| 1 |
/* |
| 2 |
* Copyright 2003-2005 Gentoo Foundation |
| 3 |
* Distributed under the terms of the GNU General Public License v2 |
| 4 |
* $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.93 2005/12/10 04:07:55 vapier Exp $ |
| 5 |
* |
| 6 |
* Copyright 2003-2005 Ned Ludd - <solar@gentoo.org> |
| 7 |
* Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org> |
| 8 |
*/ |
| 9 |
|
| 10 |
#include <stdio.h> |
| 11 |
#include <stdlib.h> |
| 12 |
#include <sys/types.h> |
| 13 |
#include <libgen.h> |
| 14 |
#include <limits.h> |
| 15 |
#include <string.h> |
| 16 |
#include <errno.h> |
| 17 |
#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; |
| 62 |
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; |
| 69 |
|
| 70 |
|
| 71 |
/* sub-funcs for scanelf_file() */ |
| 72 |
static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab) |
| 73 |
{ |
| 74 |
/* find the best SHT_DYNSYM and SHT_STRTAB sections */ |
| 75 |
#define GET_SYMTABS(B) \ |
| 76 |
if (elf->elf_class == ELFCLASS ## B) { \ |
| 77 |
Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \ |
| 78 |
/* debug sections */ \ |
| 79 |
symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \ |
| 80 |
strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \ |
| 81 |
/* runtime sections */ \ |
| 82 |
dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \ |
| 83 |
dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \ |
| 84 |
if (symtab && dynsym) { \ |
| 85 |
*sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \ |
| 86 |
} else { \ |
| 87 |
*sym = (void*)(symtab ? symtab : dynsym); \ |
| 88 |
} \ |
| 89 |
if (strtab && dynstr) { \ |
| 90 |
*tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \ |
| 91 |
} else { \ |
| 92 |
*tab = (void*)(strtab ? strtab : dynstr); \ |
| 93 |
} \ |
| 94 |
} |
| 95 |
GET_SYMTABS(32) |
| 96 |
GET_SYMTABS(64) |
| 97 |
} |
| 98 |
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) \ |
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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); \ |
| 119 |
*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 |
| 142 |
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 |
} |
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