/[gentoo-projects]/pax-utils/scanelf.c
Gentoo

Contents of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.138 - (show annotations) (download) (as text)
Fri Mar 31 06:07:47 2006 UTC (8 years, 8 months ago) by vapier
Branch: MAIN
Changes since 1.137: +4 -4 lines
File MIME type: text/x-csrc
touchup style

1 /*
2 * Copyright 2003-2006 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.137 2006/03/19 02:41:17 solar Exp $
5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 #include "paxinc.h"
11 #ifdef __linux__
12 #include <glob.h>
13 #endif
14 static const char *rcsid = "$Id: scanelf.c,v 1.137 2006/03/19 02:41:17 solar Exp $";
15 #define argv0 "scanelf"
16
17 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
18
19 #define do_state(option, flag) \
20 if (islower(option)) { \
21 flags &= ~PF_##flag; \
22 flags |= PF_NO##flag; \
23 } else { \
24 flags &= ~PF_NO##flag; \
25 flags |= PF_##flag; \
26 }
27
28
29 /* prototypes */
30 static int scanelf_elfobj(elfobj *elf);
31 static int scanelf_elf(const char *filename, int fd, size_t len);
32 static int scanelf_archive(const char *filename, int fd, size_t len);
33 static void scanelf_file(const char *filename);
34 static void scanelf_dir(const char *path);
35 static void scanelf_ldpath(void);
36 static void scanelf_envpath(void);
37 static void usage(int status);
38 static void parseargs(int argc, char *argv[]);
39 static char *xstrdup(const char *s);
40 static void *xmalloc(size_t size);
41 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
42 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
43 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
44
45 /* variables to control behavior */
46 static char match_etypes[126] = "";
47 static char *ldpaths[256];
48 static char scan_ldpath = 0;
49 static char scan_envpath = 0;
50 static char scan_symlink = 1;
51 static char scan_archives = 0;
52 static char dir_recurse = 0;
53 static char dir_crossmount = 1;
54 static char show_pax = 0;
55 static char show_phdr = 0;
56 static char show_textrel = 0;
57 static char show_rpath = 0;
58 static char show_needed = 0;
59 static char show_interp = 0;
60 static char show_bind = 0;
61 static char show_soname = 0;
62 static char show_textrels = 0;
63 static char show_banner = 1;
64 static char be_quiet = 0;
65 static char be_verbose = 0;
66 static char be_wewy_wewy_quiet = 0;
67 static char be_semi_verbose = 0;
68 static char *find_sym = NULL, *versioned_symname = NULL;
69 static char *find_lib = NULL;
70 static char *find_section = NULL;
71 static char *out_format = NULL;
72 static char *search_path = NULL;
73 static char fix_elf = 0;
74 static char gmatch = 0;
75 static char use_ldcache = 0;
76
77 int match_bits = 0;
78 caddr_t ldcache = 0;
79 size_t ldcache_size = 0;
80 unsigned long setpax = 0UL;
81
82 /* sub-funcs for scanelf_file() */
83 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
84 {
85 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
86 #define GET_SYMTABS(B) \
87 if (elf->elf_class == ELFCLASS ## B) { \
88 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
89 /* debug sections */ \
90 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
91 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
92 /* runtime sections */ \
93 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
94 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
95 if (symtab && dynsym) { \
96 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
97 } else { \
98 *sym = (void*)(symtab ? symtab : dynsym); \
99 } \
100 if (strtab && dynstr) { \
101 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
102 } else { \
103 *tab = (void*)(strtab ? strtab : dynstr); \
104 } \
105 }
106 GET_SYMTABS(32)
107 GET_SYMTABS(64)
108 }
109
110 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
111 {
112 static char ret[7];
113 unsigned long i, shown;
114
115 if (!show_pax) return NULL;
116
117 shown = 0;
118 memset(&ret, 0, sizeof(ret));
119
120 if (elf->phdr) {
121 #define SHOW_PAX(B) \
122 if (elf->elf_class == ELFCLASS ## B) { \
123 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
124 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
125 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
126 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
127 continue; \
128 if (fix_elf && setpax) { \
129 /* set the paxctl flags */ \
130 ESET(phdr[i].p_flags, setpax); \
131 } \
132 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
133 continue; \
134 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
135 *found_pax = 1; \
136 ++shown; \
137 break; \
138 } \
139 }
140 SHOW_PAX(32)
141 SHOW_PAX(64)
142 }
143
144
145 if (fix_elf && setpax) {
146 /* set the chpax settings */
147 if (elf->elf_class == ELFCLASS32) {
148 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
149 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
150 } else {
151 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
152 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
153 }
154 }
155
156 /* fall back to EI_PAX if no PT_PAX was found */
157 if (!*ret) {
158 static char *paxflags;
159 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
160 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
161 *found_pax = 1;
162 return (be_wewy_wewy_quiet ? NULL : paxflags);
163 }
164 strncpy(ret, paxflags, sizeof(ret));
165 }
166
167 if (be_wewy_wewy_quiet || (be_quiet && !shown))
168 return NULL;
169 else
170 return ret;
171 }
172
173 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
174 {
175 static char ret[12];
176 char *found;
177 unsigned long i, shown, multi_stack, multi_relro, multi_load;
178 int max_pt_load;
179
180 if (!show_phdr) return NULL;
181
182 memcpy(ret, "--- --- ---\0", 12);
183
184 shown = 0;
185 multi_stack = multi_relro = multi_load = 0;
186 max_pt_load = elf_max_pt_load(elf);
187
188 #define NOTE_GNU_STACK ".note.GNU-stack"
189 #define SHOW_PHDR(B) \
190 if (elf->elf_class == ELFCLASS ## B) { \
191 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
192 Elf ## B ## _Off offset; \
193 uint32_t flags, check_flags; \
194 if (elf->phdr != NULL) { \
195 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
196 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
197 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
198 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
199 found = found_phdr; \
200 offset = 0; \
201 check_flags = PF_X; \
202 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
203 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
204 found = found_relro; \
205 offset = 4; \
206 check_flags = PF_X; \
207 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
208 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
209 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
210 found = found_load; \
211 offset = 8; \
212 check_flags = PF_W|PF_X; \
213 } else \
214 continue; \
215 flags = EGET(phdr[i].p_flags); \
216 if (be_quiet && ((flags & check_flags) != check_flags)) \
217 continue; \
218 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
219 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
220 ret[3] = ret[7] = '!'; \
221 flags = EGET(phdr[i].p_flags); \
222 } \
223 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
224 *found = 1; \
225 ++shown; \
226 } \
227 } else if (elf->shdr != NULL) { \
228 /* no program headers which means this is prob an object file */ \
229 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
230 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
231 char *str; \
232 if ((void*)strtbl > (void*)elf->data_end) \
233 goto skip_this_shdr##B; \
234 check_flags = SHF_WRITE|SHF_EXECINSTR; \
235 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
236 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
237 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
238 str = elf->data + offset; \
239 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
240 if (!strcmp(str, NOTE_GNU_STACK)) { \
241 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
242 flags = EGET(shdr[i].sh_flags); \
243 if (be_quiet && ((flags & check_flags) != check_flags)) \
244 continue; \
245 ++*found_phdr; \
246 shown = 1; \
247 if (flags & SHF_WRITE) ret[0] = 'W'; \
248 if (flags & SHF_ALLOC) ret[1] = 'A'; \
249 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
250 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
251 break; \
252 } \
253 } \
254 skip_this_shdr##B: \
255 if (!multi_stack) { \
256 *found_phdr = 1; \
257 shown = 1; \
258 memcpy(ret, "!WX", 3); \
259 } \
260 } \
261 }
262 SHOW_PHDR(32)
263 SHOW_PHDR(64)
264
265 if (be_wewy_wewy_quiet || (be_quiet && !shown))
266 return NULL;
267 else
268 return ret;
269 }
270 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
271 {
272 static const char *ret = "TEXTREL";
273 unsigned long i;
274
275 if (!show_textrel && !show_textrels) return NULL;
276
277 if (elf->phdr) {
278 #define SHOW_TEXTREL(B) \
279 if (elf->elf_class == ELFCLASS ## B) { \
280 Elf ## B ## _Dyn *dyn; \
281 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
282 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
283 Elf ## B ## _Off offset; \
284 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
285 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
286 offset = EGET(phdr[i].p_offset); \
287 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
288 dyn = DYN ## B (elf->data + offset); \
289 while (EGET(dyn->d_tag) != DT_NULL) { \
290 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
291 *found_textrel = 1; \
292 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
293 return (be_wewy_wewy_quiet ? NULL : ret); \
294 } \
295 ++dyn; \
296 } \
297 } }
298 SHOW_TEXTREL(32)
299 SHOW_TEXTREL(64)
300 }
301
302 if (be_quiet || be_wewy_wewy_quiet)
303 return NULL;
304 else
305 return " - ";
306 }
307 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
308 {
309 unsigned long s, r, rmax;
310 void *symtab_void, *strtab_void, *text_void;
311
312 if (!show_textrels) return NULL;
313
314 /* don't search for TEXTREL's if the ELF doesn't have any */
315 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
316 if (!*found_textrel) return NULL;
317
318 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
319 text_void = elf_findsecbyname(elf, ".text");
320
321 if (symtab_void && strtab_void && text_void && elf->shdr) {
322 #define SHOW_TEXTRELS(B) \
323 if (elf->elf_class == ELFCLASS ## B) { \
324 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
325 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
326 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
327 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
328 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
329 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
330 uint ## B ## _t memsz = EGET(text->sh_size); \
331 Elf ## B ## _Rel *rel; \
332 Elf ## B ## _Rela *rela; \
333 /* search the section headers for relocations */ \
334 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
335 uint32_t sh_type = EGET(shdr[s].sh_type); \
336 if (sh_type == SHT_REL) { \
337 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
338 rela = NULL; \
339 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
340 } else if (sh_type == SHT_RELA) { \
341 rel = NULL; \
342 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
343 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
344 } else \
345 continue; \
346 /* now see if any of the relocs are in the .text */ \
347 for (r = 0; r < rmax; ++r) { \
348 unsigned long sym_max; \
349 Elf ## B ## _Addr offset_tmp; \
350 Elf ## B ## _Sym *func; \
351 Elf ## B ## _Sym *sym; \
352 Elf ## B ## _Addr r_offset; \
353 uint ## B ## _t r_info; \
354 if (sh_type == SHT_REL) { \
355 r_offset = EGET(rel[r].r_offset); \
356 r_info = EGET(rel[r].r_info); \
357 } else { \
358 r_offset = EGET(rela[r].r_offset); \
359 r_info = EGET(rela[r].r_info); \
360 } \
361 /* make sure this relocation is inside of the .text */ \
362 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
363 if (be_verbose <= 2) continue; \
364 } else \
365 *found_textrels = 1; \
366 /* locate this relocation symbol name */ \
367 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
368 if ((void*)sym > (void*)elf->data_end) { \
369 warn("%s: corrupt ELF symbol", elf->filename); \
370 continue; \
371 } \
372 sym_max = ELF ## B ## _R_SYM(r_info); \
373 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
374 sym += sym_max; \
375 else \
376 sym = NULL; \
377 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
378 /* show the raw details about this reloc */ \
379 printf(" %s: ", elf->base_filename); \
380 if (sym && sym->st_name) \
381 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
382 else \
383 printf("(memory/fake?)"); \
384 printf(" [0x%lX]", (unsigned long)r_offset); \
385 /* now try to find the closest symbol that this rel is probably in */ \
386 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
387 func = NULL; \
388 offset_tmp = 0; \
389 while (sym_max--) { \
390 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
391 func = sym; \
392 offset_tmp = EGET(sym->st_value); \
393 } \
394 ++sym; \
395 } \
396 printf(" in "); \
397 if (func && func->st_name) \
398 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
399 else \
400 printf("(NULL: fake?)"); \
401 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
402 } \
403 } }
404 SHOW_TEXTRELS(32)
405 SHOW_TEXTRELS(64)
406 }
407 if (!*found_textrels)
408 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
409
410 return NULL;
411 }
412
413 static void rpath_security_checks(elfobj *, char *, const char *);
414 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
415 {
416 struct stat st;
417 switch (*item) {
418 case '/': break;
419 case '.':
420 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
421 break;
422 case ':':
423 case '\0':
424 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
425 break;
426 case '$':
427 if (fstat(elf->fd, &st) != -1)
428 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
429 warnf("Security problem with %s='%s' in %s with mode set of %o",
430 dt_type, item, elf->filename, st.st_mode & 07777);
431 break;
432 default:
433 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
434 break;
435 }
436 }
437 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
438 {
439 unsigned long i, s;
440 char *rpath, *runpath, **r;
441 void *strtbl_void;
442
443 if (!show_rpath) return;
444
445 strtbl_void = elf_findsecbyname(elf, ".dynstr");
446 rpath = runpath = NULL;
447
448 if (elf->phdr && strtbl_void) {
449 #define SHOW_RPATH(B) \
450 if (elf->elf_class == ELFCLASS ## B) { \
451 Elf ## B ## _Dyn *dyn; \
452 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
453 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
454 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
455 Elf ## B ## _Off offset; \
456 Elf ## B ## _Xword word; \
457 /* Scan all the program headers */ \
458 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
459 /* Just scan dynamic headers */ \
460 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
461 offset = EGET(phdr[i].p_offset); \
462 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
463 /* Just scan dynamic RPATH/RUNPATH headers */ \
464 dyn = DYN ## B (elf->data + offset); \
465 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
466 if (word == DT_RPATH) { \
467 r = &rpath; \
468 } else if (word == DT_RUNPATH) { \
469 r = &runpath; \
470 } else { \
471 ++dyn; \
472 continue; \
473 } \
474 /* Verify the memory is somewhat sane */ \
475 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
476 if (offset < (Elf ## B ## _Off)elf->len) { \
477 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
478 *r = (char*)(elf->data + offset); \
479 /* cache the length in case we need to nuke this section later on */ \
480 if (fix_elf) \
481 offset = strlen(*r); \
482 /* If quiet, don't output paths in ld.so.conf */ \
483 if (be_quiet) { \
484 size_t len; \
485 char *start, *end; \
486 /* note that we only 'chop' off leading known paths. */ \
487 /* since *r is read-only memory, we can only move the ptr forward. */ \
488 start = *r; \
489 /* scan each path in : delimited list */ \
490 while (start) { \
491 rpath_security_checks(elf, start, get_elfdtype(word)); \
492 end = strchr(start, ':'); \
493 len = (end ? abs(end - start) : strlen(start)); \
494 if (use_ldcache) \
495 for (s = 0; ldpaths[s]; ++s) \
496 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
497 *r = end; \
498 /* corner case ... if RPATH reads "/usr/lib:", we want \
499 * to show ':' rather than '' */ \
500 if (end && end[1] != '\0') \
501 (*r)++; \
502 break; \
503 } \
504 if (!*r || !end) \
505 break; \
506 else \
507 start = start + len + 1; \
508 } \
509 } \
510 if (*r) { \
511 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
512 /* just nuke it */ \
513 nuke_it##B: \
514 memset(*r, 0x00, offset); \
515 *r = NULL; \
516 ESET(dyn->d_tag, DT_DEBUG); \
517 ESET(dyn->d_un.d_ptr, 0); \
518 } else if (fix_elf) { \
519 /* try to clean "bad" paths */ \
520 size_t len, tmpdir_len; \
521 char *start, *end; \
522 const char *tmpdir; \
523 start = *r; \
524 tmpdir = (getenv("TMPDIR") ? : "."); \
525 tmpdir_len = strlen(tmpdir); \
526 while (1) { \
527 end = strchr(start, ':'); \
528 if (start == end) { \
529 eat_this_path##B: \
530 len = strlen(end); \
531 memmove(start, end+1, len); \
532 start[len-1] = '\0'; \
533 end = start - 1; \
534 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
535 if (!end) { \
536 if (start == *r) \
537 goto nuke_it##B; \
538 *--start = '\0'; \
539 } else \
540 goto eat_this_path##B; \
541 } \
542 if (!end) \
543 break; \
544 start = end + 1; \
545 } \
546 if (**r == '\0') \
547 goto nuke_it##B; \
548 } \
549 if (*r) \
550 *found_rpath = 1; \
551 } \
552 } \
553 ++dyn; \
554 } \
555 } }
556 SHOW_RPATH(32)
557 SHOW_RPATH(64)
558 }
559
560 if (be_wewy_wewy_quiet) return;
561
562 if (rpath && runpath) {
563 if (!strcmp(rpath, runpath)) {
564 xstrcat(ret, runpath, ret_len);
565 } else {
566 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
567 xchrcat(ret, '{', ret_len);
568 xstrcat(ret, rpath, ret_len);
569 xchrcat(ret, ',', ret_len);
570 xstrcat(ret, runpath, ret_len);
571 xchrcat(ret, '}', ret_len);
572 }
573 } else if (rpath || runpath)
574 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
575 else if (!be_quiet)
576 xstrcat(ret, " - ", ret_len);
577 }
578
579 #define LDSO_CACHE_MAGIC "ld.so-"
580 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
581 #define LDSO_CACHE_VER "1.7.0"
582 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
583 #define FLAG_ANY -1
584 #define FLAG_TYPE_MASK 0x00ff
585 #define FLAG_LIBC4 0x0000
586 #define FLAG_ELF 0x0001
587 #define FLAG_ELF_LIBC5 0x0002
588 #define FLAG_ELF_LIBC6 0x0003
589 #define FLAG_REQUIRED_MASK 0xff00
590 #define FLAG_SPARC_LIB64 0x0100
591 #define FLAG_IA64_LIB64 0x0200
592 #define FLAG_X8664_LIB64 0x0300
593 #define FLAG_S390_LIB64 0x0400
594 #define FLAG_POWERPC_LIB64 0x0500
595 #define FLAG_MIPS64_LIBN32 0x0600
596 #define FLAG_MIPS64_LIBN64 0x0700
597
598 static char *lookup_cache_lib(elfobj *, char *);
599 static char *lookup_cache_lib(elfobj *elf, char *fname)
600 {
601 int fd = 0;
602 char *strs;
603 static char buf[__PAX_UTILS_PATH_MAX] = "";
604 const char *cachefile = "/etc/ld.so.cache";
605 struct stat st;
606
607 typedef struct {
608 char magic[LDSO_CACHE_MAGIC_LEN];
609 char version[LDSO_CACHE_VER_LEN];
610 int nlibs;
611 } header_t;
612 header_t *header;
613
614 typedef struct {
615 int flags;
616 int sooffset;
617 int liboffset;
618 } libentry_t;
619 libentry_t *libent;
620
621 if (fname == NULL)
622 return NULL;
623
624 if (ldcache == 0) {
625 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
626 return NULL;
627
628 /* cache these values so we only map/unmap the cache file once */
629 ldcache_size = st.st_size;
630 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
631
632 close(fd);
633
634 if (ldcache == (caddr_t)-1) {
635 ldcache = 0;
636 return NULL;
637 }
638
639 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
640 return NULL;
641 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
642 return NULL;
643 }
644
645 header = (header_t *) ldcache;
646 libent = (libentry_t *) (ldcache + sizeof(header_t));
647 strs = (char *) &libent[header->nlibs];
648
649 for (fd = 0; fd < header->nlibs; fd++) {
650 /* this should be more fine grained, but for now we assume that
651 * diff arches will not be cached together. and we ignore the
652 * the different multilib mips cases. */
653 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
654 continue;
655 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
656 continue;
657
658 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
659 continue;
660 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
661 }
662 return buf;
663 }
664
665
666 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
667 {
668 unsigned long i;
669 char *needed;
670 void *strtbl_void;
671 char *p;
672
673 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
674
675 strtbl_void = elf_findsecbyname(elf, ".dynstr");
676
677 if (elf->phdr && strtbl_void) {
678 #define SHOW_NEEDED(B) \
679 if (elf->elf_class == ELFCLASS ## B) { \
680 Elf ## B ## _Dyn *dyn; \
681 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
682 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
683 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
684 Elf ## B ## _Off offset; \
685 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
686 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
687 offset = EGET(phdr[i].p_offset); \
688 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
689 dyn = DYN ## B (elf->data + offset); \
690 while (EGET(dyn->d_tag) != DT_NULL) { \
691 if (EGET(dyn->d_tag) == DT_NEEDED) { \
692 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
693 if (offset >= (Elf ## B ## _Off)elf->len) { \
694 ++dyn; \
695 continue; \
696 } \
697 needed = (char*)(elf->data + offset); \
698 if (op == 0) { \
699 if (!be_wewy_wewy_quiet) { \
700 if (*found_needed) xchrcat(ret, ',', ret_len); \
701 if (use_ldcache) \
702 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
703 needed = p; \
704 xstrcat(ret, needed, ret_len); \
705 } \
706 *found_needed = 1; \
707 } else { \
708 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
709 *found_lib = 1; \
710 return (be_wewy_wewy_quiet ? NULL : needed); \
711 } \
712 } \
713 } \
714 ++dyn; \
715 } \
716 } }
717 SHOW_NEEDED(32)
718 SHOW_NEEDED(64)
719 if (op == 0 && !*found_needed && be_verbose)
720 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
721 }
722
723 return NULL;
724 }
725 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
726 {
727 void *strtbl_void;
728
729 if (!show_interp) return NULL;
730
731 strtbl_void = elf_findsecbyname(elf, ".interp");
732
733 if (strtbl_void) {
734 #define SHOW_INTERP(B) \
735 if (elf->elf_class == ELFCLASS ## B) { \
736 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
737 *found_interp = 1; \
738 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
739 }
740 SHOW_INTERP(32)
741 SHOW_INTERP(64)
742 }
743 return NULL;
744 }
745 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
746 {
747 unsigned long i;
748 struct stat s;
749 char dynamic = 0;
750
751 if (!show_bind) return NULL;
752 if (!elf->phdr) return NULL;
753
754 #define SHOW_BIND(B) \
755 if (elf->elf_class == ELFCLASS ## B) { \
756 Elf ## B ## _Dyn *dyn; \
757 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
758 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
759 Elf ## B ## _Off offset; \
760 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
761 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
762 dynamic = 1; \
763 offset = EGET(phdr[i].p_offset); \
764 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
765 dyn = DYN ## B (elf->data + offset); \
766 while (EGET(dyn->d_tag) != DT_NULL) { \
767 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
768 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
769 { \
770 if (be_quiet) return NULL; \
771 *found_bind = 1; \
772 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
773 } \
774 ++dyn; \
775 } \
776 } \
777 }
778 SHOW_BIND(32)
779 SHOW_BIND(64)
780
781 if (be_wewy_wewy_quiet) return NULL;
782
783 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
784 return NULL;
785 } else {
786 *found_bind = 1;
787 return (char *) (dynamic ? "LAZY" : "STATIC");
788 }
789 }
790 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
791 {
792 unsigned long i;
793 char *soname;
794 void *strtbl_void;
795
796 if (!show_soname) return NULL;
797
798 strtbl_void = elf_findsecbyname(elf, ".dynstr");
799
800 if (elf->phdr && strtbl_void) {
801 #define SHOW_SONAME(B) \
802 if (elf->elf_class == ELFCLASS ## B) { \
803 Elf ## B ## _Dyn *dyn; \
804 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
805 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
806 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
807 Elf ## B ## _Off offset; \
808 /* only look for soname in shared objects */ \
809 if (ehdr->e_type != ET_DYN) \
810 return NULL; \
811 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
812 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
813 offset = EGET(phdr[i].p_offset); \
814 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
815 dyn = DYN ## B (elf->data + offset); \
816 while (EGET(dyn->d_tag) != DT_NULL) { \
817 if (EGET(dyn->d_tag) == DT_SONAME) { \
818 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
819 if (offset >= (Elf ## B ## _Off)elf->len) { \
820 ++dyn; \
821 continue; \
822 } \
823 soname = (char*)(elf->data + offset); \
824 *found_soname = 1; \
825 return (be_wewy_wewy_quiet ? NULL : soname); \
826 } \
827 ++dyn; \
828 } \
829 } }
830 SHOW_SONAME(32)
831 SHOW_SONAME(64)
832 }
833
834 return NULL;
835 }
836 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
837 {
838 unsigned long i;
839 char *ret;
840 void *symtab_void, *strtab_void;
841
842 if (!find_sym) return NULL;
843 ret = find_sym;
844
845 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
846
847 if (symtab_void && strtab_void) {
848 #define FIND_SYM(B) \
849 if (elf->elf_class == ELFCLASS ## B) { \
850 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
851 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
852 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
853 unsigned long cnt = EGET(symtab->sh_entsize); \
854 char *symname; \
855 if (cnt) \
856 cnt = EGET(symtab->sh_size) / cnt; \
857 for (i = 0; i < cnt; ++i) { \
858 if (sym->st_name) { \
859 /* make sure the symbol name is in acceptable memory range */ \
860 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
861 if ((void*)symname > (void*)elf->data_end) { \
862 warnf("%s: corrupt ELF symbols", elf->filename); \
863 ++sym; \
864 continue; \
865 } \
866 /* debug display ... show all symbols and some extra info */ \
867 if (*ret == '*') { \
868 printf("%s(%s) %5lX %15s %s\n", \
869 ((*found_sym == 0) ? "\n\t" : "\t"), \
870 elf->base_filename, \
871 (unsigned long)sym->st_size, \
872 get_elfstttype(sym->st_info), \
873 symname); \
874 *found_sym = 1; \
875 } else { \
876 /* allow the user to specify a comma delimited list of symbols to search for */ \
877 char *this_sym, *next_sym; \
878 this_sym = ret; \
879 do { \
880 next_sym = strchr(this_sym, ','); \
881 if (next_sym == NULL) \
882 next_sym = this_sym + strlen(this_sym); \
883 /* do we want a defined symbol ? */ \
884 if (*this_sym == '+') { \
885 if (sym->st_value == 0) \
886 goto skip_this_sym##B; \
887 ++this_sym; \
888 /* do we want an undefined symbol ? */ \
889 } else if (*this_sym == '-') { \
890 if (sym->st_value != 0) \
891 goto skip_this_sym##B; \
892 ++this_sym; \
893 } \
894 /* ok, lets compare the name now */ \
895 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
896 (strcmp(symname, versioned_symname) == 0)) { \
897 if (be_semi_verbose) { \
898 char buf[126]; \
899 snprintf(buf, sizeof(buf), "%lX %s %s", \
900 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
901 ret = buf; \
902 } else \
903 ret = this_sym; \
904 (*found_sym)++; \
905 goto break_out; \
906 } \
907 skip_this_sym##B: this_sym = next_sym + 1; \
908 } while (*next_sym != '\0'); \
909 } \
910 } \
911 ++sym; \
912 } }
913 FIND_SYM(32)
914 FIND_SYM(64)
915 }
916
917 break_out:
918 if (be_wewy_wewy_quiet) return NULL;
919
920 if (*find_sym != '*' && *found_sym)
921 return ret;
922 if (be_quiet)
923 return NULL;
924 else
925 return (char *)" - ";
926 }
927
928
929 static char *scanelf_file_sections(elfobj *elf, char *found_section)
930 {
931 if (!find_section)
932 return NULL;
933
934 #define FIND_SECTION(B) \
935 if (elf->elf_class == ELFCLASS ## B) { \
936 int invert; \
937 Elf ## B ## _Shdr *section; \
938 invert = (*find_section == '!' ? 1 : 0); \
939 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
940 if ((section == NULL && invert) || (section != NULL && !invert)) \
941 *found_section = 1; \
942 }
943 FIND_SECTION(32)
944 FIND_SECTION(64)
945
946 if (be_wewy_wewy_quiet)
947 return NULL;
948
949 if (*found_section)
950 return find_section;
951
952 if (be_quiet)
953 return NULL;
954 else
955 return (char *)" - ";
956 }
957
958 /* scan an elf file and show all the fun stuff */
959 #define prints(str) write(fileno(stdout), str, strlen(str))
960 static int scanelf_elfobj(elfobj *elf)
961 {
962 unsigned long i;
963 char found_pax, found_phdr, found_relro, found_load, found_textrel,
964 found_rpath, found_needed, found_interp, found_bind, found_soname,
965 found_sym, found_lib, found_file, found_textrels, found_section;
966 static char *out_buffer = NULL;
967 static size_t out_len;
968
969 found_pax = found_phdr = found_relro = found_load = found_textrel = \
970 found_rpath = found_needed = found_interp = found_bind = found_soname = \
971 found_sym = found_lib = found_file = found_textrels = found_section = 0;
972
973 if (be_verbose > 2)
974 printf("%s: scanning file {%s,%s}\n", elf->filename,
975 get_elfeitype(EI_CLASS, elf->elf_class),
976 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
977 else if (be_verbose > 1)
978 printf("%s: scanning file\n", elf->filename);
979
980 /* init output buffer */
981 if (!out_buffer) {
982 out_len = sizeof(char) * 80;
983 out_buffer = (char*)xmalloc(out_len);
984 }
985 *out_buffer = '\0';
986
987 /* show the header */
988 if (!be_quiet && show_banner) {
989 for (i = 0; out_format[i]; ++i) {
990 if (!IS_MODIFIER(out_format[i])) continue;
991
992 switch (out_format[++i]) {
993 case '+': break;
994 case '%': break;
995 case '#': break;
996 case 'F':
997 case 'p':
998 case 'f': prints("FILE "); found_file = 1; break;
999 case 'o': prints(" TYPE "); break;
1000 case 'x': prints(" PAX "); break;
1001 case 'e': prints("STK/REL/PTL "); break;
1002 case 't': prints("TEXTREL "); break;
1003 case 'r': prints("RPATH "); break;
1004 case 'n': prints("NEEDED "); break;
1005 case 'i': prints("INTERP "); break;
1006 case 'b': prints("BIND "); break;
1007 case 'S': prints("SONAME "); break;
1008 case 's': prints("SYM "); break;
1009 case 'N': prints("LIB "); break;
1010 case 'T': prints("TEXTRELS "); break;
1011 case 'k': prints("SECTION "); break;
1012 default: warnf("'%c' has no title ?", out_format[i]);
1013 }
1014 }
1015 if (!found_file) prints("FILE ");
1016 prints("\n");
1017 found_file = 0;
1018 show_banner = 0;
1019 }
1020
1021 /* dump all the good stuff */
1022 for (i = 0; out_format[i]; ++i) {
1023 const char *out;
1024 const char *tmp;
1025
1026 if (!IS_MODIFIER(out_format[i])) {
1027 xchrcat(&out_buffer, out_format[i], &out_len);
1028 continue;
1029 }
1030
1031 out = NULL;
1032 be_wewy_wewy_quiet = (out_format[i] == '#');
1033 be_semi_verbose = (out_format[i] == '+');
1034 switch (out_format[++i]) {
1035 case '+':
1036 case '%':
1037 case '#':
1038 xchrcat(&out_buffer, out_format[i], &out_len); break;
1039 case 'F':
1040 found_file = 1;
1041 if (be_wewy_wewy_quiet) break;
1042 xstrcat(&out_buffer, elf->filename, &out_len);
1043 break;
1044 case 'p':
1045 found_file = 1;
1046 if (be_wewy_wewy_quiet) break;
1047 tmp = elf->filename;
1048 if (search_path) {
1049 ssize_t len_search = strlen(search_path);
1050 ssize_t len_file = strlen(elf->filename);
1051 if (!strncmp(elf->filename, search_path, len_search) && \
1052 len_file > len_search)
1053 tmp += len_search;
1054 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1055 }
1056 xstrcat(&out_buffer, tmp, &out_len);
1057 break;
1058 case 'f':
1059 found_file = 1;
1060 if (be_wewy_wewy_quiet) break;
1061 tmp = strrchr(elf->filename, '/');
1062 tmp = (tmp == NULL ? elf->filename : tmp+1);
1063 xstrcat(&out_buffer, tmp, &out_len);
1064 break;
1065 case 'o': out = get_elfetype(elf); break;
1066 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1067 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1068 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1069 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1070 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1071 case 'n':
1072 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1073 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1074 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1075 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1076 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1077 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1078 default: warnf("'%c' has no scan code?", out_format[i]);
1079 }
1080 if (out) {
1081 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1082 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1083 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1084 else
1085 xstrcat(&out_buffer, out, &out_len);
1086 }
1087 }
1088
1089 #define FOUND_SOMETHING() \
1090 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1091 found_rpath || found_needed || found_interp || found_bind || \
1092 found_soname || found_sym || found_lib || found_textrels || found_section )
1093
1094 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1095 xchrcat(&out_buffer, ' ', &out_len);
1096 xstrcat(&out_buffer, elf->filename, &out_len);
1097 }
1098 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1099 puts(out_buffer);
1100 fflush(stdout);
1101 }
1102
1103 return 0;
1104 }
1105
1106 /* scan a single elf */
1107 static int scanelf_elf(const char *filename, int fd, size_t len)
1108 {
1109 int ret = 1;
1110 elfobj *elf;
1111
1112 /* verify this is real ELF */
1113 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1114 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1115 return ret;
1116 }
1117 switch (match_bits) {
1118 case 32:
1119 if (elf->elf_class != ELFCLASS32)
1120 goto label_done;
1121 break;
1122 case 64:
1123 if (elf->elf_class != ELFCLASS64)
1124 goto label_done;
1125 break;
1126 default: break;
1127 }
1128 if (strlen(match_etypes)) {
1129 char sbuf[126];
1130 strncpy(sbuf, match_etypes, sizeof(sbuf));
1131 if (strchr(match_etypes, ',') != NULL) {
1132 char *p;
1133 while((p = strrchr(sbuf, ',')) != NULL) {
1134 *p = 0;
1135 if (etype_lookup(p+1) == get_etype(elf))
1136 goto label_ret;
1137 }
1138 }
1139 if (etype_lookup(sbuf) != get_etype(elf))
1140 goto label_done;
1141 }
1142
1143 label_ret:
1144 ret = scanelf_elfobj(elf);
1145
1146 label_done:
1147 unreadelf(elf);
1148 return ret;
1149 }
1150
1151 /* scan an archive of elfs */
1152 static int scanelf_archive(const char *filename, int fd, size_t len)
1153 {
1154 archive_handle *ar;
1155 archive_member *m;
1156 char *ar_buffer;
1157 elfobj *elf;
1158
1159 ar = ar_open_fd(filename, fd);
1160 if (ar == NULL)
1161 return 1;
1162
1163 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1164 while ((m=ar_next(ar)) != NULL) {
1165 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1166 if (elf) {
1167 scanelf_elfobj(elf);
1168 unreadelf(elf);
1169 }
1170 }
1171 munmap(ar_buffer, len);
1172
1173 return 0;
1174 }
1175 /* scan a file which may be an elf or an archive or some other magical beast */
1176 static void scanelf_file(const char *filename)
1177 {
1178 struct stat st;
1179 int fd;
1180
1181 /* make sure 'filename' exists */
1182 if (lstat(filename, &st) == -1) {
1183 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1184 return;
1185 }
1186
1187 /* always handle regular files and handle symlinked files if no -y */
1188 if (S_ISLNK(st.st_mode)) {
1189 if (!scan_symlink) return;
1190 stat(filename, &st);
1191 }
1192 if (!S_ISREG(st.st_mode)) {
1193 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1194 return;
1195 }
1196
1197 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1198 return;
1199
1200 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1201 /* if it isn't an ELF, maybe it's an .a archive */
1202 scanelf_archive(filename, fd, st.st_size);
1203
1204 close(fd);
1205 }
1206
1207 /* scan a directory for ET_EXEC files and print when we find one */
1208 static void scanelf_dir(const char *path)
1209 {
1210 register DIR *dir;
1211 register struct dirent *dentry;
1212 struct stat st_top, st;
1213 char buf[__PAX_UTILS_PATH_MAX];
1214 size_t pathlen = 0, len = 0;
1215
1216 /* make sure path exists */
1217 if (lstat(path, &st_top) == -1) {
1218 if (be_verbose > 2) printf("%s: does not exist\n", path);
1219 return;
1220 }
1221
1222 /* ok, if it isn't a directory, assume we can open it */
1223 if (!S_ISDIR(st_top.st_mode)) {
1224 scanelf_file(path);
1225 return;
1226 }
1227
1228 /* now scan the dir looking for fun stuff */
1229 if ((dir = opendir(path)) == NULL) {
1230 warnf("could not opendir %s: %s", path, strerror(errno));
1231 return;
1232 }
1233 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1234
1235 pathlen = strlen(path);
1236 while ((dentry = readdir(dir))) {
1237 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1238 continue;
1239 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1240 if (len >= sizeof(buf)) {
1241 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1242 (unsigned long)len, (unsigned long)sizeof(buf));
1243 continue;
1244 }
1245 sprintf(buf, "%s/%s", path, dentry->d_name);
1246 if (lstat(buf, &st) != -1) {
1247 if (S_ISREG(st.st_mode))
1248 scanelf_file(buf);
1249 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1250 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1251 scanelf_dir(buf);
1252 }
1253 }
1254 }
1255 closedir(dir);
1256 }
1257
1258 static int scanelf_from_file(const char *filename)
1259 {
1260 FILE *fp = NULL;
1261 char *p;
1262 char path[__PAX_UTILS_PATH_MAX];
1263
1264 if (strcmp(filename, "-") == 0)
1265 fp = stdin;
1266 else if ((fp = fopen(filename, "r")) == NULL)
1267 return 1;
1268
1269 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1270 if ((p = strchr(path, '\n')) != NULL)
1271 *p = 0;
1272 search_path = path;
1273 scanelf_dir(path);
1274 }
1275 if (fp != stdin)
1276 fclose(fp);
1277 return 0;
1278 }
1279
1280 static int load_ld_so_conf(int i, const char *fname)
1281 {
1282 FILE *fp = NULL;
1283 char *p;
1284 char path[__PAX_UTILS_PATH_MAX];
1285
1286 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1287 return i;
1288
1289 if ((fp = fopen(fname, "r")) == NULL)
1290 return i;
1291
1292 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1293 if ((p = strrchr(path, '\r')) != NULL)
1294 *p = 0;
1295 if ((p = strchr(path, '\n')) != NULL)
1296 *p = 0;
1297 #ifdef __linux__
1298 // recursive includes of the same file will make this segfault.
1299 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1300 glob64_t gl;
1301 size_t x;
1302 char gpath[__PAX_UTILS_PATH_MAX];
1303
1304 memset(gpath, 0, sizeof(gpath));
1305
1306 if (path[8] != '/')
1307 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1308 else
1309 strncpy(gpath, &path[8], sizeof(gpath));
1310
1311 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1312 for (x = 0; x < gl.gl_pathc; ++x) {
1313 /* try to avoid direct loops */
1314 if (strcmp(gl.gl_pathv[x], fname) == 0)
1315 continue;
1316 i = load_ld_so_conf(i, gl.gl_pathv[x]);
1317 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1318 globfree64(&gl);
1319 return i;
1320 }
1321 }
1322 globfree64 (&gl);
1323 continue;
1324 } else
1325 abort();
1326 }
1327 #endif
1328 if (*path != '/')
1329 continue;
1330
1331 ldpaths[i++] = xstrdup(path);
1332
1333 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1334 break;
1335 }
1336 ldpaths[i] = NULL;
1337
1338 fclose(fp);
1339 return i;
1340 }
1341
1342 /* scan /etc/ld.so.conf for paths */
1343 static void scanelf_ldpath()
1344 {
1345 char scan_l, scan_ul, scan_ull;
1346 int i = 0;
1347
1348 if (!ldpaths[0])
1349 err("Unable to load any paths from ld.so.conf");
1350
1351 scan_l = scan_ul = scan_ull = 0;
1352
1353 while (ldpaths[i]) {
1354 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1355 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1356 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1357 scanelf_dir(ldpaths[i]);
1358 ++i;
1359 }
1360
1361 if (!scan_l) scanelf_dir("/lib");
1362 if (!scan_ul) scanelf_dir("/usr/lib");
1363 if (!scan_ull) scanelf_dir("/usr/local/lib");
1364 }
1365
1366 /* scan env PATH for paths */
1367 static void scanelf_envpath()
1368 {
1369 char *path, *p;
1370
1371 path = getenv("PATH");
1372 if (!path)
1373 err("PATH is not set in your env !");
1374 path = xstrdup(path);
1375
1376 while ((p = strrchr(path, ':')) != NULL) {
1377 scanelf_dir(p + 1);
1378 *p = 0;
1379 }
1380
1381 free(path);
1382 }
1383
1384 /* usage / invocation handling functions */
1385 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1386 #define a_argument required_argument
1387 static struct option const long_opts[] = {
1388 {"path", no_argument, NULL, 'p'},
1389 {"ldpath", no_argument, NULL, 'l'},
1390 {"recursive", no_argument, NULL, 'R'},
1391 {"mount", no_argument, NULL, 'm'},
1392 {"symlink", no_argument, NULL, 'y'},
1393 {"archives", no_argument, NULL, 'A'},
1394 {"ldcache", no_argument, NULL, 'L'},
1395 {"fix", no_argument, NULL, 'X'},
1396 {"setpax", a_argument, NULL, 'z'},
1397 {"pax", no_argument, NULL, 'x'},
1398 {"header", no_argument, NULL, 'e'},
1399 {"textrel", no_argument, NULL, 't'},
1400 {"rpath", no_argument, NULL, 'r'},
1401 {"needed", no_argument, NULL, 'n'},
1402 {"interp", no_argument, NULL, 'i'},
1403 {"bind", no_argument, NULL, 'b'},
1404 {"soname", no_argument, NULL, 'S'},
1405 {"symbol", a_argument, NULL, 's'},
1406 {"section", a_argument, NULL, 'k'},
1407 {"lib", a_argument, NULL, 'N'},
1408 {"gmatch", no_argument, NULL, 'g'},
1409 {"textrels", no_argument, NULL, 'T'},
1410 {"etype", a_argument, NULL, 'E'},
1411 {"bits", a_argument, NULL, 'M'},
1412 {"all", no_argument, NULL, 'a'},
1413 {"quiet", no_argument, NULL, 'q'},
1414 {"verbose", no_argument, NULL, 'v'},
1415 {"format", a_argument, NULL, 'F'},
1416 {"from", a_argument, NULL, 'f'},
1417 {"file", a_argument, NULL, 'o'},
1418 {"nobanner", no_argument, NULL, 'B'},
1419 {"help", no_argument, NULL, 'h'},
1420 {"version", no_argument, NULL, 'V'},
1421 {NULL, no_argument, NULL, 0x0}
1422 };
1423
1424 static const char *opts_help[] = {
1425 "Scan all directories in PATH environment",
1426 "Scan all directories in /etc/ld.so.conf",
1427 "Scan directories recursively",
1428 "Don't recursively cross mount points",
1429 "Don't scan symlinks",
1430 "Scan archives (.a files)",
1431 "Utilize ld.so.cache information (use with -r/-n)",
1432 "Try and 'fix' bad things (use with -r/-e)",
1433 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1434 "Print PaX markings",
1435 "Print GNU_STACK/PT_LOAD markings",
1436 "Print TEXTREL information",
1437 "Print RPATH information",
1438 "Print NEEDED information",
1439 "Print INTERP information",
1440 "Print BIND information",
1441 "Print SONAME information",
1442 "Find a specified symbol",
1443 "Find a specified section",
1444 "Find a specified library",
1445 "Use strncmp to match libraries. (use with -N)",
1446 "Locate cause of TEXTREL",
1447 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1448 "Print only ELF files matching numeric bits",
1449 "Print all scanned info (-x -e -t -r -b)\n",
1450 "Only output 'bad' things",
1451 "Be verbose (can be specified more than once)",
1452 "Use specified format for output",
1453 "Read input stream from a filename",
1454 "Write output stream to a filename",
1455 "Don't display the header",
1456 "Print this help and exit",
1457 "Print version and exit",
1458 NULL
1459 };
1460
1461 /* display usage and exit */
1462 static void usage(int status)
1463 {
1464 unsigned long i;
1465 printf("* Scan ELF binaries for stuff\n\n"
1466 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1467 printf("Options: -[%s]\n", PARSE_FLAGS);
1468 for (i = 0; long_opts[i].name; ++i)
1469 if (long_opts[i].has_arg == no_argument)
1470 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1471 long_opts[i].name, opts_help[i]);
1472 else
1473 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1474 long_opts[i].name, opts_help[i]);
1475
1476 if (status != EXIT_SUCCESS)
1477 exit(status);
1478
1479 puts("\nThe format modifiers for the -F option are:");
1480 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1481 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1482 puts(" i INTERP \tb BIND \ts symbol");
1483 puts(" N library \to Type \tT TEXTRELs");
1484 puts(" S SONAME \tk section");
1485 puts(" p filename (with search path removed)");
1486 puts(" f filename (short name/basename)");
1487 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1488
1489 puts("\nELF Etypes:");
1490 print_etypes(stdout);
1491
1492 exit(status);
1493 }
1494
1495 /* parse command line arguments and preform needed actions */
1496 static void parseargs(int argc, char *argv[])
1497 {
1498 int i;
1499 const char *from_file = NULL;
1500
1501 opterr = 0;
1502 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1503 switch (i) {
1504
1505 case 'V':
1506 printf("pax-utils-%s: %s compiled %s\n%s\n"
1507 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1508 VERSION, __FILE__, __DATE__, rcsid, argv0);
1509 exit(EXIT_SUCCESS);
1510 break;
1511 case 'h': usage(EXIT_SUCCESS); break;
1512 case 'f':
1513 if (from_file) warn("You prob don't want to specify -f twice");
1514 from_file = optarg;
1515 break;
1516 case 'E':
1517 strncpy(match_etypes, optarg, sizeof(match_etypes));
1518 break;
1519 case 'M':
1520 match_bits = atoi(optarg);
1521 break;
1522 case 'o': {
1523 FILE *fp = NULL;
1524 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1525 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1526 SET_STDOUT(fp);
1527 break;
1528 }
1529 case 'k':
1530 if (find_section) warn("You prob don't want to specify -k twice");
1531 find_section = optarg;
1532 break;
1533 case 's': {
1534 if (find_sym) warn("You prob don't want to specify -s twice");
1535 find_sym = optarg;
1536 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1537 sprintf(versioned_symname, "%s@", find_sym);
1538 break;
1539 }
1540 case 'N': {
1541 if (find_lib) warn("You prob don't want to specify -N twice");
1542 find_lib = optarg;
1543 break;
1544 }
1545
1546 case 'F': {
1547 if (out_format) warn("You prob don't want to specify -F twice");
1548 out_format = optarg;
1549 break;
1550 }
1551 case 'z': {
1552 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1553 size_t x;
1554
1555 for (x = 0 ; x < strlen(optarg); x++) {
1556 switch(optarg[x]) {
1557 case 'p':
1558 case 'P':
1559 do_state(optarg[x], PAGEEXEC);
1560 break;
1561 case 's':
1562 case 'S':
1563 do_state(optarg[x], SEGMEXEC);
1564 break;
1565 case 'm':
1566 case 'M':
1567 do_state(optarg[x], MPROTECT);
1568 break;
1569 case 'e':
1570 case 'E':
1571 do_state(optarg[x], EMUTRAMP);
1572 break;
1573 case 'r':
1574 case 'R':
1575 do_state(optarg[x], RANDMMAP);
1576 break;
1577 case 'x':
1578 case 'X':
1579 do_state(optarg[x], RANDEXEC);
1580 break;
1581 default:
1582 break;
1583 }
1584 }
1585 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1586 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1587 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1588 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1589 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1590 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1591 setpax = flags;
1592 break;
1593 }
1594 case 'g': gmatch = 1; break;
1595 case 'L': use_ldcache = 1; break;
1596 case 'y': scan_symlink = 0; break;
1597 case 'A': scan_archives = 1; break;
1598 case 'B': show_banner = 0; break;
1599 case 'l': scan_ldpath = 1; break;
1600 case 'p': scan_envpath = 1; break;
1601 case 'R': dir_recurse = 1; break;
1602 case 'm': dir_crossmount = 0; break;
1603 case 'X': ++fix_elf; break;
1604 case 'x': show_pax = 1; break;
1605 case 'e': show_phdr = 1; break;
1606 case 't': show_textrel = 1; break;
1607 case 'r': show_rpath = 1; break;
1608 case 'n': show_needed = 1; break;
1609 case 'i': show_interp = 1; break;
1610 case 'b': show_bind = 1; break;
1611 case 'S': show_soname = 1; break;
1612 case 'T': show_textrels = 1; break;
1613 case 'q': be_quiet = 1; break;
1614 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1615 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1616
1617 case ':':
1618 err("Option '%c' is missing parameter", optopt);
1619 case '?':
1620 err("Unknown option '%c' or argument missing", optopt);
1621 default:
1622 err("Unhandled option '%c'; please report this", i);
1623 }
1624 }
1625
1626 /* let the format option override all other options */
1627 if (out_format) {
1628 show_pax = show_phdr = show_textrel = show_rpath = \
1629 show_needed = show_interp = show_bind = show_soname = \
1630 show_textrels = 0;
1631 for (i = 0; out_format[i]; ++i) {
1632 if (!IS_MODIFIER(out_format[i])) continue;
1633
1634 switch (out_format[++i]) {
1635 case '+': break;
1636 case '%': break;
1637 case '#': break;
1638 case 'F': break;
1639 case 'p': break;
1640 case 'f': break;
1641 case 'k': break;
1642 case 's': break;
1643 case 'N': break;
1644 case 'o': break;
1645 case 'x': show_pax = 1; break;
1646 case 'e': show_phdr = 1; break;
1647 case 't': show_textrel = 1; break;
1648 case 'r': show_rpath = 1; break;
1649 case 'n': show_needed = 1; break;
1650 case 'i': show_interp = 1; break;
1651 case 'b': show_bind = 1; break;
1652 case 'S': show_soname = 1; break;
1653 case 'T': show_textrels = 1; break;
1654 default:
1655 err("Invalid format specifier '%c' (byte %i)",
1656 out_format[i], i+1);
1657 }
1658 }
1659
1660 /* construct our default format */
1661 } else {
1662 size_t fmt_len = 30;
1663 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1664 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1665 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1666 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1667 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1668 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1669 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1670 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1671 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1672 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1673 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1674 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1675 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1676 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1677 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1678 }
1679 if (be_verbose > 2) printf("Format: %s\n", out_format);
1680
1681 /* now lets actually do the scanning */
1682 if (scan_ldpath || use_ldcache)
1683 load_ld_so_conf(0, "/etc/ld.so.conf");
1684 if (scan_ldpath) scanelf_ldpath();
1685 if (scan_envpath) scanelf_envpath();
1686 if (!from_file && ttyname(0) == NULL)
1687 from_file = "-";
1688 if (from_file) {
1689 scanelf_from_file(from_file);
1690 from_file = *argv;
1691 }
1692 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1693 err("Nothing to scan !?");
1694 while (optind < argc) {
1695 search_path = argv[optind++];
1696 scanelf_dir(search_path);
1697 }
1698
1699 /* clean up */
1700 if (versioned_symname) free(versioned_symname);
1701 for (i = 0; ldpaths[i]; ++i)
1702 free(ldpaths[i]);
1703
1704 if (ldcache != 0)
1705 munmap(ldcache, ldcache_size);
1706 }
1707
1708
1709
1710 /* utility funcs */
1711 static char *xstrdup(const char *s)
1712 {
1713 char *ret = strdup(s);
1714 if (!ret) err("Could not strdup(): %s", strerror(errno));
1715 return ret;
1716 }
1717 static void *xmalloc(size_t size)
1718 {
1719 void *ret = malloc(size);
1720 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1721 return ret;
1722 }
1723 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1724 {
1725 size_t new_len;
1726
1727 new_len = strlen(*dst) + strlen(src);
1728 if (*curr_len <= new_len) {
1729 *curr_len = new_len + (*curr_len / 2);
1730 *dst = realloc(*dst, *curr_len);
1731 if (!*dst)
1732 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1733 }
1734
1735 if (n)
1736 strncat(*dst, src, n);
1737 else
1738 strcat(*dst, src);
1739 }
1740 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1741 {
1742 static char my_app[2];
1743 my_app[0] = append;
1744 my_app[1] = '\0';
1745 xstrcat(dst, my_app, curr_len);
1746 }
1747
1748
1749
1750 int main(int argc, char *argv[])
1751 {
1752 if (argc < 2)
1753 usage(EXIT_FAILURE);
1754 parseargs(argc, argv);
1755 fclose(stdout);
1756 #ifdef __BOUNDS_CHECKING_ON
1757 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1758 #endif
1759 return EXIT_SUCCESS;
1760 }

  ViewVC Help
Powered by ViewVC 1.1.20