/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.141 - (show annotations) (download) (as text)
Sun Apr 23 15:24:38 2006 UTC (8 years ago) by flameeyes
Branch: MAIN
Changes since 1.140: +64 -6 lines
File MIME type: text/x-csrc
Implement function to lookup into ld-elf.so.hints file on FreeBSD and DragonFly, change to GLIBC/UCLIBC conditionals access to ld.so.conf and ls.so.cache (should work on GNU/kFreeBSD).

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 1.140 2006/04/15 07:52:00 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 #if defined(__GLIBC__) || defined(__UCLIBC__)
12 #include <glob.h>
13 #endif
14 #if defined(__FreeBSD__) || defined(__DragonFly__)
15 #include <elf-hints.h>
16 #endif
17
18 static const char *rcsid = "$Id: scanelf.c,v 1.140 2006/04/15 07:52:00 vapier Exp $";
19 #define argv0 "scanelf"
20
21 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
22
23 #define do_state(option, flag) \
24 if (islower(option)) { \
25 flags &= ~PF_##flag; \
26 flags |= PF_NO##flag; \
27 } else { \
28 flags &= ~PF_NO##flag; \
29 flags |= PF_##flag; \
30 }
31
32
33 /* prototypes */
34 static int scanelf_elfobj(elfobj *elf);
35 static int scanelf_elf(const char *filename, int fd, size_t len);
36 static int scanelf_archive(const char *filename, int fd, size_t len);
37 static void scanelf_file(const char *filename);
38 static void scanelf_dir(const char *path);
39 static void scanelf_ldpath(void);
40 static void scanelf_envpath(void);
41 static void usage(int status);
42 static void parseargs(int argc, char *argv[]);
43 static char *xstrdup(const char *s);
44 static void *xmalloc(size_t size);
45 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
46 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
47 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
48
49 /* variables to control behavior */
50 static char match_etypes[126] = "";
51 static char *ldpaths[256];
52 static char scan_ldpath = 0;
53 static char scan_envpath = 0;
54 static char scan_symlink = 1;
55 static char scan_archives = 0;
56 static char dir_recurse = 0;
57 static char dir_crossmount = 1;
58 static char show_pax = 0;
59 static char show_phdr = 0;
60 static char show_textrel = 0;
61 static char show_rpath = 0;
62 static char show_needed = 0;
63 static char show_interp = 0;
64 static char show_bind = 0;
65 static char show_soname = 0;
66 static char show_textrels = 0;
67 static char show_banner = 1;
68 static char be_quiet = 0;
69 static char be_verbose = 0;
70 static char be_wewy_wewy_quiet = 0;
71 static char be_semi_verbose = 0;
72 static char *find_sym = NULL, *versioned_symname = NULL;
73 static char *find_lib = NULL;
74 static char *find_section = NULL;
75 static char *out_format = NULL;
76 static char *search_path = NULL;
77 static char fix_elf = 0;
78 static char gmatch = 0;
79 static char use_ldcache = 0;
80
81 int match_bits = 0;
82 caddr_t ldcache = 0;
83 size_t ldcache_size = 0;
84 unsigned long setpax = 0UL;
85
86 /* sub-funcs for scanelf_file() */
87 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
88 {
89 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
90 #define GET_SYMTABS(B) \
91 if (elf->elf_class == ELFCLASS ## B) { \
92 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
93 /* debug sections */ \
94 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
95 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
96 /* runtime sections */ \
97 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
98 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
99 if (symtab && dynsym) { \
100 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
101 } else { \
102 *sym = (void*)(symtab ? symtab : dynsym); \
103 } \
104 if (strtab && dynstr) { \
105 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
106 } else { \
107 *tab = (void*)(strtab ? strtab : dynstr); \
108 } \
109 }
110 GET_SYMTABS(32)
111 GET_SYMTABS(64)
112 }
113
114 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
115 {
116 static char ret[7];
117 unsigned long i, shown;
118
119 if (!show_pax) return NULL;
120
121 shown = 0;
122 memset(&ret, 0, sizeof(ret));
123
124 if (elf->phdr) {
125 #define SHOW_PAX(B) \
126 if (elf->elf_class == ELFCLASS ## B) { \
127 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
128 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
129 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
130 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
131 continue; \
132 if (fix_elf && setpax) { \
133 /* set the paxctl flags */ \
134 ESET(phdr[i].p_flags, setpax); \
135 } \
136 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
137 continue; \
138 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
139 *found_pax = 1; \
140 ++shown; \
141 break; \
142 } \
143 }
144 SHOW_PAX(32)
145 SHOW_PAX(64)
146 }
147
148
149 if (fix_elf && setpax) {
150 /* set the chpax settings */
151 if (elf->elf_class == ELFCLASS32) {
152 if (EHDR32(elf->ehdr)->e_type == ET_DYN || EHDR32(elf->ehdr)->e_type == ET_EXEC)
153 ESET(EHDR32(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
154 } else {
155 if (EHDR64(elf->ehdr)->e_type == ET_DYN || EHDR64(elf->ehdr)->e_type == ET_EXEC)
156 ESET(EHDR64(elf->ehdr)->e_ident[EI_PAX], pax_pf2hf_flags(setpax));
157 }
158 }
159
160 /* fall back to EI_PAX if no PT_PAX was found */
161 if (!*ret) {
162 static char *paxflags;
163 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
164 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
165 *found_pax = 1;
166 return (be_wewy_wewy_quiet ? NULL : paxflags);
167 }
168 strncpy(ret, paxflags, sizeof(ret));
169 }
170
171 if (be_wewy_wewy_quiet || (be_quiet && !shown))
172 return NULL;
173 else
174 return ret;
175 }
176
177 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
178 {
179 static char ret[12];
180 char *found;
181 unsigned long i, shown, multi_stack, multi_relro, multi_load;
182 int max_pt_load;
183
184 if (!show_phdr) return NULL;
185
186 memcpy(ret, "--- --- ---\0", 12);
187
188 shown = 0;
189 multi_stack = multi_relro = multi_load = 0;
190 max_pt_load = elf_max_pt_load(elf);
191
192 #define NOTE_GNU_STACK ".note.GNU-stack"
193 #define SHOW_PHDR(B) \
194 if (elf->elf_class == ELFCLASS ## B) { \
195 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
196 Elf ## B ## _Off offset; \
197 uint32_t flags, check_flags; \
198 if (elf->phdr != NULL) { \
199 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
200 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
201 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
202 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
203 found = found_phdr; \
204 offset = 0; \
205 check_flags = PF_X; \
206 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
207 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
208 found = found_relro; \
209 offset = 4; \
210 check_flags = PF_X; \
211 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
212 if (ehdr->e_type == ET_DYN || ehdr->e_type == ET_EXEC) \
213 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
214 found = found_load; \
215 offset = 8; \
216 check_flags = PF_W|PF_X; \
217 } else \
218 continue; \
219 flags = EGET(phdr[i].p_flags); \
220 if (be_quiet && ((flags & check_flags) != check_flags)) \
221 continue; \
222 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
223 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
224 ret[3] = ret[7] = '!'; \
225 flags = EGET(phdr[i].p_flags); \
226 } \
227 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
228 *found = 1; \
229 ++shown; \
230 } \
231 } else if (elf->shdr != NULL) { \
232 /* no program headers which means this is prob an object file */ \
233 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
234 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
235 char *str; \
236 if ((void*)strtbl > (void*)elf->data_end) \
237 goto skip_this_shdr##B; \
238 check_flags = SHF_WRITE|SHF_EXECINSTR; \
239 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
240 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
241 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
242 str = elf->data + offset; \
243 if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
244 if (!strcmp(str, NOTE_GNU_STACK)) { \
245 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
246 flags = EGET(shdr[i].sh_flags); \
247 if (be_quiet && ((flags & check_flags) != check_flags)) \
248 continue; \
249 ++*found_phdr; \
250 shown = 1; \
251 if (flags & SHF_WRITE) ret[0] = 'W'; \
252 if (flags & SHF_ALLOC) ret[1] = 'A'; \
253 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
254 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
255 break; \
256 } \
257 } \
258 skip_this_shdr##B: \
259 if (!multi_stack) { \
260 *found_phdr = 1; \
261 shown = 1; \
262 memcpy(ret, "!WX", 3); \
263 } \
264 } \
265 }
266 SHOW_PHDR(32)
267 SHOW_PHDR(64)
268
269 if (be_wewy_wewy_quiet || (be_quiet && !shown))
270 return NULL;
271 else
272 return ret;
273 }
274 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
275 {
276 static const char *ret = "TEXTREL";
277 unsigned long i;
278
279 if (!show_textrel && !show_textrels) return NULL;
280
281 if (elf->phdr) {
282 #define SHOW_TEXTREL(B) \
283 if (elf->elf_class == ELFCLASS ## B) { \
284 Elf ## B ## _Dyn *dyn; \
285 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
286 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
287 Elf ## B ## _Off offset; \
288 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
289 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
290 offset = EGET(phdr[i].p_offset); \
291 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
292 dyn = DYN ## B (elf->data + offset); \
293 while (EGET(dyn->d_tag) != DT_NULL) { \
294 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
295 *found_textrel = 1; \
296 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
297 return (be_wewy_wewy_quiet ? NULL : ret); \
298 } \
299 ++dyn; \
300 } \
301 } }
302 SHOW_TEXTREL(32)
303 SHOW_TEXTREL(64)
304 }
305
306 if (be_quiet || be_wewy_wewy_quiet)
307 return NULL;
308 else
309 return " - ";
310 }
311 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
312 {
313 unsigned long s, r, rmax;
314 void *symtab_void, *strtab_void, *text_void;
315
316 if (!show_textrels) return NULL;
317
318 /* don't search for TEXTREL's if the ELF doesn't have any */
319 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
320 if (!*found_textrel) return NULL;
321
322 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
323 text_void = elf_findsecbyname(elf, ".text");
324
325 if (symtab_void && strtab_void && text_void && elf->shdr) {
326 #define SHOW_TEXTRELS(B) \
327 if (elf->elf_class == ELFCLASS ## B) { \
328 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
329 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
330 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
331 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
332 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
333 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
334 uint ## B ## _t memsz = EGET(text->sh_size); \
335 Elf ## B ## _Rel *rel; \
336 Elf ## B ## _Rela *rela; \
337 /* search the section headers for relocations */ \
338 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
339 uint32_t sh_type = EGET(shdr[s].sh_type); \
340 if (sh_type == SHT_REL) { \
341 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
342 rela = NULL; \
343 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
344 } else if (sh_type == SHT_RELA) { \
345 rel = NULL; \
346 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
347 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
348 } else \
349 continue; \
350 /* now see if any of the relocs are in the .text */ \
351 for (r = 0; r < rmax; ++r) { \
352 unsigned long sym_max; \
353 Elf ## B ## _Addr offset_tmp; \
354 Elf ## B ## _Sym *func; \
355 Elf ## B ## _Sym *sym; \
356 Elf ## B ## _Addr r_offset; \
357 uint ## B ## _t r_info; \
358 if (sh_type == SHT_REL) { \
359 r_offset = EGET(rel[r].r_offset); \
360 r_info = EGET(rel[r].r_info); \
361 } else { \
362 r_offset = EGET(rela[r].r_offset); \
363 r_info = EGET(rela[r].r_info); \
364 } \
365 /* make sure this relocation is inside of the .text */ \
366 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
367 if (be_verbose <= 2) continue; \
368 } else \
369 *found_textrels = 1; \
370 /* locate this relocation symbol name */ \
371 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
372 if ((void*)sym > (void*)elf->data_end) { \
373 warn("%s: corrupt ELF symbol", elf->filename); \
374 continue; \
375 } \
376 sym_max = ELF ## B ## _R_SYM(r_info); \
377 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
378 sym += sym_max; \
379 else \
380 sym = NULL; \
381 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
382 /* show the raw details about this reloc */ \
383 printf(" %s: ", elf->base_filename); \
384 if (sym && sym->st_name) \
385 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
386 else \
387 printf("(memory/fake?)"); \
388 printf(" [0x%lX]", (unsigned long)r_offset); \
389 /* now try to find the closest symbol that this rel is probably in */ \
390 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
391 func = NULL; \
392 offset_tmp = 0; \
393 while (sym_max--) { \
394 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
395 func = sym; \
396 offset_tmp = EGET(sym->st_value); \
397 } \
398 ++sym; \
399 } \
400 printf(" in "); \
401 if (func && func->st_name) \
402 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
403 else \
404 printf("(NULL: fake?)"); \
405 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
406 } \
407 } }
408 SHOW_TEXTRELS(32)
409 SHOW_TEXTRELS(64)
410 }
411 if (!*found_textrels)
412 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
413
414 return NULL;
415 }
416
417 static void rpath_security_checks(elfobj *, char *, const char *);
418 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
419 {
420 struct stat st;
421 switch (*item) {
422 case '/': break;
423 case '.':
424 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
425 break;
426 case ':':
427 case '\0':
428 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
429 break;
430 case '$':
431 if (fstat(elf->fd, &st) != -1)
432 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
433 warnf("Security problem with %s='%s' in %s with mode set of %o",
434 dt_type, item, elf->filename, st.st_mode & 07777);
435 break;
436 default:
437 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
438 break;
439 }
440 }
441 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
442 {
443 unsigned long i, s;
444 char *rpath, *runpath, **r;
445 void *strtbl_void;
446
447 if (!show_rpath) return;
448
449 strtbl_void = elf_findsecbyname(elf, ".dynstr");
450 rpath = runpath = NULL;
451
452 if (elf->phdr && strtbl_void) {
453 #define SHOW_RPATH(B) \
454 if (elf->elf_class == ELFCLASS ## B) { \
455 Elf ## B ## _Dyn *dyn; \
456 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
457 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
458 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
459 Elf ## B ## _Off offset; \
460 Elf ## B ## _Xword word; \
461 /* Scan all the program headers */ \
462 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
463 /* Just scan dynamic headers */ \
464 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
465 offset = EGET(phdr[i].p_offset); \
466 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
467 /* Just scan dynamic RPATH/RUNPATH headers */ \
468 dyn = DYN ## B (elf->data + offset); \
469 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
470 if (word == DT_RPATH) { \
471 r = &rpath; \
472 } else if (word == DT_RUNPATH) { \
473 r = &runpath; \
474 } else { \
475 ++dyn; \
476 continue; \
477 } \
478 /* Verify the memory is somewhat sane */ \
479 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
480 if (offset < (Elf ## B ## _Off)elf->len) { \
481 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
482 *r = (char*)(elf->data + offset); \
483 /* cache the length in case we need to nuke this section later on */ \
484 if (fix_elf) \
485 offset = strlen(*r); \
486 /* If quiet, don't output paths in ld.so.conf */ \
487 if (be_quiet) { \
488 size_t len; \
489 char *start, *end; \
490 /* note that we only 'chop' off leading known paths. */ \
491 /* since *r is read-only memory, we can only move the ptr forward. */ \
492 start = *r; \
493 /* scan each path in : delimited list */ \
494 while (start) { \
495 rpath_security_checks(elf, start, get_elfdtype(word)); \
496 end = strchr(start, ':'); \
497 len = (end ? abs(end - start) : strlen(start)); \
498 if (use_ldcache) \
499 for (s = 0; ldpaths[s]; ++s) \
500 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
501 *r = end; \
502 /* corner case ... if RPATH reads "/usr/lib:", we want \
503 * to show ':' rather than '' */ \
504 if (end && end[1] != '\0') \
505 (*r)++; \
506 break; \
507 } \
508 if (!*r || !end) \
509 break; \
510 else \
511 start = start + len + 1; \
512 } \
513 } \
514 if (*r) { \
515 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
516 /* just nuke it */ \
517 nuke_it##B: \
518 memset(*r, 0x00, offset); \
519 *r = NULL; \
520 ESET(dyn->d_tag, DT_DEBUG); \
521 ESET(dyn->d_un.d_ptr, 0); \
522 } else if (fix_elf) { \
523 /* try to clean "bad" paths */ \
524 size_t len, tmpdir_len; \
525 char *start, *end; \
526 const char *tmpdir; \
527 start = *r; \
528 tmpdir = (getenv("TMPDIR") ? : "."); \
529 tmpdir_len = strlen(tmpdir); \
530 while (1) { \
531 end = strchr(start, ':'); \
532 if (start == end) { \
533 eat_this_path##B: \
534 len = strlen(end); \
535 memmove(start, end+1, len); \
536 start[len-1] = '\0'; \
537 end = start - 1; \
538 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
539 if (!end) { \
540 if (start == *r) \
541 goto nuke_it##B; \
542 *--start = '\0'; \
543 } else \
544 goto eat_this_path##B; \
545 } \
546 if (!end) \
547 break; \
548 start = end + 1; \
549 } \
550 if (**r == '\0') \
551 goto nuke_it##B; \
552 } \
553 if (*r) \
554 *found_rpath = 1; \
555 } \
556 } \
557 ++dyn; \
558 } \
559 } }
560 SHOW_RPATH(32)
561 SHOW_RPATH(64)
562 }
563
564 if (be_wewy_wewy_quiet) return;
565
566 if (rpath && runpath) {
567 if (!strcmp(rpath, runpath)) {
568 xstrcat(ret, runpath, ret_len);
569 } else {
570 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
571 xchrcat(ret, '{', ret_len);
572 xstrcat(ret, rpath, ret_len);
573 xchrcat(ret, ',', ret_len);
574 xstrcat(ret, runpath, ret_len);
575 xchrcat(ret, '}', ret_len);
576 }
577 } else if (rpath || runpath)
578 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
579 else if (!be_quiet)
580 xstrcat(ret, " - ", ret_len);
581 }
582
583 #define LDSO_CACHE_MAGIC "ld.so-"
584 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
585 #define LDSO_CACHE_VER "1.7.0"
586 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
587 #define FLAG_ANY -1
588 #define FLAG_TYPE_MASK 0x00ff
589 #define FLAG_LIBC4 0x0000
590 #define FLAG_ELF 0x0001
591 #define FLAG_ELF_LIBC5 0x0002
592 #define FLAG_ELF_LIBC6 0x0003
593 #define FLAG_REQUIRED_MASK 0xff00
594 #define FLAG_SPARC_LIB64 0x0100
595 #define FLAG_IA64_LIB64 0x0200
596 #define FLAG_X8664_LIB64 0x0300
597 #define FLAG_S390_LIB64 0x0400
598 #define FLAG_POWERPC_LIB64 0x0500
599 #define FLAG_MIPS64_LIBN32 0x0600
600 #define FLAG_MIPS64_LIBN64 0x0700
601
602 static char *lookup_cache_lib(elfobj *, char *);
603 #if defined(__GLIBC__) || defined(__UCLIBC__)
604 static char *lookup_cache_lib(elfobj *elf, char *fname)
605 {
606 int fd = 0;
607 char *strs;
608 static char buf[__PAX_UTILS_PATH_MAX] = "";
609 const char *cachefile = "/etc/ld.so.cache";
610 struct stat st;
611
612 typedef struct {
613 char magic[LDSO_CACHE_MAGIC_LEN];
614 char version[LDSO_CACHE_VER_LEN];
615 int nlibs;
616 } header_t;
617 header_t *header;
618
619 typedef struct {
620 int flags;
621 int sooffset;
622 int liboffset;
623 } libentry_t;
624 libentry_t *libent;
625
626 if (fname == NULL)
627 return NULL;
628
629 if (ldcache == 0) {
630 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
631 return NULL;
632
633 /* cache these values so we only map/unmap the cache file once */
634 ldcache_size = st.st_size;
635 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
636
637 close(fd);
638
639 if (ldcache == (caddr_t)-1) {
640 ldcache = 0;
641 return NULL;
642 }
643
644 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
645 return NULL;
646 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
647 return NULL;
648 }
649
650 header = (header_t *) ldcache;
651 libent = (libentry_t *) (ldcache + sizeof(header_t));
652 strs = (char *) &libent[header->nlibs];
653
654 for (fd = 0; fd < header->nlibs; fd++) {
655 /* this should be more fine grained, but for now we assume that
656 * diff arches will not be cached together. and we ignore the
657 * the different multilib mips cases. */
658 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
659 continue;
660 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
661 continue;
662
663 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
664 continue;
665 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
666 }
667 return buf;
668 }
669 #else
670 #warning Cache support not implemented for your current target.
671 static char *lookup_cache_lib(elfobj *elf, char *fname)
672 {
673 return NULL;
674 }
675 #endif
676
677 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
678 {
679 unsigned long i;
680 char *needed;
681 void *strtbl_void;
682 char *p;
683
684 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
685
686 strtbl_void = elf_findsecbyname(elf, ".dynstr");
687
688 if (elf->phdr && strtbl_void) {
689 #define SHOW_NEEDED(B) \
690 if (elf->elf_class == ELFCLASS ## B) { \
691 Elf ## B ## _Dyn *dyn; \
692 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
693 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
694 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
695 Elf ## B ## _Off offset; \
696 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
697 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
698 offset = EGET(phdr[i].p_offset); \
699 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
700 dyn = DYN ## B (elf->data + offset); \
701 while (EGET(dyn->d_tag) != DT_NULL) { \
702 if (EGET(dyn->d_tag) == DT_NEEDED) { \
703 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
704 if (offset >= (Elf ## B ## _Off)elf->len) { \
705 ++dyn; \
706 continue; \
707 } \
708 needed = (char*)(elf->data + offset); \
709 if (op == 0) { \
710 if (!be_wewy_wewy_quiet) { \
711 if (*found_needed) xchrcat(ret, ',', ret_len); \
712 if (use_ldcache) \
713 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
714 needed = p; \
715 xstrcat(ret, needed, ret_len); \
716 } \
717 *found_needed = 1; \
718 } else { \
719 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
720 *found_lib = 1; \
721 return (be_wewy_wewy_quiet ? NULL : needed); \
722 } \
723 } \
724 } \
725 ++dyn; \
726 } \
727 } }
728 SHOW_NEEDED(32)
729 SHOW_NEEDED(64)
730 if (op == 0 && !*found_needed && be_verbose)
731 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
732 }
733
734 return NULL;
735 }
736 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
737 {
738 void *strtbl_void;
739
740 if (!show_interp) return NULL;
741
742 strtbl_void = elf_findsecbyname(elf, ".interp");
743
744 if (strtbl_void) {
745 #define SHOW_INTERP(B) \
746 if (elf->elf_class == ELFCLASS ## B) { \
747 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
748 *found_interp = 1; \
749 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
750 }
751 SHOW_INTERP(32)
752 SHOW_INTERP(64)
753 }
754 return NULL;
755 }
756 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
757 {
758 unsigned long i;
759 struct stat s;
760 char dynamic = 0;
761
762 if (!show_bind) return NULL;
763 if (!elf->phdr) return NULL;
764
765 #define SHOW_BIND(B) \
766 if (elf->elf_class == ELFCLASS ## B) { \
767 Elf ## B ## _Dyn *dyn; \
768 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
769 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
770 Elf ## B ## _Off offset; \
771 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
772 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
773 dynamic = 1; \
774 offset = EGET(phdr[i].p_offset); \
775 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
776 dyn = DYN ## B (elf->data + offset); \
777 while (EGET(dyn->d_tag) != DT_NULL) { \
778 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
779 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
780 { \
781 if (be_quiet) return NULL; \
782 *found_bind = 1; \
783 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
784 } \
785 ++dyn; \
786 } \
787 } \
788 }
789 SHOW_BIND(32)
790 SHOW_BIND(64)
791
792 if (be_wewy_wewy_quiet) return NULL;
793
794 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
795 return NULL;
796 } else {
797 *found_bind = 1;
798 return (char *) (dynamic ? "LAZY" : "STATIC");
799 }
800 }
801 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
802 {
803 unsigned long i;
804 char *soname;
805 void *strtbl_void;
806
807 if (!show_soname) return NULL;
808
809 strtbl_void = elf_findsecbyname(elf, ".dynstr");
810
811 if (elf->phdr && strtbl_void) {
812 #define SHOW_SONAME(B) \
813 if (elf->elf_class == ELFCLASS ## B) { \
814 Elf ## B ## _Dyn *dyn; \
815 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
816 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
817 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
818 Elf ## B ## _Off offset; \
819 /* only look for soname in shared objects */ \
820 if (ehdr->e_type != ET_DYN) \
821 return NULL; \
822 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
823 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
824 offset = EGET(phdr[i].p_offset); \
825 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
826 dyn = DYN ## B (elf->data + offset); \
827 while (EGET(dyn->d_tag) != DT_NULL) { \
828 if (EGET(dyn->d_tag) == DT_SONAME) { \
829 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
830 if (offset >= (Elf ## B ## _Off)elf->len) { \
831 ++dyn; \
832 continue; \
833 } \
834 soname = (char*)(elf->data + offset); \
835 *found_soname = 1; \
836 return (be_wewy_wewy_quiet ? NULL : soname); \
837 } \
838 ++dyn; \
839 } \
840 } }
841 SHOW_SONAME(32)
842 SHOW_SONAME(64)
843 }
844
845 return NULL;
846 }
847 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
848 {
849 unsigned long i;
850 char *ret;
851 void *symtab_void, *strtab_void;
852
853 if (!find_sym) return NULL;
854 ret = find_sym;
855
856 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
857
858 if (symtab_void && strtab_void) {
859 #define FIND_SYM(B) \
860 if (elf->elf_class == ELFCLASS ## B) { \
861 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
862 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
863 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
864 unsigned long cnt = EGET(symtab->sh_entsize); \
865 char *symname; \
866 if (cnt) \
867 cnt = EGET(symtab->sh_size) / cnt; \
868 for (i = 0; i < cnt; ++i) { \
869 if (sym->st_name) { \
870 /* make sure the symbol name is in acceptable memory range */ \
871 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
872 if ((void*)symname > (void*)elf->data_end) { \
873 warnf("%s: corrupt ELF symbols", elf->filename); \
874 ++sym; \
875 continue; \
876 } \
877 /* debug display ... show all symbols and some extra info */ \
878 if (*ret == '*') { \
879 printf("%s(%s) %5lX %15s %s\n", \
880 ((*found_sym == 0) ? "\n\t" : "\t"), \
881 elf->base_filename, \
882 (unsigned long)sym->st_size, \
883 get_elfstttype(sym->st_info), \
884 symname); \
885 *found_sym = 1; \
886 } else { \
887 /* allow the user to specify a comma delimited list of symbols to search for */ \
888 char *this_sym, *next_sym; \
889 this_sym = ret; \
890 do { \
891 next_sym = strchr(this_sym, ','); \
892 if (next_sym == NULL) \
893 next_sym = this_sym + strlen(this_sym); \
894 /* do we want a defined symbol ? */ \
895 if (*this_sym == '+') { \
896 if (sym->st_shndx == SHN_UNDEF) \
897 goto skip_this_sym##B; \
898 ++this_sym; \
899 /* do we want an undefined symbol ? */ \
900 } else if (*this_sym == '-') { \
901 if (sym->st_shndx != SHN_UNDEF) \
902 goto skip_this_sym##B; \
903 ++this_sym; \
904 } \
905 /* ok, lets compare the name now */ \
906 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
907 (strcmp(symname, versioned_symname) == 0)) { \
908 if (be_semi_verbose) { \
909 char buf[126]; \
910 snprintf(buf, sizeof(buf), "%lX %s %s", \
911 (unsigned long)sym->st_size, get_elfstttype(sym->st_info), this_sym); \
912 ret = buf; \
913 } else \
914 ret = this_sym; \
915 (*found_sym)++; \
916 goto break_out; \
917 } \
918 skip_this_sym##B: this_sym = next_sym + 1; \
919 } while (*next_sym != '\0'); \
920 } \
921 } \
922 ++sym; \
923 } }
924 FIND_SYM(32)
925 FIND_SYM(64)
926 }
927
928 break_out:
929 if (be_wewy_wewy_quiet) return NULL;
930
931 if (*find_sym != '*' && *found_sym)
932 return ret;
933 if (be_quiet)
934 return NULL;
935 else
936 return (char *)" - ";
937 }
938
939
940 static char *scanelf_file_sections(elfobj *elf, char *found_section)
941 {
942 if (!find_section)
943 return NULL;
944
945 #define FIND_SECTION(B) \
946 if (elf->elf_class == ELFCLASS ## B) { \
947 int invert; \
948 Elf ## B ## _Shdr *section; \
949 invert = (*find_section == '!' ? 1 : 0); \
950 section = SHDR ## B (elf_findsecbyname(elf, find_section+invert)); \
951 if ((section == NULL && invert) || (section != NULL && !invert)) \
952 *found_section = 1; \
953 }
954 FIND_SECTION(32)
955 FIND_SECTION(64)
956
957 if (be_wewy_wewy_quiet)
958 return NULL;
959
960 if (*found_section)
961 return find_section;
962
963 if (be_quiet)
964 return NULL;
965 else
966 return (char *)" - ";
967 }
968
969 /* scan an elf file and show all the fun stuff */
970 #define prints(str) write(fileno(stdout), str, strlen(str))
971 static int scanelf_elfobj(elfobj *elf)
972 {
973 unsigned long i;
974 char found_pax, found_phdr, found_relro, found_load, found_textrel,
975 found_rpath, found_needed, found_interp, found_bind, found_soname,
976 found_sym, found_lib, found_file, found_textrels, found_section;
977 static char *out_buffer = NULL;
978 static size_t out_len;
979
980 found_pax = found_phdr = found_relro = found_load = found_textrel = \
981 found_rpath = found_needed = found_interp = found_bind = found_soname = \
982 found_sym = found_lib = found_file = found_textrels = found_section = 0;
983
984 if (be_verbose > 2)
985 printf("%s: scanning file {%s,%s}\n", elf->filename,
986 get_elfeitype(EI_CLASS, elf->elf_class),
987 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
988 else if (be_verbose > 1)
989 printf("%s: scanning file\n", elf->filename);
990
991 /* init output buffer */
992 if (!out_buffer) {
993 out_len = sizeof(char) * 80;
994 out_buffer = (char*)xmalloc(out_len);
995 }
996 *out_buffer = '\0';
997
998 /* show the header */
999 if (!be_quiet && show_banner) {
1000 for (i = 0; out_format[i]; ++i) {
1001 if (!IS_MODIFIER(out_format[i])) continue;
1002
1003 switch (out_format[++i]) {
1004 case '+': break;
1005 case '%': break;
1006 case '#': break;
1007 case 'F':
1008 case 'p':
1009 case 'f': prints("FILE "); found_file = 1; break;
1010 case 'o': prints(" TYPE "); break;
1011 case 'x': prints(" PAX "); break;
1012 case 'e': prints("STK/REL/PTL "); break;
1013 case 't': prints("TEXTREL "); break;
1014 case 'r': prints("RPATH "); break;
1015 case 'n': prints("NEEDED "); break;
1016 case 'i': prints("INTERP "); break;
1017 case 'b': prints("BIND "); break;
1018 case 'S': prints("SONAME "); break;
1019 case 's': prints("SYM "); break;
1020 case 'N': prints("LIB "); break;
1021 case 'T': prints("TEXTRELS "); break;
1022 case 'k': prints("SECTION "); break;
1023 default: warnf("'%c' has no title ?", out_format[i]);
1024 }
1025 }
1026 if (!found_file) prints("FILE ");
1027 prints("\n");
1028 found_file = 0;
1029 show_banner = 0;
1030 }
1031
1032 /* dump all the good stuff */
1033 for (i = 0; out_format[i]; ++i) {
1034 const char *out;
1035 const char *tmp;
1036
1037 if (!IS_MODIFIER(out_format[i])) {
1038 xchrcat(&out_buffer, out_format[i], &out_len);
1039 continue;
1040 }
1041
1042 out = NULL;
1043 be_wewy_wewy_quiet = (out_format[i] == '#');
1044 be_semi_verbose = (out_format[i] == '+');
1045 switch (out_format[++i]) {
1046 case '+':
1047 case '%':
1048 case '#':
1049 xchrcat(&out_buffer, out_format[i], &out_len); break;
1050 case 'F':
1051 found_file = 1;
1052 if (be_wewy_wewy_quiet) break;
1053 xstrcat(&out_buffer, elf->filename, &out_len);
1054 break;
1055 case 'p':
1056 found_file = 1;
1057 if (be_wewy_wewy_quiet) break;
1058 tmp = elf->filename;
1059 if (search_path) {
1060 ssize_t len_search = strlen(search_path);
1061 ssize_t len_file = strlen(elf->filename);
1062 if (!strncmp(elf->filename, search_path, len_search) && \
1063 len_file > len_search)
1064 tmp += len_search;
1065 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1066 }
1067 xstrcat(&out_buffer, tmp, &out_len);
1068 break;
1069 case 'f':
1070 found_file = 1;
1071 if (be_wewy_wewy_quiet) break;
1072 tmp = strrchr(elf->filename, '/');
1073 tmp = (tmp == NULL ? elf->filename : tmp+1);
1074 xstrcat(&out_buffer, tmp, &out_len);
1075 break;
1076 case 'o': out = get_elfetype(elf); break;
1077 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1078 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1079 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1080 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1081 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1082 case 'n':
1083 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1084 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1085 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1086 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1087 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1088 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1089 default: warnf("'%c' has no scan code?", out_format[i]);
1090 }
1091 if (out) {
1092 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
1093 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
1094 xstrncat(&out_buffer, out, &out_len, (tmp-out));
1095 else
1096 xstrcat(&out_buffer, out, &out_len);
1097 }
1098 }
1099
1100 #define FOUND_SOMETHING() \
1101 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1102 found_rpath || found_needed || found_interp || found_bind || \
1103 found_soname || found_sym || found_lib || found_textrels || found_section )
1104
1105 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1106 xchrcat(&out_buffer, ' ', &out_len);
1107 xstrcat(&out_buffer, elf->filename, &out_len);
1108 }
1109 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1110 puts(out_buffer);
1111 fflush(stdout);
1112 }
1113
1114 return 0;
1115 }
1116
1117 /* scan a single elf */
1118 static int scanelf_elf(const char *filename, int fd, size_t len)
1119 {
1120 int ret = 1;
1121 elfobj *elf;
1122
1123 /* verify this is real ELF */
1124 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1125 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1126 return ret;
1127 }
1128 switch (match_bits) {
1129 case 32:
1130 if (elf->elf_class != ELFCLASS32)
1131 goto label_done;
1132 break;
1133 case 64:
1134 if (elf->elf_class != ELFCLASS64)
1135 goto label_done;
1136 break;
1137 default: break;
1138 }
1139 if (strlen(match_etypes)) {
1140 char sbuf[126];
1141 strncpy(sbuf, match_etypes, sizeof(sbuf));
1142 if (strchr(match_etypes, ',') != NULL) {
1143 char *p;
1144 while((p = strrchr(sbuf, ',')) != NULL) {
1145 *p = 0;
1146 if (etype_lookup(p+1) == get_etype(elf))
1147 goto label_ret;
1148 }
1149 }
1150 if (etype_lookup(sbuf) != get_etype(elf))
1151 goto label_done;
1152 }
1153
1154 label_ret:
1155 ret = scanelf_elfobj(elf);
1156
1157 label_done:
1158 unreadelf(elf);
1159 return ret;
1160 }
1161
1162 /* scan an archive of elfs */
1163 static int scanelf_archive(const char *filename, int fd, size_t len)
1164 {
1165 archive_handle *ar;
1166 archive_member *m;
1167 char *ar_buffer;
1168 elfobj *elf;
1169
1170 ar = ar_open_fd(filename, fd);
1171 if (ar == NULL)
1172 return 1;
1173
1174 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1175 while ((m=ar_next(ar)) != NULL) {
1176 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1177 if (elf) {
1178 scanelf_elfobj(elf);
1179 unreadelf(elf);
1180 }
1181 }
1182 munmap(ar_buffer, len);
1183
1184 return 0;
1185 }
1186 /* scan a file which may be an elf or an archive or some other magical beast */
1187 static void scanelf_file(const char *filename)
1188 {
1189 struct stat st;
1190 int fd;
1191
1192 /* make sure 'filename' exists */
1193 if (lstat(filename, &st) == -1) {
1194 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1195 return;
1196 }
1197
1198 /* always handle regular files and handle symlinked files if no -y */
1199 if (S_ISLNK(st.st_mode)) {
1200 if (!scan_symlink) return;
1201 stat(filename, &st);
1202 }
1203 if (!S_ISREG(st.st_mode)) {
1204 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1205 return;
1206 }
1207
1208 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1209 return;
1210
1211 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1212 /* if it isn't an ELF, maybe it's an .a archive */
1213 scanelf_archive(filename, fd, st.st_size);
1214
1215 close(fd);
1216 }
1217
1218 /* scan a directory for ET_EXEC files and print when we find one */
1219 static void scanelf_dir(const char *path)
1220 {
1221 register DIR *dir;
1222 register struct dirent *dentry;
1223 struct stat st_top, st;
1224 char buf[__PAX_UTILS_PATH_MAX];
1225 size_t pathlen = 0, len = 0;
1226
1227 /* make sure path exists */
1228 if (lstat(path, &st_top) == -1) {
1229 if (be_verbose > 2) printf("%s: does not exist\n", path);
1230 return;
1231 }
1232
1233 /* ok, if it isn't a directory, assume we can open it */
1234 if (!S_ISDIR(st_top.st_mode)) {
1235 scanelf_file(path);
1236 return;
1237 }
1238
1239 /* now scan the dir looking for fun stuff */
1240 if ((dir = opendir(path)) == NULL) {
1241 warnf("could not opendir %s: %s", path, strerror(errno));
1242 return;
1243 }
1244 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1245
1246 pathlen = strlen(path);
1247 while ((dentry = readdir(dir))) {
1248 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1249 continue;
1250 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1251 if (len >= sizeof(buf)) {
1252 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1253 (unsigned long)len, (unsigned long)sizeof(buf));
1254 continue;
1255 }
1256 sprintf(buf, "%s/%s", path, dentry->d_name);
1257 if (lstat(buf, &st) != -1) {
1258 if (S_ISREG(st.st_mode))
1259 scanelf_file(buf);
1260 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1261 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1262 scanelf_dir(buf);
1263 }
1264 }
1265 }
1266 closedir(dir);
1267 }
1268
1269 static int scanelf_from_file(const char *filename)
1270 {
1271 FILE *fp = NULL;
1272 char *p;
1273 char path[__PAX_UTILS_PATH_MAX];
1274
1275 if (strcmp(filename, "-") == 0)
1276 fp = stdin;
1277 else if ((fp = fopen(filename, "r")) == NULL)
1278 return 1;
1279
1280 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1281 if ((p = strchr(path, '\n')) != NULL)
1282 *p = 0;
1283 search_path = path;
1284 scanelf_dir(path);
1285 }
1286 if (fp != stdin)
1287 fclose(fp);
1288 return 0;
1289 }
1290
1291 #if defined(__GLIBC__) || defined(__UCLIBC__)
1292 static int load_ld_so_conf(int i, const char *fname)
1293 {
1294 FILE *fp = NULL;
1295 char *p;
1296 char path[__PAX_UTILS_PATH_MAX];
1297
1298 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1299 return i;
1300
1301 if ((fp = fopen(fname, "r")) == NULL)
1302 return i;
1303
1304 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1305 if ((p = strrchr(path, '\r')) != NULL)
1306 *p = 0;
1307 if ((p = strchr(path, '\n')) != NULL)
1308 *p = 0;
1309 // recursive includes of the same file will make this segfault.
1310 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1311 glob64_t gl;
1312 size_t x;
1313 char gpath[__PAX_UTILS_PATH_MAX];
1314
1315 memset(gpath, 0, sizeof(gpath));
1316
1317 if (path[8] != '/')
1318 snprintf(gpath, sizeof(gpath), "/etc/%s", &path[8]);
1319 else
1320 strncpy(gpath, &path[8], sizeof(gpath));
1321
1322 if ((glob64(gpath, 0, NULL, &gl)) == 0) {
1323 for (x = 0; x < gl.gl_pathc; ++x) {
1324 /* try to avoid direct loops */
1325 if (strcmp(gl.gl_pathv[x], fname) == 0)
1326 continue;
1327 i = load_ld_so_conf(i, gl.gl_pathv[x]);
1328 if (i + 1 >= sizeof(ldpaths) / sizeof(*ldpaths)) {
1329 globfree64(&gl);
1330 return i;
1331 }
1332 }
1333 globfree64 (&gl);
1334 continue;
1335 } else
1336 abort();
1337 }
1338 if (*path != '/')
1339 continue;
1340
1341 ldpaths[i++] = xstrdup(path);
1342
1343 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1344 break;
1345 }
1346 ldpaths[i] = NULL;
1347
1348 fclose(fp);
1349 return i;
1350 }
1351 #endif
1352
1353 #if defined(__FreeBSD__) || (__DragonFly__)
1354 static int load_ld_so_hints(int i, const char *fname)
1355 {
1356 FILE *fp = NULL;
1357 char *b = NULL, *p;
1358 struct elfhints_hdr hdr;
1359
1360 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1361 return i;
1362
1363 if ((fp = fopen(fname, "r")) == NULL)
1364 return i;
1365
1366 if ( fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1367 hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1368 fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1
1369 ) {
1370 fclose(fp);
1371 return i;
1372 }
1373
1374 b = (char*)malloc(hdr.dirlistlen+1);
1375 if ( fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1 ) {
1376 fclose(fp);
1377 free(b);
1378 return i;
1379 }
1380
1381 while ( (p = strsep(&b, ":")) ) {
1382 if ( *p == '\0' ) continue;
1383 ldpaths[i++] = xstrdup(p);
1384
1385 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1386 break;
1387 }
1388 ldpaths[i] = NULL;
1389
1390 free(b);
1391 fclose(fp);
1392 return i;
1393 }
1394 #endif
1395
1396 /* scan /etc/ld.so.conf for paths */
1397 static void scanelf_ldpath()
1398 {
1399 char scan_l, scan_ul, scan_ull;
1400 int i = 0;
1401
1402 if (!ldpaths[0])
1403 err("Unable to load any paths from ld.so.conf");
1404
1405 scan_l = scan_ul = scan_ull = 0;
1406
1407 while (ldpaths[i]) {
1408 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1409 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1410 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1411 scanelf_dir(ldpaths[i]);
1412 ++i;
1413 }
1414
1415 if (!scan_l) scanelf_dir("/lib");
1416 if (!scan_ul) scanelf_dir("/usr/lib");
1417 if (!scan_ull) scanelf_dir("/usr/local/lib");
1418 }
1419
1420 /* scan env PATH for paths */
1421 static void scanelf_envpath()
1422 {
1423 char *path, *p;
1424
1425 path = getenv("PATH");
1426 if (!path)
1427 err("PATH is not set in your env !");
1428 path = xstrdup(path);
1429
1430 while ((p = strrchr(path, ':')) != NULL) {
1431 scanelf_dir(p + 1);
1432 *p = 0;
1433 }
1434
1435 free(path);
1436 }
1437
1438 /* usage / invocation handling functions */
1439 #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:BhV"
1440 #define a_argument required_argument
1441 static struct option const long_opts[] = {
1442 {"path", no_argument, NULL, 'p'},
1443 {"ldpath", no_argument, NULL, 'l'},
1444 {"recursive", no_argument, NULL, 'R'},
1445 {"mount", no_argument, NULL, 'm'},
1446 {"symlink", no_argument, NULL, 'y'},
1447 {"archives", no_argument, NULL, 'A'},
1448 {"ldcache", no_argument, NULL, 'L'},
1449 {"fix", no_argument, NULL, 'X'},
1450 {"setpax", a_argument, NULL, 'z'},
1451 {"pax", no_argument, NULL, 'x'},
1452 {"header", no_argument, NULL, 'e'},
1453 {"textrel", no_argument, NULL, 't'},
1454 {"rpath", no_argument, NULL, 'r'},
1455 {"needed", no_argument, NULL, 'n'},
1456 {"interp", no_argument, NULL, 'i'},
1457 {"bind", no_argument, NULL, 'b'},
1458 {"soname", no_argument, NULL, 'S'},
1459 {"symbol", a_argument, NULL, 's'},
1460 {"section", a_argument, NULL, 'k'},
1461 {"lib", a_argument, NULL, 'N'},
1462 {"gmatch", no_argument, NULL, 'g'},
1463 {"textrels", no_argument, NULL, 'T'},
1464 {"etype", a_argument, NULL, 'E'},
1465 {"bits", a_argument, NULL, 'M'},
1466 {"all", no_argument, NULL, 'a'},
1467 {"quiet", no_argument, NULL, 'q'},
1468 {"verbose", no_argument, NULL, 'v'},
1469 {"format", a_argument, NULL, 'F'},
1470 {"from", a_argument, NULL, 'f'},
1471 {"file", a_argument, NULL, 'o'},
1472 {"nobanner", no_argument, NULL, 'B'},
1473 {"help", no_argument, NULL, 'h'},
1474 {"version", no_argument, NULL, 'V'},
1475 {NULL, no_argument, NULL, 0x0}
1476 };
1477
1478 static const char *opts_help[] = {
1479 "Scan all directories in PATH environment",
1480 "Scan all directories in /etc/ld.so.conf",
1481 "Scan directories recursively",
1482 "Don't recursively cross mount points",
1483 "Don't scan symlinks",
1484 "Scan archives (.a files)",
1485 "Utilize ld.so.cache information (use with -r/-n)",
1486 "Try and 'fix' bad things (use with -r/-e)",
1487 "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1488 "Print PaX markings",
1489 "Print GNU_STACK/PT_LOAD markings",
1490 "Print TEXTREL information",
1491 "Print RPATH information",
1492 "Print NEEDED information",
1493 "Print INTERP information",
1494 "Print BIND information",
1495 "Print SONAME information",
1496 "Find a specified symbol",
1497 "Find a specified section",
1498 "Find a specified library",
1499 "Use strncmp to match libraries. (use with -N)",
1500 "Locate cause of TEXTREL",
1501 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
1502 "Print only ELF files matching numeric bits",
1503 "Print all scanned info (-x -e -t -r -b)\n",
1504 "Only output 'bad' things",
1505 "Be verbose (can be specified more than once)",
1506 "Use specified format for output",
1507 "Read input stream from a filename",
1508 "Write output stream to a filename",
1509 "Don't display the header",
1510 "Print this help and exit",
1511 "Print version and exit",
1512 NULL
1513 };
1514
1515 /* display usage and exit */
1516 static void usage(int status)
1517 {
1518 unsigned long i;
1519 printf("* Scan ELF binaries for stuff\n\n"
1520 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1521 printf("Options: -[%s]\n", PARSE_FLAGS);
1522 for (i = 0; long_opts[i].name; ++i)
1523 if (long_opts[i].has_arg == no_argument)
1524 printf(" -%c, --%-14s* %s\n", long_opts[i].val,
1525 long_opts[i].name, opts_help[i]);
1526 else
1527 printf(" -%c, --%-7s <arg> * %s\n", long_opts[i].val,
1528 long_opts[i].name, opts_help[i]);
1529
1530 if (status != EXIT_SUCCESS)
1531 exit(status);
1532
1533 puts("\nThe format modifiers for the -F option are:");
1534 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1535 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1536 puts(" i INTERP \tb BIND \ts symbol");
1537 puts(" N library \to Type \tT TEXTRELs");
1538 puts(" S SONAME \tk section");
1539 puts(" p filename (with search path removed)");
1540 puts(" f filename (short name/basename)");
1541 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1542
1543 puts("\nELF Etypes:");
1544 print_etypes(stdout);
1545
1546 exit(status);
1547 }
1548
1549 /* parse command line arguments and preform needed actions */
1550 static void parseargs(int argc, char *argv[])
1551 {
1552 int i;
1553 const char *from_file = NULL;
1554
1555 opterr = 0;
1556 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1557 switch (i) {
1558
1559 case 'V':
1560 printf("pax-utils-%s: %s compiled %s\n%s\n"
1561 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1562 VERSION, __FILE__, __DATE__, rcsid, argv0);
1563 exit(EXIT_SUCCESS);
1564 break;
1565 case 'h': usage(EXIT_SUCCESS); break;
1566 case 'f':
1567 if (from_file) warn("You prob don't want to specify -f twice");
1568 from_file = optarg;
1569 break;
1570 case 'E':
1571 strncpy(match_etypes, optarg, sizeof(match_etypes));
1572 break;
1573 case 'M':
1574 match_bits = atoi(optarg);
1575 break;
1576 case 'o': {
1577 FILE *fp = NULL;
1578 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1579 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1580 SET_STDOUT(fp);
1581 break;
1582 }
1583 case 'k':
1584 if (find_section) warn("You prob don't want to specify -k twice");
1585 find_section = optarg;
1586 break;
1587 case 's': {
1588 if (find_sym) warn("You prob don't want to specify -s twice");
1589 find_sym = optarg;
1590 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1591 sprintf(versioned_symname, "%s@", find_sym);
1592 break;
1593 }
1594 case 'N': {
1595 if (find_lib) warn("You prob don't want to specify -N twice");
1596 find_lib = optarg;
1597 break;
1598 }
1599
1600 case 'F': {
1601 if (out_format) warn("You prob don't want to specify -F twice");
1602 out_format = optarg;
1603 break;
1604 }
1605 case 'z': {
1606 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
1607 size_t x;
1608
1609 for (x = 0 ; x < strlen(optarg); x++) {
1610 switch(optarg[x]) {
1611 case 'p':
1612 case 'P':
1613 do_state(optarg[x], PAGEEXEC);
1614 break;
1615 case 's':
1616 case 'S':
1617 do_state(optarg[x], SEGMEXEC);
1618 break;
1619 case 'm':
1620 case 'M':
1621 do_state(optarg[x], MPROTECT);
1622 break;
1623 case 'e':
1624 case 'E':
1625 do_state(optarg[x], EMUTRAMP);
1626 break;
1627 case 'r':
1628 case 'R':
1629 do_state(optarg[x], RANDMMAP);
1630 break;
1631 case 'x':
1632 case 'X':
1633 do_state(optarg[x], RANDEXEC);
1634 break;
1635 default:
1636 break;
1637 }
1638 }
1639 if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
1640 ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
1641 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
1642 ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
1643 ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
1644 ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
1645 setpax = flags;
1646 break;
1647 }
1648 case 'g': gmatch = 1; break;
1649 case 'L': use_ldcache = 1; break;
1650 case 'y': scan_symlink = 0; break;
1651 case 'A': scan_archives = 1; break;
1652 case 'B': show_banner = 0; break;
1653 case 'l': scan_ldpath = 1; break;
1654 case 'p': scan_envpath = 1; break;
1655 case 'R': dir_recurse = 1; break;
1656 case 'm': dir_crossmount = 0; break;
1657 case 'X': ++fix_elf; break;
1658 case 'x': show_pax = 1; break;
1659 case 'e': show_phdr = 1; break;
1660 case 't': show_textrel = 1; break;
1661 case 'r': show_rpath = 1; break;
1662 case 'n': show_needed = 1; break;
1663 case 'i': show_interp = 1; break;
1664 case 'b': show_bind = 1; break;
1665 case 'S': show_soname = 1; break;
1666 case 'T': show_textrels = 1; break;
1667 case 'q': be_quiet = 1; break;
1668 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1669 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1670
1671 case ':':
1672 err("Option '%c' is missing parameter", optopt);
1673 case '?':
1674 err("Unknown option '%c' or argument missing", optopt);
1675 default:
1676 err("Unhandled option '%c'; please report this", i);
1677 }
1678 }
1679
1680 /* let the format option override all other options */
1681 if (out_format) {
1682 show_pax = show_phdr = show_textrel = show_rpath = \
1683 show_needed = show_interp = show_bind = show_soname = \
1684 show_textrels = 0;
1685 for (i = 0; out_format[i]; ++i) {
1686 if (!IS_MODIFIER(out_format[i])) continue;
1687
1688 switch (out_format[++i]) {
1689 case '+': break;
1690 case '%': break;
1691 case '#': break;
1692 case 'F': break;
1693 case 'p': break;
1694 case 'f': break;
1695 case 'k': break;
1696 case 's': break;
1697 case 'N': break;
1698 case 'o': break;
1699 case 'x': show_pax = 1; break;
1700 case 'e': show_phdr = 1; break;
1701 case 't': show_textrel = 1; break;
1702 case 'r': show_rpath = 1; break;
1703 case 'n': show_needed = 1; break;
1704 case 'i': show_interp = 1; break;
1705 case 'b': show_bind = 1; break;
1706 case 'S': show_soname = 1; break;
1707 case 'T': show_textrels = 1; break;
1708 default:
1709 err("Invalid format specifier '%c' (byte %i)",
1710 out_format[i], i+1);
1711 }
1712 }
1713
1714 /* construct our default format */
1715 } else {
1716 size_t fmt_len = 30;
1717 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1718 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1719 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1720 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1721 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1722 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1723 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1724 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1725 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1726 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1727 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1728 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1729 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
1730 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1731 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1732 }
1733 if (be_verbose > 2) printf("Format: %s\n", out_format);
1734
1735 /* now lets actually do the scanning */
1736 if (scan_ldpath || use_ldcache)
1737 #if defined(__GLIBC__) || defined(__UCLIBC__)
1738 load_ld_so_conf(0, "/etc/ld.so.conf");
1739 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1740 load_ld_so_hints(0, _PATH_ELF_HINTS);
1741 #endif
1742 if (scan_ldpath) scanelf_ldpath();
1743 if (scan_envpath) scanelf_envpath();
1744 if (!from_file && optind == argc && ttyname(0) == NULL)
1745 from_file = "-";
1746 if (from_file) {
1747 scanelf_from_file(from_file);
1748 from_file = *argv;
1749 }
1750 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1751 err("Nothing to scan !?");
1752 while (optind < argc) {
1753 search_path = argv[optind++];
1754 scanelf_dir(search_path);
1755 }
1756
1757 /* clean up */
1758 if (versioned_symname) free(versioned_symname);
1759 for (i = 0; ldpaths[i]; ++i)
1760 free(ldpaths[i]);
1761
1762 if (ldcache != 0)
1763 munmap(ldcache, ldcache_size);
1764 }
1765
1766
1767
1768 /* utility funcs */
1769 static char *xstrdup(const char *s)
1770 {
1771 char *ret = strdup(s);
1772 if (!ret) err("Could not strdup(): %s", strerror(errno));
1773 return ret;
1774 }
1775 static void *xmalloc(size_t size)
1776 {
1777 void *ret = malloc(size);
1778 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1779 return ret;
1780 }
1781 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1782 {
1783 size_t new_len;
1784
1785 new_len = strlen(*dst) + strlen(src);
1786 if (*curr_len <= new_len) {
1787 *curr_len = new_len + (*curr_len / 2);
1788 *dst = realloc(*dst, *curr_len);
1789 if (!*dst)
1790 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1791 }
1792
1793 if (n)
1794 strncat(*dst, src, n);
1795 else
1796 strcat(*dst, src);
1797 }
1798 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1799 {
1800 static char my_app[2];
1801 my_app[0] = append;
1802 my_app[1] = '\0';
1803 xstrcat(dst, my_app, curr_len);
1804 }
1805
1806
1807
1808 int main(int argc, char *argv[])
1809 {
1810 if (argc < 2)
1811 usage(EXIT_FAILURE);
1812 parseargs(argc, argv);
1813 fclose(stdout);
1814 #ifdef __BOUNDS_CHECKING_ON
1815 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1816 #endif
1817 return EXIT_SUCCESS;
1818 }

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