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/* |
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* Copyright 2003-2005 Gentoo Foundation |
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* Distributed under the terms of the GNU General Public License v2 |
4 |
* $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.93 2005/12/10 04:07:55 vapier Exp $ |
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* |
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* Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> |
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* Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> |
8 |
*/ |
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|
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#include <stdio.h> |
11 |
#include <stdlib.h> |
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#include <sys/types.h> |
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#include <libgen.h> |
14 |
#include <limits.h> |
15 |
#include <string.h> |
16 |
#include <errno.h> |
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#include <unistd.h> |
18 |
#include <sys/stat.h> |
19 |
#include <dirent.h> |
20 |
#include <getopt.h> |
21 |
#include <assert.h> |
22 |
#include "paxinc.h" |
23 |
|
24 |
static const char *rcsid = "$Id: scanelf.c,v 1.93 2005/12/10 04:07:55 vapier Exp $"; |
25 |
#define argv0 "scanelf" |
26 |
|
27 |
#define IS_MODIFIER(c) (c == '%' || c == '#') |
28 |
|
29 |
|
30 |
|
31 |
/* prototypes */ |
32 |
static void scanelf_file(const char *filename); |
33 |
static void scanelf_dir(const char *path); |
34 |
static void scanelf_ldpath(); |
35 |
static void scanelf_envpath(); |
36 |
static void usage(int status); |
37 |
static void parseargs(int argc, char *argv[]); |
38 |
static char *xstrdup(const char *s); |
39 |
static void *xmalloc(size_t size); |
40 |
static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n); |
41 |
#define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0) |
42 |
static inline void xchrcat(char **dst, const char append, size_t *curr_len); |
43 |
|
44 |
/* variables to control behavior */ |
45 |
static char *ldpaths[256]; |
46 |
static char scan_ldpath = 0; |
47 |
static char scan_envpath = 0; |
48 |
static char scan_symlink = 1; |
49 |
static char dir_recurse = 0; |
50 |
static char dir_crossmount = 1; |
51 |
static char show_pax = 0; |
52 |
static char show_phdr = 0; |
53 |
static char show_textrel = 0; |
54 |
static char show_rpath = 0; |
55 |
static char show_needed = 0; |
56 |
static char show_interp = 0; |
57 |
static char show_bind = 0; |
58 |
static char show_soname = 0; |
59 |
static char show_textrels = 0; |
60 |
static char show_banner = 1; |
61 |
static char be_quiet = 0; |
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static char be_verbose = 0; |
63 |
static char be_wewy_wewy_quiet = 0; |
64 |
static char *find_sym = NULL, *versioned_symname = NULL; |
65 |
static char *find_lib = NULL; |
66 |
static char *out_format = NULL; |
67 |
static char *search_path = NULL; |
68 |
static char gmatch = 0; |
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|
70 |
|
71 |
/* sub-funcs for scanelf_file() */ |
72 |
static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) |
73 |
{ |
74 |
/* find the best SHT_DYNSYM and SHT_STRTAB sections */ |
75 |
#define GET_SYMTABS(B) \ |
76 |
if (elf->elf_class == ELFCLASS ## B) { \ |
77 |
Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ |
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/* debug sections */ \ |
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symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ |
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strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ |
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/* runtime sections */ \ |
82 |
dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ |
83 |
dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ |
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if (symtab && dynsym) { \ |
85 |
*sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ |
86 |
} else { \ |
87 |
*sym = (void*)(symtab ? symtab : dynsym); \ |
88 |
} \ |
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if (strtab && dynstr) { \ |
90 |
*tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ |
91 |
} else { \ |
92 |
*tab = (void*)(strtab ? strtab : dynstr); \ |
93 |
} \ |
94 |
} |
95 |
GET_SYMTABS(32) |
96 |
GET_SYMTABS(64) |
97 |
} |
98 |
static char *scanelf_file_pax(elfobj *elf, char *found_pax) |
99 |
{ |
100 |
static char ret[7]; |
101 |
unsigned long i, shown; |
102 |
|
103 |
if (!show_pax) return NULL; |
104 |
|
105 |
shown = 0; |
106 |
memset(&ret, 0, sizeof(ret)); |
107 |
|
108 |
if (elf->phdr) { |
109 |
#define SHOW_PAX(B) \ |
110 |
if (elf->elf_class == ELFCLASS ## B) { \ |
111 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
112 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
113 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
114 |
if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \ |
115 |
continue; \ |
116 |
if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \ |
117 |
continue; \ |
118 |
memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \ |
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*found_pax = 1; \ |
120 |
++shown; \ |
121 |
break; \ |
122 |
} \ |
123 |
} |
124 |
SHOW_PAX(32) |
125 |
SHOW_PAX(64) |
126 |
} |
127 |
|
128 |
/* fall back to EI_PAX if no PT_PAX was found */ |
129 |
if (!*ret) { |
130 |
static char *paxflags; |
131 |
paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf)); |
132 |
if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) { |
133 |
*found_pax = 1; |
134 |
return (be_wewy_wewy_quiet ? NULL : paxflags); |
135 |
} |
136 |
strncpy(ret, paxflags, sizeof(ret)); |
137 |
} |
138 |
|
139 |
if (be_wewy_wewy_quiet || (be_quiet && !shown)) |
140 |
return NULL; |
141 |
else |
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return ret; |
143 |
} |
144 |
|
145 |
static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load) |
146 |
{ |
147 |
static char ret[12]; |
148 |
char *found; |
149 |
unsigned long i, shown; |
150 |
unsigned char multi_stack, multi_relro, multi_load; |
151 |
|
152 |
if (!show_phdr) return NULL; |
153 |
|
154 |
memcpy(ret, "--- --- ---\0", 12); |
155 |
|
156 |
shown = 0; |
157 |
multi_stack = multi_relro = multi_load = 0; |
158 |
|
159 |
#define SHOW_PHDR(B) \ |
160 |
if (elf->elf_class == ELFCLASS ## B) { \ |
161 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
162 |
Elf ## B ## _Off offset; \ |
163 |
uint32_t flags, check_flags; \ |
164 |
if (elf->phdr != NULL) { \ |
165 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
166 |
for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \ |
167 |
if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ |
168 |
if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \ |
169 |
found = found_phdr; \ |
170 |
offset = 0; \ |
171 |
check_flags = PF_X; \ |
172 |
} else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ |
173 |
if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \ |
174 |
found = found_relro; \ |
175 |
offset = 4; \ |
176 |
check_flags = PF_X; \ |
177 |
} else if (EGET(phdr[i].p_type) == PT_LOAD) { \ |
178 |
if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \ |
179 |
found = found_load; \ |
180 |
offset = 8; \ |
181 |
check_flags = PF_W|PF_X; \ |
182 |
} else \ |
183 |
continue; \ |
184 |
flags = EGET(phdr[i].p_flags); \ |
185 |
if (be_quiet && ((flags & check_flags) != check_flags)) \ |
186 |
continue; \ |
187 |
memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \ |
188 |
*found = 1; \ |
189 |
++shown; \ |
190 |
} \ |
191 |
} else if (elf->shdr != NULL) { \ |
192 |
/* no program headers which means this is prob an object file */ \ |
193 |
Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ |
194 |
Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \ |
195 |
check_flags = SHF_WRITE|SHF_EXECINSTR; \ |
196 |
for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \ |
197 |
if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \ |
198 |
offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \ |
199 |
if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \ |
200 |
if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \ |
201 |
flags = EGET(shdr[i].sh_flags); \ |
202 |
if (be_quiet && ((flags & check_flags) != check_flags)) \ |
203 |
continue; \ |
204 |
++*found_phdr; \ |
205 |
shown = 1; \ |
206 |
if (flags & SHF_WRITE) ret[0] = 'W'; \ |
207 |
if (flags & SHF_ALLOC) ret[1] = 'A'; \ |
208 |
if (flags & SHF_EXECINSTR) ret[2] = 'X'; \ |
209 |
if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \ |
210 |
break; \ |
211 |
} \ |
212 |
} \ |
213 |
if (!multi_stack) { \ |
214 |
*found_phdr = 1; \ |
215 |
shown = 1; \ |
216 |
memcpy(ret, "!WX", 3); \ |
217 |
} \ |
218 |
} \ |
219 |
} |
220 |
SHOW_PHDR(32) |
221 |
SHOW_PHDR(64) |
222 |
|
223 |
if (be_wewy_wewy_quiet || (be_quiet && !shown)) |
224 |
return NULL; |
225 |
else |
226 |
return ret; |
227 |
} |
228 |
static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel) |
229 |
{ |
230 |
static const char *ret = "TEXTREL"; |
231 |
unsigned long i; |
232 |
|
233 |
if (!show_textrel && !show_textrels) return NULL; |
234 |
|
235 |
if (elf->phdr) { |
236 |
#define SHOW_TEXTREL(B) \ |
237 |
if (elf->elf_class == ELFCLASS ## B) { \ |
238 |
Elf ## B ## _Dyn *dyn; \ |
239 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
240 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
241 |
Elf ## B ## _Off offset; \ |
242 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
243 |
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ |
244 |
offset = EGET(phdr[i].p_offset); \ |
245 |
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ |
246 |
dyn = DYN ## B (elf->data + offset); \ |
247 |
while (EGET(dyn->d_tag) != DT_NULL) { \ |
248 |
if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ |
249 |
*found_textrel = 1; \ |
250 |
/*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ |
251 |
return (be_wewy_wewy_quiet ? NULL : ret); \ |
252 |
} \ |
253 |
++dyn; \ |
254 |
} \ |
255 |
} } |
256 |
SHOW_TEXTREL(32) |
257 |
SHOW_TEXTREL(64) |
258 |
} |
259 |
|
260 |
if (be_quiet || be_wewy_wewy_quiet) |
261 |
return NULL; |
262 |
else |
263 |
return " - "; |
264 |
} |
265 |
static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel) |
266 |
{ |
267 |
unsigned long s, r, rmax; |
268 |
void *symtab_void, *strtab_void, *text_void; |
269 |
|
270 |
if (!show_textrels) return NULL; |
271 |
|
272 |
/* don't search for TEXTREL's if the ELF doesn't have any */ |
273 |
if (!*found_textrel) scanelf_file_textrel(elf, found_textrel); |
274 |
if (!*found_textrel) return NULL; |
275 |
|
276 |
scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); |
277 |
text_void = elf_findsecbyname(elf, ".text"); |
278 |
|
279 |
if (symtab_void && strtab_void && text_void && elf->shdr) { |
280 |
#define SHOW_TEXTRELS(B) \ |
281 |
if (elf->elf_class == ELFCLASS ## B) { \ |
282 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
283 |
Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \ |
284 |
Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ |
285 |
Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ |
286 |
Elf ## B ## _Shdr *text = SHDR ## B (text_void); \ |
287 |
Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \ |
288 |
uint ## B ## _t memsz = EGET(text->sh_size); \ |
289 |
Elf ## B ## _Rel *rel; \ |
290 |
Elf ## B ## _Rela *rela; \ |
291 |
/* search the section headers for relocations */ \ |
292 |
for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \ |
293 |
uint32_t sh_type = EGET(shdr[s].sh_type); \ |
294 |
if (sh_type == SHT_REL) { \ |
295 |
rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \ |
296 |
rela = NULL; \ |
297 |
rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \ |
298 |
} else if (sh_type == SHT_RELA) { \ |
299 |
rel = NULL; \ |
300 |
rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \ |
301 |
rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \ |
302 |
} else \ |
303 |
continue; \ |
304 |
/* now see if any of the relocs are in the .text */ \ |
305 |
for (r = 0; r < rmax; ++r) { \ |
306 |
unsigned long sym_max; \ |
307 |
Elf ## B ## _Addr offset_tmp; \ |
308 |
Elf ## B ## _Sym *func; \ |
309 |
Elf ## B ## _Sym *sym; \ |
310 |
Elf ## B ## _Addr r_offset; \ |
311 |
uint ## B ## _t r_info; \ |
312 |
if (sh_type == SHT_REL) { \ |
313 |
r_offset = EGET(rel[r].r_offset); \ |
314 |
r_info = EGET(rel[r].r_info); \ |
315 |
} else { \ |
316 |
r_offset = EGET(rela[r].r_offset); \ |
317 |
r_info = EGET(rela[r].r_info); \ |
318 |
} \ |
319 |
/* make sure this relocation is inside of the .text */ \ |
320 |
if (r_offset < vaddr || r_offset >= vaddr + memsz) { \ |
321 |
if (be_verbose <= 2) continue; \ |
322 |
} else \ |
323 |
*found_textrels = 1; \ |
324 |
/* locate this relocation symbol name */ \ |
325 |
sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ |
326 |
sym_max = ELF ## B ## _R_SYM(r_info); \ |
327 |
if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \ |
328 |
sym += sym_max; \ |
329 |
else \ |
330 |
sym = NULL; \ |
331 |
sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ |
332 |
/* show the raw details about this reloc */ \ |
333 |
printf(" %s: ", elf->base_filename); \ |
334 |
if (sym && sym->st_name) \ |
335 |
printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \ |
336 |
else \ |
337 |
printf("(memory/fake?)"); \ |
338 |
printf(" [0x%lX]", (unsigned long)r_offset); \ |
339 |
/* now try to find the closest symbol that this rel is probably in */ \ |
340 |
sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ |
341 |
func = NULL; \ |
342 |
offset_tmp = 0; \ |
343 |
while (sym_max--) { \ |
344 |
if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \ |
345 |
func = sym; \ |
346 |
offset_tmp = EGET(sym->st_value); \ |
347 |
} \ |
348 |
++sym; \ |
349 |
} \ |
350 |
printf(" in "); \ |
351 |
if (func && func->st_name) \ |
352 |
printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \ |
353 |
else \ |
354 |
printf("(NULL: fake?)"); \ |
355 |
printf(" [0x%lX]\n", (unsigned long)offset_tmp); \ |
356 |
} \ |
357 |
} } |
358 |
SHOW_TEXTRELS(32) |
359 |
SHOW_TEXTRELS(64) |
360 |
} |
361 |
if (!*found_textrels) |
362 |
warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename); |
363 |
|
364 |
return NULL; |
365 |
} |
366 |
|
367 |
static void rpath_security_checks(elfobj *, char *); |
368 |
static void rpath_security_checks(elfobj *elf, char *item) { |
369 |
struct stat st; |
370 |
switch (*item) { |
371 |
case '/': break; |
372 |
case '.': |
373 |
warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename); |
374 |
break; |
375 |
case '\0': |
376 |
warnf("Security problem NULL RPATH in %s", elf->filename); |
377 |
break; |
378 |
case '$': |
379 |
if (fstat(elf->fd, &st) != -1) |
380 |
if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID)) |
381 |
warnf("Security problem with RPATH='%s' in %s with mode set of %o", |
382 |
item, elf->filename, st.st_mode & 07777); |
383 |
break; |
384 |
default: |
385 |
warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename); |
386 |
break; |
387 |
} |
388 |
} |
389 |
static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) |
390 |
{ |
391 |
unsigned long i, s; |
392 |
char *rpath, *runpath, **r; |
393 |
void *strtbl_void; |
394 |
|
395 |
if (!show_rpath) return; |
396 |
|
397 |
strtbl_void = elf_findsecbyname(elf, ".dynstr"); |
398 |
rpath = runpath = NULL; |
399 |
|
400 |
if (elf->phdr && strtbl_void) { |
401 |
#define SHOW_RPATH(B) \ |
402 |
if (elf->elf_class == ELFCLASS ## B) { \ |
403 |
Elf ## B ## _Dyn *dyn; \ |
404 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
405 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
406 |
Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ |
407 |
Elf ## B ## _Off offset; \ |
408 |
Elf ## B ## _Xword word; \ |
409 |
/* Scan all the program headers */ \ |
410 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
411 |
/* Just scan dynamic headers */ \ |
412 |
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ |
413 |
offset = EGET(phdr[i].p_offset); \ |
414 |
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ |
415 |
/* Just scan dynamic RPATH/RUNPATH headers */ \ |
416 |
dyn = DYN ## B (elf->data + offset); \ |
417 |
while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ |
418 |
if (word == DT_RPATH) { \ |
419 |
r = &rpath; \ |
420 |
} else if (word == DT_RUNPATH) { \ |
421 |
r = &runpath; \ |
422 |
} else { \ |
423 |
++dyn; \ |
424 |
continue; \ |
425 |
} \ |
426 |
/* Verify the memory is somewhat sane */ \ |
427 |
offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ |
428 |
if (offset < (Elf ## B ## _Off)elf->len) { \ |
429 |
if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ |
430 |
*r = (char*)(elf->data + offset); \ |
431 |
/* If quiet, don't output paths in ld.so.conf */ \ |
432 |
if (be_quiet) { \ |
433 |
size_t len; \ |
434 |
char *start, *end; \ |
435 |
/* note that we only 'chop' off leading known paths. */ \ |
436 |
/* since *r is read-only memory, we can only move the ptr forward. */ \ |
437 |
start = *r; \ |
438 |
/* scan each path in : delimited list */ \ |
439 |
while (start) { \ |
440 |
rpath_security_checks(elf, start); \ |
441 |
end = strchr(start, ':'); \ |
442 |
len = (end ? abs(end - start) : strlen(start)); \ |
443 |
for (s = 0; ldpaths[s]; ++s) { \ |
444 |
if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \ |
445 |
*r = (end ? end + 1 : NULL); \ |
446 |
break; \ |
447 |
} \ |
448 |
} \ |
449 |
if (!*r || !ldpaths[s] || !end) \ |
450 |
start = NULL; \ |
451 |
else \ |
452 |
start = start + len + 1; \ |
453 |
} \ |
454 |
} \ |
455 |
if (*r) *found_rpath = 1; \ |
456 |
} \ |
457 |
++dyn; \ |
458 |
} \ |
459 |
} } |
460 |
SHOW_RPATH(32) |
461 |
SHOW_RPATH(64) |
462 |
} |
463 |
|
464 |
if (be_wewy_wewy_quiet) return; |
465 |
|
466 |
if (rpath && runpath) { |
467 |
if (!strcmp(rpath, runpath)) { |
468 |
xstrcat(ret, runpath, ret_len); |
469 |
} else { |
470 |
fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath); |
471 |
xchrcat(ret, '{', ret_len); |
472 |
xstrcat(ret, rpath, ret_len); |
473 |
xchrcat(ret, ',', ret_len); |
474 |
xstrcat(ret, runpath, ret_len); |
475 |
xchrcat(ret, '}', ret_len); |
476 |
} |
477 |
} else if (rpath || runpath) |
478 |
xstrcat(ret, (runpath ? runpath : rpath), ret_len); |
479 |
else if (!be_quiet) |
480 |
xstrcat(ret, " - ", ret_len); |
481 |
} |
482 |
static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len) |
483 |
{ |
484 |
unsigned long i; |
485 |
char *needed; |
486 |
void *strtbl_void; |
487 |
|
488 |
if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL; |
489 |
|
490 |
strtbl_void = elf_findsecbyname(elf, ".dynstr"); |
491 |
|
492 |
if (elf->phdr && strtbl_void) { |
493 |
#define SHOW_NEEDED(B) \ |
494 |
if (elf->elf_class == ELFCLASS ## B) { \ |
495 |
Elf ## B ## _Dyn *dyn; \ |
496 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
497 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
498 |
Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ |
499 |
Elf ## B ## _Off offset; \ |
500 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
501 |
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ |
502 |
offset = EGET(phdr[i].p_offset); \ |
503 |
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ |
504 |
dyn = DYN ## B (elf->data + offset); \ |
505 |
while (EGET(dyn->d_tag) != DT_NULL) { \ |
506 |
if (EGET(dyn->d_tag) == DT_NEEDED) { \ |
507 |
offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ |
508 |
if (offset >= (Elf ## B ## _Off)elf->len) { \ |
509 |
++dyn; \ |
510 |
continue; \ |
511 |
} \ |
512 |
needed = (char*)(elf->data + offset); \ |
513 |
if (op == 0) { \ |
514 |
if (!be_wewy_wewy_quiet) { \ |
515 |
if (*found_needed) xchrcat(ret, ',', ret_len); \ |
516 |
xstrcat(ret, needed, ret_len); \ |
517 |
} \ |
518 |
*found_needed = 1; \ |
519 |
} else { \ |
520 |
if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \ |
521 |
*found_lib = 1; \ |
522 |
return (be_wewy_wewy_quiet ? NULL : needed); \ |
523 |
} \ |
524 |
} \ |
525 |
} \ |
526 |
++dyn; \ |
527 |
} \ |
528 |
} } |
529 |
SHOW_NEEDED(32) |
530 |
SHOW_NEEDED(64) |
531 |
if (op == 0 && !*found_needed && be_verbose) |
532 |
warn("ELF lacks DT_NEEDED sections: %s", elf->filename); |
533 |
} |
534 |
|
535 |
return NULL; |
536 |
} |
537 |
static char *scanelf_file_interp(elfobj *elf, char *found_interp) |
538 |
{ |
539 |
void *strtbl_void; |
540 |
|
541 |
if (!show_interp) return NULL; |
542 |
|
543 |
strtbl_void = elf_findsecbyname(elf, ".interp"); |
544 |
|
545 |
if (strtbl_void) { |
546 |
#define SHOW_INTERP(B) \ |
547 |
if (elf->elf_class == ELFCLASS ## B) { \ |
548 |
Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ |
549 |
*found_interp = 1; \ |
550 |
return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \ |
551 |
} |
552 |
SHOW_INTERP(32) |
553 |
SHOW_INTERP(64) |
554 |
} |
555 |
return NULL; |
556 |
} |
557 |
static char *scanelf_file_bind(elfobj *elf, char *found_bind) |
558 |
{ |
559 |
unsigned long i; |
560 |
struct stat s; |
561 |
|
562 |
if (!show_bind) return NULL; |
563 |
if (!elf->phdr) return NULL; |
564 |
|
565 |
#define SHOW_BIND(B) \ |
566 |
if (elf->elf_class == ELFCLASS ## B) { \ |
567 |
Elf ## B ## _Dyn *dyn; \ |
568 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
569 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
570 |
Elf ## B ## _Off offset; \ |
571 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
572 |
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ |
573 |
offset = EGET(phdr[i].p_offset); \ |
574 |
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ |
575 |
dyn = DYN ## B (elf->data + offset); \ |
576 |
while (EGET(dyn->d_tag) != DT_NULL) { \ |
577 |
if (EGET(dyn->d_tag) == DT_BIND_NOW || \ |
578 |
(EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ |
579 |
{ \ |
580 |
if (be_quiet) return NULL; \ |
581 |
*found_bind = 1; \ |
582 |
return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \ |
583 |
} \ |
584 |
++dyn; \ |
585 |
} \ |
586 |
} \ |
587 |
} |
588 |
SHOW_BIND(32) |
589 |
SHOW_BIND(64) |
590 |
|
591 |
if (be_wewy_wewy_quiet) return NULL; |
592 |
|
593 |
if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { |
594 |
return NULL; |
595 |
} else { |
596 |
*found_bind = 1; |
597 |
return (char *) "LAZY"; |
598 |
} |
599 |
} |
600 |
static char *scanelf_file_soname(elfobj *elf, char *found_soname) |
601 |
{ |
602 |
unsigned long i; |
603 |
char *soname; |
604 |
void *strtbl_void; |
605 |
|
606 |
if (!show_soname) return NULL; |
607 |
|
608 |
strtbl_void = elf_findsecbyname(elf, ".dynstr"); |
609 |
|
610 |
if (elf->phdr && strtbl_void) { |
611 |
#define SHOW_SONAME(B) \ |
612 |
if (elf->elf_class == ELFCLASS ## B) { \ |
613 |
Elf ## B ## _Dyn *dyn; \ |
614 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
615 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
616 |
Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ |
617 |
Elf ## B ## _Off offset; \ |
618 |
/* only look for soname in shared objects */ \ |
619 |
if (ehdr->e_type != ET_DYN) \ |
620 |
return NULL; \ |
621 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
622 |
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ |
623 |
offset = EGET(phdr[i].p_offset); \ |
624 |
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ |
625 |
dyn = DYN ## B (elf->data + offset); \ |
626 |
while (EGET(dyn->d_tag) != DT_NULL) { \ |
627 |
if (EGET(dyn->d_tag) == DT_SONAME) { \ |
628 |
offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ |
629 |
if (offset >= (Elf ## B ## _Off)elf->len) { \ |
630 |
++dyn; \ |
631 |
continue; \ |
632 |
} \ |
633 |
soname = (char*)(elf->data + offset); \ |
634 |
*found_soname = 1; \ |
635 |
return (be_wewy_wewy_quiet ? NULL : soname); \ |
636 |
} \ |
637 |
++dyn; \ |
638 |
} \ |
639 |
} } |
640 |
SHOW_SONAME(32) |
641 |
SHOW_SONAME(64) |
642 |
} |
643 |
|
644 |
return NULL; |
645 |
} |
646 |
static char *scanelf_file_sym(elfobj *elf, char *found_sym) |
647 |
{ |
648 |
unsigned long i; |
649 |
char *ret; |
650 |
void *symtab_void, *strtab_void; |
651 |
|
652 |
if (!find_sym) return NULL; |
653 |
ret = find_sym; |
654 |
|
655 |
scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void); |
656 |
|
657 |
if (symtab_void && strtab_void) { |
658 |
#define FIND_SYM(B) \ |
659 |
if (elf->elf_class == ELFCLASS ## B) { \ |
660 |
Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ |
661 |
Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ |
662 |
Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ |
663 |
unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ |
664 |
char *symname; \ |
665 |
for (i = 0; i < cnt; ++i) { \ |
666 |
if (sym->st_name) { \ |
667 |
symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ |
668 |
if (*find_sym == '*') { \ |
669 |
printf("%s(%s) %5lX %15s %s\n", \ |
670 |
((*found_sym == 0) ? "\n\t" : "\t"), \ |
671 |
elf->base_filename, \ |
672 |
(unsigned long)sym->st_size, \ |
673 |
get_elfstttype(sym->st_info), \ |
674 |
symname); \ |
675 |
*found_sym = 1; \ |
676 |
} else { \ |
677 |
char *this_sym, *next_sym; \ |
678 |
this_sym = find_sym; \ |
679 |
do { \ |
680 |
next_sym = strchr(this_sym, ','); \ |
681 |
if (next_sym == NULL) \ |
682 |
next_sym = this_sym + strlen(this_sym); \ |
683 |
if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \ |
684 |
(strcmp(symname, versioned_symname) == 0)) { \ |
685 |
ret = this_sym; \ |
686 |
(*found_sym)++; \ |
687 |
goto break_out; \ |
688 |
} \ |
689 |
this_sym = next_sym + 1; \ |
690 |
} while (*next_sym != '\0'); \ |
691 |
} \ |
692 |
} \ |
693 |
++sym; \ |
694 |
} } |
695 |
FIND_SYM(32) |
696 |
FIND_SYM(64) |
697 |
} |
698 |
|
699 |
break_out: |
700 |
if (be_wewy_wewy_quiet) return NULL; |
701 |
|
702 |
if (*find_sym != '*' && *found_sym) |
703 |
return ret; |
704 |
if (be_quiet) |
705 |
return NULL; |
706 |
else |
707 |
return (char *)" - "; |
708 |
} |
709 |
/* scan an elf file and show all the fun stuff */ |
710 |
#define prints(str) write(fileno(stdout), str, strlen(str)) |
711 |
static void scanelf_file(const char *filename) |
712 |
{ |
713 |
unsigned long i; |
714 |
char found_pax, found_phdr, found_relro, found_load, found_textrel, |
715 |
found_rpath, found_needed, found_interp, found_bind, found_soname, |
716 |
found_sym, found_lib, found_file, found_textrels; |
717 |
elfobj *elf; |
718 |
struct stat st; |
719 |
static char *out_buffer = NULL; |
720 |
static size_t out_len; |
721 |
|
722 |
/* make sure 'filename' exists */ |
723 |
if (lstat(filename, &st) == -1) { |
724 |
if (be_verbose > 2) printf("%s: does not exist\n", filename); |
725 |
return; |
726 |
} |
727 |
/* always handle regular files and handle symlinked files if no -y */ |
728 |
if (S_ISLNK(st.st_mode)) { |
729 |
if (!scan_symlink) return; |
730 |
stat(filename, &st); |
731 |
} |
732 |
if (!S_ISREG(st.st_mode)) { |
733 |
if (be_verbose > 2) printf("%s: skipping non-file\n", filename); |
734 |
return; |
735 |
} |
736 |
|
737 |
found_pax = found_phdr = found_relro = found_load = found_textrel = \ |
738 |
found_rpath = found_needed = found_interp = found_bind = found_soname = \ |
739 |
found_sym = found_lib = found_file = found_textrels = 0; |
740 |
|
741 |
/* verify this is real ELF */ |
742 |
if ((elf = readelf(filename)) == NULL) { |
743 |
if (be_verbose > 2) printf("%s: not an ELF\n", filename); |
744 |
return; |
745 |
} |
746 |
|
747 |
if (be_verbose > 1) |
748 |
printf("%s: scanning file {%s,%s}\n", filename, |
749 |
get_elfeitype(EI_CLASS, elf->elf_class), |
750 |
get_elfeitype(EI_DATA, elf->data[EI_DATA])); |
751 |
else if (be_verbose) |
752 |
printf("%s: scanning file\n", filename); |
753 |
|
754 |
/* init output buffer */ |
755 |
if (!out_buffer) { |
756 |
out_len = sizeof(char) * 80; |
757 |
out_buffer = (char*)xmalloc(out_len); |
758 |
} |
759 |
*out_buffer = '\0'; |
760 |
|
761 |
/* show the header */ |
762 |
if (!be_quiet && show_banner) { |
763 |
for (i = 0; out_format[i]; ++i) { |
764 |
if (!IS_MODIFIER(out_format[i])) continue; |
765 |
|
766 |
switch (out_format[++i]) { |
767 |
case '%': break; |
768 |
case '#': break; |
769 |
case 'F': |
770 |
case 'p': |
771 |
case 'f': prints("FILE "); found_file = 1; break; |
772 |
case 'o': prints(" TYPE "); break; |
773 |
case 'x': prints(" PAX "); break; |
774 |
case 'e': prints("STK/REL/PTL "); break; |
775 |
case 't': prints("TEXTREL "); break; |
776 |
case 'r': prints("RPATH "); break; |
777 |
case 'n': prints("NEEDED "); break; |
778 |
case 'i': prints("INTERP "); break; |
779 |
case 'b': prints("BIND "); break; |
780 |
case 'S': prints("SONAME "); break; |
781 |
case 's': prints("SYM "); break; |
782 |
case 'N': prints("LIB "); break; |
783 |
case 'T': prints("TEXTRELS "); break; |
784 |
default: warnf("'%c' has no title ?", out_format[i]); |
785 |
} |
786 |
} |
787 |
if (!found_file) prints("FILE "); |
788 |
prints("\n"); |
789 |
found_file = 0; |
790 |
show_banner = 0; |
791 |
} |
792 |
|
793 |
/* dump all the good stuff */ |
794 |
for (i = 0; out_format[i]; ++i) { |
795 |
const char *out; |
796 |
const char *tmp; |
797 |
|
798 |
/* make sure we trim leading spaces in quiet mode */ |
799 |
if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) |
800 |
*out_buffer = '\0'; |
801 |
|
802 |
if (!IS_MODIFIER(out_format[i])) { |
803 |
xchrcat(&out_buffer, out_format[i], &out_len); |
804 |
continue; |
805 |
} |
806 |
|
807 |
out = NULL; |
808 |
be_wewy_wewy_quiet = (out_format[i] == '#'); |
809 |
switch (out_format[++i]) { |
810 |
case '%': |
811 |
case '#': |
812 |
xchrcat(&out_buffer, out_format[i], &out_len); break; |
813 |
case 'F': |
814 |
found_file = 1; |
815 |
if (be_wewy_wewy_quiet) break; |
816 |
xstrcat(&out_buffer, filename, &out_len); |
817 |
break; |
818 |
case 'p': |
819 |
found_file = 1; |
820 |
if (be_wewy_wewy_quiet) break; |
821 |
tmp = filename; |
822 |
if (search_path) { |
823 |
ssize_t len_search = strlen(search_path); |
824 |
ssize_t len_file = strlen(filename); |
825 |
if (!strncmp(filename, search_path, len_search) && \ |
826 |
len_file > len_search) |
827 |
tmp += len_search; |
828 |
if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; |
829 |
} |
830 |
xstrcat(&out_buffer, tmp, &out_len); |
831 |
break; |
832 |
case 'f': |
833 |
found_file = 1; |
834 |
if (be_wewy_wewy_quiet) break; |
835 |
tmp = strrchr(filename, '/'); |
836 |
tmp = (tmp == NULL ? filename : tmp+1); |
837 |
xstrcat(&out_buffer, tmp, &out_len); |
838 |
break; |
839 |
case 'o': out = get_elfetype(elf); break; |
840 |
case 'x': out = scanelf_file_pax(elf, &found_pax); break; |
841 |
case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; |
842 |
case 't': out = scanelf_file_textrel(elf, &found_textrel); break; |
843 |
case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break; |
844 |
case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; |
845 |
case 'n': |
846 |
case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break; |
847 |
case 'i': out = scanelf_file_interp(elf, &found_interp); break; |
848 |
case 'b': out = scanelf_file_bind(elf, &found_bind); break; |
849 |
case 'S': out = scanelf_file_soname(elf, &found_soname); break; |
850 |
case 's': out = scanelf_file_sym(elf, &found_sym); break; |
851 |
default: warnf("'%c' has no scan code?", out_format[i]); |
852 |
} |
853 |
if (out) { |
854 |
/* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */ |
855 |
if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL) |
856 |
xstrncat(&out_buffer, out, &out_len, (tmp-out)); |
857 |
else |
858 |
xstrcat(&out_buffer, out, &out_len); |
859 |
} |
860 |
} |
861 |
|
862 |
#define FOUND_SOMETHING() \ |
863 |
(found_pax || found_phdr || found_relro || found_load || found_textrel || \ |
864 |
found_rpath || found_needed || found_interp || found_bind || \ |
865 |
found_soname || found_sym || found_lib || found_textrels) |
866 |
|
867 |
if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { |
868 |
xchrcat(&out_buffer, ' ', &out_len); |
869 |
xstrcat(&out_buffer, filename, &out_len); |
870 |
} |
871 |
if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { |
872 |
puts(out_buffer); |
873 |
fflush(stdout); |
874 |
} |
875 |
|
876 |
unreadelf(elf); |
877 |
} |
878 |
|
879 |
/* scan a directory for ET_EXEC files and print when we find one */ |
880 |
static void scanelf_dir(const char *path) |
881 |
{ |
882 |
register DIR *dir; |
883 |
register struct dirent *dentry; |
884 |
struct stat st_top, st; |
885 |
char buf[_POSIX_PATH_MAX]; |
886 |
size_t pathlen = 0, len = 0; |
887 |
|
888 |
/* make sure path exists */ |
889 |
if (lstat(path, &st_top) == -1) { |
890 |
if (be_verbose > 2) printf("%s: does not exist\n", path); |
891 |
return; |
892 |
} |
893 |
|
894 |
/* ok, if it isn't a directory, assume we can open it */ |
895 |
if (!S_ISDIR(st_top.st_mode)) { |
896 |
scanelf_file(path); |
897 |
return; |
898 |
} |
899 |
|
900 |
/* now scan the dir looking for fun stuff */ |
901 |
if ((dir = opendir(path)) == NULL) { |
902 |
warnf("could not opendir %s: %s", path, strerror(errno)); |
903 |
return; |
904 |
} |
905 |
if (be_verbose) printf("%s: scanning dir\n", path); |
906 |
|
907 |
pathlen = strlen(path); |
908 |
while ((dentry = readdir(dir))) { |
909 |
if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) |
910 |
continue; |
911 |
len = (pathlen + 1 + strlen(dentry->d_name) + 1); |
912 |
if (len >= sizeof(buf)) { |
913 |
warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, |
914 |
(unsigned long)len, (unsigned long)sizeof(buf)); |
915 |
continue; |
916 |
} |
917 |
sprintf(buf, "%s/%s", path, dentry->d_name); |
918 |
if (lstat(buf, &st) != -1) { |
919 |
if (S_ISREG(st.st_mode)) |
920 |
scanelf_file(buf); |
921 |
else if (dir_recurse && S_ISDIR(st.st_mode)) { |
922 |
if (dir_crossmount || (st_top.st_dev == st.st_dev)) |
923 |
scanelf_dir(buf); |
924 |
} |
925 |
} |
926 |
} |
927 |
closedir(dir); |
928 |
} |
929 |
|
930 |
static int scanelf_from_file(char *filename) |
931 |
{ |
932 |
FILE *fp = NULL; |
933 |
char *p; |
934 |
char path[_POSIX_PATH_MAX]; |
935 |
|
936 |
if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) |
937 |
fp = stdin; |
938 |
else if ((fp = fopen(filename, "r")) == NULL) |
939 |
return 1; |
940 |
|
941 |
while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { |
942 |
if ((p = strchr(path, '\n')) != NULL) |
943 |
*p = 0; |
944 |
search_path = path; |
945 |
scanelf_dir(path); |
946 |
} |
947 |
if (fp != stdin) |
948 |
fclose(fp); |
949 |
return 0; |
950 |
} |
951 |
|
952 |
static void load_ld_so_conf() |
953 |
{ |
954 |
FILE *fp = NULL; |
955 |
char *p; |
956 |
char path[_POSIX_PATH_MAX]; |
957 |
int i = 0; |
958 |
|
959 |
if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) |
960 |
return; |
961 |
|
962 |
while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { |
963 |
if (*path != '/') |
964 |
continue; |
965 |
|
966 |
if ((p = strrchr(path, '\r')) != NULL) |
967 |
*p = 0; |
968 |
if ((p = strchr(path, '\n')) != NULL) |
969 |
*p = 0; |
970 |
|
971 |
ldpaths[i++] = xstrdup(path); |
972 |
|
973 |
if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) |
974 |
break; |
975 |
} |
976 |
ldpaths[i] = NULL; |
977 |
|
978 |
fclose(fp); |
979 |
} |
980 |
|
981 |
/* scan /etc/ld.so.conf for paths */ |
982 |
static void scanelf_ldpath() |
983 |
{ |
984 |
char scan_l, scan_ul, scan_ull; |
985 |
int i = 0; |
986 |
|
987 |
if (!ldpaths[0]) |
988 |
err("Unable to load any paths from ld.so.conf"); |
989 |
|
990 |
scan_l = scan_ul = scan_ull = 0; |
991 |
|
992 |
while (ldpaths[i]) { |
993 |
if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; |
994 |
if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; |
995 |
if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; |
996 |
scanelf_dir(ldpaths[i]); |
997 |
++i; |
998 |
} |
999 |
|
1000 |
if (!scan_l) scanelf_dir("/lib"); |
1001 |
if (!scan_ul) scanelf_dir("/usr/lib"); |
1002 |
if (!scan_ull) scanelf_dir("/usr/local/lib"); |
1003 |
} |
1004 |
|
1005 |
/* scan env PATH for paths */ |
1006 |
static void scanelf_envpath() |
1007 |
{ |
1008 |
char *path, *p; |
1009 |
|
1010 |
path = getenv("PATH"); |
1011 |
if (!path) |
1012 |
err("PATH is not set in your env !"); |
1013 |
path = xstrdup(path); |
1014 |
|
1015 |
while ((p = strrchr(path, ':')) != NULL) { |
1016 |
scanelf_dir(p + 1); |
1017 |
*p = 0; |
1018 |
} |
1019 |
|
1020 |
free(path); |
1021 |
} |
1022 |
|
1023 |
|
1024 |
|
1025 |
/* usage / invocation handling functions */ |
1026 |
#define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV" |
1027 |
#define a_argument required_argument |
1028 |
static struct option const long_opts[] = { |
1029 |
{"path", no_argument, NULL, 'p'}, |
1030 |
{"ldpath", no_argument, NULL, 'l'}, |
1031 |
{"recursive", no_argument, NULL, 'R'}, |
1032 |
{"mount", no_argument, NULL, 'm'}, |
1033 |
{"symlink", no_argument, NULL, 'y'}, |
1034 |
{"pax", no_argument, NULL, 'x'}, |
1035 |
{"header", no_argument, NULL, 'e'}, |
1036 |
{"textrel", no_argument, NULL, 't'}, |
1037 |
{"rpath", no_argument, NULL, 'r'}, |
1038 |
{"needed", no_argument, NULL, 'n'}, |
1039 |
{"interp", no_argument, NULL, 'i'}, |
1040 |
{"bind", no_argument, NULL, 'b'}, |
1041 |
{"soname", no_argument, NULL, 'S'}, |
1042 |
{"symbol", a_argument, NULL, 's'}, |
1043 |
{"lib", a_argument, NULL, 'N'}, |
1044 |
{"gmatch", no_argument, NULL, 'g'}, |
1045 |
{"textrels", no_argument, NULL, 'T'}, |
1046 |
{"all", no_argument, NULL, 'a'}, |
1047 |
{"quiet", no_argument, NULL, 'q'}, |
1048 |
{"verbose", no_argument, NULL, 'v'}, |
1049 |
{"format", a_argument, NULL, 'F'}, |
1050 |
{"from", a_argument, NULL, 'f'}, |
1051 |
{"file", a_argument, NULL, 'o'}, |
1052 |
{"nobanner", no_argument, NULL, 'B'}, |
1053 |
{"help", no_argument, NULL, 'h'}, |
1054 |
{"version", no_argument, NULL, 'V'}, |
1055 |
{NULL, no_argument, NULL, 0x0} |
1056 |
}; |
1057 |
|
1058 |
static const char *opts_help[] = { |
1059 |
"Scan all directories in PATH environment", |
1060 |
"Scan all directories in /etc/ld.so.conf", |
1061 |
"Scan directories recursively", |
1062 |
"Don't recursively cross mount points", |
1063 |
"Don't scan symlinks\n", |
1064 |
"Print PaX markings", |
1065 |
"Print GNU_STACK/PT_LOAD markings", |
1066 |
"Print TEXTREL information", |
1067 |
"Print RPATH information", |
1068 |
"Print NEEDED information", |
1069 |
"Print INTERP information", |
1070 |
"Print BIND information", |
1071 |
"Print SONAME information", |
1072 |
"Find a specified symbol", |
1073 |
"Find a specified library", |
1074 |
"Use strncmp to match libraries. (use with -N)", |
1075 |
"Locate cause of TEXTREL", |
1076 |
"Print all scanned info (-x -e -t -r -b)\n", |
1077 |
"Only output 'bad' things", |
1078 |
"Be verbose (can be specified more than once)", |
1079 |
"Use specified format for output", |
1080 |
"Read input stream from a filename", |
1081 |
"Write output stream to a filename", |
1082 |
"Don't display the header", |
1083 |
"Print this help and exit", |
1084 |
"Print version and exit", |
1085 |
NULL |
1086 |
}; |
1087 |
|
1088 |
/* display usage and exit */ |
1089 |
static void usage(int status) |
1090 |
{ |
1091 |
unsigned long i; |
1092 |
printf("* Scan ELF binaries for stuff\n\n" |
1093 |
"Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); |
1094 |
printf("Options: -[%s]\n", PARSE_FLAGS); |
1095 |
for (i = 0; long_opts[i].name; ++i) |
1096 |
if (long_opts[i].has_arg == no_argument) |
1097 |
printf(" -%c, --%-13s* %s\n", long_opts[i].val, |
1098 |
long_opts[i].name, opts_help[i]); |
1099 |
else |
1100 |
printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, |
1101 |
long_opts[i].name, opts_help[i]); |
1102 |
|
1103 |
if (status != EXIT_SUCCESS) |
1104 |
exit(status); |
1105 |
|
1106 |
puts("\nThe format modifiers for the -F option are:"); |
1107 |
puts(" F Filename \tx PaX Flags \te STACK/RELRO"); |
1108 |
puts(" t TEXTREL \tr RPATH \tn NEEDED"); |
1109 |
puts(" i INTERP \tb BIND \ts symbol"); |
1110 |
puts(" N library \to Type \tT TEXTRELs"); |
1111 |
puts(" S SONAME"); |
1112 |
puts(" p filename (with search path removed)"); |
1113 |
puts(" f filename (short name/basename)"); |
1114 |
puts("Prefix each modifier with '%' (verbose) or '#' (silent)"); |
1115 |
|
1116 |
exit(status); |
1117 |
} |
1118 |
|
1119 |
/* parse command line arguments and preform needed actions */ |
1120 |
static void parseargs(int argc, char *argv[]) |
1121 |
{ |
1122 |
int i; |
1123 |
char *from_file = NULL; |
1124 |
|
1125 |
opterr = 0; |
1126 |
while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { |
1127 |
switch (i) { |
1128 |
|
1129 |
case 'V': |
1130 |
printf("pax-utils-%s: %s compiled %s\n%s\n" |
1131 |
"%s written for Gentoo by <solar and vapier @ gentoo.org>\n", |
1132 |
VERSION, __FILE__, __DATE__, rcsid, argv0); |
1133 |
exit(EXIT_SUCCESS); |
1134 |
break; |
1135 |
case 'h': usage(EXIT_SUCCESS); break; |
1136 |
case 'f': |
1137 |
if (from_file) err("Don't specify -f twice"); |
1138 |
from_file = xstrdup(optarg); |
1139 |
break; |
1140 |
case 'o': { |
1141 |
FILE *fp = NULL; |
1142 |
if ((fp = freopen(optarg, "w", stdout)) == NULL) |
1143 |
err("Could not open output stream '%s': %s", optarg, strerror(errno)); |
1144 |
SET_STDOUT(fp); |
1145 |
break; |
1146 |
} |
1147 |
|
1148 |
case 's': { |
1149 |
if (find_sym) warn("You prob don't want to specify -s twice"); |
1150 |
find_sym = optarg; |
1151 |
versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1)); |
1152 |
sprintf(versioned_symname, "%s@", find_sym); |
1153 |
break; |
1154 |
} |
1155 |
case 'N': { |
1156 |
if (find_lib) warn("You prob don't want to specify -N twice"); |
1157 |
find_lib = optarg; |
1158 |
break; |
1159 |
} |
1160 |
|
1161 |
case 'F': { |
1162 |
if (out_format) warn("You prob don't want to specify -F twice"); |
1163 |
out_format = optarg; |
1164 |
break; |
1165 |
} |
1166 |
|
1167 |
case 'g': gmatch = 1; |
1168 |
case 'y': scan_symlink = 0; break; |
1169 |
case 'B': show_banner = 0; break; |
1170 |
case 'l': scan_ldpath = 1; break; |
1171 |
case 'p': scan_envpath = 1; break; |
1172 |
case 'R': dir_recurse = 1; break; |
1173 |
case 'm': dir_crossmount = 0; break; |
1174 |
case 'x': show_pax = 1; break; |
1175 |
case 'e': show_phdr = 1; break; |
1176 |
case 't': show_textrel = 1; break; |
1177 |
case 'r': show_rpath = 1; break; |
1178 |
case 'n': show_needed = 1; break; |
1179 |
case 'i': show_interp = 1; break; |
1180 |
case 'b': show_bind = 1; break; |
1181 |
case 'S': show_soname = 1; break; |
1182 |
case 'T': show_textrels = 1; break; |
1183 |
case 'q': be_quiet = 1; break; |
1184 |
case 'v': be_verbose = (be_verbose % 20) + 1; break; |
1185 |
case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break; |
1186 |
|
1187 |
case ':': |
1188 |
err("Option missing parameter\n"); |
1189 |
case '?': |
1190 |
err("Unknown option\n"); |
1191 |
default: |
1192 |
err("Unhandled option '%c'", i); |
1193 |
} |
1194 |
} |
1195 |
|
1196 |
/* let the format option override all other options */ |
1197 |
if (out_format) { |
1198 |
show_pax = show_phdr = show_textrel = show_rpath = \ |
1199 |
show_needed = show_interp = show_bind = show_soname = \ |
1200 |
show_textrels = 0; |
1201 |
for (i = 0; out_format[i]; ++i) { |
1202 |
if (!IS_MODIFIER(out_format[i])) continue; |
1203 |
|
1204 |
switch (out_format[++i]) { |
1205 |
case '%': break; |
1206 |
case '#': break; |
1207 |
case 'F': break; |
1208 |
case 'p': break; |
1209 |
case 'f': break; |
1210 |
case 's': break; |
1211 |
case 'N': break; |
1212 |
case 'o': break; |
1213 |
case 'x': show_pax = 1; break; |
1214 |
case 'e': show_phdr = 1; break; |
1215 |
case 't': show_textrel = 1; break; |
1216 |
case 'r': show_rpath = 1; break; |
1217 |
case 'n': show_needed = 1; break; |
1218 |
case 'i': show_interp = 1; break; |
1219 |
case 'b': show_bind = 1; break; |
1220 |
case 'S': show_soname = 1; break; |
1221 |
case 'T': show_textrels = 1; break; |
1222 |
default: |
1223 |
err("Invalid format specifier '%c' (byte %i)", |
1224 |
out_format[i], i+1); |
1225 |
} |
1226 |
} |
1227 |
|
1228 |
/* construct our default format */ |
1229 |
} else { |
1230 |
size_t fmt_len = 30; |
1231 |
out_format = (char*)xmalloc(sizeof(char) * fmt_len); |
1232 |
if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); |
1233 |
if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); |
1234 |
if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len); |
1235 |
if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); |
1236 |
if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); |
1237 |
if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); |
1238 |
if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); |
1239 |
if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); |
1240 |
if (show_soname) xstrcat(&out_format, "%S ", &fmt_len); |
1241 |
if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len); |
1242 |
if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); |
1243 |
if (find_lib) xstrcat(&out_format, "%N ", &fmt_len); |
1244 |
if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); |
1245 |
} |
1246 |
if (be_verbose > 2) printf("Format: %s\n", out_format); |
1247 |
|
1248 |
/* now lets actually do the scanning */ |
1249 |
if (scan_ldpath || (show_rpath && be_quiet)) |
1250 |
load_ld_so_conf(); |
1251 |
if (scan_ldpath) scanelf_ldpath(); |
1252 |
if (scan_envpath) scanelf_envpath(); |
1253 |
if (from_file) { |
1254 |
scanelf_from_file(from_file); |
1255 |
free(from_file); |
1256 |
from_file = *argv; |
1257 |
} |
1258 |
if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) |
1259 |
err("Nothing to scan !?"); |
1260 |
while (optind < argc) { |
1261 |
search_path = argv[optind++]; |
1262 |
scanelf_dir(search_path); |
1263 |
} |
1264 |
|
1265 |
/* clean up */ |
1266 |
if (versioned_symname) free(versioned_symname); |
1267 |
for (i = 0; ldpaths[i]; ++i) |
1268 |
free(ldpaths[i]); |
1269 |
} |
1270 |
|
1271 |
|
1272 |
|
1273 |
/* utility funcs */ |
1274 |
static char *xstrdup(const char *s) |
1275 |
{ |
1276 |
char *ret = strdup(s); |
1277 |
if (!ret) err("Could not strdup(): %s", strerror(errno)); |
1278 |
return ret; |
1279 |
} |
1280 |
static void *xmalloc(size_t size) |
1281 |
{ |
1282 |
void *ret = malloc(size); |
1283 |
if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); |
1284 |
return ret; |
1285 |
} |
1286 |
static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n) |
1287 |
{ |
1288 |
size_t new_len; |
1289 |
|
1290 |
new_len = strlen(*dst) + strlen(src); |
1291 |
if (*curr_len <= new_len) { |
1292 |
*curr_len = new_len + (*curr_len / 2); |
1293 |
*dst = realloc(*dst, *curr_len); |
1294 |
if (!*dst) |
1295 |
err("could not realloc() %li bytes", (unsigned long)*curr_len); |
1296 |
} |
1297 |
|
1298 |
if (n) |
1299 |
strncat(*dst, src, n); |
1300 |
else |
1301 |
strcat(*dst, src); |
1302 |
} |
1303 |
static inline void xchrcat(char **dst, const char append, size_t *curr_len) |
1304 |
{ |
1305 |
static char my_app[2]; |
1306 |
my_app[0] = append; |
1307 |
my_app[1] = '\0'; |
1308 |
xstrcat(dst, my_app, curr_len); |
1309 |
} |
1310 |
|
1311 |
|
1312 |
|
1313 |
int main(int argc, char *argv[]) |
1314 |
{ |
1315 |
if (argc < 2) |
1316 |
usage(EXIT_FAILURE); |
1317 |
parseargs(argc, argv); |
1318 |
fclose(stdout); |
1319 |
#ifdef __BOUNDS_CHECKING_ON |
1320 |
warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()"); |
1321 |
#endif |
1322 |
return EXIT_SUCCESS; |
1323 |
} |