1 /* $NetBSD: readelf.c,v 1.2 2009/05/08 17:28:01 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 1.81 2008/11/04 16:38:28 christos Exp $") 34 #else 35 __RCSID("$NetBSD: readelf.c,v 1.2 2009/05/08 17:28:01 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 4 295 296 private int 297 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 298 int num, size_t size, off_t fsize, int *flags) 299 { 300 Elf32_Phdr ph32; 301 Elf64_Phdr ph64; 302 size_t offset; 303 unsigned char nbuf[BUFSIZ]; 304 ssize_t bufsize; 305 off_t savedoffset; 306 struct stat st; 307 308 if (fstat(fd, &st) < 0) { 309 file_badread(ms); 310 return -1; 311 } 312 313 if (size != xph_sizeof) { 314 if (file_printf(ms, ", corrupted program header size") == -1) 315 return -1; 316 return 0; 317 } 318 319 /* 320 * Loop through all the program headers. 321 */ 322 for ( ; num; num--) { 323 if ((savedoffset = lseek(fd, off, SEEK_SET)) == (off_t)-1) { 324 file_badseek(ms); 325 return -1; 326 } 327 if (read(fd, xph_addr, xph_sizeof) == -1) { 328 file_badread(ms); 329 return -1; 330 } 331 if (xph_offset > fsize) { 332 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 333 file_badseek(ms); 334 return -1; 335 } 336 continue; 337 } 338 339 off += size; 340 if (xph_type != PT_NOTE) 341 continue; 342 343 /* 344 * This is a PT_NOTE section; loop through all the notes 345 * in the section. 346 */ 347 if (lseek(fd, xph_offset, SEEK_SET) == (off_t)-1) { 348 file_badseek(ms); 349 return -1; 350 } 351 bufsize = read(fd, nbuf, 352 ((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf))); 353 if (bufsize == -1) { 354 file_badread(ms); 355 return -1; 356 } 357 offset = 0; 358 for (;;) { 359 if (offset >= (size_t)bufsize) 360 break; 361 offset = donote(ms, nbuf, offset, (size_t)bufsize, 362 clazz, swap, 4, flags); 363 if (offset == 0) 364 break; 365 366 } 367 } 368 return 0; 369 } 370 #endif 371 372 private size_t 373 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 374 int clazz, int swap, size_t align, int *flags) 375 { 376 Elf32_Nhdr nh32; 377 Elf64_Nhdr nh64; 378 size_t noff, doff; 379 #ifdef ELFCORE 380 int os_style = -1; 381 #endif 382 uint32_t namesz, descsz; 383 unsigned char *nbuf = CAST(unsigned char *, vbuf); 384 385 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 386 offset += xnh_sizeof; 387 388 namesz = xnh_namesz; 389 descsz = xnh_descsz; 390 if ((namesz == 0) && (descsz == 0)) { 391 /* 392 * We're out of note headers. 393 */ 394 return (offset >= size) ? offset : size; 395 } 396 397 if (namesz & 0x80000000) { 398 (void)file_printf(ms, ", bad note name size 0x%lx", 399 (unsigned long)namesz); 400 return offset; 401 } 402 403 if (descsz & 0x80000000) { 404 (void)file_printf(ms, ", bad note description size 0x%lx", 405 (unsigned long)descsz); 406 return offset; 407 } 408 409 410 noff = offset; 411 doff = ELF_ALIGN(offset + namesz); 412 413 if (offset + namesz > size) { 414 /* 415 * We're past the end of the buffer. 416 */ 417 return doff; 418 } 419 420 offset = ELF_ALIGN(doff + descsz); 421 if (doff + descsz > size) { 422 /* 423 * We're past the end of the buffer. 424 */ 425 return (offset >= size) ? offset : size; 426 } 427 428 if (*flags & FLAGS_DID_NOTE) 429 goto core; 430 431 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 432 xnh_type == NT_GNU_VERSION && descsz == 16) { 433 uint32_t desc[4]; 434 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 435 436 if (file_printf(ms, ", for GNU/") == -1) 437 return size; 438 switch (elf_getu32(swap, desc[0])) { 439 case GNU_OS_LINUX: 440 if (file_printf(ms, "Linux") == -1) 441 return size; 442 break; 443 case GNU_OS_HURD: 444 if (file_printf(ms, "Hurd") == -1) 445 return size; 446 break; 447 case GNU_OS_SOLARIS: 448 if (file_printf(ms, "Solaris") == -1) 449 return size; 450 break; 451 case GNU_OS_KFREEBSD: 452 if (file_printf(ms, "kFreeBSD") == -1) 453 return size; 454 break; 455 case GNU_OS_KNETBSD: 456 if (file_printf(ms, "kNetBSD") == -1) 457 return size; 458 break; 459 default: 460 if (file_printf(ms, "<unknown>") == -1) 461 return size; 462 } 463 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 464 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 465 return size; 466 *flags |= FLAGS_DID_NOTE; 467 return size; 468 } 469 470 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 && 471 xnh_type == NT_NETBSD_VERSION && descsz == 4) { 472 uint32_t desc; 473 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 474 desc = elf_getu32(swap, desc); 475 476 if (file_printf(ms, ", for NetBSD") == -1) 477 return size; 478 /* 479 * The version number used to be stuck as 199905, and was thus 480 * basically content-free. Newer versions of NetBSD have fixed 481 * this and now use the encoding of __NetBSD_Version__: 482 * 483 * MMmmrrpp00 484 * 485 * M = major version 486 * m = minor version 487 * r = release ["",A-Z,Z[A-Z] but numeric] 488 * p = patchlevel 489 */ 490 if (desc > 100000000U) { 491 uint32_t ver_patch = (desc / 100) % 100; 492 uint32_t ver_rel = (desc / 10000) % 100; 493 uint32_t ver_min = (desc / 1000000) % 100; 494 uint32_t ver_maj = desc / 100000000; 495 496 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 497 return size; 498 if (ver_rel == 0 && ver_patch != 0) { 499 if (file_printf(ms, ".%u", ver_patch) == -1) 500 return size; 501 } else if (ver_rel != 0) { 502 while (ver_rel > 26) { 503 if (file_printf(ms, "Z") == -1) 504 return size; 505 ver_rel -= 26; 506 } 507 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 508 == -1) 509 return size; 510 } 511 } 512 *flags |= FLAGS_DID_NOTE; 513 return size; 514 } 515 516 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 && 517 xnh_type == NT_FREEBSD_VERSION && descsz == 4) { 518 uint32_t desc; 519 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 520 desc = elf_getu32(swap, desc); 521 if (file_printf(ms, ", for FreeBSD") == -1) 522 return size; 523 524 /* 525 * Contents is __FreeBSD_version, whose relation to OS 526 * versions is defined by a huge table in the Porter's 527 * Handbook. This is the general scheme: 528 * 529 * Releases: 530 * Mmp000 (before 4.10) 531 * Mmi0p0 (before 5.0) 532 * Mmm0p0 533 * 534 * Development branches: 535 * Mmpxxx (before 4.6) 536 * Mmp1xx (before 4.10) 537 * Mmi1xx (before 5.0) 538 * M000xx (pre-M.0) 539 * Mmm1xx 540 * 541 * M = major version 542 * m = minor version 543 * i = minor version increment (491000 -> 4.10) 544 * p = patchlevel 545 * x = revision 546 * 547 * The first release of FreeBSD to use ELF by default 548 * was version 3.0. 549 */ 550 if (desc == 460002) { 551 if (file_printf(ms, " 4.6.2") == -1) 552 return size; 553 } else if (desc < 460100) { 554 if (file_printf(ms, " %d.%d", desc / 100000, 555 desc / 10000 % 10) == -1) 556 return size; 557 if (desc / 1000 % 10 > 0) 558 if (file_printf(ms, ".%d", desc / 1000 % 10) 559 == -1) 560 return size; 561 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 562 if (file_printf(ms, " (%d)", desc) == -1) 563 return size; 564 } else if (desc < 500000) { 565 if (file_printf(ms, " %d.%d", desc / 100000, 566 desc / 10000 % 10 + desc / 1000 % 10) == -1) 567 return size; 568 if (desc / 100 % 10 > 0) { 569 if (file_printf(ms, " (%d)", desc) == -1) 570 return size; 571 } else if (desc / 10 % 10 > 0) { 572 if (file_printf(ms, ".%d", desc / 10 % 10) 573 == -1) 574 return size; 575 } 576 } else { 577 if (file_printf(ms, " %d.%d", desc / 100000, 578 desc / 1000 % 100) == -1) 579 return size; 580 if ((desc / 100 % 10 > 0) || 581 (desc % 100000 / 100 == 0)) { 582 if (file_printf(ms, " (%d)", desc) == -1) 583 return size; 584 } else if (desc / 10 % 10 > 0) { 585 if (file_printf(ms, ".%d", desc / 10 % 10) 586 == -1) 587 return size; 588 } 589 } 590 *flags |= FLAGS_DID_NOTE; 591 return size; 592 } 593 594 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && 595 xnh_type == NT_OPENBSD_VERSION && descsz == 4) { 596 if (file_printf(ms, ", for OpenBSD") == -1) 597 return size; 598 /* Content of note is always 0 */ 599 *flags |= FLAGS_DID_NOTE; 600 return size; 601 } 602 603 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && 604 xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) { 605 uint32_t desc; 606 if (file_printf(ms, ", for DragonFly") == -1) 607 return size; 608 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 609 desc = elf_getu32(swap, desc); 610 if (file_printf(ms, " %d.%d.%d", desc / 100000, 611 desc / 10000 % 10, desc % 10000) == -1) 612 return size; 613 *flags |= FLAGS_DID_NOTE; 614 return size; 615 } 616 617 core: 618 /* 619 * Sigh. The 2.0.36 kernel in Debian 2.1, at 620 * least, doesn't correctly implement name 621 * sections, in core dumps, as specified by 622 * the "Program Linking" section of "UNIX(R) System 623 * V Release 4 Programmer's Guide: ANSI C and 624 * Programming Support Tools", because my copy 625 * clearly says "The first 'namesz' bytes in 'name' 626 * contain a *null-terminated* [emphasis mine] 627 * character representation of the entry's owner 628 * or originator", but the 2.0.36 kernel code 629 * doesn't include the terminating null in the 630 * name.... 631 */ 632 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || 633 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { 634 os_style = OS_STYLE_SVR4; 635 } 636 637 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { 638 os_style = OS_STYLE_FREEBSD; 639 } 640 641 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) 642 == 0)) { 643 os_style = OS_STYLE_NETBSD; 644 } 645 646 #ifdef ELFCORE 647 if ((*flags & FLAGS_DID_CORE) != 0) 648 return size; 649 650 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 651 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 652 == -1) 653 return size; 654 *flags |= FLAGS_DID_CORE_STYLE; 655 } 656 657 switch (os_style) { 658 case OS_STYLE_NETBSD: 659 if (xnh_type == NT_NETBSD_CORE_PROCINFO) { 660 uint32_t signo; 661 /* 662 * Extract the program name. It is at 663 * offset 0x7c, and is up to 32-bytes, 664 * including the terminating NUL. 665 */ 666 if (file_printf(ms, ", from '%.31s'", 667 &nbuf[doff + 0x7c]) == -1) 668 return size; 669 670 /* 671 * Extract the signal number. It is at 672 * offset 0x08. 673 */ 674 (void)memcpy(&signo, &nbuf[doff + 0x08], 675 sizeof(signo)); 676 if (file_printf(ms, " (signal %u)", 677 elf_getu32(swap, signo)) == -1) 678 return size; 679 *flags |= FLAGS_DID_CORE; 680 return size; 681 } 682 break; 683 684 default: 685 if (xnh_type == NT_PRPSINFO) { 686 size_t i, j; 687 unsigned char c; 688 /* 689 * Extract the program name. We assume 690 * it to be 16 characters (that's what it 691 * is in SunOS 5.x and Linux). 692 * 693 * Unfortunately, it's at a different offset 694 * in various OSes, so try multiple offsets. 695 * If the characters aren't all printable, 696 * reject it. 697 */ 698 for (i = 0; i < NOFFSETS; i++) { 699 unsigned char *cname, *cp; 700 size_t reloffset = prpsoffsets(i); 701 size_t noffset = doff + reloffset; 702 for (j = 0; j < 16; j++, noffset++, 703 reloffset++) { 704 /* 705 * Make sure we're not past 706 * the end of the buffer; if 707 * we are, just give up. 708 */ 709 if (noffset >= size) 710 goto tryanother; 711 712 /* 713 * Make sure we're not past 714 * the end of the contents; 715 * if we are, this obviously 716 * isn't the right offset. 717 */ 718 if (reloffset >= descsz) 719 goto tryanother; 720 721 c = nbuf[noffset]; 722 if (c == '\0') { 723 /* 724 * A '\0' at the 725 * beginning is 726 * obviously wrong. 727 * Any other '\0' 728 * means we're done. 729 */ 730 if (j == 0) 731 goto tryanother; 732 else 733 break; 734 } else { 735 /* 736 * A nonprintable 737 * character is also 738 * wrong. 739 */ 740 if (!isprint(c) || isquote(c)) 741 goto tryanother; 742 } 743 } 744 /* 745 * Well, that worked. 746 */ 747 cname = (unsigned char *) 748 &nbuf[doff + prpsoffsets(i)]; 749 for (cp = cname; *cp && isprint(*cp); cp++) 750 continue; 751 /* 752 * Linux apparently appends a space at the end 753 * of the command line: remove it. 754 */ 755 while (cp > cname && isspace(cp[-1])) 756 cp--; 757 if (file_printf(ms, ", from '%.*s'", 758 (int)(cp - cname), cname) == -1) 759 return size; 760 *flags |= FLAGS_DID_CORE; 761 return size; 762 763 tryanother: 764 ; 765 } 766 } 767 break; 768 } 769 #endif 770 return offset; 771 } 772 773 /* SunOS 5.x hardware capability descriptions */ 774 typedef struct cap_desc { 775 uint64_t cd_mask; 776 const char *cd_name; 777 } cap_desc_t; 778 779 static const cap_desc_t cap_desc_sparc[] = { 780 { AV_SPARC_MUL32, "MUL32" }, 781 { AV_SPARC_DIV32, "DIV32" }, 782 { AV_SPARC_FSMULD, "FSMULD" }, 783 { AV_SPARC_V8PLUS, "V8PLUS" }, 784 { AV_SPARC_POPC, "POPC" }, 785 { AV_SPARC_VIS, "VIS" }, 786 { AV_SPARC_VIS2, "VIS2" }, 787 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 788 { AV_SPARC_FMAF, "FMAF" }, 789 { AV_SPARC_FJFMAU, "FJFMAU" }, 790 { AV_SPARC_IMA, "IMA" }, 791 { 0, NULL } 792 }; 793 794 static const cap_desc_t cap_desc_386[] = { 795 { AV_386_FPU, "FPU" }, 796 { AV_386_TSC, "TSC" }, 797 { AV_386_CX8, "CX8" }, 798 { AV_386_SEP, "SEP" }, 799 { AV_386_AMD_SYSC, "AMD_SYSC" }, 800 { AV_386_CMOV, "CMOV" }, 801 { AV_386_MMX, "MMX" }, 802 { AV_386_AMD_MMX, "AMD_MMX" }, 803 { AV_386_AMD_3DNow, "AMD_3DNow" }, 804 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 805 { AV_386_FXSR, "FXSR" }, 806 { AV_386_SSE, "SSE" }, 807 { AV_386_SSE2, "SSE2" }, 808 { AV_386_PAUSE, "PAUSE" }, 809 { AV_386_SSE3, "SSE3" }, 810 { AV_386_MON, "MON" }, 811 { AV_386_CX16, "CX16" }, 812 { AV_386_AHF, "AHF" }, 813 { AV_386_TSCP, "TSCP" }, 814 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 815 { AV_386_POPCNT, "POPCNT" }, 816 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 817 { AV_386_SSSE3, "SSSE3" }, 818 { AV_386_SSE4_1, "SSE4.1" }, 819 { AV_386_SSE4_2, "SSE4.2" }, 820 { 0, NULL } 821 }; 822 823 private int 824 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 825 size_t size, int *flags, int mach) 826 { 827 Elf32_Shdr sh32; 828 Elf64_Shdr sh64; 829 int stripped = 1; 830 void *nbuf; 831 off_t noff; 832 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */ 833 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */ 834 835 if (size != xsh_sizeof) { 836 if (file_printf(ms, ", corrupted section header size") == -1) 837 return -1; 838 return 0; 839 } 840 841 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 842 file_badseek(ms); 843 return -1; 844 } 845 846 for ( ; num; num--) { 847 if (read(fd, xsh_addr, xsh_sizeof) == -1) { 848 file_badread(ms); 849 return -1; 850 } 851 switch (xsh_type) { 852 case SHT_SYMTAB: 853 #if 0 854 case SHT_DYNSYM: 855 #endif 856 stripped = 0; 857 break; 858 case SHT_NOTE: 859 if ((off = lseek(fd, (off_t)0, SEEK_CUR)) == 860 (off_t)-1) { 861 file_badread(ms); 862 return -1; 863 } 864 if ((nbuf = malloc((size_t)xsh_size)) == NULL) { 865 file_error(ms, errno, "Cannot allocate memory" 866 " for note"); 867 return -1; 868 } 869 if ((noff = lseek(fd, (off_t)xsh_offset, SEEK_SET)) == 870 (off_t)-1) { 871 file_badread(ms); 872 free(nbuf); 873 return -1; 874 } 875 if (read(fd, nbuf, (size_t)xsh_size) != 876 (ssize_t)xsh_size) { 877 free(nbuf); 878 file_badread(ms); 879 return -1; 880 } 881 882 noff = 0; 883 for (;;) { 884 if (noff >= (off_t)xsh_size) 885 break; 886 noff = donote(ms, nbuf, (size_t)noff, 887 (size_t)xsh_size, clazz, swap, 4, 888 flags); 889 if (noff == 0) 890 break; 891 } 892 if ((lseek(fd, off, SEEK_SET)) == (off_t)-1) { 893 free(nbuf); 894 file_badread(ms); 895 return -1; 896 } 897 free(nbuf); 898 break; 899 case SHT_SUNW_cap: 900 { 901 off_t coff; 902 if ((off = lseek(fd, (off_t)0, SEEK_CUR)) == 903 (off_t)-1) { 904 file_badread(ms); 905 return -1; 906 } 907 if (lseek(fd, (off_t)xsh_offset, SEEK_SET) == 908 (off_t)-1) { 909 file_badread(ms); 910 return -1; 911 } 912 coff = 0; 913 for (;;) { 914 Elf32_Cap cap32; 915 Elf64_Cap cap64; 916 char cbuf[/*CONSTCOND*/ 917 MAX(sizeof cap32, sizeof cap64)]; 918 if ((coff += xcap_sizeof) >= (off_t)xsh_size) 919 break; 920 if (read(fd, cbuf, (size_t)xcap_sizeof) != 921 (ssize_t)xcap_sizeof) { 922 file_badread(ms); 923 return -1; 924 } 925 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 926 switch (xcap_tag) { 927 case CA_SUNW_NULL: 928 break; 929 case CA_SUNW_HW_1: 930 cap_hw1 |= xcap_val; 931 break; 932 case CA_SUNW_SF_1: 933 cap_sf1 |= xcap_val; 934 break; 935 default: 936 if (file_printf(ms, 937 ", with unknown capability " 938 "0x%llx = 0x%llx", 939 (unsigned long long)xcap_tag, 940 (unsigned long long)xcap_val) == -1) 941 return -1; 942 break; 943 } 944 } 945 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 946 file_badread(ms); 947 return -1; 948 } 949 break; 950 } 951 } 952 } 953 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 954 return -1; 955 if (cap_hw1) { 956 const cap_desc_t *cdp; 957 switch (mach) { 958 case EM_SPARC: 959 case EM_SPARC32PLUS: 960 case EM_SPARCV9: 961 cdp = cap_desc_sparc; 962 break; 963 case EM_386: 964 case EM_IA_64: 965 case EM_AMD64: 966 cdp = cap_desc_386; 967 break; 968 default: 969 cdp = NULL; 970 break; 971 } 972 if (file_printf(ms, ", uses") == -1) 973 return -1; 974 if (cdp) { 975 while (cdp->cd_name) { 976 if (cap_hw1 & cdp->cd_mask) { 977 if (file_printf(ms, 978 " %s", cdp->cd_name) == -1) 979 return -1; 980 cap_hw1 &= ~cdp->cd_mask; 981 } 982 ++cdp; 983 } 984 if (cap_hw1) 985 if (file_printf(ms, 986 " unknown hardware capability 0x%llx", 987 (unsigned long long)cap_hw1) == -1) 988 return -1; 989 } else { 990 if (file_printf(ms, 991 " hardware capability 0x%llx", 992 (unsigned long long)cap_hw1) == -1) 993 return -1; 994 } 995 } 996 if (cap_sf1) { 997 if (cap_sf1 & SF1_SUNW_FPUSED) { 998 if (file_printf(ms, 999 (cap_sf1 & SF1_SUNW_FPKNWN) 1000 ? ", uses frame pointer" 1001 : ", not known to use frame pointer") == -1) 1002 return -1; 1003 } 1004 cap_sf1 &= ~SF1_SUNW_MASK; 1005 if (cap_sf1) 1006 if (file_printf(ms, 1007 ", with unknown software capability 0x%llx", 1008 (unsigned long long)cap_sf1) == -1) 1009 return -1; 1010 } 1011 return 0; 1012 } 1013 1014 /* 1015 * Look through the program headers of an executable image, searching 1016 * for a PT_INTERP section; if one is found, it's dynamically linked, 1017 * otherwise it's statically linked. 1018 */ 1019 private int 1020 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1021 int num, size_t size, off_t fsize, int *flags, int sh_num) 1022 { 1023 Elf32_Phdr ph32; 1024 Elf64_Phdr ph64; 1025 const char *linking_style = "statically"; 1026 const char *shared_libraries = ""; 1027 unsigned char nbuf[BUFSIZ]; 1028 ssize_t bufsize; 1029 size_t offset, align; 1030 off_t savedoffset = (off_t)-1; 1031 struct stat st; 1032 1033 if (fstat(fd, &st) < 0) { 1034 file_badread(ms); 1035 return -1; 1036 } 1037 1038 if (size != xph_sizeof) { 1039 if (file_printf(ms, ", corrupted program header size") == -1) 1040 return -1; 1041 return 0; 1042 } 1043 1044 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 1045 file_badseek(ms); 1046 return -1; 1047 } 1048 1049 for ( ; num; num--) { 1050 if (read(fd, xph_addr, xph_sizeof) == -1) { 1051 file_badread(ms); 1052 return -1; 1053 } 1054 if (xph_offset > st.st_size && savedoffset != (off_t)-1) { 1055 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1056 file_badseek(ms); 1057 return -1; 1058 } 1059 continue; 1060 } 1061 1062 if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) { 1063 file_badseek(ms); 1064 return -1; 1065 } 1066 1067 if (xph_offset > fsize) { 1068 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1069 file_badseek(ms); 1070 return -1; 1071 } 1072 continue; 1073 } 1074 1075 switch (xph_type) { 1076 case PT_DYNAMIC: 1077 linking_style = "dynamically"; 1078 break; 1079 case PT_INTERP: 1080 shared_libraries = " (uses shared libs)"; 1081 break; 1082 case PT_NOTE: 1083 if ((align = xph_align) & 0x80000000UL) { 1084 if (file_printf(ms, 1085 ", invalid note alignment 0x%lx", 1086 (unsigned long)align) == -1) 1087 return -1; 1088 align = 4; 1089 } 1090 if (sh_num) 1091 break; 1092 /* 1093 * This is a PT_NOTE section; loop through all the notes 1094 * in the section. 1095 */ 1096 if (lseek(fd, xph_offset, SEEK_SET) 1097 == (off_t)-1) { 1098 file_badseek(ms); 1099 return -1; 1100 } 1101 bufsize = read(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ? 1102 xph_filesz : sizeof(nbuf))); 1103 if (bufsize == -1) { 1104 file_badread(ms); 1105 return -1; 1106 } 1107 offset = 0; 1108 for (;;) { 1109 if (offset >= (size_t)bufsize) 1110 break; 1111 offset = donote(ms, nbuf, offset, 1112 (size_t)bufsize, clazz, swap, align, 1113 flags); 1114 if (offset == 0) 1115 break; 1116 } 1117 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1118 file_badseek(ms); 1119 return -1; 1120 } 1121 break; 1122 default: 1123 break; 1124 } 1125 } 1126 if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries) 1127 == -1) 1128 return -1; 1129 return 0; 1130 } 1131 1132 1133 protected int 1134 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, 1135 size_t nbytes) 1136 { 1137 union { 1138 int32_t l; 1139 char c[sizeof (int32_t)]; 1140 } u; 1141 int clazz; 1142 int swap; 1143 struct stat st; 1144 off_t fsize; 1145 int flags = 0; 1146 Elf32_Ehdr elf32hdr; 1147 Elf64_Ehdr elf64hdr; 1148 uint16_t type; 1149 1150 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) 1151 return 0; 1152 /* 1153 * ELF executables have multiple section headers in arbitrary 1154 * file locations and thus file(1) cannot determine it from easily. 1155 * Instead we traverse thru all section headers until a symbol table 1156 * one is found or else the binary is stripped. 1157 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1158 */ 1159 if (buf[EI_MAG0] != ELFMAG0 1160 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1161 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1162 return 0; 1163 1164 /* 1165 * If we cannot seek, it must be a pipe, socket or fifo. 1166 */ 1167 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1168 fd = file_pipe2file(ms, fd, buf, nbytes); 1169 1170 if (fstat(fd, &st) == -1) { 1171 file_badread(ms); 1172 return -1; 1173 } 1174 fsize = st.st_size; 1175 1176 clazz = buf[EI_CLASS]; 1177 1178 switch (clazz) { 1179 case ELFCLASS32: 1180 #undef elf_getu 1181 #define elf_getu(a, b) elf_getu32(a, b) 1182 #undef elfhdr 1183 #define elfhdr elf32hdr 1184 #include "elfclass.h" 1185 case ELFCLASS64: 1186 #undef elf_getu 1187 #define elf_getu(a, b) elf_getu64(a, b) 1188 #undef elfhdr 1189 #define elfhdr elf64hdr 1190 #include "elfclass.h" 1191 default: 1192 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1193 return -1; 1194 break; 1195 } 1196 return 0; 1197 } 1198 #endif 1199