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Revision 1.134 - (show annotations) (download) (as text)
Wed Mar 15 03:20:29 2006 UTC (8 years, 7 months ago) by vapier
Branch: MAIN
Changes since 1.133: +21 -5 lines
File MIME type: text/x-csrc
add support for scanning for just defined/undefined symbols

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 1.133 2006/03/08 05:32:53 vapier 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
12 static const char *rcsid = "$Id: scanelf.c,v 1.133 2006/03/08 05:32:53 vapier Exp $";
13 #define argv0 "scanelf"
14
15 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16
17
18 #define do_state(option, flag) \
19 if (islower(option)) { \
20 flags &= ~PF_##flag; \
21 flags |= PF_NO##flag; \
22 } else { \
23 flags &= ~PF_NO##flag; \
24 flags |= PF_##flag; \
25 }
26
27
28 /* prototypes */
29 static int scanelf_elfobj(elfobj *elf);
30 static int scanelf_elf(const char *filename, int fd, size_t len);
31 static int scanelf_archive(const char *filename, int fd, size_t len);
32 static void scanelf_file(const char *filename);
33 static void scanelf_dir(const char *path);
34 static void scanelf_ldpath(void);
35 static void scanelf_envpath(void);
36 static void usage(int status);
37 static void parseargs(int argc, char *argv[]);
38 static char *xstrdup(const char *s);
39 static void *xmalloc(size_t size);
40 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
41 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
42 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
43
44 /* variables to control behavior */
45 static char match_etypes[126] = "";
46 static char *ldpaths[256];
47 static char scan_ldpath = 0;
48 static char scan_envpath = 0;
49 static char scan_symlink = 1;
50 static char scan_archives = 0;
51 static char dir_recurse = 0;
52 static char dir_crossmount = 1;
53 static char show_pax = 0;
54 static char show_phdr = 0;
55 static char show_textrel = 0;
56 static char show_rpath = 0;
57 static char show_needed = 0;
58 static char show_interp = 0;
59 static char show_bind = 0;
60 static char show_soname = 0;
61 static char show_textrels = 0;
62 static char show_banner = 1;
63 static char be_quiet = 0;
64 static char be_verbose = 0;
65 static char be_wewy_wewy_quiet = 0;
66 static char be_semi_verbose = 0;
67 static char *find_sym = NULL, *versioned_symname = NULL;
68 static char *find_lib = NULL;
69 static char *find_section = NULL;
70 static char *out_format = NULL;
71 static char *search_path = NULL;
72 static char fix_elf = 0;
73 static char gmatch = 0;
74 static char use_ldcache = 0;
75
76 int match_bits = 0;
77 caddr_t ldcache = 0;
78 size_t ldcache_size = 0;
79 unsigned long setpax = 0UL;
80
81 /* sub-funcs for scanelf_file() */
82 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
83 {
84 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
85 #define GET_SYMTABS(B) \
86 if (elf->elf_class == ELFCLASS ## B) { \
87 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
88 /* debug sections */ \
89 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
90 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
91 /* runtime sections */ \
92 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
93 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
94 if (symtab && dynsym) { \
95 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
96 } else { \
97 *sym = (void*)(symtab ? symtab : dynsym); \
98 } \
99 if (strtab && dynstr) { \
100 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
101 } else { \
102 *tab = (void*)(strtab ? strtab : dynstr); \
103 } \
104 }
105 GET_SYMTABS(32)
106 GET_SYMTABS(64)
107 }
108
109 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
110 {
111 static char ret[7];
112 unsigned long i, shown;
113
114 if (!show_pax) return NULL;
115
116 shown = 0;
117 memset(&ret, 0, sizeof(ret));
118
119 if (elf->phdr) {
120 #define SHOW_PAX(B) \
121 if (elf->elf_class == ELFCLASS ## B) { \
122 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
123 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
124 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
125 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
126 continue; \
127 if (fix_elf && setpax) { \
128 /* set the paxctl flags */ \
129 ESET(phdr[i].p_flags, setpax); \
130 } \
131 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
132 continue; \
133 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
134 *found_pax = 1; \
135 ++shown; \
136 break; \
137 } \
138 }
139 SHOW_PAX(32)
140 SHOW_PAX(64)
141 }
142
143
144 if (fix_elf && setpax) {
145 /* set the chpax settings */
146 if (elf->elf_class == ELFCLASS32) {
147 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
148 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
149 } else {
150 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
151 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
152 }
153 }
154
155 /* fall back to EI_PAX if no PT_PAX was found */
156 if (!*ret) {
157 static char *paxflags;
158 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
159 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
160 *found_pax = 1;
161 return (be_wewy_wewy_quiet ? NULL : paxflags);
162 }
163 strncpy(ret, paxflags, sizeof(ret));
164 }
165
166 if (be_wewy_wewy_quiet || (be_quiet && !shown))
167 return NULL;
168 else
169 return ret;
170 }
171
172 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
173 {
174 static char ret[12];
175 char *found;
176 unsigned long i, shown, multi_stack, multi_relro, multi_load;
177 int max_pt_load;
178
179 if (!show_phdr) return NULL;
180
181 memcpy(ret, "--- --- ---\0", 12);
182
183 shown = 0;
184 multi_stack = multi_relro = multi_load = 0;
185 max_pt_load = elf_max_pt_load(elf);
186
187 #define NOTE_GNU_STACK ".note.GNU-stack"
188 #define SHOW_PHDR(B) \
189 if (elf->elf_class == ELFCLASS ## B) { \
190 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
191 Elf ## B ## _Off offset; \
192 uint32_t flags, check_flags; \
193 if (elf->phdr != NULL) { \
194 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
195 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
196 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
197 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
198 found = found_phdr; \
199 offset = 0; \
200 check_flags = PF_X; \
201 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
202 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
203 found = found_relro; \
204 offset = 4; \
205 check_flags = PF_X; \
206 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
207 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
208 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
209 found = found_load; \
210 offset = 8; \
211 check_flags = PF_W|PF_X; \
212 } else \
213 continue; \
214 flags = EGET(phdr[i].p_flags); \
215 if (be_quiet && ((flags & check_flags) != check_flags)) \
216 continue; \
217 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
218 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
219 ret[3] = ret[7] = '!'; \
220 flags = EGET(phdr[i].p_flags); \
221 } \
222 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
223 *found = 1; \
224 ++shown; \
225 } \
226 } else if (elf->shdr != NULL) { \
227 /* no program headers which means this is prob an object file */ \
228 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
229 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
230 char *str; \
231 if ((void*)strtbl > (void*)elf->data_end) \
232 goto skip_this_shdr##B; \
233 check_flags = SHF_WRITE|SHF_EXECINSTR; \
234 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
235 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
236 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
237 str = elf->data + offset; \
238 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
239 if (!strcmp(str, NOTE_GNU_STACK)) { \
240 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
241 flags = EGET(shdr[i].sh_flags); \
242 if (be_quiet && ((flags & check_flags) != check_flags)) \
243 continue; \
244 ++*found_phdr; \
245 shown = 1; \
246 if (flags & SHF_WRITE) ret[0] = 'W'; \
247 if (flags & SHF_ALLOC) ret[1] = 'A'; \
248 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
249 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
250 break; \
251 } \
252 } \
253 skip_this_shdr##B: \
254 if (!multi_stack) { \
255 *found_phdr = 1; \
256 shown = 1; \
257 memcpy(ret, "!WX", 3); \
258 } \
259 } \
260 }
261 SHOW_PHDR(32)
262 SHOW_PHDR(64)
263
264 if (be_wewy_wewy_quiet || (be_quiet && !shown))
265 return NULL;
266 else
267 return ret;
268 }
269 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
270 {
271 static const char *ret = "TEXTREL";
272 unsigned long i;
273
274 if (!show_textrel && !show_textrels) return NULL;
275
276 if (elf->phdr) {
277 #define SHOW_TEXTREL(B) \
278 if (elf->elf_class == ELFCLASS ## B) { \
279 Elf ## B ## _Dyn *dyn; \
280 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
281 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
282 Elf ## B ## _Off offset; \
283 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
284 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
285 offset = EGET(phdr[i].p_offset); \
286 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
287 dyn = DYN ## B (elf->data + offset); \
288 while (EGET(dyn->d_tag) != DT_NULL) { \
289 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
290 *found_textrel = 1; \
291 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
292 return (be_wewy_wewy_quiet ? NULL : ret); \
293 } \
294 ++dyn; \
295 } \
296 } }
297 SHOW_TEXTREL(32)
298 SHOW_TEXTREL(64)
299 }
300
301 if (be_quiet || be_wewy_wewy_quiet)
302 return NULL;
303 else
304 return " - ";
305 }
306 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
307 {
308 unsigned long s, r, rmax;
309 void *symtab_void, *strtab_void, *text_void;
310
311 if (!show_textrels) return NULL;
312
313 /* don't search for TEXTREL's if the ELF doesn't have any */
314 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
315 if (!*found_textrel) return NULL;
316
317 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
318 text_void = elf_findsecbyname(elf, ".text");
319
320 if (symtab_void && strtab_void && text_void && elf->shdr) {
321 #define SHOW_TEXTRELS(B) \
322 if (elf->elf_class == ELFCLASS ## B) { \
323 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
324 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
325 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
326 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
327 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
328 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
329 uint ## B ## _t memsz = EGET(text->sh_size); \
330 Elf ## B ## _Rel *rel; \
331 Elf ## B ## _Rela *rela; \
332 /* search the section headers for relocations */ \
333 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
334 uint32_t sh_type = EGET(shdr[s].sh_type); \
335 if (sh_type == SHT_REL) { \
336 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
337 rela = NULL; \
338 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
339 } else if (sh_type == SHT_RELA) { \
340 rel = NULL; \
341 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
342 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
343 } else \
344 continue; \
345 /* now see if any of the relocs are in the .text */ \
346 for (r = 0; r < rmax; ++r) { \
347 unsigned long sym_max; \
348 Elf ## B ## _Addr offset_tmp; \
349 Elf ## B ## _Sym *func; \
350 Elf ## B ## _Sym *sym; \
351 Elf ## B ## _Addr r_offset; \
352 uint ## B ## _t r_info; \
353 if (sh_type == SHT_REL) { \
354 r_offset = EGET(rel[r].r_offset); \
355 r_info = EGET(rel[r].r_info); \
356 } else { \
357 r_offset = EGET(rela[r].r_offset); \
358 r_info = EGET(rela[r].r_info); \
359 } \
360 /* make sure this relocation is inside of the .text */ \
361 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
362 if (be_verbose <= 2) continue; \
363 } else \
364 *found_textrels = 1; \
365 /* locate this relocation symbol name */ \
366 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
367 if ((void*)sym > (void*)elf->data_end) { \
368 warn("%s: corrupt ELF symbol", elf->filename); \
369 continue; \
370 } \
371 sym_max = ELF ## B ## _R_SYM(r_info); \
372 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
373 sym += sym_max; \
374 else \
375 sym = NULL; \
376 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
377 /* show the raw details about this reloc */ \
378 printf(" %s: ", elf->base_filename); \
379 if (sym && sym->st_name) \
380 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
381 else \
382 printf("(memory/fake?)"); \
383 printf(" [0x%lX]", (unsigned long)r_offset); \
384 /* now try to find the closest symbol that this rel is probably in */ \
385 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
386 func = NULL; \
387 offset_tmp = 0; \
388 while (sym_max--) { \
389 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
390 func = sym; \
391 offset_tmp = EGET(sym->st_value); \
392 } \
393 ++sym; \
394 } \
395 printf(" in "); \
396 if (func && func->st_name) \
397 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
398 else \
399 printf("(NULL: fake?)"); \
400 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
401 } \
402 } }
403 SHOW_TEXTRELS(32)
404 SHOW_TEXTRELS(64)
405 }
406 if (!*found_textrels)
407 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
408
409 return NULL;
410 }
411
412 static void rpath_security_checks(elfobj *, char *, const char *);
413 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
414 {
415 struct stat st;
416 switch (*item) {
417 case '/': break;
418 case '.':
419 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
420 break;
421 case ':':
422 case '\0':
423 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
424 break;
425 case '$':
426 if (fstat(elf->fd, &st) != -1)
427 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
428 warnf("Security problem with %s='%s' in %s with mode set of %o",
429 dt_type, item, elf->filename, st.st_mode & 07777);
430 break;
431 default:
432 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
433 break;
434 }
435 }
436 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
437 {
438 unsigned long i, s;
439 char *rpath, *runpath, **r;
440 void *strtbl_void;
441
442 if (!show_rpath) return;
443
444 strtbl_void = elf_findsecbyname(elf, ".dynstr");
445 rpath = runpath = NULL;
446
447 if (elf->phdr && strtbl_void) {
448 #define SHOW_RPATH(B) \
449 if (elf->elf_class == ELFCLASS ## B) { \
450 Elf ## B ## _Dyn *dyn; \
451 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
452 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
453 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
454 Elf ## B ## _Off offset; \
455 Elf ## B ## _Xword word; \
456 /* Scan all the program headers */ \
457 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
458 /* Just scan dynamic headers */ \
459 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
460 offset = EGET(phdr[i].p_offset); \
461 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
462 /* Just scan dynamic RPATH/RUNPATH headers */ \
463 dyn = DYN ## B (elf->data + offset); \
464 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
465 if (word == DT_RPATH) { \
466 r = &rpath; \
467 } else if (word == DT_RUNPATH) { \
468 r = &runpath; \
469 } else { \
470 ++dyn; \
471 continue; \
472 } \
473 /* Verify the memory is somewhat sane */ \
474 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
475 if (offset < (Elf ## B ## _Off)elf->len) { \
476 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
477 *r = (char*)(elf->data + offset); \
478 /* cache the length in case we need to nuke this section later on */ \
479 if (fix_elf) \
480 offset = strlen(*r); \
481 /* If quiet, don't output paths in ld.so.conf */ \
482 if (be_quiet) { \
483 size_t len; \
484 char *start, *end; \
485 /* note that we only 'chop' off leading known paths. */ \
486 /* since *r is read-only memory, we can only move the ptr forward. */ \
487 start = *r; \
488 /* scan each path in : delimited list */ \
489 while (start) { \
490 rpath_security_checks(elf, start, get_elfdtype(word)); \
491 end = strchr(start, ':'); \
492 len = (end ? abs(end - start) : strlen(start)); \
493 if (use_ldcache) \
494 for (s = 0; ldpaths[s]; ++s) \
495 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
496 *r = end; \
497 /* corner case ... if RPATH reads "/usr/lib:", we want \
498 * to show ':' rather than '' */ \
499 if (end && end[1] != '\0') \
500 (*r)++; \
501 break; \
502 } \
503 if (!*r || !end) \
504 break; \
505 else \
506 start = start + len + 1; \
507 } \
508 } \
509 if (*r) { \
510 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
511 /* just nuke it */ \
512 nuke_it##B: \
513 memset(*r, 0x00, offset); \
514 *r = NULL; \
515 ESET(dyn->d_tag, DT_DEBUG); \
516 ESET(dyn->d_un.d_ptr, 0); \
517 } else if (fix_elf) { \
518 /* try to clean "bad" paths */ \
519 size_t len, tmpdir_len; \
520 char *start, *end; \
521 const char *tmpdir; \
522 start = *r; \
523 tmpdir = (getenv("TMPDIR") ? : "."); \
524 tmpdir_len = strlen(tmpdir); \
525 while (1) { \
526 end = strchr(start, ':'); \
527 if (start == end) { \
528 eat_this_path##B: \
529 len = strlen(end); \
530 memmove(start, end+1, len); \
531 start[len-1] = '\0'; \
532 end = start - 1; \
533 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
534 if (!end) { \
535 if (start == *r) \
536 goto nuke_it##B; \
537 *--start = '\0'; \
538 } else \
539 goto eat_this_path##B; \
540 } \
541 if (!end) \
542 break; \
543 start = end + 1; \
544 } \
545 if (**r == '\0') \
546 goto nuke_it##B; \
547 } \
548 if (*r) \
549 *found_rpath = 1; \
550 } \
551 } \
552 ++dyn; \
553 } \
554 } }
555 SHOW_RPATH(32)
556 SHOW_RPATH(64)
557 }
558
559 if (be_wewy_wewy_quiet) return;
560
561 if (rpath && runpath) {
562 if (!strcmp(rpath, runpath)) {
563 xstrcat(ret, runpath, ret_len);
564 } else {
565 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
566 xchrcat(ret, '{', ret_len);
567 xstrcat(ret, rpath, ret_len);
568 xchrcat(ret, ',', ret_len);
569 xstrcat(ret, runpath, ret_len);
570 xchrcat(ret, '}', ret_len);
571 }
572 } else if (rpath || runpath)
573 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
574 else if (!be_quiet)
575 xstrcat(ret, " - ", ret_len);
576 }
577
578 #define LDSO_CACHE_MAGIC "ld.so-"
579 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
580 #define LDSO_CACHE_VER "1.7.0"
581 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
582 #define FLAG_ANY -1
583 #define FLAG_TYPE_MASK 0x00ff
584 #define FLAG_LIBC4 0x0000
585 #define FLAG_ELF 0x0001
586 #define FLAG_ELF_LIBC5 0x0002
587 #define FLAG_ELF_LIBC6 0x0003
588 #define FLAG_REQUIRED_MASK 0xff00
589 #define FLAG_SPARC_LIB64 0x0100
590 #define FLAG_IA64_LIB64 0x0200
591 #define FLAG_X8664_LIB64 0x0300
592 #define FLAG_S390_LIB64 0x0400
593 #define FLAG_POWERPC_LIB64 0x0500
594 #define FLAG_MIPS64_LIBN32 0x0600
595 #define FLAG_MIPS64_LIBN64 0x0700
596
597 static char *lookup_cache_lib(elfobj *, char *);
598 static char *lookup_cache_lib(elfobj *elf, char *fname)
599 {
600 int fd = 0;
601 char *strs;
602 static char buf[__PAX_UTILS_PATH_MAX] = "";
603 const char *cachefile = "/etc/ld.so.cache";
604 struct stat st;
605
606 typedef struct {
607 char magic[LDSO_CACHE_MAGIC_LEN];
608 char version[LDSO_CACHE_VER_LEN];
609 int nlibs;
610 } header_t;
611 header_t *header;
612
613 typedef struct {
614 int flags;
615 int sooffset;
616 int liboffset;
617 } libentry_t;
618 libentry_t *libent;
619
620 if (fname == NULL)
621 return NULL;
622
623 if (ldcache == 0) {
624 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
625 return NULL;
626
627 /* cache these values so we only map/unmap the cache file once */
628 ldcache_size = st.st_size;
629 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
630
631 close(fd);
632
633 if (ldcache == (caddr_t)-1) {
634 ldcache = 0;
635 return NULL;
636 }
637
638 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
639 return NULL;
640 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
641 return NULL;
642 }
643
644 header = (header_t *) ldcache;
645 libent = (libentry_t *) (ldcache + sizeof(header_t));
646 strs = (char *) &libent[header->nlibs];
647
648 for (fd = 0; fd < header->nlibs; fd++) {
649 /* this should be more fine grained, but for now we assume that
650 * diff arches will not be cached together. and we ignore the
651 * the different multilib mips cases. */
652 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
653 continue;
654 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
655 continue;
656
657 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
658 continue;
659 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
660 }
661 return buf;
662 }
663
664
665 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
666 {
667 unsigned long i;
668 char *needed;
669 void *strtbl_void;
670 char *p;
671
672 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
673
674 strtbl_void = elf_findsecbyname(elf, ".dynstr");
675
676 if (elf->phdr && strtbl_void) {
677 #define SHOW_NEEDED(B) \
678 if (elf->elf_class == ELFCLASS ## B) { \
679 Elf ## B ## _Dyn *dyn; \
680 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
681 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
682 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
683 Elf ## B ## _Off offset; \
684 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
685 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
686 offset = EGET(phdr[i].p_offset); \
687 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
688 dyn = DYN ## B (elf->data + offset); \
689 while (EGET(dyn->d_tag) != DT_NULL) { \
690 if (EGET(dyn->d_tag) == DT_NEEDED) { \
691 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
692 if (offset >= (Elf ## B ## _Off)elf->len) { \
693 ++dyn; \
694 continue; \
695 } \
696 needed = (char*)(elf->data + offset); \
697 if (op == 0) { \
698 if (!be_wewy_wewy_quiet) { \
699 if (*found_needed) xchrcat(ret, ',', ret_len); \
700 if (use_ldcache) \
701 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
702 needed = p; \
703 xstrcat(ret, needed, ret_len); \
704 } \
705 *found_needed = 1; \
706 } else { \
707 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
708 *found_lib = 1; \
709 return (be_wewy_wewy_quiet ? NULL : needed); \
710 } \
711 } \
712 } \
713 ++dyn; \
714 } \
715 } }
716 SHOW_NEEDED(32)
717 SHOW_NEEDED(64)
718 if (op == 0 && !*found_needed && be_verbose)
719 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
720 }
721
722 return NULL;
723 }
724 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
725 {
726 void *strtbl_void;
727
728 if (!show_interp) return NULL;
729
730 strtbl_void = elf_findsecbyname(elf, ".interp");
731
732 if (strtbl_void) {
733 #define SHOW_INTERP(B) \
734 if (elf->elf_class == ELFCLASS ## B) { \
735 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
736 *found_interp = 1; \
737 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
738 }
739 SHOW_INTERP(32)
740 SHOW_INTERP(64)
741 }
742 return NULL;
743 }
744 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
745 {
746 unsigned long i;
747 struct stat s;
748 char dynamic = 0;
749
750 if (!show_bind) return NULL;
751 if (!elf->phdr) return NULL;
752
753 #define SHOW_BIND(B) \
754 if (elf->elf_class == ELFCLASS ## B) { \
755 Elf ## B ## _Dyn *dyn; \
756 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
757 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
758 Elf ## B ## _Off offset; \
759 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
760 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
761 dynamic = 1; \
762 offset = EGET(phdr[i].p_offset); \
763 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
764 dyn = DYN ## B (elf->data + offset); \
765 while (EGET(dyn->d_tag) != DT_NULL) { \
766 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
767 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
768 { \
769 if (be_quiet) return NULL; \
770 *found_bind = 1; \
771 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
772 } \
773 ++dyn; \
774 } \
775 } \
776 }
777 SHOW_BIND(32)
778 SHOW_BIND(64)
779
780 if (be_wewy_wewy_quiet) return NULL;
781
782 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
783 return NULL;
784 } else {
785 *found_bind = 1;
786 return (char *) (dynamic ? "LAZY" : "STATIC");
787 }
788 }
789 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
790 {
791 unsigned long i;
792 char *soname;
793 void *strtbl_void;
794
795 if (!show_soname) return NULL;
796
797 strtbl_void = elf_findsecbyname(elf, ".dynstr");
798
799 if (elf->phdr && strtbl_void) {
800 #define SHOW_SONAME(B) \
801 if (elf->elf_class == ELFCLASS ## B) { \
802 Elf ## B ## _Dyn *dyn; \
803 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
804 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
805 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
806 Elf ## B ## _Off offset; \
807 /* only look for soname in shared objects */ \
808 if (ehdr->e_type != ET_DYN) \
809 return NULL; \
810 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
811 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
812 offset = EGET(phdr[i].p_offset); \
813 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
814 dyn = DYN ## B (elf->data + offset); \
815 while (EGET(dyn->d_tag) != DT_NULL) { \
816 if (EGET(dyn->d_tag) == DT_SONAME) { \
817 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
818 if (offset >= (Elf ## B ## _Off)elf->len) { \
819 ++dyn; \
820 continue; \
821 } \
822 soname = (char*)(elf->data + offset); \
823 *found_soname = 1; \
824 return (be_wewy_wewy_quiet ? NULL : soname); \
825 } \
826 ++dyn; \
827 } \
828 } }
829 SHOW_SONAME(32)
830 SHOW_SONAME(64)
831 }
832
833 return NULL;
834 }
835 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
836 {
837 unsigned long i;
838 char *ret;
839 void *symtab_void, *strtab_void;
840
841 if (!find_sym) return NULL;
842 ret = find_sym;
843
844 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
845
846 if (symtab_void && strtab_void) {
847 #define FIND_SYM(B) \
848 if (elf->elf_class == ELFCLASS ## B) { \
849 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
850 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
851 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
852 unsigned long cnt = EGET(symtab->sh_entsize); \
853 char *symname; \
854 if (cnt) \
855 cnt = EGET(symtab->sh_size) / cnt; \
856 for (i = 0; i < cnt; ++i) { \
857 if (sym->st_name) { \
858 /* make sure the symbol name is in acceptable memory range */ \
859 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
860 if ((void*)symname > (void*)elf->data_end) { \
861 warnf("%s: corrupt ELF symbols", elf->filename); \
862 ++sym; \
863 continue; \
864 } \
865 /* debug display ... show all symbols and some extra info */ \
866 if (*ret == '*') { \
867 printf("%s(%s) %5lX %15s %s\n", \
868 ((*found_sym == 0) ? "\n\t" : "\t"), \
869 elf->base_filename, \
870 (unsigned long)sym->st_size, \
871 get_elfstttype(sym->st_info), \
872 symname); \
873 *found_sym = 1; \
874 } else { \
875 /* allow the user to specify a comma delimited list of symbols to search for */ \
876 char *this_sym, *next_sym; \
877 this_sym = ret; \
878 do { \
879 next_sym = strchr(this_sym, ','); \
880 if (next_sym == NULL) \
881 next_sym = this_sym + strlen(this_sym); \
882 /* do we want a defined symbol ? */ \
883 if (*this_sym == '+') { \
884 if (sym->st_value == 0) \
885 goto skip_this_sym##B; \
886 ++this_sym; \
887 /* do we want an undefined symbol ? */ \
888 } else if (*this_sym == '-') { \
889 if (sym->st_value != 0) \
890 goto skip_this_sym##B; \
891 ++this_sym; \
892 } \
893 /* ok, lets compare the name now */ \
894 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
895 (strcmp(symname, versioned_symname) == 0)) { \
896 if (be_semi_verbose) { \
897 char buf[126]; \
898 snprintf(buf, sizeof(buf), "%lX %s %s", \
899 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
900 ret = buf; \
901 } else \
902 ret = this_sym; \
903 (*found_sym)++; \
904 goto break_out; \
905 } \
906 skip_this_sym##B: this_sym = next_sym + 1; \
907 } while (*next_sym != '\0'); \
908 } \
909 } \
910 ++sym; \
911 } }
912 FIND_SYM(32)
913 FIND_SYM(64)
914 }
915
916 break_out:
917 if (be_wewy_wewy_quiet) return NULL;
918
919 if (*find_sym != '*' && *found_sym)
920 return ret;
921 if (be_quiet)
922 return NULL;
923 else
924 return (char *)" - ";
925 }
926
927
928 static char *scanelf_file_sections(elfobj *elf, char *found_section)
929 {
930 if (!find_section)
931 return NULL;
932
933 #define FIND_SECTION(B) \
934 if (elf->elf_class == ELFCLASS ## B) { \
935 Elf ## B ## _Shdr *section; \
936 section = SHDR ## B (elf_findsecbyname(elf, find_section)); \
937 if (section != NULL) \
938 *found_section = 1; \
939 }
940 FIND_SECTION(32)
941 FIND_SECTION(64)
942
943
944 if (be_wewy_wewy_quiet) return NULL;
945
946 if (*found_section)
947 return find_section;
948
949 if (be_quiet)
950 return NULL;
951 else
952 return (char *)" - ";
953 }
954
955 /* scan an elf file and show all the fun stuff */
956 #define prints(str) write(fileno(stdout), str, strlen(str))
957 static int scanelf_elfobj(elfobj *elf)
958 {
959 unsigned long i;
960 char found_pax, found_phdr, found_relro, found_load, found_textrel,
961 found_rpath, found_needed, found_interp, found_bind, found_soname,
962 found_sym, found_lib, found_file, found_textrels, found_section;
963 static char *out_buffer = NULL;
964 static size_t out_len;
965
966 found_pax = found_phdr = found_relro = found_load = found_textrel = \
967 found_rpath = found_needed = found_interp = found_bind = found_soname = \
968 found_sym = found_lib = found_file = found_textrels = found_section = 0;
969
970 if (be_verbose > 2)
971 printf("%s: scanning file {%s,%s}\n", elf->filename,
972 get_elfeitype(EI_CLASS, elf->elf_class),
973 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
974 else if (be_verbose > 1)
975 printf("%s: scanning file\n", elf->filename);
976
977 /* init output buffer */
978 if (!out_buffer) {
979 out_len = sizeof(char) * 80;
980 out_buffer = (char*)xmalloc(out_len);
981 }
982 *out_buffer = '\0';
983
984 /* show the header */
985 if (!be_quiet && show_banner) {
986 for (i = 0; out_format[i]; ++i) {
987 if (!IS_MODIFIER(out_format[i])) continue;
988
989 switch (out_format[++i]) {
990 case '+': break;
991 case '%': break;
992 case '#': break;
993 case 'F':
994 case 'p':
995 case 'f': prints("FILE "); found_file = 1; break;
996 case 'o': prints(" TYPE "); break;
997 case 'x': prints(" PAX "); break;
998 case 'e': prints("STK/REL/PTL "); break;
999 case 't': prints("TEXTREL "); break;
1000 case 'r': prints("RPATH "); break;
1001 case 'n': prints("NEEDED "); break;
1002 case 'i': prints("INTERP "); break;
1003 case 'b': prints("BIND "); break;
1004 case 'S': prints("SONAME "); break;
1005 case 's': prints("SYM "); break;
1006 case 'N': prints("LIB "); break;
1007 case 'T': prints("TEXTRELS "); break;
1008 case 'k': prints("SECTION "); break;
1009 default: warnf("'%c' has no title ?", out_format[i]);
1010 }
1011 }
1012 if (!found_file) prints("FILE ");
1013 prints("\n");
1014 found_file = 0;
1015 show_banner = 0;
1016 }
1017
1018 /* dump all the good stuff */
1019 for (i = 0; out_format[i]; ++i) {
1020 const char *out;
1021 const char *tmp;
1022
1023 if (!IS_MODIFIER(out_format[i])) {
1024 xchrcat(&out_buffer, out_format[i], &out_len);
1025 continue;
1026 }
1027
1028 out = NULL;
1029 be_wewy_wewy_quiet = (out_format[i] == '#');
1030 be_semi_verbose = (out_format[i] == '+');
1031 switch (out_format[++i]) {
1032 case '+':
1033 case '%':
1034 case '#':
1035 xchrcat(&out_buffer, out_format[i], &out_len); break;
1036 case 'F':
1037 found_file = 1;
1038 if (be_wewy_wewy_quiet) break;
1039 xstrcat(&out_buffer, elf->filename, &out_len);
1040 break;
1041 case 'p':
1042 found_file = 1;
1043 if (be_wewy_wewy_quiet) break;
1044 tmp = elf->filename;
1045 if (search_path) {
1046 ssize_t len_search = strlen(search_path);
1047 ssize_t len_file = strlen(elf->filename);
1048 if (!strncmp(elf->filename, search_path, len_search) && \
1049 len_file > len_search)
1050 tmp += len_search;
1051 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1052 }
1053 xstrcat(&out_buffer, tmp, &out_len);
1054 break;
1055 case 'f':
1056 found_file = 1;
1057 if (be_wewy_wewy_quiet) break;
1058 tmp = strrchr(elf->filename, '/');
1059 tmp = (tmp == NULL ? elf->filename : tmp+1);
1060 xstrcat(&out_buffer, tmp, &out_len);
1061 break;
1062 case 'o': out = get_elfetype(elf); break;
1063 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1064 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1065 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1066 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1067 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1068 case 'n':
1069 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1070 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1071 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1072 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1073 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1074 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1075 default: warnf("'%c' has no scan code?", out_format[i]);
1076 }
1077 if (out) {
1078 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1079 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1080 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1081 else
1082 xstrcat(&out_buffer, out, &out_len);
1083 }
1084 }
1085
1086 #define FOUND_SOMETHING() \
1087 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1088 found_rpath || found_needed || found_interp || found_bind || \
1089 found_soname || found_sym || found_lib || found_textrels || found_section )
1090
1091 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1092 xchrcat(&out_buffer, ' ', &out_len);
1093 xstrcat(&out_buffer, elf->filename, &out_len);
1094 }
1095 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1096 puts(out_buffer);
1097 fflush(stdout);
1098 }
1099
1100 return 0;
1101 }
1102
1103 /* scan a single elf */
1104 static int scanelf_elf(const char *filename, int fd, size_t len)
1105 {
1106 int ret = 1;
1107 elfobj *elf;
1108
1109 /* verify this is real ELF */
1110 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1111 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1112 return ret;
1113 }
1114 switch (match_bits) {
1115 case 32:
1116 if (elf->elf_class != ELFCLASS32)
1117 goto label_done;
1118 break;
1119 case 64:
1120 if (elf->elf_class != ELFCLASS64)
1121 goto label_done;
1122 break;
1123 default: break;
1124 }
1125 if (strlen(match_etypes)) {
1126 char sbuf[126];
1127 strncpy(sbuf, match_etypes, sizeof(sbuf));
1128 if (strchr(match_etypes, ',') != NULL) {
1129 char *p;
1130 while((p = strrchr(sbuf, ',')) != NULL) {
1131 *p = 0;
1132 if (etype_lookup(p+1) == get_etype(elf))
1133 goto label_ret;
1134 }
1135 }
1136 if (etype_lookup(sbuf) != get_etype(elf))
1137 goto label_done;
1138 }
1139
1140 label_ret:
1141 ret = scanelf_elfobj(elf);
1142
1143 label_done:
1144 unreadelf(elf);
1145 return ret;
1146 }
1147
1148 /* scan an archive of elfs */
1149 static int scanelf_archive(const char *filename, int fd, size_t len)
1150 {
1151 archive_handle *ar;
1152 archive_member *m;
1153 char *ar_buffer;
1154 elfobj *elf;
1155
1156 ar = ar_open_fd(filename, fd);
1157 if (ar == NULL)
1158 return 1;
1159
1160 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1161 while ((m=ar_next(ar)) != NULL) {
1162 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1163 if (elf) {
1164 scanelf_elfobj(elf);
1165 unreadelf(elf);
1166 }
1167 }
1168 munmap(ar_buffer, len);
1169
1170 return 0;
1171 }
1172 /* scan a file which may be an elf or an archive or some other magical beast */
1173 static void scanelf_file(const char *filename)
1174 {
1175 struct stat st;
1176 int fd;
1177
1178 /* make sure 'filename' exists */
1179 if (lstat(filename, &st) == -1) {
1180 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1181 return;
1182 }
1183
1184 /* always handle regular files and handle symlinked files if no -y */
1185 if (S_ISLNK(st.st_mode)) {
1186 if (!scan_symlink) return;
1187 stat(filename, &st);
1188 }
1189 if (!S_ISREG(st.st_mode)) {
1190 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1191 return;
1192 }
1193
1194 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1195 return;
1196
1197 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1198 /* if it isn't an ELF, maybe it's an .a archive */
1199 scanelf_archive(filename, fd, st.st_size);
1200
1201 close(fd);
1202 }
1203
1204 /* scan a directory for ET_EXEC files and print when we find one */
1205 static void scanelf_dir(const char *path)
1206 {
1207 register DIR *dir;
1208 register struct dirent *dentry;
1209 struct stat st_top, st;
1210 char buf[__PAX_UTILS_PATH_MAX];
1211 size_t pathlen = 0, len = 0;
1212
1213 /* make sure path exists */
1214 if (lstat(path, &st_top) == -1) {
1215 if (be_verbose > 2) printf("%s: does not exist\n", path);
1216 return;
1217 }
1218
1219 /* ok, if it isn't a directory, assume we can open it */
1220 if (!S_ISDIR(st_top.st_mode)) {
1221 scanelf_file(path);
1222 return;
1223 }
1224
1225 /* now scan the dir looking for fun stuff */
1226 if ((dir = opendir(path)) == NULL) {
1227 warnf("could not opendir %s: %s", path, strerror(errno));
1228 return;
1229 }
1230 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1231
1232 pathlen = strlen(path);
1233 while ((dentry = readdir(dir))) {
1234 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1235 continue;
1236 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1237 if (len >= sizeof(buf)) {
1238 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1239 (unsigned long)len, (unsigned long)sizeof(buf));
1240 continue;
1241 }
1242 sprintf(buf, "%s/%s", path, dentry->d_name);
1243 if (lstat(buf, &st) != -1) {
1244 if (S_ISREG(st.st_mode))
1245 scanelf_file(buf);
1246 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1247 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1248 scanelf_dir(buf);
1249 }
1250 }
1251 }
1252 closedir(dir);
1253 }
1254
1255 static int scanelf_from_file(const char *filename)
1256 {
1257 FILE *fp = NULL;
1258 char *p;
1259 char path[__PAX_UTILS_PATH_MAX];
1260
1261 if (strcmp(filename, "-") == 0)
1262 fp = stdin;
1263 else if ((fp = fopen(filename, "r")) == NULL)
1264 return 1;
1265
1266 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1267 if ((p = strchr(path, '\n')) != NULL)
1268 *p = 0;
1269 search_path = path;
1270 scanelf_dir(path);
1271 }
1272 if (fp != stdin)
1273 fclose(fp);
1274 return 0;
1275 }
1276
1277 static int load_ld_so_conf(int i, const char *fname)
1278 {
1279 FILE *fp = NULL;
1280 char *p;
1281 char path[__PAX_UTILS_PATH_MAX];
1282
1283 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1284 return i;
1285
1286 if ((fp = fopen(fname, "r")) == NULL)
1287 return i;
1288
1289 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1290 if ((p = strrchr(path, '\r')) != NULL)
1291 *p = 0;
1292 if ((p = strchr(path, '\n')) != NULL)
1293 *p = 0;
1294 #ifdef HAVE_GLOB
1295 // recursive includes of the same file will make this segfault.
1296 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1297 glob64_t gl;
1298 size_t x;
1299 char gpath[__PAX_UTILS_PATH_MAX];
1300
1301 memset(gpath, 0, sizeof(gpath));
1302
1303 if (path[8] != '/')
1304 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1305 else
1306 strncpy(gpath, &path[8], sizeof(gpath));
1307
1308 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1309 for (x = 0; x < gl.gl_pathc; ++x) {
1310 /* try to avoid direct loops */
1311 if (strcmp(gl.gl_pathv[x], fname) == 0)
1312 continue;
1313 i = load_ld_so_conf(i, gl.gl_pathv[x]);
1314 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1315 globfree64(&gl);
1316 return i;
1317 }
1318 }
1319 globfree64 (&gl);
1320 continue;
1321 } else
1322 abort();
1323 }
1324 #endif
1325 if (*path != '/')
1326 continue;
1327
1328 ldpaths[i++] = xstrdup(path);
1329
1330 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1331 break;
1332 }
1333 ldpaths[i] = NULL;
1334
1335 fclose(fp);
1336 return i;
1337 }
1338
1339 /* scan /etc/ld.so.conf for paths */
1340 static void scanelf_ldpath()
1341 {
1342 char scan_l, scan_ul, scan_ull;
1343 int i = 0;
1344
1345 if (!ldpaths[0])
1346 err("Unable to load any paths from ld.so.conf");
1347
1348 scan_l = scan_ul = scan_ull = 0;
1349
1350 while (ldpaths[i]) {
1351 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1352 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1353 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1354 scanelf_dir(ldpaths[i]);
1355 ++i;
1356 }
1357
1358 if (!scan_l) scanelf_dir("/lib");
1359 if (!scan_ul) scanelf_dir("/usr/lib");
1360 if (!scan_ull) scanelf_dir("/usr/local/lib");
1361 }
1362
1363 /* scan env PATH for paths */
1364 static void scanelf_envpath()
1365 {
1366 char *path, *p;
1367
1368 path = getenv("PATH");
1369 if (!path)
1370 err("PATH is not set in your env !");
1371 path = xstrdup(path);
1372
1373 while ((p = strrchr(path, ':')) != NULL) {
1374 scanelf_dir(p + 1);
1375 *p = 0;
1376 }
1377
1378 free(path);
1379 }
1380
1381 /* usage / invocation handling functions */
1382 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1383 #define a_argument required_argument
1384 static struct option const long_opts[] = {
1385 {"path", no_argument, NULL, 'p'},
1386 {"ldpath", no_argument, NULL, 'l'},
1387 {"recursive", no_argument, NULL, 'R'},
1388 {"mount", no_argument, NULL, 'm'},
1389 {"symlink", no_argument, NULL, 'y'},
1390 {"archives", no_argument, NULL, 'A'},
1391 {"ldcache", no_argument, NULL, 'L'},
1392 {"fix", no_argument, NULL, 'X'},
1393 {"setpax", a_argument, NULL, 'z'},
1394 {"pax", no_argument, NULL, 'x'},
1395 {"header", no_argument, NULL, 'e'},
1396 {"textrel", no_argument, NULL, 't'},
1397 {"rpath", no_argument, NULL, 'r'},
1398 {"needed", no_argument, NULL, 'n'},
1399 {"interp", no_argument, NULL, 'i'},
1400 {"bind", no_argument, NULL, 'b'},
1401 {"soname", no_argument, NULL, 'S'},
1402 {"symbol", a_argument, NULL, 's'},
1403 {"section", a_argument, NULL, 'k'},
1404 {"lib", a_argument, NULL, 'N'},
1405 {"gmatch", no_argument, NULL, 'g'},
1406 {"textrels", no_argument, NULL, 'T'},
1407 {"etype", a_argument, NULL, 'E'},
1408 {"bits", a_argument, NULL, 'M'},
1409 {"all", no_argument, NULL, 'a'},
1410 {"quiet", no_argument, NULL, 'q'},
1411 {"verbose", no_argument, NULL, 'v'},
1412 {"format", a_argument, NULL, 'F'},
1413 {"from", a_argument, NULL, 'f'},
1414 {"file", a_argument, NULL, 'o'},
1415 {"nobanner", no_argument, NULL, 'B'},
1416 {"help", no_argument, NULL, 'h'},
1417 {"version", no_argument, NULL, 'V'},
1418 {NULL, no_argument, NULL, 0x0}
1419 };
1420
1421 static const char *opts_help[] = {
1422 "Scan all directories in PATH environment",
1423 "Scan all directories in /etc/ld.so.conf",
1424 "Scan directories recursively",
1425 "Don't recursively cross mount points",
1426 "Don't scan symlinks",
1427 "Scan archives (.a files)",
1428 "Utilize ld.so.cache information (use with -r/-n)",
1429 "Try and 'fix' bad things (use with -r/-e)",
1430 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1431 "Print PaX markings",
1432 "Print GNU_STACK/PT_LOAD markings",
1433 "Print TEXTREL information",
1434 "Print RPATH information",
1435 "Print NEEDED information",
1436 "Print INTERP information",
1437 "Print BIND information",
1438 "Print SONAME information",
1439 "Find a specified symbol",
1440 "Find a specified section",
1441 "Find a specified library",
1442 "Use strncmp to match libraries. (use with -N)",
1443 "Locate cause of TEXTREL",
1444 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1445 "Print only ELF files matching numeric bits",
1446 "Print all scanned info (-x -e -t -r -b)\n",
1447 "Only output 'bad' things",
1448 "Be verbose (can be specified more than once)",
1449 "Use specified format for output",
1450 "Read input stream from a filename",
1451 "Write output stream to a filename",
1452 "Don't display the header",
1453 "Print this help and exit",
1454 "Print version and exit",
1455 NULL
1456 };
1457
1458 /* display usage and exit */
1459 static void usage(int status)
1460 {
1461 unsigned long i;
1462 printf("* Scan ELF binaries for stuff\n\n"
1463 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1464 printf("Options: -[%s]\n", PARSE_FLAGS);
1465 for (i = 0; long_opts[i].name; ++i)
1466 if (long_opts[i].has_arg == no_argument)
1467 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1468 long_opts[i].name, opts_help[i]);
1469 else
1470 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1471 long_opts[i].name, opts_help[i]);
1472
1473 if (status != EXIT_SUCCESS)
1474 exit(status);
1475
1476 puts("\nThe format modifiers for the -F option are:");
1477 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1478 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1479 puts(" i INTERP \tb BIND \ts symbol");
1480 puts(" N library \to Type \tT TEXTRELs");
1481 puts(" S SONAME \tk section");
1482 puts(" p filename (with search path removed)");
1483 puts(" f filename (short name/basename)");
1484 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1485
1486 puts("\nELF Etypes:");
1487 print_etypes(stdout);
1488
1489 exit(status);
1490 }
1491
1492 /* parse command line arguments and preform needed actions */
1493 static void parseargs(int argc, char *argv[])
1494 {
1495 int i;
1496 const char *from_file = NULL;
1497
1498 opterr = 0;
1499 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1500 switch (i) {
1501
1502 case 'V':
1503 printf("pax-utils-%s: %s compiled %s\n%s\n"
1504 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1505 VERSION, __FILE__, __DATE__, rcsid, argv0);
1506 exit(EXIT_SUCCESS);
1507 break;
1508 case 'h': usage(EXIT_SUCCESS); break;
1509 case 'f':
1510 if (from_file) warn("You prob don't want to specify -f twice");
1511 from_file = optarg;
1512 break;
1513 case 'E':
1514 strncpy(match_etypes, optarg, sizeof(match_etypes));
1515 break;
1516 case 'M':
1517 match_bits = atoi(optarg);
1518 break;
1519 case 'o': {
1520 FILE *fp = NULL;
1521 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1522 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1523 SET_STDOUT(fp);
1524 break;
1525 }
1526 case 'k':
1527 if (find_section) warn("You prob don't want to specify -k twice");
1528 find_section = optarg;
1529 break;
1530 case 's': {
1531 if (find_sym) warn("You prob don't want to specify -s twice");
1532 find_sym = optarg;
1533 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1534 sprintf(versioned_symname, "%s@", find_sym);
1535 break;
1536 }
1537 case 'N': {
1538 if (find_lib) warn("You prob don't want to specify -N twice");
1539 find_lib = optarg;
1540 break;
1541 }
1542
1543 case 'F': {
1544 if (out_format) warn("You prob don't want to specify -F twice");
1545 out_format = optarg;
1546 break;
1547 }
1548 case 'z': {
1549 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1550 size_t x;
1551
1552 for (x = 0 ; x < strlen(optarg); x++) {
1553 switch(optarg[x]) {
1554 case 'p':
1555 case 'P':
1556 do_state(optarg[x], PAGEEXEC);
1557 break;
1558 case 's':
1559 case 'S':
1560 do_state(optarg[x], SEGMEXEC);
1561 break;
1562 case 'm':
1563 case 'M':
1564 do_state(optarg[x], MPROTECT);
1565 break;
1566 case 'e':
1567 case 'E':
1568 do_state(optarg[x], EMUTRAMP);
1569 break;
1570 case 'r':
1571 case 'R':
1572 do_state(optarg[x], RANDMMAP);
1573 break;
1574 case 'x':
1575 case 'X':
1576 do_state(optarg[x], RANDEXEC);
1577 break;
1578 default:
1579 break;
1580 }
1581 }
1582 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1583 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1584 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1585 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1586 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1587 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1588 setpax = flags;
1589 break;
1590 }
1591 case 'g': gmatch = 1; break;
1592 case 'L': use_ldcache = 1; break;
1593 case 'y': scan_symlink = 0; break;
1594 case 'A': scan_archives = 1; break;
1595 case 'B': show_banner = 0; break;
1596 case 'l': scan_ldpath = 1; break;
1597 case 'p': scan_envpath = 1; break;
1598 case 'R': dir_recurse = 1; break;
1599 case 'm': dir_crossmount = 0; break;
1600 case 'X': ++fix_elf; break;
1601 case 'x': show_pax = 1; break;
1602 case 'e': show_phdr = 1; break;
1603 case 't': show_textrel = 1; break;
1604 case 'r': show_rpath = 1; break;
1605 case 'n': show_needed = 1; break;
1606 case 'i': show_interp = 1; break;
1607 case 'b': show_bind = 1; break;
1608 case 'S': show_soname = 1; break;
1609 case 'T': show_textrels = 1; break;
1610 case 'q': be_quiet = 1; break;
1611 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1612 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1613
1614 case ':':
1615 err("Option '%c' is missing parameter", optopt);
1616 case '?':
1617 err("Unknown option '%c' or argument missing", optopt);
1618 default:
1619 err("Unhandled option '%c'; please report this", i);
1620 }
1621 }
1622
1623 /* let the format option override all other options */
1624 if (out_format) {
1625 show_pax = show_phdr = show_textrel = show_rpath = \
1626 show_needed = show_interp = show_bind = show_soname = \
1627 show_textrels = 0;
1628 for (i = 0; out_format[i]; ++i) {
1629 if (!IS_MODIFIER(out_format[i])) continue;
1630
1631 switch (out_format[++i]) {
1632 case '+': break;
1633 case '%': break;
1634 case '#': break;
1635 case 'F': break;
1636 case 'p': break;
1637 case 'f': break;
1638 case 'k': break;
1639 case 's': break;
1640 case 'N': break;
1641 case 'o': break;
1642 case 'x': show_pax = 1; break;
1643 case 'e': show_phdr = 1; break;
1644 case 't': show_textrel = 1; break;
1645 case 'r': show_rpath = 1; break;
1646 case 'n': show_needed = 1; break;
1647 case 'i': show_interp = 1; break;
1648 case 'b': show_bind = 1; break;
1649 case 'S': show_soname = 1; break;
1650 case 'T': show_textrels = 1; break;
1651 default:
1652 err("Invalid format specifier '%c' (byte %i)",
1653 out_format[i], i+1);
1654 }
1655 }
1656
1657 /* construct our default format */
1658 } else {
1659 size_t fmt_len = 30;
1660 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1661 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1662 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1663 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1664 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1665 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1666 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1667 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1668 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1669 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1670 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1671 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1672 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1673 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1674 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1675 }
1676 if (be_verbose > 2) printf("Format: %s\n", out_format);
1677
1678 /* now lets actually do the scanning */
1679 if (scan_ldpath || use_ldcache)
1680 load_ld_so_conf(0, "/etc/ld.so.conf");
1681 if (scan_ldpath) scanelf_ldpath();
1682 if (scan_envpath) scanelf_envpath();
1683 if (!from_file && ttyname(0) == NULL)
1684 from_file = "-";
1685 if (from_file) {
1686 scanelf_from_file(from_file);
1687 from_file = *argv;
1688 }
1689 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1690 err("Nothing to scan !?");
1691 while (optind < argc) {
1692 search_path = argv[optind++];
1693 scanelf_dir(search_path);
1694 }
1695
1696 /* clean up */
1697 if (versioned_symname) free(versioned_symname);
1698 for (i = 0; ldpaths[i]; ++i)
1699 free(ldpaths[i]);
1700
1701 if (ldcache != 0)
1702 munmap(ldcache, ldcache_size);
1703 }
1704
1705
1706
1707 /* utility funcs */
1708 static char *xstrdup(const char *s)
1709 {
1710 char *ret = strdup(s);
1711 if (!ret) err("Could not strdup(): %s", strerror(errno));
1712 return ret;
1713 }
1714 static void *xmalloc(size_t size)
1715 {
1716 void *ret = malloc(size);
1717 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1718 return ret;
1719 }
1720 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1721 {
1722 size_t new_len;
1723
1724 new_len = strlen(*dst) + strlen(src);
1725 if (*curr_len <= new_len) {
1726 *curr_len = new_len + (*curr_len / 2);
1727 *dst = realloc(*dst, *curr_len);
1728 if (!*dst)
1729 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1730 }
1731
1732 if (n)
1733 strncat(*dst, src, n);
1734 else
1735 strcat(*dst, src);
1736 }
1737 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1738 {
1739 static char my_app[2];
1740 my_app[0] = append;
1741 my_app[1] = '\0';
1742 xstrcat(dst, my_app, curr_len);
1743 }
1744
1745
1746
1747 int main(int argc, char *argv[])
1748 {
1749 if (argc < 2)
1750 usage(EXIT_FAILURE);
1751 parseargs(argc, argv);
1752 fclose(stdout);
1753 #ifdef __BOUNDS_CHECKING_ON
1754 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1755 #endif
1756 return EXIT_SUCCESS;
1757 }

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