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Revision 1.128 - (show annotations) (download) (as text)
Fri Feb 17 15:36:16 2006 UTC (8 years, 7 months ago) by solar
Branch: MAIN
Changes since 1.127: +11 -8 lines
File MIME type: text/x-csrc
- finished up ei_pax handling

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 1.127 2006/02/17 07:13:54 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
12 static const char *rcsid = "$Id: scanelf.c,v 1.127 2006/02/17 07:13:54 solar Exp $";
13 #define argv0 "scanelf"
14
15 #define IS_MODIFIER(c) (c == '%' || c == '#')
16
17
18
19 /* prototypes */
20 static int scanelf_elfobj(elfobj *elf);
21 static int scanelf_elf(const char *filename, int fd, size_t len);
22 static int scanelf_archive(const char *filename, int fd, size_t len);
23 static void scanelf_file(const char *filename);
24 static void scanelf_dir(const char *path);
25 static void scanelf_ldpath(void);
26 static void scanelf_envpath(void);
27 static void usage(int status);
28 static void parseargs(int argc, char *argv[]);
29 static char *xstrdup(const char *s);
30 static void *xmalloc(size_t size);
31 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
33 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
34
35 /* variables to control behavior */
36 static char match_etypes[126] = "";
37 static char *ldpaths[256];
38 static char scan_ldpath = 0;
39 static char scan_envpath = 0;
40 static char scan_symlink = 1;
41 static char scan_archives = 0;
42 static char dir_recurse = 0;
43 static char dir_crossmount = 1;
44 static char show_pax = 0;
45 static char show_phdr = 0;
46 static char show_textrel = 0;
47 static char show_rpath = 0;
48 static char show_needed = 0;
49 static char show_interp = 0;
50 static char show_bind = 0;
51 static char show_soname = 0;
52 static char show_textrels = 0;
53 static char show_banner = 1;
54 static char be_quiet = 0;
55 static char be_verbose = 0;
56 static char be_wewy_wewy_quiet = 0;
57 static char *find_sym = NULL, *versioned_symname = NULL;
58 static char *find_lib = NULL;
59 static char *find_section = NULL;
60 static char *out_format = NULL;
61 static char *search_path = NULL;
62 static char fix_elf = 0;
63 static char gmatch = 0;
64 static char use_ldcache = 0;
65
66 int match_bits = 0;
67 caddr_t ldcache = 0;
68 size_t ldcache_size = 0;
69 unsigned long setpax = 0UL;
70
71 /* sub-funcs for scanelf_file() */
72 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73 {
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
75 #define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
78 /* debug sections */ \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
81 /* runtime sections */ \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
84 if (symtab && dynsym) { \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
86 } else { \
87 *sym = (void*)(symtab ? symtab : dynsym); \
88 } \
89 if (strtab && dynstr) { \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
91 } else { \
92 *tab = (void*)(strtab ? strtab : dynstr); \
93 } \
94 }
95 GET_SYMTABS(32)
96 GET_SYMTABS(64)
97 }
98
99 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
100 {
101 static char ret[7];
102 unsigned long i, shown;
103
104 if (!show_pax) return NULL;
105
106 shown = 0;
107 memset(&ret, 0, sizeof(ret));
108
109 if (elf->phdr) {
110 #define SHOW_PAX(B) \
111 if (elf->elf_class == ELFCLASS ## B) { \
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \
117 if (fix_elf && setpax) { \
118 /* set the paxctl flags */ \
119 ESET(phdr[i].p_flags, setpax); \
120 } \
121 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
122 continue; \
123 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
124 *found_pax = 1; \
125 ++shown; \
126 break; \
127 } \
128 }
129 SHOW_PAX(32)
130 SHOW_PAX(64)
131 }
132
133
134 if (fix_elf && setpax) {
135 /* set the chpax settings */
136 if (elf->elf_class == ELFCLASS32)
137 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
138 else
139 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
140 }
141
142 /* fall back to EI_PAX if no PT_PAX was found */
143 if (!*ret) {
144 static char *paxflags;
145 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
146 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
147 *found_pax = 1;
148 return (be_wewy_wewy_quiet ? NULL : paxflags);
149 }
150 strncpy(ret, paxflags, sizeof(ret));
151 }
152
153 if (be_wewy_wewy_quiet || (be_quiet && !shown))
154 return NULL;
155 else
156 return ret;
157 }
158
159 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
160 {
161 static char ret[12];
162 char *found;
163 unsigned long i, shown, multi_stack, multi_relro, multi_load;
164 int max_pt_load;
165
166 if (!show_phdr) return NULL;
167
168 memcpy(ret, "--- --- ---\0", 12);
169
170 shown = 0;
171 multi_stack = multi_relro = multi_load = 0;
172 max_pt_load = elf_max_pt_load(elf);
173
174 #define NOTE_GNU_STACK ".note.GNU-stack"
175 #define SHOW_PHDR(B) \
176 if (elf->elf_class == ELFCLASS ## B) { \
177 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
178 Elf ## B ## _Off offset; \
179 uint32_t flags, check_flags; \
180 if (elf->phdr != NULL) { \
181 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
182 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
183 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
184 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
185 found = found_phdr; \
186 offset = 0; \
187 check_flags = PF_X; \
188 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
189 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
190 found = found_relro; \
191 offset = 4; \
192 check_flags = PF_X; \
193 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
194 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
195 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
196 found = found_load; \
197 offset = 8; \
198 check_flags = PF_W|PF_X; \
199 } else \
200 continue; \
201 flags = EGET(phdr[i].p_flags); \
202 if (be_quiet && ((flags & check_flags) != check_flags)) \
203 continue; \
204 if (fix_elf && ((flags & PF_X) != flags)) { \
205 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
206 ret[3] = ret[7] = '!'; \
207 flags = EGET(phdr[i].p_flags); \
208 } \
209 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
210 *found = 1; \
211 ++shown; \
212 } \
213 } else if (elf->shdr != NULL) { \
214 /* no program headers which means this is prob an object file */ \
215 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
216 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
217 char *str; \
218 if ((void*)strtbl > (void*)elf->data_end) \
219 goto skip_this_shdr##B; \
220 check_flags = SHF_WRITE|SHF_EXECINSTR; \
221 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
222 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
223 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
224 str = elf->data + offset; \
225 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
226 if (!strcmp(str, NOTE_GNU_STACK)) { \
227 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
228 flags = EGET(shdr[i].sh_flags); \
229 if (be_quiet && ((flags & check_flags) != check_flags)) \
230 continue; \
231 ++*found_phdr; \
232 shown = 1; \
233 if (flags & SHF_WRITE) ret[0] = 'W'; \
234 if (flags & SHF_ALLOC) ret[1] = 'A'; \
235 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
236 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
237 break; \
238 } \
239 } \
240 skip_this_shdr##B: \
241 if (!multi_stack) { \
242 *found_phdr = 1; \
243 shown = 1; \
244 memcpy(ret, "!WX", 3); \
245 } \
246 } \
247 }
248 SHOW_PHDR(32)
249 SHOW_PHDR(64)
250
251 if (be_wewy_wewy_quiet || (be_quiet && !shown))
252 return NULL;
253 else
254 return ret;
255 }
256 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
257 {
258 static const char *ret = "TEXTREL";
259 unsigned long i;
260
261 if (!show_textrel && !show_textrels) return NULL;
262
263 if (elf->phdr) {
264 #define SHOW_TEXTREL(B) \
265 if (elf->elf_class == ELFCLASS ## B) { \
266 Elf ## B ## _Dyn *dyn; \
267 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
268 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
269 Elf ## B ## _Off offset; \
270 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
271 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
272 offset = EGET(phdr[i].p_offset); \
273 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
274 dyn = DYN ## B (elf->data + offset); \
275 while (EGET(dyn->d_tag) != DT_NULL) { \
276 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
277 *found_textrel = 1; \
278 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
279 return (be_wewy_wewy_quiet ? NULL : ret); \
280 } \
281 ++dyn; \
282 } \
283 } }
284 SHOW_TEXTREL(32)
285 SHOW_TEXTREL(64)
286 }
287
288 if (be_quiet || be_wewy_wewy_quiet)
289 return NULL;
290 else
291 return " - ";
292 }
293 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
294 {
295 unsigned long s, r, rmax;
296 void *symtab_void, *strtab_void, *text_void;
297
298 if (!show_textrels) return NULL;
299
300 /* don't search for TEXTREL's if the ELF doesn't have any */
301 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
302 if (!*found_textrel) return NULL;
303
304 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
305 text_void = elf_findsecbyname(elf, ".text");
306
307 if (symtab_void && strtab_void && text_void && elf->shdr) {
308 #define SHOW_TEXTRELS(B) \
309 if (elf->elf_class == ELFCLASS ## B) { \
310 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
311 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
312 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
313 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
314 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
315 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
316 uint ## B ## _t memsz = EGET(text->sh_size); \
317 Elf ## B ## _Rel *rel; \
318 Elf ## B ## _Rela *rela; \
319 /* search the section headers for relocations */ \
320 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
321 uint32_t sh_type = EGET(shdr[s].sh_type); \
322 if (sh_type == SHT_REL) { \
323 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
324 rela = NULL; \
325 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
326 } else if (sh_type == SHT_RELA) { \
327 rel = NULL; \
328 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
329 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
330 } else \
331 continue; \
332 /* now see if any of the relocs are in the .text */ \
333 for (r = 0; r < rmax; ++r) { \
334 unsigned long sym_max; \
335 Elf ## B ## _Addr offset_tmp; \
336 Elf ## B ## _Sym *func; \
337 Elf ## B ## _Sym *sym; \
338 Elf ## B ## _Addr r_offset; \
339 uint ## B ## _t r_info; \
340 if (sh_type == SHT_REL) { \
341 r_offset = EGET(rel[r].r_offset); \
342 r_info = EGET(rel[r].r_info); \
343 } else { \
344 r_offset = EGET(rela[r].r_offset); \
345 r_info = EGET(rela[r].r_info); \
346 } \
347 /* make sure this relocation is inside of the .text */ \
348 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
349 if (be_verbose <= 2) continue; \
350 } else \
351 *found_textrels = 1; \
352 /* locate this relocation symbol name */ \
353 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
354 if ((void*)sym > (void*)elf->data_end) { \
355 warn("%s: corrupt ELF symbol", elf->filename); \
356 continue; \
357 } \
358 sym_max = ELF ## B ## _R_SYM(r_info); \
359 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
360 sym += sym_max; \
361 else \
362 sym = NULL; \
363 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
364 /* show the raw details about this reloc */ \
365 printf(" %s: ", elf->base_filename); \
366 if (sym && sym->st_name) \
367 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
368 else \
369 printf("(memory/fake?)"); \
370 printf(" [0x%lX]", (unsigned long)r_offset); \
371 /* now try to find the closest symbol that this rel is probably in */ \
372 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
373 func = NULL; \
374 offset_tmp = 0; \
375 while (sym_max--) { \
376 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
377 func = sym; \
378 offset_tmp = EGET(sym->st_value); \
379 } \
380 ++sym; \
381 } \
382 printf(" in "); \
383 if (func && func->st_name) \
384 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
385 else \
386 printf("(NULL: fake?)"); \
387 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
388 } \
389 } }
390 SHOW_TEXTRELS(32)
391 SHOW_TEXTRELS(64)
392 }
393 if (!*found_textrels)
394 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
395
396 return NULL;
397 }
398
399 static void rpath_security_checks(elfobj *, char *, const char *);
400 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
401 {
402 struct stat st;
403 switch (*item) {
404 case '/': break;
405 case '.':
406 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
407 break;
408 case ':':
409 case '\0':
410 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
411 break;
412 case '$':
413 if (fstat(elf->fd, &st) != -1)
414 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
415 warnf("Security problem with %s='%s' in %s with mode set of %o",
416 dt_type, item, elf->filename, st.st_mode & 07777);
417 break;
418 default:
419 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
420 break;
421 }
422 }
423 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
424 {
425 unsigned long i, s;
426 char *rpath, *runpath, **r;
427 void *strtbl_void;
428
429 if (!show_rpath) return;
430
431 strtbl_void = elf_findsecbyname(elf, ".dynstr");
432 rpath = runpath = NULL;
433
434 if (elf->phdr && strtbl_void) {
435 #define SHOW_RPATH(B) \
436 if (elf->elf_class == ELFCLASS ## B) { \
437 Elf ## B ## _Dyn *dyn; \
438 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
439 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
440 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
441 Elf ## B ## _Off offset; \
442 Elf ## B ## _Xword word; \
443 /* Scan all the program headers */ \
444 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
445 /* Just scan dynamic headers */ \
446 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
447 offset = EGET(phdr[i].p_offset); \
448 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
449 /* Just scan dynamic RPATH/RUNPATH headers */ \
450 dyn = DYN ## B (elf->data + offset); \
451 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
452 if (word == DT_RPATH) { \
453 r = &rpath; \
454 } else if (word == DT_RUNPATH) { \
455 r = &runpath; \
456 } else { \
457 ++dyn; \
458 continue; \
459 } \
460 /* Verify the memory is somewhat sane */ \
461 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
462 if (offset < (Elf ## B ## _Off)elf->len) { \
463 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
464 *r = (char*)(elf->data + offset); \
465 /* cache the length in case we need to nuke this section later on */ \
466 if (fix_elf) \
467 offset = strlen(*r); \
468 /* If quiet, don't output paths in ld.so.conf */ \
469 if (be_quiet) { \
470 size_t len; \
471 char *start, *end; \
472 /* note that we only 'chop' off leading known paths. */ \
473 /* since *r is read-only memory, we can only move the ptr forward. */ \
474 start = *r; \
475 /* scan each path in : delimited list */ \
476 while (start) { \
477 rpath_security_checks(elf, start, get_elfdtype(word)); \
478 end = strchr(start, ':'); \
479 len = (end ? abs(end - start) : strlen(start)); \
480 if (use_ldcache) \
481 for (s = 0; ldpaths[s]; ++s) \
482 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
483 *r = end; \
484 /* corner case ... if RPATH reads "/usr/lib:", we want \
485 * to show ':' rather than '' */ \
486 if (end && end[1] != '\0') \
487 (*r)++; \
488 break; \
489 } \
490 if (!*r || !end) \
491 break; \
492 else \
493 start = start + len + 1; \
494 } \
495 } \
496 if (*r) { \
497 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
498 /* just nuke it */ \
499 nuke_it##B: \
500 memset(*r, 0x00, offset); \
501 *r = NULL; \
502 ESET(dyn->d_tag, DT_DEBUG); \
503 ESET(dyn->d_un.d_ptr, 0); \
504 } else if (fix_elf) { \
505 /* try to clean "bad" paths */ \
506 size_t len, tmpdir_len; \
507 char *start, *end; \
508 const char *tmpdir; \
509 start = *r; \
510 tmpdir = (getenv("TMPDIR") ? : "."); \
511 tmpdir_len = strlen(tmpdir); \
512 while (1) { \
513 end = strchr(start, ':'); \
514 if (start == end) { \
515 eat_this_path##B: \
516 len = strlen(end); \
517 memmove(start, end+1, len); \
518 start[len-1] = '\0'; \
519 end = start - 1; \
520 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
521 if (!end) { \
522 if (start == *r) \
523 goto nuke_it##B; \
524 *--start = '\0'; \
525 } else \
526 goto eat_this_path##B; \
527 } \
528 if (!end) \
529 break; \
530 start = end + 1; \
531 } \
532 if (**r == '\0') \
533 goto nuke_it##B; \
534 } \
535 if (*r) \
536 *found_rpath = 1; \
537 } \
538 } \
539 ++dyn; \
540 } \
541 } }
542 SHOW_RPATH(32)
543 SHOW_RPATH(64)
544 }
545
546 if (be_wewy_wewy_quiet) return;
547
548 if (rpath && runpath) {
549 if (!strcmp(rpath, runpath)) {
550 xstrcat(ret, runpath, ret_len);
551 } else {
552 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
553 xchrcat(ret, '{', ret_len);
554 xstrcat(ret, rpath, ret_len);
555 xchrcat(ret, ',', ret_len);
556 xstrcat(ret, runpath, ret_len);
557 xchrcat(ret, '}', ret_len);
558 }
559 } else if (rpath || runpath)
560 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
561 else if (!be_quiet)
562 xstrcat(ret, " - ", ret_len);
563 }
564
565 #define LDSO_CACHE_MAGIC "ld.so-"
566 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
567 #define LDSO_CACHE_VER "1.7.0"
568 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
569 #define FLAG_ANY -1
570 #define FLAG_TYPE_MASK 0x00ff
571 #define FLAG_LIBC4 0x0000
572 #define FLAG_ELF 0x0001
573 #define FLAG_ELF_LIBC5 0x0002
574 #define FLAG_ELF_LIBC6 0x0003
575 #define FLAG_REQUIRED_MASK 0xff00
576 #define FLAG_SPARC_LIB64 0x0100
577 #define FLAG_IA64_LIB64 0x0200
578 #define FLAG_X8664_LIB64 0x0300
579 #define FLAG_S390_LIB64 0x0400
580 #define FLAG_POWERPC_LIB64 0x0500
581 #define FLAG_MIPS64_LIBN32 0x0600
582 #define FLAG_MIPS64_LIBN64 0x0700
583
584 static char *lookup_cache_lib(elfobj *, char *);
585 static char *lookup_cache_lib(elfobj *elf, char *fname)
586 {
587 int fd = 0;
588 char *strs;
589 static char buf[__PAX_UTILS_PATH_MAX] = "";
590 const char *cachefile = "/etc/ld.so.cache";
591 struct stat st;
592
593 typedef struct {
594 char magic[LDSO_CACHE_MAGIC_LEN];
595 char version[LDSO_CACHE_VER_LEN];
596 int nlibs;
597 } header_t;
598 header_t *header;
599
600 typedef struct {
601 int flags;
602 int sooffset;
603 int liboffset;
604 } libentry_t;
605 libentry_t *libent;
606
607 if (fname == NULL)
608 return NULL;
609
610 if (ldcache == 0) {
611 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
612 return NULL;
613
614 /* cache these values so we only map/unmap the cache file once */
615 ldcache_size = st.st_size;
616 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
617
618 close(fd);
619
620 if (ldcache == (caddr_t)-1) {
621 ldcache = 0;
622 return NULL;
623 }
624
625 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
626 return NULL;
627 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
628 return NULL;
629 }
630
631 header = (header_t *) ldcache;
632 libent = (libentry_t *) (ldcache + sizeof(header_t));
633 strs = (char *) &libent[header->nlibs];
634
635 for (fd = 0; fd < header->nlibs; fd++) {
636 /* this should be more fine grained, but for now we assume that
637 * diff arches will not be cached together. and we ignore the
638 * the different multilib mips cases. */
639 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
640 continue;
641 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
642 continue;
643
644 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
645 continue;
646 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
647 }
648 return buf;
649 }
650
651
652 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
653 {
654 unsigned long i;
655 char *needed;
656 void *strtbl_void;
657 char *p;
658
659 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
660
661 strtbl_void = elf_findsecbyname(elf, ".dynstr");
662
663 if (elf->phdr && strtbl_void) {
664 #define SHOW_NEEDED(B) \
665 if (elf->elf_class == ELFCLASS ## B) { \
666 Elf ## B ## _Dyn *dyn; \
667 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
668 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
669 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
670 Elf ## B ## _Off offset; \
671 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
672 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
673 offset = EGET(phdr[i].p_offset); \
674 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
675 dyn = DYN ## B (elf->data + offset); \
676 while (EGET(dyn->d_tag) != DT_NULL) { \
677 if (EGET(dyn->d_tag) == DT_NEEDED) { \
678 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
679 if (offset >= (Elf ## B ## _Off)elf->len) { \
680 ++dyn; \
681 continue; \
682 } \
683 needed = (char*)(elf->data + offset); \
684 if (op == 0) { \
685 if (!be_wewy_wewy_quiet) { \
686 if (*found_needed) xchrcat(ret, ',', ret_len); \
687 if (use_ldcache) \
688 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
689 needed = p; \
690 xstrcat(ret, needed, ret_len); \
691 } \
692 *found_needed = 1; \
693 } else { \
694 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
695 *found_lib = 1; \
696 return (be_wewy_wewy_quiet ? NULL : needed); \
697 } \
698 } \
699 } \
700 ++dyn; \
701 } \
702 } }
703 SHOW_NEEDED(32)
704 SHOW_NEEDED(64)
705 if (op == 0 && !*found_needed && be_verbose)
706 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
707 }
708
709 return NULL;
710 }
711 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
712 {
713 void *strtbl_void;
714
715 if (!show_interp) return NULL;
716
717 strtbl_void = elf_findsecbyname(elf, ".interp");
718
719 if (strtbl_void) {
720 #define SHOW_INTERP(B) \
721 if (elf->elf_class == ELFCLASS ## B) { \
722 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
723 *found_interp = 1; \
724 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
725 }
726 SHOW_INTERP(32)
727 SHOW_INTERP(64)
728 }
729 return NULL;
730 }
731 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
732 {
733 unsigned long i;
734 struct stat s;
735
736 if (!show_bind) return NULL;
737 if (!elf->phdr) return NULL;
738
739 #define SHOW_BIND(B) \
740 if (elf->elf_class == ELFCLASS ## B) { \
741 Elf ## B ## _Dyn *dyn; \
742 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
743 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
744 Elf ## B ## _Off offset; \
745 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
746 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
747 offset = EGET(phdr[i].p_offset); \
748 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
749 dyn = DYN ## B (elf->data + offset); \
750 while (EGET(dyn->d_tag) != DT_NULL) { \
751 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
752 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
753 { \
754 if (be_quiet) return NULL; \
755 *found_bind = 1; \
756 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
757 } \
758 ++dyn; \
759 } \
760 } \
761 }
762 SHOW_BIND(32)
763 SHOW_BIND(64)
764
765 if (be_wewy_wewy_quiet) return NULL;
766
767 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
768 return NULL;
769 } else {
770 *found_bind = 1;
771 return (char *) "LAZY";
772 }
773 }
774 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
775 {
776 unsigned long i;
777 char *soname;
778 void *strtbl_void;
779
780 if (!show_soname) return NULL;
781
782 strtbl_void = elf_findsecbyname(elf, ".dynstr");
783
784 if (elf->phdr && strtbl_void) {
785 #define SHOW_SONAME(B) \
786 if (elf->elf_class == ELFCLASS ## B) { \
787 Elf ## B ## _Dyn *dyn; \
788 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
789 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
790 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
791 Elf ## B ## _Off offset; \
792 /* only look for soname in shared objects */ \
793 if (ehdr->e_type != ET_DYN) \
794 return NULL; \
795 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
796 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
797 offset = EGET(phdr[i].p_offset); \
798 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
799 dyn = DYN ## B (elf->data + offset); \
800 while (EGET(dyn->d_tag) != DT_NULL) { \
801 if (EGET(dyn->d_tag) == DT_SONAME) { \
802 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
803 if (offset >= (Elf ## B ## _Off)elf->len) { \
804 ++dyn; \
805 continue; \
806 } \
807 soname = (char*)(elf->data + offset); \
808 *found_soname = 1; \
809 return (be_wewy_wewy_quiet ? NULL : soname); \
810 } \
811 ++dyn; \
812 } \
813 } }
814 SHOW_SONAME(32)
815 SHOW_SONAME(64)
816 }
817
818 return NULL;
819 }
820 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
821 {
822 unsigned long i;
823 char *ret;
824 void *symtab_void, *strtab_void;
825
826 if (!find_sym) return NULL;
827 ret = find_sym;
828
829 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
830
831 if (symtab_void && strtab_void) {
832 #define FIND_SYM(B) \
833 if (elf->elf_class == ELFCLASS ## B) { \
834 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
835 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
836 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
837 unsigned long cnt = EGET(symtab->sh_entsize); \
838 char *symname; \
839 if (cnt) \
840 cnt = EGET(symtab->sh_size) / cnt; \
841 for (i = 0; i < cnt; ++i) { \
842 if (sym->st_name) { \
843 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
844 if ((void*)symname > (void*)elf->data_end) { \
845 warnf("%s: corrupt ELF symbols", elf->filename); \
846 continue; \
847 } \
848 if (*find_sym == '*') { \
849 printf("%s(%s) %5lX %15s %s\n", \
850 ((*found_sym == 0) ? "\n\t" : "\t"), \
851 elf->base_filename, \
852 (unsigned long)sym->st_size, \
853 get_elfstttype(sym->st_info), \
854 symname); \
855 *found_sym = 1; \
856 } else { \
857 char *this_sym, *next_sym; \
858 this_sym = find_sym; \
859 do { \
860 next_sym = strchr(this_sym, ','); \
861 if (next_sym == NULL) \
862 next_sym = this_sym + strlen(this_sym); \
863 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
864 (strcmp(symname, versioned_symname) == 0)) { \
865 ret = this_sym; \
866 (*found_sym)++; \
867 goto break_out; \
868 } \
869 this_sym = next_sym + 1; \
870 } while (*next_sym != '\0'); \
871 } \
872 } \
873 ++sym; \
874 } }
875 FIND_SYM(32)
876 FIND_SYM(64)
877 }
878
879 break_out:
880 if (be_wewy_wewy_quiet) return NULL;
881
882 if (*find_sym != '*' && *found_sym)
883 return ret;
884 if (be_quiet)
885 return NULL;
886 else
887 return (char *)" - ";
888 }
889
890
891 static char *scanelf_file_sections(elfobj *elf, char *found_section)
892 {
893 if (!find_section)
894 return NULL;
895
896 #define FIND_SECTION(B) \
897 if (elf->elf_class == ELFCLASS ## B) { \
898 Elf ## B ## _Shdr *section; \
899 section = SHDR ## B (elf_findsecbyname(elf, find_section)); \
900 if (section != NULL) \
901 *found_section = 1; \
902 }
903 FIND_SECTION(32)
904 FIND_SECTION(64)
905
906
907 if (be_wewy_wewy_quiet) return NULL;
908
909 if (*found_section)
910 return find_section;
911
912 if (be_quiet)
913 return NULL;
914 else
915 return (char *)" - ";
916 }
917
918 /* scan an elf file and show all the fun stuff */
919 #define prints(str) write(fileno(stdout), str, strlen(str))
920 static int scanelf_elfobj(elfobj *elf)
921 {
922 unsigned long i;
923 char found_pax, found_phdr, found_relro, found_load, found_textrel,
924 found_rpath, found_needed, found_interp, found_bind, found_soname,
925 found_sym, found_lib, found_file, found_textrels, found_section;
926 static char *out_buffer = NULL;
927 static size_t out_len;
928
929 found_pax = found_phdr = found_relro = found_load = found_textrel = \
930 found_rpath = found_needed = found_interp = found_bind = found_soname = \
931 found_sym = found_lib = found_file = found_textrels = found_section = 0;
932
933 if (be_verbose > 2)
934 printf("%s: scanning file {%s,%s}\n", elf->filename,
935 get_elfeitype(EI_CLASS, elf->elf_class),
936 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
937 else if (be_verbose > 1)
938 printf("%s: scanning file\n", elf->filename);
939
940 /* init output buffer */
941 if (!out_buffer) {
942 out_len = sizeof(char) * 80;
943 out_buffer = (char*)xmalloc(out_len);
944 }
945 *out_buffer = '\0';
946
947 /* show the header */
948 if (!be_quiet && show_banner) {
949 for (i = 0; out_format[i]; ++i) {
950 if (!IS_MODIFIER(out_format[i])) continue;
951
952 switch (out_format[++i]) {
953 case '%': break;
954 case '#': break;
955 case 'F':
956 case 'p':
957 case 'f': prints("FILE "); found_file = 1; break;
958 case 'o': prints(" TYPE "); break;
959 case 'x': prints(" PAX "); break;
960 case 'e': prints("STK/REL/PTL "); break;
961 case 't': prints("TEXTREL "); break;
962 case 'r': prints("RPATH "); break;
963 case 'n': prints("NEEDED "); break;
964 case 'i': prints("INTERP "); break;
965 case 'b': prints("BIND "); break;
966 case 'S': prints("SONAME "); break;
967 case 's': prints("SYM "); break;
968 case 'N': prints("LIB "); break;
969 case 'T': prints("TEXTRELS "); break;
970 case 'k': prints("SECTION "); break;
971 default: warnf("'%c' has no title ?", out_format[i]);
972 }
973 }
974 if (!found_file) prints("FILE ");
975 prints("\n");
976 found_file = 0;
977 show_banner = 0;
978 }
979
980 /* dump all the good stuff */
981 for (i = 0; out_format[i]; ++i) {
982 const char *out;
983 const char *tmp;
984
985 if (!IS_MODIFIER(out_format[i])) {
986 xchrcat(&out_buffer, out_format[i], &out_len);
987 continue;
988 }
989
990 out = NULL;
991 be_wewy_wewy_quiet = (out_format[i] == '#');
992 switch (out_format[++i]) {
993 case '%':
994 case '#':
995 xchrcat(&out_buffer, out_format[i], &out_len); break;
996 case 'F':
997 found_file = 1;
998 if (be_wewy_wewy_quiet) break;
999 xstrcat(&out_buffer, elf->filename, &out_len);
1000 break;
1001 case 'p':
1002 found_file = 1;
1003 if (be_wewy_wewy_quiet) break;
1004 tmp = elf->filename;
1005 if (search_path) {
1006 ssize_t len_search = strlen(search_path);
1007 ssize_t len_file = strlen(elf->filename);
1008 if (!strncmp(elf->filename, search_path, len_search) && \
1009 len_file > len_search)
1010 tmp += len_search;
1011 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1012 }
1013 xstrcat(&out_buffer, tmp, &out_len);
1014 break;
1015 case 'f':
1016 found_file = 1;
1017 if (be_wewy_wewy_quiet) break;
1018 tmp = strrchr(elf->filename, '/');
1019 tmp = (tmp == NULL ? elf->filename : tmp+1);
1020 xstrcat(&out_buffer, tmp, &out_len);
1021 break;
1022 case 'o': out = get_elfetype(elf); break;
1023 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1024 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1025 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1026 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1027 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1028 case 'n':
1029 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1030 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1031 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1032 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1033 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1034 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1035 default: warnf("'%c' has no scan code?", out_format[i]);
1036 }
1037 if (out) {
1038 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1039 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1040 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1041 else
1042 xstrcat(&out_buffer, out, &out_len);
1043 }
1044 }
1045
1046 #define FOUND_SOMETHING() \
1047 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1048 found_rpath || found_needed || found_interp || found_bind || \
1049 found_soname || found_sym || found_lib || found_textrels || found_section )
1050
1051 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1052 xchrcat(&out_buffer, ' ', &out_len);
1053 xstrcat(&out_buffer, elf->filename, &out_len);
1054 }
1055 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1056 puts(out_buffer);
1057 fflush(stdout);
1058 }
1059
1060 return 0;
1061 }
1062
1063 /* scan a single elf */
1064 static int scanelf_elf(const char *filename, int fd, size_t len)
1065 {
1066 int ret = 1;
1067 elfobj *elf;
1068
1069 /* verify this is real ELF */
1070 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1071 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1072 return ret;
1073 }
1074 switch (match_bits) {
1075 case 32:
1076 if (elf->elf_class != ELFCLASS32)
1077 goto label_done;
1078 break;
1079 case 64:
1080 if (elf->elf_class != ELFCLASS64)
1081 goto label_done;
1082 break;
1083 default: break;
1084 }
1085 if (strlen(match_etypes)) {
1086 char sbuf[126];
1087 strncpy(sbuf, match_etypes, sizeof(sbuf));
1088 if (strchr(match_etypes, ',') != NULL) {
1089 char *p;
1090 while((p = strrchr(sbuf, ',')) != NULL) {
1091 *p = 0;
1092 if (atoi(p+1) == get_etype(elf))
1093 goto label_ret;
1094 }
1095 }
1096 if (atoi(sbuf) != get_etype(elf))
1097 goto label_done;
1098 }
1099
1100 label_ret:
1101 ret = scanelf_elfobj(elf);
1102
1103 label_done:
1104 unreadelf(elf);
1105 return ret;
1106 }
1107
1108 /* scan an archive of elfs */
1109 static int scanelf_archive(const char *filename, int fd, size_t len)
1110 {
1111 archive_handle *ar;
1112 archive_member *m;
1113 char *ar_buffer;
1114 elfobj *elf;
1115
1116 ar = ar_open_fd(filename, fd);
1117 if (ar == NULL)
1118 return 1;
1119
1120 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1121 while ((m=ar_next(ar)) != NULL) {
1122 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1123 if (elf) {
1124 scanelf_elfobj(elf);
1125 unreadelf(elf);
1126 }
1127 }
1128 munmap(ar_buffer, len);
1129
1130 return 0;
1131 }
1132 /* scan a file which may be an elf or an archive or some other magical beast */
1133 static void scanelf_file(const char *filename)
1134 {
1135 struct stat st;
1136 int fd;
1137
1138 /* make sure 'filename' exists */
1139 if (lstat(filename, &st) == -1) {
1140 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1141 return;
1142 }
1143
1144 /* always handle regular files and handle symlinked files if no -y */
1145 if (S_ISLNK(st.st_mode)) {
1146 if (!scan_symlink) return;
1147 stat(filename, &st);
1148 }
1149 if (!S_ISREG(st.st_mode)) {
1150 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1151 return;
1152 }
1153
1154 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1155 return;
1156
1157 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1158 /* if it isn't an ELF, maybe it's an .a archive */
1159 scanelf_archive(filename, fd, st.st_size);
1160
1161 close(fd);
1162 }
1163
1164 /* scan a directory for ET_EXEC files and print when we find one */
1165 static void scanelf_dir(const char *path)
1166 {
1167 register DIR *dir;
1168 register struct dirent *dentry;
1169 struct stat st_top, st;
1170 char buf[__PAX_UTILS_PATH_MAX];
1171 size_t pathlen = 0, len = 0;
1172
1173 /* make sure path exists */
1174 if (lstat(path, &st_top) == -1) {
1175 if (be_verbose > 2) printf("%s: does not exist\n", path);
1176 return;
1177 }
1178
1179 /* ok, if it isn't a directory, assume we can open it */
1180 if (!S_ISDIR(st_top.st_mode)) {
1181 scanelf_file(path);
1182 return;
1183 }
1184
1185 /* now scan the dir looking for fun stuff */
1186 if ((dir = opendir(path)) == NULL) {
1187 warnf("could not opendir %s: %s", path, strerror(errno));
1188 return;
1189 }
1190 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1191
1192 pathlen = strlen(path);
1193 while ((dentry = readdir(dir))) {
1194 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1195 continue;
1196 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1197 if (len >= sizeof(buf)) {
1198 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1199 (unsigned long)len, (unsigned long)sizeof(buf));
1200 continue;
1201 }
1202 sprintf(buf, "%s/%s", path, dentry->d_name);
1203 if (lstat(buf, &st) != -1) {
1204 if (S_ISREG(st.st_mode))
1205 scanelf_file(buf);
1206 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1207 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1208 scanelf_dir(buf);
1209 }
1210 }
1211 }
1212 closedir(dir);
1213 }
1214
1215 static int scanelf_from_file(char *filename)
1216 {
1217 FILE *fp = NULL;
1218 char *p;
1219 char path[__PAX_UTILS_PATH_MAX];
1220
1221 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1222 fp = stdin;
1223 else if ((fp = fopen(filename, "r")) == NULL)
1224 return 1;
1225
1226 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1227 if ((p = strchr(path, '\n')) != NULL)
1228 *p = 0;
1229 search_path = path;
1230 scanelf_dir(path);
1231 }
1232 if (fp != stdin)
1233 fclose(fp);
1234 return 0;
1235 }
1236
1237 static int load_ld_so_conf(int i, const char *fname)
1238 {
1239 FILE *fp = NULL;
1240 char *p;
1241 char path[__PAX_UTILS_PATH_MAX];
1242
1243 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1244 return i;
1245
1246 if ((fp = fopen(fname, "r")) == NULL)
1247 return i;
1248
1249 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1250 if ((p = strrchr(path, '\r')) != NULL)
1251 *p = 0;
1252 if ((p = strchr(path, '\n')) != NULL)
1253 *p = 0;
1254 #ifdef HAVE_GLOB
1255 // recursive includes of the same file will make this segfault.
1256 if ((*path == 'i') && (strncmp(path, "include", 7) == 0) && isblank(path[7])) {
1257 glob64_t gl;
1258 size_t x;
1259 char gpath[__PAX_UTILS_PATH_MAX];
1260
1261 gpath[sizeof(gpath)] = 0;
1262
1263 if (path[8] != '/')
1264 snprintf(gpath, sizeof(gpath)-1, "/etc/%s", &path[8]);
1265 else
1266 strncpy(gpath, &path[8], sizeof(gpath)-1);
1267
1268 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1269 for (x = 0; x < gl.gl_pathc; ++x) {
1270 /* try to avoid direct loops */
1271 if (strcmp(gl.gl_pathv[x], fname) == 0)
1272 continue;
1273 i = load_ld_so_conf(i, gl.gl_pathv[x]);
1274 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1275 globfree64(&gl);
1276 return i;
1277 }
1278 }
1279 globfree64 (&gl);
1280 continue;
1281 } else
1282 abort();
1283 }
1284 #endif
1285 if (*path != '/')
1286 continue;
1287
1288 ldpaths[i++] = xstrdup(path);
1289
1290 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1291 break;
1292 }
1293 ldpaths[i] = NULL;
1294
1295 fclose(fp);
1296 return i;
1297 }
1298
1299 /* scan /etc/ld.so.conf for paths */
1300 static void scanelf_ldpath()
1301 {
1302 char scan_l, scan_ul, scan_ull;
1303 int i = 0;
1304
1305 if (!ldpaths[0])
1306 err("Unable to load any paths from ld.so.conf");
1307
1308 scan_l = scan_ul = scan_ull = 0;
1309
1310 while (ldpaths[i]) {
1311 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1312 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1313 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1314 scanelf_dir(ldpaths[i]);
1315 ++i;
1316 }
1317
1318 if (!scan_l) scanelf_dir("/lib");
1319 if (!scan_ul) scanelf_dir("/usr/lib");
1320 if (!scan_ull) scanelf_dir("/usr/local/lib");
1321 }
1322
1323 /* scan env PATH for paths */
1324 static void scanelf_envpath()
1325 {
1326 char *path, *p;
1327
1328 path = getenv("PATH");
1329 if (!path)
1330 err("PATH is not set in your env !");
1331 path = xstrdup(path);
1332
1333 while ((p = strrchr(path, ':')) != NULL) {
1334 scanelf_dir(p + 1);
1335 *p = 0;
1336 }
1337
1338 free(path);
1339 }
1340
1341 /* usage / invocation handling functions */
1342 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1343 #define a_argument required_argument
1344 static struct option const long_opts[] = {
1345 {"path", no_argument, NULL, 'p'},
1346 {"ldpath", no_argument, NULL, 'l'},
1347 {"recursive", no_argument, NULL, 'R'},
1348 {"mount", no_argument, NULL, 'm'},
1349 {"symlink", no_argument, NULL, 'y'},
1350 {"archives", no_argument, NULL, 'A'},
1351 {"ldcache", no_argument, NULL, 'L'},
1352 {"fix", no_argument, NULL, 'X'},
1353 {"setpax", a_argument, NULL, 'z'},
1354 {"pax", no_argument, NULL, 'x'},
1355 {"header", no_argument, NULL, 'e'},
1356 {"textrel", no_argument, NULL, 't'},
1357 {"rpath", no_argument, NULL, 'r'},
1358 {"needed", no_argument, NULL, 'n'},
1359 {"interp", no_argument, NULL, 'i'},
1360 {"bind", no_argument, NULL, 'b'},
1361 {"soname", no_argument, NULL, 'S'},
1362 {"symbol", a_argument, NULL, 's'},
1363 {"section", a_argument, NULL, 'k'},
1364 {"lib", a_argument, NULL, 'N'},
1365 {"gmatch", no_argument, NULL, 'g'},
1366 {"textrels", no_argument, NULL, 'T'},
1367 {"etype", a_argument, NULL, 'E'},
1368 {"bits", a_argument, NULL, 'M'},
1369 {"all", no_argument, NULL, 'a'},
1370 {"quiet", no_argument, NULL, 'q'},
1371 {"verbose", no_argument, NULL, 'v'},
1372 {"format", a_argument, NULL, 'F'},
1373 {"from", a_argument, NULL, 'f'},
1374 {"file", a_argument, NULL, 'o'},
1375 {"nobanner", no_argument, NULL, 'B'},
1376 {"help", no_argument, NULL, 'h'},
1377 {"version", no_argument, NULL, 'V'},
1378 {NULL, no_argument, NULL, 0x0}
1379 };
1380
1381 static const char *opts_help[] = {
1382 "Scan all directories in PATH environment",
1383 "Scan all directories in /etc/ld.so.conf",
1384 "Scan directories recursively",
1385 "Don't recursively cross mount points",
1386 "Don't scan symlinks",
1387 "Scan archives (.a files)",
1388 "Utilize ld.so.cache information (use with -r/-n)",
1389 "Try and 'fix' bad things (use with -r/-e)",
1390 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1391 "Print PaX markings",
1392 "Print GNU_STACK/PT_LOAD markings",
1393 "Print TEXTREL information",
1394 "Print RPATH information",
1395 "Print NEEDED information",
1396 "Print INTERP information",
1397 "Print BIND information",
1398 "Print SONAME information",
1399 "Find a specified symbol",
1400 "Find a specified section",
1401 "Find a specified library",
1402 "Use strncmp to match libraries. (use with -N)",
1403 "Locate cause of TEXTREL",
1404 "Print only ELF files matching numeric constant type",
1405 "Print only ELF files matching numeric bits",
1406 "Print all scanned info (-x -e -t -r -b)\n",
1407 "Only output 'bad' things",
1408 "Be verbose (can be specified more than once)",
1409 "Use specified format for output",
1410 "Read input stream from a filename",
1411 "Write output stream to a filename",
1412 "Don't display the header",
1413 "Print this help and exit",
1414 "Print version and exit",
1415 NULL
1416 };
1417
1418 /* display usage and exit */
1419 static void usage(int status)
1420 {
1421 unsigned long i;
1422 printf("* Scan ELF binaries for stuff\n\n"
1423 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1424 printf("Options: -[%s]\n", PARSE_FLAGS);
1425 for (i = 0; long_opts[i].name; ++i)
1426 if (long_opts[i].has_arg == no_argument)
1427 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1428 long_opts[i].name, opts_help[i]);
1429 else
1430 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1431 long_opts[i].name, opts_help[i]);
1432
1433 if (status != EXIT_SUCCESS)
1434 exit(status);
1435
1436 puts("\nThe format modifiers for the -F option are:");
1437 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1438 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1439 puts(" i INTERP \tb BIND \ts symbol");
1440 puts(" N library \to Type \tT TEXTRELs");
1441 puts(" S SONAME \tk section");
1442 puts(" p filename (with search path removed)");
1443 puts(" f filename (short name/basename)");
1444 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1445
1446 puts("\nELF Etypes:");
1447 print_etypes(stdout);
1448
1449 exit(status);
1450 }
1451
1452 /* parse command line arguments and preform needed actions */
1453 static void parseargs(int argc, char *argv[])
1454 {
1455 int i;
1456 char *from_file = NULL;
1457
1458 opterr = 0;
1459 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1460 switch (i) {
1461
1462 case 'V':
1463 printf("pax-utils-%s: %s compiled %s\n%s\n"
1464 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1465 VERSION, __FILE__, __DATE__, rcsid, argv0);
1466 exit(EXIT_SUCCESS);
1467 break;
1468 case 'h': usage(EXIT_SUCCESS); break;
1469 case 'f':
1470 if (from_file) warn("You prob don't want to specify -f twice");
1471 from_file = optarg;
1472 break;
1473 case 'E':
1474 strncpy(match_etypes, optarg, sizeof(match_etypes));
1475 break;
1476 case 'M':
1477 match_bits = atoi(optarg);
1478 break;
1479 case 'o': {
1480 FILE *fp = NULL;
1481 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1482 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1483 SET_STDOUT(fp);
1484 break;
1485 }
1486 case 'k':
1487 if (find_section) warn("You prob don't want to specify -k twice");
1488 find_section = optarg;
1489 break;
1490 case 's': {
1491 if (find_sym) warn("You prob don't want to specify -s twice");
1492 find_sym = optarg;
1493 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1494 sprintf(versioned_symname, "%s@", find_sym);
1495 break;
1496 }
1497 case 'N': {
1498 if (find_lib) warn("You prob don't want to specify -N twice");
1499 find_lib = optarg;
1500 break;
1501 }
1502
1503 case 'F': {
1504 if (out_format) warn("You prob don't want to specify -F twice");
1505 out_format = optarg;
1506 break;
1507 }
1508 case 'z': {
1509 unsigned long flags = 10240;
1510 size_t x;
1511
1512 #define do_state(option, flag) \
1513 if (islower(option)) { \
1514 flags &= ~PF_##flag; \
1515 flags |= PF_NO##flag; \
1516 } else { \
1517 flags &= ~PF_NO##flag; \
1518 flags |= PF_##flag; \
1519 }
1520
1521 for (x = 0 ; x < strlen(optarg); x++) {
1522 switch(optarg[x]) {
1523 case 'p':
1524 case 'P':
1525 do_state(optarg[x], PAGEEXEC);
1526 break;
1527 case 's':
1528 case 'S':
1529 do_state(optarg[x], SEGMEXEC);
1530 break;
1531 case 'm':
1532 case 'M':
1533 do_state(optarg[x], MPROTECT);
1534 break;
1535 case 'e':
1536 case 'E':
1537 do_state(optarg[x], EMUTRAMP);
1538 break;
1539 case 'r':
1540 case 'R':
1541 do_state(optarg[x], RANDMMAP);
1542 break;
1543 case 'x':
1544 case 'X':
1545 do_state(optarg[x], RANDEXEC);
1546 break;
1547 default:
1548 break;
1549 }
1550 }
1551 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1552 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1553 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1554 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1555 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1556 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1557 setpax = flags;
1558 break;
1559 }
1560 case 'g': gmatch = 1; break;
1561 case 'L': use_ldcache = 1; break;
1562 case 'y': scan_symlink = 0; break;
1563 case 'A': scan_archives = 1; break;
1564 case 'B': show_banner = 0; break;
1565 case 'l': scan_ldpath = 1; break;
1566 case 'p': scan_envpath = 1; break;
1567 case 'R': dir_recurse = 1; break;
1568 case 'm': dir_crossmount = 0; break;
1569 case 'X': ++fix_elf; break;
1570 case 'x': show_pax = 1; break;
1571 case 'e': show_phdr = 1; break;
1572 case 't': show_textrel = 1; break;
1573 case 'r': show_rpath = 1; break;
1574 case 'n': show_needed = 1; break;
1575 case 'i': show_interp = 1; break;
1576 case 'b': show_bind = 1; break;
1577 case 'S': show_soname = 1; break;
1578 case 'T': show_textrels = 1; break;
1579 case 'q': be_quiet = 1; break;
1580 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1581 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1582
1583 case ':':
1584 err("Option '%c' is missing parameter", optopt);
1585 case '?':
1586 err("Unknown option '%c' or argument missing", optopt);
1587 default:
1588 err("Unhandled option '%c'; please report this", i);
1589 }
1590 }
1591
1592 /* let the format option override all other options */
1593 if (out_format) {
1594 show_pax = show_phdr = show_textrel = show_rpath = \
1595 show_needed = show_interp = show_bind = show_soname = \
1596 show_textrels = 0;
1597 for (i = 0; out_format[i]; ++i) {
1598 if (!IS_MODIFIER(out_format[i])) continue;
1599
1600 switch (out_format[++i]) {
1601 case '%': break;
1602 case '#': break;
1603 case 'F': break;
1604 case 'p': break;
1605 case 'f': break;
1606 case 'k': break;
1607 case 's': break;
1608 case 'N': break;
1609 case 'o': break;
1610 case 'x': show_pax = 1; break;
1611 case 'e': show_phdr = 1; break;
1612 case 't': show_textrel = 1; break;
1613 case 'r': show_rpath = 1; break;
1614 case 'n': show_needed = 1; break;
1615 case 'i': show_interp = 1; break;
1616 case 'b': show_bind = 1; break;
1617 case 'S': show_soname = 1; break;
1618 case 'T': show_textrels = 1; break;
1619 default:
1620 err("Invalid format specifier '%c' (byte %i)",
1621 out_format[i], i+1);
1622 }
1623 }
1624
1625 /* construct our default format */
1626 } else {
1627 size_t fmt_len = 30;
1628 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1629 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1630 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1631 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1632 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1633 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1634 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1635 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1636 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1637 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1638 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1639 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1640 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1641 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1642 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1643 }
1644 if (be_verbose > 2) printf("Format: %s\n", out_format);
1645
1646 /* now lets actually do the scanning */
1647 if (scan_ldpath || use_ldcache)
1648 load_ld_so_conf(0, "/etc/ld.so.conf");
1649 if (scan_ldpath) scanelf_ldpath();
1650 if (scan_envpath) scanelf_envpath();
1651 if (from_file) {
1652 scanelf_from_file(from_file);
1653 from_file = *argv;
1654 }
1655 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1656 err("Nothing to scan !?");
1657 while (optind < argc) {
1658 search_path = argv[optind++];
1659 scanelf_dir(search_path);
1660 }
1661
1662 /* clean up */
1663 if (versioned_symname) free(versioned_symname);
1664 for (i = 0; ldpaths[i]; ++i)
1665 free(ldpaths[i]);
1666
1667 if (ldcache != 0)
1668 munmap(ldcache, ldcache_size);
1669 }
1670
1671
1672
1673 /* utility funcs */
1674 static char *xstrdup(const char *s)
1675 {
1676 char *ret = strdup(s);
1677 if (!ret) err("Could not strdup(): %s", strerror(errno));
1678 return ret;
1679 }
1680 static void *xmalloc(size_t size)
1681 {
1682 void *ret = malloc(size);
1683 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1684 return ret;
1685 }
1686 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1687 {
1688 size_t new_len;
1689
1690 new_len = strlen(*dst) + strlen(src);
1691 if (*curr_len <= new_len) {
1692 *curr_len = new_len + (*curr_len / 2);
1693 *dst = realloc(*dst, *curr_len);
1694 if (!*dst)
1695 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1696 }
1697
1698 if (n)
1699 strncat(*dst, src, n);
1700 else
1701 strcat(*dst, src);
1702 }
1703 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1704 {
1705 static char my_app[2];
1706 my_app[0] = append;
1707 my_app[1] = '\0';
1708 xstrcat(dst, my_app, curr_len);
1709 }
1710
1711
1712
1713 int main(int argc, char *argv[])
1714 {
1715 if (argc < 2)
1716 usage(EXIT_FAILURE);
1717 parseargs(argc, argv);
1718 fclose(stdout);
1719 #ifdef __BOUNDS_CHECKING_ON
1720 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1721 #endif
1722 return EXIT_SUCCESS;
1723 }

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