readelf.c revision 298920
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 30FILE_RCSID("@(#)$File: readelf.c,v 1.127 2015/11/18 12:29:29 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 45private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t, 46 off_t, int *, uint16_t *); 47#endif 48private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t, 49 off_t, int, int *, uint16_t *); 50private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, 51 off_t, int, int, int *, uint16_t *); 52private size_t donote(struct magic_set *, void *, size_t, size_t, int, 53 int, size_t, int *, uint16_t *, int, off_t, int, off_t); 54 55#define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) 56 57#define isquote(c) (strchr("'\"`", (c)) != NULL) 58 59private uint16_t getu16(int, uint16_t); 60private uint32_t getu32(int, uint32_t); 61private 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 67private int 68toomany(struct magic_set *ms, const char *name, uint16_t num) 69{ 70 if (file_printf(ms, ", too many %s (%u)", name, num 71 ) == -1) 72 return -1; 73 return 0; 74} 75 76private uint16_t 77getu16(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 95private uint32_t 96getu32(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 116private uint64_t 117getu64(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_vaddr (size_t)((clazz == ELFCLASS32 \ 181 ? (off_t) (ph32.p_vaddr ? \ 182 elf_getu32(swap, ph32.p_vaddr) : 4) \ 183 : (off_t) (ph64.p_vaddr ? \ 184 elf_getu64(swap, ph64.p_vaddr) : 4))) 185#define xph_filesz (size_t)((clazz == ELFCLASS32 \ 186 ? elf_getu32(swap, ph32.p_filesz) \ 187 : elf_getu64(swap, ph64.p_filesz))) 188#define xnh_addr (clazz == ELFCLASS32 \ 189 ? (void *)&nh32 \ 190 : (void *)&nh64) 191#define xph_memsz (size_t)((clazz == ELFCLASS32 \ 192 ? elf_getu32(swap, ph32.p_memsz) \ 193 : elf_getu64(swap, ph64.p_memsz))) 194#define xnh_sizeof (clazz == ELFCLASS32 \ 195 ? sizeof(nh32) \ 196 : sizeof(nh64)) 197#define xnh_type (clazz == ELFCLASS32 \ 198 ? elf_getu32(swap, nh32.n_type) \ 199 : elf_getu32(swap, nh64.n_type)) 200#define xnh_namesz (clazz == ELFCLASS32 \ 201 ? elf_getu32(swap, nh32.n_namesz) \ 202 : elf_getu32(swap, nh64.n_namesz)) 203#define xnh_descsz (clazz == ELFCLASS32 \ 204 ? elf_getu32(swap, nh32.n_descsz) \ 205 : elf_getu32(swap, nh64.n_descsz)) 206#define prpsoffsets(i) (clazz == ELFCLASS32 \ 207 ? prpsoffsets32[i] \ 208 : prpsoffsets64[i]) 209#define xcap_addr (clazz == ELFCLASS32 \ 210 ? (void *)&cap32 \ 211 : (void *)&cap64) 212#define xcap_sizeof (clazz == ELFCLASS32 \ 213 ? sizeof cap32 \ 214 : sizeof cap64) 215#define xcap_tag (clazz == ELFCLASS32 \ 216 ? elf_getu32(swap, cap32.c_tag) \ 217 : elf_getu64(swap, cap64.c_tag)) 218#define xcap_val (clazz == ELFCLASS32 \ 219 ? elf_getu32(swap, cap32.c_un.c_val) \ 220 : elf_getu64(swap, cap64.c_un.c_val)) 221#define xauxv_addr (clazz == ELFCLASS32 \ 222 ? (void *)&auxv32 \ 223 : (void *)&auxv64) 224#define xauxv_sizeof (clazz == ELFCLASS32 \ 225 ? sizeof(auxv32) \ 226 : sizeof(auxv64)) 227#define xauxv_type (clazz == ELFCLASS32 \ 228 ? elf_getu32(swap, auxv32.a_type) \ 229 : elf_getu64(swap, auxv64.a_type)) 230#define xauxv_val (clazz == ELFCLASS32 \ 231 ? elf_getu32(swap, auxv32.a_v) \ 232 : elf_getu64(swap, auxv64.a_v)) 233 234#ifdef ELFCORE 235/* 236 * Try larger offsets first to avoid false matches 237 * from earlier data that happen to look like strings. 238 */ 239static const size_t prpsoffsets32[] = { 240#ifdef USE_NT_PSINFO 241 104, /* SunOS 5.x (command line) */ 242 88, /* SunOS 5.x (short name) */ 243#endif /* USE_NT_PSINFO */ 244 245 100, /* SunOS 5.x (command line) */ 246 84, /* SunOS 5.x (short name) */ 247 248 44, /* Linux (command line) */ 249 28, /* Linux 2.0.36 (short name) */ 250 251 8, /* FreeBSD */ 252}; 253 254static const size_t prpsoffsets64[] = { 255#ifdef USE_NT_PSINFO 256 152, /* SunOS 5.x (command line) */ 257 136, /* SunOS 5.x (short name) */ 258#endif /* USE_NT_PSINFO */ 259 260 136, /* SunOS 5.x, 64-bit (command line) */ 261 120, /* SunOS 5.x, 64-bit (short name) */ 262 263 56, /* Linux (command line) */ 264 40, /* Linux (tested on core from 2.4.x, short name) */ 265 266 16, /* FreeBSD, 64-bit */ 267}; 268 269#define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0]) 270#define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0]) 271 272#define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 273 274/* 275 * Look through the program headers of an executable image, searching 276 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 277 * "FreeBSD"; if one is found, try looking in various places in its 278 * contents for a 16-character string containing only printable 279 * characters - if found, that string should be the name of the program 280 * that dropped core. Note: right after that 16-character string is, 281 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 282 * Linux, a longer string (80 characters, in 5.x, probably other 283 * SVR4-flavored systems, and Linux) containing the start of the 284 * command line for that program. 285 * 286 * SunOS 5.x core files contain two PT_NOTE sections, with the types 287 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 288 * same info about the command name and command line, so it probably 289 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 290 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 291 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 292 * the SunOS 5.x file command relies on this (and prefers the latter). 293 * 294 * The signal number probably appears in a section of type NT_PRSTATUS, 295 * but that's also rather OS-dependent, in ways that are harder to 296 * dissect with heuristics, so I'm not bothering with the signal number. 297 * (I suppose the signal number could be of interest in situations where 298 * you don't have the binary of the program that dropped core; if you 299 * *do* have that binary, the debugger will probably tell you what 300 * signal it was.) 301 */ 302 303#define OS_STYLE_SVR4 0 304#define OS_STYLE_FREEBSD 1 305#define OS_STYLE_NETBSD 2 306 307private const char os_style_names[][8] = { 308 "SVR4", 309 "FreeBSD", 310 "NetBSD", 311}; 312 313#define FLAGS_DID_CORE 0x001 314#define FLAGS_DID_OS_NOTE 0x002 315#define FLAGS_DID_BUILD_ID 0x004 316#define FLAGS_DID_CORE_STYLE 0x008 317#define FLAGS_DID_NETBSD_PAX 0x010 318#define FLAGS_DID_NETBSD_MARCH 0x020 319#define FLAGS_DID_NETBSD_CMODEL 0x040 320#define FLAGS_DID_NETBSD_UNKNOWN 0x080 321#define FLAGS_IS_CORE 0x100 322#define FLAGS_DID_AUXV 0x200 323 324private int 325dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 326 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 327{ 328 Elf32_Phdr ph32; 329 Elf64_Phdr ph64; 330 size_t offset, len; 331 unsigned char nbuf[BUFSIZ]; 332 ssize_t bufsize; 333 off_t ph_off = off; 334 int ph_num = num; 335 336 if (size != xph_sizeof) { 337 if (file_printf(ms, ", corrupted program header size") == -1) 338 return -1; 339 return 0; 340 } 341 342 /* 343 * Loop through all the program headers. 344 */ 345 for ( ; num; num--) { 346 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 347 file_badread(ms); 348 return -1; 349 } 350 off += size; 351 352 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 353 /* Perhaps warn here */ 354 continue; 355 } 356 357 if (xph_type != PT_NOTE) 358 continue; 359 360 /* 361 * This is a PT_NOTE section; loop through all the notes 362 * in the section. 363 */ 364 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 365 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) { 366 file_badread(ms); 367 return -1; 368 } 369 offset = 0; 370 for (;;) { 371 if (offset >= (size_t)bufsize) 372 break; 373 offset = donote(ms, nbuf, offset, (size_t)bufsize, 374 clazz, swap, 4, flags, notecount, fd, ph_off, 375 ph_num, fsize); 376 if (offset == 0) 377 break; 378 379 } 380 } 381 return 0; 382} 383#endif 384 385static void 386do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 387{ 388 uint32_t desc; 389 (void)memcpy(&desc, v, sizeof(desc)); 390 desc = elf_getu32(swap, desc); 391 392 if (file_printf(ms, ", for NetBSD") == -1) 393 return; 394 /* 395 * The version number used to be stuck as 199905, and was thus 396 * basically content-free. Newer versions of NetBSD have fixed 397 * this and now use the encoding of __NetBSD_Version__: 398 * 399 * MMmmrrpp00 400 * 401 * M = major version 402 * m = minor version 403 * r = release ["",A-Z,Z[A-Z] but numeric] 404 * p = patchlevel 405 */ 406 if (desc > 100000000U) { 407 uint32_t ver_patch = (desc / 100) % 100; 408 uint32_t ver_rel = (desc / 10000) % 100; 409 uint32_t ver_min = (desc / 1000000) % 100; 410 uint32_t ver_maj = desc / 100000000; 411 412 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 413 return; 414 if (ver_rel == 0 && ver_patch != 0) { 415 if (file_printf(ms, ".%u", ver_patch) == -1) 416 return; 417 } else if (ver_rel != 0) { 418 while (ver_rel > 26) { 419 if (file_printf(ms, "Z") == -1) 420 return; 421 ver_rel -= 26; 422 } 423 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 424 == -1) 425 return; 426 } 427 } 428} 429 430static void 431do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 432{ 433 uint32_t desc; 434 435 (void)memcpy(&desc, v, sizeof(desc)); 436 desc = elf_getu32(swap, desc); 437 if (file_printf(ms, ", for FreeBSD") == -1) 438 return; 439 440 /* 441 * Contents is __FreeBSD_version, whose relation to OS 442 * versions is defined by a huge table in the Porter's 443 * Handbook. This is the general scheme: 444 * 445 * Releases: 446 * Mmp000 (before 4.10) 447 * Mmi0p0 (before 5.0) 448 * Mmm0p0 449 * 450 * Development branches: 451 * Mmpxxx (before 4.6) 452 * Mmp1xx (before 4.10) 453 * Mmi1xx (before 5.0) 454 * M000xx (pre-M.0) 455 * Mmm1xx 456 * 457 * M = major version 458 * m = minor version 459 * i = minor version increment (491000 -> 4.10) 460 * p = patchlevel 461 * x = revision 462 * 463 * The first release of FreeBSD to use ELF by default 464 * was version 3.0. 465 */ 466 if (desc == 460002) { 467 if (file_printf(ms, " 4.6.2") == -1) 468 return; 469 } else if (desc < 460100) { 470 if (file_printf(ms, " %d.%d", desc / 100000, 471 desc / 10000 % 10) == -1) 472 return; 473 if (desc / 1000 % 10 > 0) 474 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 475 return; 476 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 477 if (file_printf(ms, " (%d)", desc) == -1) 478 return; 479 } else if (desc < 500000) { 480 if (file_printf(ms, " %d.%d", desc / 100000, 481 desc / 10000 % 10 + desc / 1000 % 10) == -1) 482 return; 483 if (desc / 100 % 10 > 0) { 484 if (file_printf(ms, " (%d)", desc) == -1) 485 return; 486 } else if (desc / 10 % 10 > 0) { 487 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 488 return; 489 } 490 } else { 491 if (file_printf(ms, " %d.%d", desc / 100000, 492 desc / 1000 % 100) == -1) 493 return; 494 if ((desc / 100 % 10 > 0) || 495 (desc % 100000 / 100 == 0)) { 496 if (file_printf(ms, " (%d)", desc) == -1) 497 return; 498 } else if (desc / 10 % 10 > 0) { 499 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 500 return; 501 } 502 } 503} 504 505private int 506/*ARGSUSED*/ 507do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 508 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 509 size_t noff, size_t doff, int *flags) 510{ 511 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 512 type == NT_GNU_BUILD_ID && (descsz == 16 || descsz == 20)) { 513 uint8_t desc[20]; 514 uint32_t i; 515 *flags |= FLAGS_DID_BUILD_ID; 516 if (file_printf(ms, ", BuildID[%s]=", descsz == 16 ? "md5/uuid" : 517 "sha1") == -1) 518 return 1; 519 (void)memcpy(desc, &nbuf[doff], descsz); 520 for (i = 0; i < descsz; i++) 521 if (file_printf(ms, "%02x", desc[i]) == -1) 522 return 1; 523 return 1; 524 } 525 return 0; 526} 527 528private int 529do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 530 int swap, uint32_t namesz, uint32_t descsz, 531 size_t noff, size_t doff, int *flags) 532{ 533 if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 && 534 type == NT_GNU_VERSION && descsz == 2) { 535 *flags |= FLAGS_DID_OS_NOTE; 536 file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]); 537 return 1; 538 } 539 540 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 541 type == NT_GNU_VERSION && descsz == 16) { 542 uint32_t desc[4]; 543 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 544 545 *flags |= FLAGS_DID_OS_NOTE; 546 if (file_printf(ms, ", for GNU/") == -1) 547 return 1; 548 switch (elf_getu32(swap, desc[0])) { 549 case GNU_OS_LINUX: 550 if (file_printf(ms, "Linux") == -1) 551 return 1; 552 break; 553 case GNU_OS_HURD: 554 if (file_printf(ms, "Hurd") == -1) 555 return 1; 556 break; 557 case GNU_OS_SOLARIS: 558 if (file_printf(ms, "Solaris") == -1) 559 return 1; 560 break; 561 case GNU_OS_KFREEBSD: 562 if (file_printf(ms, "kFreeBSD") == -1) 563 return 1; 564 break; 565 case GNU_OS_KNETBSD: 566 if (file_printf(ms, "kNetBSD") == -1) 567 return 1; 568 break; 569 default: 570 if (file_printf(ms, "<unknown>") == -1) 571 return 1; 572 } 573 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 574 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 575 return 1; 576 return 1; 577 } 578 579 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 580 if (type == NT_NETBSD_VERSION && descsz == 4) { 581 *flags |= FLAGS_DID_OS_NOTE; 582 do_note_netbsd_version(ms, swap, &nbuf[doff]); 583 return 1; 584 } 585 } 586 587 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) { 588 if (type == NT_FREEBSD_VERSION && descsz == 4) { 589 *flags |= FLAGS_DID_OS_NOTE; 590 do_note_freebsd_version(ms, swap, &nbuf[doff]); 591 return 1; 592 } 593 } 594 595 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && 596 type == NT_OPENBSD_VERSION && descsz == 4) { 597 *flags |= FLAGS_DID_OS_NOTE; 598 if (file_printf(ms, ", for OpenBSD") == -1) 599 return 1; 600 /* Content of note is always 0 */ 601 return 1; 602 } 603 604 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && 605 type == NT_DRAGONFLY_VERSION && descsz == 4) { 606 uint32_t desc; 607 *flags |= FLAGS_DID_OS_NOTE; 608 if (file_printf(ms, ", for DragonFly") == -1) 609 return 1; 610 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 611 desc = elf_getu32(swap, desc); 612 if (file_printf(ms, " %d.%d.%d", desc / 100000, 613 desc / 10000 % 10, desc % 10000) == -1) 614 return 1; 615 return 1; 616 } 617 return 0; 618} 619 620private int 621do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 622 int swap, uint32_t namesz, uint32_t descsz, 623 size_t noff, size_t doff, int *flags) 624{ 625 if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 && 626 type == NT_NETBSD_PAX && descsz == 4) { 627 static const char *pax[] = { 628 "+mprotect", 629 "-mprotect", 630 "+segvguard", 631 "-segvguard", 632 "+ASLR", 633 "-ASLR", 634 }; 635 uint32_t desc; 636 size_t i; 637 int did = 0; 638 639 *flags |= FLAGS_DID_NETBSD_PAX; 640 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 641 desc = elf_getu32(swap, desc); 642 643 if (desc && file_printf(ms, ", PaX: ") == -1) 644 return 1; 645 646 for (i = 0; i < __arraycount(pax); i++) { 647 if (((1 << (int)i) & desc) == 0) 648 continue; 649 if (file_printf(ms, "%s%s", did++ ? "," : "", 650 pax[i]) == -1) 651 return 1; 652 } 653 return 1; 654 } 655 return 0; 656} 657 658private int 659do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 660 int swap, uint32_t namesz, uint32_t descsz, 661 size_t noff, size_t doff, int *flags, size_t size, int clazz) 662{ 663#ifdef ELFCORE 664 int os_style = -1; 665 /* 666 * Sigh. The 2.0.36 kernel in Debian 2.1, at 667 * least, doesn't correctly implement name 668 * sections, in core dumps, as specified by 669 * the "Program Linking" section of "UNIX(R) System 670 * V Release 4 Programmer's Guide: ANSI C and 671 * Programming Support Tools", because my copy 672 * clearly says "The first 'namesz' bytes in 'name' 673 * contain a *null-terminated* [emphasis mine] 674 * character representation of the entry's owner 675 * or originator", but the 2.0.36 kernel code 676 * doesn't include the terminating null in the 677 * name.... 678 */ 679 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || 680 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { 681 os_style = OS_STYLE_SVR4; 682 } 683 684 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { 685 os_style = OS_STYLE_FREEBSD; 686 } 687 688 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) 689 == 0)) { 690 os_style = OS_STYLE_NETBSD; 691 } 692 693 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 694 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 695 == -1) 696 return 1; 697 *flags |= FLAGS_DID_CORE_STYLE; 698 } 699 700 switch (os_style) { 701 case OS_STYLE_NETBSD: 702 if (type == NT_NETBSD_CORE_PROCINFO) { 703 char sbuf[512]; 704 uint32_t signo; 705 /* 706 * Extract the program name. It is at 707 * offset 0x7c, and is up to 32-bytes, 708 * including the terminating NUL. 709 */ 710 if (file_printf(ms, ", from '%.31s'", 711 file_printable(sbuf, sizeof(sbuf), 712 (const char *)&nbuf[doff + 0x7c])) == -1) 713 return 1; 714 715 /* 716 * Extract the signal number. It is at 717 * offset 0x08. 718 */ 719 (void)memcpy(&signo, &nbuf[doff + 0x08], 720 sizeof(signo)); 721 if (file_printf(ms, " (signal %u)", 722 elf_getu32(swap, signo)) == -1) 723 return 1; 724 *flags |= FLAGS_DID_CORE; 725 return 1; 726 } 727 break; 728 729 default: 730 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 731 size_t i, j; 732 unsigned char c; 733 /* 734 * Extract the program name. We assume 735 * it to be 16 characters (that's what it 736 * is in SunOS 5.x and Linux). 737 * 738 * Unfortunately, it's at a different offset 739 * in various OSes, so try multiple offsets. 740 * If the characters aren't all printable, 741 * reject it. 742 */ 743 for (i = 0; i < NOFFSETS; i++) { 744 unsigned char *cname, *cp; 745 size_t reloffset = prpsoffsets(i); 746 size_t noffset = doff + reloffset; 747 size_t k; 748 for (j = 0; j < 16; j++, noffset++, 749 reloffset++) { 750 /* 751 * Make sure we're not past 752 * the end of the buffer; if 753 * we are, just give up. 754 */ 755 if (noffset >= size) 756 goto tryanother; 757 758 /* 759 * Make sure we're not past 760 * the end of the contents; 761 * if we are, this obviously 762 * isn't the right offset. 763 */ 764 if (reloffset >= descsz) 765 goto tryanother; 766 767 c = nbuf[noffset]; 768 if (c == '\0') { 769 /* 770 * A '\0' at the 771 * beginning is 772 * obviously wrong. 773 * Any other '\0' 774 * means we're done. 775 */ 776 if (j == 0) 777 goto tryanother; 778 else 779 break; 780 } else { 781 /* 782 * A nonprintable 783 * character is also 784 * wrong. 785 */ 786 if (!isprint(c) || isquote(c)) 787 goto tryanother; 788 } 789 } 790 /* 791 * Well, that worked. 792 */ 793 794 /* 795 * Try next offsets, in case this match is 796 * in the middle of a string. 797 */ 798 for (k = i + 1 ; k < NOFFSETS; k++) { 799 size_t no; 800 int adjust = 1; 801 if (prpsoffsets(k) >= prpsoffsets(i)) 802 continue; 803 for (no = doff + prpsoffsets(k); 804 no < doff + prpsoffsets(i); no++) 805 adjust = adjust 806 && isprint(nbuf[no]); 807 if (adjust) 808 i = k; 809 } 810 811 cname = (unsigned char *) 812 &nbuf[doff + prpsoffsets(i)]; 813 for (cp = cname; *cp && isprint(*cp); cp++) 814 continue; 815 /* 816 * Linux apparently appends a space at the end 817 * of the command line: remove it. 818 */ 819 while (cp > cname && isspace(cp[-1])) 820 cp--; 821 if (file_printf(ms, ", from '%.*s'", 822 (int)(cp - cname), cname) == -1) 823 return 1; 824 *flags |= FLAGS_DID_CORE; 825 return 1; 826 827 tryanother: 828 ; 829 } 830 } 831 break; 832 } 833#endif 834 return 0; 835} 836 837private off_t 838get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, 839 off_t off, int num, off_t fsize, uint64_t virtaddr) 840{ 841 Elf32_Phdr ph32; 842 Elf64_Phdr ph64; 843 844 /* 845 * Loop through all the program headers and find the header with 846 * virtual address in which the "virtaddr" belongs to. 847 */ 848 for ( ; num; num--) { 849 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 850 file_badread(ms); 851 return -1; 852 } 853 off += xph_sizeof; 854 855 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 856 /* Perhaps warn here */ 857 continue; 858 } 859 860 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) 861 return xph_offset + (virtaddr - xph_vaddr); 862 } 863 return 0; 864} 865 866private size_t 867get_string_on_virtaddr(struct magic_set *ms, 868 int swap, int clazz, int fd, off_t ph_off, int ph_num, 869 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) 870{ 871 char *bptr; 872 off_t offset; 873 874 if (buflen == 0) 875 return 0; 876 877 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, 878 fsize, virtaddr); 879 if ((buflen = pread(fd, buf, buflen, offset)) <= 0) { 880 file_badread(ms); 881 return 0; 882 } 883 884 buf[buflen - 1] = '\0'; 885 886 /* We expect only printable characters, so return if buffer contains 887 * non-printable character before the '\0' or just '\0'. */ 888 for (bptr = buf; *bptr && isprint((unsigned char)*bptr); bptr++) 889 continue; 890 if (*bptr != '\0') 891 return 0; 892 893 return bptr - buf; 894} 895 896 897private int 898do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 899 int swap, uint32_t namesz __attribute__((__unused__)), 900 uint32_t descsz __attribute__((__unused__)), 901 size_t noff __attribute__((__unused__)), size_t doff, 902 int *flags, size_t size __attribute__((__unused__)), int clazz, 903 int fd, off_t ph_off, int ph_num, off_t fsize) 904{ 905#ifdef ELFCORE 906 Aux32Info auxv32; 907 Aux64Info auxv64; 908 size_t elsize = xauxv_sizeof; 909 const char *tag; 910 int is_string; 911 size_t nval; 912 913 if (type != NT_AUXV || (*flags & FLAGS_IS_CORE) == 0) 914 return 0; 915 916 *flags |= FLAGS_DID_AUXV; 917 918 nval = 0; 919 for (size_t off = 0; off + elsize <= descsz; off += elsize) { 920 (void)memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 921 /* Limit processing to 50 vector entries to prevent DoS */ 922 if (nval++ >= 50) { 923 file_error(ms, 0, "Too many ELF Auxv elements"); 924 return 1; 925 } 926 927 switch(xauxv_type) { 928 case AT_LINUX_EXECFN: 929 is_string = 1; 930 tag = "execfn"; 931 break; 932 case AT_LINUX_PLATFORM: 933 is_string = 1; 934 tag = "platform"; 935 break; 936 case AT_LINUX_UID: 937 is_string = 0; 938 tag = "real uid"; 939 break; 940 case AT_LINUX_GID: 941 is_string = 0; 942 tag = "real gid"; 943 break; 944 case AT_LINUX_EUID: 945 is_string = 0; 946 tag = "effective uid"; 947 break; 948 case AT_LINUX_EGID: 949 is_string = 0; 950 tag = "effective gid"; 951 break; 952 default: 953 is_string = 0; 954 tag = NULL; 955 break; 956 } 957 958 if (tag == NULL) 959 continue; 960 961 if (is_string) { 962 char buf[256]; 963 ssize_t buflen; 964 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 965 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 966 967 if (buflen == 0) 968 continue; 969 970 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 971 return 0; 972 } else { 973 if (file_printf(ms, ", %s: %d", tag, (int) xauxv_val) 974 == -1) 975 return 0; 976 } 977 } 978 return 1; 979#else 980 return 0; 981#endif 982} 983 984private size_t 985donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 986 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 987 int fd, off_t ph_off, int ph_num, off_t fsize) 988{ 989 Elf32_Nhdr nh32; 990 Elf64_Nhdr nh64; 991 size_t noff, doff; 992 uint32_t namesz, descsz; 993 unsigned char *nbuf = CAST(unsigned char *, vbuf); 994 995 if (*notecount == 0) 996 return 0; 997 --*notecount; 998 999 if (xnh_sizeof + offset > size) { 1000 /* 1001 * We're out of note headers. 1002 */ 1003 return xnh_sizeof + offset; 1004 } 1005 1006 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1007 offset += xnh_sizeof; 1008 1009 namesz = xnh_namesz; 1010 descsz = xnh_descsz; 1011 1012 if ((namesz == 0) && (descsz == 0)) { 1013 /* 1014 * We're out of note headers. 1015 */ 1016 return (offset >= size) ? offset : size; 1017 } 1018 1019 if (namesz & 0x80000000) { 1020 (void)file_printf(ms, ", bad note name size 0x%lx", 1021 (unsigned long)namesz); 1022 return 0; 1023 } 1024 1025 if (descsz & 0x80000000) { 1026 (void)file_printf(ms, ", bad note description size 0x%lx", 1027 (unsigned long)descsz); 1028 return 0; 1029 } 1030 1031 noff = offset; 1032 doff = ELF_ALIGN(offset + namesz); 1033 1034 if (offset + namesz > size) { 1035 /* 1036 * We're past the end of the buffer. 1037 */ 1038 return doff; 1039 } 1040 1041 offset = ELF_ALIGN(doff + descsz); 1042 if (doff + descsz > size) { 1043 /* 1044 * We're past the end of the buffer. 1045 */ 1046 return (offset >= size) ? offset : size; 1047 } 1048 1049 1050 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1051 if (do_os_note(ms, nbuf, xnh_type, swap, 1052 namesz, descsz, noff, doff, flags)) 1053 return offset; 1054 } 1055 1056 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1057 if (do_bid_note(ms, nbuf, xnh_type, swap, 1058 namesz, descsz, noff, doff, flags)) 1059 return offset; 1060 } 1061 1062 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1063 if (do_pax_note(ms, nbuf, xnh_type, swap, 1064 namesz, descsz, noff, doff, flags)) 1065 return offset; 1066 } 1067 1068 if ((*flags & FLAGS_DID_CORE) == 0) { 1069 if (do_core_note(ms, nbuf, xnh_type, swap, 1070 namesz, descsz, noff, doff, flags, size, clazz)) 1071 return offset; 1072 } 1073 1074 if ((*flags & FLAGS_DID_AUXV) == 0) { 1075 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1076 namesz, descsz, noff, doff, flags, size, clazz, 1077 fd, ph_off, ph_num, fsize)) 1078 return offset; 1079 } 1080 1081 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 1082 if (descsz > 100) 1083 descsz = 100; 1084 switch (xnh_type) { 1085 case NT_NETBSD_VERSION: 1086 return offset; 1087 case NT_NETBSD_MARCH: 1088 if (*flags & FLAGS_DID_NETBSD_MARCH) 1089 return offset; 1090 *flags |= FLAGS_DID_NETBSD_MARCH; 1091 if (file_printf(ms, ", compiled for: %.*s", 1092 (int)descsz, (const char *)&nbuf[doff]) == -1) 1093 return offset; 1094 break; 1095 case NT_NETBSD_CMODEL: 1096 if (*flags & FLAGS_DID_NETBSD_CMODEL) 1097 return offset; 1098 *flags |= FLAGS_DID_NETBSD_CMODEL; 1099 if (file_printf(ms, ", compiler model: %.*s", 1100 (int)descsz, (const char *)&nbuf[doff]) == -1) 1101 return offset; 1102 break; 1103 default: 1104 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1105 return offset; 1106 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1107 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1108 return offset; 1109 break; 1110 } 1111 return offset; 1112 } 1113 1114 return offset; 1115} 1116 1117/* SunOS 5.x hardware capability descriptions */ 1118typedef struct cap_desc { 1119 uint64_t cd_mask; 1120 const char *cd_name; 1121} cap_desc_t; 1122 1123static const cap_desc_t cap_desc_sparc[] = { 1124 { AV_SPARC_MUL32, "MUL32" }, 1125 { AV_SPARC_DIV32, "DIV32" }, 1126 { AV_SPARC_FSMULD, "FSMULD" }, 1127 { AV_SPARC_V8PLUS, "V8PLUS" }, 1128 { AV_SPARC_POPC, "POPC" }, 1129 { AV_SPARC_VIS, "VIS" }, 1130 { AV_SPARC_VIS2, "VIS2" }, 1131 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1132 { AV_SPARC_FMAF, "FMAF" }, 1133 { AV_SPARC_FJFMAU, "FJFMAU" }, 1134 { AV_SPARC_IMA, "IMA" }, 1135 { 0, NULL } 1136}; 1137 1138static const cap_desc_t cap_desc_386[] = { 1139 { AV_386_FPU, "FPU" }, 1140 { AV_386_TSC, "TSC" }, 1141 { AV_386_CX8, "CX8" }, 1142 { AV_386_SEP, "SEP" }, 1143 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1144 { AV_386_CMOV, "CMOV" }, 1145 { AV_386_MMX, "MMX" }, 1146 { AV_386_AMD_MMX, "AMD_MMX" }, 1147 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1148 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1149 { AV_386_FXSR, "FXSR" }, 1150 { AV_386_SSE, "SSE" }, 1151 { AV_386_SSE2, "SSE2" }, 1152 { AV_386_PAUSE, "PAUSE" }, 1153 { AV_386_SSE3, "SSE3" }, 1154 { AV_386_MON, "MON" }, 1155 { AV_386_CX16, "CX16" }, 1156 { AV_386_AHF, "AHF" }, 1157 { AV_386_TSCP, "TSCP" }, 1158 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1159 { AV_386_POPCNT, "POPCNT" }, 1160 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1161 { AV_386_SSSE3, "SSSE3" }, 1162 { AV_386_SSE4_1, "SSE4.1" }, 1163 { AV_386_SSE4_2, "SSE4.2" }, 1164 { 0, NULL } 1165}; 1166 1167private int 1168doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1169 size_t size, off_t fsize, int mach, int strtab, int *flags, 1170 uint16_t *notecount) 1171{ 1172 Elf32_Shdr sh32; 1173 Elf64_Shdr sh64; 1174 int stripped = 1; 1175 size_t nbadcap = 0; 1176 void *nbuf; 1177 off_t noff, coff, name_off; 1178 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */ 1179 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */ 1180 char name[50]; 1181 ssize_t namesize; 1182 1183 if (size != xsh_sizeof) { 1184 if (file_printf(ms, ", corrupted section header size") == -1) 1185 return -1; 1186 return 0; 1187 } 1188 1189 /* Read offset of name section to be able to read section names later */ 1190 if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab))) 1191 < (ssize_t)xsh_sizeof) { 1192 file_badread(ms); 1193 return -1; 1194 } 1195 name_off = xsh_offset; 1196 1197 for ( ; num; num--) { 1198 /* Read the name of this section. */ 1199 if ((namesize = pread(fd, name, sizeof(name) - 1, name_off + xsh_name)) == -1) { 1200 file_badread(ms); 1201 return -1; 1202 } 1203 name[namesize] = '\0'; 1204 if (strcmp(name, ".debug_info") == 0) 1205 stripped = 0; 1206 1207 if (pread(fd, xsh_addr, xsh_sizeof, off) < (ssize_t)xsh_sizeof) { 1208 file_badread(ms); 1209 return -1; 1210 } 1211 off += size; 1212 1213 /* Things we can determine before we seek */ 1214 switch (xsh_type) { 1215 case SHT_SYMTAB: 1216#if 0 1217 case SHT_DYNSYM: 1218#endif 1219 stripped = 0; 1220 break; 1221 default: 1222 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1223 /* Perhaps warn here */ 1224 continue; 1225 } 1226 break; 1227 } 1228 1229 1230 /* Things we can determine when we seek */ 1231 switch (xsh_type) { 1232 case SHT_NOTE: 1233 if ((uintmax_t)(xsh_size + xsh_offset) > 1234 (uintmax_t)fsize) { 1235 if (file_printf(ms, 1236 ", note offset/size 0x%" INTMAX_T_FORMAT 1237 "x+0x%" INTMAX_T_FORMAT "x exceeds" 1238 " file size 0x%" INTMAX_T_FORMAT "x", 1239 (uintmax_t)xsh_offset, (uintmax_t)xsh_size, 1240 (uintmax_t)fsize) == -1) 1241 return -1; 1242 return 0; 1243 } 1244 if ((nbuf = malloc(xsh_size)) == NULL) { 1245 file_error(ms, errno, "Cannot allocate memory" 1246 " for note"); 1247 return -1; 1248 } 1249 if (pread(fd, nbuf, xsh_size, xsh_offset) < 1250 (ssize_t)xsh_size) { 1251 file_badread(ms); 1252 free(nbuf); 1253 return -1; 1254 } 1255 1256 noff = 0; 1257 for (;;) { 1258 if (noff >= (off_t)xsh_size) 1259 break; 1260 noff = donote(ms, nbuf, (size_t)noff, 1261 xsh_size, clazz, swap, 4, flags, notecount, 1262 fd, 0, 0, 0); 1263 if (noff == 0) 1264 break; 1265 } 1266 free(nbuf); 1267 break; 1268 case SHT_SUNW_cap: 1269 switch (mach) { 1270 case EM_SPARC: 1271 case EM_SPARCV9: 1272 case EM_IA_64: 1273 case EM_386: 1274 case EM_AMD64: 1275 break; 1276 default: 1277 goto skip; 1278 } 1279 1280 if (nbadcap > 5) 1281 break; 1282 if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) { 1283 file_badseek(ms); 1284 return -1; 1285 } 1286 coff = 0; 1287 for (;;) { 1288 Elf32_Cap cap32; 1289 Elf64_Cap cap64; 1290 char cbuf[/*CONSTCOND*/ 1291 MAX(sizeof cap32, sizeof cap64)]; 1292 if ((coff += xcap_sizeof) > (off_t)xsh_size) 1293 break; 1294 if (read(fd, cbuf, (size_t)xcap_sizeof) != 1295 (ssize_t)xcap_sizeof) { 1296 file_badread(ms); 1297 return -1; 1298 } 1299 if (cbuf[0] == 'A') { 1300#ifdef notyet 1301 char *p = cbuf + 1; 1302 uint32_t len, tag; 1303 memcpy(&len, p, sizeof(len)); 1304 p += 4; 1305 len = getu32(swap, len); 1306 if (memcmp("gnu", p, 3) != 0) { 1307 if (file_printf(ms, 1308 ", unknown capability %.3s", p) 1309 == -1) 1310 return -1; 1311 break; 1312 } 1313 p += strlen(p) + 1; 1314 tag = *p++; 1315 memcpy(&len, p, sizeof(len)); 1316 p += 4; 1317 len = getu32(swap, len); 1318 if (tag != 1) { 1319 if (file_printf(ms, ", unknown gnu" 1320 " capability tag %d", tag) 1321 == -1) 1322 return -1; 1323 break; 1324 } 1325 // gnu attributes 1326#endif 1327 break; 1328 } 1329 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 1330 switch (xcap_tag) { 1331 case CA_SUNW_NULL: 1332 break; 1333 case CA_SUNW_HW_1: 1334 cap_hw1 |= xcap_val; 1335 break; 1336 case CA_SUNW_SF_1: 1337 cap_sf1 |= xcap_val; 1338 break; 1339 default: 1340 if (file_printf(ms, 1341 ", with unknown capability " 1342 "0x%" INT64_T_FORMAT "x = 0x%" 1343 INT64_T_FORMAT "x", 1344 (unsigned long long)xcap_tag, 1345 (unsigned long long)xcap_val) == -1) 1346 return -1; 1347 if (nbadcap++ > 2) 1348 coff = xsh_size; 1349 break; 1350 } 1351 } 1352 /*FALLTHROUGH*/ 1353 skip: 1354 default: 1355 break; 1356 } 1357 } 1358 1359 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1360 return -1; 1361 if (cap_hw1) { 1362 const cap_desc_t *cdp; 1363 switch (mach) { 1364 case EM_SPARC: 1365 case EM_SPARC32PLUS: 1366 case EM_SPARCV9: 1367 cdp = cap_desc_sparc; 1368 break; 1369 case EM_386: 1370 case EM_IA_64: 1371 case EM_AMD64: 1372 cdp = cap_desc_386; 1373 break; 1374 default: 1375 cdp = NULL; 1376 break; 1377 } 1378 if (file_printf(ms, ", uses") == -1) 1379 return -1; 1380 if (cdp) { 1381 while (cdp->cd_name) { 1382 if (cap_hw1 & cdp->cd_mask) { 1383 if (file_printf(ms, 1384 " %s", cdp->cd_name) == -1) 1385 return -1; 1386 cap_hw1 &= ~cdp->cd_mask; 1387 } 1388 ++cdp; 1389 } 1390 if (cap_hw1) 1391 if (file_printf(ms, 1392 " unknown hardware capability 0x%" 1393 INT64_T_FORMAT "x", 1394 (unsigned long long)cap_hw1) == -1) 1395 return -1; 1396 } else { 1397 if (file_printf(ms, 1398 " hardware capability 0x%" INT64_T_FORMAT "x", 1399 (unsigned long long)cap_hw1) == -1) 1400 return -1; 1401 } 1402 } 1403 if (cap_sf1) { 1404 if (cap_sf1 & SF1_SUNW_FPUSED) { 1405 if (file_printf(ms, 1406 (cap_sf1 & SF1_SUNW_FPKNWN) 1407 ? ", uses frame pointer" 1408 : ", not known to use frame pointer") == -1) 1409 return -1; 1410 } 1411 cap_sf1 &= ~SF1_SUNW_MASK; 1412 if (cap_sf1) 1413 if (file_printf(ms, 1414 ", with unknown software capability 0x%" 1415 INT64_T_FORMAT "x", 1416 (unsigned long long)cap_sf1) == -1) 1417 return -1; 1418 } 1419 return 0; 1420} 1421 1422/* 1423 * Look through the program headers of an executable image, searching 1424 * for a PT_INTERP section; if one is found, it's dynamically linked, 1425 * otherwise it's statically linked. 1426 */ 1427private int 1428dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1429 int num, size_t size, off_t fsize, int sh_num, int *flags, 1430 uint16_t *notecount) 1431{ 1432 Elf32_Phdr ph32; 1433 Elf64_Phdr ph64; 1434 const char *linking_style = "statically"; 1435 const char *interp = ""; 1436 unsigned char nbuf[BUFSIZ]; 1437 char ibuf[BUFSIZ]; 1438 ssize_t bufsize; 1439 size_t offset, align, len; 1440 1441 if (size != xph_sizeof) { 1442 if (file_printf(ms, ", corrupted program header size") == -1) 1443 return -1; 1444 return 0; 1445 } 1446 1447 for ( ; num; num--) { 1448 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 1449 file_badread(ms); 1450 return -1; 1451 } 1452 1453 off += size; 1454 bufsize = 0; 1455 align = 4; 1456 1457 /* Things we can determine before we seek */ 1458 switch (xph_type) { 1459 case PT_DYNAMIC: 1460 linking_style = "dynamically"; 1461 break; 1462 case PT_NOTE: 1463 if (sh_num) /* Did this through section headers */ 1464 continue; 1465 if (((align = xph_align) & 0x80000000UL) != 0 || 1466 align < 4) { 1467 if (file_printf(ms, 1468 ", invalid note alignment 0x%lx", 1469 (unsigned long)align) == -1) 1470 return -1; 1471 align = 4; 1472 } 1473 /*FALLTHROUGH*/ 1474 case PT_INTERP: 1475 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1476 : sizeof(nbuf); 1477 bufsize = pread(fd, nbuf, len, xph_offset); 1478 if (bufsize == -1) { 1479 file_badread(ms); 1480 return -1; 1481 } 1482 break; 1483 default: 1484 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1485 /* Maybe warn here? */ 1486 continue; 1487 } 1488 break; 1489 } 1490 1491 /* Things we can determine when we seek */ 1492 switch (xph_type) { 1493 case PT_INTERP: 1494 if (bufsize && nbuf[0]) { 1495 nbuf[bufsize - 1] = '\0'; 1496 interp = (const char *)nbuf; 1497 } else 1498 interp = "*empty*"; 1499 break; 1500 case PT_NOTE: 1501 /* 1502 * This is a PT_NOTE section; loop through all the notes 1503 * in the section. 1504 */ 1505 offset = 0; 1506 for (;;) { 1507 if (offset >= (size_t)bufsize) 1508 break; 1509 offset = donote(ms, nbuf, offset, 1510 (size_t)bufsize, clazz, swap, align, 1511 flags, notecount, fd, 0, 0, 0); 1512 if (offset == 0) 1513 break; 1514 } 1515 break; 1516 default: 1517 break; 1518 } 1519 } 1520 if (file_printf(ms, ", %s linked", linking_style) 1521 == -1) 1522 return -1; 1523 if (interp[0]) 1524 if (file_printf(ms, ", interpreter %s", 1525 file_printable(ibuf, sizeof(ibuf), interp)) == -1) 1526 return -1; 1527 return 0; 1528} 1529 1530 1531protected int 1532file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, 1533 size_t nbytes) 1534{ 1535 union { 1536 int32_t l; 1537 char c[sizeof (int32_t)]; 1538 } u; 1539 int clazz; 1540 int swap; 1541 struct stat st; 1542 off_t fsize; 1543 int flags = 0; 1544 Elf32_Ehdr elf32hdr; 1545 Elf64_Ehdr elf64hdr; 1546 uint16_t type, phnum, shnum, notecount; 1547 1548 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION)) 1549 return 0; 1550 /* 1551 * ELF executables have multiple section headers in arbitrary 1552 * file locations and thus file(1) cannot determine it from easily. 1553 * Instead we traverse thru all section headers until a symbol table 1554 * one is found or else the binary is stripped. 1555 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1556 */ 1557 if (buf[EI_MAG0] != ELFMAG0 1558 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1559 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1560 return 0; 1561 1562 /* 1563 * If we cannot seek, it must be a pipe, socket or fifo. 1564 */ 1565 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1566 fd = file_pipe2file(ms, fd, buf, nbytes); 1567 1568 if (fstat(fd, &st) == -1) { 1569 file_badread(ms); 1570 return -1; 1571 } 1572 if (S_ISREG(st.st_mode) || st.st_size != 0) 1573 fsize = st.st_size; 1574 else 1575 fsize = SIZE_UNKNOWN; 1576 1577 clazz = buf[EI_CLASS]; 1578 1579 switch (clazz) { 1580 case ELFCLASS32: 1581#undef elf_getu 1582#define elf_getu(a, b) elf_getu32(a, b) 1583#undef elfhdr 1584#define elfhdr elf32hdr 1585#include "elfclass.h" 1586 case ELFCLASS64: 1587#undef elf_getu 1588#define elf_getu(a, b) elf_getu64(a, b) 1589#undef elfhdr 1590#define elfhdr elf64hdr 1591#include "elfclass.h" 1592 default: 1593 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1594 return -1; 1595 break; 1596 } 1597 return 0; 1598} 1599#endif 1600