = elf_findsecbyname(elf, ".dynstr");
491
492 if (elf->phdr && strtbl_void) {
493#define SHOW_NEEDED(B) \
494 if (elf->elf_class == ELFCLASS ## B) { \
495 Elf ## B ## _Dyn *dyn; \
496 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
497 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
498 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
499 Elf ## B ## _Off offset; \
500 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
501 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
502 offset = EGET(phdr[i].p_offset); \
503 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
504 dyn = DYN ## B (elf->data + offset); \
505 while (EGET(dyn->d_tag) != DT_NULL) { \
506 if (EGET(dyn->d_tag) == DT_NEEDED) { \
507 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
508 if (offset >= (Elf ## B ## _Off)elf->len) { \
509 ++dyn; \
510 continue; \
511 } \
512 needed = (char*)(elf->data + offset); \
513 if (op == 0) { \
514 if (!be_wewy_wewy_quiet) { \
515 if (*found_needed) xchrcat(ret, ',', ret_len); \
516 xstrcat(ret, needed, ret_len); \
517 } \
518 *found_needed = 1; \
519 } else { \
520 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
521 *found_lib = 1; \
522 return (be_wewy_wewy_quiet ? NULL : needed); \
523 } \
524 } \
525 } \
526 ++dyn; \
527 } \
528 } }
529 SHOW_NEEDED(32)
530 SHOW_NEEDED(64)
531 if (op == 0 && !*found_needed && be_verbose)
532 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
533 }
534
535 return NULL;
536}
537static char *scanelf_file_interp(elfobj *elf, char *found_interp)
538{
539 void *strtbl_void;
540
541 if (!show_interp) return NULL;
542
543 strtbl_void = elf_findsecbyname(elf, ".interp");
544
545 if (strtbl_void) {
546#define SHOW_INTERP(B) \
547 if (elf->elf_class == ELFCLASS ## B) { \
548 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
549 *found_interp = 1; \
550 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
551 }
552 SHOW_INTERP(32)
553 SHOW_INTERP(64)
554 }
555 return NULL;
556}
557static char *scanelf_file_bind(elfobj *elf, char *found_bind)
558{
559 unsigned long i;
560 struct stat s;
561
562 if (!show_bind) return NULL;
563 if (!elf->phdr) return NULL;
564
565#define SHOW_BIND(B) \
566 if (elf->elf_class == ELFCLASS ## B) { \
567 Elf ## B ## _Dyn *dyn; \
568 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
569 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
570 Elf ## B ## _Off offset; \
571 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
572 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
573 offset = EGET(phdr[i].p_offset); \
574 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
575 dyn = DYN ## B (elf->data + offset); \
576 while (EGET(dyn->d_tag) != DT_NULL) { \
577 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
578 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
579 { \
580 if (be_quiet) return NULL; \
581 *found_bind = 1; \
582 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
583 } \
584 ++dyn; \
585 } \
586 } \
587 }
588 SHOW_BIND(32)
589 SHOW_BIND(64)
590
591 if (be_wewy_wewy_quiet) return NULL;
592
593 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
594 return NULL;
595 } else {
596 *found_bind = 1;
597 return (char *) "LAZY";
598 }
599}
600static char *scanelf_file_soname(elfobj *elf, char *found_soname)
601{
602 unsigned long i;
603 char *soname;
604 void *strtbl_void;
605
606 if (!show_soname) return NULL;
607
608 strtbl_void = elf_findsecbyname(elf, ".dynstr");
609
610 if (elf->phdr && strtbl_void) {
611#define SHOW_SONAME(B) \
612 if (elf->elf_class == ELFCLASS ## B) { \
613 Elf ## B ## _Dyn *dyn; \
614 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
615 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
616 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
617 Elf ## B ## _Off offset; \
618 /* only look for soname in shared objects */ \
619 if (ehdr->e_type != ET_DYN) \
620 return NULL; \
621 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
622 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
623 offset = EGET(phdr[i].p_offset); \
624 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
625 dyn = DYN ## B (elf->data + offset); \
626 while (EGET(dyn->d_tag) != DT_NULL) { \
627 if (EGET(dyn->d_tag) == DT_SONAME) { \
628 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
629 if (offset >= (Elf ## B ## _Off)elf->len) { \
630 ++dyn; \
631 continue; \
632 } \
633 soname = (char*)(elf->data + offset); \
634 *found_soname = 1; \
635 return (be_wewy_wewy_quiet ? NULL : soname); \
636 } \
637 ++dyn; \
638 } \
639 } }
640 SHOW_SONAME(32)
641 SHOW_SONAME(64)
642 }
643
644 return NULL;
645}
646static char *scanelf_file_sym(elfobj *elf, char *found_sym)
647{
648 unsigned long i;
649 void *symtab_void, *strtab_void;
650
651 if (!find_sym) return NULL;
652
653 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
654
655 if (symtab_void && strtab_void) {
656#define FIND_SYM(B) \
657 if (elf->elf_class == ELFCLASS ## B) { \
658 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
659 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
660 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
661 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
662 char *symname; \
663 for (i = 0; i < cnt; ++i) { \
664 if (sym->st_name) { \
665 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
666 if (*find_sym == '*') { \
667 printf("%s(%s) %5lX %15s %s\n", \
668 ((*found_sym == 0) ? "\n\t" : "\t"), \
669 elf->base_filename, \
670 (long)sym->st_size, \
671 (char *)get_elfstttype(sym->st_info), \
672 symname); \
673 *found_sym = 1; \
674 } else if ((strcmp(find_sym, symname) == 0) || \
675 (strcmp(symname, versioned_symname) == 0)) \
676 (*found_sym)++; \
677 } \
678 ++sym; \
679 } }
680 FIND_SYM(32)
681 FIND_SYM(64)
682 }
683
684 if (be_wewy_wewy_quiet) return NULL;
685
686 if (*find_sym != '*' && *found_sym)
687 return find_sym;
688 if (be_quiet)
689 return NULL;
690 else
691 return (char *)" - ";
692}
75/* scan an elf file and show all the fun stuff */ 693/* scan an elf file and show all the fun stuff */
694#define prints(str) write(fileno(stdout), str, strlen(str))
76static void scanelf_file(const char *filename) 695static void scanelf_file(const char *filename)
77{ 696{
78 int i; 697 unsigned long i;
79 char found_pax, found_stack, found_relro, found_textrel, found_rpath; 698 char found_pax, found_phdr, found_relro, found_load, found_textrel,
80 Elf_Dyn *dyn; 699 found_rpath, found_needed, found_interp, found_bind, found_soname,
700 found_sym, found_lib, found_file, found_textrels;
81 elfobj *elf = NULL; 701 elfobj *elf;
702 struct stat st;
703 static char *out_buffer = NULL;
704 static size_t out_len;
82 705
83 found_pax = found_stack = found_relro = found_textrel = found_rpath = 0; 706 /* make sure 'filename' exists */
707 if (lstat(filename, &st) == -1) {
708 if (be_verbose > 2) printf("%s: does not exist\n", filename);
709 return;
710 }
711 /* always handle regular files and handle symlinked files if no -y */
712 if (S_ISLNK(st.st_mode)) {
713 if (!scan_symlink) return;
714 stat(filename, &st);
715 }
716 if (!S_ISREG(st.st_mode)) {
717 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
718 return;
719 }
720
721 found_pax = found_phdr = found_relro = found_load = found_textrel = \
722 found_rpath = found_needed = found_interp = found_bind = found_soname = \
723 found_sym = found_lib = found_file = found_textrels = 0;
84 724
85 /* verify this is real ELF */ 725 /* verify this is real ELF */
86 if ((elf = readelf(filename)) == NULL) { 726 if ((elf = readelf(filename)) == NULL) {
87 if (be_verbose > 1) printf("File '%s' is not an ELF\n", filename); 727 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
88 return; 728 return;
89 } 729 }
90 if (check_elf_header(elf->ehdr) || !IS_ELF(elf)) {
91 if (be_verbose > 1) printf("Cannot handle ELF '%s' :(\n", filename);
92 goto bail;
93 }
94 730
95 if (be_verbose) printf("Scanning file %s\n", filename); 731 if (be_verbose > 1)
732 printf("%s: scanning file {%s,%s}\n", filename,
733 get_elfeitype(EI_CLASS, elf->elf_class),
734 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
735 else if (be_verbose)
736 printf("%s: scanning file\n", filename);
737
738 /* init output buffer */
739 if (!out_buffer) {
740 out_len = sizeof(char) * 80;
741 out_buffer = (char*)xmalloc(out_len);
742 }
743 *out_buffer = '\0';
96 744
97 /* show the header */ 745 /* show the header */
98 if (!be_quiet && show_header) { 746 if (!be_quiet && show_banner) {
99 fputs(" TYPE ", stdout); 747 for (i = 0; out_format[i]; ++i) {
100 if (show_pax) fputs(" PAX ", stdout); 748 if (!IS_MODIFIER(out_format[i])) continue;
101 if (show_stack) fputs(" STK/REL ", stdout);
102 if (show_textrel) fputs("TEXTREL ", stdout);
103 if (show_rpath) fputs("RPATH ", stdout);
104 fputs(" FILE\n", stdout);
105 show_header = 0;
106 }
107 749
108 /* dump all the good stuff */ 750 switch (out_format[++i]) {
109 if (!be_quiet) 751 case '%': break;
110 printf("%-7s ", get_elfetype(elf->ehdr->e_type)); 752 case '#': break;
111 753 case 'F':
112 if (show_pax) { 754 case 'p':
113 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf)); 755 case 'f': prints("FILE "); found_file = 1; break;
114 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) { 756 case 'o': prints(" TYPE "); break;
115 found_pax = 1; 757 case 'x': prints(" PAX "); break;
116 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf))); 758 case 'e': prints("STK/REL/PTL "); break;
117 } 759 case 't': prints("TEXTREL "); break;
118 } 760 case 'r': prints("RPATH "); break;
119 761 case 'n': prints("NEEDED "); break;
120 /* stack fun */ 762 case 'i': prints("INTERP "); break;
121 if (show_stack) { 763 case 'b': prints("BIND "); break;
122 for (i = 0; i < elf->ehdr->e_phnum; i++) { 764 case 'S': prints("SONAME "); break;
123 if (elf->phdr[i].p_type != PT_GNU_STACK && \ 765 case 's': prints("SYM "); break;
124 elf->phdr[i].p_type != PT_GNU_RELRO) continue; 766 case 'N': prints("LIB "); break;
125 767 case 'T': prints("TEXTRELS "); break;
126 if (be_quiet && !(elf->phdr[i].p_flags & PF_X)) 768 default: warnf("'%c' has no title ?", out_format[i]);
127 continue;
128
129 if (elf->phdr[i].p_type == PT_GNU_STACK)
130 found_stack = 1;
131 if (elf->phdr[i].p_type == PT_GNU_RELRO)
132 found_relro = 1;
133
134 printf("%s ", gnu_short_stack_flags(elf->phdr[i].p_flags));
135 }
136 if (!be_quiet && !found_stack) fputs("--- ", stdout);
137 if (!be_quiet && !found_relro) fputs("--- ", stdout);
138 }
139
140 /* textrel fun */
141 if (show_textrel) {
142 for (i = 0; i < elf->ehdr->e_phnum; i++) {
143 if (elf->phdr[i].p_type != PT_DYNAMIC) continue;
144
145 dyn = (Elf_Dyn *)(elf->data + elf->phdr[i].p_offset);
146 while (dyn->d_tag != DT_NULL) {
147 if (dyn->d_tag == DT_TEXTREL) { //dyn->d_tag != DT_FLAGS)
148 found_textrel = 1;
149// if (dyn->d_un.d_val & DF_TEXTREL)
150 fputs("TEXTREL ", stdout);
151 }
152 ++dyn;
153 } 769 }
154 } 770 }
155 if (!be_quiet && !found_textrel) fputs("------- ", stdout); 771 if (!found_file) prints("FILE ");
772 prints("\n");
773 found_file = 0;
774 show_banner = 0;
775 }
776
777 /* dump all the good stuff */
778 for (i = 0; out_format[i]; ++i) {
779 const char *out;
780 const char *tmp;
781
782 /* make sure we trim leading spaces in quiet mode */
783 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
784 *out_buffer = '\0';
785
786 if (!IS_MODIFIER(out_format[i])) {
787 xchrcat(&out_buffer, out_format[i], &out_len);
788 continue;
156 } 789 }
157 790
158 /* rpath fun */ 791 out = NULL;
159 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 792 be_wewy_wewy_quiet = (out_format[i] == '#');
793 switch (out_format[++i]) {
794 case '%':
795 case '#':
796 xchrcat(&out_buffer, out_format[i], &out_len); break;
797 case 'F':
798 found_file = 1;
799 if (be_wewy_wewy_quiet) break;
800 xstrcat(&out_buffer, filename, &out_len);
801 break;
802 case 'p':
803 found_file = 1;
804 if (be_wewy_wewy_quiet) break;
805 tmp = filename;
160 if (show_rpath) { 806 if (search_path) {
161 Elf_Shdr *strtbl = elf_findsecbyname(elf, ".dynstr"); 807 ssize_t len_search = strlen(search_path);
162 808 ssize_t len_file = strlen(filename);
163 if (strtbl) 809 if (!strncmp(filename, search_path, len_search) && \
164 for (i = 0; i < elf->ehdr->e_phnum; i++) { 810 len_file > len_search)
165 if (elf->phdr[i].p_type != PT_DYNAMIC) continue; 811 tmp += len_search;
166 812 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
167 dyn = (Elf_Dyn *)(elf->data + elf->phdr[i].p_offset);
168 while (dyn->d_tag != DT_NULL) {
169 if (dyn->d_tag == DT_RPATH) { //|| dyn->d_tag != DT_RUNPATH)
170 char *rpath = elf->data + strtbl->sh_offset + dyn->d_un.d_ptr;
171 found_rpath = 1;
172 printf("%s ", rpath);
173 }
174 ++dyn;
175 } 813 }
814 xstrcat(&out_buffer, tmp, &out_len);
815 break;
816 case 'f':
817 found_file = 1;
818 if (be_wewy_wewy_quiet) break;
819 tmp = strrchr(filename, '/');
820 tmp = (tmp == NULL ? filename : tmp+1);
821 xstrcat(&out_buffer, tmp, &out_len);
822 break;
823 case 'o': out = get_elfetype(elf); break;
824 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
825 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
826 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
827 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
828 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
829 case 'n':
830 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
831 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
832 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
833 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
834 case 's': out = scanelf_file_sym(elf, &found_sym); break;
835 default: warnf("'%c' has no scan code?", out_format[i]);
176 } 836 }
177 if (!be_quiet && !found_rpath) fputs(" - ", stdout); 837 if (out) xstrcat(&out_buffer, out, &out_len);
178 } 838 }
179 839
180 if (!be_quiet || found_pax || found_stack || found_textrel || found_rpath) 840#define FOUND_SOMETHING() \
181 puts(filename); 841 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
842 found_rpath || found_needed || found_interp || found_bind || \
843 found_soname || found_sym || found_lib || found_textrels)
182 844
183bail: 845 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
846 xchrcat(&out_buffer, ' ', &out_len);
847 xstrcat(&out_buffer, filename, &out_len);
848 }
849 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
850 puts(out_buffer);
851 fflush(stdout);
852 }
853
184 unreadelf(elf); 854 unreadelf(elf);
185} 855}
186 856
187/* scan a directory for ET_EXEC files and print when we find one */ 857/* scan a directory for ET_EXEC files and print when we find one */
188static void scanelf_dir(const char *path) 858static void scanelf_dir(const char *path)
189{ 859{
190 register DIR *dir; 860 register DIR *dir;
191 register struct dirent *dentry; 861 register struct dirent *dentry;
192 struct stat st_top, st; 862 struct stat st_top, st;
193 char *p; 863 char buf[_POSIX_PATH_MAX];
194 int len = 0; 864 size_t pathlen = 0, len = 0;
195 865
196 /* make sure path exists */ 866 /* make sure path exists */
197 if (lstat(path, &st_top) == -1) 867 if (lstat(path, &st_top) == -1) {
868 if (be_verbose > 2) printf("%s: does not exist\n", path);
198 return; 869 return;
870 }
199 871
200 /* ok, if it isn't a directory, assume we can open it */ 872 /* ok, if it isn't a directory, assume we can open it */
201 if (!S_ISDIR(st_top.st_mode)) { 873 if (!S_ISDIR(st_top.st_mode)) {
202 scanelf_file(path); 874 scanelf_file(path);
203 return; 875 return;
206 /* now scan the dir looking for fun stuff */ 878 /* now scan the dir looking for fun stuff */
207 if ((dir = opendir(path)) == NULL) { 879 if ((dir = opendir(path)) == NULL) {
208 warnf("could not opendir %s: %s", path, strerror(errno)); 880 warnf("could not opendir %s: %s", path, strerror(errno));
209 return; 881 return;
210 } 882 }
211 if (be_verbose) printf("Scanning dir %s\n", path); 883 if (be_verbose) printf("%s: scanning dir\n", path);
212 884
885 pathlen = strlen(path);
213 while ((dentry = readdir(dir))) { 886 while ((dentry = readdir(dir))) {
214 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 887 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
215 continue; 888 continue;
216 len = (strlen(path) + 2 + strlen(dentry->d_name)); 889 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
217 p = malloc(len); 890 if (len >= sizeof(buf)) {
218 if (!p) 891 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
219 err("scanelf_dir(): Could not malloc: %s", strerror(errno)); 892 (unsigned long)len, (unsigned long)sizeof(buf));
220 strncpy(p, path, len); 893 continue;
221 strncat(p, "/", len); 894 }
222 strncat(p, dentry->d_name, len); 895 sprintf(buf, "%s/%s", path, dentry->d_name);
223 if (lstat(p, &st) != -1) { 896 if (lstat(buf, &st) != -1) {
224 if (S_ISREG(st.st_mode)) 897 if (S_ISREG(st.st_mode))
225 scanelf_file(p); 898 scanelf_file(buf);
226 else if (dir_recurse && S_ISDIR(st.st_mode)) { 899 else if (dir_recurse && S_ISDIR(st.st_mode)) {
227 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 900 if (dir_crossmount || (st_top.st_dev == st.st_dev))
228 scanelf_dir(p); 901 scanelf_dir(buf);
229 } 902 }
230 } 903 }
231 free(p);
232 } 904 }
233 closedir(dir); 905 closedir(dir);
906}
907
908static int scanelf_from_file(char *filename)
909{
910 FILE *fp = NULL;
911 char *p;
912 char path[_POSIX_PATH_MAX];
913
914 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
915 fp = stdin;
916 else if ((fp = fopen(filename, "r")) == NULL)
917 return 1;
918
919 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
920 if ((p = strchr(path, '\n')) != NULL)
921 *p = 0;
922 search_path = path;
923 scanelf_dir(path);
924 }
925 if (fp != stdin)
926 fclose(fp);
927 return 0;
928}
929
930static void load_ld_so_conf()
931{
932 FILE *fp = NULL;
933 char *p;
934 char path[_POSIX_PATH_MAX];
935 int i = 0;
936
937 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
938 return;
939
940 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
941 if (*path != '/')
942 continue;
943
944 if ((p = strrchr(path, '\r')) != NULL)
945 *p = 0;
946 if ((p = strchr(path, '\n')) != NULL)
947 *p = 0;
948
949 ldpaths[i++] = xstrdup(path);
950
951 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
952 break;
953 }
954 ldpaths[i] = NULL;
955
956 fclose(fp);
234} 957}
235 958
236/* scan /etc/ld.so.conf for paths */ 959/* scan /etc/ld.so.conf for paths */
237static void scanelf_ldpath() 960static void scanelf_ldpath()
238{ 961{
239 char *path, *p; 962 char scan_l, scan_ul, scan_ull;
240 FILE *fp; 963 int i = 0;
241 964
242 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 965 if (!ldpaths[0])
243 err("Unable to open ld.so.conf: %s", strerror(errno)); 966 err("Unable to load any paths from ld.so.conf");
244 967
245 path = malloc(_POSIX_PATH_MAX); 968 scan_l = scan_ul = scan_ull = 0;
246 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) 969
247 if (*path == '/') { 970 while (ldpaths[i]) {
248 if ((p = strrchr(path, '\r')) != NULL) 971 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
249 *p = 0; 972 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
250 if ((p = strrchr(path, '\n')) != NULL) 973 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
251 *p = 0;
252 scanelf_dir(path); 974 scanelf_dir(ldpaths[i]);
975 ++i;
253 } 976 }
254 free(path);
255 977
256 fclose(fp); 978 if (!scan_l) scanelf_dir("/lib");
979 if (!scan_ul) scanelf_dir("/usr/lib");
980 if (!scan_ull) scanelf_dir("/usr/local/lib");
257} 981}
258 982
259/* scan env PATH for paths */ 983/* scan env PATH for paths */
260static void scanelf_envpath() 984static void scanelf_envpath()
261{ 985{
262 char *path, *p; 986 char *path, *p;
263 987
264 path = getenv("PATH"); 988 path = getenv("PATH");
265 if (!path) 989 if (!path)
266 err("PATH is not set in your env !"); 990 err("PATH is not set in your env !");
267 991 path = xstrdup(path);
268 if ((path = strdup(path)) == NULL)
269 err("stdup failed: %s", strerror(errno));
270 992
271 while ((p = strrchr(path, ':')) != NULL) { 993 while ((p = strrchr(path, ':')) != NULL) {
272 scanelf_dir(p + 1); 994 scanelf_dir(p + 1);
273 *p = 0; 995 *p = 0;
274 } 996 }
997
275 free(path); 998 free(path);
276} 999}
277 1000
278 1001
279 1002
280/* usage / invocation handling functions */ 1003/* usage / invocation handling functions */
281#define PARSE_FLAGS "plRmxstraqvHhV" 1004#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV"
1005#define a_argument required_argument
282static struct option const long_opts[] = { 1006static struct option const long_opts[] = {
283 {"path", no_argument, NULL, 'p'}, 1007 {"path", no_argument, NULL, 'p'},
284 {"ldpath", no_argument, NULL, 'l'}, 1008 {"ldpath", no_argument, NULL, 'l'},
285 {"recursive", no_argument, NULL, 'R'}, 1009 {"recursive", no_argument, NULL, 'R'},
286 {"mount", no_argument, NULL, 'm'}, 1010 {"mount", no_argument, NULL, 'm'},
1011 {"symlink", no_argument, NULL, 'y'},
287 {"pax", no_argument, NULL, 'x'}, 1012 {"pax", no_argument, NULL, 'x'},
288 {"stack", no_argument, NULL, 's'}, 1013 {"header", no_argument, NULL, 'e'},
289 {"textrel", no_argument, NULL, 't'}, 1014 {"textrel", no_argument, NULL, 't'},
290 {"rpath", no_argument, NULL, 'r'}, 1015 {"rpath", no_argument, NULL, 'r'},
1016 {"needed", no_argument, NULL, 'n'},
1017 {"interp", no_argument, NULL, 'i'},
1018 {"bind", no_argument, NULL, 'b'},
1019 {"soname", no_argument, NULL, 'S'},
1020 {"symbol", a_argument, NULL, 's'},
1021 {"lib", a_argument, NULL, 'N'},
1022 {"gmatch", no_argument, NULL, 'g'},
1023 {"textrels", no_argument, NULL, 'T'},
291 {"all", no_argument, NULL, 'a'}, 1024 {"all", no_argument, NULL, 'a'},
292 {"quiet", no_argument, NULL, 'q'}, 1025 {"quiet", no_argument, NULL, 'q'},
293 {"verbose", no_argument, NULL, 'v'}, 1026 {"verbose", no_argument, NULL, 'v'},
1027 {"format", a_argument, NULL, 'F'},
1028 {"from", a_argument, NULL, 'f'},
1029 {"file", a_argument, NULL, 'o'},
294 {"noheader", no_argument, NULL, 'H'}, 1030 {"nobanner", no_argument, NULL, 'B'},
295 {"help", no_argument, NULL, 'h'}, 1031 {"help", no_argument, NULL, 'h'},
296 {"version", no_argument, NULL, 'V'}, 1032 {"version", no_argument, NULL, 'V'},
297 {NULL, no_argument, NULL, 0x0} 1033 {NULL, no_argument, NULL, 0x0}
298}; 1034};
1035
299static char *opts_help[] = { 1036static const char *opts_help[] = {
300 "Scan all directories in PATH environment", 1037 "Scan all directories in PATH environment",
301 "Scan all directories in /etc/ld.so.conf", 1038 "Scan all directories in /etc/ld.so.conf",
302 "Scan directories recursively", 1039 "Scan directories recursively",
303 "Don't recursively cross mount points\n", 1040 "Don't recursively cross mount points",
1041 "Don't scan symlinks\n",
304 "Print PaX markings", 1042 "Print PaX markings",
305 "Print GNU_STACK markings", 1043 "Print GNU_STACK/PT_LOAD markings",
306 "Print TEXTREL information", 1044 "Print TEXTREL information",
307 "Print RPATH information", 1045 "Print RPATH information",
1046 "Print NEEDED information",
1047 "Print INTERP information",
1048 "Print BIND information",
1049 "Print SONAME information",
1050 "Find a specified symbol",
1051 "Find a specified library",
1052 "Use strncmp to match libraries. (use with -N)",
1053 "Locate cause of TEXTREL",
308 "Print all scanned info (-x -s -t -r)\n", 1054 "Print all scanned info (-x -e -t -r -b)\n",
309 "Only output 'bad' things", 1055 "Only output 'bad' things",
310 "Be verbose (can be specified more than once)", 1056 "Be verbose (can be specified more than once)",
1057 "Use specified format for output",
1058 "Read input stream from a filename",
1059 "Write output stream to a filename",
311 "Don't display the header", 1060 "Don't display the header",
312 "Print this help and exit", 1061 "Print this help and exit",
313 "Print version and exit", 1062 "Print version and exit",
314 NULL 1063 NULL
315}; 1064};
316 1065
317/* display usage and exit */ 1066/* display usage and exit */
318static void usage(int status) 1067static void usage(int status)
319{ 1068{
320 int i; 1069 unsigned long i;
321 printf(" Scan ELF binaries for stuff\n\n" 1070 printf("* Scan ELF binaries for stuff\n\n"
322 "Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0); 1071 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
323 fputs("Options:\n", stdout); 1072 printf("Options: -[%s]\n", PARSE_FLAGS);
324 for (i = 0; long_opts[i].name; ++i) 1073 for (i = 0; long_opts[i].name; ++i)
1074 if (long_opts[i].has_arg == no_argument)
325 printf(" -%c, --%-12s %s\n", long_opts[i].val, 1075 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
326 long_opts[i].name, opts_help[i]); 1076 long_opts[i].name, opts_help[i]);
1077 else
1078 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1079 long_opts[i].name, opts_help[i]);
1080
1081 if (status != EXIT_SUCCESS)
1082 exit(status);
1083
1084 puts("\nThe format modifiers for the -F option are:");
1085 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1086 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1087 puts(" i INTERP \tb BIND \ts symbol");
1088 puts(" N library \to Type \tT TEXTRELs");
1089 puts(" S SONAME");
1090 puts(" p filename (with search path removed)");
1091 puts(" f filename (short name/basename)");
1092 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1093
327 exit(status); 1094 exit(status);
328} 1095}
329 1096
330/* parse command line arguments and preform needed actions */ 1097/* parse command line arguments and preform needed actions */
331static void parseargs(int argc, char *argv[]) 1098static void parseargs(int argc, char *argv[])
332{ 1099{
333 int flag; 1100 int i;
1101 char *from_file = NULL;
334 1102
335 opterr = 0; 1103 opterr = 0;
336 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 1104 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
337 switch (flag) { 1105 switch (i) {
338 1106
339 case 'V': /* version info */ 1107 case 'V':
340 printf("%s compiled %s\n" 1108 printf("pax-utils-%s: %s compiled %s\n%s\n"
341 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n" 1109 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
342 "%s\n",
343 __FILE__, __DATE__, argv0, rcsid); 1110 VERSION, __FILE__, __DATE__, rcsid, argv0);
344 exit(EXIT_SUCCESS); 1111 exit(EXIT_SUCCESS);
345 break; 1112 break;
346 case 'h': usage(EXIT_SUCCESS); break; 1113 case 'h': usage(EXIT_SUCCESS); break;
1114 case 'f':
1115 if (from_file) err("Don't specify -f twice");
1116 from_file = xstrdup(optarg);
1117 break;
1118 case 'o': {
1119 FILE *fp = NULL;
1120 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1121 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1122 SET_STDOUT(fp);
1123 break;
1124 }
347 1125
1126 case 's': {
1127 size_t len;
1128 if (find_sym) err("Don't specify -s twice");
1129 find_sym = xstrdup(optarg);
1130 len = strlen(find_sym) + 1;
1131 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1132 sprintf(versioned_symname, "%s@", find_sym);
1133 break;
1134 }
1135 case 'N': {
1136 if (find_lib) err("Don't specify -N twice");
1137 find_lib = xstrdup(optarg);
1138 break;
1139 }
1140
1141 case 'F': {
1142 if (out_format) err("Don't specify -F twice");
1143 out_format = xstrdup(optarg);
1144 break;
1145 }
1146
1147 case 'g': gmatch = 1;
1148 case 'y': scan_symlink = 0; break;
348 case 'H': show_header = 0; break; 1149 case 'B': show_banner = 0; break;
349 case 'l': scan_ldpath = 1; break; 1150 case 'l': scan_ldpath = 1; break;
350 case 'p': scan_envpath = 1; break; 1151 case 'p': scan_envpath = 1; break;
351 case 'R': dir_recurse = 1; break; 1152 case 'R': dir_recurse = 1; break;
352 case 'm': dir_crossmount = 0; break; 1153 case 'm': dir_crossmount = 0; break;
353 case 'x': show_pax = 1; break; 1154 case 'x': show_pax = 1; break;
354 case 's': show_stack = 1; break; 1155 case 'e': show_phdr = 1; break;
355 case 't': show_textrel = 1; break; 1156 case 't': show_textrel = 1; break;
356 case 'r': show_rpath = 1; break; 1157 case 'r': show_rpath = 1; break;
1158 case 'n': show_needed = 1; break;
1159 case 'i': show_interp = 1; break;
1160 case 'b': show_bind = 1; break;
1161 case 'S': show_soname = 1; break;
1162 case 'T': show_textrels = 1; break;
357 case 'q': be_quiet = 1; break; 1163 case 'q': be_quiet = 1; break;
358 case 'v': be_verbose = (be_verbose % 20) + 1; break; 1164 case 'v': be_verbose = (be_verbose % 20) + 1; break;
359 case 'a': show_pax = show_stack = show_textrel = show_rpath = 1; break; 1165 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
360 1166
361 case ':': 1167 case ':':
362 warn("Option missing parameter"); 1168 err("Option missing parameter\n");
363 usage(EXIT_FAILURE);
364 break;
365 case '?': 1169 case '?':
366 warn("Unknown option"); 1170 err("Unknown option\n");
367 usage(EXIT_FAILURE);
368 break;
369 default: 1171 default:
370 err("Unhandled option '%c'", flag); 1172 err("Unhandled option '%c'", i);
371 break;
372 } 1173 }
373 } 1174 }
374 1175
375 if (be_quiet && be_verbose) 1176 /* let the format option override all other options */
376 err("You can be quiet or you can be verbose, not both, stupid"); 1177 if (out_format) {
1178 show_pax = show_phdr = show_textrel = show_rpath = \
1179 show_needed = show_interp = show_bind = show_soname = \
1180 show_textrels = 0;
1181 for (i = 0; out_format[i]; ++i) {
1182 if (!IS_MODIFIER(out_format[i])) continue;
377 1183
1184 switch (out_format[++i]) {
1185 case '%': break;
1186 case '#': break;
1187 case 'F': break;
1188 case 'p': break;
1189 case 'f': break;
1190 case 's': break;
1191 case 'N': break;
1192 case 'o': break;
1193 case 'x': show_pax = 1; break;
1194 case 'e': show_phdr = 1; break;
1195 case 't': show_textrel = 1; break;
1196 case 'r': show_rpath = 1; break;
1197 case 'n': show_needed = 1; break;
1198 case 'i': show_interp = 1; break;
1199 case 'b': show_bind = 1; break;
1200 case 'S': show_soname = 1; break;
1201 case 'T': show_textrels = 1; break;
1202 default:
1203 err("Invalid format specifier '%c' (byte %i)",
1204 out_format[i], i+1);
1205 }
1206 }
1207
1208 /* construct our default format */
1209 } else {
1210 size_t fmt_len = 30;
1211 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1212 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1213 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1214 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1215 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1216 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1217 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1218 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1219 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1220 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1221 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1222 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1223 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1224 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1225 }
1226 if (be_verbose > 2) printf("Format: %s\n", out_format);
1227
1228 /* now lets actually do the scanning */
1229 if (scan_ldpath || (show_rpath && be_quiet))
1230 load_ld_so_conf();
378 if (scan_ldpath) scanelf_ldpath(); 1231 if (scan_ldpath) scanelf_ldpath();
379 if (scan_envpath) scanelf_envpath(); 1232 if (scan_envpath) scanelf_envpath();
1233 if (from_file) {
1234 scanelf_from_file(from_file);
1235 free(from_file);
1236 from_file = *argv;
1237 }
1238 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1239 err("Nothing to scan !?");
380 while (optind < argc) 1240 while (optind < argc) {
381 scanelf_dir(argv[optind++]); 1241 search_path = argv[optind++];
1242 scanelf_dir(search_path);
1243 }
1244
1245 /* clean up */
1246 if (find_sym) {
1247 free(find_sym);
1248 free(versioned_symname);
1249 }
1250 if (find_lib) free(find_lib);
1251 if (out_format) free(out_format);
1252 for (i = 0; ldpaths[i]; ++i)
1253 free(ldpaths[i]);
1254}
1255
1256
1257
1258/* utility funcs */
1259static char *xstrdup(const char *s)
1260{
1261 char *ret = strdup(s);
1262 if (!ret) err("Could not strdup(): %s", strerror(errno));
1263 return ret;
1264}
1265
1266static void *xmalloc(size_t size)
1267{
1268 void *ret = malloc(size);
1269 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1270 return ret;
1271}
1272
1273static void xstrcat(char **dst, const char *src, size_t *curr_len)
1274{
1275 size_t new_len;
1276
1277 new_len = strlen(*dst) + strlen(src);
1278 if (*curr_len <= new_len) {
1279 *curr_len = new_len + (*curr_len / 2);
1280 *dst = realloc(*dst, *curr_len);
1281 if (!*dst)
1282 err("could not realloc %li bytes", (unsigned long)*curr_len);
1283 }
1284
1285 strcat(*dst, src);
1286}
1287
1288static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1289{
1290 static char my_app[2];
1291 my_app[0] = append;
1292 my_app[1] = '\0';
1293 xstrcat(dst, my_app, curr_len);
382} 1294}
383 1295
384 1296
385 1297
386int main(int argc, char *argv[]) 1298int main(int argc, char *argv[])
387{ 1299{
388 if (argc < 2) 1300 if (argc < 2)
389 usage(EXIT_FAILURE); 1301 usage(EXIT_FAILURE);
390 parseargs(argc, argv); 1302 parseargs(argc, argv);
1303 fclose(stdout);
1304#ifdef __BOUNDS_CHECKING_ON
1305 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1306#endif
391 return EXIT_SUCCESS; 1307 return EXIT_SUCCESS;
392} 1308}

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