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Revision 1.245 - (hide annotations) (download) (as text)
Sat Aug 4 06:08:25 2012 UTC (23 months, 3 weeks ago) by vapier
Branch: MAIN
Changes since 1.244: +8 -3 lines
File MIME type: text/x-csrc
scanelf: add warnings when we cannot open an elf #427640 by Anthony Basile

1 solar 1.1 /*
2 solar 1.178 * Copyright 2003-2007 Gentoo Foundation
3 solar 1.1 * Distributed under the terms of the GNU General Public License v2
4 vapier 1.245 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.244 2012/04/29 06:21:36 vapier Exp $
5 solar 1.1 *
6 solar 1.179 * Copyright 2003-2007 Ned Ludd - <solar@gentoo.org>
7     * Copyright 2004-2007 Mike Frysinger - <vapier@gentoo.org>
8 solar 1.1 */
9    
10 vapier 1.245 static const char rcsid[] = "$Id: scanelf.c,v 1.244 2012/04/29 06:21:36 vapier Exp $";
11 vapier 1.220 const char argv0[] = "scanelf";
12 vapier 1.186
13 vapier 1.89 #include "paxinc.h"
14 flameeyes 1.141
15 solar 1.132 #define IS_MODIFIER(c) (c == '%' || c == '#' || c == '+')
16 vapier 1.70
17 vapier 1.10 /* prototypes */
18 kevquinn 1.142 static int file_matches_list(const char *filename, char **matchlist);
19 vapier 1.10
20     /* variables to control behavior */
21 vapier 1.228 static char *match_etypes = NULL;
22 vapier 1.227 static array_t _ldpaths = array_init_decl, *ldpaths = &_ldpaths;
23 vapier 1.10 static char scan_ldpath = 0;
24     static char scan_envpath = 0;
25 vapier 1.37 static char scan_symlink = 1;
26 vapier 1.105 static char scan_archives = 0;
27 vapier 1.10 static char dir_recurse = 0;
28 vapier 1.14 static char dir_crossmount = 1;
29 vapier 1.10 static char show_pax = 0;
30 solar 1.180 static char show_perms = 0;
31 solar 1.190 static char show_size = 0;
32 solar 1.73 static char show_phdr = 0;
33 vapier 1.10 static char show_textrel = 0;
34     static char show_rpath = 0;
35 vapier 1.32 static char show_needed = 0;
36 vapier 1.38 static char show_interp = 0;
37 vapier 1.49 static char show_bind = 0;
38 vapier 1.84 static char show_soname = 0;
39 vapier 1.76 static char show_textrels = 0;
40 solar 1.16 static char show_banner = 1;
41 solar 1.181 static char show_endian = 0;
42 solar 1.191 static char show_osabi = 0;
43     static char show_eabi = 0;
44 vapier 1.10 static char be_quiet = 0;
45 vapier 1.14 static char be_verbose = 0;
46 solar 1.127 static char be_wewy_wewy_quiet = 0;
47 solar 1.132 static char be_semi_verbose = 0;
48 flameeyes 1.198 static char *find_sym = NULL;
49 vapier 1.72 static char *find_lib = NULL;
50 vapier 1.226 static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
51 solar 1.124 static char *find_section = NULL;
52 vapier 1.226 static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
53 vapier 1.39 static char *out_format = NULL;
54 vapier 1.66 static char *search_path = NULL;
55 vapier 1.101 static char fix_elf = 0;
56 solar 1.176 static char g_match = 0;
57 vapier 1.102 static char use_ldcache = 0;
58 vapier 1.240 static char use_ldpath = 0;
59 solar 1.1
60 kevquinn 1.142 static char **qa_textrels = NULL;
61     static char **qa_execstack = NULL;
62 kevquinn 1.145 static char **qa_wx_load = NULL;
63 vapier 1.232 static int root_fd = AT_FDCWD;
64 kevquinn 1.142
65 vapier 1.203 static int match_bits = 0;
66     static unsigned int match_perms = 0;
67 vapier 1.212 static void *ldcache = NULL;
68 vapier 1.203 static size_t ldcache_size = 0;
69     static unsigned long setpax = 0UL;
70 solar 1.96
71 vapier 1.203 static int has_objdump = 0;
72 solar 1.175
73 solar 1.174 /* find the path to a file by name */
74 vapier 1.230 static int bin_in_path(const char *fname)
75 solar 1.170 {
76 vapier 1.230 char fullpath[__PAX_UTILS_PATH_MAX];
77 vapier 1.172 char *path, *p;
78 solar 1.170
79 vapier 1.172 path = getenv("PATH");
80     if (!path)
81 vapier 1.230 return 0;
82 solar 1.170
83 vapier 1.172 while ((p = strrchr(path, ':')) != NULL) {
84 solar 1.170 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
85 vapier 1.172 *p = 0;
86 vapier 1.230 if (access(fullpath, R_OK) != -1)
87     return 1;
88 vapier 1.172 }
89 vapier 1.230
90     return 0;
91 solar 1.170 }
92 vapier 1.152
93 vapier 1.232 static FILE *fopenat_r(int dir_fd, const char *path)
94     {
95     int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
96     if (fd == -1)
97     return NULL;
98     return fdopen(fd, "re");
99     }
100    
101     static const char *root_rel_path(const char *path)
102     {
103     /*
104     * openat() will ignore the dirfd if path starts with
105     * a /, so consume all of that noise
106     *
107     * XXX: we don't handle relative paths like ../ that
108     * break out of the --root option, but for now, just
109     * don't do that :P.
110     */
111     if (root_fd != AT_FDCWD) {
112     while (*path == '/')
113     ++path;
114     if (*path == '\0')
115     path = ".";
116     }
117    
118     return path;
119     }
120    
121 solar 1.175 /* 1 on failure. 0 otherwise */
122 solar 1.174 static int rematch(const char *regex, const char *match, int cflags)
123     {
124     regex_t preg;
125     int ret;
126    
127     if ((match == NULL) || (regex == NULL))
128     return EXIT_FAILURE;
129    
130     if ((ret = regcomp(&preg, regex, cflags))) {
131     char err[256];
132    
133     if (regerror(ret, &preg, err, sizeof(err)))
134     fprintf(stderr, "regcomp failed: %s", err);
135     else
136     fprintf(stderr, "regcomp failed");
137    
138     return EXIT_FAILURE;
139     }
140     ret = regexec(&preg, match, 0, NULL, 0);
141     regfree(&preg);
142    
143     return ret;
144     }
145    
146 vapier 1.232 /* sub-funcs for scanelf_fileat() */
147 vapier 1.234 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
148 vapier 1.77 {
149     /* find the best SHT_DYNSYM and SHT_STRTAB sections */
150 vapier 1.213
151     /* debug sections */
152     void *symtab = elf_findsecbyname(elf, ".symtab");
153     void *strtab = elf_findsecbyname(elf, ".strtab");
154     /* runtime sections */
155     void *dynsym = elf_findsecbyname(elf, ".dynsym");
156     void *dynstr = elf_findsecbyname(elf, ".dynstr");
157    
158 vapier 1.244 /*
159     * If the sections are marked NOBITS, then they don't exist, so we just
160     * skip them. This let's us work sanely with splitdebug ELFs (rather
161     * than spewing a lot of "corrupt ELF" messages later on). In malformed
162     * ELFs, the section might be wrongly set to NOBITS, but screw em.
163     */
164 vapier 1.77 #define GET_SYMTABS(B) \
165     if (elf->elf_class == ELFCLASS ## B) { \
166 vapier 1.244 Elf ## B ## _Shdr *esymtab = symtab; \
167     Elf ## B ## _Shdr *estrtab = strtab; \
168     Elf ## B ## _Shdr *edynsym = dynsym; \
169     Elf ## B ## _Shdr *edynstr = dynstr; \
170     \
171     if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
172     symtab = NULL; \
173     if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
174     dynsym = NULL; \
175     if (symtab && dynsym) \
176 vapier 1.213 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
177 vapier 1.244 else \
178 vapier 1.213 *sym = symtab ? symtab : dynsym; \
179 vapier 1.244 \
180     if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
181     strtab = NULL; \
182     if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
183     dynstr = NULL; \
184     if (strtab && dynstr) \
185 vapier 1.234 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
186 vapier 1.244 else \
187 vapier 1.234 *str = strtab ? strtab : dynstr; \
188 vapier 1.77 }
189     GET_SYMTABS(32)
190     GET_SYMTABS(64)
191 vapier 1.234
192     if (*sym && *str)
193     return;
194    
195     /*
196     * damn, they're really going to make us work for it huh?
197     * reconstruct the section header info out of the dynamic
198     * tags so we can see what symbols this guy uses at runtime.
199     */
200     #define GET_SYMTABS_DT(B) \
201     if (elf->elf_class == ELFCLASS ## B) { \
202     size_t i; \
203     static Elf ## B ## _Shdr sym_shdr, str_shdr; \
204     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
205     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
206     Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
207     Elf ## B ## _Dyn *dyn; \
208     Elf ## B ## _Off offset; \
209     \
210     /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
211     vsym = vstr = vhash = vgnu_hash = 0; \
212     memset(&sym_shdr, 0, sizeof(sym_shdr)); \
213     memset(&str_shdr, 0, sizeof(str_shdr)); \
214     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
215     if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
216     continue; \
217     \
218     offset = EGET(phdr[i].p_offset); \
219     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
220     continue; \
221     \
222     dyn = DYN ## B (elf->vdata + offset); \
223     while (EGET(dyn->d_tag) != DT_NULL) { \
224     switch (EGET(dyn->d_tag)) { \
225     case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
226     case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
227     case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
228     case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
229     case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
230     /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
231     } \
232     ++dyn; \
233     } \
234     if (vsym && vstr) \
235     break; \
236     } \
237     if (!vsym || !vstr || !(vhash || vgnu_hash)) \
238     return; \
239     \
240     /* calc offset into the ELF by finding the load addr of the syms */ \
241     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
242     Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
243     Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
244     offset = EGET(phdr[i].p_offset); \
245     \
246     if (EGET(phdr[i].p_type) != PT_LOAD) \
247     continue; \
248     \
249     if (vhash >= vaddr && vhash < vaddr + filesz) { \
250     /* Scan the hash table to see how many entries we have */ \
251     Elf32_Word max_sym_idx = 0; \
252     Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
253     Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
254     Elf32_Word nchains = EGET(hashtbl[1]); \
255     Elf32_Word *buckets = &hashtbl[2]; \
256     Elf32_Word *chains = &buckets[nbuckets]; \
257     Elf32_Word sym_idx; \
258     \
259     for (b = 0; b < nbuckets; ++b) { \
260     if (!buckets[b]) \
261     continue; \
262     for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
263     if (max_sym_idx < sym_idx) \
264     max_sym_idx = sym_idx; \
265     } \
266     ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
267     } \
268     \
269     if (vsym >= vaddr && vsym < vaddr + filesz) { \
270     ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
271     *sym = &sym_shdr; \
272     } \
273     \
274     if (vstr >= vaddr && vstr < vaddr + filesz) { \
275     ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
276     *str = &str_shdr; \
277     } \
278     } \
279     }
280     GET_SYMTABS_DT(32)
281     GET_SYMTABS_DT(64)
282 vapier 1.77 }
283 solar 1.127
284 vapier 1.41 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
285 solar 1.6 {
286 solar 1.61 static char ret[7];
287     unsigned long i, shown;
288    
289 vapier 1.41 if (!show_pax) return NULL;
290 vapier 1.10
291 solar 1.61 shown = 0;
292     memset(&ret, 0, sizeof(ret));
293    
294     if (elf->phdr) {
295     #define SHOW_PAX(B) \
296     if (elf->elf_class == ELFCLASS ## B) { \
297     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
298     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
299     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
300     if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
301     continue; \
302 solar 1.127 if (fix_elf && setpax) { \
303     /* set the paxctl flags */ \
304     ESET(phdr[i].p_flags, setpax); \
305     } \
306 solar 1.129 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
307 solar 1.61 continue; \
308     memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
309     *found_pax = 1; \
310     ++shown; \
311     break; \
312     } \
313     }
314     SHOW_PAX(32)
315     SHOW_PAX(64)
316     }
317    
318 vapier 1.242 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
319     * was found. This is known to break ELFs on glibc systems,
320     * and mainline PaX has deprecated use of this for a long time.
321     * We could support changing PT_GNU_STACK, but that doesn't
322     * seem like it's worth the effort. #411919
323     */
324 solar 1.128
325 solar 1.61 /* fall back to EI_PAX if no PT_PAX was found */
326     if (!*ret) {
327 vapier 1.90 static char *paxflags;
328 solar 1.61 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
329     if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
330     *found_pax = 1;
331 solar 1.127 return (be_wewy_wewy_quiet ? NULL : paxflags);
332 solar 1.61 }
333     strncpy(ret, paxflags, sizeof(ret));
334 vapier 1.14 }
335 vapier 1.41
336 solar 1.127 if (be_wewy_wewy_quiet || (be_quiet && !shown))
337 solar 1.61 return NULL;
338 vapier 1.90 else
339     return ret;
340     }
341 solar 1.61
342 solar 1.73 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
343 vapier 1.39 {
344 vapier 1.71 static char ret[12];
345 vapier 1.41 char *found;
346 vapier 1.99 unsigned long i, shown, multi_stack, multi_relro, multi_load;
347     int max_pt_load;
348 vapier 1.41
349 solar 1.73 if (!show_phdr) return NULL;
350 vapier 1.41
351 vapier 1.71 memcpy(ret, "--- --- ---\0", 12);
352    
353 vapier 1.41 shown = 0;
354 vapier 1.71 multi_stack = multi_relro = multi_load = 0;
355 vapier 1.99 max_pt_load = elf_max_pt_load(elf);
356 vapier 1.44
357 vapier 1.108 #define NOTE_GNU_STACK ".note.GNU-stack"
358 solar 1.73 #define SHOW_PHDR(B) \
359 vapier 1.39 if (elf->elf_class == ELFCLASS ## B) { \
360     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
361 vapier 1.91 Elf ## B ## _Off offset; \
362     uint32_t flags, check_flags; \
363     if (elf->phdr != NULL) { \
364     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
365     for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
366     if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
367 vapier 1.152 if (multi_stack++) \
368     warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
369     if (file_matches_list(elf->filename, qa_execstack)) \
370     continue; \
371     found = found_phdr; \
372     offset = 0; \
373     check_flags = PF_X; \
374 vapier 1.91 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
375 vapier 1.152 if (multi_relro++) \
376     warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
377 vapier 1.91 found = found_relro; \
378     offset = 4; \
379     check_flags = PF_X; \
380     } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
381 solar 1.188 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
382 vapier 1.152 if (multi_load++ > max_pt_load) \
383     warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
384     if (file_matches_list(elf->filename, qa_wx_load)) \
385     continue; \
386     found = found_load; \
387     offset = 8; \
388     check_flags = PF_W|PF_X; \
389 vapier 1.91 } else \
390     continue; \
391     flags = EGET(phdr[i].p_flags); \
392     if (be_quiet && ((flags & check_flags) != check_flags)) \
393     continue; \
394 solar 1.130 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
395 vapier 1.101 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
396     ret[3] = ret[7] = '!'; \
397     flags = EGET(phdr[i].p_flags); \
398     } \
399 vapier 1.91 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
400     *found = 1; \
401     ++shown; \
402     } \
403     } else if (elf->shdr != NULL) { \
404     /* no program headers which means this is prob an object file */ \
405     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
406     Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
407 vapier 1.108 char *str; \
408 vapier 1.217 if ((void*)strtbl > elf->data_end) \
409 vapier 1.108 goto skip_this_shdr##B; \
410 vapier 1.91 check_flags = SHF_WRITE|SHF_EXECINSTR; \
411     for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
412     if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
413     offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
414 vapier 1.108 str = elf->data + offset; \
415     if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
416     if (!strcmp(str, NOTE_GNU_STACK)) { \
417 vapier 1.91 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
418     flags = EGET(shdr[i].sh_flags); \
419     if (be_quiet && ((flags & check_flags) != check_flags)) \
420     continue; \
421     ++*found_phdr; \
422     shown = 1; \
423     if (flags & SHF_WRITE) ret[0] = 'W'; \
424     if (flags & SHF_ALLOC) ret[1] = 'A'; \
425     if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
426     if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
427     break; \
428     } \
429     } \
430 vapier 1.108 skip_this_shdr##B: \
431 vapier 1.91 if (!multi_stack) { \
432 vapier 1.158 if (file_matches_list(elf->filename, qa_execstack)) \
433     return NULL; \
434 vapier 1.91 *found_phdr = 1; \
435     shown = 1; \
436     memcpy(ret, "!WX", 3); \
437     } \
438 vapier 1.39 } \
439     }
440 solar 1.73 SHOW_PHDR(32)
441     SHOW_PHDR(64)
442 vapier 1.44
443 solar 1.127 if (be_wewy_wewy_quiet || (be_quiet && !shown))
444 vapier 1.41 return NULL;
445     else
446     return ret;
447 vapier 1.39 }
448 kevquinn 1.142
449 vapier 1.186 /*
450     * See if this ELF contains a DT_TEXTREL tag in any of its
451     * PT_DYNAMIC sections.
452     */
453 vapier 1.90 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
454 vapier 1.39 {
455 vapier 1.90 static const char *ret = "TEXTREL";
456 vapier 1.44 unsigned long i;
457 vapier 1.41
458 vapier 1.79 if (!show_textrel && !show_textrels) return NULL;
459 vapier 1.41
460 kevquinn 1.142 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
461    
462 vapier 1.44 if (elf->phdr) {
463 vapier 1.39 #define SHOW_TEXTREL(B) \
464     if (elf->elf_class == ELFCLASS ## B) { \
465     Elf ## B ## _Dyn *dyn; \
466     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
467     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
468 vapier 1.44 Elf ## B ## _Off offset; \
469 vapier 1.39 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
470 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
471 vapier 1.44 offset = EGET(phdr[i].p_offset); \
472     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
473 vapier 1.217 dyn = DYN ## B (elf->vdata + offset); \
474 vapier 1.39 while (EGET(dyn->d_tag) != DT_NULL) { \
475     if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
476     *found_textrel = 1; \
477     /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
478 solar 1.127 return (be_wewy_wewy_quiet ? NULL : ret); \
479 vapier 1.39 } \
480     ++dyn; \
481 vapier 1.26 } \
482 vapier 1.39 } }
483     SHOW_TEXTREL(32)
484     SHOW_TEXTREL(64)
485 vapier 1.44 }
486    
487 solar 1.127 if (be_quiet || be_wewy_wewy_quiet)
488 vapier 1.41 return NULL;
489     else
490 vapier 1.90 return " - ";
491 vapier 1.39 }
492 solar 1.180
493 vapier 1.186 /*
494     * Scan the .text section to see if there are any relocations in it.
495     * Should rewrite this to check PT_LOAD sections that are marked
496     * Executable rather than the section named '.text'.
497     */
498 vapier 1.79 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
499 vapier 1.76 {
500 vapier 1.82 unsigned long s, r, rmax;
501     void *symtab_void, *strtab_void, *text_void;
502 vapier 1.76
503     if (!show_textrels) return NULL;
504    
505 vapier 1.79 /* don't search for TEXTREL's if the ELF doesn't have any */
506     if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
507     if (!*found_textrel) return NULL;
508    
509 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
510 vapier 1.82 text_void = elf_findsecbyname(elf, ".text");
511 vapier 1.76
512 vapier 1.82 if (symtab_void && strtab_void && text_void && elf->shdr) {
513 vapier 1.76 #define SHOW_TEXTRELS(B) \
514     if (elf->elf_class == ELFCLASS ## B) { \
515     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
516     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
517     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
518     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
519 vapier 1.82 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
520     Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
521     uint ## B ## _t memsz = EGET(text->sh_size); \
522 vapier 1.76 Elf ## B ## _Rel *rel; \
523     Elf ## B ## _Rela *rela; \
524     /* search the section headers for relocations */ \
525     for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
526     uint32_t sh_type = EGET(shdr[s].sh_type); \
527     if (sh_type == SHT_REL) { \
528 vapier 1.217 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
529 vapier 1.76 rela = NULL; \
530     rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
531     } else if (sh_type == SHT_RELA) { \
532     rel = NULL; \
533 vapier 1.217 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
534 vapier 1.76 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
535     } else \
536     continue; \
537 vapier 1.82 /* now see if any of the relocs are in the .text */ \
538     for (r = 0; r < rmax; ++r) { \
539     unsigned long sym_max; \
540     Elf ## B ## _Addr offset_tmp; \
541     Elf ## B ## _Sym *func; \
542     Elf ## B ## _Sym *sym; \
543     Elf ## B ## _Addr r_offset; \
544     uint ## B ## _t r_info; \
545     if (sh_type == SHT_REL) { \
546     r_offset = EGET(rel[r].r_offset); \
547     r_info = EGET(rel[r].r_info); \
548     } else { \
549     r_offset = EGET(rela[r].r_offset); \
550     r_info = EGET(rela[r].r_info); \
551     } \
552     /* make sure this relocation is inside of the .text */ \
553     if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
554     if (be_verbose <= 2) continue; \
555     } else \
556 vapier 1.78 *found_textrels = 1; \
557 vapier 1.82 /* locate this relocation symbol name */ \
558 vapier 1.217 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
559     if ((void*)sym > elf->data_end) { \
560 vapier 1.111 warn("%s: corrupt ELF symbol", elf->filename); \
561 vapier 1.109 continue; \
562     } \
563 vapier 1.82 sym_max = ELF ## B ## _R_SYM(r_info); \
564     if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
565     sym += sym_max; \
566     else \
567     sym = NULL; \
568     sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
569     /* show the raw details about this reloc */ \
570 vapier 1.88 printf(" %s: ", elf->base_filename); \
571 vapier 1.82 if (sym && sym->st_name) \
572 vapier 1.217 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
573 vapier 1.82 else \
574 vapier 1.169 printf("(memory/data?)"); \
575 vapier 1.82 printf(" [0x%lX]", (unsigned long)r_offset); \
576     /* now try to find the closest symbol that this rel is probably in */ \
577 vapier 1.217 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
578 vapier 1.82 func = NULL; \
579     offset_tmp = 0; \
580     while (sym_max--) { \
581     if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
582     func = sym; \
583     offset_tmp = EGET(sym->st_value); \
584 vapier 1.76 } \
585 vapier 1.82 ++sym; \
586 vapier 1.76 } \
587 vapier 1.82 printf(" in "); \
588 vapier 1.169 if (func && func->st_name) { \
589     const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
590     if (r_offset > EGET(func->st_size)) \
591     printf("(optimized out: previous %s)", func_name); \
592     else \
593     printf("%s", func_name); \
594     } else \
595     printf("(optimized out)"); \
596 vapier 1.82 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
597 solar 1.170 if (be_verbose && has_objdump) { \
598 vapier 1.187 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
599 vapier 1.167 char *sysbuf; \
600     size_t syslen; \
601     const char sysfmt[] = "objdump -r -R -d -w -l --start-address=0x%lX --stop-address=0x%lX %s | grep --color -i -C 3 '.*[[:space:]]%lX:[[:space:]]*R_.*'\n"; \
602     syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
603     sysbuf = xmalloc(syslen); \
604 vapier 1.187 if (end_addr < r_offset) \
605     /* not uncommon when things are optimized out */ \
606     end_addr = r_offset + 0x100; \
607     snprintf(sysbuf, syslen, sysfmt, \
608     (unsigned long)offset_tmp, \
609     (unsigned long)end_addr, \
610     elf->filename, \
611     (unsigned long)r_offset); \
612     fflush(stdout); \
613 vapier 1.232 if (system(sysbuf)) /* don't care */; \
614 vapier 1.187 fflush(stdout); \
615     free(sysbuf); \
616 vapier 1.167 } \
617 vapier 1.76 } \
618     } }
619     SHOW_TEXTRELS(32)
620     SHOW_TEXTRELS(64)
621     }
622 vapier 1.82 if (!*found_textrels)
623     warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
624 vapier 1.76
625     return NULL;
626     }
627 solar 1.83
628 vapier 1.102 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
629 vapier 1.100 {
630 solar 1.83 struct stat st;
631 vapier 1.84 switch (*item) {
632 vapier 1.89 case '/': break;
633     case '.':
634 vapier 1.102 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
635 vapier 1.89 break;
636 vapier 1.100 case ':':
637 vapier 1.89 case '\0':
638 vapier 1.102 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
639 solar 1.83 break;
640     case '$':
641 vapier 1.84 if (fstat(elf->fd, &st) != -1)
642 solar 1.83 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
643 vapier 1.157 warnf("Security problem with %s='%s' in %s with mode set of %o",
644 solar 1.176 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
645 solar 1.83 break;
646     default:
647 vapier 1.102 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
648 solar 1.83 break;
649     }
650     }
651 vapier 1.41 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
652 vapier 1.39 {
653 vapier 1.227 unsigned long i;
654 vapier 1.48 char *rpath, *runpath, **r;
655 vapier 1.39 void *strtbl_void;
656 vapier 1.10
657 vapier 1.39 if (!show_rpath) return;
658 vapier 1.10
659 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
660     rpath = runpath = NULL;
661 vapier 1.10
662 vapier 1.44 if (elf->phdr && strtbl_void) {
663 vapier 1.26 #define SHOW_RPATH(B) \
664     if (elf->elf_class == ELFCLASS ## B) { \
665     Elf ## B ## _Dyn *dyn; \
666     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
667     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
668     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
669 vapier 1.44 Elf ## B ## _Off offset; \
670 vapier 1.60 Elf ## B ## _Xword word; \
671 vapier 1.48 /* Scan all the program headers */ \
672 vapier 1.26 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
673 vapier 1.48 /* Just scan dynamic headers */ \
674 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
675 vapier 1.44 offset = EGET(phdr[i].p_offset); \
676     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
677 vapier 1.48 /* Just scan dynamic RPATH/RUNPATH headers */ \
678 vapier 1.217 dyn = DYN ## B (elf->vdata + offset); \
679 vapier 1.48 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
680     if (word == DT_RPATH) { \
681     r = &rpath; \
682     } else if (word == DT_RUNPATH) { \
683     r = &runpath; \
684     } else { \
685     ++dyn; \
686     continue; \
687     } \
688     /* Verify the memory is somewhat sane */ \
689     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
690 vapier 1.69 if (offset < (Elf ## B ## _Off)elf->len) { \
691 vapier 1.48 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
692 vapier 1.217 *r = elf->data + offset; \
693 vapier 1.103 /* cache the length in case we need to nuke this section later on */ \
694     if (fix_elf) \
695     offset = strlen(*r); \
696 vapier 1.48 /* If quiet, don't output paths in ld.so.conf */ \
697 vapier 1.69 if (be_quiet) { \
698     size_t len; \
699     char *start, *end; \
700 vapier 1.75 /* note that we only 'chop' off leading known paths. */ \
701     /* since *r is read-only memory, we can only move the ptr forward. */ \
702     start = *r; \
703     /* scan each path in : delimited list */ \
704     while (start) { \
705 vapier 1.102 rpath_security_checks(elf, start, get_elfdtype(word)); \
706 vapier 1.69 end = strchr(start, ':'); \
707 vapier 1.75 len = (end ? abs(end - start) : strlen(start)); \
708 vapier 1.227 if (use_ldcache) { \
709     size_t n; \
710     const char *ldpath; \
711     array_for_each(ldpaths, n, ldpath) \
712     if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
713 vapier 1.102 *r = end; \
714     /* corner case ... if RPATH reads "/usr/lib:", we want \
715     * to show ':' rather than '' */ \
716     if (end && end[1] != '\0') \
717     (*r)++; \
718     break; \
719     } \
720 vapier 1.227 } \
721 vapier 1.100 if (!*r || !end) \
722     break; \
723 vapier 1.75 else \
724     start = start + len + 1; \
725 vapier 1.69 } \
726     } \
727 vapier 1.101 if (*r) { \
728 solar 1.107 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
729 vapier 1.101 /* just nuke it */ \
730     nuke_it##B: \
731 vapier 1.103 memset(*r, 0x00, offset); \
732 vapier 1.102 *r = NULL; \
733 vapier 1.101 ESET(dyn->d_tag, DT_DEBUG); \
734 vapier 1.103 ESET(dyn->d_un.d_ptr, 0); \
735 vapier 1.101 } else if (fix_elf) { \
736     /* try to clean "bad" paths */ \
737     size_t len, tmpdir_len; \
738     char *start, *end; \
739     const char *tmpdir; \
740     start = *r; \
741     tmpdir = (getenv("TMPDIR") ? : "."); \
742     tmpdir_len = strlen(tmpdir); \
743     while (1) { \
744     end = strchr(start, ':'); \
745     if (start == end) { \
746     eat_this_path##B: \
747     len = strlen(end); \
748     memmove(start, end+1, len); \
749     start[len-1] = '\0'; \
750     end = start - 1; \
751     } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
752     if (!end) { \
753     if (start == *r) \
754     goto nuke_it##B; \
755     *--start = '\0'; \
756     } else \
757     goto eat_this_path##B; \
758     } \
759     if (!end) \
760     break; \
761     start = end + 1; \
762     } \
763 vapier 1.102 if (**r == '\0') \
764     goto nuke_it##B; \
765 vapier 1.101 } \
766 vapier 1.102 if (*r) \
767     *found_rpath = 1; \
768 vapier 1.101 } \
769 vapier 1.26 } \
770     ++dyn; \
771     } \
772     } }
773     SHOW_RPATH(32)
774     SHOW_RPATH(64)
775 vapier 1.10 }
776 vapier 1.41
777 solar 1.127 if (be_wewy_wewy_quiet) return;
778 vapier 1.70
779 vapier 1.39 if (rpath && runpath) {
780 vapier 1.41 if (!strcmp(rpath, runpath)) {
781     xstrcat(ret, runpath, ret_len);
782     } else {
783 vapier 1.39 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
784 vapier 1.41 xchrcat(ret, '{', ret_len);
785     xstrcat(ret, rpath, ret_len);
786     xchrcat(ret, ',', ret_len);
787     xstrcat(ret, runpath, ret_len);
788     xchrcat(ret, '}', ret_len);
789 vapier 1.39 }
790     } else if (rpath || runpath)
791 vapier 1.41 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
792     else if (!be_quiet)
793     xstrcat(ret, " - ", ret_len);
794 vapier 1.39 }
795 solar 1.96
796     #define LDSO_CACHE_MAGIC "ld.so-"
797     #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
798     #define LDSO_CACHE_VER "1.7.0"
799     #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
800 vapier 1.97 #define FLAG_ANY -1
801     #define FLAG_TYPE_MASK 0x00ff
802     #define FLAG_LIBC4 0x0000
803     #define FLAG_ELF 0x0001
804     #define FLAG_ELF_LIBC5 0x0002
805     #define FLAG_ELF_LIBC6 0x0003
806     #define FLAG_REQUIRED_MASK 0xff00
807     #define FLAG_SPARC_LIB64 0x0100
808     #define FLAG_IA64_LIB64 0x0200
809     #define FLAG_X8664_LIB64 0x0300
810     #define FLAG_S390_LIB64 0x0400
811     #define FLAG_POWERPC_LIB64 0x0500
812     #define FLAG_MIPS64_LIBN32 0x0600
813     #define FLAG_MIPS64_LIBN64 0x0700
814 solar 1.96
815 flameeyes 1.141 #if defined(__GLIBC__) || defined(__UCLIBC__)
816 vapier 1.148
817 vapier 1.240 static char *lookup_cache_lib(elfobj *elf, const char *fname)
818 solar 1.96 {
819 vapier 1.212 int fd;
820 solar 1.96 char *strs;
821 vapier 1.104 static char buf[__PAX_UTILS_PATH_MAX] = "";
822 vapier 1.232 const char *cachefile = root_rel_path("/etc/ld.so.cache");
823 solar 1.96 struct stat st;
824    
825     typedef struct {
826     char magic[LDSO_CACHE_MAGIC_LEN];
827     char version[LDSO_CACHE_VER_LEN];
828     int nlibs;
829     } header_t;
830 vapier 1.97 header_t *header;
831 solar 1.96
832     typedef struct {
833     int flags;
834     int sooffset;
835     int liboffset;
836     } libentry_t;
837     libentry_t *libent;
838    
839     if (fname == NULL)
840     return NULL;
841    
842 vapier 1.212 if (ldcache == NULL) {
843 vapier 1.232 if (fstatat(root_fd, cachefile, &st, 0))
844 vapier 1.212 return NULL;
845    
846 vapier 1.232 fd = openat(root_fd, cachefile, O_RDONLY);
847 vapier 1.212 if (fd == -1)
848 solar 1.96 return NULL;
849 vapier 1.97
850     /* cache these values so we only map/unmap the cache file once */
851 solar 1.96 ldcache_size = st.st_size;
852 vapier 1.212 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
853 vapier 1.97 close(fd);
854 solar 1.96
855 vapier 1.202 if (ldcache == MAP_FAILED) {
856 vapier 1.212 ldcache = NULL;
857 solar 1.96 return NULL;
858 solar 1.116 }
859 solar 1.96
860 vapier 1.212 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
861     memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
862     {
863     munmap(ldcache, ldcache_size);
864     ldcache = NULL;
865 solar 1.96 return NULL;
866 vapier 1.212 }
867     } else
868     header = ldcache;
869 solar 1.96
870 vapier 1.212 libent = ldcache + sizeof(header_t);
871 solar 1.96 strs = (char *) &libent[header->nlibs];
872    
873 vapier 1.212 for (fd = 0; fd < header->nlibs; ++fd) {
874     /* This should be more fine grained, but for now we assume that
875     * diff arches will not be cached together, and we ignore the
876     * the different multilib mips cases.
877     */
878 vapier 1.97 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
879     continue;
880     if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
881     continue;
882    
883 solar 1.96 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
884     continue;
885 vapier 1.212
886     /* Return first hit because that is how the ldso rolls */
887 solar 1.96 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
888 vapier 1.212 break;
889 solar 1.96 }
890 vapier 1.212
891 solar 1.96 return buf;
892     }
893 vapier 1.212
894 solar 1.154 #elif defined(__NetBSD__)
895 vapier 1.240 static char *lookup_cache_lib(elfobj *elf, const char *fname)
896 solar 1.154 {
897     static char buf[__PAX_UTILS_PATH_MAX] = "";
898     static struct stat st;
899 vapier 1.227 size_t n;
900     char *ldpath;
901 solar 1.154
902 vapier 1.227 array_for_each(ldpath, n, ldpath) {
903     if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
904 solar 1.154 continue; /* if the pathname is too long, or something went wrong, ignore */
905    
906     if (stat(buf, &st) != 0)
907     continue; /* if the lib doesn't exist in *ldpath, look further */
908    
909     /* NetBSD doesn't actually do sanity checks, it just loads the file
910     * and if that doesn't work, continues looking in other directories.
911     * This cannot easily be safely emulated, unfortunately. For now,
912     * just assume that if it exists, it's a valid library. */
913 vapier 1.148
914 solar 1.154 return buf;
915     }
916    
917     /* not found in any path */
918     return NULL;
919     }
920 flameeyes 1.141 #else
921 vapier 1.192 #ifdef __ELF__
922 vapier 1.148 #warning Cache support not implemented for your target
923 vapier 1.192 #endif
924 vapier 1.240 static char *lookup_cache_lib(elfobj *elf, const char *fname)
925 flameeyes 1.141 {
926     return NULL;
927     }
928     #endif
929 solar 1.96
930 vapier 1.240 static char *lookup_config_lib(elfobj *elf, char *fname)
931     {
932     static char buf[__PAX_UTILS_PATH_MAX] = "";
933     const char *ldpath;
934     size_t n;
935    
936     array_for_each(ldpaths, n, ldpath) {
937     snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
938     if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
939     return buf;
940     }
941    
942     return NULL;
943     }
944    
945 vapier 1.84 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
946 vapier 1.39 {
947 vapier 1.44 unsigned long i;
948 vapier 1.39 char *needed;
949     void *strtbl_void;
950 solar 1.96 char *p;
951 vapier 1.39
952 vapier 1.226 /*
953     * -n -> op==0 -> print all
954     * -N -> op==1 -> print requested
955     */
956     if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
957     return NULL;
958 vapier 1.10
959 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
960 vapier 1.32
961 vapier 1.44 if (elf->phdr && strtbl_void) {
962 vapier 1.32 #define SHOW_NEEDED(B) \
963     if (elf->elf_class == ELFCLASS ## B) { \
964     Elf ## B ## _Dyn *dyn; \
965     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
966     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
967     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
968 vapier 1.44 Elf ## B ## _Off offset; \
969 vapier 1.226 size_t matched = 0; \
970     /* Walk all the program headers to find the PT_DYNAMIC */ \
971 vapier 1.32 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
972 vapier 1.226 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
973     continue; \
974 vapier 1.44 offset = EGET(phdr[i].p_offset); \
975 vapier 1.226 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
976     continue; \
977     /* Walk all the dynamic tags to find NEEDED entries */ \
978 vapier 1.217 dyn = DYN ## B (elf->vdata + offset); \
979 vapier 1.32 while (EGET(dyn->d_tag) != DT_NULL) { \
980     if (EGET(dyn->d_tag) == DT_NEEDED) { \
981 vapier 1.44 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
982 vapier 1.69 if (offset >= (Elf ## B ## _Off)elf->len) { \
983 vapier 1.49 ++dyn; \
984     continue; \
985     } \
986 vapier 1.217 needed = elf->data + offset; \
987 vapier 1.72 if (op == 0) { \
988 vapier 1.226 /* -n -> print all entries */ \
989 solar 1.127 if (!be_wewy_wewy_quiet) { \
990 vapier 1.72 if (*found_needed) xchrcat(ret, ',', ret_len); \
991 vapier 1.240 if (use_ldpath) { \
992     if ((p = lookup_config_lib(elf, needed)) != NULL) \
993     needed = p; \
994     } else if (use_ldcache) { \
995 vapier 1.97 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
996 solar 1.96 needed = p; \
997 vapier 1.240 } \
998 vapier 1.72 xstrcat(ret, needed, ret_len); \
999     } \
1000     *found_needed = 1; \
1001     } else { \
1002 vapier 1.226 /* -N -> print matching entries */ \
1003     size_t n; \
1004     const char *find_lib_name; \
1005     \
1006 vapier 1.236 array_for_each(find_lib_arr, n, find_lib_name) { \
1007     int invert = 1; \
1008     if (find_lib_name[0] == '!') \
1009     invert = 0, ++find_lib_name; \
1010     if (!strcmp(find_lib_name, needed) == invert) \
1011 vapier 1.226 ++matched; \
1012 vapier 1.236 } \
1013 vapier 1.226 \
1014     if (matched == array_cnt(find_lib_arr)) { \
1015 vapier 1.81 *found_lib = 1; \
1016 vapier 1.226 return (be_wewy_wewy_quiet ? NULL : find_lib); \
1017 vapier 1.81 } \
1018 vapier 1.72 } \
1019 vapier 1.32 } \
1020     ++dyn; \
1021     } \
1022     } }
1023     SHOW_NEEDED(32)
1024     SHOW_NEEDED(64)
1025 vapier 1.85 if (op == 0 && !*found_needed && be_verbose)
1026 vapier 1.84 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
1027 vapier 1.32 }
1028 vapier 1.72
1029     return NULL;
1030 vapier 1.39 }
1031 vapier 1.41 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1032 vapier 1.39 {
1033     void *strtbl_void;
1034    
1035 vapier 1.41 if (!show_interp) return NULL;
1036 vapier 1.32
1037 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".interp");
1038 vapier 1.38
1039 vapier 1.39 if (strtbl_void) {
1040 vapier 1.38 #define SHOW_INTERP(B) \
1041     if (elf->elf_class == ELFCLASS ## B) { \
1042 solar 1.40 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1043     *found_interp = 1; \
1044 solar 1.127 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1045 vapier 1.38 }
1046     SHOW_INTERP(32)
1047     SHOW_INTERP(64)
1048     }
1049 vapier 1.41 return NULL;
1050 vapier 1.39 }
1051 vapier 1.49 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
1052     {
1053     unsigned long i;
1054     struct stat s;
1055 solar 1.131 char dynamic = 0;
1056 vapier 1.49
1057     if (!show_bind) return NULL;
1058 vapier 1.51 if (!elf->phdr) return NULL;
1059 vapier 1.49
1060     #define SHOW_BIND(B) \
1061     if (elf->elf_class == ELFCLASS ## B) { \
1062     Elf ## B ## _Dyn *dyn; \
1063     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1064     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1065     Elf ## B ## _Off offset; \
1066     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1067 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1068 solar 1.131 dynamic = 1; \
1069 vapier 1.49 offset = EGET(phdr[i].p_offset); \
1070     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1071 vapier 1.217 dyn = DYN ## B (elf->vdata + offset); \
1072 vapier 1.49 while (EGET(dyn->d_tag) != DT_NULL) { \
1073     if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1074     (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1075     { \
1076     if (be_quiet) return NULL; \
1077     *found_bind = 1; \
1078 solar 1.127 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1079 vapier 1.49 } \
1080     ++dyn; \
1081     } \
1082     } \
1083     }
1084     SHOW_BIND(32)
1085     SHOW_BIND(64)
1086    
1087 solar 1.127 if (be_wewy_wewy_quiet) return NULL;
1088 vapier 1.70
1089 vapier 1.159 /* don't output anything if quiet mode and the ELF is static or not setuid */
1090     if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1091 vapier 1.49 return NULL;
1092     } else {
1093     *found_bind = 1;
1094 vapier 1.217 return (char *)(dynamic ? "LAZY" : "STATIC");
1095 vapier 1.49 }
1096     }
1097 vapier 1.84 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1098     {
1099     unsigned long i;
1100     char *soname;
1101     void *strtbl_void;
1102    
1103     if (!show_soname) return NULL;
1104    
1105     strtbl_void = elf_findsecbyname(elf, ".dynstr");
1106    
1107     if (elf->phdr && strtbl_void) {
1108     #define SHOW_SONAME(B) \
1109     if (elf->elf_class == ELFCLASS ## B) { \
1110     Elf ## B ## _Dyn *dyn; \
1111     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1112     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1113     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1114     Elf ## B ## _Off offset; \
1115     /* only look for soname in shared objects */ \
1116 solar 1.188 if (EGET(ehdr->e_type) != ET_DYN) \
1117 vapier 1.84 return NULL; \
1118     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1119 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1120 vapier 1.84 offset = EGET(phdr[i].p_offset); \
1121     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1122 vapier 1.217 dyn = DYN ## B (elf->vdata + offset); \
1123 vapier 1.84 while (EGET(dyn->d_tag) != DT_NULL) { \
1124     if (EGET(dyn->d_tag) == DT_SONAME) { \
1125     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1126     if (offset >= (Elf ## B ## _Off)elf->len) { \
1127     ++dyn; \
1128     continue; \
1129     } \
1130 vapier 1.217 soname = elf->data + offset; \
1131 vapier 1.84 *found_soname = 1; \
1132 solar 1.127 return (be_wewy_wewy_quiet ? NULL : soname); \
1133 vapier 1.84 } \
1134     ++dyn; \
1135     } \
1136     } }
1137     SHOW_SONAME(32)
1138     SHOW_SONAME(64)
1139     }
1140    
1141     return NULL;
1142     }
1143 solar 1.177
1144 vapier 1.215 /*
1145     * We support the symbol form:
1146     * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1147     * If the symbol name is empty, then all symbols are matched.
1148     * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1149     * Do not rely on this output format at all.
1150     * Otherwise the symbol name is used to search (either regex or string compare).
1151     * If the first char of the symbol name is a plus ("+"), then only match
1152     * defined symbols. If it's a minus ("-"), only match undefined symbols.
1153     * Putting modifiers in between the percent signs allows for more in depth
1154     * filters. There are groups of modifiers. If you don't specify a member
1155     * of a group, then all types in that group are matched. The current
1156     * groups and their types are:
1157 vapier 1.238 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1158 vapier 1.215 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1159     * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1160     * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1161     * You can search for multiple symbols at once by seperating with a comma (",").
1162     *
1163     * Some examples:
1164     * ELFs with a weak function "foo":
1165     * scanelf -s %wf%foo <ELFs>
1166     * ELFs that define the symbol "main":
1167     * scanelf -s +main <ELFs>
1168     * scanelf -s %d%main <ELFs>
1169     * ELFs that refer to the undefined symbol "brk":
1170     * scanelf -s -brk <ELFs>
1171     * scanelf -s %u%brk <ELFs>
1172     * All global defined objects in an ELF:
1173     * scanelf -s %ogd% <ELF>
1174     */
1175     static void
1176     scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1177     unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1178     {
1179     char *this_sym, *next_sym, saved = saved;
1180    
1181     /* allow the user to specify a comma delimited list of symbols to search for */
1182     next_sym = NULL;
1183     do {
1184     bool inc_notype, inc_object, inc_func, inc_file,
1185     inc_local, inc_global, inc_weak,
1186     inc_def, inc_undef, inc_abs, inc_common;
1187    
1188     if (next_sym) {
1189     next_sym[-1] = saved;
1190     this_sym = next_sym;
1191     } else
1192     this_sym = find_sym;
1193     if ((next_sym = strchr(this_sym, ','))) {
1194     /* make parsing easier by killing the comma temporarily */
1195     saved = *next_sym;
1196     *next_sym = '\0';
1197     next_sym += 1;
1198     }
1199    
1200     /* symbol selection! */
1201     inc_notype = inc_object = inc_func = inc_file = \
1202     inc_local = inc_global = inc_weak = \
1203     inc_def = inc_undef = inc_abs = inc_common = \
1204     (*this_sym != '%');
1205    
1206     /* parse the contents of %...% */
1207     if (!inc_notype) {
1208     while (*(this_sym++)) {
1209     if (*this_sym == '%') {
1210     ++this_sym;
1211     break;
1212     }
1213     switch (*this_sym) {
1214     case 'n': inc_notype = true; break;
1215     case 'o': inc_object = true; break;
1216     case 'f': inc_func = true; break;
1217     case 'F': inc_file = true; break;
1218     case 'l': inc_local = true; break;
1219     case 'g': inc_global = true; break;
1220     case 'w': inc_weak = true; break;
1221     case 'd': inc_def = true; break;
1222     case 'u': inc_undef = true; break;
1223     case 'a': inc_abs = true; break;
1224     case 'c': inc_common = true; break;
1225     default: err("invalid symbol selector '%c'", *this_sym);
1226     }
1227     }
1228    
1229     /* If no types are matched, not match all */
1230     if (!inc_notype && !inc_object && !inc_func && !inc_file)
1231     inc_notype = inc_object = inc_func = inc_file = true;
1232     if (!inc_local && !inc_global && !inc_weak)
1233     inc_local = inc_global = inc_weak = true;
1234     if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1235     inc_def = inc_undef = inc_abs = inc_common = true;
1236    
1237     /* backwards compat for defined/undefined short hand */
1238     } else if (*this_sym == '+') {
1239     inc_undef = false;
1240     ++this_sym;
1241     } else if (*this_sym == '-') {
1242     inc_def = inc_abs = inc_common = false;
1243     ++this_sym;
1244     }
1245    
1246     /* filter symbols */
1247     if ((!inc_notype && stt == STT_NOTYPE) || \
1248     (!inc_object && stt == STT_OBJECT) || \
1249     (!inc_func && stt == STT_FUNC ) || \
1250     (!inc_file && stt == STT_FILE ) || \
1251     (!inc_local && stb == STB_LOCAL ) || \
1252     (!inc_global && stb == STB_GLOBAL) || \
1253     (!inc_weak && stb == STB_WEAK ) || \
1254     (!inc_def && shn && shn < SHN_LORESERVE) || \
1255     (!inc_undef && shn == SHN_UNDEF ) || \
1256     (!inc_abs && shn == SHN_ABS ) || \
1257     (!inc_common && shn == SHN_COMMON))
1258     continue;
1259    
1260     if (*this_sym == '*') {
1261     /* a "*" symbol gets you debug output */
1262     printf("%s(%s) %5lX %15s %15s %15s %s\n",
1263     ((*found_sym == 0) ? "\n\t" : "\t"),
1264     elf->base_filename,
1265     size,
1266     get_elfstttype(stt),
1267     get_elfstbtype(stb),
1268     get_elfshntype(shn),
1269     symname);
1270     goto matched;
1271    
1272     } else {
1273     if (g_match) {
1274     /* regex match the symbol */
1275     if (rematch(this_sym, symname, REG_EXTENDED) != 0)
1276     continue;
1277    
1278     } else if (*this_sym) {
1279     /* give empty symbols a "pass", else do a normal compare */
1280     const size_t len = strlen(this_sym);
1281     if (!(strncmp(this_sym, symname, len) == 0 &&
1282     /* Accept unversioned symbol names */
1283     (symname[len] == '\0' || symname[len] == '@')))
1284     continue;
1285     }
1286    
1287     if (be_semi_verbose) {
1288     char buf[1024];
1289     snprintf(buf, sizeof(buf), "%lX %s %s",
1290     size,
1291     get_elfstttype(stt),
1292     this_sym);
1293     *ret = xstrdup(buf);
1294     } else {
1295     if (*ret) xchrcat(ret, ',', ret_len);
1296     xstrcat(ret, symname, ret_len);
1297     }
1298    
1299     goto matched;
1300     }
1301     } while (next_sym);
1302    
1303     return;
1304    
1305     matched:
1306     *found_sym = 1;
1307     if (next_sym)
1308     next_sym[-1] = saved;
1309 flameeyes 1.197 }
1310    
1311 vapier 1.225 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1312 vapier 1.39 {
1313 vapier 1.95 char *ret;
1314 vapier 1.39 void *symtab_void, *strtab_void;
1315 vapier 1.38
1316 vapier 1.41 if (!find_sym) return NULL;
1317 vapier 1.214 ret = NULL;
1318 vapier 1.32
1319 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1320 vapier 1.27
1321 vapier 1.39 if (symtab_void && strtab_void) {
1322 vapier 1.27 #define FIND_SYM(B) \
1323     if (elf->elf_class == ELFCLASS ## B) { \
1324     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1325     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1326 vapier 1.217 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1327 vapier 1.234 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1328 vapier 1.27 char *symname; \
1329 vapier 1.214 size_t ret_len = 0; \
1330 vapier 1.115 if (cnt) \
1331     cnt = EGET(symtab->sh_size) / cnt; \
1332 vapier 1.27 for (i = 0; i < cnt; ++i) { \
1333 vapier 1.217 if ((void*)sym > elf->data_end) { \
1334 flameeyes 1.195 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1335     goto break_out; \
1336     } \
1337 vapier 1.27 if (sym->st_name) { \
1338 vapier 1.134 /* make sure the symbol name is in acceptable memory range */ \
1339 vapier 1.217 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1340     if ((void*)symname > elf->data_end) { \
1341 vapier 1.115 warnf("%s: corrupt ELF symbols", elf->filename); \
1342 vapier 1.134 ++sym; \
1343 vapier 1.111 continue; \
1344     } \
1345 vapier 1.215 scanelf_match_symname(elf, found_sym, \
1346     &ret, &ret_len, symname, \
1347     ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1348     ELF##B##_ST_BIND(EGET(sym->st_info)), \
1349     EGET(sym->st_shndx), \
1350     /* st_size can be 64bit, but no one is really that big, so screw em */ \
1351     EGET(sym->st_size)); \
1352 vapier 1.27 } \
1353     ++sym; \
1354 vapier 1.234 } \
1355     }
1356 vapier 1.27 FIND_SYM(32)
1357     FIND_SYM(64)
1358 vapier 1.39 }
1359 vapier 1.70
1360 vapier 1.95 break_out:
1361 solar 1.127 if (be_wewy_wewy_quiet) return NULL;
1362 vapier 1.70
1363 vapier 1.41 if (*find_sym != '*' && *found_sym)
1364 vapier 1.95 return ret;
1365 vapier 1.41 if (be_quiet)
1366     return NULL;
1367     else
1368 vapier 1.225 return " - ";
1369 vapier 1.39 }
1370 solar 1.119
1371 vapier 1.225 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1372 solar 1.124 {
1373     if (!find_section)
1374     return NULL;
1375    
1376     #define FIND_SECTION(B) \
1377     if (elf->elf_class == ELFCLASS ## B) { \
1378 vapier 1.226 size_t matched, n; \
1379 solar 1.136 int invert; \
1380 vapier 1.226 const char *section_name; \
1381 solar 1.124 Elf ## B ## _Shdr *section; \
1382 vapier 1.226 \
1383     matched = 0; \
1384     array_for_each(find_section_arr, n, section_name) { \
1385     invert = (*section_name == '!' ? 1 : 0); \
1386     section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1387     if ((section == NULL && invert) || (section != NULL && !invert)) \
1388     ++matched; \
1389     } \
1390     \
1391     if (matched == array_cnt(find_section_arr)) \
1392 solar 1.124 *found_section = 1; \
1393     }
1394     FIND_SECTION(32)
1395     FIND_SECTION(64)
1396    
1397 vapier 1.138 if (be_wewy_wewy_quiet)
1398     return NULL;
1399 solar 1.124
1400     if (*found_section)
1401     return find_section;
1402    
1403     if (be_quiet)
1404     return NULL;
1405     else
1406 vapier 1.225 return " - ";
1407 solar 1.124 }
1408    
1409 vapier 1.39 /* scan an elf file and show all the fun stuff */
1410 vapier 1.210 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1411 vapier 1.106 static int scanelf_elfobj(elfobj *elf)
1412 vapier 1.39 {
1413 vapier 1.44 unsigned long i;
1414 vapier 1.162 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1415     found_rpath, found_needed, found_interp, found_bind, found_soname,
1416 solar 1.124 found_sym, found_lib, found_file, found_textrels, found_section;
1417 vapier 1.41 static char *out_buffer = NULL;
1418     static size_t out_len;
1419 vapier 1.39
1420 vapier 1.76 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1421 vapier 1.84 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1422 solar 1.124 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1423 vapier 1.39
1424 vapier 1.114 if (be_verbose > 2)
1425 vapier 1.106 printf("%s: scanning file {%s,%s}\n", elf->filename,
1426 vapier 1.69 get_elfeitype(EI_CLASS, elf->elf_class),
1427     get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1428 vapier 1.114 else if (be_verbose > 1)
1429 vapier 1.106 printf("%s: scanning file\n", elf->filename);
1430 vapier 1.39
1431 vapier 1.41 /* init output buffer */
1432     if (!out_buffer) {
1433     out_len = sizeof(char) * 80;
1434 vapier 1.186 out_buffer = xmalloc(out_len);
1435 vapier 1.41 }
1436     *out_buffer = '\0';
1437    
1438 vapier 1.39 /* show the header */
1439     if (!be_quiet && show_banner) {
1440 vapier 1.49 for (i = 0; out_format[i]; ++i) {
1441 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
1442 vapier 1.41
1443     switch (out_format[++i]) {
1444 solar 1.132 case '+': break;
1445 vapier 1.41 case '%': break;
1446 vapier 1.70 case '#': break;
1447 vapier 1.66 case 'F':
1448     case 'p':
1449     case 'f': prints("FILE "); found_file = 1; break;
1450 vapier 1.41 case 'o': prints(" TYPE "); break;
1451     case 'x': prints(" PAX "); break;
1452 vapier 1.71 case 'e': prints("STK/REL/PTL "); break;
1453 vapier 1.41 case 't': prints("TEXTREL "); break;
1454     case 'r': prints("RPATH "); break;
1455 vapier 1.171 case 'M': prints("CLASS "); break;
1456 vapier 1.240 case 'l':
1457 vapier 1.41 case 'n': prints("NEEDED "); break;
1458     case 'i': prints("INTERP "); break;
1459 vapier 1.49 case 'b': prints("BIND "); break;
1460 solar 1.190 case 'Z': prints("SIZE "); break;
1461 vapier 1.84 case 'S': prints("SONAME "); break;
1462 vapier 1.41 case 's': prints("SYM "); break;
1463 vapier 1.72 case 'N': prints("LIB "); break;
1464 vapier 1.76 case 'T': prints("TEXTRELS "); break;
1465 vapier 1.126 case 'k': prints("SECTION "); break;
1466 vapier 1.166 case 'a': prints("ARCH "); break;
1467 solar 1.191 case 'I': prints("OSABI "); break;
1468     case 'Y': prints("EABI "); break;
1469 solar 1.180 case 'O': prints("PERM "); break;
1470 solar 1.181 case 'D': prints("ENDIAN "); break;
1471 vapier 1.76 default: warnf("'%c' has no title ?", out_format[i]);
1472 vapier 1.39 }
1473 vapier 1.27 }
1474 vapier 1.49 if (!found_file) prints("FILE ");
1475 vapier 1.41 prints("\n");
1476 vapier 1.49 found_file = 0;
1477 vapier 1.39 show_banner = 0;
1478     }
1479    
1480     /* dump all the good stuff */
1481 vapier 1.49 for (i = 0; out_format[i]; ++i) {
1482 vapier 1.41 const char *out;
1483 vapier 1.66 const char *tmp;
1484 solar 1.190 static char ubuf[sizeof(unsigned long)*2];
1485 vapier 1.70 if (!IS_MODIFIER(out_format[i])) {
1486 vapier 1.41 xchrcat(&out_buffer, out_format[i], &out_len);
1487     continue;
1488     }
1489 vapier 1.39
1490 vapier 1.41 out = NULL;
1491 solar 1.127 be_wewy_wewy_quiet = (out_format[i] == '#');
1492 solar 1.132 be_semi_verbose = (out_format[i] == '+');
1493 vapier 1.41 switch (out_format[++i]) {
1494 solar 1.132 case '+':
1495 vapier 1.70 case '%':
1496     case '#':
1497     xchrcat(&out_buffer, out_format[i], &out_len); break;
1498     case 'F':
1499 vapier 1.76 found_file = 1;
1500 solar 1.127 if (be_wewy_wewy_quiet) break;
1501 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
1502 vapier 1.70 break;
1503 vapier 1.66 case 'p':
1504 vapier 1.76 found_file = 1;
1505 solar 1.127 if (be_wewy_wewy_quiet) break;
1506 vapier 1.106 tmp = elf->filename;
1507 vapier 1.66 if (search_path) {
1508     ssize_t len_search = strlen(search_path);
1509 vapier 1.106 ssize_t len_file = strlen(elf->filename);
1510     if (!strncmp(elf->filename, search_path, len_search) && \
1511 vapier 1.66 len_file > len_search)
1512     tmp += len_search;
1513     if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1514     }
1515     xstrcat(&out_buffer, tmp, &out_len);
1516     break;
1517     case 'f':
1518 vapier 1.76 found_file = 1;
1519 solar 1.127 if (be_wewy_wewy_quiet) break;
1520 vapier 1.106 tmp = strrchr(elf->filename, '/');
1521     tmp = (tmp == NULL ? elf->filename : tmp+1);
1522 vapier 1.66 xstrcat(&out_buffer, tmp, &out_len);
1523     break;
1524 vapier 1.41 case 'o': out = get_elfetype(elf); break;
1525     case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1526 solar 1.73 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1527 vapier 1.41 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1528 vapier 1.79 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1529 vapier 1.41 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1530 vapier 1.171 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1531 solar 1.181 case 'D': out = get_endian(elf); break;
1532 vapier 1.206 case 'O': out = strfileperms(elf->filename); break;
1533 vapier 1.72 case 'n':
1534     case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1535 vapier 1.41 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1536 vapier 1.49 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1537 vapier 1.84 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1538 vapier 1.72 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1539 solar 1.124 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1540 vapier 1.166 case 'a': out = get_elfemtype(elf); break;
1541 solar 1.191 case 'I': out = get_elfosabi(elf); break;
1542     case 'Y': out = get_elf_eabi(elf); break;
1543 vapier 1.193 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1544 vapier 1.76 default: warnf("'%c' has no scan code?", out_format[i]);
1545 vapier 1.29 }
1546 vapier 1.214 if (out)
1547     xstrcat(&out_buffer, out, &out_len);
1548 vapier 1.39 }
1549    
1550 vapier 1.54 #define FOUND_SOMETHING() \
1551 solar 1.73 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1552 vapier 1.76 found_rpath || found_needed || found_interp || found_bind || \
1553 solar 1.124 found_soname || found_sym || found_lib || found_textrels || found_section )
1554 vapier 1.54
1555     if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1556     xchrcat(&out_buffer, ' ', &out_len);
1557 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
1558 vapier 1.27 }
1559 vapier 1.79 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1560 vapier 1.41 puts(out_buffer);
1561 vapier 1.79 fflush(stdout);
1562     }
1563 vapier 1.10
1564 vapier 1.105 return 0;
1565     }
1566    
1567 vapier 1.106 /* scan a single elf */
1568     static int scanelf_elf(const char *filename, int fd, size_t len)
1569     {
1570 solar 1.120 int ret = 1;
1571 vapier 1.106 elfobj *elf;
1572    
1573     /* verify this is real ELF */
1574     if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1575     if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1576 vapier 1.235 return 2;
1577 solar 1.120 }
1578     switch (match_bits) {
1579     case 32:
1580     if (elf->elf_class != ELFCLASS32)
1581     goto label_done;
1582     break;
1583     case 64:
1584     if (elf->elf_class != ELFCLASS64)
1585     goto label_done;
1586     break;
1587     default: break;
1588 vapier 1.106 }
1589 vapier 1.228 if (match_etypes) {
1590 solar 1.119 char sbuf[126];
1591     strncpy(sbuf, match_etypes, sizeof(sbuf));
1592     if (strchr(match_etypes, ',') != NULL) {
1593     char *p;
1594 vapier 1.186 while ((p = strrchr(sbuf, ',')) != NULL) {
1595 solar 1.119 *p = 0;
1596 solar 1.129 if (etype_lookup(p+1) == get_etype(elf))
1597 solar 1.119 goto label_ret;
1598     }
1599     }
1600 solar 1.129 if (etype_lookup(sbuf) != get_etype(elf))
1601 solar 1.119 goto label_done;
1602     }
1603    
1604     label_ret:
1605 vapier 1.106 ret = scanelf_elfobj(elf);
1606 solar 1.119
1607     label_done:
1608 vapier 1.106 unreadelf(elf);
1609     return ret;
1610     }
1611 solar 1.119
1612 vapier 1.105 /* scan an archive of elfs */
1613 vapier 1.106 static int scanelf_archive(const char *filename, int fd, size_t len)
1614 vapier 1.105 {
1615 vapier 1.106 archive_handle *ar;
1616 vapier 1.105 archive_member *m;
1617 vapier 1.106 char *ar_buffer;
1618     elfobj *elf;
1619    
1620     ar = ar_open_fd(filename, fd);
1621     if (ar == NULL)
1622     return 1;
1623    
1624 vapier 1.201 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1625 vapier 1.218 while ((m = ar_next(ar)) != NULL) {
1626     off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1627     if (cur_pos == -1)
1628     errp("lseek() failed");
1629     elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1630 vapier 1.106 if (elf) {
1631     scanelf_elfobj(elf);
1632     unreadelf(elf);
1633     }
1634     }
1635     munmap(ar_buffer, len);
1636    
1637 vapier 1.105 return 0;
1638     }
1639     /* scan a file which may be an elf or an archive or some other magical beast */
1640 vapier 1.232 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1641 vapier 1.105 {
1642 vapier 1.161 const struct stat *st = st_cache;
1643     struct stat symlink_st;
1644 vapier 1.106 int fd;
1645 vapier 1.105
1646     /* always handle regular files and handle symlinked files if no -y */
1647 vapier 1.161 if (S_ISLNK(st->st_mode)) {
1648 vapier 1.232 if (!scan_symlink)
1649     return 1;
1650     fstatat(dir_fd, filename, &symlink_st, 0);
1651 vapier 1.161 st = &symlink_st;
1652 vapier 1.105 }
1653 vapier 1.161
1654     if (!S_ISREG(st->st_mode)) {
1655 vapier 1.105 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1656 solar 1.164 return 1;
1657 vapier 1.105 }
1658    
1659 solar 1.180 if (match_perms) {
1660     if ((st->st_mode | match_perms) != st->st_mode)
1661     return 1;
1662     }
1663 vapier 1.232 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1664 vapier 1.245 if (fd == -1) {
1665     if (fix_elf && errno == ETXTBSY)
1666     warnp("%s: could not fix", filename);
1667     else if (be_verbose > 2)
1668     printf("%s: skipping file: %s\n", filename, strerror(errno));
1669 solar 1.164 return 1;
1670 vapier 1.245 }
1671 vapier 1.106
1672 vapier 1.235 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1673 vapier 1.105 /* if it isn't an ELF, maybe it's an .a archive */
1674 vapier 1.235 if (scan_archives)
1675     scanelf_archive(filename, fd, st->st_size);
1676    
1677     /*
1678     * unreadelf() implicitly closes its fd, so only close it
1679     * when we are returning it in the non-ELF case
1680     */
1681     close(fd);
1682     }
1683 vapier 1.106
1684 solar 1.164 return 0;
1685 solar 1.6 }
1686    
1687 solar 1.1 /* scan a directory for ET_EXEC files and print when we find one */
1688 vapier 1.232 static int scanelf_dirat(int dir_fd, const char *path)
1689 solar 1.1 {
1690 vapier 1.10 register DIR *dir;
1691     register struct dirent *dentry;
1692 vapier 1.14 struct stat st_top, st;
1693 vapier 1.232 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1694 vapier 1.32 size_t pathlen = 0, len = 0;
1695 solar 1.164 int ret = 0;
1696 vapier 1.232 int subdir_fd;
1697 solar 1.223
1698 vapier 1.10 /* make sure path exists */
1699 vapier 1.232 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1700 vapier 1.39 if (be_verbose > 2) printf("%s: does not exist\n", path);
1701 solar 1.164 return 1;
1702 vapier 1.39 }
1703 solar 1.11
1704 vapier 1.10 /* ok, if it isn't a directory, assume we can open it */
1705 vapier 1.232 if (!S_ISDIR(st_top.st_mode))
1706     return scanelf_fileat(dir_fd, path, &st_top);
1707 vapier 1.10
1708     /* now scan the dir looking for fun stuff */
1709 vapier 1.232 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1710     if (subdir_fd == -1)
1711     dir = NULL;
1712     else
1713     dir = fdopendir(subdir_fd);
1714     if (dir == NULL) {
1715     if (subdir_fd != -1)
1716     close(subdir_fd);
1717 vapier 1.237 warnfp("could not opendir(%s)", path);
1718 solar 1.164 return 1;
1719 vapier 1.10 }
1720 vapier 1.114 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1721 solar 1.11
1722 vapier 1.232 subpath = stpcpy(buf, path);
1723 vapier 1.243 if (subpath[-1] != '/')
1724     *subpath++ = '/';
1725 vapier 1.232 pathlen = subpath - buf;
1726 vapier 1.10 while ((dentry = readdir(dir))) {
1727     if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1728     continue;
1729 vapier 1.232
1730     if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1731     continue;
1732    
1733     len = strlen(dentry->d_name);
1734     if (len + pathlen + 1 >= sizeof(buf)) {
1735     warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1736     path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1737 vapier 1.32 continue;
1738     }
1739 vapier 1.232 memcpy(subpath, dentry->d_name, len);
1740     subpath[len] = '\0';
1741    
1742     if (S_ISREG(st.st_mode))
1743     ret = scanelf_fileat(dir_fd, buf, &st);
1744     else if (dir_recurse && S_ISDIR(st.st_mode)) {
1745     if (dir_crossmount || (st_top.st_dev == st.st_dev))
1746     ret = scanelf_dirat(dir_fd, buf);
1747 vapier 1.10 }
1748     }
1749     closedir(dir);
1750 vapier 1.232
1751 solar 1.164 return ret;
1752 solar 1.1 }
1753 vapier 1.232 static int scanelf_dir(const char *path)
1754     {
1755     return scanelf_dirat(root_fd, root_rel_path(path));
1756     }
1757 solar 1.1
1758 vapier 1.133 static int scanelf_from_file(const char *filename)
1759 vapier 1.47 {
1760 vapier 1.230 FILE *fp;
1761     char *p, *path;
1762     size_t len;
1763     int ret;
1764 solar 1.45
1765 solar 1.132 if (strcmp(filename, "-") == 0)
1766 solar 1.45 fp = stdin;
1767     else if ((fp = fopen(filename, "r")) == NULL)
1768     return 1;
1769    
1770 vapier 1.230 path = NULL;
1771     len = 0;
1772     ret = 0;
1773     while (getline(&path, &len, fp) != -1) {
1774 solar 1.45 if ((p = strchr(path, '\n')) != NULL)
1775     *p = 0;
1776 vapier 1.66 search_path = path;
1777 solar 1.164 ret = scanelf_dir(path);
1778 solar 1.45 }
1779 vapier 1.230 free(path);
1780    
1781 solar 1.45 if (fp != stdin)
1782     fclose(fp);
1783 vapier 1.230
1784 solar 1.164 return ret;
1785 solar 1.45 }
1786    
1787 solar 1.154 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1788 vapier 1.148
1789 vapier 1.240 static int _load_ld_cache_config(const char *fname)
1790 vapier 1.48 {
1791     FILE *fp = NULL;
1792 vapier 1.230 char *p, *path;
1793     size_t len;
1794 vapier 1.232 int curr_fd = -1;
1795 solar 1.223
1796 vapier 1.232 fp = fopenat_r(root_fd, root_rel_path(fname));
1797     if (fp == NULL)
1798 vapier 1.240 return -1;
1799 vapier 1.48
1800 vapier 1.230 path = NULL;
1801     len = 0;
1802     while (getline(&path, &len, fp) != -1) {
1803 vapier 1.48 if ((p = strrchr(path, '\r')) != NULL)
1804     *p = 0;
1805     if ((p = strchr(path, '\n')) != NULL)
1806     *p = 0;
1807 vapier 1.219
1808 vapier 1.186 /* recursive includes of the same file will make this segfault. */
1809 solar 1.129 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1810 vapier 1.219 glob_t gl;
1811 solar 1.123 size_t x;
1812 vapier 1.232 const char *gpath;
1813 solar 1.123
1814 vapier 1.232 /* re-use existing path buffer ... need to be creative */
1815 solar 1.123 if (path[8] != '/')
1816 vapier 1.232 gpath = memcpy(path + 3, "/etc/", 5);
1817 solar 1.123 else
1818 vapier 1.232 gpath = path + 8;
1819     if (root_fd != AT_FDCWD) {
1820     if (curr_fd == -1) {
1821     curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1822     if (fchdir(root_fd))
1823     errp("unable to change to root dir");
1824     }
1825     gpath = root_rel_path(gpath);
1826     }
1827 solar 1.123
1828 vapier 1.219 if (glob(gpath, 0, NULL, &gl) == 0) {
1829 solar 1.123 for (x = 0; x < gl.gl_pathc; ++x) {
1830     /* try to avoid direct loops */
1831     if (strcmp(gl.gl_pathv[x], fname) == 0)
1832     continue;
1833 vapier 1.240 _load_ld_cache_config(gl.gl_pathv[x]);
1834 solar 1.123 }
1835 vapier 1.219 globfree(&gl);
1836 solar 1.160 }
1837 vapier 1.232
1838     /* failed globs are ignored by glibc */
1839     continue;
1840 solar 1.123 }
1841 vapier 1.219
1842 solar 1.123 if (*path != '/')
1843     continue;
1844 vapier 1.48
1845 vapier 1.233 xarraypush_str(ldpaths, path);
1846 vapier 1.48 }
1847 vapier 1.230 free(path);
1848 vapier 1.48
1849     fclose(fp);
1850 vapier 1.230
1851 vapier 1.232 if (curr_fd != -1) {
1852     if (fchdir(curr_fd))
1853     /* don't care */;
1854     close(curr_fd);
1855     }
1856    
1857 vapier 1.240 return 0;
1858 vapier 1.48 }
1859 flameeyes 1.141
1860 vapier 1.211 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1861 vapier 1.148
1862 vapier 1.240 static int _load_ld_cache_config(const char *fname)
1863 flameeyes 1.141 {
1864     FILE *fp = NULL;
1865     char *b = NULL, *p;
1866     struct elfhints_hdr hdr;
1867 vapier 1.152
1868 vapier 1.232 fp = fopenat_r(root_fd, root_rel_path(fname));
1869     if (fp == NULL)
1870 vapier 1.240 return -1;
1871 flameeyes 1.141
1872 vapier 1.152 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1873     hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1874     fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1875     {
1876 flameeyes 1.141 fclose(fp);
1877 vapier 1.240 return -1;
1878 flameeyes 1.141 }
1879 vapier 1.152
1880 vapier 1.186 b = xmalloc(hdr.dirlistlen + 1);
1881 vapier 1.152 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1882 flameeyes 1.141 fclose(fp);
1883     free(b);
1884 vapier 1.240 return -1;
1885 flameeyes 1.141 }
1886 vapier 1.152
1887     while ((p = strsep(&b, ":"))) {
1888 vapier 1.227 if (*p == '\0')
1889     continue;
1890 vapier 1.233 xarraypush_str(ldpaths, p);
1891 flameeyes 1.141 }
1892 vapier 1.157
1893 flameeyes 1.141 free(b);
1894     fclose(fp);
1895 vapier 1.240 return 0;
1896 flameeyes 1.141 }
1897 vapier 1.148
1898     #else
1899 vapier 1.192 #ifdef __ELF__
1900 vapier 1.148 #warning Cache config support not implemented for your target
1901 vapier 1.192 #endif
1902 vapier 1.240 static int _load_ld_cache_config(const char *fname)
1903 vapier 1.148 {
1904 vapier 1.192 return 0;
1905 vapier 1.148 }
1906 flameeyes 1.141 #endif
1907 vapier 1.48
1908 vapier 1.240 static void load_ld_cache_config(const char *fname)
1909     {
1910     bool scan_l, scan_ul, scan_ull;
1911     size_t n;
1912     const char *ldpath;
1913    
1914     _load_ld_cache_config(fname);
1915    
1916     scan_l = scan_ul = scan_ull = false;
1917     if (array_cnt(ldpaths)) {
1918     array_for_each(ldpaths, n, ldpath) {
1919     if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1920     if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1921     if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1922     }
1923     }
1924    
1925     if (!scan_l) xarraypush_str(ldpaths, "/lib");
1926     if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1927     if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1928     }
1929    
1930 vapier 1.10 /* scan /etc/ld.so.conf for paths */
1931 vapier 1.184 static void scanelf_ldpath(void)
1932 vapier 1.10 {
1933 vapier 1.227 size_t n;
1934     const char *ldpath;
1935 vapier 1.17
1936 vapier 1.240 array_for_each(ldpaths, n, ldpath)
1937 vapier 1.227 scanelf_dir(ldpath);
1938 vapier 1.10 }
1939 solar 1.1
1940 vapier 1.10 /* scan env PATH for paths */
1941 vapier 1.184 static void scanelf_envpath(void)
1942 solar 1.1 {
1943 solar 1.34 char *path, *p;
1944 vapier 1.10
1945     path = getenv("PATH");
1946     if (!path)
1947     err("PATH is not set in your env !");
1948 vapier 1.41 path = xstrdup(path);
1949 vapier 1.10
1950     while ((p = strrchr(path, ':')) != NULL) {
1951     scanelf_dir(p + 1);
1952     *p = 0;
1953     }
1954 vapier 1.17
1955 solar 1.34 free(path);
1956 solar 1.1 }
1957    
1958 vapier 1.221 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1959     #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1960 vapier 1.27 #define a_argument required_argument
1961 vapier 1.10 static struct option const long_opts[] = {
1962     {"path", no_argument, NULL, 'p'},
1963     {"ldpath", no_argument, NULL, 'l'},
1964 vapier 1.240 {"use-ldpath",no_argument, NULL, 129},
1965 solar 1.223 {"root", a_argument, NULL, 128},
1966 vapier 1.10 {"recursive", no_argument, NULL, 'R'},
1967 vapier 1.14 {"mount", no_argument, NULL, 'm'},
1968 vapier 1.37 {"symlink", no_argument, NULL, 'y'},
1969 vapier 1.105 {"archives", no_argument, NULL, 'A'},
1970     {"ldcache", no_argument, NULL, 'L'},
1971 vapier 1.101 {"fix", no_argument, NULL, 'X'},
1972 solar 1.127 {"setpax", a_argument, NULL, 'z'},
1973 vapier 1.10 {"pax", no_argument, NULL, 'x'},
1974 solar 1.16 {"header", no_argument, NULL, 'e'},
1975 vapier 1.10 {"textrel", no_argument, NULL, 't'},
1976     {"rpath", no_argument, NULL, 'r'},
1977 vapier 1.32 {"needed", no_argument, NULL, 'n'},
1978 vapier 1.38 {"interp", no_argument, NULL, 'i'},
1979 vapier 1.49 {"bind", no_argument, NULL, 'b'},
1980 vapier 1.84 {"soname", no_argument, NULL, 'S'},
1981 vapier 1.76 {"symbol", a_argument, NULL, 's'},
1982 solar 1.124 {"section", a_argument, NULL, 'k'},
1983 vapier 1.76 {"lib", a_argument, NULL, 'N'},
1984 solar 1.86 {"gmatch", no_argument, NULL, 'g'},
1985 vapier 1.76 {"textrels", no_argument, NULL, 'T'},
1986 solar 1.119 {"etype", a_argument, NULL, 'E'},
1987 solar 1.120 {"bits", a_argument, NULL, 'M'},
1988 solar 1.181 {"endian", no_argument, NULL, 'D'},
1989 solar 1.191 {"osabi", no_argument, NULL, 'I'},
1990     {"eabi", no_argument, NULL, 'Y'},
1991 solar 1.180 {"perms", a_argument, NULL, 'O'},
1992 solar 1.190 {"size", no_argument, NULL, 'Z'},
1993 vapier 1.10 {"all", no_argument, NULL, 'a'},
1994     {"quiet", no_argument, NULL, 'q'},
1995 vapier 1.14 {"verbose", no_argument, NULL, 'v'},
1996 vapier 1.76 {"format", a_argument, NULL, 'F'},
1997     {"from", a_argument, NULL, 'f'},
1998     {"file", a_argument, NULL, 'o'},
1999 vapier 1.221 {"nocolor", no_argument, NULL, 'C'},
2000 solar 1.16 {"nobanner", no_argument, NULL, 'B'},
2001 vapier 1.10 {"help", no_argument, NULL, 'h'},
2002     {"version", no_argument, NULL, 'V'},
2003     {NULL, no_argument, NULL, 0x0}
2004     };
2005 solar 1.57
2006 vapier 1.222 static const char * const opts_help[] = {
2007 vapier 1.10 "Scan all directories in PATH environment",
2008     "Scan all directories in /etc/ld.so.conf",
2009 vapier 1.240 "Use ld.so.conf to show full path (use with -r/-n)",
2010 solar 1.223 "Root directory (use with -l or -p)",
2011 vapier 1.14 "Scan directories recursively",
2012 vapier 1.37 "Don't recursively cross mount points",
2013 vapier 1.101 "Don't scan symlinks",
2014 vapier 1.105 "Scan archives (.a files)",
2015 vapier 1.239 "Utilize ld.so.cache to show full path (use with -r/-n)",
2016 solar 1.127 "Try and 'fix' bad things (use with -r/-e)",
2017     "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
2018 vapier 1.10 "Print PaX markings",
2019 vapier 1.71 "Print GNU_STACK/PT_LOAD markings",
2020 vapier 1.10 "Print TEXTREL information",
2021     "Print RPATH information",
2022 vapier 1.32 "Print NEEDED information",
2023 vapier 1.38 "Print INTERP information",
2024 vapier 1.49 "Print BIND information",
2025 vapier 1.84 "Print SONAME information",
2026 vapier 1.27 "Find a specified symbol",
2027 solar 1.124 "Find a specified section",
2028 vapier 1.72 "Find a specified library",
2029 vapier 1.226 "Use regex matching rather than string compare (use with -s)",
2030 vapier 1.76 "Locate cause of TEXTREL",
2031 solar 1.129 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2032 solar 1.120 "Print only ELF files matching numeric bits",
2033 solar 1.181 "Print Endianness",
2034 solar 1.191 "Print OSABI",
2035     "Print EABI (EM_ARM Only)",
2036 solar 1.180 "Print only ELF files matching octal permissions",
2037 solar 1.190 "Print ELF file size",
2038 vapier 1.216 "Print all useful/simple info\n",
2039 vapier 1.14 "Only output 'bad' things",
2040     "Be verbose (can be specified more than once)",
2041 vapier 1.39 "Use specified format for output",
2042 solar 1.45 "Read input stream from a filename",
2043 vapier 1.24 "Write output stream to a filename",
2044 vapier 1.221 "Don't emit color in output",
2045 vapier 1.14 "Don't display the header",
2046 vapier 1.10 "Print this help and exit",
2047     "Print version and exit",
2048     NULL
2049     };
2050    
2051     /* display usage and exit */
2052     static void usage(int status)
2053 solar 1.1 {
2054 vapier 1.44 unsigned long i;
2055 solar 1.52 printf("* Scan ELF binaries for stuff\n\n"
2056 vapier 1.105 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2057 solar 1.35 printf("Options: -[%s]\n", PARSE_FLAGS);
2058 vapier 1.241 for (i = 0; long_opts[i].name; ++i) {
2059     /* first output the short flag if it has one */
2060     if (long_opts[i].val > '~')
2061     printf(" ");
2062     else
2063     printf(" -%c, ", long_opts[i].val);
2064    
2065     /* then the long flag */
2066 vapier 1.27 if (long_opts[i].has_arg == no_argument)
2067 vapier 1.241 printf("--%-14s", long_opts[i].name);
2068 vapier 1.27 else
2069 vapier 1.241 printf("--%-7s <arg> ", long_opts[i].name);
2070    
2071     /* finally the help text */
2072     printf("* %s\n", opts_help[i]);
2073     }
2074 solar 1.45
2075 vapier 1.173 puts("\nFor more information, see the scanelf(1) manpage");
2076 vapier 1.10 exit(status);
2077 solar 1.1 }
2078    
2079     /* parse command line arguments and preform needed actions */
2080 vapier 1.165 #define do_pax_state(option, flag) \
2081     if (islower(option)) { \
2082     flags &= ~PF_##flag; \
2083     flags |= PF_NO##flag; \
2084     } else { \
2085     flags &= ~PF_NO##flag; \
2086     flags |= PF_##flag; \
2087     }
2088 solar 1.164 static int parseargs(int argc, char *argv[])
2089 vapier 1.10 {
2090 vapier 1.48 int i;
2091 vapier 1.133 const char *from_file = NULL;
2092 solar 1.164 int ret = 0;
2093 vapier 1.240 char load_cache_config = 0;
2094 vapier 1.10
2095     opterr = 0;
2096 vapier 1.48 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2097     switch (i) {
2098 vapier 1.10
2099 vapier 1.39 case 'V':
2100 vapier 1.80 printf("pax-utils-%s: %s compiled %s\n%s\n"
2101     "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2102     VERSION, __FILE__, __DATE__, rcsid, argv0);
2103 vapier 1.10 exit(EXIT_SUCCESS);
2104     break;
2105     case 'h': usage(EXIT_SUCCESS); break;
2106 solar 1.45 case 'f':
2107 vapier 1.100 if (from_file) warn("You prob don't want to specify -f twice");
2108     from_file = optarg;
2109 solar 1.45 break;
2110 solar 1.119 case 'E':
2111 vapier 1.228 match_etypes = optarg;
2112 solar 1.119 break;
2113 solar 1.120 case 'M':
2114     match_bits = atoi(optarg);
2115 solar 1.182 if (match_bits == 0) {
2116     if (strcmp(optarg, "ELFCLASS32") == 0)
2117     match_bits = 32;
2118     if (strcmp(optarg, "ELFCLASS64") == 0)
2119     match_bits = 64;
2120     }
2121 solar 1.120 break;
2122 solar 1.180 case 'O':
2123 vapier 1.205 if (sscanf(optarg, "%o", &match_perms) == -1)
2124 solar 1.180 match_bits = 0;
2125     break;
2126 vapier 1.24 case 'o': {
2127 vapier 1.146 if (freopen(optarg, "w", stdout) == NULL)
2128 vapier 1.237 errp("Could not freopen(%s)", optarg);
2129 solar 1.21 break;
2130     }
2131 solar 1.124 case 'k':
2132 vapier 1.233 xarraypush_str(find_section_arr, optarg);
2133 solar 1.124 break;
2134 vapier 1.39 case 's': {
2135 vapier 1.93 if (find_sym) warn("You prob don't want to specify -s twice");
2136     find_sym = optarg;
2137 vapier 1.39 break;
2138     }
2139 vapier 1.226 case 'N':
2140 vapier 1.233 xarraypush_str(find_lib_arr, optarg);
2141 vapier 1.72 break;
2142 vapier 1.39 case 'F': {
2143 vapier 1.93 if (out_format) warn("You prob don't want to specify -F twice");
2144     out_format = optarg;
2145 vapier 1.39 break;
2146     }
2147 solar 1.127 case 'z': {
2148 solar 1.129 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2149 solar 1.127 size_t x;
2150 vapier 1.27
2151 vapier 1.186 for (x = 0; x < strlen(optarg); x++) {
2152     switch (optarg[x]) {
2153 solar 1.127 case 'p':
2154     case 'P':
2155 vapier 1.165 do_pax_state(optarg[x], PAGEEXEC);
2156 solar 1.127 break;
2157     case 's':
2158     case 'S':
2159 vapier 1.165 do_pax_state(optarg[x], SEGMEXEC);
2160 solar 1.127 break;
2161     case 'm':
2162     case 'M':
2163 vapier 1.165 do_pax_state(optarg[x], MPROTECT);
2164 solar 1.127 break;
2165     case 'e':
2166     case 'E':
2167 vapier 1.165 do_pax_state(optarg[x], EMUTRAMP);
2168 solar 1.127 break;
2169     case 'r':
2170     case 'R':
2171 vapier 1.165 do_pax_state(optarg[x], RANDMMAP);
2172 solar 1.127 break;
2173     case 'x':
2174     case 'X':
2175 vapier 1.165 do_pax_state(optarg[x], RANDEXEC);
2176 solar 1.127 break;
2177     default:
2178     break;
2179     }
2180     }
2181     if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2182     ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2183     ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2184     ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2185     ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2186     ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2187     setpax = flags;
2188     break;
2189     }
2190 solar 1.190 case 'Z': show_size = 1; break;
2191 solar 1.176 case 'g': g_match = 1; break;
2192 vapier 1.240 case 'L': load_cache_config = use_ldcache = 1; break;
2193 vapier 1.37 case 'y': scan_symlink = 0; break;
2194 vapier 1.105 case 'A': scan_archives = 1; break;
2195 vapier 1.221 case 'C': color_init(true); break;
2196 solar 1.16 case 'B': show_banner = 0; break;
2197 vapier 1.240 case 'l': load_cache_config = scan_ldpath = 1; break;
2198 vapier 1.10 case 'p': scan_envpath = 1; break;
2199     case 'R': dir_recurse = 1; break;
2200 vapier 1.14 case 'm': dir_crossmount = 0; break;
2201 vapier 1.101 case 'X': ++fix_elf; break;
2202 vapier 1.10 case 'x': show_pax = 1; break;
2203 solar 1.73 case 'e': show_phdr = 1; break;
2204 vapier 1.10 case 't': show_textrel = 1; break;
2205     case 'r': show_rpath = 1; break;
2206 vapier 1.32 case 'n': show_needed = 1; break;
2207 vapier 1.38 case 'i': show_interp = 1; break;
2208 vapier 1.49 case 'b': show_bind = 1; break;
2209 vapier 1.84 case 'S': show_soname = 1; break;
2210 vapier 1.76 case 'T': show_textrels = 1; break;
2211 vapier 1.10 case 'q': be_quiet = 1; break;
2212 vapier 1.14 case 'v': be_verbose = (be_verbose % 20) + 1; break;
2213 solar 1.183 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2214 solar 1.181 case 'D': show_endian = 1; break;
2215 solar 1.191 case 'I': show_osabi = 1; break;
2216     case 'Y': show_eabi = 1; break;
2217 solar 1.223 case 128:
2218 vapier 1.232 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2219     if (root_fd == -1)
2220     err("Could not open root: %s", optarg);
2221 solar 1.223 break;
2222 vapier 1.240 case 129: load_cache_config = use_ldpath = 1; break;
2223 vapier 1.10 case ':':
2224 vapier 1.113 err("Option '%c' is missing parameter", optopt);
2225 vapier 1.10 case '?':
2226 solar 1.119 err("Unknown option '%c' or argument missing", optopt);
2227 vapier 1.10 default:
2228 vapier 1.113 err("Unhandled option '%c'; please report this", i);
2229 vapier 1.10 }
2230     }
2231 vapier 1.230 if (show_textrels && be_verbose)
2232     has_objdump = bin_in_path("objdump");
2233 vapier 1.226 /* flatten arrays for display */
2234     if (array_cnt(find_lib_arr))
2235     find_lib = array_flatten_str(find_lib_arr);
2236     if (array_cnt(find_section_arr))
2237     find_section = array_flatten_str(find_section_arr);
2238 vapier 1.39 /* let the format option override all other options */
2239     if (out_format) {
2240 solar 1.73 show_pax = show_phdr = show_textrel = show_rpath = \
2241 vapier 1.84 show_needed = show_interp = show_bind = show_soname = \
2242 solar 1.191 show_textrels = show_perms = show_endian = show_size = \
2243     show_osabi = show_eabi = 0;
2244 vapier 1.48 for (i = 0; out_format[i]; ++i) {
2245 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
2246 vapier 1.39
2247 vapier 1.48 switch (out_format[++i]) {
2248 solar 1.132 case '+': break;
2249 vapier 1.39 case '%': break;
2250 vapier 1.70 case '#': break;
2251 vapier 1.39 case 'F': break;
2252 vapier 1.66 case 'p': break;
2253     case 'f': break;
2254 solar 1.124 case 'k': break;
2255 vapier 1.39 case 's': break;
2256 vapier 1.72 case 'N': break;
2257 vapier 1.41 case 'o': break;
2258 vapier 1.166 case 'a': break;
2259 vapier 1.171 case 'M': break;
2260 solar 1.190 case 'Z': show_size = 1; break;
2261 solar 1.181 case 'D': show_endian = 1; break;
2262 solar 1.191 case 'I': show_osabi = 1; break;
2263     case 'Y': show_eabi = 1; break;
2264 solar 1.180 case 'O': show_perms = 1; break;
2265 vapier 1.39 case 'x': show_pax = 1; break;
2266 solar 1.73 case 'e': show_phdr = 1; break;
2267 vapier 1.39 case 't': show_textrel = 1; break;
2268     case 'r': show_rpath = 1; break;
2269     case 'n': show_needed = 1; break;
2270     case 'i': show_interp = 1; break;
2271 vapier 1.49 case 'b': show_bind = 1; break;
2272 vapier 1.84 case 'S': show_soname = 1; break;
2273 vapier 1.76 case 'T': show_textrels = 1; break;
2274 vapier 1.39 default:
2275 vapier 1.240 err("invalid format specifier '%c' (byte %i)",
2276 vapier 1.48 out_format[i], i+1);
2277 vapier 1.39 }
2278     }
2279 vapier 1.41
2280     /* construct our default format */
2281     } else {
2282     size_t fmt_len = 30;
2283 vapier 1.186 out_format = xmalloc(sizeof(char) * fmt_len);
2284 vapier 1.194 *out_format = '\0';
2285 vapier 1.76 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2286     if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2287 solar 1.180 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2288 solar 1.190 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2289 solar 1.181 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2290 solar 1.191 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2291     if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2292 vapier 1.76 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2293     if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2294     if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2295     if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2296     if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2297     if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2298 vapier 1.84 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2299 vapier 1.76 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2300     if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2301 solar 1.124 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2302 vapier 1.76 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2303     if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2304 vapier 1.39 }
2305 vapier 1.41 if (be_verbose > 2) printf("Format: %s\n", out_format);
2306 vapier 1.39
2307     /* now lets actually do the scanning */
2308 vapier 1.240 if (load_cache_config)
2309     load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2310 vapier 1.10 if (scan_ldpath) scanelf_ldpath();
2311     if (scan_envpath) scanelf_envpath();
2312 solar 1.153 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2313 vapier 1.133 from_file = "-";
2314 solar 1.45 if (from_file) {
2315     scanelf_from_file(from_file);
2316     from_file = *argv;
2317     }
2318     if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2319 vapier 1.25 err("Nothing to scan !?");
2320 vapier 1.66 while (optind < argc) {
2321     search_path = argv[optind++];
2322 solar 1.164 ret = scanelf_dir(search_path);
2323 vapier 1.66 }
2324 vapier 1.27
2325 vapier 1.39 /* clean up */
2326 vapier 1.227 xarrayfree(ldpaths);
2327     xarrayfree(find_lib_arr);
2328     xarrayfree(find_section_arr);
2329 vapier 1.226 free(find_lib);
2330     free(find_section);
2331 solar 1.96
2332     if (ldcache != 0)
2333     munmap(ldcache, ldcache_size);
2334 solar 1.164 return ret;
2335 vapier 1.10 }
2336    
2337 vapier 1.150 static char **get_split_env(const char *envvar)
2338     {
2339 vapier 1.152 const char *delims = " \t\n";
2340 solar 1.143 char **envvals = NULL;
2341 vapier 1.152 char *env, *s;
2342 kevquinn 1.142 int nentry;
2343    
2344 solar 1.143 if ((env = getenv(envvar)) == NULL)
2345     return NULL;
2346 kevquinn 1.142
2347 solar 1.143 env = xstrdup(env);
2348     if (env == NULL)
2349     return NULL;
2350 kevquinn 1.142
2351 vapier 1.152 s = strtok(env, delims);
2352     if (s == NULL) {
2353     free(env);
2354     return NULL;
2355     }
2356    
2357 solar 1.143 nentry = 0;
2358 vapier 1.152 while (s != NULL) {
2359     ++nentry;
2360     envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2361     envvals[nentry-1] = s;
2362     s = strtok(NULL, delims);
2363 kevquinn 1.142 }
2364 vapier 1.152 envvals[nentry] = NULL;
2365 kevquinn 1.142
2366 vapier 1.152 /* don't want to free(env) as it contains the memory that backs
2367     * the envvals array of strings */
2368 kevquinn 1.142 return envvals;
2369     }
2370 solar 1.181
2371 vapier 1.184 static void parseenv(void)
2372 vapier 1.150 {
2373 vapier 1.221 color_init(false);
2374 vapier 1.150 qa_textrels = get_split_env("QA_TEXTRELS");
2375     qa_execstack = get_split_env("QA_EXECSTACK");
2376     qa_wx_load = get_split_env("QA_WX_LOAD");
2377 vapier 1.41 }
2378 solar 1.163
2379 vapier 1.152 #ifdef __PAX_UTILS_CLEANUP
2380 vapier 1.184 static void cleanup(void)
2381 vapier 1.152 {
2382     free(out_format);
2383     free(qa_textrels);
2384     free(qa_execstack);
2385     free(qa_wx_load);
2386     }
2387     #endif
2388 vapier 1.41
2389 vapier 1.10 int main(int argc, char *argv[])
2390 solar 1.1 {
2391 solar 1.164 int ret;
2392 vapier 1.10 if (argc < 2)
2393     usage(EXIT_FAILURE);
2394 kevquinn 1.142 parseenv();
2395 solar 1.164 ret = parseargs(argc, argv);
2396 solar 1.21 fclose(stdout);
2397 vapier 1.152 #ifdef __PAX_UTILS_CLEANUP
2398     cleanup();
2399     warn("The calls to add/delete heap should be off:\n"
2400 vapier 1.232 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2401 vapier 1.152 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2402 solar 1.61 #endif
2403 solar 1.164 return ret;
2404 solar 1.1 }
2405 vapier 1.155
2406     /* Match filename against entries in matchlist, return TRUE
2407     * if the file is listed */
2408     static int file_matches_list(const char *filename, char **matchlist)
2409     {
2410     char **file;
2411     char *match;
2412     char buf[__PAX_UTILS_PATH_MAX];
2413    
2414     if (matchlist == NULL)
2415     return 0;
2416    
2417     for (file = matchlist; *file != NULL; file++) {
2418     if (search_path) {
2419     snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2420     match = buf;
2421     } else {
2422     match = *file;
2423     }
2424     if (fnmatch(match, filename, 0) == 0)
2425     return 1;
2426     }
2427     return 0;
2428     }

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