1 /* 2 * Copyright (c) Christos Zoulas 2003. 3 * All Rights Reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice immediately at the beginning of the file, without modification, 10 * this list of conditions, and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 #include "file.h" 28 29 #ifndef lint 30 FILE_RCSID("@(#)$File: readelf.c,v 1.117 2014/12/16 23:29:42 christos Exp $") 31 #endif 32 33 #ifdef BUILTIN_ELF 34 #include <string.h> 35 #include <ctype.h> 36 #include <stdlib.h> 37 #ifdef HAVE_UNISTD_H 38 #include <unistd.h> 39 #endif 40 41 #include "readelf.h" 42 #include "magic.h" 43 44 #ifdef ELFCORE 45 private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t, 46 off_t, int *, uint16_t *); 47 #endif 48 private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t, 49 off_t, int, int *, uint16_t *); 50 private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, 51 off_t, int, int, int *, uint16_t *); 52 private size_t donote(struct magic_set *, void *, size_t, size_t, int, 53 int, size_t, int *, uint16_t *); 54 55 #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) 56 57 #define isquote(c) (strchr("'\"`", (c)) != NULL) 58 59 private uint16_t getu16(int, uint16_t); 60 private uint32_t getu32(int, uint32_t); 61 private uint64_t getu64(int, uint64_t); 62 63 #define MAX_PHNUM 128 64 #define MAX_SHNUM 32768 65 #define SIZE_UNKNOWN ((off_t)-1) 66 67 private int 68 toomany(struct magic_set *ms, const char *name, uint16_t num) 69 { 70 if (file_printf(ms, ", too many %s (%u)", name, num 71 ) == -1) 72 return -1; 73 return 0; 74 } 75 76 private uint16_t 77 getu16(int swap, uint16_t value) 78 { 79 union { 80 uint16_t ui; 81 char c[2]; 82 } retval, tmpval; 83 84 if (swap) { 85 tmpval.ui = value; 86 87 retval.c[0] = tmpval.c[1]; 88 retval.c[1] = tmpval.c[0]; 89 90 return retval.ui; 91 } else 92 return value; 93 } 94 95 private uint32_t 96 getu32(int swap, uint32_t value) 97 { 98 union { 99 uint32_t ui; 100 char c[4]; 101 } retval, tmpval; 102 103 if (swap) { 104 tmpval.ui = value; 105 106 retval.c[0] = tmpval.c[3]; 107 retval.c[1] = tmpval.c[2]; 108 retval.c[2] = tmpval.c[1]; 109 retval.c[3] = tmpval.c[0]; 110 111 return retval.ui; 112 } else 113 return value; 114 } 115 116 private uint64_t 117 getu64(int swap, uint64_t value) 118 { 119 union { 120 uint64_t ui; 121 char c[8]; 122 } retval, tmpval; 123 124 if (swap) { 125 tmpval.ui = value; 126 127 retval.c[0] = tmpval.c[7]; 128 retval.c[1] = tmpval.c[6]; 129 retval.c[2] = tmpval.c[5]; 130 retval.c[3] = tmpval.c[4]; 131 retval.c[4] = tmpval.c[3]; 132 retval.c[5] = tmpval.c[2]; 133 retval.c[6] = tmpval.c[1]; 134 retval.c[7] = tmpval.c[0]; 135 136 return retval.ui; 137 } else 138 return value; 139 } 140 141 #define elf_getu16(swap, value) getu16(swap, value) 142 #define elf_getu32(swap, value) getu32(swap, value) 143 #define elf_getu64(swap, value) getu64(swap, value) 144 145 #define xsh_addr (clazz == ELFCLASS32 \ 146 ? (void *)&sh32 \ 147 : (void *)&sh64) 148 #define xsh_sizeof (clazz == ELFCLASS32 \ 149 ? sizeof(sh32) \ 150 : sizeof(sh64)) 151 #define xsh_size (size_t)(clazz == ELFCLASS32 \ 152 ? elf_getu32(swap, sh32.sh_size) \ 153 : elf_getu64(swap, sh64.sh_size)) 154 #define xsh_offset (off_t)(clazz == ELFCLASS32 \ 155 ? elf_getu32(swap, sh32.sh_offset) \ 156 : elf_getu64(swap, sh64.sh_offset)) 157 #define xsh_type (clazz == ELFCLASS32 \ 158 ? elf_getu32(swap, sh32.sh_type) \ 159 : elf_getu32(swap, sh64.sh_type)) 160 #define xsh_name (clazz == ELFCLASS32 \ 161 ? elf_getu32(swap, sh32.sh_name) \ 162 : elf_getu32(swap, sh64.sh_name)) 163 #define xph_addr (clazz == ELFCLASS32 \ 164 ? (void *) &ph32 \ 165 : (void *) &ph64) 166 #define xph_sizeof (clazz == ELFCLASS32 \ 167 ? sizeof(ph32) \ 168 : sizeof(ph64)) 169 #define xph_type (clazz == ELFCLASS32 \ 170 ? elf_getu32(swap, ph32.p_type) \ 171 : elf_getu32(swap, ph64.p_type)) 172 #define xph_offset (off_t)(clazz == ELFCLASS32 \ 173 ? elf_getu32(swap, ph32.p_offset) \ 174 : elf_getu64(swap, ph64.p_offset)) 175 #define xph_align (size_t)((clazz == ELFCLASS32 \ 176 ? (off_t) (ph32.p_align ? \ 177 elf_getu32(swap, ph32.p_align) : 4) \ 178 : (off_t) (ph64.p_align ? \ 179 elf_getu64(swap, ph64.p_align) : 4))) 180 #define xph_filesz (size_t)((clazz == ELFCLASS32 \ 181 ? elf_getu32(swap, ph32.p_filesz) \ 182 : elf_getu64(swap, ph64.p_filesz))) 183 #define xnh_addr (clazz == ELFCLASS32 \ 184 ? (void *)&nh32 \ 185 : (void *)&nh64) 186 #define xph_memsz (size_t)((clazz == ELFCLASS32 \ 187 ? elf_getu32(swap, ph32.p_memsz) \ 188 : elf_getu64(swap, ph64.p_memsz))) 189 #define xnh_sizeof (clazz == ELFCLASS32 \ 190 ? sizeof nh32 \ 191 : sizeof nh64) 192 #define xnh_type (clazz == ELFCLASS32 \ 193 ? elf_getu32(swap, nh32.n_type) \ 194 : elf_getu32(swap, nh64.n_type)) 195 #define xnh_namesz (clazz == ELFCLASS32 \ 196 ? elf_getu32(swap, nh32.n_namesz) \ 197 : elf_getu32(swap, nh64.n_namesz)) 198 #define xnh_descsz (clazz == ELFCLASS32 \ 199 ? elf_getu32(swap, nh32.n_descsz) \ 200 : elf_getu32(swap, nh64.n_descsz)) 201 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 202 ? prpsoffsets32[i] \ 203 : prpsoffsets64[i]) 204 #define xcap_addr (clazz == ELFCLASS32 \ 205 ? (void *)&cap32 \ 206 : (void *)&cap64) 207 #define xcap_sizeof (clazz == ELFCLASS32 \ 208 ? sizeof cap32 \ 209 : sizeof cap64) 210 #define xcap_tag (clazz == ELFCLASS32 \ 211 ? elf_getu32(swap, cap32.c_tag) \ 212 : elf_getu64(swap, cap64.c_tag)) 213 #define xcap_val (clazz == ELFCLASS32 \ 214 ? elf_getu32(swap, cap32.c_un.c_val) \ 215 : elf_getu64(swap, cap64.c_un.c_val)) 216 217 #ifdef ELFCORE 218 /* 219 * Try larger offsets first to avoid false matches 220 * from earlier data that happen to look like strings. 221 */ 222 static const size_t prpsoffsets32[] = { 223 #ifdef USE_NT_PSINFO 224 104, /* SunOS 5.x (command line) */ 225 88, /* SunOS 5.x (short name) */ 226 #endif /* USE_NT_PSINFO */ 227 228 100, /* SunOS 5.x (command line) */ 229 84, /* SunOS 5.x (short name) */ 230 231 44, /* Linux (command line) */ 232 28, /* Linux 2.0.36 (short name) */ 233 234 8, /* FreeBSD */ 235 }; 236 237 static const size_t prpsoffsets64[] = { 238 #ifdef USE_NT_PSINFO 239 152, /* SunOS 5.x (command line) */ 240 136, /* SunOS 5.x (short name) */ 241 #endif /* USE_NT_PSINFO */ 242 243 136, /* SunOS 5.x, 64-bit (command line) */ 244 120, /* SunOS 5.x, 64-bit (short name) */ 245 246 56, /* Linux (command line) */ 247 40, /* Linux (tested on core from 2.4.x, short name) */ 248 249 16, /* FreeBSD, 64-bit */ 250 }; 251 252 #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0]) 253 #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0]) 254 255 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 256 257 /* 258 * Look through the program headers of an executable image, searching 259 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 260 * "FreeBSD"; if one is found, try looking in various places in its 261 * contents for a 16-character string containing only printable 262 * characters - if found, that string should be the name of the program 263 * that dropped core. Note: right after that 16-character string is, 264 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 265 * Linux, a longer string (80 characters, in 5.x, probably other 266 * SVR4-flavored systems, and Linux) containing the start of the 267 * command line for that program. 268 * 269 * SunOS 5.x core files contain two PT_NOTE sections, with the types 270 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 271 * same info about the command name and command line, so it probably 272 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 273 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 274 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 275 * the SunOS 5.x file command relies on this (and prefers the latter). 276 * 277 * The signal number probably appears in a section of type NT_PRSTATUS, 278 * but that's also rather OS-dependent, in ways that are harder to 279 * dissect with heuristics, so I'm not bothering with the signal number. 280 * (I suppose the signal number could be of interest in situations where 281 * you don't have the binary of the program that dropped core; if you 282 * *do* have that binary, the debugger will probably tell you what 283 * signal it was.) 284 */ 285 286 #define OS_STYLE_SVR4 0 287 #define OS_STYLE_FREEBSD 1 288 #define OS_STYLE_NETBSD 2 289 290 private const char os_style_names[][8] = { 291 "SVR4", 292 "FreeBSD", 293 "NetBSD", 294 }; 295 296 #define FLAGS_DID_CORE 0x001 297 #define FLAGS_DID_OS_NOTE 0x002 298 #define FLAGS_DID_BUILD_ID 0x004 299 #define FLAGS_DID_CORE_STYLE 0x008 300 #define FLAGS_DID_NETBSD_PAX 0x010 301 #define FLAGS_DID_NETBSD_MARCH 0x020 302 #define FLAGS_DID_NETBSD_CMODEL 0x040 303 #define FLAGS_DID_NETBSD_UNKNOWN 0x080 304 #define FLAGS_IS_CORE 0x100 305 306 private int 307 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 308 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 309 { 310 Elf32_Phdr ph32; 311 Elf64_Phdr ph64; 312 size_t offset, len; 313 unsigned char nbuf[BUFSIZ]; 314 ssize_t bufsize; 315 316 if (size != xph_sizeof) { 317 if (file_printf(ms, ", corrupted program header size") == -1) 318 return -1; 319 return 0; 320 } 321 322 /* 323 * Loop through all the program headers. 324 */ 325 for ( ; num; num--) { 326 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 327 file_badread(ms); 328 return -1; 329 } 330 off += size; 331 332 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 333 /* Perhaps warn here */ 334 continue; 335 } 336 337 if (xph_type != PT_NOTE) 338 continue; 339 340 /* 341 * This is a PT_NOTE section; loop through all the notes 342 * in the section. 343 */ 344 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 345 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) { 346 file_badread(ms); 347 return -1; 348 } 349 offset = 0; 350 for (;;) { 351 if (offset >= (size_t)bufsize) 352 break; 353 offset = donote(ms, nbuf, offset, (size_t)bufsize, 354 clazz, swap, 4, flags, notecount); 355 if (offset == 0) 356 break; 357 358 } 359 } 360 return 0; 361 } 362 #endif 363 364 static void 365 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 366 { 367 uint32_t desc; 368 (void)memcpy(&desc, v, sizeof(desc)); 369 desc = elf_getu32(swap, desc); 370 371 if (file_printf(ms, ", for NetBSD") == -1) 372 return; 373 /* 374 * The version number used to be stuck as 199905, and was thus 375 * basically content-free. Newer versions of NetBSD have fixed 376 * this and now use the encoding of __NetBSD_Version__: 377 * 378 * MMmmrrpp00 379 * 380 * M = major version 381 * m = minor version 382 * r = release ["",A-Z,Z[A-Z] but numeric] 383 * p = patchlevel 384 */ 385 if (desc > 100000000U) { 386 uint32_t ver_patch = (desc / 100) % 100; 387 uint32_t ver_rel = (desc / 10000) % 100; 388 uint32_t ver_min = (desc / 1000000) % 100; 389 uint32_t ver_maj = desc / 100000000; 390 391 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 392 return; 393 if (ver_rel == 0 && ver_patch != 0) { 394 if (file_printf(ms, ".%u", ver_patch) == -1) 395 return; 396 } else if (ver_rel != 0) { 397 while (ver_rel > 26) { 398 if (file_printf(ms, "Z") == -1) 399 return; 400 ver_rel -= 26; 401 } 402 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 403 == -1) 404 return; 405 } 406 } 407 } 408 409 static void 410 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 411 { 412 uint32_t desc; 413 414 (void)memcpy(&desc, v, sizeof(desc)); 415 desc = elf_getu32(swap, desc); 416 if (file_printf(ms, ", for FreeBSD") == -1) 417 return; 418 419 /* 420 * Contents is __FreeBSD_version, whose relation to OS 421 * versions is defined by a huge table in the Porter's 422 * Handbook. This is the general scheme: 423 * 424 * Releases: 425 * Mmp000 (before 4.10) 426 * Mmi0p0 (before 5.0) 427 * Mmm0p0 428 * 429 * Development branches: 430 * Mmpxxx (before 4.6) 431 * Mmp1xx (before 4.10) 432 * Mmi1xx (before 5.0) 433 * M000xx (pre-M.0) 434 * Mmm1xx 435 * 436 * M = major version 437 * m = minor version 438 * i = minor version increment (491000 -> 4.10) 439 * p = patchlevel 440 * x = revision 441 * 442 * The first release of FreeBSD to use ELF by default 443 * was version 3.0. 444 */ 445 if (desc == 460002) { 446 if (file_printf(ms, " 4.6.2") == -1) 447 return; 448 } else if (desc < 460100) { 449 if (file_printf(ms, " %d.%d", desc / 100000, 450 desc / 10000 % 10) == -1) 451 return; 452 if (desc / 1000 % 10 > 0) 453 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 454 return; 455 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 456 if (file_printf(ms, " (%d)", desc) == -1) 457 return; 458 } else if (desc < 500000) { 459 if (file_printf(ms, " %d.%d", desc / 100000, 460 desc / 10000 % 10 + desc / 1000 % 10) == -1) 461 return; 462 if (desc / 100 % 10 > 0) { 463 if (file_printf(ms, " (%d)", desc) == -1) 464 return; 465 } else if (desc / 10 % 10 > 0) { 466 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 467 return; 468 } 469 } else { 470 if (file_printf(ms, " %d.%d", desc / 100000, 471 desc / 1000 % 100) == -1) 472 return; 473 if ((desc / 100 % 10 > 0) || 474 (desc % 100000 / 100 == 0)) { 475 if (file_printf(ms, " (%d)", desc) == -1) 476 return; 477 } else if (desc / 10 % 10 > 0) { 478 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 479 return; 480 } 481 } 482 } 483 484 private int 485 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 486 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 487 size_t noff, size_t doff, int *flags) 488 { 489 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 490 type == NT_GNU_BUILD_ID && (descsz == 16 || descsz == 20)) { 491 uint8_t desc[20]; 492 uint32_t i; 493 *flags |= FLAGS_DID_BUILD_ID; 494 if (file_printf(ms, ", BuildID[%s]=", descsz == 16 ? "md5/uuid" : 495 "sha1") == -1) 496 return 1; 497 (void)memcpy(desc, &nbuf[doff], descsz); 498 for (i = 0; i < descsz; i++) 499 if (file_printf(ms, "%02x", desc[i]) == -1) 500 return 1; 501 return 1; 502 } 503 return 0; 504 } 505 506 private int 507 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 508 int swap, uint32_t namesz, uint32_t descsz, 509 size_t noff, size_t doff, int *flags) 510 { 511 if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 && 512 type == NT_GNU_VERSION && descsz == 2) { 513 *flags |= FLAGS_DID_OS_NOTE; 514 file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]); 515 return 1; 516 } 517 518 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 519 type == NT_GNU_VERSION && descsz == 16) { 520 uint32_t desc[4]; 521 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 522 523 *flags |= FLAGS_DID_OS_NOTE; 524 if (file_printf(ms, ", for GNU/") == -1) 525 return 1; 526 switch (elf_getu32(swap, desc[0])) { 527 case GNU_OS_LINUX: 528 if (file_printf(ms, "Linux") == -1) 529 return 1; 530 break; 531 case GNU_OS_HURD: 532 if (file_printf(ms, "Hurd") == -1) 533 return 1; 534 break; 535 case GNU_OS_SOLARIS: 536 if (file_printf(ms, "Solaris") == -1) 537 return 1; 538 break; 539 case GNU_OS_KFREEBSD: 540 if (file_printf(ms, "kFreeBSD") == -1) 541 return 1; 542 break; 543 case GNU_OS_KNETBSD: 544 if (file_printf(ms, "kNetBSD") == -1) 545 return 1; 546 break; 547 default: 548 if (file_printf(ms, "<unknown>") == -1) 549 return 1; 550 } 551 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 552 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 553 return 1; 554 return 1; 555 } 556 557 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 558 if (type == NT_NETBSD_VERSION && descsz == 4) { 559 *flags |= FLAGS_DID_OS_NOTE; 560 do_note_netbsd_version(ms, swap, &nbuf[doff]); 561 return 1; 562 } 563 } 564 565 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) { 566 if (type == NT_FREEBSD_VERSION && descsz == 4) { 567 *flags |= FLAGS_DID_OS_NOTE; 568 do_note_freebsd_version(ms, swap, &nbuf[doff]); 569 return 1; 570 } 571 } 572 573 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && 574 type == NT_OPENBSD_VERSION && descsz == 4) { 575 *flags |= FLAGS_DID_OS_NOTE; 576 if (file_printf(ms, ", for OpenBSD") == -1) 577 return 1; 578 /* Content of note is always 0 */ 579 return 1; 580 } 581 582 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && 583 type == NT_DRAGONFLY_VERSION && descsz == 4) { 584 uint32_t desc; 585 *flags |= FLAGS_DID_OS_NOTE; 586 if (file_printf(ms, ", for DragonFly") == -1) 587 return 1; 588 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 589 desc = elf_getu32(swap, desc); 590 if (file_printf(ms, " %d.%d.%d", desc / 100000, 591 desc / 10000 % 10, desc % 10000) == -1) 592 return 1; 593 return 1; 594 } 595 return 0; 596 } 597 598 private int 599 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 600 int swap, uint32_t namesz, uint32_t descsz, 601 size_t noff, size_t doff, int *flags) 602 { 603 if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 && 604 type == NT_NETBSD_PAX && descsz == 4) { 605 static const char *pax[] = { 606 "+mprotect", 607 "-mprotect", 608 "+segvguard", 609 "-segvguard", 610 "+ASLR", 611 "-ASLR", 612 }; 613 uint32_t desc; 614 size_t i; 615 int did = 0; 616 617 *flags |= FLAGS_DID_NETBSD_PAX; 618 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 619 desc = elf_getu32(swap, desc); 620 621 if (desc && file_printf(ms, ", PaX: ") == -1) 622 return 1; 623 624 for (i = 0; i < __arraycount(pax); i++) { 625 if (((1 << i) & desc) == 0) 626 continue; 627 if (file_printf(ms, "%s%s", did++ ? "," : "", 628 pax[i]) == -1) 629 return 1; 630 } 631 return 1; 632 } 633 return 0; 634 } 635 636 private int 637 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 638 int swap, uint32_t namesz, uint32_t descsz, 639 size_t noff, size_t doff, int *flags, size_t size, int clazz) 640 { 641 #ifdef ELFCORE 642 int os_style = -1; 643 /* 644 * Sigh. The 2.0.36 kernel in Debian 2.1, at 645 * least, doesn't correctly implement name 646 * sections, in core dumps, as specified by 647 * the "Program Linking" section of "UNIX(R) System 648 * V Release 4 Programmer's Guide: ANSI C and 649 * Programming Support Tools", because my copy 650 * clearly says "The first 'namesz' bytes in 'name' 651 * contain a *null-terminated* [emphasis mine] 652 * character representation of the entry's owner 653 * or originator", but the 2.0.36 kernel code 654 * doesn't include the terminating null in the 655 * name.... 656 */ 657 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || 658 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { 659 os_style = OS_STYLE_SVR4; 660 } 661 662 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { 663 os_style = OS_STYLE_FREEBSD; 664 } 665 666 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) 667 == 0)) { 668 os_style = OS_STYLE_NETBSD; 669 } 670 671 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 672 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 673 == -1) 674 return 1; 675 *flags |= FLAGS_DID_CORE_STYLE; 676 } 677 678 switch (os_style) { 679 case OS_STYLE_NETBSD: 680 if (type == NT_NETBSD_CORE_PROCINFO) { 681 char sbuf[512]; 682 uint32_t signo; 683 /* 684 * Extract the program name. It is at 685 * offset 0x7c, and is up to 32-bytes, 686 * including the terminating NUL. 687 */ 688 if (file_printf(ms, ", from '%.31s'", 689 file_printable(sbuf, sizeof(sbuf), 690 (const char *)&nbuf[doff + 0x7c])) == -1) 691 return 1; 692 693 /* 694 * Extract the signal number. It is at 695 * offset 0x08. 696 */ 697 (void)memcpy(&signo, &nbuf[doff + 0x08], 698 sizeof(signo)); 699 if (file_printf(ms, " (signal %u)", 700 elf_getu32(swap, signo)) == -1) 701 return 1; 702 *flags |= FLAGS_DID_CORE; 703 return 1; 704 } 705 break; 706 707 default: 708 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 709 size_t i, j; 710 unsigned char c; 711 /* 712 * Extract the program name. We assume 713 * it to be 16 characters (that's what it 714 * is in SunOS 5.x and Linux). 715 * 716 * Unfortunately, it's at a different offset 717 * in various OSes, so try multiple offsets. 718 * If the characters aren't all printable, 719 * reject it. 720 */ 721 for (i = 0; i < NOFFSETS; i++) { 722 unsigned char *cname, *cp; 723 size_t reloffset = prpsoffsets(i); 724 size_t noffset = doff + reloffset; 725 size_t k; 726 for (j = 0; j < 16; j++, noffset++, 727 reloffset++) { 728 /* 729 * Make sure we're not past 730 * the end of the buffer; if 731 * we are, just give up. 732 */ 733 if (noffset >= size) 734 goto tryanother; 735 736 /* 737 * Make sure we're not past 738 * the end of the contents; 739 * if we are, this obviously 740 * isn't the right offset. 741 */ 742 if (reloffset >= descsz) 743 goto tryanother; 744 745 c = nbuf[noffset]; 746 if (c == '\0') { 747 /* 748 * A '\0' at the 749 * beginning is 750 * obviously wrong. 751 * Any other '\0' 752 * means we're done. 753 */ 754 if (j == 0) 755 goto tryanother; 756 else 757 break; 758 } else { 759 /* 760 * A nonprintable 761 * character is also 762 * wrong. 763 */ 764 if (!isprint(c) || isquote(c)) 765 goto tryanother; 766 } 767 } 768 /* 769 * Well, that worked. 770 */ 771 772 /* 773 * Try next offsets, in case this match is 774 * in the middle of a string. 775 */ 776 for (k = i + 1 ; k < NOFFSETS; k++) { 777 size_t no; 778 int adjust = 1; 779 if (prpsoffsets(k) >= prpsoffsets(i)) 780 continue; 781 for (no = doff + prpsoffsets(k); 782 no < doff + prpsoffsets(i); no++) 783 adjust = adjust 784 && isprint(nbuf[no]); 785 if (adjust) 786 i = k; 787 } 788 789 cname = (unsigned char *) 790 &nbuf[doff + prpsoffsets(i)]; 791 for (cp = cname; *cp && isprint(*cp); cp++) 792 continue; 793 /* 794 * Linux apparently appends a space at the end 795 * of the command line: remove it. 796 */ 797 while (cp > cname && isspace(cp[-1])) 798 cp--; 799 if (file_printf(ms, ", from '%.*s'", 800 (int)(cp - cname), cname) == -1) 801 return 1; 802 *flags |= FLAGS_DID_CORE; 803 return 1; 804 805 tryanother: 806 ; 807 } 808 } 809 break; 810 } 811 #endif 812 return 0; 813 } 814 815 private size_t 816 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 817 int clazz, int swap, size_t align, int *flags, uint16_t *notecount) 818 { 819 Elf32_Nhdr nh32; 820 Elf64_Nhdr nh64; 821 size_t noff, doff; 822 uint32_t namesz, descsz; 823 unsigned char *nbuf = CAST(unsigned char *, vbuf); 824 825 if (*notecount == 0) 826 return 0; 827 --*notecount; 828 829 if (xnh_sizeof + offset > size) { 830 /* 831 * We're out of note headers. 832 */ 833 return xnh_sizeof + offset; 834 } 835 836 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 837 offset += xnh_sizeof; 838 839 namesz = xnh_namesz; 840 descsz = xnh_descsz; 841 if ((namesz == 0) && (descsz == 0)) { 842 /* 843 * We're out of note headers. 844 */ 845 return (offset >= size) ? offset : size; 846 } 847 848 if (namesz & 0x80000000) { 849 (void)file_printf(ms, ", bad note name size 0x%lx", 850 (unsigned long)namesz); 851 return 0; 852 } 853 854 if (descsz & 0x80000000) { 855 (void)file_printf(ms, ", bad note description size 0x%lx", 856 (unsigned long)descsz); 857 return 0; 858 } 859 860 noff = offset; 861 doff = ELF_ALIGN(offset + namesz); 862 863 if (offset + namesz > size) { 864 /* 865 * We're past the end of the buffer. 866 */ 867 return doff; 868 } 869 870 offset = ELF_ALIGN(doff + descsz); 871 if (doff + descsz > size) { 872 /* 873 * We're past the end of the buffer. 874 */ 875 return (offset >= size) ? offset : size; 876 } 877 878 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 879 if (do_os_note(ms, nbuf, xnh_type, swap, 880 namesz, descsz, noff, doff, flags)) 881 return size; 882 } 883 884 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 885 if (do_bid_note(ms, nbuf, xnh_type, swap, 886 namesz, descsz, noff, doff, flags)) 887 return size; 888 } 889 890 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 891 if (do_pax_note(ms, nbuf, xnh_type, swap, 892 namesz, descsz, noff, doff, flags)) 893 return size; 894 } 895 896 if ((*flags & FLAGS_DID_CORE) == 0) { 897 if (do_core_note(ms, nbuf, xnh_type, swap, 898 namesz, descsz, noff, doff, flags, size, clazz)) 899 return size; 900 } 901 902 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 903 if (descsz > 100) 904 descsz = 100; 905 switch (xnh_type) { 906 case NT_NETBSD_VERSION: 907 return size; 908 case NT_NETBSD_MARCH: 909 if (*flags & FLAGS_DID_NETBSD_MARCH) 910 return size; 911 *flags |= FLAGS_DID_NETBSD_MARCH; 912 if (file_printf(ms, ", compiled for: %.*s", 913 (int)descsz, (const char *)&nbuf[doff]) == -1) 914 return size; 915 break; 916 case NT_NETBSD_CMODEL: 917 if (*flags & FLAGS_DID_NETBSD_CMODEL) 918 return size; 919 *flags |= FLAGS_DID_NETBSD_CMODEL; 920 if (file_printf(ms, ", compiler model: %.*s", 921 (int)descsz, (const char *)&nbuf[doff]) == -1) 922 return size; 923 break; 924 default: 925 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 926 return size; 927 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 928 if (file_printf(ms, ", note=%u", xnh_type) == -1) 929 return size; 930 break; 931 } 932 return size; 933 } 934 935 return offset; 936 } 937 938 /* SunOS 5.x hardware capability descriptions */ 939 typedef struct cap_desc { 940 uint64_t cd_mask; 941 const char *cd_name; 942 } cap_desc_t; 943 944 static const cap_desc_t cap_desc_sparc[] = { 945 { AV_SPARC_MUL32, "MUL32" }, 946 { AV_SPARC_DIV32, "DIV32" }, 947 { AV_SPARC_FSMULD, "FSMULD" }, 948 { AV_SPARC_V8PLUS, "V8PLUS" }, 949 { AV_SPARC_POPC, "POPC" }, 950 { AV_SPARC_VIS, "VIS" }, 951 { AV_SPARC_VIS2, "VIS2" }, 952 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 953 { AV_SPARC_FMAF, "FMAF" }, 954 { AV_SPARC_FJFMAU, "FJFMAU" }, 955 { AV_SPARC_IMA, "IMA" }, 956 { 0, NULL } 957 }; 958 959 static const cap_desc_t cap_desc_386[] = { 960 { AV_386_FPU, "FPU" }, 961 { AV_386_TSC, "TSC" }, 962 { AV_386_CX8, "CX8" }, 963 { AV_386_SEP, "SEP" }, 964 { AV_386_AMD_SYSC, "AMD_SYSC" }, 965 { AV_386_CMOV, "CMOV" }, 966 { AV_386_MMX, "MMX" }, 967 { AV_386_AMD_MMX, "AMD_MMX" }, 968 { AV_386_AMD_3DNow, "AMD_3DNow" }, 969 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 970 { AV_386_FXSR, "FXSR" }, 971 { AV_386_SSE, "SSE" }, 972 { AV_386_SSE2, "SSE2" }, 973 { AV_386_PAUSE, "PAUSE" }, 974 { AV_386_SSE3, "SSE3" }, 975 { AV_386_MON, "MON" }, 976 { AV_386_CX16, "CX16" }, 977 { AV_386_AHF, "AHF" }, 978 { AV_386_TSCP, "TSCP" }, 979 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 980 { AV_386_POPCNT, "POPCNT" }, 981 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 982 { AV_386_SSSE3, "SSSE3" }, 983 { AV_386_SSE4_1, "SSE4.1" }, 984 { AV_386_SSE4_2, "SSE4.2" }, 985 { 0, NULL } 986 }; 987 988 private int 989 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 990 size_t size, off_t fsize, int mach, int strtab, int *flags, 991 uint16_t *notecount) 992 { 993 Elf32_Shdr sh32; 994 Elf64_Shdr sh64; 995 int stripped = 1; 996 size_t nbadcap = 0; 997 void *nbuf; 998 off_t noff, coff, name_off; 999 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */ 1000 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */ 1001 char name[50]; 1002 ssize_t namesize; 1003 1004 if (size != xsh_sizeof) { 1005 if (file_printf(ms, ", corrupted section header size") == -1) 1006 return -1; 1007 return 0; 1008 } 1009 1010 /* Read offset of name section to be able to read section names later */ 1011 if (pread(fd, xsh_addr, xsh_sizeof, off + size * strtab) < (ssize_t)xsh_sizeof) { 1012 file_badread(ms); 1013 return -1; 1014 } 1015 name_off = xsh_offset; 1016 1017 for ( ; num; num--) { 1018 /* Read the name of this section. */ 1019 if ((namesize = pread(fd, name, sizeof(name) - 1, name_off + xsh_name)) == -1) { 1020 file_badread(ms); 1021 return -1; 1022 } 1023 name[namesize] = '\0'; 1024 if (strcmp(name, ".debug_info") == 0) 1025 stripped = 0; 1026 1027 if (pread(fd, xsh_addr, xsh_sizeof, off) < (ssize_t)xsh_sizeof) { 1028 file_badread(ms); 1029 return -1; 1030 } 1031 off += size; 1032 1033 /* Things we can determine before we seek */ 1034 switch (xsh_type) { 1035 case SHT_SYMTAB: 1036 #if 0 1037 case SHT_DYNSYM: 1038 #endif 1039 stripped = 0; 1040 break; 1041 default: 1042 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1043 /* Perhaps warn here */ 1044 continue; 1045 } 1046 break; 1047 } 1048 1049 /* Things we can determine when we seek */ 1050 switch (xsh_type) { 1051 case SHT_NOTE: 1052 if ((nbuf = malloc(xsh_size)) == NULL) { 1053 file_error(ms, errno, "Cannot allocate memory" 1054 " for note"); 1055 return -1; 1056 } 1057 if (pread(fd, nbuf, xsh_size, xsh_offset) < (ssize_t)xsh_size) { 1058 file_badread(ms); 1059 free(nbuf); 1060 return -1; 1061 } 1062 1063 noff = 0; 1064 for (;;) { 1065 if (noff >= (off_t)xsh_size) 1066 break; 1067 noff = donote(ms, nbuf, (size_t)noff, 1068 xsh_size, clazz, swap, 4, flags, notecount); 1069 if (noff == 0) 1070 break; 1071 } 1072 free(nbuf); 1073 break; 1074 case SHT_SUNW_cap: 1075 switch (mach) { 1076 case EM_SPARC: 1077 case EM_SPARCV9: 1078 case EM_IA_64: 1079 case EM_386: 1080 case EM_AMD64: 1081 break; 1082 default: 1083 goto skip; 1084 } 1085 1086 if (nbadcap > 5) 1087 break; 1088 if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) { 1089 file_badseek(ms); 1090 return -1; 1091 } 1092 coff = 0; 1093 for (;;) { 1094 Elf32_Cap cap32; 1095 Elf64_Cap cap64; 1096 char cbuf[/*CONSTCOND*/ 1097 MAX(sizeof cap32, sizeof cap64)]; 1098 if ((coff += xcap_sizeof) > (off_t)xsh_size) 1099 break; 1100 if (read(fd, cbuf, (size_t)xcap_sizeof) != 1101 (ssize_t)xcap_sizeof) { 1102 file_badread(ms); 1103 return -1; 1104 } 1105 if (cbuf[0] == 'A') { 1106 #ifdef notyet 1107 char *p = cbuf + 1; 1108 uint32_t len, tag; 1109 memcpy(&len, p, sizeof(len)); 1110 p += 4; 1111 len = getu32(swap, len); 1112 if (memcmp("gnu", p, 3) != 0) { 1113 if (file_printf(ms, 1114 ", unknown capability %.3s", p) 1115 == -1) 1116 return -1; 1117 break; 1118 } 1119 p += strlen(p) + 1; 1120 tag = *p++; 1121 memcpy(&len, p, sizeof(len)); 1122 p += 4; 1123 len = getu32(swap, len); 1124 if (tag != 1) { 1125 if (file_printf(ms, ", unknown gnu" 1126 " capability tag %d", tag) 1127 == -1) 1128 return -1; 1129 break; 1130 } 1131 // gnu attributes 1132 #endif 1133 break; 1134 } 1135 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 1136 switch (xcap_tag) { 1137 case CA_SUNW_NULL: 1138 break; 1139 case CA_SUNW_HW_1: 1140 cap_hw1 |= xcap_val; 1141 break; 1142 case CA_SUNW_SF_1: 1143 cap_sf1 |= xcap_val; 1144 break; 1145 default: 1146 if (file_printf(ms, 1147 ", with unknown capability " 1148 "0x%" INT64_T_FORMAT "x = 0x%" 1149 INT64_T_FORMAT "x", 1150 (unsigned long long)xcap_tag, 1151 (unsigned long long)xcap_val) == -1) 1152 return -1; 1153 if (nbadcap++ > 2) 1154 coff = xsh_size; 1155 break; 1156 } 1157 } 1158 /*FALLTHROUGH*/ 1159 skip: 1160 default: 1161 break; 1162 } 1163 } 1164 1165 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1166 return -1; 1167 if (cap_hw1) { 1168 const cap_desc_t *cdp; 1169 switch (mach) { 1170 case EM_SPARC: 1171 case EM_SPARC32PLUS: 1172 case EM_SPARCV9: 1173 cdp = cap_desc_sparc; 1174 break; 1175 case EM_386: 1176 case EM_IA_64: 1177 case EM_AMD64: 1178 cdp = cap_desc_386; 1179 break; 1180 default: 1181 cdp = NULL; 1182 break; 1183 } 1184 if (file_printf(ms, ", uses") == -1) 1185 return -1; 1186 if (cdp) { 1187 while (cdp->cd_name) { 1188 if (cap_hw1 & cdp->cd_mask) { 1189 if (file_printf(ms, 1190 " %s", cdp->cd_name) == -1) 1191 return -1; 1192 cap_hw1 &= ~cdp->cd_mask; 1193 } 1194 ++cdp; 1195 } 1196 if (cap_hw1) 1197 if (file_printf(ms, 1198 " unknown hardware capability 0x%" 1199 INT64_T_FORMAT "x", 1200 (unsigned long long)cap_hw1) == -1) 1201 return -1; 1202 } else { 1203 if (file_printf(ms, 1204 " hardware capability 0x%" INT64_T_FORMAT "x", 1205 (unsigned long long)cap_hw1) == -1) 1206 return -1; 1207 } 1208 } 1209 if (cap_sf1) { 1210 if (cap_sf1 & SF1_SUNW_FPUSED) { 1211 if (file_printf(ms, 1212 (cap_sf1 & SF1_SUNW_FPKNWN) 1213 ? ", uses frame pointer" 1214 : ", not known to use frame pointer") == -1) 1215 return -1; 1216 } 1217 cap_sf1 &= ~SF1_SUNW_MASK; 1218 if (cap_sf1) 1219 if (file_printf(ms, 1220 ", with unknown software capability 0x%" 1221 INT64_T_FORMAT "x", 1222 (unsigned long long)cap_sf1) == -1) 1223 return -1; 1224 } 1225 return 0; 1226 } 1227 1228 /* 1229 * Look through the program headers of an executable image, searching 1230 * for a PT_INTERP section; if one is found, it's dynamically linked, 1231 * otherwise it's statically linked. 1232 */ 1233 private int 1234 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1235 int num, size_t size, off_t fsize, int sh_num, int *flags, 1236 uint16_t *notecount) 1237 { 1238 Elf32_Phdr ph32; 1239 Elf64_Phdr ph64; 1240 const char *linking_style = "statically"; 1241 const char *interp = ""; 1242 unsigned char nbuf[BUFSIZ]; 1243 char ibuf[BUFSIZ]; 1244 ssize_t bufsize; 1245 size_t offset, align, len; 1246 1247 if (size != xph_sizeof) { 1248 if (file_printf(ms, ", corrupted program header size") == -1) 1249 return -1; 1250 return 0; 1251 } 1252 1253 for ( ; num; num--) { 1254 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 1255 file_badread(ms); 1256 return -1; 1257 } 1258 1259 off += size; 1260 bufsize = 0; 1261 align = 4; 1262 1263 /* Things we can determine before we seek */ 1264 switch (xph_type) { 1265 case PT_DYNAMIC: 1266 linking_style = "dynamically"; 1267 break; 1268 case PT_NOTE: 1269 if (sh_num) /* Did this through section headers */ 1270 continue; 1271 if (((align = xph_align) & 0x80000000UL) != 0 || 1272 align < 4) { 1273 if (file_printf(ms, 1274 ", invalid note alignment 0x%lx", 1275 (unsigned long)align) == -1) 1276 return -1; 1277 align = 4; 1278 } 1279 /*FALLTHROUGH*/ 1280 case PT_INTERP: 1281 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1282 : sizeof(nbuf); 1283 bufsize = pread(fd, nbuf, len, xph_offset); 1284 if (bufsize == -1) { 1285 file_badread(ms); 1286 return -1; 1287 } 1288 break; 1289 default: 1290 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1291 /* Maybe warn here? */ 1292 continue; 1293 } 1294 break; 1295 } 1296 1297 /* Things we can determine when we seek */ 1298 switch (xph_type) { 1299 case PT_INTERP: 1300 if (bufsize && nbuf[0]) { 1301 nbuf[bufsize - 1] = '\0'; 1302 interp = (const char *)nbuf; 1303 } else 1304 interp = "*empty*"; 1305 break; 1306 case PT_NOTE: 1307 /* 1308 * This is a PT_NOTE section; loop through all the notes 1309 * in the section. 1310 */ 1311 offset = 0; 1312 for (;;) { 1313 if (offset >= (size_t)bufsize) 1314 break; 1315 offset = donote(ms, nbuf, offset, 1316 (size_t)bufsize, clazz, swap, align, 1317 flags, notecount); 1318 if (offset == 0) 1319 break; 1320 } 1321 break; 1322 default: 1323 break; 1324 } 1325 } 1326 if (file_printf(ms, ", %s linked", linking_style) 1327 == -1) 1328 return -1; 1329 if (interp[0]) 1330 if (file_printf(ms, ", interpreter %s", 1331 file_printable(ibuf, sizeof(ibuf), interp)) == -1) 1332 return -1; 1333 return 0; 1334 } 1335 1336 1337 protected int 1338 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, 1339 size_t nbytes) 1340 { 1341 union { 1342 int32_t l; 1343 char c[sizeof (int32_t)]; 1344 } u; 1345 int clazz; 1346 int swap; 1347 struct stat st; 1348 off_t fsize; 1349 int flags = 0; 1350 Elf32_Ehdr elf32hdr; 1351 Elf64_Ehdr elf64hdr; 1352 uint16_t type, phnum, shnum, notecount; 1353 1354 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) 1355 return 0; 1356 /* 1357 * ELF executables have multiple section headers in arbitrary 1358 * file locations and thus file(1) cannot determine it from easily. 1359 * Instead we traverse thru all section headers until a symbol table 1360 * one is found or else the binary is stripped. 1361 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1362 */ 1363 if (buf[EI_MAG0] != ELFMAG0 1364 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1365 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1366 return 0; 1367 1368 /* 1369 * If we cannot seek, it must be a pipe, socket or fifo. 1370 */ 1371 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1372 fd = file_pipe2file(ms, fd, buf, nbytes); 1373 1374 if (fstat(fd, &st) == -1) { 1375 file_badread(ms); 1376 return -1; 1377 } 1378 if (S_ISREG(st.st_mode) || st.st_size != 0) 1379 fsize = st.st_size; 1380 else 1381 fsize = SIZE_UNKNOWN; 1382 1383 clazz = buf[EI_CLASS]; 1384 1385 switch (clazz) { 1386 case ELFCLASS32: 1387 #undef elf_getu 1388 #define elf_getu(a, b) elf_getu32(a, b) 1389 #undef elfhdr 1390 #define elfhdr elf32hdr 1391 #include "elfclass.h" 1392 case ELFCLASS64: 1393 #undef elf_getu 1394 #define elf_getu(a, b) elf_getu64(a, b) 1395 #undef elfhdr 1396 #define elfhdr elf64hdr 1397 #include "elfclass.h" 1398 default: 1399 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1400 return -1; 1401 break; 1402 } 1403 return 0; 1404 } 1405 #endif 1406