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Revision 1.251 - (hide annotations) (download) (as text)
Sat Nov 10 09:43:00 2012 UTC (2 years, 1 month ago) by vapier
Branch: MAIN
Changes since 1.250: +19 -2 lines
File MIME type: text/x-csrc
scanelf: use PT_INTERP if .interp could not be found

1 solar 1.1 /*
2 vapier 1.247 * Copyright 2003-2012 Gentoo Foundation
3 solar 1.1 * Distributed under the terms of the GNU General Public License v2
4 vapier 1.251 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.250 2012/11/04 08:25:41 vapier Exp $
5 solar 1.1 *
6 vapier 1.247 * Copyright 2003-2012 Ned Ludd - <solar@gentoo.org>
7     * Copyright 2004-2012 Mike Frysinger - <vapier@gentoo.org>
8 solar 1.1 */
9    
10 vapier 1.251 static const char rcsid[] = "$Id: scanelf.c,v 1.250 2012/11/04 08:25:41 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 1.248 static array_t _find_sym_arr = array_init_decl, *find_sym_arr = &_find_sym_arr;
50 vapier 1.249 static array_t _find_sym_regex_arr = array_init_decl, *find_sym_regex_arr = &_find_sym_regex_arr;
51 vapier 1.72 static char *find_lib = NULL;
52 vapier 1.226 static array_t _find_lib_arr = array_init_decl, *find_lib_arr = &_find_lib_arr;
53 solar 1.124 static char *find_section = NULL;
54 vapier 1.226 static array_t _find_section_arr = array_init_decl, *find_section_arr = &_find_section_arr;
55 vapier 1.39 static char *out_format = NULL;
56 vapier 1.66 static char *search_path = NULL;
57 vapier 1.101 static char fix_elf = 0;
58 solar 1.176 static char g_match = 0;
59 vapier 1.102 static char use_ldcache = 0;
60 vapier 1.240 static char use_ldpath = 0;
61 solar 1.1
62 kevquinn 1.142 static char **qa_textrels = NULL;
63     static char **qa_execstack = NULL;
64 kevquinn 1.145 static char **qa_wx_load = NULL;
65 vapier 1.232 static int root_fd = AT_FDCWD;
66 kevquinn 1.142
67 vapier 1.203 static int match_bits = 0;
68     static unsigned int match_perms = 0;
69 vapier 1.212 static void *ldcache = NULL;
70 vapier 1.203 static size_t ldcache_size = 0;
71     static unsigned long setpax = 0UL;
72 solar 1.96
73 vapier 1.203 static int has_objdump = 0;
74 solar 1.175
75 solar 1.174 /* find the path to a file by name */
76 vapier 1.230 static int bin_in_path(const char *fname)
77 solar 1.170 {
78 vapier 1.230 char fullpath[__PAX_UTILS_PATH_MAX];
79 vapier 1.172 char *path, *p;
80 solar 1.170
81 vapier 1.172 path = getenv("PATH");
82     if (!path)
83 vapier 1.230 return 0;
84 solar 1.170
85 vapier 1.172 while ((p = strrchr(path, ':')) != NULL) {
86 solar 1.170 snprintf(fullpath, sizeof(fullpath), "%s/%s", p + 1, fname);
87 vapier 1.172 *p = 0;
88 vapier 1.230 if (access(fullpath, R_OK) != -1)
89     return 1;
90 vapier 1.172 }
91 vapier 1.230
92     return 0;
93 solar 1.170 }
94 vapier 1.152
95 vapier 1.232 static FILE *fopenat_r(int dir_fd, const char *path)
96     {
97     int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
98     if (fd == -1)
99     return NULL;
100     return fdopen(fd, "re");
101     }
102    
103     static const char *root_rel_path(const char *path)
104     {
105     /*
106     * openat() will ignore the dirfd if path starts with
107     * a /, so consume all of that noise
108     *
109     * XXX: we don't handle relative paths like ../ that
110     * break out of the --root option, but for now, just
111     * don't do that :P.
112     */
113     if (root_fd != AT_FDCWD) {
114     while (*path == '/')
115     ++path;
116     if (*path == '\0')
117     path = ".";
118     }
119    
120     return path;
121     }
122    
123     /* sub-funcs for scanelf_fileat() */
124 vapier 1.234 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **str)
125 vapier 1.77 {
126     /* find the best SHT_DYNSYM and SHT_STRTAB sections */
127 vapier 1.213
128     /* debug sections */
129     void *symtab = elf_findsecbyname(elf, ".symtab");
130     void *strtab = elf_findsecbyname(elf, ".strtab");
131     /* runtime sections */
132     void *dynsym = elf_findsecbyname(elf, ".dynsym");
133     void *dynstr = elf_findsecbyname(elf, ".dynstr");
134    
135 vapier 1.244 /*
136     * If the sections are marked NOBITS, then they don't exist, so we just
137     * skip them. This let's us work sanely with splitdebug ELFs (rather
138     * than spewing a lot of "corrupt ELF" messages later on). In malformed
139     * ELFs, the section might be wrongly set to NOBITS, but screw em.
140     */
141 vapier 1.77 #define GET_SYMTABS(B) \
142     if (elf->elf_class == ELFCLASS ## B) { \
143 vapier 1.244 Elf ## B ## _Shdr *esymtab = symtab; \
144     Elf ## B ## _Shdr *estrtab = strtab; \
145     Elf ## B ## _Shdr *edynsym = dynsym; \
146     Elf ## B ## _Shdr *edynstr = dynstr; \
147     \
148     if (symtab && EGET(esymtab->sh_type) == SHT_NOBITS) \
149     symtab = NULL; \
150     if (dynsym && EGET(edynsym->sh_type) == SHT_NOBITS) \
151     dynsym = NULL; \
152     if (symtab && dynsym) \
153 vapier 1.213 *sym = (EGET(esymtab->sh_size) > EGET(edynsym->sh_size)) ? symtab : dynsym; \
154 vapier 1.244 else \
155 vapier 1.213 *sym = symtab ? symtab : dynsym; \
156 vapier 1.244 \
157     if (strtab && EGET(estrtab->sh_type) == SHT_NOBITS) \
158     strtab = NULL; \
159     if (dynstr && EGET(edynstr->sh_type) == SHT_NOBITS) \
160     dynstr = NULL; \
161     if (strtab && dynstr) \
162 vapier 1.234 *str = (EGET(estrtab->sh_size) > EGET(edynstr->sh_size)) ? strtab : dynstr; \
163 vapier 1.244 else \
164 vapier 1.234 *str = strtab ? strtab : dynstr; \
165 vapier 1.77 }
166     GET_SYMTABS(32)
167     GET_SYMTABS(64)
168 vapier 1.234
169     if (*sym && *str)
170     return;
171    
172     /*
173     * damn, they're really going to make us work for it huh?
174     * reconstruct the section header info out of the dynamic
175     * tags so we can see what symbols this guy uses at runtime.
176     */
177     #define GET_SYMTABS_DT(B) \
178     if (elf->elf_class == ELFCLASS ## B) { \
179     size_t i; \
180     static Elf ## B ## _Shdr sym_shdr, str_shdr; \
181     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
182     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
183     Elf ## B ## _Addr vsym, vstr, vhash, vgnu_hash; \
184     Elf ## B ## _Dyn *dyn; \
185     Elf ## B ## _Off offset; \
186     \
187     /* lookup symbols used at runtime with DT_SYMTAB / DT_STRTAB */ \
188     vsym = vstr = vhash = vgnu_hash = 0; \
189     memset(&sym_shdr, 0, sizeof(sym_shdr)); \
190     memset(&str_shdr, 0, sizeof(str_shdr)); \
191     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
192     if (EGET(phdr[i].p_type) != PT_DYNAMIC) \
193     continue; \
194     \
195     offset = EGET(phdr[i].p_offset); \
196     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
197     continue; \
198     \
199     dyn = DYN ## B (elf->vdata + offset); \
200     while (EGET(dyn->d_tag) != DT_NULL) { \
201     switch (EGET(dyn->d_tag)) { \
202     case DT_SYMTAB: vsym = EGET(dyn->d_un.d_val); break; \
203     case DT_SYMENT: sym_shdr.sh_entsize = dyn->d_un.d_val; break; \
204     case DT_STRTAB: vstr = EGET(dyn->d_un.d_val); break; \
205     case DT_STRSZ: str_shdr.sh_size = dyn->d_un.d_val; break; \
206     case DT_HASH: vhash = EGET(dyn->d_un.d_val); break; \
207     /*case DT_GNU_HASH: vgnu_hash = EGET(dyn->d_un.d_val); break;*/ \
208     } \
209     ++dyn; \
210     } \
211     if (vsym && vstr) \
212     break; \
213     } \
214     if (!vsym || !vstr || !(vhash || vgnu_hash)) \
215     return; \
216     \
217     /* calc offset into the ELF by finding the load addr of the syms */ \
218     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
219     Elf ## B ## _Addr vaddr = EGET(phdr[i].p_vaddr); \
220     Elf ## B ## _Addr filesz = EGET(phdr[i].p_filesz); \
221     offset = EGET(phdr[i].p_offset); \
222     \
223     if (EGET(phdr[i].p_type) != PT_LOAD) \
224     continue; \
225     \
226     if (vhash >= vaddr && vhash < vaddr + filesz) { \
227     /* Scan the hash table to see how many entries we have */ \
228     Elf32_Word max_sym_idx = 0; \
229     Elf32_Word *hashtbl = elf->vdata + offset + (vhash - vaddr); \
230     Elf32_Word b, nbuckets = EGET(hashtbl[0]); \
231     Elf32_Word nchains = EGET(hashtbl[1]); \
232     Elf32_Word *buckets = &hashtbl[2]; \
233     Elf32_Word *chains = &buckets[nbuckets]; \
234     Elf32_Word sym_idx; \
235     \
236     for (b = 0; b < nbuckets; ++b) { \
237     if (!buckets[b]) \
238     continue; \
239     for (sym_idx = buckets[b]; sym_idx < nchains && sym_idx; sym_idx = chains[sym_idx]) \
240     if (max_sym_idx < sym_idx) \
241     max_sym_idx = sym_idx; \
242     } \
243     ESET(sym_shdr.sh_size, sym_shdr.sh_entsize * max_sym_idx); \
244     } \
245     \
246     if (vsym >= vaddr && vsym < vaddr + filesz) { \
247     ESET(sym_shdr.sh_offset, offset + (vsym - vaddr)); \
248     *sym = &sym_shdr; \
249     } \
250     \
251     if (vstr >= vaddr && vstr < vaddr + filesz) { \
252     ESET(str_shdr.sh_offset, offset + (vstr - vaddr)); \
253     *str = &str_shdr; \
254     } \
255     } \
256     }
257     GET_SYMTABS_DT(32)
258     GET_SYMTABS_DT(64)
259 vapier 1.77 }
260 solar 1.127
261 vapier 1.41 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
262 solar 1.6 {
263 solar 1.61 static char ret[7];
264     unsigned long i, shown;
265    
266 vapier 1.41 if (!show_pax) return NULL;
267 vapier 1.10
268 solar 1.61 shown = 0;
269     memset(&ret, 0, sizeof(ret));
270    
271     if (elf->phdr) {
272     #define SHOW_PAX(B) \
273     if (elf->elf_class == ELFCLASS ## B) { \
274     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
275     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
276     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
277     if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
278     continue; \
279 solar 1.127 if (fix_elf && setpax) { \
280     /* set the paxctl flags */ \
281     ESET(phdr[i].p_flags, setpax); \
282     } \
283 solar 1.129 if (be_quiet && (EGET(phdr[i].p_flags) == (PF_NOEMUTRAMP | PF_NORANDEXEC))) \
284 solar 1.61 continue; \
285     memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
286     *found_pax = 1; \
287     ++shown; \
288     break; \
289     } \
290     }
291     SHOW_PAX(32)
292     SHOW_PAX(64)
293     }
294    
295 vapier 1.242 /* Note: We do not support setting EI_PAX if not PT_PAX_FLAGS
296     * was found. This is known to break ELFs on glibc systems,
297     * and mainline PaX has deprecated use of this for a long time.
298     * We could support changing PT_GNU_STACK, but that doesn't
299     * seem like it's worth the effort. #411919
300     */
301 solar 1.128
302 solar 1.61 /* fall back to EI_PAX if no PT_PAX was found */
303     if (!*ret) {
304 vapier 1.90 static char *paxflags;
305 solar 1.61 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
306     if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
307     *found_pax = 1;
308 solar 1.127 return (be_wewy_wewy_quiet ? NULL : paxflags);
309 solar 1.61 }
310     strncpy(ret, paxflags, sizeof(ret));
311 vapier 1.14 }
312 vapier 1.41
313 solar 1.127 if (be_wewy_wewy_quiet || (be_quiet && !shown))
314 solar 1.61 return NULL;
315 vapier 1.90 else
316     return ret;
317     }
318 solar 1.61
319 solar 1.73 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
320 vapier 1.39 {
321 vapier 1.71 static char ret[12];
322 vapier 1.41 char *found;
323 vapier 1.99 unsigned long i, shown, multi_stack, multi_relro, multi_load;
324     int max_pt_load;
325 vapier 1.41
326 solar 1.73 if (!show_phdr) return NULL;
327 vapier 1.41
328 vapier 1.71 memcpy(ret, "--- --- ---\0", 12);
329    
330 vapier 1.41 shown = 0;
331 vapier 1.71 multi_stack = multi_relro = multi_load = 0;
332 vapier 1.99 max_pt_load = elf_max_pt_load(elf);
333 vapier 1.44
334 vapier 1.108 #define NOTE_GNU_STACK ".note.GNU-stack"
335 solar 1.73 #define SHOW_PHDR(B) \
336 vapier 1.39 if (elf->elf_class == ELFCLASS ## B) { \
337     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
338 vapier 1.91 Elf ## B ## _Off offset; \
339     uint32_t flags, check_flags; \
340     if (elf->phdr != NULL) { \
341     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
342     for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
343     if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
344 vapier 1.152 if (multi_stack++) \
345     warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
346     if (file_matches_list(elf->filename, qa_execstack)) \
347     continue; \
348     found = found_phdr; \
349     offset = 0; \
350     check_flags = PF_X; \
351 vapier 1.91 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
352 vapier 1.152 if (multi_relro++) \
353     warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
354 vapier 1.91 found = found_relro; \
355     offset = 4; \
356     check_flags = PF_X; \
357     } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
358 solar 1.188 if (EGET(ehdr->e_type) == ET_DYN || EGET(ehdr->e_type) == ET_EXEC) \
359 vapier 1.152 if (multi_load++ > max_pt_load) \
360     warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
361     if (file_matches_list(elf->filename, qa_wx_load)) \
362     continue; \
363     found = found_load; \
364     offset = 8; \
365     check_flags = PF_W|PF_X; \
366 vapier 1.91 } else \
367     continue; \
368     flags = EGET(phdr[i].p_flags); \
369     if (be_quiet && ((flags & check_flags) != check_flags)) \
370     continue; \
371 solar 1.130 if ((EGET(phdr[i].p_type) != PT_LOAD) && (fix_elf && ((flags & PF_X) != flags))) { \
372 vapier 1.101 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
373     ret[3] = ret[7] = '!'; \
374     flags = EGET(phdr[i].p_flags); \
375     } \
376 vapier 1.91 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
377     *found = 1; \
378     ++shown; \
379     } \
380     } else if (elf->shdr != NULL) { \
381     /* no program headers which means this is prob an object file */ \
382     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
383     Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
384 vapier 1.108 char *str; \
385 vapier 1.217 if ((void*)strtbl > elf->data_end) \
386 vapier 1.108 goto skip_this_shdr##B; \
387 vapier 1.91 check_flags = SHF_WRITE|SHF_EXECINSTR; \
388     for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
389     if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
390     offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
391 vapier 1.108 str = elf->data + offset; \
392     if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
393     if (!strcmp(str, NOTE_GNU_STACK)) { \
394 vapier 1.91 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
395     flags = EGET(shdr[i].sh_flags); \
396     if (be_quiet && ((flags & check_flags) != check_flags)) \
397     continue; \
398     ++*found_phdr; \
399     shown = 1; \
400     if (flags & SHF_WRITE) ret[0] = 'W'; \
401     if (flags & SHF_ALLOC) ret[1] = 'A'; \
402     if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
403     if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
404     break; \
405     } \
406     } \
407 vapier 1.108 skip_this_shdr##B: \
408 vapier 1.91 if (!multi_stack) { \
409 vapier 1.158 if (file_matches_list(elf->filename, qa_execstack)) \
410     return NULL; \
411 vapier 1.91 *found_phdr = 1; \
412     shown = 1; \
413     memcpy(ret, "!WX", 3); \
414     } \
415 vapier 1.39 } \
416     }
417 solar 1.73 SHOW_PHDR(32)
418     SHOW_PHDR(64)
419 vapier 1.44
420 solar 1.127 if (be_wewy_wewy_quiet || (be_quiet && !shown))
421 vapier 1.41 return NULL;
422     else
423     return ret;
424 vapier 1.39 }
425 kevquinn 1.142
426 vapier 1.186 /*
427     * See if this ELF contains a DT_TEXTREL tag in any of its
428     * PT_DYNAMIC sections.
429     */
430 vapier 1.90 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
431 vapier 1.39 {
432 vapier 1.90 static const char *ret = "TEXTREL";
433 vapier 1.44 unsigned long i;
434 vapier 1.41
435 vapier 1.79 if (!show_textrel && !show_textrels) return NULL;
436 vapier 1.41
437 kevquinn 1.142 if (file_matches_list(elf->filename, qa_textrels)) return NULL;
438    
439 vapier 1.44 if (elf->phdr) {
440 vapier 1.39 #define SHOW_TEXTREL(B) \
441     if (elf->elf_class == ELFCLASS ## B) { \
442     Elf ## B ## _Dyn *dyn; \
443     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
444     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
445 vapier 1.44 Elf ## B ## _Off offset; \
446 vapier 1.39 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
447 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
448 vapier 1.44 offset = EGET(phdr[i].p_offset); \
449     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
450 vapier 1.217 dyn = DYN ## B (elf->vdata + offset); \
451 vapier 1.39 while (EGET(dyn->d_tag) != DT_NULL) { \
452     if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
453     *found_textrel = 1; \
454     /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
455 solar 1.127 return (be_wewy_wewy_quiet ? NULL : ret); \
456 vapier 1.39 } \
457     ++dyn; \
458 vapier 1.26 } \
459 vapier 1.39 } }
460     SHOW_TEXTREL(32)
461     SHOW_TEXTREL(64)
462 vapier 1.44 }
463    
464 solar 1.127 if (be_quiet || be_wewy_wewy_quiet)
465 vapier 1.41 return NULL;
466     else
467 vapier 1.90 return " - ";
468 vapier 1.39 }
469 solar 1.180
470 vapier 1.186 /*
471     * Scan the .text section to see if there are any relocations in it.
472     * Should rewrite this to check PT_LOAD sections that are marked
473     * Executable rather than the section named '.text'.
474     */
475 vapier 1.79 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
476 vapier 1.76 {
477 vapier 1.82 unsigned long s, r, rmax;
478     void *symtab_void, *strtab_void, *text_void;
479 vapier 1.76
480     if (!show_textrels) return NULL;
481    
482 vapier 1.79 /* don't search for TEXTREL's if the ELF doesn't have any */
483     if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
484     if (!*found_textrel) return NULL;
485    
486 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
487 vapier 1.82 text_void = elf_findsecbyname(elf, ".text");
488 vapier 1.76
489 vapier 1.82 if (symtab_void && strtab_void && text_void && elf->shdr) {
490 vapier 1.76 #define SHOW_TEXTRELS(B) \
491     if (elf->elf_class == ELFCLASS ## B) { \
492     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
493     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
494     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
495     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
496 vapier 1.82 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
497     Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
498     uint ## B ## _t memsz = EGET(text->sh_size); \
499 vapier 1.76 Elf ## B ## _Rel *rel; \
500     Elf ## B ## _Rela *rela; \
501     /* search the section headers for relocations */ \
502     for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
503     uint32_t sh_type = EGET(shdr[s].sh_type); \
504     if (sh_type == SHT_REL) { \
505 vapier 1.217 rel = REL ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
506 vapier 1.76 rela = NULL; \
507     rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
508     } else if (sh_type == SHT_RELA) { \
509     rel = NULL; \
510 vapier 1.217 rela = RELA ## B (elf->vdata + EGET(shdr[s].sh_offset)); \
511 vapier 1.76 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
512     } else \
513     continue; \
514 vapier 1.82 /* now see if any of the relocs are in the .text */ \
515     for (r = 0; r < rmax; ++r) { \
516     unsigned long sym_max; \
517     Elf ## B ## _Addr offset_tmp; \
518     Elf ## B ## _Sym *func; \
519     Elf ## B ## _Sym *sym; \
520     Elf ## B ## _Addr r_offset; \
521     uint ## B ## _t r_info; \
522     if (sh_type == SHT_REL) { \
523     r_offset = EGET(rel[r].r_offset); \
524     r_info = EGET(rel[r].r_info); \
525     } else { \
526     r_offset = EGET(rela[r].r_offset); \
527     r_info = EGET(rela[r].r_info); \
528     } \
529     /* make sure this relocation is inside of the .text */ \
530     if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
531     if (be_verbose <= 2) continue; \
532     } else \
533 vapier 1.78 *found_textrels = 1; \
534 vapier 1.82 /* locate this relocation symbol name */ \
535 vapier 1.217 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
536     if ((void*)sym > elf->data_end) { \
537 vapier 1.111 warn("%s: corrupt ELF symbol", elf->filename); \
538 vapier 1.109 continue; \
539     } \
540 vapier 1.82 sym_max = ELF ## B ## _R_SYM(r_info); \
541     if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
542     sym += sym_max; \
543     else \
544     sym = NULL; \
545     sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
546     /* show the raw details about this reloc */ \
547 vapier 1.88 printf(" %s: ", elf->base_filename); \
548 vapier 1.82 if (sym && sym->st_name) \
549 vapier 1.217 printf("%s", elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
550 vapier 1.82 else \
551 vapier 1.169 printf("(memory/data?)"); \
552 vapier 1.82 printf(" [0x%lX]", (unsigned long)r_offset); \
553     /* now try to find the closest symbol that this rel is probably in */ \
554 vapier 1.217 sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
555 vapier 1.82 func = NULL; \
556     offset_tmp = 0; \
557     while (sym_max--) { \
558     if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
559     func = sym; \
560     offset_tmp = EGET(sym->st_value); \
561 vapier 1.76 } \
562 vapier 1.82 ++sym; \
563 vapier 1.76 } \
564 vapier 1.82 printf(" in "); \
565 vapier 1.169 if (func && func->st_name) { \
566     const char *func_name = elf->data + EGET(strtab->sh_offset) + EGET(func->st_name); \
567     if (r_offset > EGET(func->st_size)) \
568     printf("(optimized out: previous %s)", func_name); \
569     else \
570     printf("%s", func_name); \
571     } else \
572     printf("(optimized out)"); \
573 vapier 1.82 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
574 solar 1.170 if (be_verbose && has_objdump) { \
575 vapier 1.187 Elf ## B ## _Addr end_addr = offset_tmp + EGET(func->st_size); \
576 vapier 1.167 char *sysbuf; \
577     size_t syslen; \
578     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"; \
579     syslen = sizeof(sysfmt) + strlen(elf->filename) + 3 * sizeof(unsigned long) + 1; \
580     sysbuf = xmalloc(syslen); \
581 vapier 1.187 if (end_addr < r_offset) \
582     /* not uncommon when things are optimized out */ \
583     end_addr = r_offset + 0x100; \
584     snprintf(sysbuf, syslen, sysfmt, \
585     (unsigned long)offset_tmp, \
586     (unsigned long)end_addr, \
587     elf->filename, \
588     (unsigned long)r_offset); \
589     fflush(stdout); \
590 vapier 1.232 if (system(sysbuf)) /* don't care */; \
591 vapier 1.187 fflush(stdout); \
592     free(sysbuf); \
593 vapier 1.167 } \
594 vapier 1.76 } \
595     } }
596     SHOW_TEXTRELS(32)
597     SHOW_TEXTRELS(64)
598     }
599 vapier 1.82 if (!*found_textrels)
600     warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
601 vapier 1.76
602     return NULL;
603     }
604 solar 1.83
605 vapier 1.102 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
606 vapier 1.100 {
607 solar 1.83 struct stat st;
608 vapier 1.84 switch (*item) {
609 vapier 1.89 case '/': break;
610     case '.':
611 vapier 1.102 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
612 vapier 1.89 break;
613 vapier 1.100 case ':':
614 vapier 1.89 case '\0':
615 vapier 1.102 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
616 solar 1.83 break;
617     case '$':
618 vapier 1.84 if (fstat(elf->fd, &st) != -1)
619 solar 1.83 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
620 vapier 1.157 warnf("Security problem with %s='%s' in %s with mode set of %o",
621 solar 1.176 dt_type, item, elf->filename, (unsigned int) st.st_mode & 07777);
622 solar 1.83 break;
623     default:
624 vapier 1.102 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
625 solar 1.83 break;
626     }
627     }
628 vapier 1.41 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
629 vapier 1.39 {
630 vapier 1.227 unsigned long i;
631 vapier 1.48 char *rpath, *runpath, **r;
632 vapier 1.39 void *strtbl_void;
633 vapier 1.10
634 vapier 1.39 if (!show_rpath) return;
635 vapier 1.10
636 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
637     rpath = runpath = NULL;
638 vapier 1.10
639 vapier 1.44 if (elf->phdr && strtbl_void) {
640 vapier 1.26 #define SHOW_RPATH(B) \
641     if (elf->elf_class == ELFCLASS ## B) { \
642     Elf ## B ## _Dyn *dyn; \
643     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
644     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
645     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
646 vapier 1.44 Elf ## B ## _Off offset; \
647 vapier 1.60 Elf ## B ## _Xword word; \
648 vapier 1.48 /* Scan all the program headers */ \
649 vapier 1.26 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
650 vapier 1.48 /* Just scan dynamic headers */ \
651 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
652 vapier 1.44 offset = EGET(phdr[i].p_offset); \
653     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
654 vapier 1.48 /* Just scan dynamic RPATH/RUNPATH headers */ \
655 vapier 1.217 dyn = DYN ## B (elf->vdata + offset); \
656 vapier 1.48 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
657     if (word == DT_RPATH) { \
658     r = &rpath; \
659     } else if (word == DT_RUNPATH) { \
660     r = &runpath; \
661     } else { \
662     ++dyn; \
663     continue; \
664     } \
665     /* Verify the memory is somewhat sane */ \
666     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
667 vapier 1.69 if (offset < (Elf ## B ## _Off)elf->len) { \
668 vapier 1.48 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
669 vapier 1.217 *r = elf->data + offset; \
670 vapier 1.103 /* cache the length in case we need to nuke this section later on */ \
671     if (fix_elf) \
672     offset = strlen(*r); \
673 vapier 1.48 /* If quiet, don't output paths in ld.so.conf */ \
674 vapier 1.69 if (be_quiet) { \
675     size_t len; \
676     char *start, *end; \
677 vapier 1.75 /* note that we only 'chop' off leading known paths. */ \
678     /* since *r is read-only memory, we can only move the ptr forward. */ \
679     start = *r; \
680     /* scan each path in : delimited list */ \
681     while (start) { \
682 vapier 1.102 rpath_security_checks(elf, start, get_elfdtype(word)); \
683 vapier 1.69 end = strchr(start, ':'); \
684 vapier 1.75 len = (end ? abs(end - start) : strlen(start)); \
685 vapier 1.227 if (use_ldcache) { \
686     size_t n; \
687     const char *ldpath; \
688     array_for_each(ldpaths, n, ldpath) \
689     if (!strncmp(ldpath, start, len) && !ldpath[len]) { \
690 vapier 1.102 *r = end; \
691     /* corner case ... if RPATH reads "/usr/lib:", we want \
692     * to show ':' rather than '' */ \
693     if (end && end[1] != '\0') \
694     (*r)++; \
695     break; \
696     } \
697 vapier 1.227 } \
698 vapier 1.100 if (!*r || !end) \
699     break; \
700 vapier 1.75 else \
701     start = start + len + 1; \
702 vapier 1.69 } \
703     } \
704 vapier 1.101 if (*r) { \
705 solar 1.107 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
706 vapier 1.101 /* just nuke it */ \
707     nuke_it##B: \
708 vapier 1.103 memset(*r, 0x00, offset); \
709 vapier 1.102 *r = NULL; \
710 vapier 1.101 ESET(dyn->d_tag, DT_DEBUG); \
711 vapier 1.103 ESET(dyn->d_un.d_ptr, 0); \
712 vapier 1.101 } else if (fix_elf) { \
713     /* try to clean "bad" paths */ \
714     size_t len, tmpdir_len; \
715     char *start, *end; \
716     const char *tmpdir; \
717     start = *r; \
718     tmpdir = (getenv("TMPDIR") ? : "."); \
719     tmpdir_len = strlen(tmpdir); \
720     while (1) { \
721     end = strchr(start, ':'); \
722     if (start == end) { \
723     eat_this_path##B: \
724     len = strlen(end); \
725     memmove(start, end+1, len); \
726     start[len-1] = '\0'; \
727     end = start - 1; \
728     } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
729     if (!end) { \
730     if (start == *r) \
731     goto nuke_it##B; \
732     *--start = '\0'; \
733     } else \
734     goto eat_this_path##B; \
735     } \
736     if (!end) \
737     break; \
738     start = end + 1; \
739     } \
740 vapier 1.102 if (**r == '\0') \
741     goto nuke_it##B; \
742 vapier 1.101 } \
743 vapier 1.102 if (*r) \
744     *found_rpath = 1; \
745 vapier 1.101 } \
746 vapier 1.26 } \
747     ++dyn; \
748     } \
749     } }
750     SHOW_RPATH(32)
751     SHOW_RPATH(64)
752 vapier 1.10 }
753 vapier 1.41
754 solar 1.127 if (be_wewy_wewy_quiet) return;
755 vapier 1.70
756 vapier 1.39 if (rpath && runpath) {
757 vapier 1.41 if (!strcmp(rpath, runpath)) {
758     xstrcat(ret, runpath, ret_len);
759     } else {
760 vapier 1.39 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
761 vapier 1.41 xchrcat(ret, '{', ret_len);
762     xstrcat(ret, rpath, ret_len);
763     xchrcat(ret, ',', ret_len);
764     xstrcat(ret, runpath, ret_len);
765     xchrcat(ret, '}', ret_len);
766 vapier 1.39 }
767     } else if (rpath || runpath)
768 vapier 1.41 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
769     else if (!be_quiet)
770     xstrcat(ret, " - ", ret_len);
771 vapier 1.39 }
772 solar 1.96
773     #define LDSO_CACHE_MAGIC "ld.so-"
774     #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
775     #define LDSO_CACHE_VER "1.7.0"
776     #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
777 vapier 1.97 #define FLAG_ANY -1
778     #define FLAG_TYPE_MASK 0x00ff
779     #define FLAG_LIBC4 0x0000
780     #define FLAG_ELF 0x0001
781     #define FLAG_ELF_LIBC5 0x0002
782     #define FLAG_ELF_LIBC6 0x0003
783     #define FLAG_REQUIRED_MASK 0xff00
784     #define FLAG_SPARC_LIB64 0x0100
785     #define FLAG_IA64_LIB64 0x0200
786     #define FLAG_X8664_LIB64 0x0300
787     #define FLAG_S390_LIB64 0x0400
788     #define FLAG_POWERPC_LIB64 0x0500
789     #define FLAG_MIPS64_LIBN32 0x0600
790     #define FLAG_MIPS64_LIBN64 0x0700
791 solar 1.96
792 flameeyes 1.141 #if defined(__GLIBC__) || defined(__UCLIBC__)
793 vapier 1.148
794 vapier 1.240 static char *lookup_cache_lib(elfobj *elf, const char *fname)
795 solar 1.96 {
796 vapier 1.212 int fd;
797 solar 1.96 char *strs;
798 vapier 1.104 static char buf[__PAX_UTILS_PATH_MAX] = "";
799 vapier 1.232 const char *cachefile = root_rel_path("/etc/ld.so.cache");
800 solar 1.96 struct stat st;
801    
802     typedef struct {
803     char magic[LDSO_CACHE_MAGIC_LEN];
804     char version[LDSO_CACHE_VER_LEN];
805     int nlibs;
806     } header_t;
807 vapier 1.97 header_t *header;
808 solar 1.96
809     typedef struct {
810     int flags;
811     int sooffset;
812     int liboffset;
813     } libentry_t;
814     libentry_t *libent;
815    
816     if (fname == NULL)
817     return NULL;
818    
819 vapier 1.212 if (ldcache == NULL) {
820 vapier 1.232 if (fstatat(root_fd, cachefile, &st, 0))
821 vapier 1.212 return NULL;
822    
823 vapier 1.232 fd = openat(root_fd, cachefile, O_RDONLY);
824 vapier 1.212 if (fd == -1)
825 solar 1.96 return NULL;
826 vapier 1.97
827     /* cache these values so we only map/unmap the cache file once */
828 solar 1.96 ldcache_size = st.st_size;
829 vapier 1.212 header = ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
830 vapier 1.97 close(fd);
831 solar 1.96
832 vapier 1.202 if (ldcache == MAP_FAILED) {
833 vapier 1.212 ldcache = NULL;
834 solar 1.96 return NULL;
835 solar 1.116 }
836 solar 1.96
837 vapier 1.212 if (memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN) ||
838     memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
839     {
840     munmap(ldcache, ldcache_size);
841     ldcache = NULL;
842 solar 1.96 return NULL;
843 vapier 1.212 }
844     } else
845     header = ldcache;
846 solar 1.96
847 vapier 1.212 libent = ldcache + sizeof(header_t);
848 solar 1.96 strs = (char *) &libent[header->nlibs];
849    
850 vapier 1.212 for (fd = 0; fd < header->nlibs; ++fd) {
851     /* This should be more fine grained, but for now we assume that
852     * diff arches will not be cached together, and we ignore the
853     * the different multilib mips cases.
854     */
855 vapier 1.97 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
856     continue;
857     if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
858     continue;
859    
860 solar 1.96 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
861     continue;
862 vapier 1.212
863     /* Return first hit because that is how the ldso rolls */
864 solar 1.96 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
865 vapier 1.212 break;
866 solar 1.96 }
867 vapier 1.212
868 solar 1.96 return buf;
869     }
870 vapier 1.212
871 solar 1.154 #elif defined(__NetBSD__)
872 vapier 1.240 static char *lookup_cache_lib(elfobj *elf, const char *fname)
873 solar 1.154 {
874     static char buf[__PAX_UTILS_PATH_MAX] = "";
875     static struct stat st;
876 vapier 1.227 size_t n;
877     char *ldpath;
878 solar 1.154
879 vapier 1.227 array_for_each(ldpath, n, ldpath) {
880     if ((unsigned) snprintf(buf, sizeof(buf), "%s/%s", ldpath, fname) >= sizeof(buf))
881 solar 1.154 continue; /* if the pathname is too long, or something went wrong, ignore */
882    
883     if (stat(buf, &st) != 0)
884     continue; /* if the lib doesn't exist in *ldpath, look further */
885    
886     /* NetBSD doesn't actually do sanity checks, it just loads the file
887     * and if that doesn't work, continues looking in other directories.
888     * This cannot easily be safely emulated, unfortunately. For now,
889     * just assume that if it exists, it's a valid library. */
890 vapier 1.148
891 solar 1.154 return buf;
892     }
893    
894     /* not found in any path */
895     return NULL;
896     }
897 flameeyes 1.141 #else
898 vapier 1.192 #ifdef __ELF__
899 vapier 1.148 #warning Cache support not implemented for your target
900 vapier 1.192 #endif
901 vapier 1.240 static char *lookup_cache_lib(elfobj *elf, const char *fname)
902 flameeyes 1.141 {
903     return NULL;
904     }
905     #endif
906 solar 1.96
907 vapier 1.240 static char *lookup_config_lib(elfobj *elf, char *fname)
908     {
909     static char buf[__PAX_UTILS_PATH_MAX] = "";
910     const char *ldpath;
911     size_t n;
912    
913     array_for_each(ldpaths, n, ldpath) {
914     snprintf(buf, sizeof(buf), "%s/%s", root_rel_path(ldpath), fname);
915     if (faccessat(root_fd, buf, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
916     return buf;
917     }
918    
919     return NULL;
920     }
921    
922 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)
923 vapier 1.39 {
924 vapier 1.44 unsigned long i;
925 vapier 1.39 char *needed;
926     void *strtbl_void;
927 solar 1.96 char *p;
928 vapier 1.39
929 vapier 1.226 /*
930     * -n -> op==0 -> print all
931     * -N -> op==1 -> print requested
932     */
933     if ((op == 0 && !show_needed) || (op == 1 && !find_lib))
934     return NULL;
935 vapier 1.10
936 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
937 vapier 1.32
938 vapier 1.44 if (elf->phdr && strtbl_void) {
939 vapier 1.32 #define SHOW_NEEDED(B) \
940     if (elf->elf_class == ELFCLASS ## B) { \
941     Elf ## B ## _Dyn *dyn; \
942     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
943     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
944     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
945 vapier 1.44 Elf ## B ## _Off offset; \
946 vapier 1.226 size_t matched = 0; \
947     /* Walk all the program headers to find the PT_DYNAMIC */ \
948 vapier 1.32 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
949 vapier 1.226 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) \
950     continue; \
951 vapier 1.44 offset = EGET(phdr[i].p_offset); \
952 vapier 1.226 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) \
953     continue; \
954     /* Walk all the dynamic tags to find NEEDED entries */ \
955 vapier 1.217 dyn = DYN ## B (elf->vdata + offset); \
956 vapier 1.32 while (EGET(dyn->d_tag) != DT_NULL) { \
957     if (EGET(dyn->d_tag) == DT_NEEDED) { \
958 vapier 1.44 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
959 vapier 1.69 if (offset >= (Elf ## B ## _Off)elf->len) { \
960 vapier 1.49 ++dyn; \
961     continue; \
962     } \
963 vapier 1.217 needed = elf->data + offset; \
964 vapier 1.72 if (op == 0) { \
965 vapier 1.226 /* -n -> print all entries */ \
966 solar 1.127 if (!be_wewy_wewy_quiet) { \
967 vapier 1.72 if (*found_needed) xchrcat(ret, ',', ret_len); \
968 vapier 1.240 if (use_ldpath) { \
969     if ((p = lookup_config_lib(elf, needed)) != NULL) \
970     needed = p; \
971     } else if (use_ldcache) { \
972 vapier 1.97 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
973 solar 1.96 needed = p; \
974 vapier 1.240 } \
975 vapier 1.72 xstrcat(ret, needed, ret_len); \
976     } \
977     *found_needed = 1; \
978     } else { \
979 vapier 1.226 /* -N -> print matching entries */ \
980     size_t n; \
981     const char *find_lib_name; \
982     \
983 vapier 1.236 array_for_each(find_lib_arr, n, find_lib_name) { \
984     int invert = 1; \
985     if (find_lib_name[0] == '!') \
986     invert = 0, ++find_lib_name; \
987     if (!strcmp(find_lib_name, needed) == invert) \
988 vapier 1.226 ++matched; \
989 vapier 1.236 } \
990 vapier 1.226 \
991     if (matched == array_cnt(find_lib_arr)) { \
992 vapier 1.81 *found_lib = 1; \
993 vapier 1.226 return (be_wewy_wewy_quiet ? NULL : find_lib); \
994 vapier 1.81 } \
995 vapier 1.72 } \
996 vapier 1.32 } \
997     ++dyn; \
998     } \
999     } }
1000     SHOW_NEEDED(32)
1001     SHOW_NEEDED(64)
1002 vapier 1.85 if (op == 0 && !*found_needed && be_verbose)
1003 vapier 1.84 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
1004 vapier 1.32 }
1005 vapier 1.72
1006     return NULL;
1007 vapier 1.39 }
1008 vapier 1.41 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
1009 vapier 1.39 {
1010     void *strtbl_void;
1011    
1012 vapier 1.41 if (!show_interp) return NULL;
1013 vapier 1.32
1014 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".interp");
1015 vapier 1.38
1016 vapier 1.39 if (strtbl_void) {
1017 vapier 1.38 #define SHOW_INTERP(B) \
1018     if (elf->elf_class == ELFCLASS ## B) { \
1019 solar 1.40 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1020     *found_interp = 1; \
1021 solar 1.127 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
1022 vapier 1.38 }
1023     SHOW_INTERP(32)
1024     SHOW_INTERP(64)
1025 vapier 1.251 } else {
1026     /* Walk all the program headers to find the PT_INTERP */
1027     #define SHOW_PT_INTERP(B) \
1028     if (elf->elf_class == ELFCLASS ## B) { \
1029     unsigned long i; \
1030     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1031     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1032     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1033     if (EGET(phdr[i].p_type) != PT_INTERP) \
1034     continue; \
1035     *found_interp = 1; \
1036     return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(phdr[i].p_offset)); \
1037     } \
1038     }
1039     SHOW_PT_INTERP(32)
1040     SHOW_PT_INTERP(64)
1041 vapier 1.38 }
1042 vapier 1.251
1043 vapier 1.41 return NULL;
1044 vapier 1.39 }
1045 vapier 1.49 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
1046     {
1047     unsigned long i;
1048     struct stat s;
1049 solar 1.131 char dynamic = 0;
1050 vapier 1.49
1051     if (!show_bind) return NULL;
1052 vapier 1.51 if (!elf->phdr) return NULL;
1053 vapier 1.49
1054     #define SHOW_BIND(B) \
1055     if (elf->elf_class == ELFCLASS ## B) { \
1056     Elf ## B ## _Dyn *dyn; \
1057     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1058     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1059     Elf ## B ## _Off offset; \
1060     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1061 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1062 solar 1.131 dynamic = 1; \
1063 vapier 1.49 offset = EGET(phdr[i].p_offset); \
1064     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1065 vapier 1.217 dyn = DYN ## B (elf->vdata + offset); \
1066 vapier 1.49 while (EGET(dyn->d_tag) != DT_NULL) { \
1067     if (EGET(dyn->d_tag) == DT_BIND_NOW || \
1068     (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
1069     { \
1070     if (be_quiet) return NULL; \
1071     *found_bind = 1; \
1072 solar 1.127 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
1073 vapier 1.49 } \
1074     ++dyn; \
1075     } \
1076     } \
1077     }
1078     SHOW_BIND(32)
1079     SHOW_BIND(64)
1080    
1081 solar 1.127 if (be_wewy_wewy_quiet) return NULL;
1082 vapier 1.70
1083 vapier 1.159 /* don't output anything if quiet mode and the ELF is static or not setuid */
1084     if (be_quiet && (!dynamic || (!fstat(elf->fd, &s) && !(s.st_mode & (S_ISUID|S_ISGID))))) {
1085 vapier 1.49 return NULL;
1086     } else {
1087     *found_bind = 1;
1088 vapier 1.217 return (char *)(dynamic ? "LAZY" : "STATIC");
1089 vapier 1.49 }
1090     }
1091 vapier 1.84 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
1092     {
1093     unsigned long i;
1094     char *soname;
1095     void *strtbl_void;
1096    
1097     if (!show_soname) return NULL;
1098    
1099     strtbl_void = elf_findsecbyname(elf, ".dynstr");
1100    
1101     if (elf->phdr && strtbl_void) {
1102     #define SHOW_SONAME(B) \
1103     if (elf->elf_class == ELFCLASS ## B) { \
1104     Elf ## B ## _Dyn *dyn; \
1105     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
1106     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
1107     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
1108     Elf ## B ## _Off offset; \
1109     /* only look for soname in shared objects */ \
1110 solar 1.188 if (EGET(ehdr->e_type) != ET_DYN) \
1111 vapier 1.84 return NULL; \
1112     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
1113 vapier 1.185 if (EGET(phdr[i].p_type) != PT_DYNAMIC || EGET(phdr[i].p_filesz) == 0) continue; \
1114 vapier 1.84 offset = EGET(phdr[i].p_offset); \
1115     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
1116 vapier 1.217 dyn = DYN ## B (elf->vdata + offset); \
1117 vapier 1.84 while (EGET(dyn->d_tag) != DT_NULL) { \
1118     if (EGET(dyn->d_tag) == DT_SONAME) { \
1119     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
1120     if (offset >= (Elf ## B ## _Off)elf->len) { \
1121     ++dyn; \
1122     continue; \
1123     } \
1124 vapier 1.217 soname = elf->data + offset; \
1125 vapier 1.84 *found_soname = 1; \
1126 solar 1.127 return (be_wewy_wewy_quiet ? NULL : soname); \
1127 vapier 1.84 } \
1128     ++dyn; \
1129     } \
1130     } }
1131     SHOW_SONAME(32)
1132     SHOW_SONAME(64)
1133     }
1134    
1135     return NULL;
1136     }
1137 solar 1.177
1138 vapier 1.215 /*
1139     * We support the symbol form:
1140     * [%[modifiers]%][[+-]<symbol name>][,[.....]]
1141     * If the symbol name is empty, then all symbols are matched.
1142     * If the symbol name is a glob ("*"), then all symbols are dumped (debug).
1143     * Do not rely on this output format at all.
1144     * Otherwise the symbol name is used to search (either regex or string compare).
1145     * If the first char of the symbol name is a plus ("+"), then only match
1146     * defined symbols. If it's a minus ("-"), only match undefined symbols.
1147     * Putting modifiers in between the percent signs allows for more in depth
1148     * filters. There are groups of modifiers. If you don't specify a member
1149     * of a group, then all types in that group are matched. The current
1150     * groups and their types are:
1151 vapier 1.238 * STT group: STT_NOTYPE:n STT_OBJECT:o STT_FUNC:f STT_FILE:F
1152 vapier 1.215 * STB group: STB_LOCAL:l STB_GLOBAL:g STB_WEAK:w
1153     * SHN group: SHN_UNDEF:u SHN_ABS:a SHN_COMMON:c {defined}:d
1154     * The "defined" value in the SHN group does not correspond to a SHN_xxx define.
1155     * You can search for multiple symbols at once by seperating with a comma (",").
1156     *
1157     * Some examples:
1158     * ELFs with a weak function "foo":
1159     * scanelf -s %wf%foo <ELFs>
1160     * ELFs that define the symbol "main":
1161     * scanelf -s +main <ELFs>
1162     * scanelf -s %d%main <ELFs>
1163     * ELFs that refer to the undefined symbol "brk":
1164     * scanelf -s -brk <ELFs>
1165     * scanelf -s %u%brk <ELFs>
1166     * All global defined objects in an ELF:
1167     * scanelf -s %ogd% <ELF>
1168     */
1169     static void
1170     scanelf_match_symname(elfobj *elf, char *found_sym, char **ret, size_t *ret_len, const char *symname,
1171     unsigned int stt, unsigned int stb, unsigned int shn, unsigned long size)
1172     {
1173 vapier 1.248 const char *this_sym;
1174     size_t n;
1175 vapier 1.215
1176 vapier 1.248 array_for_each(find_sym_arr, n, this_sym) {
1177 vapier 1.215 bool inc_notype, inc_object, inc_func, inc_file,
1178     inc_local, inc_global, inc_weak,
1179     inc_def, inc_undef, inc_abs, inc_common;
1180    
1181     /* symbol selection! */
1182     inc_notype = inc_object = inc_func = inc_file = \
1183     inc_local = inc_global = inc_weak = \
1184     inc_def = inc_undef = inc_abs = inc_common = \
1185     (*this_sym != '%');
1186    
1187     /* parse the contents of %...% */
1188     if (!inc_notype) {
1189     while (*(this_sym++)) {
1190     if (*this_sym == '%') {
1191     ++this_sym;
1192     break;
1193     }
1194     switch (*this_sym) {
1195     case 'n': inc_notype = true; break;
1196     case 'o': inc_object = true; break;
1197     case 'f': inc_func = true; break;
1198     case 'F': inc_file = true; break;
1199     case 'l': inc_local = true; break;
1200     case 'g': inc_global = true; break;
1201     case 'w': inc_weak = true; break;
1202     case 'd': inc_def = true; break;
1203     case 'u': inc_undef = true; break;
1204     case 'a': inc_abs = true; break;
1205     case 'c': inc_common = true; break;
1206     default: err("invalid symbol selector '%c'", *this_sym);
1207     }
1208     }
1209    
1210     /* If no types are matched, not match all */
1211     if (!inc_notype && !inc_object && !inc_func && !inc_file)
1212     inc_notype = inc_object = inc_func = inc_file = true;
1213     if (!inc_local && !inc_global && !inc_weak)
1214     inc_local = inc_global = inc_weak = true;
1215     if (!inc_def && !inc_undef && !inc_abs && !inc_common)
1216     inc_def = inc_undef = inc_abs = inc_common = true;
1217    
1218     /* backwards compat for defined/undefined short hand */
1219     } else if (*this_sym == '+') {
1220     inc_undef = false;
1221     ++this_sym;
1222     } else if (*this_sym == '-') {
1223     inc_def = inc_abs = inc_common = false;
1224     ++this_sym;
1225     }
1226    
1227     /* filter symbols */
1228     if ((!inc_notype && stt == STT_NOTYPE) || \
1229     (!inc_object && stt == STT_OBJECT) || \
1230     (!inc_func && stt == STT_FUNC ) || \
1231     (!inc_file && stt == STT_FILE ) || \
1232     (!inc_local && stb == STB_LOCAL ) || \
1233     (!inc_global && stb == STB_GLOBAL) || \
1234     (!inc_weak && stb == STB_WEAK ) || \
1235     (!inc_def && shn && shn < SHN_LORESERVE) || \
1236     (!inc_undef && shn == SHN_UNDEF ) || \
1237     (!inc_abs && shn == SHN_ABS ) || \
1238     (!inc_common && shn == SHN_COMMON))
1239     continue;
1240    
1241     if (*this_sym == '*') {
1242     /* a "*" symbol gets you debug output */
1243     printf("%s(%s) %5lX %15s %15s %15s %s\n",
1244     ((*found_sym == 0) ? "\n\t" : "\t"),
1245     elf->base_filename,
1246     size,
1247     get_elfstttype(stt),
1248     get_elfstbtype(stb),
1249     get_elfshntype(shn),
1250     symname);
1251     goto matched;
1252    
1253     } else {
1254     if (g_match) {
1255     /* regex match the symbol */
1256 vapier 1.249 if (regexec(find_sym_regex_arr->eles[n], symname, 0, NULL, 0) == REG_NOMATCH)
1257 vapier 1.215 continue;
1258    
1259     } else if (*this_sym) {
1260     /* give empty symbols a "pass", else do a normal compare */
1261     const size_t len = strlen(this_sym);
1262     if (!(strncmp(this_sym, symname, len) == 0 &&
1263     /* Accept unversioned symbol names */
1264     (symname[len] == '\0' || symname[len] == '@')))
1265     continue;
1266     }
1267    
1268     if (be_semi_verbose) {
1269     char buf[1024];
1270     snprintf(buf, sizeof(buf), "%lX %s %s",
1271     size,
1272     get_elfstttype(stt),
1273     this_sym);
1274     *ret = xstrdup(buf);
1275     } else {
1276     if (*ret) xchrcat(ret, ',', ret_len);
1277     xstrcat(ret, symname, ret_len);
1278     }
1279    
1280     goto matched;
1281     }
1282 vapier 1.248 }
1283 vapier 1.215
1284     return;
1285    
1286     matched:
1287     *found_sym = 1;
1288 flameeyes 1.197 }
1289    
1290 vapier 1.225 static const char *scanelf_file_sym(elfobj *elf, char *found_sym)
1291 vapier 1.39 {
1292 vapier 1.95 char *ret;
1293 vapier 1.39 void *symtab_void, *strtab_void;
1294 vapier 1.38
1295 vapier 1.41 if (!find_sym) return NULL;
1296 vapier 1.214 ret = NULL;
1297 vapier 1.32
1298 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
1299 vapier 1.27
1300 vapier 1.39 if (symtab_void && strtab_void) {
1301 vapier 1.27 #define FIND_SYM(B) \
1302     if (elf->elf_class == ELFCLASS ## B) { \
1303     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
1304     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
1305 vapier 1.217 Elf ## B ## _Sym *sym = SYM ## B (elf->vdata + EGET(symtab->sh_offset)); \
1306 vapier 1.234 Elf ## B ## _Word i, cnt = EGET(symtab->sh_entsize); \
1307 vapier 1.27 char *symname; \
1308 vapier 1.214 size_t ret_len = 0; \
1309 vapier 1.115 if (cnt) \
1310     cnt = EGET(symtab->sh_size) / cnt; \
1311 vapier 1.27 for (i = 0; i < cnt; ++i) { \
1312 vapier 1.217 if ((void*)sym > elf->data_end) { \
1313 flameeyes 1.195 warnf("%s: corrupt ELF symbols - aborting", elf->filename); \
1314     goto break_out; \
1315     } \
1316 vapier 1.27 if (sym->st_name) { \
1317 vapier 1.134 /* make sure the symbol name is in acceptable memory range */ \
1318 vapier 1.217 symname = elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name); \
1319     if ((void*)symname > elf->data_end) { \
1320 vapier 1.115 warnf("%s: corrupt ELF symbols", elf->filename); \
1321 vapier 1.134 ++sym; \
1322 vapier 1.111 continue; \
1323     } \
1324 vapier 1.215 scanelf_match_symname(elf, found_sym, \
1325     &ret, &ret_len, symname, \
1326     ELF##B##_ST_TYPE(EGET(sym->st_info)), \
1327     ELF##B##_ST_BIND(EGET(sym->st_info)), \
1328     EGET(sym->st_shndx), \
1329     /* st_size can be 64bit, but no one is really that big, so screw em */ \
1330     EGET(sym->st_size)); \
1331 vapier 1.27 } \
1332     ++sym; \
1333 vapier 1.234 } \
1334     }
1335 vapier 1.27 FIND_SYM(32)
1336     FIND_SYM(64)
1337 vapier 1.39 }
1338 vapier 1.70
1339 vapier 1.95 break_out:
1340 solar 1.127 if (be_wewy_wewy_quiet) return NULL;
1341 vapier 1.70
1342 vapier 1.41 if (*find_sym != '*' && *found_sym)
1343 vapier 1.95 return ret;
1344 vapier 1.41 if (be_quiet)
1345     return NULL;
1346     else
1347 vapier 1.225 return " - ";
1348 vapier 1.39 }
1349 solar 1.119
1350 vapier 1.225 static const char *scanelf_file_sections(elfobj *elf, char *found_section)
1351 solar 1.124 {
1352     if (!find_section)
1353     return NULL;
1354    
1355     #define FIND_SECTION(B) \
1356     if (elf->elf_class == ELFCLASS ## B) { \
1357 vapier 1.226 size_t matched, n; \
1358 solar 1.136 int invert; \
1359 vapier 1.226 const char *section_name; \
1360 solar 1.124 Elf ## B ## _Shdr *section; \
1361 vapier 1.226 \
1362     matched = 0; \
1363     array_for_each(find_section_arr, n, section_name) { \
1364     invert = (*section_name == '!' ? 1 : 0); \
1365     section = SHDR ## B (elf_findsecbyname(elf, section_name + invert)); \
1366     if ((section == NULL && invert) || (section != NULL && !invert)) \
1367     ++matched; \
1368     } \
1369     \
1370     if (matched == array_cnt(find_section_arr)) \
1371 solar 1.124 *found_section = 1; \
1372     }
1373     FIND_SECTION(32)
1374     FIND_SECTION(64)
1375    
1376 vapier 1.138 if (be_wewy_wewy_quiet)
1377     return NULL;
1378 solar 1.124
1379     if (*found_section)
1380     return find_section;
1381    
1382     if (be_quiet)
1383     return NULL;
1384     else
1385 vapier 1.225 return " - ";
1386 solar 1.124 }
1387    
1388 vapier 1.39 /* scan an elf file and show all the fun stuff */
1389 vapier 1.210 #define prints(str) ({ ssize_t ret = write(fileno(stdout), str, strlen(str)); ret; })
1390 vapier 1.106 static int scanelf_elfobj(elfobj *elf)
1391 vapier 1.39 {
1392 vapier 1.44 unsigned long i;
1393 vapier 1.162 char found_pax, found_phdr, found_relro, found_load, found_textrel,
1394     found_rpath, found_needed, found_interp, found_bind, found_soname,
1395 solar 1.124 found_sym, found_lib, found_file, found_textrels, found_section;
1396 vapier 1.41 static char *out_buffer = NULL;
1397     static size_t out_len;
1398 vapier 1.39
1399 vapier 1.76 found_pax = found_phdr = found_relro = found_load = found_textrel = \
1400 vapier 1.84 found_rpath = found_needed = found_interp = found_bind = found_soname = \
1401 solar 1.124 found_sym = found_lib = found_file = found_textrels = found_section = 0;
1402 vapier 1.39
1403 vapier 1.114 if (be_verbose > 2)
1404 vapier 1.106 printf("%s: scanning file {%s,%s}\n", elf->filename,
1405 vapier 1.69 get_elfeitype(EI_CLASS, elf->elf_class),
1406     get_elfeitype(EI_DATA, elf->data[EI_DATA]));
1407 vapier 1.114 else if (be_verbose > 1)
1408 vapier 1.106 printf("%s: scanning file\n", elf->filename);
1409 vapier 1.39
1410 vapier 1.41 /* init output buffer */
1411     if (!out_buffer) {
1412     out_len = sizeof(char) * 80;
1413 vapier 1.186 out_buffer = xmalloc(out_len);
1414 vapier 1.41 }
1415     *out_buffer = '\0';
1416    
1417 vapier 1.39 /* show the header */
1418     if (!be_quiet && show_banner) {
1419 vapier 1.49 for (i = 0; out_format[i]; ++i) {
1420 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
1421 vapier 1.41
1422     switch (out_format[++i]) {
1423 solar 1.132 case '+': break;
1424 vapier 1.41 case '%': break;
1425 vapier 1.70 case '#': break;
1426 vapier 1.66 case 'F':
1427     case 'p':
1428     case 'f': prints("FILE "); found_file = 1; break;
1429 vapier 1.41 case 'o': prints(" TYPE "); break;
1430     case 'x': prints(" PAX "); break;
1431 vapier 1.71 case 'e': prints("STK/REL/PTL "); break;
1432 vapier 1.41 case 't': prints("TEXTREL "); break;
1433     case 'r': prints("RPATH "); break;
1434 vapier 1.171 case 'M': prints("CLASS "); break;
1435 vapier 1.240 case 'l':
1436 vapier 1.41 case 'n': prints("NEEDED "); break;
1437     case 'i': prints("INTERP "); break;
1438 vapier 1.49 case 'b': prints("BIND "); break;
1439 solar 1.190 case 'Z': prints("SIZE "); break;
1440 vapier 1.84 case 'S': prints("SONAME "); break;
1441 vapier 1.41 case 's': prints("SYM "); break;
1442 vapier 1.72 case 'N': prints("LIB "); break;
1443 vapier 1.76 case 'T': prints("TEXTRELS "); break;
1444 vapier 1.126 case 'k': prints("SECTION "); break;
1445 vapier 1.166 case 'a': prints("ARCH "); break;
1446 solar 1.191 case 'I': prints("OSABI "); break;
1447     case 'Y': prints("EABI "); break;
1448 solar 1.180 case 'O': prints("PERM "); break;
1449 solar 1.181 case 'D': prints("ENDIAN "); break;
1450 vapier 1.76 default: warnf("'%c' has no title ?", out_format[i]);
1451 vapier 1.39 }
1452 vapier 1.27 }
1453 vapier 1.49 if (!found_file) prints("FILE ");
1454 vapier 1.41 prints("\n");
1455 vapier 1.49 found_file = 0;
1456 vapier 1.39 show_banner = 0;
1457     }
1458    
1459     /* dump all the good stuff */
1460 vapier 1.49 for (i = 0; out_format[i]; ++i) {
1461 vapier 1.41 const char *out;
1462 vapier 1.66 const char *tmp;
1463 solar 1.190 static char ubuf[sizeof(unsigned long)*2];
1464 vapier 1.70 if (!IS_MODIFIER(out_format[i])) {
1465 vapier 1.41 xchrcat(&out_buffer, out_format[i], &out_len);
1466     continue;
1467     }
1468 vapier 1.39
1469 vapier 1.41 out = NULL;
1470 solar 1.127 be_wewy_wewy_quiet = (out_format[i] == '#');
1471 solar 1.132 be_semi_verbose = (out_format[i] == '+');
1472 vapier 1.41 switch (out_format[++i]) {
1473 solar 1.132 case '+':
1474 vapier 1.70 case '%':
1475     case '#':
1476     xchrcat(&out_buffer, out_format[i], &out_len); break;
1477     case 'F':
1478 vapier 1.76 found_file = 1;
1479 solar 1.127 if (be_wewy_wewy_quiet) break;
1480 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
1481 vapier 1.70 break;
1482 vapier 1.66 case 'p':
1483 vapier 1.76 found_file = 1;
1484 solar 1.127 if (be_wewy_wewy_quiet) break;
1485 vapier 1.106 tmp = elf->filename;
1486 vapier 1.66 if (search_path) {
1487     ssize_t len_search = strlen(search_path);
1488 vapier 1.106 ssize_t len_file = strlen(elf->filename);
1489     if (!strncmp(elf->filename, search_path, len_search) && \
1490 vapier 1.66 len_file > len_search)
1491     tmp += len_search;
1492     if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
1493     }
1494     xstrcat(&out_buffer, tmp, &out_len);
1495     break;
1496     case 'f':
1497 vapier 1.76 found_file = 1;
1498 solar 1.127 if (be_wewy_wewy_quiet) break;
1499 vapier 1.106 tmp = strrchr(elf->filename, '/');
1500     tmp = (tmp == NULL ? elf->filename : tmp+1);
1501 vapier 1.66 xstrcat(&out_buffer, tmp, &out_len);
1502     break;
1503 vapier 1.41 case 'o': out = get_elfetype(elf); break;
1504     case 'x': out = scanelf_file_pax(elf, &found_pax); break;
1505 solar 1.73 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
1506 vapier 1.41 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
1507 vapier 1.79 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
1508 vapier 1.41 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
1509 vapier 1.171 case 'M': out = get_elfeitype(EI_CLASS, elf->data[EI_CLASS]); break;
1510 solar 1.181 case 'D': out = get_endian(elf); break;
1511 vapier 1.206 case 'O': out = strfileperms(elf->filename); break;
1512 vapier 1.72 case 'n':
1513     case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
1514 vapier 1.41 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
1515 vapier 1.49 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
1516 vapier 1.84 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
1517 vapier 1.72 case 's': out = scanelf_file_sym(elf, &found_sym); break;
1518 solar 1.124 case 'k': out = scanelf_file_sections(elf, &found_section); break;
1519 vapier 1.166 case 'a': out = get_elfemtype(elf); break;
1520 solar 1.191 case 'I': out = get_elfosabi(elf); break;
1521     case 'Y': out = get_elf_eabi(elf); break;
1522 vapier 1.193 case 'Z': snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)elf->len); out = ubuf; break;;
1523 vapier 1.76 default: warnf("'%c' has no scan code?", out_format[i]);
1524 vapier 1.29 }
1525 vapier 1.214 if (out)
1526     xstrcat(&out_buffer, out, &out_len);
1527 vapier 1.39 }
1528    
1529 vapier 1.54 #define FOUND_SOMETHING() \
1530 solar 1.73 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
1531 vapier 1.76 found_rpath || found_needed || found_interp || found_bind || \
1532 solar 1.124 found_soname || found_sym || found_lib || found_textrels || found_section )
1533 vapier 1.54
1534     if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1535     xchrcat(&out_buffer, ' ', &out_len);
1536 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
1537 vapier 1.27 }
1538 vapier 1.79 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1539 vapier 1.41 puts(out_buffer);
1540 vapier 1.79 fflush(stdout);
1541     }
1542 vapier 1.10
1543 vapier 1.105 return 0;
1544     }
1545    
1546 vapier 1.106 /* scan a single elf */
1547     static int scanelf_elf(const char *filename, int fd, size_t len)
1548     {
1549 solar 1.120 int ret = 1;
1550 vapier 1.106 elfobj *elf;
1551    
1552     /* verify this is real ELF */
1553     if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1554     if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1555 vapier 1.235 return 2;
1556 solar 1.120 }
1557     switch (match_bits) {
1558     case 32:
1559     if (elf->elf_class != ELFCLASS32)
1560     goto label_done;
1561     break;
1562     case 64:
1563     if (elf->elf_class != ELFCLASS64)
1564     goto label_done;
1565     break;
1566     default: break;
1567 vapier 1.106 }
1568 vapier 1.228 if (match_etypes) {
1569 solar 1.119 char sbuf[126];
1570     strncpy(sbuf, match_etypes, sizeof(sbuf));
1571     if (strchr(match_etypes, ',') != NULL) {
1572     char *p;
1573 vapier 1.186 while ((p = strrchr(sbuf, ',')) != NULL) {
1574 solar 1.119 *p = 0;
1575 solar 1.129 if (etype_lookup(p+1) == get_etype(elf))
1576 solar 1.119 goto label_ret;
1577     }
1578     }
1579 solar 1.129 if (etype_lookup(sbuf) != get_etype(elf))
1580 solar 1.119 goto label_done;
1581     }
1582    
1583     label_ret:
1584 vapier 1.106 ret = scanelf_elfobj(elf);
1585 solar 1.119
1586     label_done:
1587 vapier 1.106 unreadelf(elf);
1588     return ret;
1589     }
1590 solar 1.119
1591 vapier 1.105 /* scan an archive of elfs */
1592 vapier 1.106 static int scanelf_archive(const char *filename, int fd, size_t len)
1593 vapier 1.105 {
1594 vapier 1.106 archive_handle *ar;
1595 vapier 1.105 archive_member *m;
1596 vapier 1.106 char *ar_buffer;
1597     elfobj *elf;
1598    
1599     ar = ar_open_fd(filename, fd);
1600     if (ar == NULL)
1601     return 1;
1602    
1603 vapier 1.201 ar_buffer = mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1604 vapier 1.218 while ((m = ar_next(ar)) != NULL) {
1605     off_t cur_pos = lseek(fd, 0, SEEK_CUR);
1606     if (cur_pos == -1)
1607     errp("lseek() failed");
1608     elf = readelf_buffer(m->name, ar_buffer + cur_pos, m->size);
1609 vapier 1.106 if (elf) {
1610     scanelf_elfobj(elf);
1611     unreadelf(elf);
1612     }
1613     }
1614     munmap(ar_buffer, len);
1615    
1616 vapier 1.105 return 0;
1617     }
1618     /* scan a file which may be an elf or an archive or some other magical beast */
1619 vapier 1.232 static int scanelf_fileat(int dir_fd, const char *filename, const struct stat *st_cache)
1620 vapier 1.105 {
1621 vapier 1.161 const struct stat *st = st_cache;
1622     struct stat symlink_st;
1623 vapier 1.106 int fd;
1624 vapier 1.105
1625     /* always handle regular files and handle symlinked files if no -y */
1626 vapier 1.161 if (S_ISLNK(st->st_mode)) {
1627 vapier 1.232 if (!scan_symlink)
1628     return 1;
1629     fstatat(dir_fd, filename, &symlink_st, 0);
1630 vapier 1.161 st = &symlink_st;
1631 vapier 1.105 }
1632 vapier 1.161
1633     if (!S_ISREG(st->st_mode)) {
1634 vapier 1.105 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1635 solar 1.164 return 1;
1636 vapier 1.105 }
1637    
1638 solar 1.180 if (match_perms) {
1639     if ((st->st_mode | match_perms) != st->st_mode)
1640     return 1;
1641     }
1642 vapier 1.232 fd = openat(dir_fd, filename, (fix_elf ? O_RDWR : O_RDONLY) | O_CLOEXEC);
1643 vapier 1.245 if (fd == -1) {
1644     if (fix_elf && errno == ETXTBSY)
1645     warnp("%s: could not fix", filename);
1646     else if (be_verbose > 2)
1647     printf("%s: skipping file: %s\n", filename, strerror(errno));
1648 solar 1.164 return 1;
1649 vapier 1.245 }
1650 vapier 1.106
1651 vapier 1.235 if (scanelf_elf(filename, fd, st->st_size) == 2) {
1652 vapier 1.105 /* if it isn't an ELF, maybe it's an .a archive */
1653 vapier 1.235 if (scan_archives)
1654     scanelf_archive(filename, fd, st->st_size);
1655    
1656     /*
1657     * unreadelf() implicitly closes its fd, so only close it
1658     * when we are returning it in the non-ELF case
1659     */
1660     close(fd);
1661     }
1662 vapier 1.106
1663 solar 1.164 return 0;
1664 solar 1.6 }
1665    
1666 solar 1.1 /* scan a directory for ET_EXEC files and print when we find one */
1667 vapier 1.232 static int scanelf_dirat(int dir_fd, const char *path)
1668 solar 1.1 {
1669 vapier 1.10 register DIR *dir;
1670     register struct dirent *dentry;
1671 vapier 1.14 struct stat st_top, st;
1672 vapier 1.232 char buf[__PAX_UTILS_PATH_MAX], *subpath;
1673 vapier 1.32 size_t pathlen = 0, len = 0;
1674 solar 1.164 int ret = 0;
1675 vapier 1.232 int subdir_fd;
1676 solar 1.223
1677 vapier 1.10 /* make sure path exists */
1678 vapier 1.232 if (fstatat(dir_fd, path, &st_top, AT_SYMLINK_NOFOLLOW) == -1) {
1679 vapier 1.39 if (be_verbose > 2) printf("%s: does not exist\n", path);
1680 solar 1.164 return 1;
1681 vapier 1.39 }
1682 solar 1.11
1683 vapier 1.10 /* ok, if it isn't a directory, assume we can open it */
1684 vapier 1.232 if (!S_ISDIR(st_top.st_mode))
1685     return scanelf_fileat(dir_fd, path, &st_top);
1686 vapier 1.10
1687     /* now scan the dir looking for fun stuff */
1688 vapier 1.232 subdir_fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
1689     if (subdir_fd == -1)
1690     dir = NULL;
1691     else
1692     dir = fdopendir(subdir_fd);
1693     if (dir == NULL) {
1694     if (subdir_fd != -1)
1695     close(subdir_fd);
1696 vapier 1.237 warnfp("could not opendir(%s)", path);
1697 solar 1.164 return 1;
1698 vapier 1.10 }
1699 vapier 1.114 if (be_verbose > 1) printf("%s: scanning dir\n", path);
1700 solar 1.11
1701 vapier 1.232 subpath = stpcpy(buf, path);
1702 vapier 1.243 if (subpath[-1] != '/')
1703     *subpath++ = '/';
1704 vapier 1.232 pathlen = subpath - buf;
1705 vapier 1.10 while ((dentry = readdir(dir))) {
1706     if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1707     continue;
1708 vapier 1.232
1709     if (fstatat(subdir_fd, dentry->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
1710     continue;
1711    
1712     len = strlen(dentry->d_name);
1713     if (len + pathlen + 1 >= sizeof(buf)) {
1714     warnf("Skipping '%s%s': len > sizeof(buf); %zu > %zu\n",
1715     path, dentry->d_name, len + pathlen + 1, sizeof(buf));
1716 vapier 1.32 continue;
1717     }
1718 vapier 1.232 memcpy(subpath, dentry->d_name, len);
1719     subpath[len] = '\0';
1720    
1721     if (S_ISREG(st.st_mode))
1722     ret = scanelf_fileat(dir_fd, buf, &st);
1723     else if (dir_recurse && S_ISDIR(st.st_mode)) {
1724     if (dir_crossmount || (st_top.st_dev == st.st_dev))
1725     ret = scanelf_dirat(dir_fd, buf);
1726 vapier 1.10 }
1727     }
1728     closedir(dir);
1729 vapier 1.232
1730 solar 1.164 return ret;
1731 solar 1.1 }
1732 vapier 1.232 static int scanelf_dir(const char *path)
1733     {
1734     return scanelf_dirat(root_fd, root_rel_path(path));
1735     }
1736 solar 1.1
1737 vapier 1.133 static int scanelf_from_file(const char *filename)
1738 vapier 1.47 {
1739 vapier 1.230 FILE *fp;
1740     char *p, *path;
1741     size_t len;
1742     int ret;
1743 solar 1.45
1744 solar 1.132 if (strcmp(filename, "-") == 0)
1745 solar 1.45 fp = stdin;
1746     else if ((fp = fopen(filename, "r")) == NULL)
1747     return 1;
1748    
1749 vapier 1.230 path = NULL;
1750     len = 0;
1751     ret = 0;
1752     while (getline(&path, &len, fp) != -1) {
1753 solar 1.45 if ((p = strchr(path, '\n')) != NULL)
1754     *p = 0;
1755 vapier 1.66 search_path = path;
1756 solar 1.164 ret = scanelf_dir(path);
1757 solar 1.45 }
1758 vapier 1.230 free(path);
1759    
1760 solar 1.45 if (fp != stdin)
1761     fclose(fp);
1762 vapier 1.230
1763 solar 1.164 return ret;
1764 solar 1.45 }
1765    
1766 solar 1.154 #if defined(__GLIBC__) || defined(__UCLIBC__) || defined(__NetBSD__)
1767 vapier 1.148
1768 vapier 1.240 static int _load_ld_cache_config(const char *fname)
1769 vapier 1.48 {
1770     FILE *fp = NULL;
1771 vapier 1.230 char *p, *path;
1772     size_t len;
1773 vapier 1.232 int curr_fd = -1;
1774 solar 1.223
1775 vapier 1.232 fp = fopenat_r(root_fd, root_rel_path(fname));
1776     if (fp == NULL)
1777 vapier 1.240 return -1;
1778 vapier 1.48
1779 vapier 1.230 path = NULL;
1780     len = 0;
1781     while (getline(&path, &len, fp) != -1) {
1782 vapier 1.48 if ((p = strrchr(path, '\r')) != NULL)
1783     *p = 0;
1784     if ((p = strchr(path, '\n')) != NULL)
1785     *p = 0;
1786 vapier 1.219
1787 vapier 1.186 /* recursive includes of the same file will make this segfault. */
1788 solar 1.129 if ((memcmp(path, "include", 7) == 0) && isblank(path[7])) {
1789 vapier 1.219 glob_t gl;
1790 solar 1.123 size_t x;
1791 vapier 1.232 const char *gpath;
1792 solar 1.123
1793 vapier 1.232 /* re-use existing path buffer ... need to be creative */
1794 solar 1.123 if (path[8] != '/')
1795 vapier 1.232 gpath = memcpy(path + 3, "/etc/", 5);
1796 solar 1.123 else
1797 vapier 1.232 gpath = path + 8;
1798     if (root_fd != AT_FDCWD) {
1799     if (curr_fd == -1) {
1800     curr_fd = open(".", O_RDONLY|O_CLOEXEC);
1801     if (fchdir(root_fd))
1802     errp("unable to change to root dir");
1803     }
1804     gpath = root_rel_path(gpath);
1805     }
1806 solar 1.123
1807 vapier 1.219 if (glob(gpath, 0, NULL, &gl) == 0) {
1808 solar 1.123 for (x = 0; x < gl.gl_pathc; ++x) {
1809     /* try to avoid direct loops */
1810     if (strcmp(gl.gl_pathv[x], fname) == 0)
1811     continue;
1812 vapier 1.240 _load_ld_cache_config(gl.gl_pathv[x]);
1813 solar 1.123 }
1814 vapier 1.219 globfree(&gl);
1815 solar 1.160 }
1816 vapier 1.232
1817     /* failed globs are ignored by glibc */
1818     continue;
1819 solar 1.123 }
1820 vapier 1.219
1821 solar 1.123 if (*path != '/')
1822     continue;
1823 vapier 1.48
1824 vapier 1.233 xarraypush_str(ldpaths, path);
1825 vapier 1.48 }
1826 vapier 1.230 free(path);
1827 vapier 1.48
1828     fclose(fp);
1829 vapier 1.230
1830 vapier 1.232 if (curr_fd != -1) {
1831     if (fchdir(curr_fd))
1832     /* don't care */;
1833     close(curr_fd);
1834     }
1835    
1836 vapier 1.240 return 0;
1837 vapier 1.48 }
1838 flameeyes 1.141
1839 vapier 1.211 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1840 vapier 1.148
1841 vapier 1.240 static int _load_ld_cache_config(const char *fname)
1842 flameeyes 1.141 {
1843     FILE *fp = NULL;
1844     char *b = NULL, *p;
1845     struct elfhints_hdr hdr;
1846 vapier 1.152
1847 vapier 1.232 fp = fopenat_r(root_fd, root_rel_path(fname));
1848     if (fp == NULL)
1849 vapier 1.240 return -1;
1850 flameeyes 1.141
1851 vapier 1.152 if (fread(&hdr, 1, sizeof(hdr), fp) != sizeof(hdr) ||
1852     hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 ||
1853     fseek(fp, hdr.strtab + hdr.dirlist, SEEK_SET) == -1)
1854     {
1855 flameeyes 1.141 fclose(fp);
1856 vapier 1.240 return -1;
1857 flameeyes 1.141 }
1858 vapier 1.152
1859 vapier 1.186 b = xmalloc(hdr.dirlistlen + 1);
1860 vapier 1.152 if (fread(b, 1, hdr.dirlistlen+1, fp) != hdr.dirlistlen+1) {
1861 flameeyes 1.141 fclose(fp);
1862     free(b);
1863 vapier 1.240 return -1;
1864 flameeyes 1.141 }
1865 vapier 1.152
1866     while ((p = strsep(&b, ":"))) {
1867 vapier 1.227 if (*p == '\0')
1868     continue;
1869 vapier 1.233 xarraypush_str(ldpaths, p);
1870 flameeyes 1.141 }
1871 vapier 1.157
1872 flameeyes 1.141 free(b);
1873     fclose(fp);
1874 vapier 1.240 return 0;
1875 flameeyes 1.141 }
1876 vapier 1.148
1877     #else
1878 vapier 1.192 #ifdef __ELF__
1879 vapier 1.148 #warning Cache config support not implemented for your target
1880 vapier 1.192 #endif
1881 vapier 1.240 static int _load_ld_cache_config(const char *fname)
1882 vapier 1.148 {
1883 vapier 1.192 return 0;
1884 vapier 1.148 }
1885 flameeyes 1.141 #endif
1886 vapier 1.48
1887 vapier 1.240 static void load_ld_cache_config(const char *fname)
1888     {
1889     bool scan_l, scan_ul, scan_ull;
1890     size_t n;
1891     const char *ldpath;
1892    
1893     _load_ld_cache_config(fname);
1894    
1895     scan_l = scan_ul = scan_ull = false;
1896     if (array_cnt(ldpaths)) {
1897     array_for_each(ldpaths, n, ldpath) {
1898     if (!scan_l && !strcmp(ldpath, "/lib")) scan_l = true;
1899     if (!scan_ul && !strcmp(ldpath, "/usr/lib")) scan_ul = true;
1900     if (!scan_ull && !strcmp(ldpath, "/usr/local/lib")) scan_ull = true;
1901     }
1902     }
1903    
1904     if (!scan_l) xarraypush_str(ldpaths, "/lib");
1905     if (!scan_ul) xarraypush_str(ldpaths, "/usr/lib");
1906     if (!scan_ull) xarraypush_str(ldpaths, "/usr/local/lib");
1907     }
1908    
1909 vapier 1.10 /* scan /etc/ld.so.conf for paths */
1910 vapier 1.184 static void scanelf_ldpath(void)
1911 vapier 1.10 {
1912 vapier 1.227 size_t n;
1913     const char *ldpath;
1914 vapier 1.17
1915 vapier 1.240 array_for_each(ldpaths, n, ldpath)
1916 vapier 1.227 scanelf_dir(ldpath);
1917 vapier 1.10 }
1918 solar 1.1
1919 vapier 1.10 /* scan env PATH for paths */
1920 vapier 1.184 static void scanelf_envpath(void)
1921 solar 1.1 {
1922 solar 1.34 char *path, *p;
1923 vapier 1.10
1924     path = getenv("PATH");
1925     if (!path)
1926     err("PATH is not set in your env !");
1927 vapier 1.41 path = xstrdup(path);
1928 vapier 1.10
1929     while ((p = strrchr(path, ':')) != NULL) {
1930     scanelf_dir(p + 1);
1931     *p = 0;
1932     }
1933 vapier 1.17
1934 solar 1.34 free(path);
1935 solar 1.1 }
1936    
1937 vapier 1.221 /* usage / invocation handling functions */ /* Free Flags: c d j u w G H J K P Q U W */
1938     #define PARSE_FLAGS "plRmyAXz:xetrnLibSs:k:gN:TaqvF:f:o:E:M:DIYO:ZCBhV"
1939 vapier 1.27 #define a_argument required_argument
1940 vapier 1.10 static struct option const long_opts[] = {
1941     {"path", no_argument, NULL, 'p'},
1942     {"ldpath", no_argument, NULL, 'l'},
1943 vapier 1.240 {"use-ldpath",no_argument, NULL, 129},
1944 solar 1.223 {"root", a_argument, NULL, 128},
1945 vapier 1.10 {"recursive", no_argument, NULL, 'R'},
1946 vapier 1.14 {"mount", no_argument, NULL, 'm'},
1947 vapier 1.37 {"symlink", no_argument, NULL, 'y'},
1948 vapier 1.105 {"archives", no_argument, NULL, 'A'},
1949     {"ldcache", no_argument, NULL, 'L'},
1950 vapier 1.101 {"fix", no_argument, NULL, 'X'},
1951 solar 1.127 {"setpax", a_argument, NULL, 'z'},
1952 vapier 1.10 {"pax", no_argument, NULL, 'x'},
1953 solar 1.16 {"header", no_argument, NULL, 'e'},
1954 vapier 1.10 {"textrel", no_argument, NULL, 't'},
1955     {"rpath", no_argument, NULL, 'r'},
1956 vapier 1.32 {"needed", no_argument, NULL, 'n'},
1957 vapier 1.38 {"interp", no_argument, NULL, 'i'},
1958 vapier 1.49 {"bind", no_argument, NULL, 'b'},
1959 vapier 1.84 {"soname", no_argument, NULL, 'S'},
1960 vapier 1.76 {"symbol", a_argument, NULL, 's'},
1961 solar 1.124 {"section", a_argument, NULL, 'k'},
1962 vapier 1.76 {"lib", a_argument, NULL, 'N'},
1963 solar 1.86 {"gmatch", no_argument, NULL, 'g'},
1964 vapier 1.76 {"textrels", no_argument, NULL, 'T'},
1965 solar 1.119 {"etype", a_argument, NULL, 'E'},
1966 solar 1.120 {"bits", a_argument, NULL, 'M'},
1967 solar 1.181 {"endian", no_argument, NULL, 'D'},
1968 solar 1.191 {"osabi", no_argument, NULL, 'I'},
1969     {"eabi", no_argument, NULL, 'Y'},
1970 solar 1.180 {"perms", a_argument, NULL, 'O'},
1971 solar 1.190 {"size", no_argument, NULL, 'Z'},
1972 vapier 1.10 {"all", no_argument, NULL, 'a'},
1973     {"quiet", no_argument, NULL, 'q'},
1974 vapier 1.14 {"verbose", no_argument, NULL, 'v'},
1975 vapier 1.76 {"format", a_argument, NULL, 'F'},
1976     {"from", a_argument, NULL, 'f'},
1977     {"file", a_argument, NULL, 'o'},
1978 vapier 1.221 {"nocolor", no_argument, NULL, 'C'},
1979 solar 1.16 {"nobanner", no_argument, NULL, 'B'},
1980 vapier 1.10 {"help", no_argument, NULL, 'h'},
1981     {"version", no_argument, NULL, 'V'},
1982     {NULL, no_argument, NULL, 0x0}
1983     };
1984 solar 1.57
1985 vapier 1.222 static const char * const opts_help[] = {
1986 vapier 1.10 "Scan all directories in PATH environment",
1987     "Scan all directories in /etc/ld.so.conf",
1988 vapier 1.240 "Use ld.so.conf to show full path (use with -r/-n)",
1989 solar 1.223 "Root directory (use with -l or -p)",
1990 vapier 1.14 "Scan directories recursively",
1991 vapier 1.37 "Don't recursively cross mount points",
1992 vapier 1.101 "Don't scan symlinks",
1993 vapier 1.105 "Scan archives (.a files)",
1994 vapier 1.239 "Utilize ld.so.cache to show full path (use with -r/-n)",
1995 solar 1.127 "Try and 'fix' bad things (use with -r/-e)",
1996     "Sets EI_PAX/PT_PAX_FLAGS to <arg> (use with -Xx)\n",
1997 vapier 1.10 "Print PaX markings",
1998 vapier 1.71 "Print GNU_STACK/PT_LOAD markings",
1999 vapier 1.10 "Print TEXTREL information",
2000     "Print RPATH information",
2001 vapier 1.32 "Print NEEDED information",
2002 vapier 1.38 "Print INTERP information",
2003 vapier 1.49 "Print BIND information",
2004 vapier 1.84 "Print SONAME information",
2005 vapier 1.27 "Find a specified symbol",
2006 solar 1.124 "Find a specified section",
2007 vapier 1.72 "Find a specified library",
2008 vapier 1.246 "Use regex rather than string compare (with -s); specify twice for case insensitive",
2009 vapier 1.76 "Locate cause of TEXTREL",
2010 solar 1.129 "Print only ELF files matching etype ET_DYN,ET_EXEC ...",
2011 solar 1.120 "Print only ELF files matching numeric bits",
2012 solar 1.181 "Print Endianness",
2013 solar 1.191 "Print OSABI",
2014     "Print EABI (EM_ARM Only)",
2015 solar 1.180 "Print only ELF files matching octal permissions",
2016 solar 1.190 "Print ELF file size",
2017 vapier 1.216 "Print all useful/simple info\n",
2018 vapier 1.14 "Only output 'bad' things",
2019     "Be verbose (can be specified more than once)",
2020 vapier 1.39 "Use specified format for output",
2021 solar 1.45 "Read input stream from a filename",
2022 vapier 1.24 "Write output stream to a filename",
2023 vapier 1.221 "Don't emit color in output",
2024 vapier 1.14 "Don't display the header",
2025 vapier 1.10 "Print this help and exit",
2026     "Print version and exit",
2027     NULL
2028     };
2029    
2030     /* display usage and exit */
2031     static void usage(int status)
2032 solar 1.1 {
2033 vapier 1.44 unsigned long i;
2034 solar 1.52 printf("* Scan ELF binaries for stuff\n\n"
2035 vapier 1.105 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
2036 solar 1.35 printf("Options: -[%s]\n", PARSE_FLAGS);
2037 vapier 1.241 for (i = 0; long_opts[i].name; ++i) {
2038     /* first output the short flag if it has one */
2039     if (long_opts[i].val > '~')
2040     printf(" ");
2041     else
2042     printf(" -%c, ", long_opts[i].val);
2043    
2044     /* then the long flag */
2045 vapier 1.27 if (long_opts[i].has_arg == no_argument)
2046 vapier 1.241 printf("--%-14s", long_opts[i].name);
2047 vapier 1.27 else
2048 vapier 1.241 printf("--%-7s <arg> ", long_opts[i].name);
2049    
2050     /* finally the help text */
2051     printf("* %s\n", opts_help[i]);
2052     }
2053 solar 1.45
2054 vapier 1.173 puts("\nFor more information, see the scanelf(1) manpage");
2055 vapier 1.10 exit(status);
2056 solar 1.1 }
2057    
2058     /* parse command line arguments and preform needed actions */
2059 vapier 1.165 #define do_pax_state(option, flag) \
2060     if (islower(option)) { \
2061     flags &= ~PF_##flag; \
2062     flags |= PF_NO##flag; \
2063     } else { \
2064     flags &= ~PF_NO##flag; \
2065     flags |= PF_##flag; \
2066     }
2067 solar 1.164 static int parseargs(int argc, char *argv[])
2068 vapier 1.10 {
2069 vapier 1.48 int i;
2070 vapier 1.133 const char *from_file = NULL;
2071 solar 1.164 int ret = 0;
2072 vapier 1.240 char load_cache_config = 0;
2073 vapier 1.10
2074     opterr = 0;
2075 vapier 1.48 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
2076     switch (i) {
2077 vapier 1.10
2078 vapier 1.39 case 'V':
2079 vapier 1.80 printf("pax-utils-%s: %s compiled %s\n%s\n"
2080     "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
2081     VERSION, __FILE__, __DATE__, rcsid, argv0);
2082 vapier 1.10 exit(EXIT_SUCCESS);
2083     break;
2084     case 'h': usage(EXIT_SUCCESS); break;
2085 solar 1.45 case 'f':
2086 vapier 1.100 if (from_file) warn("You prob don't want to specify -f twice");
2087     from_file = optarg;
2088 solar 1.45 break;
2089 solar 1.119 case 'E':
2090 vapier 1.228 match_etypes = optarg;
2091 solar 1.119 break;
2092 solar 1.120 case 'M':
2093     match_bits = atoi(optarg);
2094 solar 1.182 if (match_bits == 0) {
2095     if (strcmp(optarg, "ELFCLASS32") == 0)
2096     match_bits = 32;
2097     if (strcmp(optarg, "ELFCLASS64") == 0)
2098     match_bits = 64;
2099     }
2100 solar 1.120 break;
2101 solar 1.180 case 'O':
2102 vapier 1.205 if (sscanf(optarg, "%o", &match_perms) == -1)
2103 solar 1.180 match_bits = 0;
2104     break;
2105 vapier 1.24 case 'o': {
2106 vapier 1.146 if (freopen(optarg, "w", stdout) == NULL)
2107 vapier 1.237 errp("Could not freopen(%s)", optarg);
2108 solar 1.21 break;
2109     }
2110 solar 1.124 case 'k':
2111 vapier 1.233 xarraypush_str(find_section_arr, optarg);
2112 solar 1.124 break;
2113 vapier 1.39 case 's': {
2114 vapier 1.248 /* historically, this was comma delimited */
2115     char *this_sym = strtok(optarg, ",");
2116 vapier 1.249 if (!this_sym) /* edge case: -s '' */
2117     xarraypush_str(find_sym_arr, "");
2118 vapier 1.248 while (this_sym) {
2119     xarraypush_str(find_sym_arr, this_sym);
2120     this_sym = strtok(NULL, ",");
2121     }
2122 vapier 1.39 break;
2123     }
2124 vapier 1.226 case 'N':
2125 vapier 1.233 xarraypush_str(find_lib_arr, optarg);
2126 vapier 1.72 break;
2127 vapier 1.39 case 'F': {
2128 vapier 1.93 if (out_format) warn("You prob don't want to specify -F twice");
2129     out_format = optarg;
2130 vapier 1.39 break;
2131     }
2132 solar 1.127 case 'z': {
2133 solar 1.129 unsigned long flags = (PF_NOEMUTRAMP | PF_NORANDEXEC);
2134 solar 1.127 size_t x;
2135 vapier 1.27
2136 vapier 1.186 for (x = 0; x < strlen(optarg); x++) {
2137     switch (optarg[x]) {
2138 solar 1.127 case 'p':
2139     case 'P':
2140 vapier 1.165 do_pax_state(optarg[x], PAGEEXEC);
2141 solar 1.127 break;
2142     case 's':
2143     case 'S':
2144 vapier 1.165 do_pax_state(optarg[x], SEGMEXEC);
2145 solar 1.127 break;
2146     case 'm':
2147     case 'M':
2148 vapier 1.165 do_pax_state(optarg[x], MPROTECT);
2149 solar 1.127 break;
2150     case 'e':
2151     case 'E':
2152 vapier 1.165 do_pax_state(optarg[x], EMUTRAMP);
2153 solar 1.127 break;
2154     case 'r':
2155     case 'R':
2156 vapier 1.165 do_pax_state(optarg[x], RANDMMAP);
2157 solar 1.127 break;
2158     case 'x':
2159     case 'X':
2160 vapier 1.165 do_pax_state(optarg[x], RANDEXEC);
2161 solar 1.127 break;
2162     default:
2163     break;
2164     }
2165     }
2166     if (!(((flags & PF_PAGEEXEC) && (flags & PF_NOPAGEEXEC)) ||
2167     ((flags & PF_SEGMEXEC) && (flags & PF_NOSEGMEXEC)) ||
2168     ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP)) ||
2169     ((flags & PF_RANDEXEC) && (flags & PF_NORANDEXEC)) ||
2170     ((flags & PF_EMUTRAMP) && (flags & PF_NOEMUTRAMP)) ||
2171     ((flags & PF_RANDMMAP) && (flags & PF_NORANDMMAP))))
2172     setpax = flags;
2173     break;
2174     }
2175 solar 1.190 case 'Z': show_size = 1; break;
2176 vapier 1.246 case 'g': ++g_match; break;
2177 vapier 1.240 case 'L': load_cache_config = use_ldcache = 1; break;
2178 vapier 1.37 case 'y': scan_symlink = 0; break;
2179 vapier 1.105 case 'A': scan_archives = 1; break;
2180 vapier 1.221 case 'C': color_init(true); break;
2181 solar 1.16 case 'B': show_banner = 0; break;
2182 vapier 1.240 case 'l': load_cache_config = scan_ldpath = 1; break;
2183 vapier 1.10 case 'p': scan_envpath = 1; break;
2184     case 'R': dir_recurse = 1; break;
2185 vapier 1.14 case 'm': dir_crossmount = 0; break;
2186 vapier 1.101 case 'X': ++fix_elf; break;
2187 vapier 1.10 case 'x': show_pax = 1; break;
2188 solar 1.73 case 'e': show_phdr = 1; break;
2189 vapier 1.10 case 't': show_textrel = 1; break;
2190     case 'r': show_rpath = 1; break;
2191 vapier 1.32 case 'n': show_needed = 1; break;
2192 vapier 1.38 case 'i': show_interp = 1; break;
2193 vapier 1.49 case 'b': show_bind = 1; break;
2194 vapier 1.84 case 'S': show_soname = 1; break;
2195 vapier 1.76 case 'T': show_textrels = 1; break;
2196 vapier 1.10 case 'q': be_quiet = 1; break;
2197 vapier 1.14 case 'v': be_verbose = (be_verbose % 20) + 1; break;
2198 solar 1.183 case 'a': show_perms = show_pax = show_phdr = show_textrel = show_rpath = show_bind = show_endian = 1; break;
2199 solar 1.181 case 'D': show_endian = 1; break;
2200 solar 1.191 case 'I': show_osabi = 1; break;
2201     case 'Y': show_eabi = 1; break;
2202 solar 1.223 case 128:
2203 vapier 1.232 root_fd = open(optarg, O_RDONLY|O_CLOEXEC);
2204     if (root_fd == -1)
2205     err("Could not open root: %s", optarg);
2206 solar 1.223 break;
2207 vapier 1.240 case 129: load_cache_config = use_ldpath = 1; break;
2208 vapier 1.10 case ':':
2209 vapier 1.113 err("Option '%c' is missing parameter", optopt);
2210 vapier 1.10 case '?':
2211 solar 1.119 err("Unknown option '%c' or argument missing", optopt);
2212 vapier 1.10 default:
2213 vapier 1.113 err("Unhandled option '%c'; please report this", i);
2214 vapier 1.10 }
2215     }
2216 vapier 1.230 if (show_textrels && be_verbose)
2217     has_objdump = bin_in_path("objdump");
2218 vapier 1.249 /* precompile all the regexes */
2219     if (g_match) {
2220     regex_t preg;
2221     const char *this_sym;
2222     size_t n;
2223     int flags = REG_EXTENDED | REG_NOSUB | (g_match > 1 ? REG_ICASE : 0);
2224    
2225     array_for_each(find_sym_arr, n, this_sym) {
2226     /* see scanelf_match_symname for logic info */
2227     switch (this_sym[0]) {
2228     case '%':
2229     while (*(this_sym++))
2230     if (*this_sym == '%') {
2231     ++this_sym;
2232     break;
2233     }
2234     break;
2235     case '+':
2236     case '-':
2237     ++this_sym;
2238     break;
2239     }
2240     if (*this_sym == '*')
2241     ++this_sym;
2242    
2243     ret = regcomp(&preg, this_sym, flags);
2244     if (ret) {
2245     char err[256];
2246     regerror(ret, &preg, err, sizeof(err));
2247     err("regcomp of %s failed: %s", this_sym, err);
2248     }
2249     xarraypush(find_sym_regex_arr, &preg, sizeof(preg));
2250     }
2251     }
2252 vapier 1.226 /* flatten arrays for display */
2253 vapier 1.248 if (array_cnt(find_sym_arr))
2254     find_sym = array_flatten_str(find_sym_arr);
2255 vapier 1.226 if (array_cnt(find_lib_arr))
2256     find_lib = array_flatten_str(find_lib_arr);
2257     if (array_cnt(find_section_arr))
2258     find_section = array_flatten_str(find_section_arr);
2259 vapier 1.39 /* let the format option override all other options */
2260     if (out_format) {
2261 solar 1.73 show_pax = show_phdr = show_textrel = show_rpath = \
2262 vapier 1.84 show_needed = show_interp = show_bind = show_soname = \
2263 solar 1.191 show_textrels = show_perms = show_endian = show_size = \
2264     show_osabi = show_eabi = 0;
2265 vapier 1.48 for (i = 0; out_format[i]; ++i) {
2266 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
2267 vapier 1.39
2268 vapier 1.48 switch (out_format[++i]) {
2269 solar 1.132 case '+': break;
2270 vapier 1.39 case '%': break;
2271 vapier 1.70 case '#': break;
2272 vapier 1.39 case 'F': break;
2273 vapier 1.66 case 'p': break;
2274     case 'f': break;
2275 solar 1.124 case 'k': break;
2276 vapier 1.39 case 's': break;
2277 vapier 1.72 case 'N': break;
2278 vapier 1.41 case 'o': break;
2279 vapier 1.166 case 'a': break;
2280 vapier 1.171 case 'M': break;
2281 solar 1.190 case 'Z': show_size = 1; break;
2282 solar 1.181 case 'D': show_endian = 1; break;
2283 solar 1.191 case 'I': show_osabi = 1; break;
2284     case 'Y': show_eabi = 1; break;
2285 solar 1.180 case 'O': show_perms = 1; break;
2286 vapier 1.39 case 'x': show_pax = 1; break;
2287 solar 1.73 case 'e': show_phdr = 1; break;
2288 vapier 1.39 case 't': show_textrel = 1; break;
2289     case 'r': show_rpath = 1; break;
2290     case 'n': show_needed = 1; break;
2291     case 'i': show_interp = 1; break;
2292 vapier 1.49 case 'b': show_bind = 1; break;
2293 vapier 1.84 case 'S': show_soname = 1; break;
2294 vapier 1.76 case 'T': show_textrels = 1; break;
2295 vapier 1.39 default:
2296 vapier 1.240 err("invalid format specifier '%c' (byte %i)",
2297 vapier 1.48 out_format[i], i+1);
2298 vapier 1.39 }
2299     }
2300 vapier 1.41
2301     /* construct our default format */
2302     } else {
2303     size_t fmt_len = 30;
2304 vapier 1.186 out_format = xmalloc(sizeof(char) * fmt_len);
2305 vapier 1.194 *out_format = '\0';
2306 vapier 1.76 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
2307     if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
2308 solar 1.180 if (show_perms) xstrcat(&out_format, "%O ", &fmt_len);
2309 solar 1.190 if (show_size) xstrcat(&out_format, "%Z ", &fmt_len);
2310 solar 1.181 if (show_endian) xstrcat(&out_format, "%D ", &fmt_len);
2311 solar 1.191 if (show_osabi) xstrcat(&out_format, "%I ", &fmt_len);
2312     if (show_eabi) xstrcat(&out_format, "%Y ", &fmt_len);
2313 vapier 1.76 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
2314     if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
2315     if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
2316     if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
2317     if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
2318     if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
2319 vapier 1.84 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
2320 vapier 1.76 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
2321     if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
2322 solar 1.124 if (find_section) xstrcat(&out_format, "%k ", &fmt_len);
2323 vapier 1.76 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
2324     if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
2325 vapier 1.39 }
2326 vapier 1.41 if (be_verbose > 2) printf("Format: %s\n", out_format);
2327 vapier 1.39
2328     /* now lets actually do the scanning */
2329 vapier 1.240 if (load_cache_config)
2330     load_ld_cache_config(__PAX_UTILS_DEFAULT_LD_CACHE_CONFIG);
2331 vapier 1.10 if (scan_ldpath) scanelf_ldpath();
2332     if (scan_envpath) scanelf_envpath();
2333 solar 1.153 if (!from_file && optind == argc && ttyname(0) == NULL && !scan_ldpath && !scan_envpath)
2334 vapier 1.133 from_file = "-";
2335 solar 1.45 if (from_file) {
2336     scanelf_from_file(from_file);
2337     from_file = *argv;
2338     }
2339     if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
2340 vapier 1.25 err("Nothing to scan !?");
2341 vapier 1.66 while (optind < argc) {
2342     search_path = argv[optind++];
2343 solar 1.164 ret = scanelf_dir(search_path);
2344 vapier 1.66 }
2345 vapier 1.27
2346 vapier 1.250 #ifdef __PAX_UTILS_CLEANUP
2347 vapier 1.39 /* clean up */
2348 vapier 1.227 xarrayfree(ldpaths);
2349 vapier 1.248 xarrayfree(find_sym_arr);
2350 vapier 1.227 xarrayfree(find_lib_arr);
2351     xarrayfree(find_section_arr);
2352 vapier 1.248 free(find_sym);
2353 vapier 1.226 free(find_lib);
2354     free(find_section);
2355 vapier 1.249 {
2356     size_t n;
2357     regex_t *preg;
2358     array_for_each(find_sym_regex_arr, n, preg)
2359     regfree(preg);
2360     xarrayfree(find_sym_regex_arr);
2361     }
2362 solar 1.96
2363     if (ldcache != 0)
2364     munmap(ldcache, ldcache_size);
2365 vapier 1.250 #endif
2366    
2367 solar 1.164 return ret;
2368 vapier 1.10 }
2369    
2370 vapier 1.150 static char **get_split_env(const char *envvar)
2371     {
2372 vapier 1.152 const char *delims = " \t\n";
2373 solar 1.143 char **envvals = NULL;
2374 vapier 1.152 char *env, *s;
2375 kevquinn 1.142 int nentry;
2376    
2377 solar 1.143 if ((env = getenv(envvar)) == NULL)
2378     return NULL;
2379 kevquinn 1.142
2380 solar 1.143 env = xstrdup(env);
2381     if (env == NULL)
2382     return NULL;
2383 kevquinn 1.142
2384 vapier 1.152 s = strtok(env, delims);
2385     if (s == NULL) {
2386     free(env);
2387     return NULL;
2388     }
2389    
2390 solar 1.143 nentry = 0;
2391 vapier 1.152 while (s != NULL) {
2392     ++nentry;
2393     envvals = xrealloc(envvals, sizeof(*envvals) * (nentry+1));
2394     envvals[nentry-1] = s;
2395     s = strtok(NULL, delims);
2396 kevquinn 1.142 }
2397 vapier 1.152 envvals[nentry] = NULL;
2398 kevquinn 1.142
2399 vapier 1.152 /* don't want to free(env) as it contains the memory that backs
2400     * the envvals array of strings */
2401 kevquinn 1.142 return envvals;
2402     }
2403 solar 1.181
2404 vapier 1.184 static void parseenv(void)
2405 vapier 1.150 {
2406 vapier 1.221 color_init(false);
2407 vapier 1.150 qa_textrels = get_split_env("QA_TEXTRELS");
2408     qa_execstack = get_split_env("QA_EXECSTACK");
2409     qa_wx_load = get_split_env("QA_WX_LOAD");
2410 vapier 1.41 }
2411 solar 1.163
2412 vapier 1.152 #ifdef __PAX_UTILS_CLEANUP
2413 vapier 1.184 static void cleanup(void)
2414 vapier 1.152 {
2415     free(out_format);
2416     free(qa_textrels);
2417     free(qa_execstack);
2418     free(qa_wx_load);
2419     }
2420     #endif
2421 vapier 1.41
2422 vapier 1.10 int main(int argc, char *argv[])
2423 solar 1.1 {
2424 solar 1.164 int ret;
2425 vapier 1.10 if (argc < 2)
2426     usage(EXIT_FAILURE);
2427 kevquinn 1.142 parseenv();
2428 solar 1.164 ret = parseargs(argc, argv);
2429 solar 1.21 fclose(stdout);
2430 vapier 1.152 #ifdef __PAX_UTILS_CLEANUP
2431     cleanup();
2432     warn("The calls to add/delete heap should be off:\n"
2433 vapier 1.232 "\t- 1 due to the out_buffer not being freed in scanelf_fileat()\n"
2434 vapier 1.152 "\t- 1 per QA_TEXTRELS/QA_EXECSTACK/QA_WX_LOAD");
2435 solar 1.61 #endif
2436 solar 1.164 return ret;
2437 solar 1.1 }
2438 vapier 1.155
2439     /* Match filename against entries in matchlist, return TRUE
2440     * if the file is listed */
2441     static int file_matches_list(const char *filename, char **matchlist)
2442     {
2443     char **file;
2444     char *match;
2445     char buf[__PAX_UTILS_PATH_MAX];
2446    
2447     if (matchlist == NULL)
2448     return 0;
2449    
2450     for (file = matchlist; *file != NULL; file++) {
2451     if (search_path) {
2452     snprintf(buf, sizeof(buf), "%s%s", search_path, *file);
2453     match = buf;
2454     } else {
2455     match = *file;
2456     }
2457     if (fnmatch(match, filename, 0) == 0)
2458     return 1;
2459     }
2460     return 0;
2461     }

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