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 1.86 2010/07/21 16:47:18 christos Exp $") 31 #endif 32 33 #ifdef BUILTIN_ELF 34 #include <string.h> 35 #include <ctype.h> 36 #include <stdlib.h> 37 #ifdef HAVE_UNISTD_H 38 #include <unistd.h> 39 #endif 40 41 #include "readelf.h" 42 #include "magic.h" 43 44 #ifdef ELFCORE 45 private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t, 46 off_t, int *); 47 #endif 48 private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t, 49 off_t, int *, int); 50 private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, int *, 51 int); 52 private size_t donote(struct magic_set *, void *, size_t, size_t, int, 53 int, size_t, int *); 54 55 #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) 56 57 #define isquote(c) (strchr("'\"`", (c)) != NULL) 58 59 private uint16_t getu16(int, uint16_t); 60 private uint32_t getu32(int, uint32_t); 61 private uint64_t getu64(int, uint64_t); 62 63 private uint16_t 64 getu16(int swap, uint16_t value) 65 { 66 union { 67 uint16_t ui; 68 char c[2]; 69 } retval, tmpval; 70 71 if (swap) { 72 tmpval.ui = value; 73 74 retval.c[0] = tmpval.c[1]; 75 retval.c[1] = tmpval.c[0]; 76 77 return retval.ui; 78 } else 79 return value; 80 } 81 82 private uint32_t 83 getu32(int swap, uint32_t value) 84 { 85 union { 86 uint32_t ui; 87 char c[4]; 88 } retval, tmpval; 89 90 if (swap) { 91 tmpval.ui = value; 92 93 retval.c[0] = tmpval.c[3]; 94 retval.c[1] = tmpval.c[2]; 95 retval.c[2] = tmpval.c[1]; 96 retval.c[3] = tmpval.c[0]; 97 98 return retval.ui; 99 } else 100 return value; 101 } 102 103 private uint64_t 104 getu64(int swap, uint64_t value) 105 { 106 union { 107 uint64_t ui; 108 char c[8]; 109 } retval, tmpval; 110 111 if (swap) { 112 tmpval.ui = value; 113 114 retval.c[0] = tmpval.c[7]; 115 retval.c[1] = tmpval.c[6]; 116 retval.c[2] = tmpval.c[5]; 117 retval.c[3] = tmpval.c[4]; 118 retval.c[4] = tmpval.c[3]; 119 retval.c[5] = tmpval.c[2]; 120 retval.c[6] = tmpval.c[1]; 121 retval.c[7] = tmpval.c[0]; 122 123 return retval.ui; 124 } else 125 return value; 126 } 127 128 #define elf_getu16(swap, value) getu16(swap, value) 129 #define elf_getu32(swap, value) getu32(swap, value) 130 #ifdef USE_ARRAY_FOR_64BIT_TYPES 131 # define elf_getu64(swap, array) \ 132 ((swap ? ((uint64_t)elf_getu32(swap, array[0])) << 32 : elf_getu32(swap, array[0])) + \ 133 (swap ? elf_getu32(swap, array[1]) : ((uint64_t)elf_getu32(swap, array[1]) << 32))) 134 #else 135 # define elf_getu64(swap, value) getu64(swap, value) 136 #endif 137 138 #define xsh_addr (clazz == ELFCLASS32 \ 139 ? (void *) &sh32 \ 140 : (void *) &sh64) 141 #define xsh_sizeof (clazz == ELFCLASS32 \ 142 ? sizeof sh32 \ 143 : sizeof sh64) 144 #define xsh_size (clazz == ELFCLASS32 \ 145 ? elf_getu32(swap, sh32.sh_size) \ 146 : elf_getu64(swap, sh64.sh_size)) 147 #define xsh_offset (clazz == ELFCLASS32 \ 148 ? elf_getu32(swap, sh32.sh_offset) \ 149 : elf_getu64(swap, sh64.sh_offset)) 150 #define xsh_type (clazz == ELFCLASS32 \ 151 ? elf_getu32(swap, sh32.sh_type) \ 152 : elf_getu32(swap, sh64.sh_type)) 153 #define xph_addr (clazz == ELFCLASS32 \ 154 ? (void *) &ph32 \ 155 : (void *) &ph64) 156 #define xph_sizeof (clazz == ELFCLASS32 \ 157 ? sizeof ph32 \ 158 : sizeof ph64) 159 #define xph_type (clazz == ELFCLASS32 \ 160 ? elf_getu32(swap, ph32.p_type) \ 161 : elf_getu32(swap, ph64.p_type)) 162 #define xph_offset (off_t)(clazz == ELFCLASS32 \ 163 ? elf_getu32(swap, ph32.p_offset) \ 164 : elf_getu64(swap, ph64.p_offset)) 165 #define xph_align (size_t)((clazz == ELFCLASS32 \ 166 ? (off_t) (ph32.p_align ? \ 167 elf_getu32(swap, ph32.p_align) : 4) \ 168 : (off_t) (ph64.p_align ? \ 169 elf_getu64(swap, ph64.p_align) : 4))) 170 #define xph_filesz (size_t)((clazz == ELFCLASS32 \ 171 ? elf_getu32(swap, ph32.p_filesz) \ 172 : elf_getu64(swap, ph64.p_filesz))) 173 #define xnh_addr (clazz == ELFCLASS32 \ 174 ? (void *) &nh32 \ 175 : (void *) &nh64) 176 #define xph_memsz (size_t)((clazz == ELFCLASS32 \ 177 ? elf_getu32(swap, ph32.p_memsz) \ 178 : elf_getu64(swap, ph64.p_memsz))) 179 #define xnh_sizeof (clazz == ELFCLASS32 \ 180 ? sizeof nh32 \ 181 : sizeof nh64) 182 #define xnh_type (clazz == ELFCLASS32 \ 183 ? elf_getu32(swap, nh32.n_type) \ 184 : elf_getu32(swap, nh64.n_type)) 185 #define xnh_namesz (clazz == ELFCLASS32 \ 186 ? elf_getu32(swap, nh32.n_namesz) \ 187 : elf_getu32(swap, nh64.n_namesz)) 188 #define xnh_descsz (clazz == ELFCLASS32 \ 189 ? elf_getu32(swap, nh32.n_descsz) \ 190 : elf_getu32(swap, nh64.n_descsz)) 191 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 192 ? prpsoffsets32[i] \ 193 : prpsoffsets64[i]) 194 #define xcap_addr (clazz == ELFCLASS32 \ 195 ? (void *) &cap32 \ 196 : (void *) &cap64) 197 #define xcap_sizeof (clazz == ELFCLASS32 \ 198 ? sizeof cap32 \ 199 : sizeof cap64) 200 #define xcap_tag (clazz == ELFCLASS32 \ 201 ? elf_getu32(swap, cap32.c_tag) \ 202 : elf_getu64(swap, cap64.c_tag)) 203 #define xcap_val (clazz == ELFCLASS32 \ 204 ? elf_getu32(swap, cap32.c_un.c_val) \ 205 : elf_getu64(swap, cap64.c_un.c_val)) 206 207 #ifdef ELFCORE 208 /* 209 * Try larger offsets first to avoid false matches 210 * from earlier data that happen to look like strings. 211 */ 212 static const size_t prpsoffsets32[] = { 213 #ifdef USE_NT_PSINFO 214 104, /* SunOS 5.x (command line) */ 215 88, /* SunOS 5.x (short name) */ 216 #endif /* USE_NT_PSINFO */ 217 218 100, /* SunOS 5.x (command line) */ 219 84, /* SunOS 5.x (short name) */ 220 221 44, /* Linux (command line) */ 222 28, /* Linux 2.0.36 (short name) */ 223 224 8, /* FreeBSD */ 225 }; 226 227 static const size_t prpsoffsets64[] = { 228 #ifdef USE_NT_PSINFO 229 152, /* SunOS 5.x (command line) */ 230 136, /* SunOS 5.x (short name) */ 231 #endif /* USE_NT_PSINFO */ 232 233 136, /* SunOS 5.x, 64-bit (command line) */ 234 120, /* SunOS 5.x, 64-bit (short name) */ 235 236 56, /* Linux (command line) */ 237 40, /* Linux (tested on core from 2.4.x, short name) */ 238 239 16, /* FreeBSD, 64-bit */ 240 }; 241 242 #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0]) 243 #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0]) 244 245 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 246 247 /* 248 * Look through the program headers of an executable image, searching 249 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 250 * "FreeBSD"; if one is found, try looking in various places in its 251 * contents for a 16-character string containing only printable 252 * characters - if found, that string should be the name of the program 253 * that dropped core. Note: right after that 16-character string is, 254 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 255 * Linux, a longer string (80 characters, in 5.x, probably other 256 * SVR4-flavored systems, and Linux) containing the start of the 257 * command line for that program. 258 * 259 * SunOS 5.x core files contain two PT_NOTE sections, with the types 260 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 261 * same info about the command name and command line, so it probably 262 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 263 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 264 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 265 * the SunOS 5.x file command relies on this (and prefers the latter). 266 * 267 * The signal number probably appears in a section of type NT_PRSTATUS, 268 * but that's also rather OS-dependent, in ways that are harder to 269 * dissect with heuristics, so I'm not bothering with the signal number. 270 * (I suppose the signal number could be of interest in situations where 271 * you don't have the binary of the program that dropped core; if you 272 * *do* have that binary, the debugger will probably tell you what 273 * signal it was.) 274 */ 275 276 #define OS_STYLE_SVR4 0 277 #define OS_STYLE_FREEBSD 1 278 #define OS_STYLE_NETBSD 2 279 280 private const char os_style_names[][8] = { 281 "SVR4", 282 "FreeBSD", 283 "NetBSD", 284 }; 285 286 #define FLAGS_DID_CORE 1 287 #define FLAGS_DID_NOTE 2 288 #define FLAGS_DID_CORE_STYLE 4 289 #define FLAGS_IS_CORE 8 290 291 private int 292 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 293 int num, size_t size, off_t fsize, int *flags) 294 { 295 Elf32_Phdr ph32; 296 Elf64_Phdr ph64; 297 size_t offset; 298 unsigned char nbuf[BUFSIZ]; 299 ssize_t bufsize; 300 off_t savedoffset; 301 struct stat st; 302 303 if (fstat(fd, &st) < 0) { 304 file_badread(ms); 305 return -1; 306 } 307 308 if (size != xph_sizeof) { 309 if (file_printf(ms, ", corrupted program header size") == -1) 310 return -1; 311 return 0; 312 } 313 314 /* 315 * Loop through all the program headers. 316 */ 317 for ( ; num; num--) { 318 if ((savedoffset = lseek(fd, off, SEEK_SET)) == (off_t)-1) { 319 file_badseek(ms); 320 return -1; 321 } 322 if (read(fd, xph_addr, xph_sizeof) == -1) { 323 file_badread(ms); 324 return -1; 325 } 326 if (xph_offset > fsize) { 327 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 328 file_badseek(ms); 329 return -1; 330 } 331 continue; 332 } 333 334 off += size; 335 if (xph_type != PT_NOTE) 336 continue; 337 338 /* 339 * This is a PT_NOTE section; loop through all the notes 340 * in the section. 341 */ 342 if (lseek(fd, xph_offset, SEEK_SET) == (off_t)-1) { 343 file_badseek(ms); 344 return -1; 345 } 346 bufsize = read(fd, nbuf, 347 ((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf))); 348 if (bufsize == -1) { 349 file_badread(ms); 350 return -1; 351 } 352 offset = 0; 353 for (;;) { 354 if (offset >= (size_t)bufsize) 355 break; 356 offset = donote(ms, nbuf, offset, (size_t)bufsize, 357 clazz, swap, 4, flags); 358 if (offset == 0) 359 break; 360 361 } 362 } 363 return 0; 364 } 365 #endif 366 367 private size_t 368 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 369 int clazz, int swap, size_t align, int *flags) 370 { 371 Elf32_Nhdr nh32; 372 Elf64_Nhdr nh64; 373 size_t noff, doff; 374 #ifdef ELFCORE 375 int os_style = -1; 376 #endif 377 uint32_t namesz, descsz; 378 unsigned char *nbuf = CAST(unsigned char *, vbuf); 379 380 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 381 offset += xnh_sizeof; 382 383 namesz = xnh_namesz; 384 descsz = xnh_descsz; 385 if ((namesz == 0) && (descsz == 0)) { 386 /* 387 * We're out of note headers. 388 */ 389 return (offset >= size) ? offset : size; 390 } 391 392 if (namesz & 0x80000000) { 393 (void)file_printf(ms, ", bad note name size 0x%lx", 394 (unsigned long)namesz); 395 return offset; 396 } 397 398 if (descsz & 0x80000000) { 399 (void)file_printf(ms, ", bad note description size 0x%lx", 400 (unsigned long)descsz); 401 return offset; 402 } 403 404 405 noff = offset; 406 doff = ELF_ALIGN(offset + namesz); 407 408 if (offset + namesz > size) { 409 /* 410 * We're past the end of the buffer. 411 */ 412 return doff; 413 } 414 415 offset = ELF_ALIGN(doff + descsz); 416 if (doff + descsz > size) { 417 /* 418 * We're past the end of the buffer. 419 */ 420 return (offset >= size) ? offset : size; 421 } 422 423 if (*flags & FLAGS_DID_NOTE) 424 goto core; 425 426 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 427 xnh_type == NT_GNU_VERSION && descsz == 16) { 428 uint32_t desc[4]; 429 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 430 431 if (file_printf(ms, ", for GNU/") == -1) 432 return size; 433 switch (elf_getu32(swap, desc[0])) { 434 case GNU_OS_LINUX: 435 if (file_printf(ms, "Linux") == -1) 436 return size; 437 break; 438 case GNU_OS_HURD: 439 if (file_printf(ms, "Hurd") == -1) 440 return size; 441 break; 442 case GNU_OS_SOLARIS: 443 if (file_printf(ms, "Solaris") == -1) 444 return size; 445 break; 446 case GNU_OS_KFREEBSD: 447 if (file_printf(ms, "kFreeBSD") == -1) 448 return size; 449 break; 450 case GNU_OS_KNETBSD: 451 if (file_printf(ms, "kNetBSD") == -1) 452 return size; 453 break; 454 default: 455 if (file_printf(ms, "<unknown>") == -1) 456 return size; 457 } 458 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 459 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 460 return size; 461 *flags |= FLAGS_DID_NOTE; 462 return size; 463 } 464 465 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 && 466 xnh_type == NT_NETBSD_VERSION && descsz == 4) { 467 uint32_t desc; 468 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 469 desc = elf_getu32(swap, desc); 470 471 if (file_printf(ms, ", for NetBSD") == -1) 472 return size; 473 /* 474 * The version number used to be stuck as 199905, and was thus 475 * basically content-free. Newer versions of NetBSD have fixed 476 * this and now use the encoding of __NetBSD_Version__: 477 * 478 * MMmmrrpp00 479 * 480 * M = major version 481 * m = minor version 482 * r = release ["",A-Z,Z[A-Z] but numeric] 483 * p = patchlevel 484 */ 485 if (desc > 100000000U) { 486 uint32_t ver_patch = (desc / 100) % 100; 487 uint32_t ver_rel = (desc / 10000) % 100; 488 uint32_t ver_min = (desc / 1000000) % 100; 489 uint32_t ver_maj = desc / 100000000; 490 491 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 492 return size; 493 if (ver_rel == 0 && ver_patch != 0) { 494 if (file_printf(ms, ".%u", ver_patch) == -1) 495 return size; 496 } else if (ver_rel != 0) { 497 while (ver_rel > 26) { 498 if (file_printf(ms, "Z") == -1) 499 return size; 500 ver_rel -= 26; 501 } 502 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 503 == -1) 504 return size; 505 } 506 } 507 *flags |= FLAGS_DID_NOTE; 508 return size; 509 } 510 511 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 && 512 xnh_type == NT_FREEBSD_VERSION && descsz == 4) { 513 uint32_t desc; 514 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 515 desc = elf_getu32(swap, desc); 516 if (file_printf(ms, ", for FreeBSD") == -1) 517 return size; 518 519 /* 520 * Contents is __FreeBSD_version, whose relation to OS 521 * versions is defined by a huge table in the Porter's 522 * Handbook. This is the general scheme: 523 * 524 * Releases: 525 * Mmp000 (before 4.10) 526 * Mmi0p0 (before 5.0) 527 * Mmm0p0 528 * 529 * Development branches: 530 * Mmpxxx (before 4.6) 531 * Mmp1xx (before 4.10) 532 * Mmi1xx (before 5.0) 533 * M000xx (pre-M.0) 534 * Mmm1xx 535 * 536 * M = major version 537 * m = minor version 538 * i = minor version increment (491000 -> 4.10) 539 * p = patchlevel 540 * x = revision 541 * 542 * The first release of FreeBSD to use ELF by default 543 * was version 3.0. 544 */ 545 if (desc == 460002) { 546 if (file_printf(ms, " 4.6.2") == -1) 547 return size; 548 } else if (desc < 460100) { 549 if (file_printf(ms, " %d.%d", desc / 100000, 550 desc / 10000 % 10) == -1) 551 return size; 552 if (desc / 1000 % 10 > 0) 553 if (file_printf(ms, ".%d", desc / 1000 % 10) 554 == -1) 555 return size; 556 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 557 if (file_printf(ms, " (%d)", desc) == -1) 558 return size; 559 } else if (desc < 500000) { 560 if (file_printf(ms, " %d.%d", desc / 100000, 561 desc / 10000 % 10 + desc / 1000 % 10) == -1) 562 return size; 563 if (desc / 100 % 10 > 0) { 564 if (file_printf(ms, " (%d)", desc) == -1) 565 return size; 566 } else if (desc / 10 % 10 > 0) { 567 if (file_printf(ms, ".%d", desc / 10 % 10) 568 == -1) 569 return size; 570 } 571 } else { 572 if (file_printf(ms, " %d.%d", desc / 100000, 573 desc / 1000 % 100) == -1) 574 return size; 575 if ((desc / 100 % 10 > 0) || 576 (desc % 100000 / 100 == 0)) { 577 if (file_printf(ms, " (%d)", desc) == -1) 578 return size; 579 } else if (desc / 10 % 10 > 0) { 580 if (file_printf(ms, ".%d", desc / 10 % 10) 581 == -1) 582 return size; 583 } 584 } 585 *flags |= FLAGS_DID_NOTE; 586 return size; 587 } 588 589 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && 590 xnh_type == NT_OPENBSD_VERSION && descsz == 4) { 591 if (file_printf(ms, ", for OpenBSD") == -1) 592 return size; 593 /* Content of note is always 0 */ 594 *flags |= FLAGS_DID_NOTE; 595 return size; 596 } 597 598 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && 599 xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) { 600 uint32_t desc; 601 if (file_printf(ms, ", for DragonFly") == -1) 602 return size; 603 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 604 desc = elf_getu32(swap, desc); 605 if (file_printf(ms, " %d.%d.%d", desc / 100000, 606 desc / 10000 % 10, desc % 10000) == -1) 607 return size; 608 *flags |= FLAGS_DID_NOTE; 609 return size; 610 } 611 612 core: 613 /* 614 * Sigh. The 2.0.36 kernel in Debian 2.1, at 615 * least, doesn't correctly implement name 616 * sections, in core dumps, as specified by 617 * the "Program Linking" section of "UNIX(R) System 618 * V Release 4 Programmer's Guide: ANSI C and 619 * Programming Support Tools", because my copy 620 * clearly says "The first 'namesz' bytes in 'name' 621 * contain a *null-terminated* [emphasis mine] 622 * character representation of the entry's owner 623 * or originator", but the 2.0.36 kernel code 624 * doesn't include the terminating null in the 625 * name.... 626 */ 627 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || 628 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { 629 os_style = OS_STYLE_SVR4; 630 } 631 632 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { 633 os_style = OS_STYLE_FREEBSD; 634 } 635 636 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) 637 == 0)) { 638 os_style = OS_STYLE_NETBSD; 639 } 640 641 #ifdef ELFCORE 642 if ((*flags & FLAGS_DID_CORE) != 0) 643 return size; 644 645 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 646 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 647 == -1) 648 return size; 649 *flags |= FLAGS_DID_CORE_STYLE; 650 } 651 652 switch (os_style) { 653 case OS_STYLE_NETBSD: 654 if (xnh_type == NT_NETBSD_CORE_PROCINFO) { 655 uint32_t signo; 656 /* 657 * Extract the program name. It is at 658 * offset 0x7c, and is up to 32-bytes, 659 * including the terminating NUL. 660 */ 661 if (file_printf(ms, ", from '%.31s'", 662 &nbuf[doff + 0x7c]) == -1) 663 return size; 664 665 /* 666 * Extract the signal number. It is at 667 * offset 0x08. 668 */ 669 (void)memcpy(&signo, &nbuf[doff + 0x08], 670 sizeof(signo)); 671 if (file_printf(ms, " (signal %u)", 672 elf_getu32(swap, signo)) == -1) 673 return size; 674 *flags |= FLAGS_DID_CORE; 675 return size; 676 } 677 break; 678 679 default: 680 if (xnh_type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 681 size_t i, j; 682 unsigned char c; 683 /* 684 * Extract the program name. We assume 685 * it to be 16 characters (that's what it 686 * is in SunOS 5.x and Linux). 687 * 688 * Unfortunately, it's at a different offset 689 * in various OSes, so try multiple offsets. 690 * If the characters aren't all printable, 691 * reject it. 692 */ 693 for (i = 0; i < NOFFSETS; i++) { 694 unsigned char *cname, *cp; 695 size_t reloffset = prpsoffsets(i); 696 size_t noffset = doff + reloffset; 697 for (j = 0; j < 16; j++, noffset++, 698 reloffset++) { 699 /* 700 * Make sure we're not past 701 * the end of the buffer; if 702 * we are, just give up. 703 */ 704 if (noffset >= size) 705 goto tryanother; 706 707 /* 708 * Make sure we're not past 709 * the end of the contents; 710 * if we are, this obviously 711 * isn't the right offset. 712 */ 713 if (reloffset >= descsz) 714 goto tryanother; 715 716 c = nbuf[noffset]; 717 if (c == '\0') { 718 /* 719 * A '\0' at the 720 * beginning is 721 * obviously wrong. 722 * Any other '\0' 723 * means we're done. 724 */ 725 if (j == 0) 726 goto tryanother; 727 else 728 break; 729 } else { 730 /* 731 * A nonprintable 732 * character is also 733 * wrong. 734 */ 735 if (!isprint(c) || isquote(c)) 736 goto tryanother; 737 } 738 } 739 /* 740 * Well, that worked. 741 */ 742 743 /* 744 * Try next offsets, in case this match is 745 * in the middle of a string. 746 */ 747 size_t k; 748 for (k = i + 1 ; k < NOFFSETS ; k++) { 749 if (prpsoffsets(k) >= prpsoffsets(i)) 750 continue; 751 size_t no; 752 int adjust = 1; 753 for (no = doff + prpsoffsets(k); 754 no < doff + prpsoffsets(i); no++) 755 adjust = adjust 756 && isprint(nbuf[no]); 757 if (adjust) 758 i = k; 759 } 760 761 cname = (unsigned char *) 762 &nbuf[doff + prpsoffsets(i)]; 763 for (cp = cname; *cp && isprint(*cp); cp++) 764 continue; 765 /* 766 * Linux apparently appends a space at the end 767 * of the command line: remove it. 768 */ 769 while (cp > cname && isspace(cp[-1])) 770 cp--; 771 if (file_printf(ms, ", from '%.*s'", 772 (int)(cp - cname), cname) == -1) 773 return size; 774 *flags |= FLAGS_DID_CORE; 775 return size; 776 777 tryanother: 778 ; 779 } 780 } 781 break; 782 } 783 #endif 784 return offset; 785 } 786 787 /* SunOS 5.x hardware capability descriptions */ 788 typedef struct cap_desc { 789 uint64_t cd_mask; 790 const char *cd_name; 791 } cap_desc_t; 792 793 static const cap_desc_t cap_desc_sparc[] = { 794 { AV_SPARC_MUL32, "MUL32" }, 795 { AV_SPARC_DIV32, "DIV32" }, 796 { AV_SPARC_FSMULD, "FSMULD" }, 797 { AV_SPARC_V8PLUS, "V8PLUS" }, 798 { AV_SPARC_POPC, "POPC" }, 799 { AV_SPARC_VIS, "VIS" }, 800 { AV_SPARC_VIS2, "VIS2" }, 801 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 802 { AV_SPARC_FMAF, "FMAF" }, 803 { AV_SPARC_FJFMAU, "FJFMAU" }, 804 { AV_SPARC_IMA, "IMA" }, 805 { 0, NULL } 806 }; 807 808 static const cap_desc_t cap_desc_386[] = { 809 { AV_386_FPU, "FPU" }, 810 { AV_386_TSC, "TSC" }, 811 { AV_386_CX8, "CX8" }, 812 { AV_386_SEP, "SEP" }, 813 { AV_386_AMD_SYSC, "AMD_SYSC" }, 814 { AV_386_CMOV, "CMOV" }, 815 { AV_386_MMX, "MMX" }, 816 { AV_386_AMD_MMX, "AMD_MMX" }, 817 { AV_386_AMD_3DNow, "AMD_3DNow" }, 818 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 819 { AV_386_FXSR, "FXSR" }, 820 { AV_386_SSE, "SSE" }, 821 { AV_386_SSE2, "SSE2" }, 822 { AV_386_PAUSE, "PAUSE" }, 823 { AV_386_SSE3, "SSE3" }, 824 { AV_386_MON, "MON" }, 825 { AV_386_CX16, "CX16" }, 826 { AV_386_AHF, "AHF" }, 827 { AV_386_TSCP, "TSCP" }, 828 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 829 { AV_386_POPCNT, "POPCNT" }, 830 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 831 { AV_386_SSSE3, "SSSE3" }, 832 { AV_386_SSE4_1, "SSE4.1" }, 833 { AV_386_SSE4_2, "SSE4.2" }, 834 { 0, NULL } 835 }; 836 837 private int 838 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 839 size_t size, int *flags, int mach) 840 { 841 Elf32_Shdr sh32; 842 Elf64_Shdr sh64; 843 int stripped = 1; 844 void *nbuf; 845 off_t noff; 846 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */ 847 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */ 848 849 if (size != xsh_sizeof) { 850 if (file_printf(ms, ", corrupted section header size") == -1) 851 return -1; 852 return 0; 853 } 854 855 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 856 file_badseek(ms); 857 return -1; 858 } 859 860 for ( ; num; num--) { 861 if (read(fd, xsh_addr, xsh_sizeof) == -1) { 862 file_badread(ms); 863 return -1; 864 } 865 switch (xsh_type) { 866 case SHT_SYMTAB: 867 #if 0 868 case SHT_DYNSYM: 869 #endif 870 stripped = 0; 871 break; 872 case SHT_NOTE: 873 if ((off = lseek(fd, (off_t)0, SEEK_CUR)) == 874 (off_t)-1) { 875 file_badread(ms); 876 return -1; 877 } 878 if ((nbuf = malloc((size_t)xsh_size)) == NULL) { 879 file_error(ms, errno, "Cannot allocate memory" 880 " for note"); 881 return -1; 882 } 883 if ((noff = lseek(fd, (off_t)xsh_offset, SEEK_SET)) == 884 (off_t)-1) { 885 file_badread(ms); 886 free(nbuf); 887 return -1; 888 } 889 if (read(fd, nbuf, (size_t)xsh_size) != 890 (ssize_t)xsh_size) { 891 free(nbuf); 892 file_badread(ms); 893 return -1; 894 } 895 896 noff = 0; 897 for (;;) { 898 if (noff >= (off_t)xsh_size) 899 break; 900 noff = donote(ms, nbuf, (size_t)noff, 901 (size_t)xsh_size, clazz, swap, 4, 902 flags); 903 if (noff == 0) 904 break; 905 } 906 if ((lseek(fd, off, SEEK_SET)) == (off_t)-1) { 907 free(nbuf); 908 file_badread(ms); 909 return -1; 910 } 911 free(nbuf); 912 break; 913 case SHT_SUNW_cap: 914 { 915 off_t coff; 916 if ((off = lseek(fd, (off_t)0, SEEK_CUR)) == 917 (off_t)-1) { 918 file_badread(ms); 919 return -1; 920 } 921 if (lseek(fd, (off_t)xsh_offset, SEEK_SET) == 922 (off_t)-1) { 923 file_badread(ms); 924 return -1; 925 } 926 coff = 0; 927 for (;;) { 928 Elf32_Cap cap32; 929 Elf64_Cap cap64; 930 char cbuf[/*CONSTCOND*/ 931 MAX(sizeof cap32, sizeof cap64)]; 932 if ((coff += xcap_sizeof) > (off_t)xsh_size) 933 break; 934 if (read(fd, cbuf, (size_t)xcap_sizeof) != 935 (ssize_t)xcap_sizeof) { 936 file_badread(ms); 937 return -1; 938 } 939 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 940 switch (xcap_tag) { 941 case CA_SUNW_NULL: 942 break; 943 case CA_SUNW_HW_1: 944 cap_hw1 |= xcap_val; 945 break; 946 case CA_SUNW_SF_1: 947 cap_sf1 |= xcap_val; 948 break; 949 default: 950 if (file_printf(ms, 951 ", with unknown capability " 952 "0x%" INT64_T_FORMAT "x = 0x%" 953 INT64_T_FORMAT "x", 954 (unsigned long long)xcap_tag, 955 (unsigned long long)xcap_val) == -1) 956 return -1; 957 break; 958 } 959 } 960 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 961 file_badread(ms); 962 return -1; 963 } 964 break; 965 } 966 } 967 } 968 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 969 return -1; 970 if (cap_hw1) { 971 const cap_desc_t *cdp; 972 switch (mach) { 973 case EM_SPARC: 974 case EM_SPARC32PLUS: 975 case EM_SPARCV9: 976 cdp = cap_desc_sparc; 977 break; 978 case EM_386: 979 case EM_IA_64: 980 case EM_AMD64: 981 cdp = cap_desc_386; 982 break; 983 default: 984 cdp = NULL; 985 break; 986 } 987 if (file_printf(ms, ", uses") == -1) 988 return -1; 989 if (cdp) { 990 while (cdp->cd_name) { 991 if (cap_hw1 & cdp->cd_mask) { 992 if (file_printf(ms, 993 " %s", cdp->cd_name) == -1) 994 return -1; 995 cap_hw1 &= ~cdp->cd_mask; 996 } 997 ++cdp; 998 } 999 if (cap_hw1) 1000 if (file_printf(ms, 1001 " unknown hardware capability 0x%" 1002 INT64_T_FORMAT "x", 1003 (unsigned long long)cap_hw1) == -1) 1004 return -1; 1005 } else { 1006 if (file_printf(ms, 1007 " hardware capability 0x%" INT64_T_FORMAT "x", 1008 (unsigned long long)cap_hw1) == -1) 1009 return -1; 1010 } 1011 } 1012 if (cap_sf1) { 1013 if (cap_sf1 & SF1_SUNW_FPUSED) { 1014 if (file_printf(ms, 1015 (cap_sf1 & SF1_SUNW_FPKNWN) 1016 ? ", uses frame pointer" 1017 : ", not known to use frame pointer") == -1) 1018 return -1; 1019 } 1020 cap_sf1 &= ~SF1_SUNW_MASK; 1021 if (cap_sf1) 1022 if (file_printf(ms, 1023 ", with unknown software capability 0x%" 1024 INT64_T_FORMAT "x", 1025 (unsigned long long)cap_sf1) == -1) 1026 return -1; 1027 } 1028 return 0; 1029 } 1030 1031 /* 1032 * Look through the program headers of an executable image, searching 1033 * for a PT_INTERP section; if one is found, it's dynamically linked, 1034 * otherwise it's statically linked. 1035 */ 1036 private int 1037 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1038 int num, size_t size, off_t fsize, int *flags, int sh_num) 1039 { 1040 Elf32_Phdr ph32; 1041 Elf64_Phdr ph64; 1042 const char *linking_style = "statically"; 1043 const char *shared_libraries = ""; 1044 unsigned char nbuf[BUFSIZ]; 1045 ssize_t bufsize; 1046 size_t offset, align; 1047 off_t savedoffset = (off_t)-1; 1048 struct stat st; 1049 1050 if (fstat(fd, &st) < 0) { 1051 file_badread(ms); 1052 return -1; 1053 } 1054 1055 if (size != xph_sizeof) { 1056 if (file_printf(ms, ", corrupted program header size") == -1) 1057 return -1; 1058 return 0; 1059 } 1060 1061 if (lseek(fd, off, SEEK_SET) == (off_t)-1) { 1062 file_badseek(ms); 1063 return -1; 1064 } 1065 1066 for ( ; num; num--) { 1067 if (read(fd, xph_addr, xph_sizeof) == -1) { 1068 file_badread(ms); 1069 return -1; 1070 } 1071 if (xph_offset > st.st_size && savedoffset != (off_t)-1) { 1072 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1073 file_badseek(ms); 1074 return -1; 1075 } 1076 continue; 1077 } 1078 1079 if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) { 1080 file_badseek(ms); 1081 return -1; 1082 } 1083 1084 if (xph_offset > fsize) { 1085 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1086 file_badseek(ms); 1087 return -1; 1088 } 1089 continue; 1090 } 1091 1092 switch (xph_type) { 1093 case PT_DYNAMIC: 1094 linking_style = "dynamically"; 1095 break; 1096 case PT_INTERP: 1097 shared_libraries = " (uses shared libs)"; 1098 break; 1099 case PT_NOTE: 1100 if ((align = xph_align) & 0x80000000UL) { 1101 if (file_printf(ms, 1102 ", invalid note alignment 0x%lx", 1103 (unsigned long)align) == -1) 1104 return -1; 1105 align = 4; 1106 } 1107 if (sh_num) 1108 break; 1109 /* 1110 * This is a PT_NOTE section; loop through all the notes 1111 * in the section. 1112 */ 1113 if (lseek(fd, xph_offset, SEEK_SET) 1114 == (off_t)-1) { 1115 file_badseek(ms); 1116 return -1; 1117 } 1118 bufsize = read(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ? 1119 xph_filesz : sizeof(nbuf))); 1120 if (bufsize == -1) { 1121 file_badread(ms); 1122 return -1; 1123 } 1124 offset = 0; 1125 for (;;) { 1126 if (offset >= (size_t)bufsize) 1127 break; 1128 offset = donote(ms, nbuf, offset, 1129 (size_t)bufsize, clazz, swap, align, 1130 flags); 1131 if (offset == 0) 1132 break; 1133 } 1134 if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { 1135 file_badseek(ms); 1136 return -1; 1137 } 1138 break; 1139 default: 1140 break; 1141 } 1142 } 1143 if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries) 1144 == -1) 1145 return -1; 1146 return 0; 1147 } 1148 1149 1150 protected int 1151 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, 1152 size_t nbytes) 1153 { 1154 union { 1155 int32_t l; 1156 char c[sizeof (int32_t)]; 1157 } u; 1158 int clazz; 1159 int swap; 1160 struct stat st; 1161 off_t fsize; 1162 int flags = 0; 1163 Elf32_Ehdr elf32hdr; 1164 Elf64_Ehdr elf64hdr; 1165 uint16_t type; 1166 1167 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) 1168 return 0; 1169 /* 1170 * ELF executables have multiple section headers in arbitrary 1171 * file locations and thus file(1) cannot determine it from easily. 1172 * Instead we traverse thru all section headers until a symbol table 1173 * one is found or else the binary is stripped. 1174 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1175 */ 1176 if (buf[EI_MAG0] != ELFMAG0 1177 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1178 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1179 return 0; 1180 1181 /* 1182 * If we cannot seek, it must be a pipe, socket or fifo. 1183 */ 1184 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1185 fd = file_pipe2file(ms, fd, buf, nbytes); 1186 1187 if (fstat(fd, &st) == -1) { 1188 file_badread(ms); 1189 return -1; 1190 } 1191 fsize = st.st_size; 1192 1193 clazz = buf[EI_CLASS]; 1194 1195 switch (clazz) { 1196 case ELFCLASS32: 1197 #undef elf_getu 1198 #define elf_getu(a, b) elf_getu32(a, b) 1199 #undef elfhdr 1200 #define elfhdr elf32hdr 1201 #include "elfclass.h" 1202 case ELFCLASS64: 1203 #undef elf_getu 1204 #define elf_getu(a, b) elf_getu64(a, b) 1205 #undef elfhdr 1206 #define elfhdr elf64hdr 1207 #include "elfclass.h" 1208 default: 1209 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1210 return -1; 1211 break; 1212 } 1213 return 0; 1214 } 1215 #endif 1216