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 1.90 2011/08/23 08:01:12 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, 51 off_t, int *, 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 (off_t)(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 0x01 287 #define FLAGS_DID_NOTE 0x02 288 #define FLAGS_DID_BUILD_ID 0x04 289 #define FLAGS_DID_CORE_STYLE 0x08 290 #define FLAGS_IS_CORE 0x10 291 292 private int 293 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 294 int num, size_t size, off_t fsize, int *flags) 295 { 296 Elf32_Phdr ph32; 297 Elf64_Phdr ph64; 298 size_t offset; 299 unsigned char nbuf[BUFSIZ]; 300 ssize_t bufsize; 301 302 if (size != xph_sizeof) { 303 if (file_printf(ms, ", corrupted program header size") == -1) 304 return -1; 305 return 0; 306 } 307 308 /* 309 * Loop through all the program headers. 310 */ 311 for ( ; num; num--) { 312 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 313 file_badseek(ms); 314 return -1; 315 } 316 if (read(fd, xph_addr, xph_sizeof) == -1) { 317 file_badread(ms); 318 return -1; 319 } 320 off += size; 321 322 if (xph_offset > fsize) { 323 /* Perhaps warn here */ 324 continue; 325 } 326 327 if (xph_type != PT_NOTE) 328 continue; 329 330 /* 331 * This is a PT_NOTE section; loop through all the notes 332 * in the section. 333 */ 334 if (lseek(fd, xph_offset, SEEK_SET) == (off_t)-1) { 335 file_badseek(ms); 336 return -1; 337 } 338 bufsize = read(fd, nbuf, 339 ((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf))); 340 if (bufsize == -1) { 341 file_badread(ms); 342 return -1; 343 } 344 offset = 0; 345 for (;;) { 346 if (offset >= (size_t)bufsize) 347 break; 348 offset = donote(ms, nbuf, offset, (size_t)bufsize, 349 clazz, swap, 4, flags); 350 if (offset == 0) 351 break; 352 353 } 354 } 355 return 0; 356 } 357 #endif 358 359 private size_t 360 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 361 int clazz, int swap, size_t align, int *flags) 362 { 363 Elf32_Nhdr nh32; 364 Elf64_Nhdr nh64; 365 size_t noff, doff; 366 #ifdef ELFCORE 367 int os_style = -1; 368 #endif 369 uint32_t namesz, descsz; 370 unsigned char *nbuf = CAST(unsigned char *, vbuf); 371 372 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 373 offset += xnh_sizeof; 374 375 namesz = xnh_namesz; 376 descsz = xnh_descsz; 377 if ((namesz == 0) && (descsz == 0)) { 378 /* 379 * We're out of note headers. 380 */ 381 return (offset >= size) ? offset : size; 382 } 383 384 if (namesz & 0x80000000) { 385 (void)file_printf(ms, ", bad note name size 0x%lx", 386 (unsigned long)namesz); 387 return offset; 388 } 389 390 if (descsz & 0x80000000) { 391 (void)file_printf(ms, ", bad note description size 0x%lx", 392 (unsigned long)descsz); 393 return offset; 394 } 395 396 397 noff = offset; 398 doff = ELF_ALIGN(offset + namesz); 399 400 if (offset + namesz > size) { 401 /* 402 * We're past the end of the buffer. 403 */ 404 return doff; 405 } 406 407 offset = ELF_ALIGN(doff + descsz); 408 if (doff + descsz > size) { 409 /* 410 * We're past the end of the buffer. 411 */ 412 return (offset >= size) ? offset : size; 413 } 414 415 if ((*flags & (FLAGS_DID_NOTE|FLAGS_DID_BUILD_ID)) == 416 (FLAGS_DID_NOTE|FLAGS_DID_BUILD_ID)) 417 goto core; 418 419 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 420 xnh_type == NT_GNU_VERSION && descsz == 16) { 421 uint32_t desc[4]; 422 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 423 424 if (file_printf(ms, ", for GNU/") == -1) 425 return size; 426 switch (elf_getu32(swap, desc[0])) { 427 case GNU_OS_LINUX: 428 if (file_printf(ms, "Linux") == -1) 429 return size; 430 break; 431 case GNU_OS_HURD: 432 if (file_printf(ms, "Hurd") == -1) 433 return size; 434 break; 435 case GNU_OS_SOLARIS: 436 if (file_printf(ms, "Solaris") == -1) 437 return size; 438 break; 439 case GNU_OS_KFREEBSD: 440 if (file_printf(ms, "kFreeBSD") == -1) 441 return size; 442 break; 443 case GNU_OS_KNETBSD: 444 if (file_printf(ms, "kNetBSD") == -1) 445 return size; 446 break; 447 default: 448 if (file_printf(ms, "<unknown>") == -1) 449 return size; 450 } 451 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 452 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 453 return size; 454 *flags |= FLAGS_DID_NOTE; 455 return size; 456 } 457 458 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 459 xnh_type == NT_GNU_BUILD_ID && (descsz == 16 || descsz == 20)) { 460 uint32_t desc[5], i; 461 if (file_printf(ms, ", BuildID[%s]=0x", descsz == 16 ? "md5/uuid" : 462 "sha1") == -1) 463 return size; 464 (void)memcpy(desc, &nbuf[doff], descsz); 465 for (i = 0; i < descsz >> 2; i++) 466 if (file_printf(ms, "%.8x", desc[i]) == -1) 467 return size; 468 *flags |= FLAGS_DID_BUILD_ID; 469 } 470 471 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 && 472 xnh_type == NT_NETBSD_VERSION && descsz == 4) { 473 uint32_t desc; 474 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 475 desc = elf_getu32(swap, desc); 476 477 if (file_printf(ms, ", for NetBSD") == -1) 478 return size; 479 /* 480 * The version number used to be stuck as 199905, and was thus 481 * basically content-free. Newer versions of NetBSD have fixed 482 * this and now use the encoding of __NetBSD_Version__: 483 * 484 * MMmmrrpp00 485 * 486 * M = major version 487 * m = minor version 488 * r = release ["",A-Z,Z[A-Z] but numeric] 489 * p = patchlevel 490 */ 491 if (desc > 100000000U) { 492 uint32_t ver_patch = (desc / 100) % 100; 493 uint32_t ver_rel = (desc / 10000) % 100; 494 uint32_t ver_min = (desc / 1000000) % 100; 495 uint32_t ver_maj = desc / 100000000; 496 497 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 498 return size; 499 if (ver_rel == 0 && ver_patch != 0) { 500 if (file_printf(ms, ".%u", ver_patch) == -1) 501 return size; 502 } else if (ver_rel != 0) { 503 while (ver_rel > 26) { 504 if (file_printf(ms, "Z") == -1) 505 return size; 506 ver_rel -= 26; 507 } 508 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 509 == -1) 510 return size; 511 } 512 } 513 *flags |= FLAGS_DID_NOTE; 514 return size; 515 } 516 517 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 && 518 xnh_type == NT_FREEBSD_VERSION && descsz == 4) { 519 uint32_t desc; 520 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 521 desc = elf_getu32(swap, desc); 522 if (file_printf(ms, ", for FreeBSD") == -1) 523 return size; 524 525 /* 526 * Contents is __FreeBSD_version, whose relation to OS 527 * versions is defined by a huge table in the Porter's 528 * Handbook. This is the general scheme: 529 * 530 * Releases: 531 * Mmp000 (before 4.10) 532 * Mmi0p0 (before 5.0) 533 * Mmm0p0 534 * 535 * Development branches: 536 * Mmpxxx (before 4.6) 537 * Mmp1xx (before 4.10) 538 * Mmi1xx (before 5.0) 539 * M000xx (pre-M.0) 540 * Mmm1xx 541 * 542 * M = major version 543 * m = minor version 544 * i = minor version increment (491000 -> 4.10) 545 * p = patchlevel 546 * x = revision 547 * 548 * The first release of FreeBSD to use ELF by default 549 * was version 3.0. 550 */ 551 if (desc == 460002) { 552 if (file_printf(ms, " 4.6.2") == -1) 553 return size; 554 } else if (desc < 460100) { 555 if (file_printf(ms, " %d.%d", desc / 100000, 556 desc / 10000 % 10) == -1) 557 return size; 558 if (desc / 1000 % 10 > 0) 559 if (file_printf(ms, ".%d", desc / 1000 % 10) 560 == -1) 561 return size; 562 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 563 if (file_printf(ms, " (%d)", desc) == -1) 564 return size; 565 } else if (desc < 500000) { 566 if (file_printf(ms, " %d.%d", desc / 100000, 567 desc / 10000 % 10 + desc / 1000 % 10) == -1) 568 return size; 569 if (desc / 100 % 10 > 0) { 570 if (file_printf(ms, " (%d)", desc) == -1) 571 return size; 572 } else if (desc / 10 % 10 > 0) { 573 if (file_printf(ms, ".%d", desc / 10 % 10) 574 == -1) 575 return size; 576 } 577 } else { 578 if (file_printf(ms, " %d.%d", desc / 100000, 579 desc / 1000 % 100) == -1) 580 return size; 581 if ((desc / 100 % 10 > 0) || 582 (desc % 100000 / 100 == 0)) { 583 if (file_printf(ms, " (%d)", desc) == -1) 584 return size; 585 } else if (desc / 10 % 10 > 0) { 586 if (file_printf(ms, ".%d", desc / 10 % 10) 587 == -1) 588 return size; 589 } 590 } 591 *flags |= FLAGS_DID_NOTE; 592 return size; 593 } 594 595 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && 596 xnh_type == NT_OPENBSD_VERSION && descsz == 4) { 597 if (file_printf(ms, ", for OpenBSD") == -1) 598 return size; 599 /* Content of note is always 0 */ 600 *flags |= FLAGS_DID_NOTE; 601 return size; 602 } 603 604 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && 605 xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) { 606 uint32_t desc; 607 if (file_printf(ms, ", for DragonFly") == -1) 608 return size; 609 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 610 desc = elf_getu32(swap, desc); 611 if (file_printf(ms, " %d.%d.%d", desc / 100000, 612 desc / 10000 % 10, desc % 10000) == -1) 613 return size; 614 *flags |= FLAGS_DID_NOTE; 615 return size; 616 } 617 618 core: 619 /* 620 * Sigh. The 2.0.36 kernel in Debian 2.1, at 621 * least, doesn't correctly implement name 622 * sections, in core dumps, as specified by 623 * the "Program Linking" section of "UNIX(R) System 624 * V Release 4 Programmer's Guide: ANSI C and 625 * Programming Support Tools", because my copy 626 * clearly says "The first 'namesz' bytes in 'name' 627 * contain a *null-terminated* [emphasis mine] 628 * character representation of the entry's owner 629 * or originator", but the 2.0.36 kernel code 630 * doesn't include the terminating null in the 631 * name.... 632 */ 633 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || 634 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { 635 os_style = OS_STYLE_SVR4; 636 } 637 638 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { 639 os_style = OS_STYLE_FREEBSD; 640 } 641 642 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) 643 == 0)) { 644 os_style = OS_STYLE_NETBSD; 645 } 646 647 #ifdef ELFCORE 648 if ((*flags & FLAGS_DID_CORE) != 0) 649 return size; 650 651 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 652 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 653 == -1) 654 return size; 655 *flags |= FLAGS_DID_CORE_STYLE; 656 } 657 658 switch (os_style) { 659 case OS_STYLE_NETBSD: 660 if (xnh_type == NT_NETBSD_CORE_PROCINFO) { 661 uint32_t signo; 662 /* 663 * Extract the program name. It is at 664 * offset 0x7c, and is up to 32-bytes, 665 * including the terminating NUL. 666 */ 667 if (file_printf(ms, ", from '%.31s'", 668 &nbuf[doff + 0x7c]) == -1) 669 return size; 670 671 /* 672 * Extract the signal number. It is at 673 * offset 0x08. 674 */ 675 (void)memcpy(&signo, &nbuf[doff + 0x08], 676 sizeof(signo)); 677 if (file_printf(ms, " (signal %u)", 678 elf_getu32(swap, signo)) == -1) 679 return size; 680 *flags |= FLAGS_DID_CORE; 681 return size; 682 } 683 break; 684 685 default: 686 if (xnh_type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 687 size_t i, j; 688 unsigned char c; 689 /* 690 * Extract the program name. We assume 691 * it to be 16 characters (that's what it 692 * is in SunOS 5.x and Linux). 693 * 694 * Unfortunately, it's at a different offset 695 * in various OSes, so try multiple offsets. 696 * If the characters aren't all printable, 697 * reject it. 698 */ 699 for (i = 0; i < NOFFSETS; i++) { 700 unsigned char *cname, *cp; 701 size_t reloffset = prpsoffsets(i); 702 size_t noffset = doff + reloffset; 703 size_t k; 704 for (j = 0; j < 16; j++, noffset++, 705 reloffset++) { 706 /* 707 * Make sure we're not past 708 * the end of the buffer; if 709 * we are, just give up. 710 */ 711 if (noffset >= size) 712 goto tryanother; 713 714 /* 715 * Make sure we're not past 716 * the end of the contents; 717 * if we are, this obviously 718 * isn't the right offset. 719 */ 720 if (reloffset >= descsz) 721 goto tryanother; 722 723 c = nbuf[noffset]; 724 if (c == '\0') { 725 /* 726 * A '\0' at the 727 * beginning is 728 * obviously wrong. 729 * Any other '\0' 730 * means we're done. 731 */ 732 if (j == 0) 733 goto tryanother; 734 else 735 break; 736 } else { 737 /* 738 * A nonprintable 739 * character is also 740 * wrong. 741 */ 742 if (!isprint(c) || isquote(c)) 743 goto tryanother; 744 } 745 } 746 /* 747 * Well, that worked. 748 */ 749 750 /* 751 * Try next offsets, in case this match is 752 * in the middle of a string. 753 */ 754 for (k = i + 1 ; k < NOFFSETS ; k++) { 755 size_t no; 756 int adjust = 1; 757 if (prpsoffsets(k) >= prpsoffsets(i)) 758 continue; 759 for (no = doff + prpsoffsets(k); 760 no < doff + prpsoffsets(i); no++) 761 adjust = adjust 762 && isprint(nbuf[no]); 763 if (adjust) 764 i = k; 765 } 766 767 cname = (unsigned char *) 768 &nbuf[doff + prpsoffsets(i)]; 769 for (cp = cname; *cp && isprint(*cp); cp++) 770 continue; 771 /* 772 * Linux apparently appends a space at the end 773 * of the command line: remove it. 774 */ 775 while (cp > cname && isspace(cp[-1])) 776 cp--; 777 if (file_printf(ms, ", from '%.*s'", 778 (int)(cp - cname), cname) == -1) 779 return size; 780 *flags |= FLAGS_DID_CORE; 781 return size; 782 783 tryanother: 784 ; 785 } 786 } 787 break; 788 } 789 #endif 790 return offset; 791 } 792 793 /* SunOS 5.x hardware capability descriptions */ 794 typedef struct cap_desc { 795 uint64_t cd_mask; 796 const char *cd_name; 797 } cap_desc_t; 798 799 static const cap_desc_t cap_desc_sparc[] = { 800 { AV_SPARC_MUL32, "MUL32" }, 801 { AV_SPARC_DIV32, "DIV32" }, 802 { AV_SPARC_FSMULD, "FSMULD" }, 803 { AV_SPARC_V8PLUS, "V8PLUS" }, 804 { AV_SPARC_POPC, "POPC" }, 805 { AV_SPARC_VIS, "VIS" }, 806 { AV_SPARC_VIS2, "VIS2" }, 807 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 808 { AV_SPARC_FMAF, "FMAF" }, 809 { AV_SPARC_FJFMAU, "FJFMAU" }, 810 { AV_SPARC_IMA, "IMA" }, 811 { 0, NULL } 812 }; 813 814 static const cap_desc_t cap_desc_386[] = { 815 { AV_386_FPU, "FPU" }, 816 { AV_386_TSC, "TSC" }, 817 { AV_386_CX8, "CX8" }, 818 { AV_386_SEP, "SEP" }, 819 { AV_386_AMD_SYSC, "AMD_SYSC" }, 820 { AV_386_CMOV, "CMOV" }, 821 { AV_386_MMX, "MMX" }, 822 { AV_386_AMD_MMX, "AMD_MMX" }, 823 { AV_386_AMD_3DNow, "AMD_3DNow" }, 824 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 825 { AV_386_FXSR, "FXSR" }, 826 { AV_386_SSE, "SSE" }, 827 { AV_386_SSE2, "SSE2" }, 828 { AV_386_PAUSE, "PAUSE" }, 829 { AV_386_SSE3, "SSE3" }, 830 { AV_386_MON, "MON" }, 831 { AV_386_CX16, "CX16" }, 832 { AV_386_AHF, "AHF" }, 833 { AV_386_TSCP, "TSCP" }, 834 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 835 { AV_386_POPCNT, "POPCNT" }, 836 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 837 { AV_386_SSSE3, "SSSE3" }, 838 { AV_386_SSE4_1, "SSE4.1" }, 839 { AV_386_SSE4_2, "SSE4.2" }, 840 { 0, NULL } 841 }; 842 843 private int 844 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 845 size_t size, off_t fsize, int *flags, int mach) 846 { 847 Elf32_Shdr sh32; 848 Elf64_Shdr sh64; 849 int stripped = 1; 850 void *nbuf; 851 off_t noff, coff; 852 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */ 853 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */ 854 855 if (size != xsh_sizeof) { 856 if (file_printf(ms, ", corrupted section header size") == -1) 857 return -1; 858 return 0; 859 } 860 861 for ( ; num; num--) { 862 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 863 file_badseek(ms); 864 return -1; 865 } 866 if (read(fd, xsh_addr, xsh_sizeof) == -1) { 867 file_badread(ms); 868 return -1; 869 } 870 off += size; 871 872 /* Things we can determine before we seek */ 873 switch (xsh_type) { 874 case SHT_SYMTAB: 875 #if 0 876 case SHT_DYNSYM: 877 #endif 878 stripped = 0; 879 break; 880 default: 881 if (xsh_offset > fsize) { 882 /* Perhaps warn here */ 883 continue; 884 } 885 break; 886 } 887 888 /* Things we can determine when we seek */ 889 switch (xsh_type) { 890 case SHT_NOTE: 891 if ((nbuf = malloc((size_t)xsh_size)) == NULL) { 892 file_error(ms, errno, "Cannot allocate memory" 893 " for note"); 894 return -1; 895 } 896 if ((noff = lseek(fd, (off_t)xsh_offset, SEEK_SET)) == 897 (off_t)-1) { 898 file_badread(ms); 899 free(nbuf); 900 return -1; 901 } 902 if (read(fd, nbuf, (size_t)xsh_size) != 903 (ssize_t)xsh_size) { 904 free(nbuf); 905 file_badread(ms); 906 return -1; 907 } 908 909 noff = 0; 910 for (;;) { 911 if (noff >= (off_t)xsh_size) 912 break; 913 noff = donote(ms, nbuf, (size_t)noff, 914 (size_t)xsh_size, clazz, swap, 4, 915 flags); 916 if (noff == 0) 917 break; 918 } 919 free(nbuf); 920 break; 921 case SHT_SUNW_cap: 922 if (lseek(fd, (off_t)xsh_offset, SEEK_SET) == 923 (off_t)-1) { 924 file_badseek(ms); 925 return -1; 926 } 927 coff = 0; 928 for (;;) { 929 Elf32_Cap cap32; 930 Elf64_Cap cap64; 931 char cbuf[/*CONSTCOND*/ 932 MAX(sizeof cap32, sizeof cap64)]; 933 if ((coff += xcap_sizeof) > (off_t)xsh_size) 934 break; 935 if (read(fd, cbuf, (size_t)xcap_sizeof) != 936 (ssize_t)xcap_sizeof) { 937 file_badread(ms); 938 return -1; 939 } 940 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 941 switch (xcap_tag) { 942 case CA_SUNW_NULL: 943 break; 944 case CA_SUNW_HW_1: 945 cap_hw1 |= xcap_val; 946 break; 947 case CA_SUNW_SF_1: 948 cap_sf1 |= xcap_val; 949 break; 950 default: 951 if (file_printf(ms, 952 ", with unknown capability " 953 "0x%" INT64_T_FORMAT "x = 0x%" 954 INT64_T_FORMAT "x", 955 (unsigned long long)xcap_tag, 956 (unsigned long long)xcap_val) == -1) 957 return -1; 958 break; 959 } 960 } 961 break; 962 963 default: 964 break; 965 } 966 } 967 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 968 return -1; 969 if (cap_hw1) { 970 const cap_desc_t *cdp; 971 switch (mach) { 972 case EM_SPARC: 973 case EM_SPARC32PLUS: 974 case EM_SPARCV9: 975 cdp = cap_desc_sparc; 976 break; 977 case EM_386: 978 case EM_IA_64: 979 case EM_AMD64: 980 cdp = cap_desc_386; 981 break; 982 default: 983 cdp = NULL; 984 break; 985 } 986 if (file_printf(ms, ", uses") == -1) 987 return -1; 988 if (cdp) { 989 while (cdp->cd_name) { 990 if (cap_hw1 & cdp->cd_mask) { 991 if (file_printf(ms, 992 " %s", cdp->cd_name) == -1) 993 return -1; 994 cap_hw1 &= ~cdp->cd_mask; 995 } 996 ++cdp; 997 } 998 if (cap_hw1) 999 if (file_printf(ms, 1000 " unknown hardware capability 0x%" 1001 INT64_T_FORMAT "x", 1002 (unsigned long long)cap_hw1) == -1) 1003 return -1; 1004 } else { 1005 if (file_printf(ms, 1006 " hardware capability 0x%" INT64_T_FORMAT "x", 1007 (unsigned long long)cap_hw1) == -1) 1008 return -1; 1009 } 1010 } 1011 if (cap_sf1) { 1012 if (cap_sf1 & SF1_SUNW_FPUSED) { 1013 if (file_printf(ms, 1014 (cap_sf1 & SF1_SUNW_FPKNWN) 1015 ? ", uses frame pointer" 1016 : ", not known to use frame pointer") == -1) 1017 return -1; 1018 } 1019 cap_sf1 &= ~SF1_SUNW_MASK; 1020 if (cap_sf1) 1021 if (file_printf(ms, 1022 ", with unknown software capability 0x%" 1023 INT64_T_FORMAT "x", 1024 (unsigned long long)cap_sf1) == -1) 1025 return -1; 1026 } 1027 return 0; 1028 } 1029 1030 /* 1031 * Look through the program headers of an executable image, searching 1032 * for a PT_INTERP section; if one is found, it's dynamically linked, 1033 * otherwise it's statically linked. 1034 */ 1035 private int 1036 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1037 int num, size_t size, off_t fsize, int *flags, int sh_num) 1038 { 1039 Elf32_Phdr ph32; 1040 Elf64_Phdr ph64; 1041 const char *linking_style = "statically"; 1042 const char *shared_libraries = ""; 1043 unsigned char nbuf[BUFSIZ]; 1044 ssize_t bufsize; 1045 size_t offset, align; 1046 1047 if (size != xph_sizeof) { 1048 if (file_printf(ms, ", corrupted program header size") == -1) 1049 return -1; 1050 return 0; 1051 } 1052 1053 for ( ; num; num--) { 1054 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 1055 file_badseek(ms); 1056 return -1; 1057 } 1058 1059 if (read(fd, xph_addr, xph_sizeof) == -1) { 1060 file_badread(ms); 1061 return -1; 1062 } 1063 1064 off += size; 1065 1066 /* Things we can determine before we seek */ 1067 switch (xph_type) { 1068 case PT_DYNAMIC: 1069 linking_style = "dynamically"; 1070 break; 1071 case PT_INTERP: 1072 shared_libraries = " (uses shared libs)"; 1073 break; 1074 default: 1075 if (xph_offset > fsize) { 1076 /* Maybe warn here? */ 1077 continue; 1078 } 1079 break; 1080 } 1081 1082 /* Things we can determine when we seek */ 1083 switch (xph_type) { 1084 case PT_NOTE: 1085 if ((align = xph_align) & 0x80000000UL) { 1086 if (file_printf(ms, 1087 ", invalid note alignment 0x%lx", 1088 (unsigned long)align) == -1) 1089 return -1; 1090 align = 4; 1091 } 1092 if (sh_num) 1093 break; 1094 /* 1095 * This is a PT_NOTE section; loop through all the notes 1096 * in the section. 1097 */ 1098 if (lseek(fd, xph_offset, SEEK_SET) == (off_t)-1) { 1099 file_badseek(ms); 1100 return -1; 1101 } 1102 bufsize = read(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ? 1103 xph_filesz : sizeof(nbuf))); 1104 if (bufsize == -1) { 1105 file_badread(ms); 1106 return -1; 1107 } 1108 offset = 0; 1109 for (;;) { 1110 if (offset >= (size_t)bufsize) 1111 break; 1112 offset = donote(ms, nbuf, offset, 1113 (size_t)bufsize, clazz, swap, align, 1114 flags); 1115 if (offset == 0) 1116 break; 1117 } 1118 break; 1119 default: 1120 break; 1121 } 1122 } 1123 if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries) 1124 == -1) 1125 return -1; 1126 return 0; 1127 } 1128 1129 1130 protected int 1131 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, 1132 size_t nbytes) 1133 { 1134 union { 1135 int32_t l; 1136 char c[sizeof (int32_t)]; 1137 } u; 1138 int clazz; 1139 int swap; 1140 struct stat st; 1141 off_t fsize; 1142 int flags = 0; 1143 Elf32_Ehdr elf32hdr; 1144 Elf64_Ehdr elf64hdr; 1145 uint16_t type; 1146 1147 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) 1148 return 0; 1149 /* 1150 * ELF executables have multiple section headers in arbitrary 1151 * file locations and thus file(1) cannot determine it from easily. 1152 * Instead we traverse thru all section headers until a symbol table 1153 * one is found or else the binary is stripped. 1154 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1155 */ 1156 if (buf[EI_MAG0] != ELFMAG0 1157 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1158 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1159 return 0; 1160 1161 /* 1162 * If we cannot seek, it must be a pipe, socket or fifo. 1163 */ 1164 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1165 fd = file_pipe2file(ms, fd, buf, nbytes); 1166 1167 if (fstat(fd, &st) == -1) { 1168 file_badread(ms); 1169 return -1; 1170 } 1171 fsize = st.st_size; 1172 1173 clazz = buf[EI_CLASS]; 1174 1175 switch (clazz) { 1176 case ELFCLASS32: 1177 #undef elf_getu 1178 #define elf_getu(a, b) elf_getu32(a, b) 1179 #undef elfhdr 1180 #define elfhdr elf32hdr 1181 #include "elfclass.h" 1182 case ELFCLASS64: 1183 #undef elf_getu 1184 #define elf_getu(a, b) elf_getu64(a, b) 1185 #undef elfhdr 1186 #define elfhdr elf64hdr 1187 #include "elfclass.h" 1188 default: 1189 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1190 return -1; 1191 break; 1192 } 1193 return 0; 1194 } 1195 #endif 1196