1 /* $NetBSD: readelf.c,v 1.3 2011/05/13 01:52:13 christos Exp $ */ 2 3 /* 4 * Copyright (c) Christos Zoulas 2003. 5 * All Rights Reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice immediately at the beginning of the file, without modification, 12 * this list of conditions, and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 #include "file.h" 30 31 #ifndef lint 32 #if 0 33 FILE_RCSID("@(#)$File: readelf.c,v 1.86 2010/07/21 16:47:18 christos Exp $") 34 #else 35 __RCSID("$NetBSD: readelf.c,v 1.3 2011/05/13 01:52:13 christos Exp $"); 36 #endif 37 #endif 38 39 #ifdef BUILTIN_ELF 40 #include <string.h> 41 #include <ctype.h> 42 #include <stdlib.h> 43 #ifdef HAVE_UNISTD_H 44 #include <unistd.h> 45 #endif 46 47 #include "readelf.h" 48 #include "magic.h" 49 50 #ifdef ELFCORE 51 private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t, 52 off_t, int *); 53 #endif 54 private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t, 55 off_t, int *, int); 56 private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, int *, 57 int); 58 private size_t donote(struct magic_set *, void *, size_t, size_t, int, 59 int, size_t, int *); 60 61 #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) 62 63 #define isquote(c) (strchr("'\"`", (c)) != NULL) 64 65 private uint16_t getu16(int, uint16_t); 66 private uint32_t getu32(int, uint32_t); 67 private uint64_t getu64(int, uint64_t); 68 69 private uint16_t 70 getu16(int swap, uint16_t value) 71 { 72 union { 73 uint16_t ui; 74 char c[2]; 75 } retval, tmpval; 76 77 if (swap) { 78 tmpval.ui = value; 79 80 retval.c[0] = tmpval.c[1]; 81 retval.c[1] = tmpval.c[0]; 82 83 return retval.ui; 84 } else 85 return value; 86 } 87 88 private uint32_t 89 getu32(int swap, uint32_t value) 90 { 91 union { 92 uint32_t ui; 93 char c[4]; 94 } retval, tmpval; 95 96 if (swap) { 97 tmpval.ui = value; 98 99 retval.c[0] = tmpval.c[3]; 100 retval.c[1] = tmpval.c[2]; 101 retval.c[2] = tmpval.c[1]; 102 retval.c[3] = tmpval.c[0]; 103 104 return retval.ui; 105 } else 106 return value; 107 } 108 109 private uint64_t 110 getu64(int swap, uint64_t value) 111 { 112 union { 113 uint64_t ui; 114 char c[8]; 115 } retval, tmpval; 116 117 if (swap) { 118 tmpval.ui = value; 119 120 retval.c[0] = tmpval.c[7]; 121 retval.c[1] = tmpval.c[6]; 122 retval.c[2] = tmpval.c[5]; 123 retval.c[3] = tmpval.c[4]; 124 retval.c[4] = tmpval.c[3]; 125 retval.c[5] = tmpval.c[2]; 126 retval.c[6] = tmpval.c[1]; 127 retval.c[7] = tmpval.c[0]; 128 129 return retval.ui; 130 } else 131 return value; 132 } 133 134 #define elf_getu16(swap, value) getu16(swap, value) 135 #define elf_getu32(swap, value) getu32(swap, value) 136 #ifdef USE_ARRAY_FOR_64BIT_TYPES 137 # define elf_getu64(swap, array) \ 138 ((swap ? ((uint64_t)elf_getu32(swap, array[0])) << 32 : elf_getu32(swap, array[0])) + \ 139 (swap ? elf_getu32(swap, array[1]) : ((uint64_t)elf_getu32(swap, array[1]) << 32))) 140 #else 141 # define elf_getu64(swap, value) getu64(swap, value) 142 #endif 143 144 #define xsh_addr (clazz == ELFCLASS32 \ 145 ? (void *) &sh32 \ 146 : (void *) &sh64) 147 #define xsh_sizeof (clazz == ELFCLASS32 \ 148 ? sizeof sh32 \ 149 : sizeof sh64) 150 #define xsh_size (clazz == ELFCLASS32 \ 151 ? elf_getu32(swap, sh32.sh_size) \ 152 : elf_getu64(swap, sh64.sh_size)) 153 #define xsh_offset (clazz == ELFCLASS32 \ 154 ? elf_getu32(swap, sh32.sh_offset) \ 155 : elf_getu64(swap, sh64.sh_offset)) 156 #define xsh_type (clazz == ELFCLASS32 \ 157 ? elf_getu32(swap, sh32.sh_type) \ 158 : elf_getu32(swap, sh64.sh_type)) 159 #define xph_addr (clazz == ELFCLASS32 \ 160 ? (void *) &ph32 \ 161 : (void *) &ph64) 162 #define xph_sizeof (clazz == ELFCLASS32 \ 163 ? sizeof ph32 \ 164 : sizeof ph64) 165 #define xph_type (clazz == ELFCLASS32 \ 166 ? elf_getu32(swap, ph32.p_type) \ 167 : elf_getu32(swap, ph64.p_type)) 168 #define xph_offset (off_t)(clazz == ELFCLASS32 \ 169 ? elf_getu32(swap, ph32.p_offset) \ 170 : elf_getu64(swap, ph64.p_offset)) 171 #define xph_align (size_t)((clazz == ELFCLASS32 \ 172 ? (off_t) (ph32.p_align ? \ 173 elf_getu32(swap, ph32.p_align) : 4) \ 174 : (off_t) (ph64.p_align ? \ 175 elf_getu64(swap, ph64.p_align) : 4))) 176 #define xph_filesz (size_t)((clazz == ELFCLASS32 \ 177 ? elf_getu32(swap, ph32.p_filesz) \ 178 : elf_getu64(swap, ph64.p_filesz))) 179 #define xnh_addr (clazz == ELFCLASS32 \ 180 ? (void *) &nh32 \ 181 : (void *) &nh64) 182 #define xph_memsz (size_t)((clazz == ELFCLASS32 \ 183 ? elf_getu32(swap, ph32.p_memsz) \ 184 : elf_getu64(swap, ph64.p_memsz))) 185 #define xnh_sizeof (clazz == ELFCLASS32 \ 186 ? sizeof nh32 \ 187 : sizeof nh64) 188 #define xnh_type (clazz == ELFCLASS32 \ 189 ? elf_getu32(swap, nh32.n_type) \ 190 : elf_getu32(swap, nh64.n_type)) 191 #define xnh_namesz (clazz == ELFCLASS32 \ 192 ? elf_getu32(swap, nh32.n_namesz) \ 193 : elf_getu32(swap, nh64.n_namesz)) 194 #define xnh_descsz (clazz == ELFCLASS32 \ 195 ? elf_getu32(swap, nh32.n_descsz) \ 196 : elf_getu32(swap, nh64.n_descsz)) 197 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 198 ? prpsoffsets32[i] \ 199 : prpsoffsets64[i]) 200 #define xcap_addr (clazz == ELFCLASS32 \ 201 ? (void *) &cap32 \ 202 : (void *) &cap64) 203 #define xcap_sizeof (clazz == ELFCLASS32 \ 204 ? sizeof cap32 \ 205 : sizeof cap64) 206 #define xcap_tag (clazz == ELFCLASS32 \ 207 ? elf_getu32(swap, cap32.c_tag) \ 208 : elf_getu64(swap, cap64.c_tag)) 209 #define xcap_val (clazz == ELFCLASS32 \ 210 ? elf_getu32(swap, cap32.c_un.c_val) \ 211 : elf_getu64(swap, cap64.c_un.c_val)) 212 213 #ifdef ELFCORE 214 /* 215 * Try larger offsets first to avoid false matches 216 * from earlier data that happen to look like strings. 217 */ 218 static const size_t prpsoffsets32[] = { 219 #ifdef USE_NT_PSINFO 220 104, /* SunOS 5.x (command line) */ 221 88, /* SunOS 5.x (short name) */ 222 #endif /* USE_NT_PSINFO */ 223 224 100, /* SunOS 5.x (command line) */ 225 84, /* SunOS 5.x (short name) */ 226 227 44, /* Linux (command line) */ 228 28, /* Linux 2.0.36 (short name) */ 229 230 8, /* FreeBSD */ 231 }; 232 233 static const size_t prpsoffsets64[] = { 234 #ifdef USE_NT_PSINFO 235 152, /* SunOS 5.x (command line) */ 236 136, /* SunOS 5.x (short name) */ 237 #endif /* USE_NT_PSINFO */ 238 239 136, /* SunOS 5.x, 64-bit (command line) */ 240 120, /* SunOS 5.x, 64-bit (short name) */ 241 242 56, /* Linux (command line) */ 243 40, /* Linux (tested on core from 2.4.x, short name) */ 244 245 16, /* FreeBSD, 64-bit */ 246 }; 247 248 #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0]) 249 #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0]) 250 251 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 252 253 /* 254 * Look through the program headers of an executable image, searching 255 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 256 * "FreeBSD"; if one is found, try looking in various places in its 257 * contents for a 16-character string containing only printable 258 * characters - if found, that string should be the name of the program 259 * that dropped core. Note: right after that 16-character string is, 260 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 261 * Linux, a longer string (80 characters, in 5.x, probably other 262 * SVR4-flavored systems, and Linux) containing the start of the 263 * command line for that program. 264 * 265 * SunOS 5.x core files contain two PT_NOTE sections, with the types 266 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 267 * same info about the command name and command line, so it probably 268 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 269 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 270 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 271 * the SunOS 5.x file command relies on this (and prefers the latter). 272 * 273 * The signal number probably appears in a section of type NT_PRSTATUS, 274 * but that's also rather OS-dependent, in ways that are harder to 275 * dissect with heuristics, so I'm not bothering with the signal number. 276 * (I suppose the signal number could be of interest in situations where 277 * you don't have the binary of the program that dropped core; if you 278 * *do* have that binary, the debugger will probably tell you what 279 * signal it was.) 280 */ 281 282 #define OS_STYLE_SVR4 0 283 #define OS_STYLE_FREEBSD 1 284 #define OS_STYLE_NETBSD 2 285 286 private const char os_style_names[][8] = { 287 "SVR4", 288 "FreeBSD", 289 "NetBSD", 290 }; 291 292 #define FLAGS_DID_CORE 1 293 #define FLAGS_DID_NOTE 2 294 #define FLAGS_DID_CORE_STYLE 4 295 #define FLAGS_IS_CORE 8 296 297 private int 298 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 299 int num, size_t size, off_t fsize, int *flags) 300 { 301 Elf32_Phdr ph32; 302 Elf64_Phdr ph64; 303 size_t offset; 304 unsigned char nbuf[BUFSIZ]; 305 ssize_t bufsize; 306 off_t savedoffset; 307 struct stat st; 308 309 if (fstat(fd, &st) < 0) { 310 file_badread(ms); 311 return -1; 312 } 313 314 if (size != xph_sizeof) { 315 if (file_printf(ms, ", corrupted program header size") == -1) 316 return -1; 317 return 0; 318 } 319 320 /* 321 * Loop through all the program headers. 322 */ 323 for ( ; num; num--) { 324 if ((savedoffset = lseek(fd, off, SEEK_SET)) == (off_t)-1) { 325 file_badseek(ms); 326 return -1; 327 } 328 if (read(fd, xph_addr, xph_sizeof) == -1) { 329 file_badread(ms); 330 return -1; 331 } 332 if (xph_offset > fsize) { 333 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 334 file_badseek(ms); 335 return -1; 336 } 337 continue; 338 } 339 340 off += size; 341 if (xph_type != PT_NOTE) 342 continue; 343 344 /* 345 * This is a PT_NOTE section; loop through all the notes 346 * in the section. 347 */ 348 if (lseek(fd, xph_offset, SEEK_SET) == (off_t)-1) { 349 file_badseek(ms); 350 return -1; 351 } 352 bufsize = read(fd, nbuf, 353 ((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf))); 354 if (bufsize == -1) { 355 file_badread(ms); 356 return -1; 357 } 358 offset = 0; 359 for (;;) { 360 if (offset >= (size_t)bufsize) 361 break; 362 offset = donote(ms, nbuf, offset, (size_t)bufsize, 363 clazz, swap, 4, flags); 364 if (offset == 0) 365 break; 366 367 } 368 } 369 return 0; 370 } 371 #endif 372 373 private size_t 374 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 375 int clazz, int swap, size_t align, int *flags) 376 { 377 Elf32_Nhdr nh32; 378 Elf64_Nhdr nh64; 379 size_t noff, doff; 380 #ifdef ELFCORE 381 int os_style = -1; 382 #endif 383 uint32_t namesz, descsz; 384 unsigned char *nbuf = CAST(unsigned char *, vbuf); 385 386 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 387 offset += xnh_sizeof; 388 389 namesz = xnh_namesz; 390 descsz = xnh_descsz; 391 if ((namesz == 0) && (descsz == 0)) { 392 /* 393 * We're out of note headers. 394 */ 395 return (offset >= size) ? offset : size; 396 } 397 398 if (namesz & 0x80000000) { 399 (void)file_printf(ms, ", bad note name size 0x%lx", 400 (unsigned long)namesz); 401 return offset; 402 } 403 404 if (descsz & 0x80000000) { 405 (void)file_printf(ms, ", bad note description size 0x%lx", 406 (unsigned long)descsz); 407 return offset; 408 } 409 410 411 noff = offset; 412 doff = ELF_ALIGN(offset + namesz); 413 414 if (offset + namesz > size) { 415 /* 416 * We're past the end of the buffer. 417 */ 418 return doff; 419 } 420 421 offset = ELF_ALIGN(doff + descsz); 422 if (doff + descsz > size) { 423 /* 424 * We're past the end of the buffer. 425 */ 426 return (offset >= size) ? offset : size; 427 } 428 429 if (*flags & FLAGS_DID_NOTE) 430 goto core; 431 432 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 433 xnh_type == NT_GNU_VERSION && descsz == 16) { 434 uint32_t desc[4]; 435 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 436 437 if (file_printf(ms, ", for GNU/") == -1) 438 return size; 439 switch (elf_getu32(swap, desc[0])) { 440 case GNU_OS_LINUX: 441 if (file_printf(ms, "Linux") == -1) 442 return size; 443 break; 444 case GNU_OS_HURD: 445 if (file_printf(ms, "Hurd") == -1) 446 return size; 447 break; 448 case GNU_OS_SOLARIS: 449 if (file_printf(ms, "Solaris") == -1) 450 return size; 451 break; 452 case GNU_OS_KFREEBSD: 453 if (file_printf(ms, "kFreeBSD") == -1) 454 return size; 455 break; 456 case GNU_OS_KNETBSD: 457 if (file_printf(ms, "kNetBSD") == -1) 458 return size; 459 break; 460 default: 461 if (file_printf(ms, "<unknown>") == -1) 462 return size; 463 } 464 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 465 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 466 return size; 467 *flags |= FLAGS_DID_NOTE; 468 return size; 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, int *flags, int mach) 846 { 847 Elf32_Shdr sh32; 848 Elf64_Shdr sh64; 849 int stripped = 1; 850 void *nbuf; 851 off_t noff; 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 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 862 file_badseek(ms); 863 return -1; 864 } 865 866 for ( ; num; num--) { 867 if (read(fd, xsh_addr, xsh_sizeof) == -1) { 868 file_badread(ms); 869 return -1; 870 } 871 switch (xsh_type) { 872 case SHT_SYMTAB: 873 #if 0 874 case SHT_DYNSYM: 875 #endif 876 stripped = 0; 877 break; 878 case SHT_NOTE: 879 if ((off = lseek(fd, (off_t)0, SEEK_CUR)) == 880 (off_t)-1) { 881 file_badread(ms); 882 return -1; 883 } 884 if ((nbuf = malloc((size_t)xsh_size)) == NULL) { 885 file_error(ms, errno, "Cannot allocate memory" 886 " for note"); 887 return -1; 888 } 889 if ((noff = lseek(fd, (off_t)xsh_offset, SEEK_SET)) == 890 (off_t)-1) { 891 file_badread(ms); 892 free(nbuf); 893 return -1; 894 } 895 if (read(fd, nbuf, (size_t)xsh_size) != 896 (ssize_t)xsh_size) { 897 free(nbuf); 898 file_badread(ms); 899 return -1; 900 } 901 902 noff = 0; 903 for (;;) { 904 if (noff >= (off_t)xsh_size) 905 break; 906 noff = donote(ms, nbuf, (size_t)noff, 907 (size_t)xsh_size, clazz, swap, 4, 908 flags); 909 if (noff == 0) 910 break; 911 } 912 if ((lseek(fd, off, SEEK_SET)) == (off_t)-1) { 913 free(nbuf); 914 file_badread(ms); 915 return -1; 916 } 917 free(nbuf); 918 break; 919 case SHT_SUNW_cap: 920 { 921 off_t coff; 922 if ((off = lseek(fd, (off_t)0, SEEK_CUR)) == 923 (off_t)-1) { 924 file_badread(ms); 925 return -1; 926 } 927 if (lseek(fd, (off_t)xsh_offset, SEEK_SET) == 928 (off_t)-1) { 929 file_badread(ms); 930 return -1; 931 } 932 coff = 0; 933 for (;;) { 934 Elf32_Cap cap32; 935 Elf64_Cap cap64; 936 char cbuf[/*CONSTCOND*/ 937 MAX(sizeof cap32, sizeof cap64)]; 938 if ((coff += xcap_sizeof) > (off_t)xsh_size) 939 break; 940 if (read(fd, cbuf, (size_t)xcap_sizeof) != 941 (ssize_t)xcap_sizeof) { 942 file_badread(ms); 943 return -1; 944 } 945 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 946 switch (xcap_tag) { 947 case CA_SUNW_NULL: 948 break; 949 case CA_SUNW_HW_1: 950 cap_hw1 |= xcap_val; 951 break; 952 case CA_SUNW_SF_1: 953 cap_sf1 |= xcap_val; 954 break; 955 default: 956 if (file_printf(ms, 957 ", with unknown capability " 958 "0x%" INT64_T_FORMAT "x = 0x%" 959 INT64_T_FORMAT "x", 960 (unsigned long long)xcap_tag, 961 (unsigned long long)xcap_val) == -1) 962 return -1; 963 break; 964 } 965 } 966 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 967 file_badread(ms); 968 return -1; 969 } 970 break; 971 } 972 } 973 } 974 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 975 return -1; 976 if (cap_hw1) { 977 const cap_desc_t *cdp; 978 switch (mach) { 979 case EM_SPARC: 980 case EM_SPARC32PLUS: 981 case EM_SPARCV9: 982 cdp = cap_desc_sparc; 983 break; 984 case EM_386: 985 case EM_IA_64: 986 case EM_AMD64: 987 cdp = cap_desc_386; 988 break; 989 default: 990 cdp = NULL; 991 break; 992 } 993 if (file_printf(ms, ", uses") == -1) 994 return -1; 995 if (cdp) { 996 while (cdp->cd_name) { 997 if (cap_hw1 & cdp->cd_mask) { 998 if (file_printf(ms, 999 " %s", cdp->cd_name) == -1) 1000 return -1; 1001 cap_hw1 &= ~cdp->cd_mask; 1002 } 1003 ++cdp; 1004 } 1005 if (cap_hw1) 1006 if (file_printf(ms, 1007 " unknown hardware capability 0x%" 1008 INT64_T_FORMAT "x", 1009 (unsigned long long)cap_hw1) == -1) 1010 return -1; 1011 } else { 1012 if (file_printf(ms, 1013 " hardware capability 0x%" INT64_T_FORMAT "x", 1014 (unsigned long long)cap_hw1) == -1) 1015 return -1; 1016 } 1017 } 1018 if (cap_sf1) { 1019 if (cap_sf1 & SF1_SUNW_FPUSED) { 1020 if (file_printf(ms, 1021 (cap_sf1 & SF1_SUNW_FPKNWN) 1022 ? ", uses frame pointer" 1023 : ", not known to use frame pointer") == -1) 1024 return -1; 1025 } 1026 cap_sf1 &= ~SF1_SUNW_MASK; 1027 if (cap_sf1) 1028 if (file_printf(ms, 1029 ", with unknown software capability 0x%" 1030 INT64_T_FORMAT "x", 1031 (unsigned long long)cap_sf1) == -1) 1032 return -1; 1033 } 1034 return 0; 1035 } 1036 1037 /* 1038 * Look through the program headers of an executable image, searching 1039 * for a PT_INTERP section; if one is found, it's dynamically linked, 1040 * otherwise it's statically linked. 1041 */ 1042 private int 1043 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1044 int num, size_t size, off_t fsize, int *flags, int sh_num) 1045 { 1046 Elf32_Phdr ph32; 1047 Elf64_Phdr ph64; 1048 const char *linking_style = "statically"; 1049 const char *shared_libraries = ""; 1050 unsigned char nbuf[BUFSIZ]; 1051 ssize_t bufsize; 1052 size_t offset, align; 1053 off_t savedoffset = (off_t)-1; 1054 struct stat st; 1055 1056 if (fstat(fd, &st) < 0) { 1057 file_badread(ms); 1058 return -1; 1059 } 1060 1061 if (size != xph_sizeof) { 1062 if (file_printf(ms, ", corrupted program header size") == -1) 1063 return -1; 1064 return 0; 1065 } 1066 1067 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 1068 file_badseek(ms); 1069 return -1; 1070 } 1071 1072 for ( ; num; num--) { 1073 if (read(fd, xph_addr, xph_sizeof) == -1) { 1074 file_badread(ms); 1075 return -1; 1076 } 1077 if (xph_offset > st.st_size && savedoffset != (off_t)-1) { 1078 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1079 file_badseek(ms); 1080 return -1; 1081 } 1082 continue; 1083 } 1084 1085 if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) { 1086 file_badseek(ms); 1087 return -1; 1088 } 1089 1090 if (xph_offset > fsize) { 1091 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1092 file_badseek(ms); 1093 return -1; 1094 } 1095 continue; 1096 } 1097 1098 switch (xph_type) { 1099 case PT_DYNAMIC: 1100 linking_style = "dynamically"; 1101 break; 1102 case PT_INTERP: 1103 shared_libraries = " (uses shared libs)"; 1104 break; 1105 case PT_NOTE: 1106 if ((align = xph_align) & 0x80000000UL) { 1107 if (file_printf(ms, 1108 ", invalid note alignment 0x%lx", 1109 (unsigned long)align) == -1) 1110 return -1; 1111 align = 4; 1112 } 1113 if (sh_num) 1114 break; 1115 /* 1116 * This is a PT_NOTE section; loop through all the notes 1117 * in the section. 1118 */ 1119 if (lseek(fd, xph_offset, SEEK_SET) 1120 == (off_t)-1) { 1121 file_badseek(ms); 1122 return -1; 1123 } 1124 bufsize = read(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ? 1125 xph_filesz : sizeof(nbuf))); 1126 if (bufsize == -1) { 1127 file_badread(ms); 1128 return -1; 1129 } 1130 offset = 0; 1131 for (;;) { 1132 if (offset >= (size_t)bufsize) 1133 break; 1134 offset = donote(ms, nbuf, offset, 1135 (size_t)bufsize, clazz, swap, align, 1136 flags); 1137 if (offset == 0) 1138 break; 1139 } 1140 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1141 file_badseek(ms); 1142 return -1; 1143 } 1144 break; 1145 default: 1146 break; 1147 } 1148 } 1149 if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries) 1150 == -1) 1151 return -1; 1152 return 0; 1153 } 1154 1155 1156 protected int 1157 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, 1158 size_t nbytes) 1159 { 1160 union { 1161 int32_t l; 1162 char c[sizeof (int32_t)]; 1163 } u; 1164 int clazz; 1165 int swap; 1166 struct stat st; 1167 off_t fsize; 1168 int flags = 0; 1169 Elf32_Ehdr elf32hdr; 1170 Elf64_Ehdr elf64hdr; 1171 uint16_t type; 1172 1173 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) 1174 return 0; 1175 /* 1176 * ELF executables have multiple section headers in arbitrary 1177 * file locations and thus file(1) cannot determine it from easily. 1178 * Instead we traverse thru all section headers until a symbol table 1179 * one is found or else the binary is stripped. 1180 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1181 */ 1182 if (buf[EI_MAG0] != ELFMAG0 1183 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1184 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1185 return 0; 1186 1187 /* 1188 * If we cannot seek, it must be a pipe, socket or fifo. 1189 */ 1190 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1191 fd = file_pipe2file(ms, fd, buf, nbytes); 1192 1193 if (fstat(fd, &st) == -1) { 1194 file_badread(ms); 1195 return -1; 1196 } 1197 fsize = st.st_size; 1198 1199 clazz = buf[EI_CLASS]; 1200 1201 switch (clazz) { 1202 case ELFCLASS32: 1203 #undef elf_getu 1204 #define elf_getu(a, b) elf_getu32(a, b) 1205 #undef elfhdr 1206 #define elfhdr elf32hdr 1207 #include "elfclass.h" 1208 case ELFCLASS64: 1209 #undef elf_getu 1210 #define elf_getu(a, b) elf_getu64(a, b) 1211 #undef elfhdr 1212 #define elfhdr elf64hdr 1213 #include "elfclass.h" 1214 default: 1215 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1216 return -1; 1217 break; 1218 } 1219 return 0; 1220 } 1221 #endif 1222