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 1.111 2014/12/09 02:47:45 christos Exp $") 31 #endif 32 33 #ifdef BUILTIN_ELF 34 #include <string.h> 35 #include <ctype.h> 36 #include <stdlib.h> 37 #ifdef HAVE_UNISTD_H 38 #include <unistd.h> 39 #endif 40 41 #include "readelf.h" 42 #include "magic.h" 43 44 #ifdef ELFCORE 45 private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t, 46 off_t, int *); 47 #endif 48 private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t, 49 off_t, int *, int); 50 private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, 51 off_t, int *, int, 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 #define MAX_PHNUM 128 64 #define MAX_SHNUM 32768 65 #define SIZE_UNKNOWN ((off_t)-1) 66 67 private int 68 toomany(struct magic_set *ms, const char *name, uint16_t num) 69 { 70 if (file_printf(ms, ", too many %s header sections (%u)", name, num 71 ) == -1) 72 return -1; 73 return 0; 74 } 75 76 private uint16_t 77 getu16(int swap, uint16_t value) 78 { 79 union { 80 uint16_t ui; 81 char c[2]; 82 } retval, tmpval; 83 84 if (swap) { 85 tmpval.ui = value; 86 87 retval.c[0] = tmpval.c[1]; 88 retval.c[1] = tmpval.c[0]; 89 90 return retval.ui; 91 } else 92 return value; 93 } 94 95 private uint32_t 96 getu32(int swap, uint32_t value) 97 { 98 union { 99 uint32_t ui; 100 char c[4]; 101 } retval, tmpval; 102 103 if (swap) { 104 tmpval.ui = value; 105 106 retval.c[0] = tmpval.c[3]; 107 retval.c[1] = tmpval.c[2]; 108 retval.c[2] = tmpval.c[1]; 109 retval.c[3] = tmpval.c[0]; 110 111 return retval.ui; 112 } else 113 return value; 114 } 115 116 private uint64_t 117 getu64(int swap, uint64_t value) 118 { 119 union { 120 uint64_t ui; 121 char c[8]; 122 } retval, tmpval; 123 124 if (swap) { 125 tmpval.ui = value; 126 127 retval.c[0] = tmpval.c[7]; 128 retval.c[1] = tmpval.c[6]; 129 retval.c[2] = tmpval.c[5]; 130 retval.c[3] = tmpval.c[4]; 131 retval.c[4] = tmpval.c[3]; 132 retval.c[5] = tmpval.c[2]; 133 retval.c[6] = tmpval.c[1]; 134 retval.c[7] = tmpval.c[0]; 135 136 return retval.ui; 137 } else 138 return value; 139 } 140 141 #define elf_getu16(swap, value) getu16(swap, value) 142 #define elf_getu32(swap, value) getu32(swap, value) 143 #define elf_getu64(swap, value) getu64(swap, value) 144 145 #define xsh_addr (clazz == ELFCLASS32 \ 146 ? (void *)&sh32 \ 147 : (void *)&sh64) 148 #define xsh_sizeof (clazz == ELFCLASS32 \ 149 ? sizeof(sh32) \ 150 : sizeof(sh64)) 151 #define xsh_size (size_t)(clazz == ELFCLASS32 \ 152 ? elf_getu32(swap, sh32.sh_size) \ 153 : elf_getu64(swap, sh64.sh_size)) 154 #define xsh_offset (off_t)(clazz == ELFCLASS32 \ 155 ? elf_getu32(swap, sh32.sh_offset) \ 156 : elf_getu64(swap, sh64.sh_offset)) 157 #define xsh_type (clazz == ELFCLASS32 \ 158 ? elf_getu32(swap, sh32.sh_type) \ 159 : elf_getu32(swap, sh64.sh_type)) 160 #define xsh_name (clazz == ELFCLASS32 \ 161 ? elf_getu32(swap, sh32.sh_name) \ 162 : elf_getu32(swap, sh64.sh_name)) 163 #define xph_addr (clazz == ELFCLASS32 \ 164 ? (void *) &ph32 \ 165 : (void *) &ph64) 166 #define xph_sizeof (clazz == ELFCLASS32 \ 167 ? sizeof(ph32) \ 168 : sizeof(ph64)) 169 #define xph_type (clazz == ELFCLASS32 \ 170 ? elf_getu32(swap, ph32.p_type) \ 171 : elf_getu32(swap, ph64.p_type)) 172 #define xph_offset (off_t)(clazz == ELFCLASS32 \ 173 ? elf_getu32(swap, ph32.p_offset) \ 174 : elf_getu64(swap, ph64.p_offset)) 175 #define xph_align (size_t)((clazz == ELFCLASS32 \ 176 ? (off_t) (ph32.p_align ? \ 177 elf_getu32(swap, ph32.p_align) : 4) \ 178 : (off_t) (ph64.p_align ? \ 179 elf_getu64(swap, ph64.p_align) : 4))) 180 #define xph_filesz (size_t)((clazz == ELFCLASS32 \ 181 ? elf_getu32(swap, ph32.p_filesz) \ 182 : elf_getu64(swap, ph64.p_filesz))) 183 #define xnh_addr (clazz == ELFCLASS32 \ 184 ? (void *)&nh32 \ 185 : (void *)&nh64) 186 #define xph_memsz (size_t)((clazz == ELFCLASS32 \ 187 ? elf_getu32(swap, ph32.p_memsz) \ 188 : elf_getu64(swap, ph64.p_memsz))) 189 #define xnh_sizeof (clazz == ELFCLASS32 \ 190 ? sizeof nh32 \ 191 : sizeof nh64) 192 #define xnh_type (clazz == ELFCLASS32 \ 193 ? elf_getu32(swap, nh32.n_type) \ 194 : elf_getu32(swap, nh64.n_type)) 195 #define xnh_namesz (clazz == ELFCLASS32 \ 196 ? elf_getu32(swap, nh32.n_namesz) \ 197 : elf_getu32(swap, nh64.n_namesz)) 198 #define xnh_descsz (clazz == ELFCLASS32 \ 199 ? elf_getu32(swap, nh32.n_descsz) \ 200 : elf_getu32(swap, nh64.n_descsz)) 201 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 202 ? prpsoffsets32[i] \ 203 : prpsoffsets64[i]) 204 #define xcap_addr (clazz == ELFCLASS32 \ 205 ? (void *)&cap32 \ 206 : (void *)&cap64) 207 #define xcap_sizeof (clazz == ELFCLASS32 \ 208 ? sizeof cap32 \ 209 : sizeof cap64) 210 #define xcap_tag (clazz == ELFCLASS32 \ 211 ? elf_getu32(swap, cap32.c_tag) \ 212 : elf_getu64(swap, cap64.c_tag)) 213 #define xcap_val (clazz == ELFCLASS32 \ 214 ? elf_getu32(swap, cap32.c_un.c_val) \ 215 : elf_getu64(swap, cap64.c_un.c_val)) 216 217 #ifdef ELFCORE 218 /* 219 * Try larger offsets first to avoid false matches 220 * from earlier data that happen to look like strings. 221 */ 222 static const size_t prpsoffsets32[] = { 223 #ifdef USE_NT_PSINFO 224 104, /* SunOS 5.x (command line) */ 225 88, /* SunOS 5.x (short name) */ 226 #endif /* USE_NT_PSINFO */ 227 228 100, /* SunOS 5.x (command line) */ 229 84, /* SunOS 5.x (short name) */ 230 231 44, /* Linux (command line) */ 232 28, /* Linux 2.0.36 (short name) */ 233 234 8, /* FreeBSD */ 235 }; 236 237 static const size_t prpsoffsets64[] = { 238 #ifdef USE_NT_PSINFO 239 152, /* SunOS 5.x (command line) */ 240 136, /* SunOS 5.x (short name) */ 241 #endif /* USE_NT_PSINFO */ 242 243 136, /* SunOS 5.x, 64-bit (command line) */ 244 120, /* SunOS 5.x, 64-bit (short name) */ 245 246 56, /* Linux (command line) */ 247 40, /* Linux (tested on core from 2.4.x, short name) */ 248 249 16, /* FreeBSD, 64-bit */ 250 }; 251 252 #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0]) 253 #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0]) 254 255 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 256 257 /* 258 * Look through the program headers of an executable image, searching 259 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 260 * "FreeBSD"; if one is found, try looking in various places in its 261 * contents for a 16-character string containing only printable 262 * characters - if found, that string should be the name of the program 263 * that dropped core. Note: right after that 16-character string is, 264 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 265 * Linux, a longer string (80 characters, in 5.x, probably other 266 * SVR4-flavored systems, and Linux) containing the start of the 267 * command line for that program. 268 * 269 * SunOS 5.x core files contain two PT_NOTE sections, with the types 270 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 271 * same info about the command name and command line, so it probably 272 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 273 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 274 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 275 * the SunOS 5.x file command relies on this (and prefers the latter). 276 * 277 * The signal number probably appears in a section of type NT_PRSTATUS, 278 * but that's also rather OS-dependent, in ways that are harder to 279 * dissect with heuristics, so I'm not bothering with the signal number. 280 * (I suppose the signal number could be of interest in situations where 281 * you don't have the binary of the program that dropped core; if you 282 * *do* have that binary, the debugger will probably tell you what 283 * signal it was.) 284 */ 285 286 #define OS_STYLE_SVR4 0 287 #define OS_STYLE_FREEBSD 1 288 #define OS_STYLE_NETBSD 2 289 290 private const char os_style_names[][8] = { 291 "SVR4", 292 "FreeBSD", 293 "NetBSD", 294 }; 295 296 #define FLAGS_DID_CORE 0x01 297 #define FLAGS_DID_NOTE 0x02 298 #define FLAGS_DID_BUILD_ID 0x04 299 #define FLAGS_DID_CORE_STYLE 0x08 300 #define FLAGS_IS_CORE 0x10 301 302 private int 303 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 304 int num, size_t size, off_t fsize, int *flags) 305 { 306 Elf32_Phdr ph32; 307 Elf64_Phdr ph64; 308 size_t offset, len; 309 unsigned char nbuf[BUFSIZ]; 310 ssize_t bufsize; 311 312 if (size != xph_sizeof) { 313 if (file_printf(ms, ", corrupted program header size") == -1) 314 return -1; 315 return 0; 316 } 317 318 /* 319 * Loop through all the program headers. 320 */ 321 for ( ; num; num--) { 322 if (pread(fd, xph_addr, xph_sizeof, off) == -1) { 323 file_badread(ms); 324 return -1; 325 } 326 off += size; 327 328 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 329 /* Perhaps warn here */ 330 continue; 331 } 332 333 if (xph_type != PT_NOTE) 334 continue; 335 336 /* 337 * This is a PT_NOTE section; loop through all the notes 338 * in the section. 339 */ 340 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 341 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) { 342 file_badread(ms); 343 return -1; 344 } 345 offset = 0; 346 for (;;) { 347 if (offset >= (size_t)bufsize) 348 break; 349 offset = donote(ms, nbuf, offset, (size_t)bufsize, 350 clazz, swap, 4, flags); 351 if (offset == 0) 352 break; 353 354 } 355 } 356 return 0; 357 } 358 #endif 359 360 static void 361 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 362 { 363 uint32_t desc; 364 (void)memcpy(&desc, v, sizeof(desc)); 365 desc = elf_getu32(swap, desc); 366 367 if (file_printf(ms, ", for NetBSD") == -1) 368 return; 369 /* 370 * The version number used to be stuck as 199905, and was thus 371 * basically content-free. Newer versions of NetBSD have fixed 372 * this and now use the encoding of __NetBSD_Version__: 373 * 374 * MMmmrrpp00 375 * 376 * M = major version 377 * m = minor version 378 * r = release ["",A-Z,Z[A-Z] but numeric] 379 * p = patchlevel 380 */ 381 if (desc > 100000000U) { 382 uint32_t ver_patch = (desc / 100) % 100; 383 uint32_t ver_rel = (desc / 10000) % 100; 384 uint32_t ver_min = (desc / 1000000) % 100; 385 uint32_t ver_maj = desc / 100000000; 386 387 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 388 return; 389 if (ver_rel == 0 && ver_patch != 0) { 390 if (file_printf(ms, ".%u", ver_patch) == -1) 391 return; 392 } else if (ver_rel != 0) { 393 while (ver_rel > 26) { 394 if (file_printf(ms, "Z") == -1) 395 return; 396 ver_rel -= 26; 397 } 398 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 399 == -1) 400 return; 401 } 402 } 403 } 404 405 static void 406 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 407 { 408 uint32_t desc; 409 410 (void)memcpy(&desc, v, sizeof(desc)); 411 desc = elf_getu32(swap, desc); 412 if (file_printf(ms, ", for FreeBSD") == -1) 413 return; 414 415 /* 416 * Contents is __FreeBSD_version, whose relation to OS 417 * versions is defined by a huge table in the Porter's 418 * Handbook. This is the general scheme: 419 * 420 * Releases: 421 * Mmp000 (before 4.10) 422 * Mmi0p0 (before 5.0) 423 * Mmm0p0 424 * 425 * Development branches: 426 * Mmpxxx (before 4.6) 427 * Mmp1xx (before 4.10) 428 * Mmi1xx (before 5.0) 429 * M000xx (pre-M.0) 430 * Mmm1xx 431 * 432 * M = major version 433 * m = minor version 434 * i = minor version increment (491000 -> 4.10) 435 * p = patchlevel 436 * x = revision 437 * 438 * The first release of FreeBSD to use ELF by default 439 * was version 3.0. 440 */ 441 if (desc == 460002) { 442 if (file_printf(ms, " 4.6.2") == -1) 443 return; 444 } else if (desc < 460100) { 445 if (file_printf(ms, " %d.%d", desc / 100000, 446 desc / 10000 % 10) == -1) 447 return; 448 if (desc / 1000 % 10 > 0) 449 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 450 return; 451 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 452 if (file_printf(ms, " (%d)", desc) == -1) 453 return; 454 } else if (desc < 500000) { 455 if (file_printf(ms, " %d.%d", desc / 100000, 456 desc / 10000 % 10 + desc / 1000 % 10) == -1) 457 return; 458 if (desc / 100 % 10 > 0) { 459 if (file_printf(ms, " (%d)", desc) == -1) 460 return; 461 } else if (desc / 10 % 10 > 0) { 462 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 463 return; 464 } 465 } else { 466 if (file_printf(ms, " %d.%d", desc / 100000, 467 desc / 1000 % 100) == -1) 468 return; 469 if ((desc / 100 % 10 > 0) || 470 (desc % 100000 / 100 == 0)) { 471 if (file_printf(ms, " (%d)", desc) == -1) 472 return; 473 } else if (desc / 10 % 10 > 0) { 474 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 475 return; 476 } 477 } 478 } 479 480 private size_t 481 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 482 int clazz, int swap, size_t align, int *flags) 483 { 484 Elf32_Nhdr nh32; 485 Elf64_Nhdr nh64; 486 size_t noff, doff; 487 #ifdef ELFCORE 488 int os_style = -1; 489 #endif 490 uint32_t namesz, descsz; 491 unsigned char *nbuf = CAST(unsigned char *, vbuf); 492 493 if (xnh_sizeof + offset > size) { 494 /* 495 * We're out of note headers. 496 */ 497 return xnh_sizeof + offset; 498 } 499 500 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 501 offset += xnh_sizeof; 502 503 namesz = xnh_namesz; 504 descsz = xnh_descsz; 505 if ((namesz == 0) && (descsz == 0)) { 506 /* 507 * We're out of note headers. 508 */ 509 return (offset >= size) ? offset : size; 510 } 511 512 if (namesz & 0x80000000) { 513 (void)file_printf(ms, ", bad note name size 0x%lx", 514 (unsigned long)namesz); 515 return 0; 516 } 517 518 if (descsz & 0x80000000) { 519 (void)file_printf(ms, ", bad note description size 0x%lx", 520 (unsigned long)descsz); 521 return 0; 522 } 523 524 525 noff = offset; 526 doff = ELF_ALIGN(offset + namesz); 527 528 if (offset + namesz > size) { 529 /* 530 * We're past the end of the buffer. 531 */ 532 return doff; 533 } 534 535 offset = ELF_ALIGN(doff + descsz); 536 if (doff + descsz > size) { 537 /* 538 * We're past the end of the buffer. 539 */ 540 return (offset >= size) ? offset : size; 541 } 542 543 if ((*flags & (FLAGS_DID_NOTE|FLAGS_DID_BUILD_ID)) == 544 (FLAGS_DID_NOTE|FLAGS_DID_BUILD_ID)) 545 goto core; 546 547 if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 && 548 xnh_type == NT_GNU_VERSION && descsz == 2) { 549 file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]); 550 } 551 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 552 xnh_type == NT_GNU_VERSION && descsz == 16) { 553 uint32_t desc[4]; 554 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 555 556 if (file_printf(ms, ", for GNU/") == -1) 557 return size; 558 switch (elf_getu32(swap, desc[0])) { 559 case GNU_OS_LINUX: 560 if (file_printf(ms, "Linux") == -1) 561 return size; 562 break; 563 case GNU_OS_HURD: 564 if (file_printf(ms, "Hurd") == -1) 565 return size; 566 break; 567 case GNU_OS_SOLARIS: 568 if (file_printf(ms, "Solaris") == -1) 569 return size; 570 break; 571 case GNU_OS_KFREEBSD: 572 if (file_printf(ms, "kFreeBSD") == -1) 573 return size; 574 break; 575 case GNU_OS_KNETBSD: 576 if (file_printf(ms, "kNetBSD") == -1) 577 return size; 578 break; 579 default: 580 if (file_printf(ms, "<unknown>") == -1) 581 return size; 582 } 583 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 584 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 585 return size; 586 *flags |= FLAGS_DID_NOTE; 587 return size; 588 } 589 590 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 591 xnh_type == NT_GNU_BUILD_ID && (descsz == 16 || descsz == 20)) { 592 uint8_t desc[20]; 593 uint32_t i; 594 if (file_printf(ms, ", BuildID[%s]=", descsz == 16 ? "md5/uuid" : 595 "sha1") == -1) 596 return size; 597 (void)memcpy(desc, &nbuf[doff], descsz); 598 for (i = 0; i < descsz; i++) 599 if (file_printf(ms, "%02x", desc[i]) == -1) 600 return size; 601 *flags |= FLAGS_DID_BUILD_ID; 602 } 603 604 if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 && 605 xnh_type == NT_NETBSD_PAX && descsz == 4) { 606 static const char *pax[] = { 607 "+mprotect", 608 "-mprotect", 609 "+segvguard", 610 "-segvguard", 611 "+ASLR", 612 "-ASLR", 613 }; 614 uint32_t desc; 615 size_t i; 616 int did = 0; 617 618 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 619 desc = elf_getu32(swap, desc); 620 621 if (desc && file_printf(ms, ", PaX: ") == -1) 622 return size; 623 624 for (i = 0; i < __arraycount(pax); i++) { 625 if (((1 << i) & desc) == 0) 626 continue; 627 if (file_printf(ms, "%s%s", did++ ? "," : "", 628 pax[i]) == -1) 629 return size; 630 } 631 } 632 633 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 634 switch (xnh_type) { 635 case NT_NETBSD_VERSION: 636 if (descsz == 4) { 637 do_note_netbsd_version(ms, swap, &nbuf[doff]); 638 *flags |= FLAGS_DID_NOTE; 639 return size; 640 } 641 break; 642 case NT_NETBSD_MARCH: 643 if (file_printf(ms, ", compiled for: %.*s", (int)descsz, 644 (const char *)&nbuf[doff]) == -1) 645 return size; 646 break; 647 case NT_NETBSD_CMODEL: 648 if (file_printf(ms, ", compiler model: %.*s", 649 (int)descsz, (const char *)&nbuf[doff]) == -1) 650 return size; 651 break; 652 default: 653 if (file_printf(ms, ", note=%u", xnh_type) == -1) 654 return size; 655 break; 656 } 657 return size; 658 } 659 660 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) { 661 if (xnh_type == NT_FREEBSD_VERSION && descsz == 4) { 662 do_note_freebsd_version(ms, swap, &nbuf[doff]); 663 *flags |= FLAGS_DID_NOTE; 664 return size; 665 } 666 } 667 668 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && 669 xnh_type == NT_OPENBSD_VERSION && descsz == 4) { 670 if (file_printf(ms, ", for OpenBSD") == -1) 671 return size; 672 /* Content of note is always 0 */ 673 *flags |= FLAGS_DID_NOTE; 674 return size; 675 } 676 677 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && 678 xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) { 679 uint32_t desc; 680 if (file_printf(ms, ", for DragonFly") == -1) 681 return size; 682 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 683 desc = elf_getu32(swap, desc); 684 if (file_printf(ms, " %d.%d.%d", desc / 100000, 685 desc / 10000 % 10, desc % 10000) == -1) 686 return size; 687 *flags |= FLAGS_DID_NOTE; 688 return size; 689 } 690 691 core: 692 /* 693 * Sigh. The 2.0.36 kernel in Debian 2.1, at 694 * least, doesn't correctly implement name 695 * sections, in core dumps, as specified by 696 * the "Program Linking" section of "UNIX(R) System 697 * V Release 4 Programmer's Guide: ANSI C and 698 * Programming Support Tools", because my copy 699 * clearly says "The first 'namesz' bytes in 'name' 700 * contain a *null-terminated* [emphasis mine] 701 * character representation of the entry's owner 702 * or originator", but the 2.0.36 kernel code 703 * doesn't include the terminating null in the 704 * name.... 705 */ 706 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || 707 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { 708 os_style = OS_STYLE_SVR4; 709 } 710 711 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { 712 os_style = OS_STYLE_FREEBSD; 713 } 714 715 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) 716 == 0)) { 717 os_style = OS_STYLE_NETBSD; 718 } 719 720 #ifdef ELFCORE 721 if ((*flags & FLAGS_DID_CORE) != 0) 722 return size; 723 724 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 725 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 726 == -1) 727 return size; 728 *flags |= FLAGS_DID_CORE_STYLE; 729 } 730 731 switch (os_style) { 732 case OS_STYLE_NETBSD: 733 if (xnh_type == NT_NETBSD_CORE_PROCINFO) { 734 uint32_t signo; 735 /* 736 * Extract the program name. It is at 737 * offset 0x7c, and is up to 32-bytes, 738 * including the terminating NUL. 739 */ 740 if (file_printf(ms, ", from '%.31s'", 741 &nbuf[doff + 0x7c]) == -1) 742 return size; 743 744 /* 745 * Extract the signal number. It is at 746 * offset 0x08. 747 */ 748 (void)memcpy(&signo, &nbuf[doff + 0x08], 749 sizeof(signo)); 750 if (file_printf(ms, " (signal %u)", 751 elf_getu32(swap, signo)) == -1) 752 return size; 753 *flags |= FLAGS_DID_CORE; 754 return size; 755 } 756 break; 757 758 default: 759 if (xnh_type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 760 size_t i, j; 761 unsigned char c; 762 /* 763 * Extract the program name. We assume 764 * it to be 16 characters (that's what it 765 * is in SunOS 5.x and Linux). 766 * 767 * Unfortunately, it's at a different offset 768 * in various OSes, so try multiple offsets. 769 * If the characters aren't all printable, 770 * reject it. 771 */ 772 for (i = 0; i < NOFFSETS; i++) { 773 unsigned char *cname, *cp; 774 size_t reloffset = prpsoffsets(i); 775 size_t noffset = doff + reloffset; 776 size_t k; 777 for (j = 0; j < 16; j++, noffset++, 778 reloffset++) { 779 /* 780 * Make sure we're not past 781 * the end of the buffer; if 782 * we are, just give up. 783 */ 784 if (noffset >= size) 785 goto tryanother; 786 787 /* 788 * Make sure we're not past 789 * the end of the contents; 790 * if we are, this obviously 791 * isn't the right offset. 792 */ 793 if (reloffset >= descsz) 794 goto tryanother; 795 796 c = nbuf[noffset]; 797 if (c == '\0') { 798 /* 799 * A '\0' at the 800 * beginning is 801 * obviously wrong. 802 * Any other '\0' 803 * means we're done. 804 */ 805 if (j == 0) 806 goto tryanother; 807 else 808 break; 809 } else { 810 /* 811 * A nonprintable 812 * character is also 813 * wrong. 814 */ 815 if (!isprint(c) || isquote(c)) 816 goto tryanother; 817 } 818 } 819 /* 820 * Well, that worked. 821 */ 822 823 /* 824 * Try next offsets, in case this match is 825 * in the middle of a string. 826 */ 827 for (k = i + 1 ; k < NOFFSETS ; k++) { 828 size_t no; 829 int adjust = 1; 830 if (prpsoffsets(k) >= prpsoffsets(i)) 831 continue; 832 for (no = doff + prpsoffsets(k); 833 no < doff + prpsoffsets(i); no++) 834 adjust = adjust 835 && isprint(nbuf[no]); 836 if (adjust) 837 i = k; 838 } 839 840 cname = (unsigned char *) 841 &nbuf[doff + prpsoffsets(i)]; 842 for (cp = cname; *cp && isprint(*cp); cp++) 843 continue; 844 /* 845 * Linux apparently appends a space at the end 846 * of the command line: remove it. 847 */ 848 while (cp > cname && isspace(cp[-1])) 849 cp--; 850 if (file_printf(ms, ", from '%.*s'", 851 (int)(cp - cname), cname) == -1) 852 return size; 853 *flags |= FLAGS_DID_CORE; 854 return size; 855 856 tryanother: 857 ; 858 } 859 } 860 break; 861 } 862 #endif 863 return offset; 864 } 865 866 /* SunOS 5.x hardware capability descriptions */ 867 typedef struct cap_desc { 868 uint64_t cd_mask; 869 const char *cd_name; 870 } cap_desc_t; 871 872 static const cap_desc_t cap_desc_sparc[] = { 873 { AV_SPARC_MUL32, "MUL32" }, 874 { AV_SPARC_DIV32, "DIV32" }, 875 { AV_SPARC_FSMULD, "FSMULD" }, 876 { AV_SPARC_V8PLUS, "V8PLUS" }, 877 { AV_SPARC_POPC, "POPC" }, 878 { AV_SPARC_VIS, "VIS" }, 879 { AV_SPARC_VIS2, "VIS2" }, 880 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 881 { AV_SPARC_FMAF, "FMAF" }, 882 { AV_SPARC_FJFMAU, "FJFMAU" }, 883 { AV_SPARC_IMA, "IMA" }, 884 { 0, NULL } 885 }; 886 887 static const cap_desc_t cap_desc_386[] = { 888 { AV_386_FPU, "FPU" }, 889 { AV_386_TSC, "TSC" }, 890 { AV_386_CX8, "CX8" }, 891 { AV_386_SEP, "SEP" }, 892 { AV_386_AMD_SYSC, "AMD_SYSC" }, 893 { AV_386_CMOV, "CMOV" }, 894 { AV_386_MMX, "MMX" }, 895 { AV_386_AMD_MMX, "AMD_MMX" }, 896 { AV_386_AMD_3DNow, "AMD_3DNow" }, 897 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 898 { AV_386_FXSR, "FXSR" }, 899 { AV_386_SSE, "SSE" }, 900 { AV_386_SSE2, "SSE2" }, 901 { AV_386_PAUSE, "PAUSE" }, 902 { AV_386_SSE3, "SSE3" }, 903 { AV_386_MON, "MON" }, 904 { AV_386_CX16, "CX16" }, 905 { AV_386_AHF, "AHF" }, 906 { AV_386_TSCP, "TSCP" }, 907 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 908 { AV_386_POPCNT, "POPCNT" }, 909 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 910 { AV_386_SSSE3, "SSSE3" }, 911 { AV_386_SSE4_1, "SSE4.1" }, 912 { AV_386_SSE4_2, "SSE4.2" }, 913 { 0, NULL } 914 }; 915 916 private int 917 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 918 size_t size, off_t fsize, int *flags, int mach, int strtab) 919 { 920 Elf32_Shdr sh32; 921 Elf64_Shdr sh64; 922 int stripped = 1; 923 size_t nbadcap = 0; 924 void *nbuf; 925 off_t noff, coff, name_off; 926 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */ 927 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */ 928 char name[50]; 929 930 if (size != xsh_sizeof) { 931 if (file_printf(ms, ", corrupted section header size") == -1) 932 return -1; 933 return 0; 934 } 935 936 /* Read offset of name section to be able to read section names later */ 937 if (pread(fd, xsh_addr, xsh_sizeof, off + size * strtab) == -1) { 938 file_badread(ms); 939 return -1; 940 } 941 name_off = xsh_offset; 942 943 for ( ; num; num--) { 944 /* Read the name of this section. */ 945 if (pread(fd, name, sizeof(name), name_off + xsh_name) == -1) { 946 file_badread(ms); 947 return -1; 948 } 949 name[sizeof(name) - 1] = '\0'; 950 if (strcmp(name, ".debug_info") == 0) 951 stripped = 0; 952 953 if (pread(fd, xsh_addr, xsh_sizeof, off) == -1) { 954 file_badread(ms); 955 return -1; 956 } 957 off += size; 958 959 /* Things we can determine before we seek */ 960 switch (xsh_type) { 961 case SHT_SYMTAB: 962 #if 0 963 case SHT_DYNSYM: 964 #endif 965 stripped = 0; 966 break; 967 default: 968 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 969 /* Perhaps warn here */ 970 continue; 971 } 972 break; 973 } 974 975 /* Things we can determine when we seek */ 976 switch (xsh_type) { 977 case SHT_NOTE: 978 if ((nbuf = malloc(xsh_size)) == NULL) { 979 file_error(ms, errno, "Cannot allocate memory" 980 " for note"); 981 return -1; 982 } 983 if (pread(fd, nbuf, xsh_size, xsh_offset) == -1) { 984 file_badread(ms); 985 free(nbuf); 986 return -1; 987 } 988 989 noff = 0; 990 for (;;) { 991 if (noff >= (off_t)xsh_size) 992 break; 993 noff = donote(ms, nbuf, (size_t)noff, 994 xsh_size, clazz, swap, 4, flags); 995 if (noff == 0) 996 break; 997 } 998 free(nbuf); 999 break; 1000 case SHT_SUNW_cap: 1001 switch (mach) { 1002 case EM_SPARC: 1003 case EM_SPARCV9: 1004 case EM_IA_64: 1005 case EM_386: 1006 case EM_AMD64: 1007 break; 1008 default: 1009 goto skip; 1010 } 1011 1012 if (nbadcap > 5) 1013 break; 1014 if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) { 1015 file_badseek(ms); 1016 return -1; 1017 } 1018 coff = 0; 1019 for (;;) { 1020 Elf32_Cap cap32; 1021 Elf64_Cap cap64; 1022 char cbuf[/*CONSTCOND*/ 1023 MAX(sizeof cap32, sizeof cap64)]; 1024 if ((coff += xcap_sizeof) > (off_t)xsh_size) 1025 break; 1026 if (read(fd, cbuf, (size_t)xcap_sizeof) != 1027 (ssize_t)xcap_sizeof) { 1028 file_badread(ms); 1029 return -1; 1030 } 1031 if (cbuf[0] == 'A') { 1032 #ifdef notyet 1033 char *p = cbuf + 1; 1034 uint32_t len, tag; 1035 memcpy(&len, p, sizeof(len)); 1036 p += 4; 1037 len = getu32(swap, len); 1038 if (memcmp("gnu", p, 3) != 0) { 1039 if (file_printf(ms, 1040 ", unknown capability %.3s", p) 1041 == -1) 1042 return -1; 1043 break; 1044 } 1045 p += strlen(p) + 1; 1046 tag = *p++; 1047 memcpy(&len, p, sizeof(len)); 1048 p += 4; 1049 len = getu32(swap, len); 1050 if (tag != 1) { 1051 if (file_printf(ms, ", unknown gnu" 1052 " capability tag %d", tag) 1053 == -1) 1054 return -1; 1055 break; 1056 } 1057 // gnu attributes 1058 #endif 1059 break; 1060 } 1061 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 1062 switch (xcap_tag) { 1063 case CA_SUNW_NULL: 1064 break; 1065 case CA_SUNW_HW_1: 1066 cap_hw1 |= xcap_val; 1067 break; 1068 case CA_SUNW_SF_1: 1069 cap_sf1 |= xcap_val; 1070 break; 1071 default: 1072 if (file_printf(ms, 1073 ", with unknown capability " 1074 "0x%" INT64_T_FORMAT "x = 0x%" 1075 INT64_T_FORMAT "x", 1076 (unsigned long long)xcap_tag, 1077 (unsigned long long)xcap_val) == -1) 1078 return -1; 1079 if (nbadcap++ > 2) 1080 coff = xsh_size; 1081 break; 1082 } 1083 } 1084 /*FALLTHROUGH*/ 1085 skip: 1086 default: 1087 break; 1088 } 1089 } 1090 1091 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1092 return -1; 1093 if (cap_hw1) { 1094 const cap_desc_t *cdp; 1095 switch (mach) { 1096 case EM_SPARC: 1097 case EM_SPARC32PLUS: 1098 case EM_SPARCV9: 1099 cdp = cap_desc_sparc; 1100 break; 1101 case EM_386: 1102 case EM_IA_64: 1103 case EM_AMD64: 1104 cdp = cap_desc_386; 1105 break; 1106 default: 1107 cdp = NULL; 1108 break; 1109 } 1110 if (file_printf(ms, ", uses") == -1) 1111 return -1; 1112 if (cdp) { 1113 while (cdp->cd_name) { 1114 if (cap_hw1 & cdp->cd_mask) { 1115 if (file_printf(ms, 1116 " %s", cdp->cd_name) == -1) 1117 return -1; 1118 cap_hw1 &= ~cdp->cd_mask; 1119 } 1120 ++cdp; 1121 } 1122 if (cap_hw1) 1123 if (file_printf(ms, 1124 " unknown hardware capability 0x%" 1125 INT64_T_FORMAT "x", 1126 (unsigned long long)cap_hw1) == -1) 1127 return -1; 1128 } else { 1129 if (file_printf(ms, 1130 " hardware capability 0x%" INT64_T_FORMAT "x", 1131 (unsigned long long)cap_hw1) == -1) 1132 return -1; 1133 } 1134 } 1135 if (cap_sf1) { 1136 if (cap_sf1 & SF1_SUNW_FPUSED) { 1137 if (file_printf(ms, 1138 (cap_sf1 & SF1_SUNW_FPKNWN) 1139 ? ", uses frame pointer" 1140 : ", not known to use frame pointer") == -1) 1141 return -1; 1142 } 1143 cap_sf1 &= ~SF1_SUNW_MASK; 1144 if (cap_sf1) 1145 if (file_printf(ms, 1146 ", with unknown software capability 0x%" 1147 INT64_T_FORMAT "x", 1148 (unsigned long long)cap_sf1) == -1) 1149 return -1; 1150 } 1151 return 0; 1152 } 1153 1154 /* 1155 * Look through the program headers of an executable image, searching 1156 * for a PT_INTERP section; if one is found, it's dynamically linked, 1157 * otherwise it's statically linked. 1158 */ 1159 private int 1160 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1161 int num, size_t size, off_t fsize, int *flags, int sh_num) 1162 { 1163 Elf32_Phdr ph32; 1164 Elf64_Phdr ph64; 1165 const char *linking_style = "statically"; 1166 const char *shared_libraries = ""; 1167 unsigned char nbuf[BUFSIZ]; 1168 ssize_t bufsize; 1169 size_t offset, align, len; 1170 1171 if (size != xph_sizeof) { 1172 if (file_printf(ms, ", corrupted program header size") == -1) 1173 return -1; 1174 return 0; 1175 } 1176 1177 for ( ; num; num--) { 1178 if (pread(fd, xph_addr, xph_sizeof, off) == -1) { 1179 file_badread(ms); 1180 return -1; 1181 } 1182 1183 off += size; 1184 1185 /* Things we can determine before we seek */ 1186 switch (xph_type) { 1187 case PT_DYNAMIC: 1188 linking_style = "dynamically"; 1189 break; 1190 case PT_INTERP: 1191 shared_libraries = " (uses shared libs)"; 1192 break; 1193 default: 1194 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1195 /* Maybe warn here? */ 1196 continue; 1197 } 1198 break; 1199 } 1200 1201 /* Things we can determine when we seek */ 1202 switch (xph_type) { 1203 case PT_NOTE: 1204 if (((align = xph_align) & 0x80000000UL) != 0 || 1205 align < 4) { 1206 if (file_printf(ms, 1207 ", invalid note alignment 0x%lx", 1208 (unsigned long)align) == -1) 1209 return -1; 1210 align = 4; 1211 } 1212 if (sh_num) 1213 break; 1214 /* 1215 * This is a PT_NOTE section; loop through all the notes 1216 * in the section. 1217 */ 1218 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1219 : sizeof(nbuf); 1220 bufsize = pread(fd, nbuf, len, xph_offset); 1221 if (bufsize == -1) { 1222 file_badread(ms); 1223 return -1; 1224 } 1225 offset = 0; 1226 for (;;) { 1227 if (offset >= (size_t)bufsize) 1228 break; 1229 offset = donote(ms, nbuf, offset, 1230 (size_t)bufsize, clazz, swap, align, 1231 flags); 1232 if (offset == 0) 1233 break; 1234 } 1235 break; 1236 default: 1237 break; 1238 } 1239 } 1240 if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries) 1241 == -1) 1242 return -1; 1243 return 0; 1244 } 1245 1246 1247 protected int 1248 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, 1249 size_t nbytes) 1250 { 1251 union { 1252 int32_t l; 1253 char c[sizeof (int32_t)]; 1254 } u; 1255 int clazz; 1256 int swap; 1257 struct stat st; 1258 off_t fsize; 1259 int flags = 0; 1260 Elf32_Ehdr elf32hdr; 1261 Elf64_Ehdr elf64hdr; 1262 uint16_t type, phnum, shnum; 1263 1264 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) 1265 return 0; 1266 /* 1267 * ELF executables have multiple section headers in arbitrary 1268 * file locations and thus file(1) cannot determine it from easily. 1269 * Instead we traverse thru all section headers until a symbol table 1270 * one is found or else the binary is stripped. 1271 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1272 */ 1273 if (buf[EI_MAG0] != ELFMAG0 1274 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1275 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1276 return 0; 1277 1278 /* 1279 * If we cannot seek, it must be a pipe, socket or fifo. 1280 */ 1281 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1282 fd = file_pipe2file(ms, fd, buf, nbytes); 1283 1284 if (fstat(fd, &st) == -1) { 1285 file_badread(ms); 1286 return -1; 1287 } 1288 if (S_ISREG(st.st_mode) || st.st_size != 0) 1289 fsize = st.st_size; 1290 else 1291 fsize = SIZE_UNKNOWN; 1292 1293 clazz = buf[EI_CLASS]; 1294 1295 switch (clazz) { 1296 case ELFCLASS32: 1297 #undef elf_getu 1298 #define elf_getu(a, b) elf_getu32(a, b) 1299 #undef elfhdr 1300 #define elfhdr elf32hdr 1301 #include "elfclass.h" 1302 case ELFCLASS64: 1303 #undef elf_getu 1304 #define elf_getu(a, b) elf_getu64(a, b) 1305 #undef elfhdr 1306 #define elfhdr elf64hdr 1307 #include "elfclass.h" 1308 default: 1309 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1310 return -1; 1311 break; 1312 } 1313 return 0; 1314 } 1315 #endif 1316