1 /* $NetBSD: readelf.c,v 1.9 2014/06/13 13:38:52 joerg Exp $ */ 2 /* 3 * Copyright (c) Christos Zoulas 2003. 4 * All Rights Reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice immediately at the beginning of the file, without modification, 11 * this list of conditions, and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 #include "file.h" 29 30 #ifndef lint 31 #if 0 32 FILE_RCSID("@(#)$File: readelf.c,v 1.103 2014/05/02 02:25:10 christos Exp $") 33 #else 34 __RCSID("$NetBSD: readelf.c,v 1.9 2014/06/13 13:38:52 joerg Exp $"); 35 #endif 36 #endif 37 38 #ifdef BUILTIN_ELF 39 #include <string.h> 40 #include <ctype.h> 41 #include <stdlib.h> 42 #ifdef HAVE_UNISTD_H 43 #include <unistd.h> 44 #endif 45 46 #include "readelf.h" 47 #include "magic.h" 48 49 #ifdef ELFCORE 50 private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t, 51 off_t, int *); 52 #endif 53 private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t, 54 off_t, int *, int); 55 private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, 56 off_t, int *, int, int); 57 private size_t donote(struct magic_set *, void *, size_t, size_t, int, 58 int, size_t, int *); 59 60 #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) 61 62 #define isquote(c) (strchr("'\"`", (c)) != NULL) 63 64 private uint16_t getu16(int, uint16_t); 65 private uint32_t getu32(int, uint32_t); 66 private uint64_t getu64(int, uint64_t); 67 68 private uint16_t 69 getu16(int swap, uint16_t value) 70 { 71 union { 72 uint16_t ui; 73 char c[2]; 74 } retval, tmpval; 75 76 if (swap) { 77 tmpval.ui = value; 78 79 retval.c[0] = tmpval.c[1]; 80 retval.c[1] = tmpval.c[0]; 81 82 return retval.ui; 83 } else 84 return value; 85 } 86 87 private uint32_t 88 getu32(int swap, uint32_t value) 89 { 90 union { 91 uint32_t ui; 92 char c[4]; 93 } retval, tmpval; 94 95 if (swap) { 96 tmpval.ui = value; 97 98 retval.c[0] = tmpval.c[3]; 99 retval.c[1] = tmpval.c[2]; 100 retval.c[2] = tmpval.c[1]; 101 retval.c[3] = tmpval.c[0]; 102 103 return retval.ui; 104 } else 105 return value; 106 } 107 108 private uint64_t 109 getu64(int swap, uint64_t value) 110 { 111 union { 112 uint64_t ui; 113 char c[8]; 114 } retval, tmpval; 115 116 if (swap) { 117 tmpval.ui = value; 118 119 retval.c[0] = tmpval.c[7]; 120 retval.c[1] = tmpval.c[6]; 121 retval.c[2] = tmpval.c[5]; 122 retval.c[3] = tmpval.c[4]; 123 retval.c[4] = tmpval.c[3]; 124 retval.c[5] = tmpval.c[2]; 125 retval.c[6] = tmpval.c[1]; 126 retval.c[7] = tmpval.c[0]; 127 128 return retval.ui; 129 } else 130 return value; 131 } 132 133 #define elf_getu16(swap, value) getu16(swap, value) 134 #define elf_getu32(swap, value) getu32(swap, value) 135 #define elf_getu64(swap, value) getu64(swap, value) 136 137 #define xsh_addr (clazz == ELFCLASS32 \ 138 ? (void *)&sh32 \ 139 : (void *)&sh64) 140 #define xsh_sizeof (clazz == ELFCLASS32 \ 141 ? sizeof(sh32) \ 142 : sizeof(sh64)) 143 #define xsh_size (size_t)(clazz == ELFCLASS32 \ 144 ? elf_getu32(swap, sh32.sh_size) \ 145 : elf_getu64(swap, sh64.sh_size)) 146 #define xsh_offset (off_t)(clazz == ELFCLASS32 \ 147 ? elf_getu32(swap, sh32.sh_offset) \ 148 : elf_getu64(swap, sh64.sh_offset)) 149 #define xsh_type (clazz == ELFCLASS32 \ 150 ? elf_getu32(swap, sh32.sh_type) \ 151 : elf_getu32(swap, sh64.sh_type)) 152 #define xsh_name (clazz == ELFCLASS32 \ 153 ? elf_getu32(swap, sh32.sh_name) \ 154 : elf_getu32(swap, sh64.sh_name)) 155 #define xph_addr (clazz == ELFCLASS32 \ 156 ? (void *) &ph32 \ 157 : (void *) &ph64) 158 #define xph_sizeof (clazz == ELFCLASS32 \ 159 ? sizeof(ph32) \ 160 : sizeof(ph64)) 161 #define xph_type (clazz == ELFCLASS32 \ 162 ? elf_getu32(swap, ph32.p_type) \ 163 : elf_getu32(swap, ph64.p_type)) 164 #define xph_offset (off_t)(clazz == ELFCLASS32 \ 165 ? elf_getu32(swap, ph32.p_offset) \ 166 : elf_getu64(swap, ph64.p_offset)) 167 #define xph_align (size_t)((clazz == ELFCLASS32 \ 168 ? (off_t) (ph32.p_align ? \ 169 elf_getu32(swap, ph32.p_align) : 4) \ 170 : (off_t) (ph64.p_align ? \ 171 elf_getu64(swap, ph64.p_align) : 4))) 172 #define xph_filesz (size_t)((clazz == ELFCLASS32 \ 173 ? elf_getu32(swap, ph32.p_filesz) \ 174 : elf_getu64(swap, ph64.p_filesz))) 175 #define xnh_addr (clazz == ELFCLASS32 \ 176 ? (void *)&nh32 \ 177 : (void *)&nh64) 178 #define xph_memsz (size_t)((clazz == ELFCLASS32 \ 179 ? elf_getu32(swap, ph32.p_memsz) \ 180 : elf_getu64(swap, ph64.p_memsz))) 181 #define xnh_sizeof (clazz == ELFCLASS32 \ 182 ? sizeof nh32 \ 183 : sizeof nh64) 184 #define xnh_type (clazz == ELFCLASS32 \ 185 ? elf_getu32(swap, nh32.n_type) \ 186 : elf_getu32(swap, nh64.n_type)) 187 #define xnh_namesz (clazz == ELFCLASS32 \ 188 ? elf_getu32(swap, nh32.n_namesz) \ 189 : elf_getu32(swap, nh64.n_namesz)) 190 #define xnh_descsz (clazz == ELFCLASS32 \ 191 ? elf_getu32(swap, nh32.n_descsz) \ 192 : elf_getu32(swap, nh64.n_descsz)) 193 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 194 ? prpsoffsets32[i] \ 195 : prpsoffsets64[i]) 196 #define xcap_addr (clazz == ELFCLASS32 \ 197 ? (void *)&cap32 \ 198 : (void *)&cap64) 199 #define xcap_sizeof (clazz == ELFCLASS32 \ 200 ? sizeof cap32 \ 201 : sizeof cap64) 202 #define xcap_tag (clazz == ELFCLASS32 \ 203 ? elf_getu32(swap, cap32.c_tag) \ 204 : elf_getu64(swap, cap64.c_tag)) 205 #define xcap_val (clazz == ELFCLASS32 \ 206 ? elf_getu32(swap, cap32.c_un.c_val) \ 207 : elf_getu64(swap, cap64.c_un.c_val)) 208 209 #ifdef ELFCORE 210 /* 211 * Try larger offsets first to avoid false matches 212 * from earlier data that happen to look like strings. 213 */ 214 static const size_t prpsoffsets32[] = { 215 #ifdef USE_NT_PSINFO 216 104, /* SunOS 5.x (command line) */ 217 88, /* SunOS 5.x (short name) */ 218 #endif /* USE_NT_PSINFO */ 219 220 100, /* SunOS 5.x (command line) */ 221 84, /* SunOS 5.x (short name) */ 222 223 44, /* Linux (command line) */ 224 28, /* Linux 2.0.36 (short name) */ 225 226 8, /* FreeBSD */ 227 }; 228 229 static const size_t prpsoffsets64[] = { 230 #ifdef USE_NT_PSINFO 231 152, /* SunOS 5.x (command line) */ 232 136, /* SunOS 5.x (short name) */ 233 #endif /* USE_NT_PSINFO */ 234 235 136, /* SunOS 5.x, 64-bit (command line) */ 236 120, /* SunOS 5.x, 64-bit (short name) */ 237 238 56, /* Linux (command line) */ 239 40, /* Linux (tested on core from 2.4.x, short name) */ 240 241 16, /* FreeBSD, 64-bit */ 242 }; 243 244 #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0]) 245 #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0]) 246 247 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 248 249 /* 250 * Look through the program headers of an executable image, searching 251 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 252 * "FreeBSD"; if one is found, try looking in various places in its 253 * contents for a 16-character string containing only printable 254 * characters - if found, that string should be the name of the program 255 * that dropped core. Note: right after that 16-character string is, 256 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 257 * Linux, a longer string (80 characters, in 5.x, probably other 258 * SVR4-flavored systems, and Linux) containing the start of the 259 * command line for that program. 260 * 261 * SunOS 5.x core files contain two PT_NOTE sections, with the types 262 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 263 * same info about the command name and command line, so it probably 264 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 265 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 266 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 267 * the SunOS 5.x file command relies on this (and prefers the latter). 268 * 269 * The signal number probably appears in a section of type NT_PRSTATUS, 270 * but that's also rather OS-dependent, in ways that are harder to 271 * dissect with heuristics, so I'm not bothering with the signal number. 272 * (I suppose the signal number could be of interest in situations where 273 * you don't have the binary of the program that dropped core; if you 274 * *do* have that binary, the debugger will probably tell you what 275 * signal it was.) 276 */ 277 278 #define OS_STYLE_SVR4 0 279 #define OS_STYLE_FREEBSD 1 280 #define OS_STYLE_NETBSD 2 281 282 private const char os_style_names[][8] = { 283 "SVR4", 284 "FreeBSD", 285 "NetBSD", 286 }; 287 288 #define FLAGS_DID_CORE 0x01 289 #define FLAGS_DID_NOTE 0x02 290 #define FLAGS_DID_BUILD_ID 0x04 291 #define FLAGS_DID_CORE_STYLE 0x08 292 #define FLAGS_IS_CORE 0x10 293 294 private int 295 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 296 int num, size_t size, off_t fsize, int *flags) 297 { 298 Elf32_Phdr ph32; 299 Elf64_Phdr ph64; 300 size_t offset, len; 301 unsigned char nbuf[BUFSIZ]; 302 ssize_t bufsize; 303 304 if (size != xph_sizeof) { 305 if (file_printf(ms, ", corrupted program header size") == -1) 306 return -1; 307 return 0; 308 } 309 310 /* 311 * Loop through all the program headers. 312 */ 313 for ( ; num; num--) { 314 if (pread(fd, xph_addr, xph_sizeof, off) == -1) { 315 file_badread(ms); 316 return -1; 317 } 318 off += size; 319 320 if (xph_offset > fsize) { 321 /* Perhaps warn here */ 322 continue; 323 } 324 325 if (xph_type != PT_NOTE) 326 continue; 327 328 /* 329 * This is a PT_NOTE section; loop through all the notes 330 * in the section. 331 */ 332 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 333 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) { 334 file_badread(ms); 335 return -1; 336 } 337 offset = 0; 338 for (;;) { 339 if (offset >= (size_t)bufsize) 340 break; 341 offset = donote(ms, nbuf, offset, (size_t)bufsize, 342 clazz, swap, 4, flags); 343 if (offset == 0) 344 break; 345 346 } 347 } 348 return 0; 349 } 350 #endif 351 352 static void 353 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 354 { 355 uint32_t desc; 356 (void)memcpy(&desc, v, sizeof(desc)); 357 desc = elf_getu32(swap, desc); 358 359 if (file_printf(ms, ", for NetBSD") == -1) 360 return; 361 /* 362 * The version number used to be stuck as 199905, and was thus 363 * basically content-free. Newer versions of NetBSD have fixed 364 * this and now use the encoding of __NetBSD_Version__: 365 * 366 * MMmmrrpp00 367 * 368 * M = major version 369 * m = minor version 370 * r = release ["",A-Z,Z[A-Z] but numeric] 371 * p = patchlevel 372 */ 373 if (desc > 100000000U) { 374 uint32_t ver_patch = (desc / 100) % 100; 375 uint32_t ver_rel = (desc / 10000) % 100; 376 uint32_t ver_min = (desc / 1000000) % 100; 377 uint32_t ver_maj = desc / 100000000; 378 379 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 380 return; 381 if (ver_rel == 0 && ver_patch != 0) { 382 if (file_printf(ms, ".%u", ver_patch) == -1) 383 return; 384 } else if (ver_rel != 0) { 385 while (ver_rel > 26) { 386 if (file_printf(ms, "Z") == -1) 387 return; 388 ver_rel -= 26; 389 } 390 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 391 == -1) 392 return; 393 } 394 } 395 } 396 397 static void 398 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 399 { 400 uint32_t desc; 401 402 (void)memcpy(&desc, v, sizeof(desc)); 403 desc = elf_getu32(swap, desc); 404 if (file_printf(ms, ", for FreeBSD") == -1) 405 return; 406 407 /* 408 * Contents is __FreeBSD_version, whose relation to OS 409 * versions is defined by a huge table in the Porter's 410 * Handbook. This is the general scheme: 411 * 412 * Releases: 413 * Mmp000 (before 4.10) 414 * Mmi0p0 (before 5.0) 415 * Mmm0p0 416 * 417 * Development branches: 418 * Mmpxxx (before 4.6) 419 * Mmp1xx (before 4.10) 420 * Mmi1xx (before 5.0) 421 * M000xx (pre-M.0) 422 * Mmm1xx 423 * 424 * M = major version 425 * m = minor version 426 * i = minor version increment (491000 -> 4.10) 427 * p = patchlevel 428 * x = revision 429 * 430 * The first release of FreeBSD to use ELF by default 431 * was version 3.0. 432 */ 433 if (desc == 460002) { 434 if (file_printf(ms, " 4.6.2") == -1) 435 return; 436 } else if (desc < 460100) { 437 if (file_printf(ms, " %d.%d", desc / 100000, 438 desc / 10000 % 10) == -1) 439 return; 440 if (desc / 1000 % 10 > 0) 441 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 442 return; 443 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 444 if (file_printf(ms, " (%d)", desc) == -1) 445 return; 446 } else if (desc < 500000) { 447 if (file_printf(ms, " %d.%d", desc / 100000, 448 desc / 10000 % 10 + desc / 1000 % 10) == -1) 449 return; 450 if (desc / 100 % 10 > 0) { 451 if (file_printf(ms, " (%d)", desc) == -1) 452 return; 453 } else if (desc / 10 % 10 > 0) { 454 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 455 return; 456 } 457 } else { 458 if (file_printf(ms, " %d.%d", desc / 100000, 459 desc / 1000 % 100) == -1) 460 return; 461 if ((desc / 100 % 10 > 0) || 462 (desc % 100000 / 100 == 0)) { 463 if (file_printf(ms, " (%d)", desc) == -1) 464 return; 465 } else if (desc / 10 % 10 > 0) { 466 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 467 return; 468 } 469 } 470 } 471 472 private size_t 473 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 474 int clazz, int swap, size_t align, int *flags) 475 { 476 Elf32_Nhdr nh32 = { 0, 0, 0 }; 477 Elf64_Nhdr nh64 = { 0, 0, 0 }; 478 size_t noff, doff; 479 #ifdef ELFCORE 480 int os_style = -1; 481 #endif 482 uint32_t namesz, descsz; 483 unsigned char *nbuf = CAST(unsigned char *, vbuf); 484 485 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 486 offset += xnh_sizeof; 487 488 namesz = xnh_namesz; 489 descsz = xnh_descsz; 490 if ((namesz == 0) && (descsz == 0)) { 491 /* 492 * We're out of note headers. 493 */ 494 return (offset >= size) ? offset : size; 495 } 496 497 if (namesz & 0x80000000) { 498 (void)file_printf(ms, ", bad note name size 0x%lx", 499 (unsigned long)namesz); 500 return offset; 501 } 502 503 if (descsz & 0x80000000) { 504 (void)file_printf(ms, ", bad note description size 0x%lx", 505 (unsigned long)descsz); 506 return offset; 507 } 508 509 510 noff = offset; 511 doff = ELF_ALIGN(offset + namesz); 512 513 if (offset + namesz > size) { 514 /* 515 * We're past the end of the buffer. 516 */ 517 return doff; 518 } 519 520 offset = ELF_ALIGN(doff + descsz); 521 if (doff + descsz > size) { 522 /* 523 * We're past the end of the buffer. 524 */ 525 return (offset >= size) ? offset : size; 526 } 527 528 if ((*flags & (FLAGS_DID_NOTE|FLAGS_DID_BUILD_ID)) == 529 (FLAGS_DID_NOTE|FLAGS_DID_BUILD_ID)) 530 goto core; 531 532 if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 && 533 xnh_type == NT_GNU_VERSION && descsz == 2) { 534 file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]); 535 } 536 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 537 xnh_type == NT_GNU_VERSION && descsz == 16) { 538 uint32_t desc[4]; 539 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 540 541 if (file_printf(ms, ", for GNU/") == -1) 542 return size; 543 switch (elf_getu32(swap, desc[0])) { 544 case GNU_OS_LINUX: 545 if (file_printf(ms, "Linux") == -1) 546 return size; 547 break; 548 case GNU_OS_HURD: 549 if (file_printf(ms, "Hurd") == -1) 550 return size; 551 break; 552 case GNU_OS_SOLARIS: 553 if (file_printf(ms, "Solaris") == -1) 554 return size; 555 break; 556 case GNU_OS_KFREEBSD: 557 if (file_printf(ms, "kFreeBSD") == -1) 558 return size; 559 break; 560 case GNU_OS_KNETBSD: 561 if (file_printf(ms, "kNetBSD") == -1) 562 return size; 563 break; 564 default: 565 if (file_printf(ms, "<unknown>") == -1) 566 return size; 567 } 568 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 569 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 570 return size; 571 *flags |= FLAGS_DID_NOTE; 572 return size; 573 } 574 575 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 576 xnh_type == NT_GNU_BUILD_ID && (descsz == 16 || descsz == 20)) { 577 uint8_t desc[20]; 578 uint32_t i; 579 if (file_printf(ms, ", BuildID[%s]=", descsz == 16 ? "md5/uuid" : 580 "sha1") == -1) 581 return size; 582 (void)memcpy(desc, &nbuf[doff], descsz); 583 for (i = 0; i < descsz; i++) 584 if (file_printf(ms, "%02x", desc[i]) == -1) 585 return size; 586 *flags |= FLAGS_DID_BUILD_ID; 587 } 588 589 if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 && 590 xnh_type == NT_NETBSD_PAX && descsz == 4) { 591 static const char *pax[] = { 592 "+mprotect", 593 "-mprotect", 594 "+segvguard", 595 "-segvguard", 596 "+ASLR", 597 "-ASLR", 598 }; 599 uint32_t desc; 600 size_t i; 601 int did = 0; 602 603 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 604 desc = elf_getu32(swap, desc); 605 606 if (desc && file_printf(ms, ", PaX: ") == -1) 607 return size; 608 609 for (i = 0; i < __arraycount(pax); i++) { 610 if (((1 << i) & desc) == 0) 611 continue; 612 if (file_printf(ms, "%s%s", did++ ? "," : "", 613 pax[i]) == -1) 614 return size; 615 } 616 } 617 618 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 619 switch (xnh_type) { 620 case NT_NETBSD_VERSION: 621 if (descsz == 4) { 622 do_note_netbsd_version(ms, swap, &nbuf[doff]); 623 *flags |= FLAGS_DID_NOTE; 624 return size; 625 } 626 break; 627 case NT_NETBSD_MARCH: 628 if (file_printf(ms, ", compiled for: %.*s", (int)descsz, 629 (const char *)&nbuf[doff]) == -1) 630 return size; 631 break; 632 case NT_NETBSD_CMODEL: 633 if (file_printf(ms, ", compiler model: %.*s", 634 (int)descsz, (const char *)&nbuf[doff]) == -1) 635 return size; 636 break; 637 default: 638 if (file_printf(ms, ", note=%u", xnh_type) == -1) 639 return size; 640 break; 641 } 642 return size; 643 } 644 645 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) { 646 if (xnh_type == NT_FREEBSD_VERSION && descsz == 4) { 647 do_note_freebsd_version(ms, swap, &nbuf[doff]); 648 *flags |= FLAGS_DID_NOTE; 649 return size; 650 } 651 } 652 653 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && 654 xnh_type == NT_OPENBSD_VERSION && descsz == 4) { 655 if (file_printf(ms, ", for OpenBSD") == -1) 656 return size; 657 /* Content of note is always 0 */ 658 *flags |= FLAGS_DID_NOTE; 659 return size; 660 } 661 662 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && 663 xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) { 664 uint32_t desc; 665 if (file_printf(ms, ", for DragonFly") == -1) 666 return size; 667 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 668 desc = elf_getu32(swap, desc); 669 if (file_printf(ms, " %d.%d.%d", desc / 100000, 670 desc / 10000 % 10, desc % 10000) == -1) 671 return size; 672 *flags |= FLAGS_DID_NOTE; 673 return size; 674 } 675 676 core: 677 /* 678 * Sigh. The 2.0.36 kernel in Debian 2.1, at 679 * least, doesn't correctly implement name 680 * sections, in core dumps, as specified by 681 * the "Program Linking" section of "UNIX(R) System 682 * V Release 4 Programmer's Guide: ANSI C and 683 * Programming Support Tools", because my copy 684 * clearly says "The first 'namesz' bytes in 'name' 685 * contain a *null-terminated* [emphasis mine] 686 * character representation of the entry's owner 687 * or originator", but the 2.0.36 kernel code 688 * doesn't include the terminating null in the 689 * name.... 690 */ 691 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || 692 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { 693 os_style = OS_STYLE_SVR4; 694 } 695 696 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { 697 os_style = OS_STYLE_FREEBSD; 698 } 699 700 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) 701 == 0)) { 702 os_style = OS_STYLE_NETBSD; 703 } 704 705 #ifdef ELFCORE 706 if ((*flags & FLAGS_DID_CORE) != 0) 707 return size; 708 709 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 710 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 711 == -1) 712 return size; 713 *flags |= FLAGS_DID_CORE_STYLE; 714 } 715 716 switch (os_style) { 717 case OS_STYLE_NETBSD: 718 if (xnh_type == NT_NETBSD_CORE_PROCINFO) { 719 uint32_t signo; 720 /* 721 * Extract the program name. It is at 722 * offset 0x7c, and is up to 32-bytes, 723 * including the terminating NUL. 724 */ 725 if (file_printf(ms, ", from '%.31s'", 726 &nbuf[doff + 0x7c]) == -1) 727 return size; 728 729 /* 730 * Extract the signal number. It is at 731 * offset 0x08. 732 */ 733 (void)memcpy(&signo, &nbuf[doff + 0x08], 734 sizeof(signo)); 735 if (file_printf(ms, " (signal %u)", 736 elf_getu32(swap, signo)) == -1) 737 return size; 738 *flags |= FLAGS_DID_CORE; 739 return size; 740 } 741 break; 742 743 default: 744 if (xnh_type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 745 size_t i, j; 746 unsigned char c; 747 /* 748 * Extract the program name. We assume 749 * it to be 16 characters (that's what it 750 * is in SunOS 5.x and Linux). 751 * 752 * Unfortunately, it's at a different offset 753 * in various OSes, so try multiple offsets. 754 * If the characters aren't all printable, 755 * reject it. 756 */ 757 for (i = 0; i < NOFFSETS; i++) { 758 unsigned char *cname, *cp; 759 size_t reloffset = prpsoffsets(i); 760 size_t noffset = doff + reloffset; 761 size_t k; 762 for (j = 0; j < 16; j++, noffset++, 763 reloffset++) { 764 /* 765 * Make sure we're not past 766 * the end of the buffer; if 767 * we are, just give up. 768 */ 769 if (noffset >= size) 770 goto tryanother; 771 772 /* 773 * Make sure we're not past 774 * the end of the contents; 775 * if we are, this obviously 776 * isn't the right offset. 777 */ 778 if (reloffset >= descsz) 779 goto tryanother; 780 781 c = nbuf[noffset]; 782 if (c == '\0') { 783 /* 784 * A '\0' at the 785 * beginning is 786 * obviously wrong. 787 * Any other '\0' 788 * means we're done. 789 */ 790 if (j == 0) 791 goto tryanother; 792 else 793 break; 794 } else { 795 /* 796 * A nonprintable 797 * character is also 798 * wrong. 799 */ 800 if (!isprint(c) || isquote(c)) 801 goto tryanother; 802 } 803 } 804 /* 805 * Well, that worked. 806 */ 807 808 /* 809 * Try next offsets, in case this match is 810 * in the middle of a string. 811 */ 812 for (k = i + 1 ; k < NOFFSETS ; k++) { 813 size_t no; 814 int adjust = 1; 815 if (prpsoffsets(k) >= prpsoffsets(i)) 816 continue; 817 for (no = doff + prpsoffsets(k); 818 no < doff + prpsoffsets(i); no++) 819 adjust = adjust 820 && isprint(nbuf[no]); 821 if (adjust) 822 i = k; 823 } 824 825 cname = (unsigned char *) 826 &nbuf[doff + prpsoffsets(i)]; 827 for (cp = cname; *cp && isprint(*cp); cp++) 828 continue; 829 /* 830 * Linux apparently appends a space at the end 831 * of the command line: remove it. 832 */ 833 while (cp > cname && isspace(cp[-1])) 834 cp--; 835 if (file_printf(ms, ", from '%.*s'", 836 (int)(cp - cname), cname) == -1) 837 return size; 838 *flags |= FLAGS_DID_CORE; 839 return size; 840 841 tryanother: 842 ; 843 } 844 } 845 break; 846 } 847 #endif 848 return offset; 849 } 850 851 /* SunOS 5.x hardware capability descriptions */ 852 typedef struct cap_desc { 853 uint64_t cd_mask; 854 const char *cd_name; 855 } cap_desc_t; 856 857 static const cap_desc_t cap_desc_sparc[] = { 858 { AV_SPARC_MUL32, "MUL32" }, 859 { AV_SPARC_DIV32, "DIV32" }, 860 { AV_SPARC_FSMULD, "FSMULD" }, 861 { AV_SPARC_V8PLUS, "V8PLUS" }, 862 { AV_SPARC_POPC, "POPC" }, 863 { AV_SPARC_VIS, "VIS" }, 864 { AV_SPARC_VIS2, "VIS2" }, 865 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 866 { AV_SPARC_FMAF, "FMAF" }, 867 { AV_SPARC_FJFMAU, "FJFMAU" }, 868 { AV_SPARC_IMA, "IMA" }, 869 { 0, NULL } 870 }; 871 872 static const cap_desc_t cap_desc_386[] = { 873 { AV_386_FPU, "FPU" }, 874 { AV_386_TSC, "TSC" }, 875 { AV_386_CX8, "CX8" }, 876 { AV_386_SEP, "SEP" }, 877 { AV_386_AMD_SYSC, "AMD_SYSC" }, 878 { AV_386_CMOV, "CMOV" }, 879 { AV_386_MMX, "MMX" }, 880 { AV_386_AMD_MMX, "AMD_MMX" }, 881 { AV_386_AMD_3DNow, "AMD_3DNow" }, 882 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 883 { AV_386_FXSR, "FXSR" }, 884 { AV_386_SSE, "SSE" }, 885 { AV_386_SSE2, "SSE2" }, 886 { AV_386_PAUSE, "PAUSE" }, 887 { AV_386_SSE3, "SSE3" }, 888 { AV_386_MON, "MON" }, 889 { AV_386_CX16, "CX16" }, 890 { AV_386_AHF, "AHF" }, 891 { AV_386_TSCP, "TSCP" }, 892 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 893 { AV_386_POPCNT, "POPCNT" }, 894 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 895 { AV_386_SSSE3, "SSSE3" }, 896 { AV_386_SSE4_1, "SSE4.1" }, 897 { AV_386_SSE4_2, "SSE4.2" }, 898 { 0, NULL } 899 }; 900 901 private int 902 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 903 size_t size, off_t fsize, int *flags, int mach, int strtab) 904 { 905 Elf32_Shdr sh32; 906 Elf64_Shdr sh64; 907 int stripped = 1; 908 void *nbuf; 909 off_t noff, coff, name_off; 910 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */ 911 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */ 912 char name[50]; 913 914 if (size != xsh_sizeof) { 915 if (file_printf(ms, ", corrupted section header size") == -1) 916 return -1; 917 return 0; 918 } 919 920 /* Read offset of name section to be able to read section names later */ 921 if (pread(fd, xsh_addr, xsh_sizeof, off + size * strtab) == -1) { 922 file_badread(ms); 923 return -1; 924 } 925 name_off = xsh_offset; 926 927 for ( ; num; num--) { 928 /* Read the name of this section. */ 929 if (pread(fd, name, sizeof(name), name_off + xsh_name) == -1) { 930 file_badread(ms); 931 return -1; 932 } 933 name[sizeof(name) - 1] = '\0'; 934 if (strcmp(name, ".debug_info") == 0) 935 stripped = 0; 936 937 if (pread(fd, xsh_addr, xsh_sizeof, off) == -1) { 938 file_badread(ms); 939 return -1; 940 } 941 off += size; 942 943 /* Things we can determine before we seek */ 944 switch (xsh_type) { 945 case SHT_SYMTAB: 946 #if 0 947 case SHT_DYNSYM: 948 #endif 949 stripped = 0; 950 break; 951 default: 952 if (xsh_offset > fsize) { 953 /* Perhaps warn here */ 954 continue; 955 } 956 break; 957 } 958 959 /* Things we can determine when we seek */ 960 switch (xsh_type) { 961 case SHT_NOTE: 962 if ((nbuf = malloc(xsh_size)) == NULL) { 963 file_error(ms, errno, "Cannot allocate memory" 964 " for note"); 965 return -1; 966 } 967 if (pread(fd, nbuf, xsh_size, xsh_offset) == -1) { 968 file_badread(ms); 969 free(nbuf); 970 return -1; 971 } 972 973 noff = 0; 974 for (;;) { 975 if (noff >= (off_t)xsh_size) 976 break; 977 noff = donote(ms, nbuf, (size_t)noff, 978 xsh_size, clazz, swap, 4, flags); 979 if (noff == 0) 980 break; 981 } 982 free(nbuf); 983 break; 984 case SHT_SUNW_cap: 985 switch (mach) { 986 case EM_SPARC: 987 case EM_SPARCV9: 988 case EM_IA_64: 989 case EM_386: 990 case EM_AMD64: 991 break; 992 default: 993 goto skip; 994 } 995 996 if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) { 997 file_badseek(ms); 998 return -1; 999 } 1000 coff = 0; 1001 for (;;) { 1002 Elf32_Cap cap32; 1003 Elf64_Cap cap64; 1004 char cbuf[/*CONSTCOND*/ 1005 MAX(sizeof cap32, sizeof cap64)]; 1006 if ((coff += xcap_sizeof) > (off_t)xsh_size) 1007 break; 1008 if (read(fd, cbuf, (size_t)xcap_sizeof) != 1009 (ssize_t)xcap_sizeof) { 1010 file_badread(ms); 1011 return -1; 1012 } 1013 if (cbuf[0] == 'A') { 1014 #ifdef notyet 1015 char *p = cbuf + 1; 1016 uint32_t len, tag; 1017 memcpy(&len, p, sizeof(len)); 1018 p += 4; 1019 len = getu32(swap, len); 1020 if (memcmp("gnu", p, 3) != 0) { 1021 if (file_printf(ms, 1022 ", unknown capability %.3s", p) 1023 == -1) 1024 return -1; 1025 break; 1026 } 1027 p += strlen(p) + 1; 1028 tag = *p++; 1029 memcpy(&len, p, sizeof(len)); 1030 p += 4; 1031 len = getu32(swap, len); 1032 if (tag != 1) { 1033 if (file_printf(ms, ", unknown gnu" 1034 " capability tag %d", tag) 1035 == -1) 1036 return -1; 1037 break; 1038 } 1039 // gnu attributes 1040 #endif 1041 break; 1042 } 1043 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 1044 switch (xcap_tag) { 1045 case CA_SUNW_NULL: 1046 break; 1047 case CA_SUNW_HW_1: 1048 cap_hw1 |= xcap_val; 1049 break; 1050 case CA_SUNW_SF_1: 1051 cap_sf1 |= xcap_val; 1052 break; 1053 default: 1054 if (file_printf(ms, 1055 ", with unknown capability " 1056 "0x%" INT64_T_FORMAT "x = 0x%" 1057 INT64_T_FORMAT "x", 1058 (unsigned long long)xcap_tag, 1059 (unsigned long long)xcap_val) == -1) 1060 return -1; 1061 break; 1062 } 1063 } 1064 /*FALLTHROUGH*/ 1065 skip: 1066 default: 1067 break; 1068 } 1069 } 1070 1071 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1072 return -1; 1073 if (cap_hw1) { 1074 const cap_desc_t *cdp; 1075 switch (mach) { 1076 case EM_SPARC: 1077 case EM_SPARC32PLUS: 1078 case EM_SPARCV9: 1079 cdp = cap_desc_sparc; 1080 break; 1081 case EM_386: 1082 case EM_IA_64: 1083 case EM_AMD64: 1084 cdp = cap_desc_386; 1085 break; 1086 default: 1087 cdp = NULL; 1088 break; 1089 } 1090 if (file_printf(ms, ", uses") == -1) 1091 return -1; 1092 if (cdp) { 1093 while (cdp->cd_name) { 1094 if (cap_hw1 & cdp->cd_mask) { 1095 if (file_printf(ms, 1096 " %s", cdp->cd_name) == -1) 1097 return -1; 1098 cap_hw1 &= ~cdp->cd_mask; 1099 } 1100 ++cdp; 1101 } 1102 if (cap_hw1) 1103 if (file_printf(ms, 1104 " unknown hardware capability 0x%" 1105 INT64_T_FORMAT "x", 1106 (unsigned long long)cap_hw1) == -1) 1107 return -1; 1108 } else { 1109 if (file_printf(ms, 1110 " hardware capability 0x%" INT64_T_FORMAT "x", 1111 (unsigned long long)cap_hw1) == -1) 1112 return -1; 1113 } 1114 } 1115 if (cap_sf1) { 1116 if (cap_sf1 & SF1_SUNW_FPUSED) { 1117 if (file_printf(ms, 1118 (cap_sf1 & SF1_SUNW_FPKNWN) 1119 ? ", uses frame pointer" 1120 : ", not known to use frame pointer") == -1) 1121 return -1; 1122 } 1123 cap_sf1 &= ~SF1_SUNW_MASK; 1124 if (cap_sf1) 1125 if (file_printf(ms, 1126 ", with unknown software capability 0x%" 1127 INT64_T_FORMAT "x", 1128 (unsigned long long)cap_sf1) == -1) 1129 return -1; 1130 } 1131 return 0; 1132 } 1133 1134 /* 1135 * Look through the program headers of an executable image, searching 1136 * for a PT_INTERP section; if one is found, it's dynamically linked, 1137 * otherwise it's statically linked. 1138 */ 1139 private int 1140 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1141 int num, size_t size, off_t fsize, int *flags, int sh_num) 1142 { 1143 Elf32_Phdr ph32; 1144 Elf64_Phdr ph64; 1145 const char *linking_style = "statically"; 1146 const char *shared_libraries = ""; 1147 unsigned char nbuf[BUFSIZ]; 1148 ssize_t bufsize; 1149 size_t offset, align, len; 1150 1151 if (size != xph_sizeof) { 1152 if (file_printf(ms, ", corrupted program header size") == -1) 1153 return -1; 1154 return 0; 1155 } 1156 1157 for ( ; num; num--) { 1158 if (pread(fd, xph_addr, xph_sizeof, off) == -1) { 1159 file_badread(ms); 1160 return -1; 1161 } 1162 1163 off += size; 1164 1165 /* Things we can determine before we seek */ 1166 switch (xph_type) { 1167 case PT_DYNAMIC: 1168 linking_style = "dynamically"; 1169 break; 1170 case PT_INTERP: 1171 shared_libraries = " (uses shared libs)"; 1172 break; 1173 default: 1174 if (xph_offset > fsize) { 1175 /* Maybe warn here? */ 1176 continue; 1177 } 1178 break; 1179 } 1180 1181 /* Things we can determine when we seek */ 1182 switch (xph_type) { 1183 case PT_NOTE: 1184 if ((align = xph_align) & 0x80000000UL) { 1185 if (file_printf(ms, 1186 ", invalid note alignment 0x%lx", 1187 (unsigned long)align) == -1) 1188 return -1; 1189 align = 4; 1190 } 1191 if (sh_num) 1192 break; 1193 /* 1194 * This is a PT_NOTE section; loop through all the notes 1195 * in the section. 1196 */ 1197 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1198 : sizeof(nbuf); 1199 bufsize = pread(fd, nbuf, len, xph_offset); 1200 if (bufsize == -1) { 1201 file_badread(ms); 1202 return -1; 1203 } 1204 offset = 0; 1205 for (;;) { 1206 if (offset >= (size_t)bufsize) 1207 break; 1208 offset = donote(ms, nbuf, offset, 1209 (size_t)bufsize, clazz, swap, align, 1210 flags); 1211 if (offset == 0) 1212 break; 1213 } 1214 break; 1215 default: 1216 break; 1217 } 1218 } 1219 if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries) 1220 == -1) 1221 return -1; 1222 return 0; 1223 } 1224 1225 1226 protected int 1227 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, 1228 size_t nbytes) 1229 { 1230 union { 1231 int32_t l; 1232 char c[sizeof (int32_t)]; 1233 } u; 1234 int clazz; 1235 int swap; 1236 struct stat st; 1237 off_t fsize; 1238 int flags = 0; 1239 Elf32_Ehdr elf32hdr; 1240 Elf64_Ehdr elf64hdr; 1241 uint16_t type; 1242 1243 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) 1244 return 0; 1245 /* 1246 * ELF executables have multiple section headers in arbitrary 1247 * file locations and thus file(1) cannot determine it from easily. 1248 * Instead we traverse thru all section headers until a symbol table 1249 * one is found or else the binary is stripped. 1250 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1251 */ 1252 if (buf[EI_MAG0] != ELFMAG0 1253 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1254 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1255 return 0; 1256 1257 /* 1258 * If we cannot seek, it must be a pipe, socket or fifo. 1259 */ 1260 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1261 fd = file_pipe2file(ms, fd, buf, nbytes); 1262 1263 if (fstat(fd, &st) == -1) { 1264 file_badread(ms); 1265 return -1; 1266 } 1267 fsize = st.st_size; 1268 1269 clazz = buf[EI_CLASS]; 1270 1271 switch (clazz) { 1272 case ELFCLASS32: 1273 #undef elf_getu 1274 #define elf_getu(a, b) elf_getu32(a, b) 1275 #undef elfhdr 1276 #define elfhdr elf32hdr 1277 #include "elfclass.h" 1278 case ELFCLASS64: 1279 #undef elf_getu 1280 #define elf_getu(a, b) elf_getu64(a, b) 1281 #undef elfhdr 1282 #define elfhdr elf64hdr 1283 #include "elfclass.h" 1284 default: 1285 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1286 return -1; 1287 break; 1288 } 1289 return 0; 1290 } 1291 #endif 1292