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 1.81 2008/11/04 16:38:28 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 *); 47 #endif 48 private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t, 49 off_t, int *, int); 50 private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, int *, 51 int); 52 private size_t donote(struct magic_set *, void *, size_t, size_t, int, 53 int, size_t, int *); 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 private uint16_t 64 getu16(int swap, uint16_t value) 65 { 66 union { 67 uint16_t ui; 68 char c[2]; 69 } retval, tmpval; 70 71 if (swap) { 72 tmpval.ui = value; 73 74 retval.c[0] = tmpval.c[1]; 75 retval.c[1] = tmpval.c[0]; 76 77 return retval.ui; 78 } else 79 return value; 80 } 81 82 private uint32_t 83 getu32(int swap, uint32_t value) 84 { 85 union { 86 uint32_t ui; 87 char c[4]; 88 } retval, tmpval; 89 90 if (swap) { 91 tmpval.ui = value; 92 93 retval.c[0] = tmpval.c[3]; 94 retval.c[1] = tmpval.c[2]; 95 retval.c[2] = tmpval.c[1]; 96 retval.c[3] = tmpval.c[0]; 97 98 return retval.ui; 99 } else 100 return value; 101 } 102 103 private uint64_t 104 getu64(int swap, uint64_t value) 105 { 106 union { 107 uint64_t ui; 108 char c[8]; 109 } retval, tmpval; 110 111 if (swap) { 112 tmpval.ui = value; 113 114 retval.c[0] = tmpval.c[7]; 115 retval.c[1] = tmpval.c[6]; 116 retval.c[2] = tmpval.c[5]; 117 retval.c[3] = tmpval.c[4]; 118 retval.c[4] = tmpval.c[3]; 119 retval.c[5] = tmpval.c[2]; 120 retval.c[6] = tmpval.c[1]; 121 retval.c[7] = tmpval.c[0]; 122 123 return retval.ui; 124 } else 125 return value; 126 } 127 128 #define elf_getu16(swap, value) getu16(swap, value) 129 #define elf_getu32(swap, value) getu32(swap, value) 130 #ifdef USE_ARRAY_FOR_64BIT_TYPES 131 # define elf_getu64(swap, array) \ 132 ((swap ? ((uint64_t)elf_getu32(swap, array[0])) << 32 : elf_getu32(swap, array[0])) + \ 133 (swap ? elf_getu32(swap, array[1]) : ((uint64_t)elf_getu32(swap, array[1]) << 32))) 134 #else 135 # define elf_getu64(swap, value) getu64(swap, value) 136 #endif 137 138 #define xsh_addr (clazz == ELFCLASS32 \ 139 ? (void *) &sh32 \ 140 : (void *) &sh64) 141 #define xsh_sizeof (clazz == ELFCLASS32 \ 142 ? sizeof sh32 \ 143 : sizeof sh64) 144 #define xsh_size (clazz == ELFCLASS32 \ 145 ? elf_getu32(swap, sh32.sh_size) \ 146 : elf_getu64(swap, sh64.sh_size)) 147 #define xsh_offset (clazz == ELFCLASS32 \ 148 ? elf_getu32(swap, sh32.sh_offset) \ 149 : elf_getu64(swap, sh64.sh_offset)) 150 #define xsh_type (clazz == ELFCLASS32 \ 151 ? elf_getu32(swap, sh32.sh_type) \ 152 : elf_getu32(swap, sh64.sh_type)) 153 #define xph_addr (clazz == ELFCLASS32 \ 154 ? (void *) &ph32 \ 155 : (void *) &ph64) 156 #define xph_sizeof (clazz == ELFCLASS32 \ 157 ? sizeof ph32 \ 158 : sizeof ph64) 159 #define xph_type (clazz == ELFCLASS32 \ 160 ? elf_getu32(swap, ph32.p_type) \ 161 : elf_getu32(swap, ph64.p_type)) 162 #define xph_offset (off_t)(clazz == ELFCLASS32 \ 163 ? elf_getu32(swap, ph32.p_offset) \ 164 : elf_getu64(swap, ph64.p_offset)) 165 #define xph_align (size_t)((clazz == ELFCLASS32 \ 166 ? (off_t) (ph32.p_align ? \ 167 elf_getu32(swap, ph32.p_align) : 4) \ 168 : (off_t) (ph64.p_align ? \ 169 elf_getu64(swap, ph64.p_align) : 4))) 170 #define xph_filesz (size_t)((clazz == ELFCLASS32 \ 171 ? elf_getu32(swap, ph32.p_filesz) \ 172 : elf_getu64(swap, ph64.p_filesz))) 173 #define xnh_addr (clazz == ELFCLASS32 \ 174 ? (void *) &nh32 \ 175 : (void *) &nh64) 176 #define xph_memsz (size_t)((clazz == ELFCLASS32 \ 177 ? elf_getu32(swap, ph32.p_memsz) \ 178 : elf_getu64(swap, ph64.p_memsz))) 179 #define xnh_sizeof (clazz == ELFCLASS32 \ 180 ? sizeof nh32 \ 181 : sizeof nh64) 182 #define xnh_type (clazz == ELFCLASS32 \ 183 ? elf_getu32(swap, nh32.n_type) \ 184 : elf_getu32(swap, nh64.n_type)) 185 #define xnh_namesz (clazz == ELFCLASS32 \ 186 ? elf_getu32(swap, nh32.n_namesz) \ 187 : elf_getu32(swap, nh64.n_namesz)) 188 #define xnh_descsz (clazz == ELFCLASS32 \ 189 ? elf_getu32(swap, nh32.n_descsz) \ 190 : elf_getu32(swap, nh64.n_descsz)) 191 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 192 ? prpsoffsets32[i] \ 193 : prpsoffsets64[i]) 194 #define xcap_addr (clazz == ELFCLASS32 \ 195 ? (void *) &cap32 \ 196 : (void *) &cap64) 197 #define xcap_sizeof (clazz == ELFCLASS32 \ 198 ? sizeof cap32 \ 199 : sizeof cap64) 200 #define xcap_tag (clazz == ELFCLASS32 \ 201 ? elf_getu32(swap, cap32.c_tag) \ 202 : elf_getu64(swap, cap64.c_tag)) 203 #define xcap_val (clazz == ELFCLASS32 \ 204 ? elf_getu32(swap, cap32.c_un.c_val) \ 205 : elf_getu64(swap, cap64.c_un.c_val)) 206 207 #ifdef ELFCORE 208 /* 209 * Try larger offsets first to avoid false matches 210 * from earlier data that happen to look like strings. 211 */ 212 static const size_t prpsoffsets32[] = { 213 #ifdef USE_NT_PSINFO 214 104, /* SunOS 5.x (command line) */ 215 88, /* SunOS 5.x (short name) */ 216 #endif /* USE_NT_PSINFO */ 217 218 100, /* SunOS 5.x (command line) */ 219 84, /* SunOS 5.x (short name) */ 220 221 44, /* Linux (command line) */ 222 28, /* Linux 2.0.36 (short name) */ 223 224 8, /* FreeBSD */ 225 }; 226 227 static const size_t prpsoffsets64[] = { 228 #ifdef USE_NT_PSINFO 229 152, /* SunOS 5.x (command line) */ 230 136, /* SunOS 5.x (short name) */ 231 #endif /* USE_NT_PSINFO */ 232 233 136, /* SunOS 5.x, 64-bit (command line) */ 234 120, /* SunOS 5.x, 64-bit (short name) */ 235 236 56, /* Linux (command line) */ 237 40, /* Linux (tested on core from 2.4.x, short name) */ 238 239 16, /* FreeBSD, 64-bit */ 240 }; 241 242 #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0]) 243 #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0]) 244 245 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 246 247 /* 248 * Look through the program headers of an executable image, searching 249 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 250 * "FreeBSD"; if one is found, try looking in various places in its 251 * contents for a 16-character string containing only printable 252 * characters - if found, that string should be the name of the program 253 * that dropped core. Note: right after that 16-character string is, 254 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 255 * Linux, a longer string (80 characters, in 5.x, probably other 256 * SVR4-flavored systems, and Linux) containing the start of the 257 * command line for that program. 258 * 259 * SunOS 5.x core files contain two PT_NOTE sections, with the types 260 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 261 * same info about the command name and command line, so it probably 262 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 263 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 264 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 265 * the SunOS 5.x file command relies on this (and prefers the latter). 266 * 267 * The signal number probably appears in a section of type NT_PRSTATUS, 268 * but that's also rather OS-dependent, in ways that are harder to 269 * dissect with heuristics, so I'm not bothering with the signal number. 270 * (I suppose the signal number could be of interest in situations where 271 * you don't have the binary of the program that dropped core; if you 272 * *do* have that binary, the debugger will probably tell you what 273 * signal it was.) 274 */ 275 276 #define OS_STYLE_SVR4 0 277 #define OS_STYLE_FREEBSD 1 278 #define OS_STYLE_NETBSD 2 279 280 private const char os_style_names[][8] = { 281 "SVR4", 282 "FreeBSD", 283 "NetBSD", 284 }; 285 286 #define FLAGS_DID_CORE 1 287 #define FLAGS_DID_NOTE 2 288 #define FLAGS_DID_CORE_STYLE 4 289 290 private int 291 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 292 int num, size_t size, off_t fsize, int *flags) 293 { 294 Elf32_Phdr ph32; 295 Elf64_Phdr ph64; 296 size_t offset; 297 unsigned char nbuf[BUFSIZ]; 298 ssize_t bufsize; 299 off_t savedoffset; 300 struct stat st; 301 302 if (fstat(fd, &st) < 0) { 303 file_badread(ms); 304 return -1; 305 } 306 307 if (size != xph_sizeof) { 308 if (file_printf(ms, ", corrupted program header size") == -1) 309 return -1; 310 return 0; 311 } 312 313 /* 314 * Loop through all the program headers. 315 */ 316 for ( ; num; num--) { 317 if ((savedoffset = lseek(fd, off, SEEK_SET)) == (off_t)-1) { 318 file_badseek(ms); 319 return -1; 320 } 321 if (read(fd, xph_addr, xph_sizeof) == -1) { 322 file_badread(ms); 323 return -1; 324 } 325 if (xph_offset > fsize) { 326 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 327 file_badseek(ms); 328 return -1; 329 } 330 continue; 331 } 332 333 off += size; 334 if (xph_type != PT_NOTE) 335 continue; 336 337 /* 338 * This is a PT_NOTE section; loop through all the notes 339 * in the section. 340 */ 341 if (lseek(fd, xph_offset, SEEK_SET) == (off_t)-1) { 342 file_badseek(ms); 343 return -1; 344 } 345 bufsize = read(fd, nbuf, 346 ((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf))); 347 if (bufsize == -1) { 348 file_badread(ms); 349 return -1; 350 } 351 offset = 0; 352 for (;;) { 353 if (offset >= (size_t)bufsize) 354 break; 355 offset = donote(ms, nbuf, offset, (size_t)bufsize, 356 clazz, swap, 4, flags); 357 if (offset == 0) 358 break; 359 360 } 361 } 362 return 0; 363 } 364 #endif 365 366 private size_t 367 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 368 int clazz, int swap, size_t align, int *flags) 369 { 370 Elf32_Nhdr nh32; 371 Elf64_Nhdr nh64; 372 size_t noff, doff; 373 #ifdef ELFCORE 374 int os_style = -1; 375 #endif 376 uint32_t namesz, descsz; 377 unsigned char *nbuf = CAST(unsigned char *, vbuf); 378 379 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 380 offset += xnh_sizeof; 381 382 namesz = xnh_namesz; 383 descsz = xnh_descsz; 384 if ((namesz == 0) && (descsz == 0)) { 385 /* 386 * We're out of note headers. 387 */ 388 return (offset >= size) ? offset : size; 389 } 390 391 if (namesz & 0x80000000) { 392 (void)file_printf(ms, ", bad note name size 0x%lx", 393 (unsigned long)namesz); 394 return offset; 395 } 396 397 if (descsz & 0x80000000) { 398 (void)file_printf(ms, ", bad note description size 0x%lx", 399 (unsigned long)descsz); 400 return offset; 401 } 402 403 404 noff = offset; 405 doff = ELF_ALIGN(offset + namesz); 406 407 if (offset + namesz > size) { 408 /* 409 * We're past the end of the buffer. 410 */ 411 return doff; 412 } 413 414 offset = ELF_ALIGN(doff + descsz); 415 if (doff + descsz > size) { 416 /* 417 * We're past the end of the buffer. 418 */ 419 return (offset >= size) ? offset : size; 420 } 421 422 if (*flags & FLAGS_DID_NOTE) 423 goto core; 424 425 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 426 xnh_type == NT_GNU_VERSION && descsz == 16) { 427 uint32_t desc[4]; 428 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 429 430 if (file_printf(ms, ", for GNU/") == -1) 431 return size; 432 switch (elf_getu32(swap, desc[0])) { 433 case GNU_OS_LINUX: 434 if (file_printf(ms, "Linux") == -1) 435 return size; 436 break; 437 case GNU_OS_HURD: 438 if (file_printf(ms, "Hurd") == -1) 439 return size; 440 break; 441 case GNU_OS_SOLARIS: 442 if (file_printf(ms, "Solaris") == -1) 443 return size; 444 break; 445 case GNU_OS_KFREEBSD: 446 if (file_printf(ms, "kFreeBSD") == -1) 447 return size; 448 break; 449 case GNU_OS_KNETBSD: 450 if (file_printf(ms, "kNetBSD") == -1) 451 return size; 452 break; 453 default: 454 if (file_printf(ms, "<unknown>") == -1) 455 return size; 456 } 457 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 458 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 459 return size; 460 *flags |= FLAGS_DID_NOTE; 461 return size; 462 } 463 464 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 && 465 xnh_type == NT_NETBSD_VERSION && descsz == 4) { 466 uint32_t desc; 467 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 468 desc = elf_getu32(swap, desc); 469 470 if (file_printf(ms, ", for NetBSD") == -1) 471 return size; 472 /* 473 * The version number used to be stuck as 199905, and was thus 474 * basically content-free. Newer versions of NetBSD have fixed 475 * this and now use the encoding of __NetBSD_Version__: 476 * 477 * MMmmrrpp00 478 * 479 * M = major version 480 * m = minor version 481 * r = release ["",A-Z,Z[A-Z] but numeric] 482 * p = patchlevel 483 */ 484 if (desc > 100000000U) { 485 uint32_t ver_patch = (desc / 100) % 100; 486 uint32_t ver_rel = (desc / 10000) % 100; 487 uint32_t ver_min = (desc / 1000000) % 100; 488 uint32_t ver_maj = desc / 100000000; 489 490 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 491 return size; 492 if (ver_rel == 0 && ver_patch != 0) { 493 if (file_printf(ms, ".%u", ver_patch) == -1) 494 return size; 495 } else if (ver_rel != 0) { 496 while (ver_rel > 26) { 497 if (file_printf(ms, "Z") == -1) 498 return size; 499 ver_rel -= 26; 500 } 501 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 502 == -1) 503 return size; 504 } 505 } 506 *flags |= FLAGS_DID_NOTE; 507 return size; 508 } 509 510 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 && 511 xnh_type == NT_FREEBSD_VERSION && descsz == 4) { 512 uint32_t desc; 513 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 514 desc = elf_getu32(swap, desc); 515 if (file_printf(ms, ", for FreeBSD") == -1) 516 return size; 517 518 /* 519 * Contents is __FreeBSD_version, whose relation to OS 520 * versions is defined by a huge table in the Porter's 521 * Handbook. This is the general scheme: 522 * 523 * Releases: 524 * Mmp000 (before 4.10) 525 * Mmi0p0 (before 5.0) 526 * Mmm0p0 527 * 528 * Development branches: 529 * Mmpxxx (before 4.6) 530 * Mmp1xx (before 4.10) 531 * Mmi1xx (before 5.0) 532 * M000xx (pre-M.0) 533 * Mmm1xx 534 * 535 * M = major version 536 * m = minor version 537 * i = minor version increment (491000 -> 4.10) 538 * p = patchlevel 539 * x = revision 540 * 541 * The first release of FreeBSD to use ELF by default 542 * was version 3.0. 543 */ 544 if (desc == 460002) { 545 if (file_printf(ms, " 4.6.2") == -1) 546 return size; 547 } else if (desc < 460100) { 548 if (file_printf(ms, " %d.%d", desc / 100000, 549 desc / 10000 % 10) == -1) 550 return size; 551 if (desc / 1000 % 10 > 0) 552 if (file_printf(ms, ".%d", desc / 1000 % 10) 553 == -1) 554 return size; 555 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 556 if (file_printf(ms, " (%d)", desc) == -1) 557 return size; 558 } else if (desc < 500000) { 559 if (file_printf(ms, " %d.%d", desc / 100000, 560 desc / 10000 % 10 + desc / 1000 % 10) == -1) 561 return size; 562 if (desc / 100 % 10 > 0) { 563 if (file_printf(ms, " (%d)", desc) == -1) 564 return size; 565 } else if (desc / 10 % 10 > 0) { 566 if (file_printf(ms, ".%d", desc / 10 % 10) 567 == -1) 568 return size; 569 } 570 } else { 571 if (file_printf(ms, " %d.%d", desc / 100000, 572 desc / 1000 % 100) == -1) 573 return size; 574 if ((desc / 100 % 10 > 0) || 575 (desc % 100000 / 100 == 0)) { 576 if (file_printf(ms, " (%d)", desc) == -1) 577 return size; 578 } else if (desc / 10 % 10 > 0) { 579 if (file_printf(ms, ".%d", desc / 10 % 10) 580 == -1) 581 return size; 582 } 583 } 584 *flags |= FLAGS_DID_NOTE; 585 return size; 586 } 587 588 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && 589 xnh_type == NT_OPENBSD_VERSION && descsz == 4) { 590 if (file_printf(ms, ", for OpenBSD") == -1) 591 return size; 592 /* Content of note is always 0 */ 593 *flags |= FLAGS_DID_NOTE; 594 return size; 595 } 596 597 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && 598 xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) { 599 uint32_t desc; 600 if (file_printf(ms, ", for DragonFly") == -1) 601 return size; 602 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 603 desc = elf_getu32(swap, desc); 604 if (file_printf(ms, " %d.%d.%d", desc / 100000, 605 desc / 10000 % 10, desc % 10000) == -1) 606 return size; 607 *flags |= FLAGS_DID_NOTE; 608 return size; 609 } 610 611 core: 612 /* 613 * Sigh. The 2.0.36 kernel in Debian 2.1, at 614 * least, doesn't correctly implement name 615 * sections, in core dumps, as specified by 616 * the "Program Linking" section of "UNIX(R) System 617 * V Release 4 Programmer's Guide: ANSI C and 618 * Programming Support Tools", because my copy 619 * clearly says "The first 'namesz' bytes in 'name' 620 * contain a *null-terminated* [emphasis mine] 621 * character representation of the entry's owner 622 * or originator", but the 2.0.36 kernel code 623 * doesn't include the terminating null in the 624 * name.... 625 */ 626 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || 627 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { 628 os_style = OS_STYLE_SVR4; 629 } 630 631 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { 632 os_style = OS_STYLE_FREEBSD; 633 } 634 635 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) 636 == 0)) { 637 os_style = OS_STYLE_NETBSD; 638 } 639 640 #ifdef ELFCORE 641 if ((*flags & FLAGS_DID_CORE) != 0) 642 return size; 643 644 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 645 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 646 == -1) 647 return size; 648 *flags |= FLAGS_DID_CORE_STYLE; 649 } 650 651 switch (os_style) { 652 case OS_STYLE_NETBSD: 653 if (xnh_type == NT_NETBSD_CORE_PROCINFO) { 654 uint32_t signo; 655 /* 656 * Extract the program name. It is at 657 * offset 0x7c, and is up to 32-bytes, 658 * including the terminating NUL. 659 */ 660 if (file_printf(ms, ", from '%.31s'", 661 &nbuf[doff + 0x7c]) == -1) 662 return size; 663 664 /* 665 * Extract the signal number. It is at 666 * offset 0x08. 667 */ 668 (void)memcpy(&signo, &nbuf[doff + 0x08], 669 sizeof(signo)); 670 if (file_printf(ms, " (signal %u)", 671 elf_getu32(swap, signo)) == -1) 672 return size; 673 *flags |= FLAGS_DID_CORE; 674 return size; 675 } 676 break; 677 678 default: 679 if (xnh_type == NT_PRPSINFO) { 680 size_t i, j; 681 unsigned char c; 682 /* 683 * Extract the program name. We assume 684 * it to be 16 characters (that's what it 685 * is in SunOS 5.x and Linux). 686 * 687 * Unfortunately, it's at a different offset 688 * in various OSes, so try multiple offsets. 689 * If the characters aren't all printable, 690 * reject it. 691 */ 692 for (i = 0; i < NOFFSETS; i++) { 693 unsigned char *cname, *cp; 694 size_t reloffset = prpsoffsets(i); 695 size_t noffset = doff + reloffset; 696 for (j = 0; j < 16; j++, noffset++, 697 reloffset++) { 698 /* 699 * Make sure we're not past 700 * the end of the buffer; if 701 * we are, just give up. 702 */ 703 if (noffset >= size) 704 goto tryanother; 705 706 /* 707 * Make sure we're not past 708 * the end of the contents; 709 * if we are, this obviously 710 * isn't the right offset. 711 */ 712 if (reloffset >= descsz) 713 goto tryanother; 714 715 c = nbuf[noffset]; 716 if (c == '\0') { 717 /* 718 * A '\0' at the 719 * beginning is 720 * obviously wrong. 721 * Any other '\0' 722 * means we're done. 723 */ 724 if (j == 0) 725 goto tryanother; 726 else 727 break; 728 } else { 729 /* 730 * A nonprintable 731 * character is also 732 * wrong. 733 */ 734 if (!isprint(c) || isquote(c)) 735 goto tryanother; 736 } 737 } 738 /* 739 * Well, that worked. 740 */ 741 cname = (unsigned char *) 742 &nbuf[doff + prpsoffsets(i)]; 743 for (cp = cname; *cp && isprint(*cp); cp++) 744 continue; 745 /* 746 * Linux apparently appends a space at the end 747 * of the command line: remove it. 748 */ 749 while (cp > cname && isspace(cp[-1])) 750 cp--; 751 if (file_printf(ms, ", from '%.*s'", 752 (int)(cp - cname), cname) == -1) 753 return size; 754 *flags |= FLAGS_DID_CORE; 755 return size; 756 757 tryanother: 758 ; 759 } 760 } 761 break; 762 } 763 #endif 764 return offset; 765 } 766 767 /* SunOS 5.x hardware capability descriptions */ 768 typedef struct cap_desc { 769 uint64_t cd_mask; 770 const char *cd_name; 771 } cap_desc_t; 772 773 static const cap_desc_t cap_desc_sparc[] = { 774 { AV_SPARC_MUL32, "MUL32" }, 775 { AV_SPARC_DIV32, "DIV32" }, 776 { AV_SPARC_FSMULD, "FSMULD" }, 777 { AV_SPARC_V8PLUS, "V8PLUS" }, 778 { AV_SPARC_POPC, "POPC" }, 779 { AV_SPARC_VIS, "VIS" }, 780 { AV_SPARC_VIS2, "VIS2" }, 781 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 782 { AV_SPARC_FMAF, "FMAF" }, 783 { AV_SPARC_FJFMAU, "FJFMAU" }, 784 { AV_SPARC_IMA, "IMA" }, 785 { 0, NULL } 786 }; 787 788 static const cap_desc_t cap_desc_386[] = { 789 { AV_386_FPU, "FPU" }, 790 { AV_386_TSC, "TSC" }, 791 { AV_386_CX8, "CX8" }, 792 { AV_386_SEP, "SEP" }, 793 { AV_386_AMD_SYSC, "AMD_SYSC" }, 794 { AV_386_CMOV, "CMOV" }, 795 { AV_386_MMX, "MMX" }, 796 { AV_386_AMD_MMX, "AMD_MMX" }, 797 { AV_386_AMD_3DNow, "AMD_3DNow" }, 798 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 799 { AV_386_FXSR, "FXSR" }, 800 { AV_386_SSE, "SSE" }, 801 { AV_386_SSE2, "SSE2" }, 802 { AV_386_PAUSE, "PAUSE" }, 803 { AV_386_SSE3, "SSE3" }, 804 { AV_386_MON, "MON" }, 805 { AV_386_CX16, "CX16" }, 806 { AV_386_AHF, "AHF" }, 807 { AV_386_TSCP, "TSCP" }, 808 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 809 { AV_386_POPCNT, "POPCNT" }, 810 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 811 { AV_386_SSSE3, "SSSE3" }, 812 { AV_386_SSE4_1, "SSE4.1" }, 813 { AV_386_SSE4_2, "SSE4.2" }, 814 { 0, NULL } 815 }; 816 817 private int 818 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 819 size_t size, int *flags, int mach) 820 { 821 Elf32_Shdr sh32; 822 Elf64_Shdr sh64; 823 int stripped = 1; 824 void *nbuf; 825 off_t noff; 826 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */ 827 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */ 828 829 if (size != xsh_sizeof) { 830 if (file_printf(ms, ", corrupted section header size") == -1) 831 return -1; 832 return 0; 833 } 834 835 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 836 file_badseek(ms); 837 return -1; 838 } 839 840 for ( ; num; num--) { 841 if (read(fd, xsh_addr, xsh_sizeof) == -1) { 842 file_badread(ms); 843 return -1; 844 } 845 switch (xsh_type) { 846 case SHT_SYMTAB: 847 #if 0 848 case SHT_DYNSYM: 849 #endif 850 stripped = 0; 851 break; 852 case SHT_NOTE: 853 if ((off = lseek(fd, (off_t)0, SEEK_CUR)) == 854 (off_t)-1) { 855 file_badread(ms); 856 return -1; 857 } 858 if ((nbuf = malloc((size_t)xsh_size)) == NULL) { 859 file_error(ms, errno, "Cannot allocate memory" 860 " for note"); 861 return -1; 862 } 863 if ((noff = lseek(fd, (off_t)xsh_offset, SEEK_SET)) == 864 (off_t)-1) { 865 file_badread(ms); 866 free(nbuf); 867 return -1; 868 } 869 if (read(fd, nbuf, (size_t)xsh_size) != 870 (ssize_t)xsh_size) { 871 free(nbuf); 872 file_badread(ms); 873 return -1; 874 } 875 876 noff = 0; 877 for (;;) { 878 if (noff >= (off_t)xsh_size) 879 break; 880 noff = donote(ms, nbuf, (size_t)noff, 881 (size_t)xsh_size, clazz, swap, 4, 882 flags); 883 if (noff == 0) 884 break; 885 } 886 if ((lseek(fd, off, SEEK_SET)) == (off_t)-1) { 887 free(nbuf); 888 file_badread(ms); 889 return -1; 890 } 891 free(nbuf); 892 break; 893 case SHT_SUNW_cap: 894 { 895 off_t coff; 896 if ((off = lseek(fd, (off_t)0, SEEK_CUR)) == 897 (off_t)-1) { 898 file_badread(ms); 899 return -1; 900 } 901 if (lseek(fd, (off_t)xsh_offset, SEEK_SET) == 902 (off_t)-1) { 903 file_badread(ms); 904 return -1; 905 } 906 coff = 0; 907 for (;;) { 908 Elf32_Cap cap32; 909 Elf64_Cap cap64; 910 char cbuf[/*CONSTCOND*/ 911 MAX(sizeof cap32, sizeof cap64)]; 912 if ((coff += xcap_sizeof) >= (off_t)xsh_size) 913 break; 914 if (read(fd, cbuf, (size_t)xcap_sizeof) != 915 (ssize_t)xcap_sizeof) { 916 file_badread(ms); 917 return -1; 918 } 919 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 920 switch (xcap_tag) { 921 case CA_SUNW_NULL: 922 break; 923 case CA_SUNW_HW_1: 924 cap_hw1 |= xcap_val; 925 break; 926 case CA_SUNW_SF_1: 927 cap_sf1 |= xcap_val; 928 break; 929 default: 930 if (file_printf(ms, 931 ", with unknown capability " 932 "0x%llx = 0x%llx", 933 (unsigned long long)xcap_tag, 934 (unsigned long long)xcap_val) == -1) 935 return -1; 936 break; 937 } 938 } 939 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 940 file_badread(ms); 941 return -1; 942 } 943 break; 944 } 945 } 946 } 947 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 948 return -1; 949 if (cap_hw1) { 950 const cap_desc_t *cdp; 951 switch (mach) { 952 case EM_SPARC: 953 case EM_SPARC32PLUS: 954 case EM_SPARCV9: 955 cdp = cap_desc_sparc; 956 break; 957 case EM_386: 958 case EM_IA_64: 959 case EM_AMD64: 960 cdp = cap_desc_386; 961 break; 962 default: 963 cdp = NULL; 964 break; 965 } 966 if (file_printf(ms, ", uses") == -1) 967 return -1; 968 if (cdp) { 969 while (cdp->cd_name) { 970 if (cap_hw1 & cdp->cd_mask) { 971 if (file_printf(ms, 972 " %s", cdp->cd_name) == -1) 973 return -1; 974 cap_hw1 &= ~cdp->cd_mask; 975 } 976 ++cdp; 977 } 978 if (cap_hw1) 979 if (file_printf(ms, 980 " unknown hardware capability 0x%llx", 981 (unsigned long long)cap_hw1) == -1) 982 return -1; 983 } else { 984 if (file_printf(ms, 985 " hardware capability 0x%llx", 986 (unsigned long long)cap_hw1) == -1) 987 return -1; 988 } 989 } 990 if (cap_sf1) { 991 if (cap_sf1 & SF1_SUNW_FPUSED) { 992 if (file_printf(ms, 993 (cap_sf1 & SF1_SUNW_FPKNWN) 994 ? ", uses frame pointer" 995 : ", not known to use frame pointer") == -1) 996 return -1; 997 } 998 cap_sf1 &= ~SF1_SUNW_MASK; 999 if (cap_sf1) 1000 if (file_printf(ms, 1001 ", with unknown software capability 0x%llx", 1002 (unsigned long long)cap_sf1) == -1) 1003 return -1; 1004 } 1005 return 0; 1006 } 1007 1008 /* 1009 * Look through the program headers of an executable image, searching 1010 * for a PT_INTERP section; if one is found, it's dynamically linked, 1011 * otherwise it's statically linked. 1012 */ 1013 private int 1014 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1015 int num, size_t size, off_t fsize, int *flags, int sh_num) 1016 { 1017 Elf32_Phdr ph32; 1018 Elf64_Phdr ph64; 1019 const char *linking_style = "statically"; 1020 const char *shared_libraries = ""; 1021 unsigned char nbuf[BUFSIZ]; 1022 int bufsize; 1023 size_t offset, align; 1024 off_t savedoffset = (off_t)-1; 1025 struct stat st; 1026 1027 if (fstat(fd, &st) < 0) { 1028 file_badread(ms); 1029 return -1; 1030 } 1031 1032 if (size != xph_sizeof) { 1033 if (file_printf(ms, ", corrupted program header size") == -1) 1034 return -1; 1035 return 0; 1036 } 1037 1038 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 1039 file_badseek(ms); 1040 return -1; 1041 } 1042 1043 for ( ; num; num--) { 1044 if (read(fd, xph_addr, xph_sizeof) == -1) { 1045 file_badread(ms); 1046 return -1; 1047 } 1048 if (xph_offset > st.st_size && savedoffset != (off_t)-1) { 1049 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1050 file_badseek(ms); 1051 return -1; 1052 } 1053 continue; 1054 } 1055 1056 if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) { 1057 file_badseek(ms); 1058 return -1; 1059 } 1060 1061 if (xph_offset > fsize) { 1062 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1063 file_badseek(ms); 1064 return -1; 1065 } 1066 continue; 1067 } 1068 1069 switch (xph_type) { 1070 case PT_DYNAMIC: 1071 linking_style = "dynamically"; 1072 break; 1073 case PT_INTERP: 1074 shared_libraries = " (uses shared libs)"; 1075 break; 1076 case PT_NOTE: 1077 if ((align = xph_align) & 0x80000000) { 1078 if (file_printf(ms, 1079 ", invalid note alignment 0x%lx", 1080 (unsigned long)align) == -1) 1081 return -1; 1082 align = 4; 1083 } 1084 if (sh_num) 1085 break; 1086 /* 1087 * This is a PT_NOTE section; loop through all the notes 1088 * in the section. 1089 */ 1090 if (lseek(fd, xph_offset, SEEK_SET) 1091 == (off_t)-1) { 1092 file_badseek(ms); 1093 return -1; 1094 } 1095 bufsize = read(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ? 1096 xph_filesz : sizeof(nbuf))); 1097 if (bufsize == -1) { 1098 file_badread(ms); 1099 return -1; 1100 } 1101 offset = 0; 1102 for (;;) { 1103 if (offset >= (size_t)bufsize) 1104 break; 1105 offset = donote(ms, nbuf, offset, 1106 (size_t)bufsize, clazz, swap, align, 1107 flags); 1108 if (offset == 0) 1109 break; 1110 } 1111 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1112 file_badseek(ms); 1113 return -1; 1114 } 1115 break; 1116 default: 1117 break; 1118 } 1119 } 1120 if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries) 1121 == -1) 1122 return -1; 1123 return 0; 1124 } 1125 1126 1127 protected int 1128 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, 1129 size_t nbytes) 1130 { 1131 union { 1132 int32_t l; 1133 char c[sizeof (int32_t)]; 1134 } u; 1135 int clazz; 1136 int swap; 1137 struct stat st; 1138 off_t fsize; 1139 int flags = 0; 1140 Elf32_Ehdr elf32hdr; 1141 Elf64_Ehdr elf64hdr; 1142 uint16_t type; 1143 1144 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) 1145 return 0; 1146 /* 1147 * ELF executables have multiple section headers in arbitrary 1148 * file locations and thus file(1) cannot determine it from easily. 1149 * Instead we traverse thru all section headers until a symbol table 1150 * one is found or else the binary is stripped. 1151 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1152 */ 1153 if (buf[EI_MAG0] != ELFMAG0 1154 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1155 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1156 return 0; 1157 1158 /* 1159 * If we cannot seek, it must be a pipe, socket or fifo. 1160 */ 1161 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1162 fd = file_pipe2file(ms, fd, buf, nbytes); 1163 1164 if (fstat(fd, &st) == -1) { 1165 file_badread(ms); 1166 return -1; 1167 } 1168 fsize = st.st_size; 1169 1170 clazz = buf[EI_CLASS]; 1171 1172 switch (clazz) { 1173 case ELFCLASS32: 1174 #undef elf_getu 1175 #define elf_getu(a, b) elf_getu32(a, b) 1176 #undef elfhdr 1177 #define elfhdr elf32hdr 1178 #include "elfclass.h" 1179 case ELFCLASS64: 1180 #undef elf_getu 1181 #define elf_getu(a, b) elf_getu64(a, b) 1182 #undef elfhdr 1183 #define elfhdr elf64hdr 1184 #include "elfclass.h" 1185 default: 1186 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1187 return -1; 1188 break; 1189 } 1190 return 0; 1191 } 1192 #endif 1193