1 /* $NetBSD: readelf.c,v 1.16 2017/09/08 13:40:25 christos Exp $ */ 2 3 /* 4 * Copyright (c) Christos Zoulas 2003. 5 * All Rights Reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice immediately at the beginning of the file, without modification, 12 * this list of conditions, and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 #include "file.h" 30 31 #ifndef lint 32 #if 0 33 FILE_RCSID("@(#)$File: readelf.c,v 1.138 2017/08/27 07:55:02 christos Exp $") 34 #else 35 __RCSID("$NetBSD: readelf.c,v 1.16 2017/09/08 13:40:25 christos Exp $"); 36 #endif 37 #endif 38 39 #ifdef BUILTIN_ELF 40 #include <string.h> 41 #include <ctype.h> 42 #include <stdlib.h> 43 #ifdef HAVE_UNISTD_H 44 #include <unistd.h> 45 #endif 46 47 #include "readelf.h" 48 #include "magic.h" 49 50 #ifdef ELFCORE 51 private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t, 52 off_t, int *, uint16_t *); 53 #endif 54 private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t, 55 off_t, int, int *, uint16_t *); 56 private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, 57 off_t, int, int, int *, uint16_t *); 58 private size_t donote(struct magic_set *, void *, size_t, size_t, int, 59 int, size_t, int *, uint16_t *, int, off_t, int, off_t); 60 61 #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) 62 63 #define isquote(c) (strchr("'\"`", (c)) != NULL) 64 65 private uint16_t getu16(int, uint16_t); 66 private uint32_t getu32(int, uint32_t); 67 private uint64_t getu64(int, uint64_t); 68 69 #define MAX_PHNUM 128 70 #define MAX_SHNUM 32768 71 #define SIZE_UNKNOWN ((off_t)-1) 72 73 private int 74 toomany(struct magic_set *ms, const char *name, uint16_t num) 75 { 76 if (file_printf(ms, ", too many %s (%u)", name, num 77 ) == -1) 78 return -1; 79 return 0; 80 } 81 82 private uint16_t 83 getu16(int swap, uint16_t value) 84 { 85 union { 86 uint16_t ui; 87 char c[2]; 88 } retval, tmpval; 89 90 if (swap) { 91 tmpval.ui = value; 92 93 retval.c[0] = tmpval.c[1]; 94 retval.c[1] = tmpval.c[0]; 95 96 return retval.ui; 97 } else 98 return value; 99 } 100 101 private uint32_t 102 getu32(int swap, uint32_t value) 103 { 104 union { 105 uint32_t ui; 106 char c[4]; 107 } retval, tmpval; 108 109 if (swap) { 110 tmpval.ui = value; 111 112 retval.c[0] = tmpval.c[3]; 113 retval.c[1] = tmpval.c[2]; 114 retval.c[2] = tmpval.c[1]; 115 retval.c[3] = tmpval.c[0]; 116 117 return retval.ui; 118 } else 119 return value; 120 } 121 122 private uint64_t 123 getu64(int swap, uint64_t value) 124 { 125 union { 126 uint64_t ui; 127 char c[8]; 128 } retval, tmpval; 129 130 if (swap) { 131 tmpval.ui = value; 132 133 retval.c[0] = tmpval.c[7]; 134 retval.c[1] = tmpval.c[6]; 135 retval.c[2] = tmpval.c[5]; 136 retval.c[3] = tmpval.c[4]; 137 retval.c[4] = tmpval.c[3]; 138 retval.c[5] = tmpval.c[2]; 139 retval.c[6] = tmpval.c[1]; 140 retval.c[7] = tmpval.c[0]; 141 142 return retval.ui; 143 } else 144 return value; 145 } 146 147 #define elf_getu16(swap, value) getu16(swap, value) 148 #define elf_getu32(swap, value) getu32(swap, value) 149 #define elf_getu64(swap, value) getu64(swap, value) 150 151 #define xsh_addr (clazz == ELFCLASS32 \ 152 ? (void *)&sh32 \ 153 : (void *)&sh64) 154 #define xsh_sizeof (clazz == ELFCLASS32 \ 155 ? sizeof(sh32) \ 156 : sizeof(sh64)) 157 #define xsh_size (size_t)(clazz == ELFCLASS32 \ 158 ? elf_getu32(swap, sh32.sh_size) \ 159 : elf_getu64(swap, sh64.sh_size)) 160 #define xsh_offset (off_t)(clazz == ELFCLASS32 \ 161 ? elf_getu32(swap, sh32.sh_offset) \ 162 : elf_getu64(swap, sh64.sh_offset)) 163 #define xsh_type (clazz == ELFCLASS32 \ 164 ? elf_getu32(swap, sh32.sh_type) \ 165 : elf_getu32(swap, sh64.sh_type)) 166 #define xsh_name (clazz == ELFCLASS32 \ 167 ? elf_getu32(swap, sh32.sh_name) \ 168 : elf_getu32(swap, sh64.sh_name)) 169 #define xph_addr (clazz == ELFCLASS32 \ 170 ? (void *) &ph32 \ 171 : (void *) &ph64) 172 #define xph_sizeof (clazz == ELFCLASS32 \ 173 ? sizeof(ph32) \ 174 : sizeof(ph64)) 175 #define xph_type (clazz == ELFCLASS32 \ 176 ? elf_getu32(swap, ph32.p_type) \ 177 : elf_getu32(swap, ph64.p_type)) 178 #define xph_offset (off_t)(clazz == ELFCLASS32 \ 179 ? elf_getu32(swap, ph32.p_offset) \ 180 : elf_getu64(swap, ph64.p_offset)) 181 #define xph_align (size_t)((clazz == ELFCLASS32 \ 182 ? (off_t) (ph32.p_align ? \ 183 elf_getu32(swap, ph32.p_align) : 4) \ 184 : (off_t) (ph64.p_align ? \ 185 elf_getu64(swap, ph64.p_align) : 4))) 186 #define xph_vaddr (size_t)((clazz == ELFCLASS32 \ 187 ? (off_t) (ph32.p_vaddr ? \ 188 elf_getu32(swap, ph32.p_vaddr) : 4) \ 189 : (off_t) (ph64.p_vaddr ? \ 190 elf_getu64(swap, ph64.p_vaddr) : 4))) 191 #define xph_filesz (size_t)((clazz == ELFCLASS32 \ 192 ? elf_getu32(swap, ph32.p_filesz) \ 193 : elf_getu64(swap, ph64.p_filesz))) 194 #define xnh_addr (clazz == ELFCLASS32 \ 195 ? (void *)&nh32 \ 196 : (void *)&nh64) 197 #define xph_memsz (size_t)((clazz == ELFCLASS32 \ 198 ? elf_getu32(swap, ph32.p_memsz) \ 199 : elf_getu64(swap, ph64.p_memsz))) 200 #define xnh_sizeof (clazz == ELFCLASS32 \ 201 ? sizeof(nh32) \ 202 : sizeof(nh64)) 203 #define xnh_type (clazz == ELFCLASS32 \ 204 ? elf_getu32(swap, nh32.n_type) \ 205 : elf_getu32(swap, nh64.n_type)) 206 #define xnh_namesz (clazz == ELFCLASS32 \ 207 ? elf_getu32(swap, nh32.n_namesz) \ 208 : elf_getu32(swap, nh64.n_namesz)) 209 #define xnh_descsz (clazz == ELFCLASS32 \ 210 ? elf_getu32(swap, nh32.n_descsz) \ 211 : elf_getu32(swap, nh64.n_descsz)) 212 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 213 ? prpsoffsets32[i] \ 214 : prpsoffsets64[i]) 215 #define xcap_addr (clazz == ELFCLASS32 \ 216 ? (void *)&cap32 \ 217 : (void *)&cap64) 218 #define xcap_sizeof (clazz == ELFCLASS32 \ 219 ? sizeof cap32 \ 220 : sizeof cap64) 221 #define xcap_tag (clazz == ELFCLASS32 \ 222 ? elf_getu32(swap, cap32.c_tag) \ 223 : elf_getu64(swap, cap64.c_tag)) 224 #define xcap_val (clazz == ELFCLASS32 \ 225 ? elf_getu32(swap, cap32.c_un.c_val) \ 226 : elf_getu64(swap, cap64.c_un.c_val)) 227 #define xauxv_addr (clazz == ELFCLASS32 \ 228 ? (void *)&auxv32 \ 229 : (void *)&auxv64) 230 #define xauxv_sizeof (clazz == ELFCLASS32 \ 231 ? sizeof(auxv32) \ 232 : sizeof(auxv64)) 233 #define xauxv_type (clazz == ELFCLASS32 \ 234 ? elf_getu32(swap, auxv32.a_type) \ 235 : elf_getu64(swap, auxv64.a_type)) 236 #define xauxv_val (clazz == ELFCLASS32 \ 237 ? elf_getu32(swap, auxv32.a_v) \ 238 : elf_getu64(swap, auxv64.a_v)) 239 240 #ifdef ELFCORE 241 /* 242 * Try larger offsets first to avoid false matches 243 * from earlier data that happen to look like strings. 244 */ 245 static const size_t prpsoffsets32[] = { 246 #ifdef USE_NT_PSINFO 247 104, /* SunOS 5.x (command line) */ 248 88, /* SunOS 5.x (short name) */ 249 #endif /* USE_NT_PSINFO */ 250 251 100, /* SunOS 5.x (command line) */ 252 84, /* SunOS 5.x (short name) */ 253 254 44, /* Linux (command line) */ 255 28, /* Linux 2.0.36 (short name) */ 256 257 8, /* FreeBSD */ 258 }; 259 260 static const size_t prpsoffsets64[] = { 261 #ifdef USE_NT_PSINFO 262 152, /* SunOS 5.x (command line) */ 263 136, /* SunOS 5.x (short name) */ 264 #endif /* USE_NT_PSINFO */ 265 266 136, /* SunOS 5.x, 64-bit (command line) */ 267 120, /* SunOS 5.x, 64-bit (short name) */ 268 269 56, /* Linux (command line) */ 270 40, /* Linux (tested on core from 2.4.x, short name) */ 271 272 16, /* FreeBSD, 64-bit */ 273 }; 274 275 #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0]) 276 #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0]) 277 278 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 279 280 /* 281 * Look through the program headers of an executable image, searching 282 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 283 * "FreeBSD"; if one is found, try looking in various places in its 284 * contents for a 16-character string containing only printable 285 * characters - if found, that string should be the name of the program 286 * that dropped core. Note: right after that 16-character string is, 287 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 288 * Linux, a longer string (80 characters, in 5.x, probably other 289 * SVR4-flavored systems, and Linux) containing the start of the 290 * command line for that program. 291 * 292 * SunOS 5.x core files contain two PT_NOTE sections, with the types 293 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 294 * same info about the command name and command line, so it probably 295 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 296 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 297 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 298 * the SunOS 5.x file command relies on this (and prefers the latter). 299 * 300 * The signal number probably appears in a section of type NT_PRSTATUS, 301 * but that's also rather OS-dependent, in ways that are harder to 302 * dissect with heuristics, so I'm not bothering with the signal number. 303 * (I suppose the signal number could be of interest in situations where 304 * you don't have the binary of the program that dropped core; if you 305 * *do* have that binary, the debugger will probably tell you what 306 * signal it was.) 307 */ 308 309 #define OS_STYLE_SVR4 0 310 #define OS_STYLE_FREEBSD 1 311 #define OS_STYLE_NETBSD 2 312 313 private const char os_style_names[][8] = { 314 "SVR4", 315 "FreeBSD", 316 "NetBSD", 317 }; 318 319 #define FLAGS_CORE_STYLE 0x003 320 321 #define FLAGS_DID_CORE 0x004 322 #define FLAGS_DID_OS_NOTE 0x008 323 #define FLAGS_DID_BUILD_ID 0x010 324 #define FLAGS_DID_CORE_STYLE 0x020 325 #define FLAGS_DID_NETBSD_PAX 0x040 326 #define FLAGS_DID_NETBSD_MARCH 0x080 327 #define FLAGS_DID_NETBSD_CMODEL 0x100 328 #define FLAGS_DID_NETBSD_UNKNOWN 0x200 329 #define FLAGS_IS_CORE 0x400 330 #define FLAGS_DID_AUXV 0x800 331 332 private int 333 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 334 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 335 { 336 Elf32_Phdr ph32; 337 Elf64_Phdr ph64; 338 size_t offset, len; 339 unsigned char nbuf[BUFSIZ]; 340 ssize_t bufsize; 341 off_t ph_off = off; 342 int ph_num = num; 343 344 if (size != xph_sizeof) { 345 if (file_printf(ms, ", corrupted program header size") == -1) 346 return -1; 347 return 0; 348 } 349 350 /* 351 * Loop through all the program headers. 352 */ 353 for ( ; num; num--) { 354 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 355 file_badread(ms); 356 return -1; 357 } 358 off += size; 359 360 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 361 /* Perhaps warn here */ 362 continue; 363 } 364 365 if (xph_type != PT_NOTE) 366 continue; 367 368 /* 369 * This is a PT_NOTE section; loop through all the notes 370 * in the section. 371 */ 372 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 373 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) { 374 file_badread(ms); 375 return -1; 376 } 377 offset = 0; 378 for (;;) { 379 if (offset >= (size_t)bufsize) 380 break; 381 offset = donote(ms, nbuf, offset, (size_t)bufsize, 382 clazz, swap, 4, flags, notecount, fd, ph_off, 383 ph_num, fsize); 384 if (offset == 0) 385 break; 386 387 } 388 } 389 return 0; 390 } 391 #endif 392 393 static void 394 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 395 { 396 uint32_t desc; 397 (void)memcpy(&desc, v, sizeof(desc)); 398 desc = elf_getu32(swap, desc); 399 400 if (file_printf(ms, ", for NetBSD") == -1) 401 return; 402 /* 403 * The version number used to be stuck as 199905, and was thus 404 * basically content-free. Newer versions of NetBSD have fixed 405 * this and now use the encoding of __NetBSD_Version__: 406 * 407 * MMmmrrpp00 408 * 409 * M = major version 410 * m = minor version 411 * r = release ["",A-Z,Z[A-Z] but numeric] 412 * p = patchlevel 413 */ 414 if (desc > 100000000U) { 415 uint32_t ver_patch = (desc / 100) % 100; 416 uint32_t ver_rel = (desc / 10000) % 100; 417 uint32_t ver_min = (desc / 1000000) % 100; 418 uint32_t ver_maj = desc / 100000000; 419 420 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 421 return; 422 if (ver_rel == 0 && ver_patch != 0) { 423 if (file_printf(ms, ".%u", ver_patch) == -1) 424 return; 425 } else if (ver_rel != 0) { 426 while (ver_rel > 26) { 427 if (file_printf(ms, "Z") == -1) 428 return; 429 ver_rel -= 26; 430 } 431 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 432 == -1) 433 return; 434 } 435 } 436 } 437 438 static void 439 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 440 { 441 uint32_t desc; 442 443 (void)memcpy(&desc, v, sizeof(desc)); 444 desc = elf_getu32(swap, desc); 445 if (file_printf(ms, ", for FreeBSD") == -1) 446 return; 447 448 /* 449 * Contents is __FreeBSD_version, whose relation to OS 450 * versions is defined by a huge table in the Porter's 451 * Handbook. This is the general scheme: 452 * 453 * Releases: 454 * Mmp000 (before 4.10) 455 * Mmi0p0 (before 5.0) 456 * Mmm0p0 457 * 458 * Development branches: 459 * Mmpxxx (before 4.6) 460 * Mmp1xx (before 4.10) 461 * Mmi1xx (before 5.0) 462 * M000xx (pre-M.0) 463 * Mmm1xx 464 * 465 * M = major version 466 * m = minor version 467 * i = minor version increment (491000 -> 4.10) 468 * p = patchlevel 469 * x = revision 470 * 471 * The first release of FreeBSD to use ELF by default 472 * was version 3.0. 473 */ 474 if (desc == 460002) { 475 if (file_printf(ms, " 4.6.2") == -1) 476 return; 477 } else if (desc < 460100) { 478 if (file_printf(ms, " %d.%d", desc / 100000, 479 desc / 10000 % 10) == -1) 480 return; 481 if (desc / 1000 % 10 > 0) 482 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 483 return; 484 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 485 if (file_printf(ms, " (%d)", desc) == -1) 486 return; 487 } else if (desc < 500000) { 488 if (file_printf(ms, " %d.%d", desc / 100000, 489 desc / 10000 % 10 + desc / 1000 % 10) == -1) 490 return; 491 if (desc / 100 % 10 > 0) { 492 if (file_printf(ms, " (%d)", desc) == -1) 493 return; 494 } else if (desc / 10 % 10 > 0) { 495 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 496 return; 497 } 498 } else { 499 if (file_printf(ms, " %d.%d", desc / 100000, 500 desc / 1000 % 100) == -1) 501 return; 502 if ((desc / 100 % 10 > 0) || 503 (desc % 100000 / 100 == 0)) { 504 if (file_printf(ms, " (%d)", desc) == -1) 505 return; 506 } else if (desc / 10 % 10 > 0) { 507 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 508 return; 509 } 510 } 511 } 512 513 private int 514 /*ARGSUSED*/ 515 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 516 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 517 size_t noff, size_t doff, int *flags) 518 { 519 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 520 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) { 521 uint8_t desc[20]; 522 const char *btype; 523 uint32_t i; 524 *flags |= FLAGS_DID_BUILD_ID; 525 switch (descsz) { 526 case 8: 527 btype = "xxHash"; 528 break; 529 case 16: 530 btype = "md5/uuid"; 531 break; 532 case 20: 533 btype = "sha1"; 534 break; 535 default: 536 btype = "unknown"; 537 break; 538 } 539 if (file_printf(ms, ", BuildID[%s]=", btype) == -1) 540 return 1; 541 (void)memcpy(desc, &nbuf[doff], descsz); 542 for (i = 0; i < descsz; i++) 543 if (file_printf(ms, "%02x", desc[i]) == -1) 544 return 1; 545 return 1; 546 } 547 return 0; 548 } 549 550 private int 551 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 552 int swap, uint32_t namesz, uint32_t descsz, 553 size_t noff, size_t doff, int *flags) 554 { 555 if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 && 556 type == NT_GNU_VERSION && descsz == 2) { 557 *flags |= FLAGS_DID_OS_NOTE; 558 file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]); 559 return 1; 560 } 561 562 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 563 type == NT_GNU_VERSION && descsz == 16) { 564 uint32_t desc[4]; 565 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 566 567 *flags |= FLAGS_DID_OS_NOTE; 568 if (file_printf(ms, ", for GNU/") == -1) 569 return 1; 570 switch (elf_getu32(swap, desc[0])) { 571 case GNU_OS_LINUX: 572 if (file_printf(ms, "Linux") == -1) 573 return 1; 574 break; 575 case GNU_OS_HURD: 576 if (file_printf(ms, "Hurd") == -1) 577 return 1; 578 break; 579 case GNU_OS_SOLARIS: 580 if (file_printf(ms, "Solaris") == -1) 581 return 1; 582 break; 583 case GNU_OS_KFREEBSD: 584 if (file_printf(ms, "kFreeBSD") == -1) 585 return 1; 586 break; 587 case GNU_OS_KNETBSD: 588 if (file_printf(ms, "kNetBSD") == -1) 589 return 1; 590 break; 591 default: 592 if (file_printf(ms, "<unknown>") == -1) 593 return 1; 594 } 595 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 596 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 597 return 1; 598 return 1; 599 } 600 601 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 602 if (type == NT_NETBSD_VERSION && descsz == 4) { 603 *flags |= FLAGS_DID_OS_NOTE; 604 do_note_netbsd_version(ms, swap, &nbuf[doff]); 605 return 1; 606 } 607 } 608 609 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) { 610 if (type == NT_FREEBSD_VERSION && descsz == 4) { 611 *flags |= FLAGS_DID_OS_NOTE; 612 do_note_freebsd_version(ms, swap, &nbuf[doff]); 613 return 1; 614 } 615 } 616 617 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && 618 type == NT_OPENBSD_VERSION && descsz == 4) { 619 *flags |= FLAGS_DID_OS_NOTE; 620 if (file_printf(ms, ", for OpenBSD") == -1) 621 return 1; 622 /* Content of note is always 0 */ 623 return 1; 624 } 625 626 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && 627 type == NT_DRAGONFLY_VERSION && descsz == 4) { 628 uint32_t desc; 629 *flags |= FLAGS_DID_OS_NOTE; 630 if (file_printf(ms, ", for DragonFly") == -1) 631 return 1; 632 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 633 desc = elf_getu32(swap, desc); 634 if (file_printf(ms, " %d.%d.%d", desc / 100000, 635 desc / 10000 % 10, desc % 10000) == -1) 636 return 1; 637 return 1; 638 } 639 return 0; 640 } 641 642 private int 643 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 644 int swap, uint32_t namesz, uint32_t descsz, 645 size_t noff, size_t doff, int *flags) 646 { 647 if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 && 648 type == NT_NETBSD_PAX && descsz == 4) { 649 static const char *pax[] = { 650 "+mprotect", 651 "-mprotect", 652 "+segvguard", 653 "-segvguard", 654 "+ASLR", 655 "-ASLR", 656 }; 657 uint32_t desc; 658 size_t i; 659 int did = 0; 660 661 *flags |= FLAGS_DID_NETBSD_PAX; 662 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 663 desc = elf_getu32(swap, desc); 664 665 if (desc && file_printf(ms, ", PaX: ") == -1) 666 return 1; 667 668 for (i = 0; i < __arraycount(pax); i++) { 669 if (((1 << (int)i) & desc) == 0) 670 continue; 671 if (file_printf(ms, "%s%s", did++ ? "," : "", 672 pax[i]) == -1) 673 return 1; 674 } 675 return 1; 676 } 677 return 0; 678 } 679 680 private int 681 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 682 int swap, uint32_t namesz, uint32_t descsz, 683 size_t noff, size_t doff, int *flags, size_t size, int clazz) 684 { 685 #ifdef ELFCORE 686 int os_style = -1; 687 /* 688 * Sigh. The 2.0.36 kernel in Debian 2.1, at 689 * least, doesn't correctly implement name 690 * sections, in core dumps, as specified by 691 * the "Program Linking" section of "UNIX(R) System 692 * V Release 4 Programmer's Guide: ANSI C and 693 * Programming Support Tools", because my copy 694 * clearly says "The first 'namesz' bytes in 'name' 695 * contain a *null-terminated* [emphasis mine] 696 * character representation of the entry's owner 697 * or originator", but the 2.0.36 kernel code 698 * doesn't include the terminating null in the 699 * name.... 700 */ 701 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || 702 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { 703 os_style = OS_STYLE_SVR4; 704 } 705 706 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { 707 os_style = OS_STYLE_FREEBSD; 708 } 709 710 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) 711 == 0)) { 712 os_style = OS_STYLE_NETBSD; 713 } 714 715 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 716 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 717 == -1) 718 return 1; 719 *flags |= FLAGS_DID_CORE_STYLE; 720 *flags |= os_style; 721 } 722 723 switch (os_style) { 724 case OS_STYLE_NETBSD: 725 if (type == NT_NETBSD_CORE_PROCINFO) { 726 char sbuf[512]; 727 struct NetBSD_elfcore_procinfo pi; 728 memset(&pi, 0, sizeof(pi)); 729 memcpy(&pi, nbuf + doff, descsz); 730 731 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, " 732 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)", 733 file_printable(sbuf, sizeof(sbuf), 734 CAST(char *, pi.cpi_name)), 735 elf_getu32(swap, (uint32_t)pi.cpi_pid), 736 elf_getu32(swap, pi.cpi_euid), 737 elf_getu32(swap, pi.cpi_egid), 738 elf_getu32(swap, pi.cpi_nlwps), 739 elf_getu32(swap, (uint32_t)pi.cpi_siglwp), 740 elf_getu32(swap, pi.cpi_signo), 741 elf_getu32(swap, pi.cpi_sigcode)) == -1) 742 return 1; 743 744 *flags |= FLAGS_DID_CORE; 745 return 1; 746 } 747 break; 748 749 default: 750 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 751 size_t i, j; 752 unsigned char c; 753 /* 754 * Extract the program name. We assume 755 * it to be 16 characters (that's what it 756 * is in SunOS 5.x and Linux). 757 * 758 * Unfortunately, it's at a different offset 759 * in various OSes, so try multiple offsets. 760 * If the characters aren't all printable, 761 * reject it. 762 */ 763 for (i = 0; i < NOFFSETS; i++) { 764 unsigned char *cname, *cp; 765 size_t reloffset = prpsoffsets(i); 766 size_t noffset = doff + reloffset; 767 size_t k; 768 for (j = 0; j < 16; j++, noffset++, 769 reloffset++) { 770 /* 771 * Make sure we're not past 772 * the end of the buffer; if 773 * we are, just give up. 774 */ 775 if (noffset >= size) 776 goto tryanother; 777 778 /* 779 * Make sure we're not past 780 * the end of the contents; 781 * if we are, this obviously 782 * isn't the right offset. 783 */ 784 if (reloffset >= descsz) 785 goto tryanother; 786 787 c = nbuf[noffset]; 788 if (c == '\0') { 789 /* 790 * A '\0' at the 791 * beginning is 792 * obviously wrong. 793 * Any other '\0' 794 * means we're done. 795 */ 796 if (j == 0) 797 goto tryanother; 798 else 799 break; 800 } else { 801 /* 802 * A nonprintable 803 * character is also 804 * wrong. 805 */ 806 if (!isprint(c) || isquote(c)) 807 goto tryanother; 808 } 809 } 810 /* 811 * Well, that worked. 812 */ 813 814 /* 815 * Try next offsets, in case this match is 816 * in the middle of a string. 817 */ 818 for (k = i + 1 ; k < NOFFSETS; k++) { 819 size_t no; 820 int adjust = 1; 821 if (prpsoffsets(k) >= prpsoffsets(i)) 822 continue; 823 for (no = doff + prpsoffsets(k); 824 no < doff + prpsoffsets(i); no++) 825 adjust = adjust 826 && isprint(nbuf[no]); 827 if (adjust) 828 i = k; 829 } 830 831 cname = (unsigned char *) 832 &nbuf[doff + prpsoffsets(i)]; 833 for (cp = cname; *cp && isprint(*cp); cp++) 834 continue; 835 /* 836 * Linux apparently appends a space at the end 837 * of the command line: remove it. 838 */ 839 while (cp > cname && isspace(cp[-1])) 840 cp--; 841 if (file_printf(ms, ", from '%.*s'", 842 (int)(cp - cname), cname) == -1) 843 return 1; 844 *flags |= FLAGS_DID_CORE; 845 return 1; 846 847 tryanother: 848 ; 849 } 850 } 851 break; 852 } 853 #endif 854 return 0; 855 } 856 857 private off_t 858 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, 859 off_t off, int num, off_t fsize, uint64_t virtaddr) 860 { 861 Elf32_Phdr ph32; 862 Elf64_Phdr ph64; 863 864 /* 865 * Loop through all the program headers and find the header with 866 * virtual address in which the "virtaddr" belongs to. 867 */ 868 for ( ; num; num--) { 869 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 870 file_badread(ms); 871 return -1; 872 } 873 off += xph_sizeof; 874 875 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 876 /* Perhaps warn here */ 877 continue; 878 } 879 880 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) 881 return xph_offset + (virtaddr - xph_vaddr); 882 } 883 return 0; 884 } 885 886 private size_t 887 get_string_on_virtaddr(struct magic_set *ms, 888 int swap, int clazz, int fd, off_t ph_off, int ph_num, 889 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) 890 { 891 char *bptr; 892 off_t offset; 893 894 if (buflen == 0) 895 return 0; 896 897 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, 898 fsize, virtaddr); 899 if ((buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) { 900 file_badread(ms); 901 return 0; 902 } 903 904 buf[buflen - 1] = '\0'; 905 906 /* We expect only printable characters, so return if buffer contains 907 * non-printable character before the '\0' or just '\0'. */ 908 for (bptr = buf; *bptr && isprint((unsigned char)*bptr); bptr++) 909 continue; 910 if (*bptr != '\0') 911 return 0; 912 913 return bptr - buf; 914 } 915 916 917 /*ARGSUSED*/ 918 private int 919 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 920 int swap, uint32_t namesz __attribute__((__unused__)), 921 uint32_t descsz __attribute__((__unused__)), 922 size_t noff __attribute__((__unused__)), size_t doff, 923 int *flags, size_t size __attribute__((__unused__)), int clazz, 924 int fd, off_t ph_off, int ph_num, off_t fsize) 925 { 926 #ifdef ELFCORE 927 Aux32Info auxv32; 928 Aux64Info auxv64; 929 size_t elsize = xauxv_sizeof; 930 const char *tag; 931 int is_string; 932 size_t nval; 933 934 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != 935 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) 936 return 0; 937 938 switch (*flags & FLAGS_CORE_STYLE) { 939 case OS_STYLE_SVR4: 940 if (type != NT_AUXV) 941 return 0; 942 break; 943 #ifdef notyet 944 case OS_STYLE_NETBSD: 945 if (type != NT_NETBSD_CORE_AUXV) 946 return 0; 947 break; 948 case OS_STYLE_FREEBSD: 949 if (type != NT_FREEBSD_PROCSTAT_AUXV) 950 return 0; 951 break; 952 #endif 953 default: 954 return 0; 955 } 956 957 *flags |= FLAGS_DID_AUXV; 958 959 nval = 0; 960 for (size_t off = 0; off + elsize <= descsz; off += elsize) { 961 (void)memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 962 /* Limit processing to 50 vector entries to prevent DoS */ 963 if (nval++ >= 50) { 964 file_error(ms, 0, "Too many ELF Auxv elements"); 965 return 1; 966 } 967 968 switch(xauxv_type) { 969 case AT_LINUX_EXECFN: 970 is_string = 1; 971 tag = "execfn"; 972 break; 973 case AT_LINUX_PLATFORM: 974 is_string = 1; 975 tag = "platform"; 976 break; 977 case AT_LINUX_UID: 978 is_string = 0; 979 tag = "real uid"; 980 break; 981 case AT_LINUX_GID: 982 is_string = 0; 983 tag = "real gid"; 984 break; 985 case AT_LINUX_EUID: 986 is_string = 0; 987 tag = "effective uid"; 988 break; 989 case AT_LINUX_EGID: 990 is_string = 0; 991 tag = "effective gid"; 992 break; 993 default: 994 is_string = 0; 995 tag = NULL; 996 break; 997 } 998 999 if (tag == NULL) 1000 continue; 1001 1002 if (is_string) { 1003 char buf[256]; 1004 ssize_t buflen; 1005 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 1006 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 1007 1008 if (buflen == 0) 1009 continue; 1010 1011 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 1012 return 0; 1013 } else { 1014 if (file_printf(ms, ", %s: %d", tag, (int) xauxv_val) 1015 == -1) 1016 return 0; 1017 } 1018 } 1019 return 1; 1020 #else 1021 return 0; 1022 #endif 1023 } 1024 1025 private size_t 1026 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1027 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1028 int fd, off_t ph_off, int ph_num, off_t fsize) 1029 { 1030 Elf32_Nhdr nh32; 1031 Elf64_Nhdr nh64; 1032 size_t noff, doff; 1033 uint32_t namesz, descsz; 1034 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1035 1036 if (*notecount == 0) 1037 return 0; 1038 --*notecount; 1039 1040 if (xnh_sizeof + offset > size) { 1041 /* 1042 * We're out of note headers. 1043 */ 1044 return xnh_sizeof + offset; 1045 } 1046 1047 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1048 offset += xnh_sizeof; 1049 1050 namesz = xnh_namesz; 1051 descsz = xnh_descsz; 1052 1053 if ((namesz == 0) && (descsz == 0)) { 1054 /* 1055 * We're out of note headers. 1056 */ 1057 return (offset >= size) ? offset : size; 1058 } 1059 1060 if (namesz & 0x80000000) { 1061 (void)file_printf(ms, ", bad note name size %#lx", 1062 (unsigned long)namesz); 1063 return 0; 1064 } 1065 1066 if (descsz & 0x80000000) { 1067 (void)file_printf(ms, ", bad note description size %#lx", 1068 (unsigned long)descsz); 1069 return 0; 1070 } 1071 1072 noff = offset; 1073 doff = ELF_ALIGN(offset + namesz); 1074 1075 if (offset + namesz > size) { 1076 /* 1077 * We're past the end of the buffer. 1078 */ 1079 return doff; 1080 } 1081 1082 offset = ELF_ALIGN(doff + descsz); 1083 if (doff + descsz > size) { 1084 /* 1085 * We're past the end of the buffer. 1086 */ 1087 return (offset >= size) ? offset : size; 1088 } 1089 1090 1091 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1092 if (do_os_note(ms, nbuf, xnh_type, swap, 1093 namesz, descsz, noff, doff, flags)) 1094 return offset; 1095 } 1096 1097 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1098 if (do_bid_note(ms, nbuf, xnh_type, swap, 1099 namesz, descsz, noff, doff, flags)) 1100 return offset; 1101 } 1102 1103 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1104 if (do_pax_note(ms, nbuf, xnh_type, swap, 1105 namesz, descsz, noff, doff, flags)) 1106 return offset; 1107 } 1108 1109 if ((*flags & FLAGS_DID_CORE) == 0) { 1110 if (do_core_note(ms, nbuf, xnh_type, swap, 1111 namesz, descsz, noff, doff, flags, size, clazz)) 1112 return offset; 1113 } 1114 1115 if ((*flags & FLAGS_DID_AUXV) == 0) { 1116 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1117 namesz, descsz, noff, doff, flags, size, clazz, 1118 fd, ph_off, ph_num, fsize)) 1119 return offset; 1120 } 1121 1122 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 1123 if (descsz > 100) 1124 descsz = 100; 1125 switch (xnh_type) { 1126 case NT_NETBSD_VERSION: 1127 return offset; 1128 case NT_NETBSD_MARCH: 1129 if (*flags & FLAGS_DID_NETBSD_MARCH) 1130 return offset; 1131 *flags |= FLAGS_DID_NETBSD_MARCH; 1132 if (file_printf(ms, ", compiled for: %.*s", 1133 (int)descsz, (const char *)&nbuf[doff]) == -1) 1134 return offset; 1135 break; 1136 case NT_NETBSD_CMODEL: 1137 if (*flags & FLAGS_DID_NETBSD_CMODEL) 1138 return offset; 1139 *flags |= FLAGS_DID_NETBSD_CMODEL; 1140 if (file_printf(ms, ", compiler model: %.*s", 1141 (int)descsz, (const char *)&nbuf[doff]) == -1) 1142 return offset; 1143 break; 1144 default: 1145 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1146 return offset; 1147 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1148 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1149 return offset; 1150 break; 1151 } 1152 return offset; 1153 } 1154 1155 return offset; 1156 } 1157 1158 /* SunOS 5.x hardware capability descriptions */ 1159 typedef struct cap_desc { 1160 uint64_t cd_mask; 1161 const char *cd_name; 1162 } cap_desc_t; 1163 1164 static const cap_desc_t cap_desc_sparc[] = { 1165 { AV_SPARC_MUL32, "MUL32" }, 1166 { AV_SPARC_DIV32, "DIV32" }, 1167 { AV_SPARC_FSMULD, "FSMULD" }, 1168 { AV_SPARC_V8PLUS, "V8PLUS" }, 1169 { AV_SPARC_POPC, "POPC" }, 1170 { AV_SPARC_VIS, "VIS" }, 1171 { AV_SPARC_VIS2, "VIS2" }, 1172 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1173 { AV_SPARC_FMAF, "FMAF" }, 1174 { AV_SPARC_FJFMAU, "FJFMAU" }, 1175 { AV_SPARC_IMA, "IMA" }, 1176 { 0, NULL } 1177 }; 1178 1179 static const cap_desc_t cap_desc_386[] = { 1180 { AV_386_FPU, "FPU" }, 1181 { AV_386_TSC, "TSC" }, 1182 { AV_386_CX8, "CX8" }, 1183 { AV_386_SEP, "SEP" }, 1184 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1185 { AV_386_CMOV, "CMOV" }, 1186 { AV_386_MMX, "MMX" }, 1187 { AV_386_AMD_MMX, "AMD_MMX" }, 1188 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1189 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1190 { AV_386_FXSR, "FXSR" }, 1191 { AV_386_SSE, "SSE" }, 1192 { AV_386_SSE2, "SSE2" }, 1193 { AV_386_PAUSE, "PAUSE" }, 1194 { AV_386_SSE3, "SSE3" }, 1195 { AV_386_MON, "MON" }, 1196 { AV_386_CX16, "CX16" }, 1197 { AV_386_AHF, "AHF" }, 1198 { AV_386_TSCP, "TSCP" }, 1199 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1200 { AV_386_POPCNT, "POPCNT" }, 1201 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1202 { AV_386_SSSE3, "SSSE3" }, 1203 { AV_386_SSE4_1, "SSE4.1" }, 1204 { AV_386_SSE4_2, "SSE4.2" }, 1205 { 0, NULL } 1206 }; 1207 1208 private int 1209 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1210 size_t size, off_t fsize, int mach, int strtab, int *flags, 1211 uint16_t *notecount) 1212 { 1213 Elf32_Shdr sh32; 1214 Elf64_Shdr sh64; 1215 int stripped = 1, has_debug_info = 0; 1216 size_t nbadcap = 0; 1217 void *nbuf; 1218 off_t noff, coff, name_off; 1219 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ 1220 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ 1221 char name[50]; 1222 ssize_t namesize; 1223 1224 if (size != xsh_sizeof) { 1225 if (file_printf(ms, ", corrupted section header size") == -1) 1226 return -1; 1227 return 0; 1228 } 1229 1230 /* Read offset of name section to be able to read section names later */ 1231 if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab))) 1232 < (ssize_t)xsh_sizeof) { 1233 if (file_printf(ms, ", missing section headers") == -1) 1234 return -1; 1235 return 0; 1236 } 1237 name_off = xsh_offset; 1238 1239 for ( ; num; num--) { 1240 /* Read the name of this section. */ 1241 if ((namesize = pread(fd, name, sizeof(name) - 1, name_off + xsh_name)) == -1) { 1242 file_badread(ms); 1243 return -1; 1244 } 1245 name[namesize] = '\0'; 1246 if (strcmp(name, ".debug_info") == 0) { 1247 has_debug_info = 1; 1248 stripped = 0; 1249 } 1250 1251 if (pread(fd, xsh_addr, xsh_sizeof, off) < (ssize_t)xsh_sizeof) { 1252 file_badread(ms); 1253 return -1; 1254 } 1255 off += size; 1256 1257 /* Things we can determine before we seek */ 1258 switch (xsh_type) { 1259 case SHT_SYMTAB: 1260 #if 0 1261 case SHT_DYNSYM: 1262 #endif 1263 stripped = 0; 1264 break; 1265 default: 1266 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1267 /* Perhaps warn here */ 1268 continue; 1269 } 1270 break; 1271 } 1272 1273 1274 /* Things we can determine when we seek */ 1275 switch (xsh_type) { 1276 case SHT_NOTE: 1277 if ((uintmax_t)(xsh_size + xsh_offset) > 1278 (uintmax_t)fsize) { 1279 if (file_printf(ms, 1280 ", note offset/size %#" INTMAX_T_FORMAT 1281 "x+%#" INTMAX_T_FORMAT "x exceeds" 1282 " file size %#" INTMAX_T_FORMAT "x", 1283 (uintmax_t)xsh_offset, (uintmax_t)xsh_size, 1284 (uintmax_t)fsize) == -1) 1285 return -1; 1286 return 0; 1287 } 1288 if ((nbuf = malloc(xsh_size)) == NULL) { 1289 file_error(ms, errno, "Cannot allocate memory" 1290 " for note"); 1291 return -1; 1292 } 1293 if (pread(fd, nbuf, xsh_size, xsh_offset) < 1294 (ssize_t)xsh_size) { 1295 file_badread(ms); 1296 free(nbuf); 1297 return -1; 1298 } 1299 1300 noff = 0; 1301 for (;;) { 1302 if (noff >= (off_t)xsh_size) 1303 break; 1304 noff = donote(ms, nbuf, (size_t)noff, 1305 xsh_size, clazz, swap, 4, flags, notecount, 1306 fd, 0, 0, 0); 1307 if (noff == 0) 1308 break; 1309 } 1310 free(nbuf); 1311 break; 1312 case SHT_SUNW_cap: 1313 switch (mach) { 1314 case EM_SPARC: 1315 case EM_SPARCV9: 1316 case EM_IA_64: 1317 case EM_386: 1318 case EM_AMD64: 1319 break; 1320 default: 1321 goto skip; 1322 } 1323 1324 if (nbadcap > 5) 1325 break; 1326 if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) { 1327 file_badseek(ms); 1328 return -1; 1329 } 1330 coff = 0; 1331 for (;;) { 1332 Elf32_Cap cap32; 1333 Elf64_Cap cap64; 1334 char cbuf[/*CONSTCOND*/ 1335 MAX(sizeof cap32, sizeof cap64)]; 1336 if ((coff += xcap_sizeof) > (off_t)xsh_size) 1337 break; 1338 if (read(fd, cbuf, (size_t)xcap_sizeof) != 1339 (ssize_t)xcap_sizeof) { 1340 file_badread(ms); 1341 return -1; 1342 } 1343 if (cbuf[0] == 'A') { 1344 #ifdef notyet 1345 char *p = cbuf + 1; 1346 uint32_t len, tag; 1347 memcpy(&len, p, sizeof(len)); 1348 p += 4; 1349 len = getu32(swap, len); 1350 if (memcmp("gnu", p, 3) != 0) { 1351 if (file_printf(ms, 1352 ", unknown capability %.3s", p) 1353 == -1) 1354 return -1; 1355 break; 1356 } 1357 p += strlen(p) + 1; 1358 tag = *p++; 1359 memcpy(&len, p, sizeof(len)); 1360 p += 4; 1361 len = getu32(swap, len); 1362 if (tag != 1) { 1363 if (file_printf(ms, ", unknown gnu" 1364 " capability tag %d", tag) 1365 == -1) 1366 return -1; 1367 break; 1368 } 1369 // gnu attributes 1370 #endif 1371 break; 1372 } 1373 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 1374 switch (xcap_tag) { 1375 case CA_SUNW_NULL: 1376 break; 1377 case CA_SUNW_HW_1: 1378 cap_hw1 |= xcap_val; 1379 break; 1380 case CA_SUNW_SF_1: 1381 cap_sf1 |= xcap_val; 1382 break; 1383 default: 1384 if (file_printf(ms, 1385 ", with unknown capability " 1386 "%#" INT64_T_FORMAT "x = %#" 1387 INT64_T_FORMAT "x", 1388 (unsigned long long)xcap_tag, 1389 (unsigned long long)xcap_val) == -1) 1390 return -1; 1391 if (nbadcap++ > 2) 1392 coff = xsh_size; 1393 break; 1394 } 1395 } 1396 /*FALLTHROUGH*/ 1397 skip: 1398 default: 1399 break; 1400 } 1401 } 1402 1403 if (has_debug_info) { 1404 if (file_printf(ms, ", with debug_info") == -1) 1405 return -1; 1406 } 1407 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1408 return -1; 1409 if (cap_hw1) { 1410 const cap_desc_t *cdp; 1411 switch (mach) { 1412 case EM_SPARC: 1413 case EM_SPARC32PLUS: 1414 case EM_SPARCV9: 1415 cdp = cap_desc_sparc; 1416 break; 1417 case EM_386: 1418 case EM_IA_64: 1419 case EM_AMD64: 1420 cdp = cap_desc_386; 1421 break; 1422 default: 1423 cdp = NULL; 1424 break; 1425 } 1426 if (file_printf(ms, ", uses") == -1) 1427 return -1; 1428 if (cdp) { 1429 while (cdp->cd_name) { 1430 if (cap_hw1 & cdp->cd_mask) { 1431 if (file_printf(ms, 1432 " %s", cdp->cd_name) == -1) 1433 return -1; 1434 cap_hw1 &= ~cdp->cd_mask; 1435 } 1436 ++cdp; 1437 } 1438 if (cap_hw1) 1439 if (file_printf(ms, 1440 " unknown hardware capability %#" 1441 INT64_T_FORMAT "x", 1442 (unsigned long long)cap_hw1) == -1) 1443 return -1; 1444 } else { 1445 if (file_printf(ms, 1446 " hardware capability %#" INT64_T_FORMAT "x", 1447 (unsigned long long)cap_hw1) == -1) 1448 return -1; 1449 } 1450 } 1451 if (cap_sf1) { 1452 if (cap_sf1 & SF1_SUNW_FPUSED) { 1453 if (file_printf(ms, 1454 (cap_sf1 & SF1_SUNW_FPKNWN) 1455 ? ", uses frame pointer" 1456 : ", not known to use frame pointer") == -1) 1457 return -1; 1458 } 1459 cap_sf1 &= ~SF1_SUNW_MASK; 1460 if (cap_sf1) 1461 if (file_printf(ms, 1462 ", with unknown software capability %#" 1463 INT64_T_FORMAT "x", 1464 (unsigned long long)cap_sf1) == -1) 1465 return -1; 1466 } 1467 return 0; 1468 } 1469 1470 /* 1471 * Look through the program headers of an executable image, searching 1472 * for a PT_INTERP section; if one is found, it's dynamically linked, 1473 * otherwise it's statically linked. 1474 */ 1475 private int 1476 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1477 int num, size_t size, off_t fsize, int sh_num, int *flags, 1478 uint16_t *notecount) 1479 { 1480 Elf32_Phdr ph32; 1481 Elf64_Phdr ph64; 1482 const char *linking_style = "statically"; 1483 const char *interp = ""; 1484 unsigned char nbuf[BUFSIZ]; 1485 char ibuf[BUFSIZ]; 1486 ssize_t bufsize; 1487 size_t offset, align, len; 1488 1489 if (size != xph_sizeof) { 1490 if (file_printf(ms, ", corrupted program header size") == -1) 1491 return -1; 1492 return 0; 1493 } 1494 1495 for ( ; num; num--) { 1496 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 1497 file_badread(ms); 1498 return -1; 1499 } 1500 1501 off += size; 1502 bufsize = 0; 1503 align = 4; 1504 1505 /* Things we can determine before we seek */ 1506 switch (xph_type) { 1507 case PT_DYNAMIC: 1508 linking_style = "dynamically"; 1509 break; 1510 case PT_NOTE: 1511 if (sh_num) /* Did this through section headers */ 1512 continue; 1513 if (((align = xph_align) & 0x80000000UL) != 0 || 1514 align < 4) { 1515 if (file_printf(ms, 1516 ", invalid note alignment %#lx", 1517 (unsigned long)align) == -1) 1518 return -1; 1519 align = 4; 1520 } 1521 /*FALLTHROUGH*/ 1522 case PT_INTERP: 1523 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1524 : sizeof(nbuf); 1525 bufsize = pread(fd, nbuf, len, xph_offset); 1526 if (bufsize == -1) { 1527 file_badread(ms); 1528 return -1; 1529 } 1530 break; 1531 default: 1532 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1533 /* Maybe warn here? */ 1534 continue; 1535 } 1536 break; 1537 } 1538 1539 /* Things we can determine when we seek */ 1540 switch (xph_type) { 1541 case PT_INTERP: 1542 if (bufsize && nbuf[0]) { 1543 nbuf[bufsize - 1] = '\0'; 1544 interp = (const char *)nbuf; 1545 } else 1546 interp = "*empty*"; 1547 break; 1548 case PT_NOTE: 1549 /* 1550 * This is a PT_NOTE section; loop through all the notes 1551 * in the section. 1552 */ 1553 offset = 0; 1554 for (;;) { 1555 if (offset >= (size_t)bufsize) 1556 break; 1557 offset = donote(ms, nbuf, offset, 1558 (size_t)bufsize, clazz, swap, align, 1559 flags, notecount, fd, 0, 0, 0); 1560 if (offset == 0) 1561 break; 1562 } 1563 break; 1564 default: 1565 break; 1566 } 1567 } 1568 if (file_printf(ms, ", %s linked", linking_style) 1569 == -1) 1570 return -1; 1571 if (interp[0]) 1572 if (file_printf(ms, ", interpreter %s", 1573 file_printable(ibuf, sizeof(ibuf), interp)) == -1) 1574 return -1; 1575 return 0; 1576 } 1577 1578 1579 protected int 1580 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, 1581 size_t nbytes) 1582 { 1583 union { 1584 int32_t l; 1585 char c[sizeof (int32_t)]; 1586 } u; 1587 int clazz; 1588 int swap; 1589 struct stat st; 1590 off_t fsize; 1591 int flags = 0; 1592 Elf32_Ehdr elf32hdr; 1593 Elf64_Ehdr elf64hdr; 1594 uint16_t type, phnum, shnum, notecount; 1595 1596 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION)) 1597 return 0; 1598 /* 1599 * ELF executables have multiple section headers in arbitrary 1600 * file locations and thus file(1) cannot determine it from easily. 1601 * Instead we traverse thru all section headers until a symbol table 1602 * one is found or else the binary is stripped. 1603 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1604 */ 1605 if (buf[EI_MAG0] != ELFMAG0 1606 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1607 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1608 return 0; 1609 1610 /* 1611 * If we cannot seek, it must be a pipe, socket or fifo. 1612 */ 1613 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1614 fd = file_pipe2file(ms, fd, buf, nbytes); 1615 1616 if (fstat(fd, &st) == -1) { 1617 file_badread(ms); 1618 return -1; 1619 } 1620 if (S_ISREG(st.st_mode) || st.st_size != 0) 1621 fsize = st.st_size; 1622 else 1623 fsize = SIZE_UNKNOWN; 1624 1625 clazz = buf[EI_CLASS]; 1626 1627 switch (clazz) { 1628 case ELFCLASS32: 1629 #undef elf_getu 1630 #define elf_getu(a, b) elf_getu32(a, b) 1631 #undef elfhdr 1632 #define elfhdr elf32hdr 1633 #include "elfclass.h" 1634 case ELFCLASS64: 1635 #undef elf_getu 1636 #define elf_getu(a, b) elf_getu64(a, b) 1637 #undef elfhdr 1638 #define elfhdr elf64hdr 1639 #include "elfclass.h" 1640 default: 1641 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1642 return -1; 1643 break; 1644 } 1645 return 0; 1646 } 1647 #endif 1648