1 /* $NetBSD: readelf.c,v 1.14 2017/02/11 18:17:29 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 1.130 2017/01/29 19:34:24 christos Exp $") 34 #else 35 __RCSID("$NetBSD: readelf.c,v 1.14 2017/02/11 18:17:29 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_DID_CORE 0x001 320 #define FLAGS_DID_OS_NOTE 0x002 321 #define FLAGS_DID_BUILD_ID 0x004 322 #define FLAGS_DID_CORE_STYLE 0x008 323 #define FLAGS_DID_NETBSD_PAX 0x010 324 #define FLAGS_DID_NETBSD_MARCH 0x020 325 #define FLAGS_DID_NETBSD_CMODEL 0x040 326 #define FLAGS_DID_NETBSD_UNKNOWN 0x080 327 #define FLAGS_IS_CORE 0x100 328 #define FLAGS_DID_AUXV 0x200 329 330 private int 331 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 332 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 333 { 334 Elf32_Phdr ph32; 335 Elf64_Phdr ph64; 336 size_t offset, len; 337 unsigned char nbuf[BUFSIZ]; 338 ssize_t bufsize; 339 off_t ph_off = off; 340 int ph_num = num; 341 342 if (size != xph_sizeof) { 343 if (file_printf(ms, ", corrupted program header size") == -1) 344 return -1; 345 return 0; 346 } 347 348 /* 349 * Loop through all the program headers. 350 */ 351 for ( ; num; num--) { 352 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 353 file_badread(ms); 354 return -1; 355 } 356 off += size; 357 358 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 359 /* Perhaps warn here */ 360 continue; 361 } 362 363 if (xph_type != PT_NOTE) 364 continue; 365 366 /* 367 * This is a PT_NOTE section; loop through all the notes 368 * in the section. 369 */ 370 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 371 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) { 372 file_badread(ms); 373 return -1; 374 } 375 offset = 0; 376 for (;;) { 377 if (offset >= (size_t)bufsize) 378 break; 379 offset = donote(ms, nbuf, offset, (size_t)bufsize, 380 clazz, swap, 4, flags, notecount, fd, ph_off, 381 ph_num, fsize); 382 if (offset == 0) 383 break; 384 385 } 386 } 387 return 0; 388 } 389 #endif 390 391 static void 392 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 393 { 394 uint32_t desc; 395 (void)memcpy(&desc, v, sizeof(desc)); 396 desc = elf_getu32(swap, desc); 397 398 if (file_printf(ms, ", for NetBSD") == -1) 399 return; 400 /* 401 * The version number used to be stuck as 199905, and was thus 402 * basically content-free. Newer versions of NetBSD have fixed 403 * this and now use the encoding of __NetBSD_Version__: 404 * 405 * MMmmrrpp00 406 * 407 * M = major version 408 * m = minor version 409 * r = release ["",A-Z,Z[A-Z] but numeric] 410 * p = patchlevel 411 */ 412 if (desc > 100000000U) { 413 uint32_t ver_patch = (desc / 100) % 100; 414 uint32_t ver_rel = (desc / 10000) % 100; 415 uint32_t ver_min = (desc / 1000000) % 100; 416 uint32_t ver_maj = desc / 100000000; 417 418 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 419 return; 420 if (ver_rel == 0 && ver_patch != 0) { 421 if (file_printf(ms, ".%u", ver_patch) == -1) 422 return; 423 } else if (ver_rel != 0) { 424 while (ver_rel > 26) { 425 if (file_printf(ms, "Z") == -1) 426 return; 427 ver_rel -= 26; 428 } 429 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 430 == -1) 431 return; 432 } 433 } 434 } 435 436 static void 437 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 438 { 439 uint32_t desc; 440 441 (void)memcpy(&desc, v, sizeof(desc)); 442 desc = elf_getu32(swap, desc); 443 if (file_printf(ms, ", for FreeBSD") == -1) 444 return; 445 446 /* 447 * Contents is __FreeBSD_version, whose relation to OS 448 * versions is defined by a huge table in the Porter's 449 * Handbook. This is the general scheme: 450 * 451 * Releases: 452 * Mmp000 (before 4.10) 453 * Mmi0p0 (before 5.0) 454 * Mmm0p0 455 * 456 * Development branches: 457 * Mmpxxx (before 4.6) 458 * Mmp1xx (before 4.10) 459 * Mmi1xx (before 5.0) 460 * M000xx (pre-M.0) 461 * Mmm1xx 462 * 463 * M = major version 464 * m = minor version 465 * i = minor version increment (491000 -> 4.10) 466 * p = patchlevel 467 * x = revision 468 * 469 * The first release of FreeBSD to use ELF by default 470 * was version 3.0. 471 */ 472 if (desc == 460002) { 473 if (file_printf(ms, " 4.6.2") == -1) 474 return; 475 } else if (desc < 460100) { 476 if (file_printf(ms, " %d.%d", desc / 100000, 477 desc / 10000 % 10) == -1) 478 return; 479 if (desc / 1000 % 10 > 0) 480 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 481 return; 482 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 483 if (file_printf(ms, " (%d)", desc) == -1) 484 return; 485 } else if (desc < 500000) { 486 if (file_printf(ms, " %d.%d", desc / 100000, 487 desc / 10000 % 10 + desc / 1000 % 10) == -1) 488 return; 489 if (desc / 100 % 10 > 0) { 490 if (file_printf(ms, " (%d)", desc) == -1) 491 return; 492 } else if (desc / 10 % 10 > 0) { 493 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 494 return; 495 } 496 } else { 497 if (file_printf(ms, " %d.%d", desc / 100000, 498 desc / 1000 % 100) == -1) 499 return; 500 if ((desc / 100 % 10 > 0) || 501 (desc % 100000 / 100 == 0)) { 502 if (file_printf(ms, " (%d)", desc) == -1) 503 return; 504 } else if (desc / 10 % 10 > 0) { 505 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 506 return; 507 } 508 } 509 } 510 511 private int 512 /*ARGSUSED*/ 513 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 514 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 515 size_t noff, size_t doff, int *flags) 516 { 517 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 518 type == NT_GNU_BUILD_ID && (descsz >= 4 || descsz <= 20)) { 519 uint8_t desc[20]; 520 const char *btype; 521 uint32_t i; 522 *flags |= FLAGS_DID_BUILD_ID; 523 switch (descsz) { 524 case 8: 525 btype = "xxHash"; 526 break; 527 case 16: 528 btype = "md5/uuid"; 529 break; 530 case 20: 531 btype = "sha1"; 532 break; 533 default: 534 btype = "unknown"; 535 break; 536 } 537 if (file_printf(ms, ", BuildID[%s]=", btype) == -1) 538 return 1; 539 (void)memcpy(desc, &nbuf[doff], descsz); 540 for (i = 0; i < descsz; i++) 541 if (file_printf(ms, "%02x", desc[i]) == -1) 542 return 1; 543 return 1; 544 } 545 return 0; 546 } 547 548 private int 549 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 550 int swap, uint32_t namesz, uint32_t descsz, 551 size_t noff, size_t doff, int *flags) 552 { 553 if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 && 554 type == NT_GNU_VERSION && descsz == 2) { 555 *flags |= FLAGS_DID_OS_NOTE; 556 file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]); 557 return 1; 558 } 559 560 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 561 type == NT_GNU_VERSION && descsz == 16) { 562 uint32_t desc[4]; 563 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 564 565 *flags |= FLAGS_DID_OS_NOTE; 566 if (file_printf(ms, ", for GNU/") == -1) 567 return 1; 568 switch (elf_getu32(swap, desc[0])) { 569 case GNU_OS_LINUX: 570 if (file_printf(ms, "Linux") == -1) 571 return 1; 572 break; 573 case GNU_OS_HURD: 574 if (file_printf(ms, "Hurd") == -1) 575 return 1; 576 break; 577 case GNU_OS_SOLARIS: 578 if (file_printf(ms, "Solaris") == -1) 579 return 1; 580 break; 581 case GNU_OS_KFREEBSD: 582 if (file_printf(ms, "kFreeBSD") == -1) 583 return 1; 584 break; 585 case GNU_OS_KNETBSD: 586 if (file_printf(ms, "kNetBSD") == -1) 587 return 1; 588 break; 589 default: 590 if (file_printf(ms, "<unknown>") == -1) 591 return 1; 592 } 593 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 594 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 595 return 1; 596 return 1; 597 } 598 599 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 600 if (type == NT_NETBSD_VERSION && descsz == 4) { 601 *flags |= FLAGS_DID_OS_NOTE; 602 do_note_netbsd_version(ms, swap, &nbuf[doff]); 603 return 1; 604 } 605 } 606 607 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) { 608 if (type == NT_FREEBSD_VERSION && descsz == 4) { 609 *flags |= FLAGS_DID_OS_NOTE; 610 do_note_freebsd_version(ms, swap, &nbuf[doff]); 611 return 1; 612 } 613 } 614 615 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && 616 type == NT_OPENBSD_VERSION && descsz == 4) { 617 *flags |= FLAGS_DID_OS_NOTE; 618 if (file_printf(ms, ", for OpenBSD") == -1) 619 return 1; 620 /* Content of note is always 0 */ 621 return 1; 622 } 623 624 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && 625 type == NT_DRAGONFLY_VERSION && descsz == 4) { 626 uint32_t desc; 627 *flags |= FLAGS_DID_OS_NOTE; 628 if (file_printf(ms, ", for DragonFly") == -1) 629 return 1; 630 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 631 desc = elf_getu32(swap, desc); 632 if (file_printf(ms, " %d.%d.%d", desc / 100000, 633 desc / 10000 % 10, desc % 10000) == -1) 634 return 1; 635 return 1; 636 } 637 return 0; 638 } 639 640 private int 641 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 642 int swap, uint32_t namesz, uint32_t descsz, 643 size_t noff, size_t doff, int *flags) 644 { 645 if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 && 646 type == NT_NETBSD_PAX && descsz == 4) { 647 static const char *pax[] = { 648 "+mprotect", 649 "-mprotect", 650 "+segvguard", 651 "-segvguard", 652 "+ASLR", 653 "-ASLR", 654 }; 655 uint32_t desc; 656 size_t i; 657 int did = 0; 658 659 *flags |= FLAGS_DID_NETBSD_PAX; 660 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 661 desc = elf_getu32(swap, desc); 662 663 if (desc && file_printf(ms, ", PaX: ") == -1) 664 return 1; 665 666 for (i = 0; i < __arraycount(pax); i++) { 667 if (((1 << (int)i) & desc) == 0) 668 continue; 669 if (file_printf(ms, "%s%s", did++ ? "," : "", 670 pax[i]) == -1) 671 return 1; 672 } 673 return 1; 674 } 675 return 0; 676 } 677 678 private int 679 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 680 int swap, uint32_t namesz, uint32_t descsz, 681 size_t noff, size_t doff, int *flags, size_t size, int clazz) 682 { 683 #ifdef ELFCORE 684 int os_style = -1; 685 /* 686 * Sigh. The 2.0.36 kernel in Debian 2.1, at 687 * least, doesn't correctly implement name 688 * sections, in core dumps, as specified by 689 * the "Program Linking" section of "UNIX(R) System 690 * V Release 4 Programmer's Guide: ANSI C and 691 * Programming Support Tools", because my copy 692 * clearly says "The first 'namesz' bytes in 'name' 693 * contain a *null-terminated* [emphasis mine] 694 * character representation of the entry's owner 695 * or originator", but the 2.0.36 kernel code 696 * doesn't include the terminating null in the 697 * name.... 698 */ 699 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || 700 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { 701 os_style = OS_STYLE_SVR4; 702 } 703 704 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { 705 os_style = OS_STYLE_FREEBSD; 706 } 707 708 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) 709 == 0)) { 710 os_style = OS_STYLE_NETBSD; 711 } 712 713 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 714 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 715 == -1) 716 return 1; 717 *flags |= FLAGS_DID_CORE_STYLE; 718 } 719 720 switch (os_style) { 721 case OS_STYLE_NETBSD: 722 if (type == NT_NETBSD_CORE_PROCINFO) { 723 char sbuf[512]; 724 uint32_t signo; 725 /* 726 * Extract the program name. It is at 727 * offset 0x7c, and is up to 32-bytes, 728 * including the terminating NUL. 729 */ 730 if (file_printf(ms, ", from '%.31s'", 731 file_printable(sbuf, sizeof(sbuf), 732 (const char *)&nbuf[doff + 0x7c])) == -1) 733 return 1; 734 735 /* 736 * Extract the signal number. It is at 737 * offset 0x08. 738 */ 739 (void)memcpy(&signo, &nbuf[doff + 0x08], 740 sizeof(signo)); 741 if (file_printf(ms, " (signal %u)", 742 elf_getu32(swap, signo)) == -1) 743 return 1; 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 private int 918 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 919 int swap, uint32_t namesz __attribute__((__unused__)), 920 uint32_t descsz __attribute__((__unused__)), 921 size_t noff __attribute__((__unused__)), size_t doff, 922 int *flags, size_t size __attribute__((__unused__)), int clazz, 923 int fd, off_t ph_off, int ph_num, off_t fsize) 924 { 925 #ifdef ELFCORE 926 Aux32Info auxv32; 927 Aux64Info auxv64; 928 size_t elsize = xauxv_sizeof; 929 const char *tag; 930 int is_string; 931 size_t nval; 932 933 if (type != NT_AUXV || (*flags & FLAGS_IS_CORE) == 0) 934 return 0; 935 936 *flags |= FLAGS_DID_AUXV; 937 938 nval = 0; 939 for (size_t off = 0; off + elsize <= descsz; off += elsize) { 940 (void)memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 941 /* Limit processing to 50 vector entries to prevent DoS */ 942 if (nval++ >= 50) { 943 file_error(ms, 0, "Too many ELF Auxv elements"); 944 return 1; 945 } 946 947 switch(xauxv_type) { 948 case AT_LINUX_EXECFN: 949 is_string = 1; 950 tag = "execfn"; 951 break; 952 case AT_LINUX_PLATFORM: 953 is_string = 1; 954 tag = "platform"; 955 break; 956 case AT_LINUX_UID: 957 is_string = 0; 958 tag = "real uid"; 959 break; 960 case AT_LINUX_GID: 961 is_string = 0; 962 tag = "real gid"; 963 break; 964 case AT_LINUX_EUID: 965 is_string = 0; 966 tag = "effective uid"; 967 break; 968 case AT_LINUX_EGID: 969 is_string = 0; 970 tag = "effective gid"; 971 break; 972 default: 973 is_string = 0; 974 tag = NULL; 975 break; 976 } 977 978 if (tag == NULL) 979 continue; 980 981 if (is_string) { 982 char buf[256]; 983 ssize_t buflen; 984 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 985 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 986 987 if (buflen == 0) 988 continue; 989 990 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 991 return 0; 992 } else { 993 if (file_printf(ms, ", %s: %d", tag, (int) xauxv_val) 994 == -1) 995 return 0; 996 } 997 } 998 return 1; 999 #else 1000 return 0; 1001 #endif 1002 } 1003 1004 private size_t 1005 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1006 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1007 int fd, off_t ph_off, int ph_num, off_t fsize) 1008 { 1009 Elf32_Nhdr nh32; 1010 Elf64_Nhdr nh64; 1011 size_t noff, doff; 1012 uint32_t namesz, descsz; 1013 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1014 1015 if (*notecount == 0) 1016 return 0; 1017 --*notecount; 1018 1019 if (xnh_sizeof + offset > size) { 1020 /* 1021 * We're out of note headers. 1022 */ 1023 return xnh_sizeof + offset; 1024 } 1025 1026 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1027 offset += xnh_sizeof; 1028 1029 namesz = xnh_namesz; 1030 descsz = xnh_descsz; 1031 1032 if ((namesz == 0) && (descsz == 0)) { 1033 /* 1034 * We're out of note headers. 1035 */ 1036 return (offset >= size) ? offset : size; 1037 } 1038 1039 if (namesz & 0x80000000) { 1040 (void)file_printf(ms, ", bad note name size 0x%lx", 1041 (unsigned long)namesz); 1042 return 0; 1043 } 1044 1045 if (descsz & 0x80000000) { 1046 (void)file_printf(ms, ", bad note description size 0x%lx", 1047 (unsigned long)descsz); 1048 return 0; 1049 } 1050 1051 noff = offset; 1052 doff = ELF_ALIGN(offset + namesz); 1053 1054 if (offset + namesz > size) { 1055 /* 1056 * We're past the end of the buffer. 1057 */ 1058 return doff; 1059 } 1060 1061 offset = ELF_ALIGN(doff + descsz); 1062 if (doff + descsz > size) { 1063 /* 1064 * We're past the end of the buffer. 1065 */ 1066 return (offset >= size) ? offset : size; 1067 } 1068 1069 1070 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1071 if (do_os_note(ms, nbuf, xnh_type, swap, 1072 namesz, descsz, noff, doff, flags)) 1073 return offset; 1074 } 1075 1076 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1077 if (do_bid_note(ms, nbuf, xnh_type, swap, 1078 namesz, descsz, noff, doff, flags)) 1079 return offset; 1080 } 1081 1082 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1083 if (do_pax_note(ms, nbuf, xnh_type, swap, 1084 namesz, descsz, noff, doff, flags)) 1085 return offset; 1086 } 1087 1088 if ((*flags & FLAGS_DID_CORE) == 0) { 1089 if (do_core_note(ms, nbuf, xnh_type, swap, 1090 namesz, descsz, noff, doff, flags, size, clazz)) 1091 return offset; 1092 } 1093 1094 if ((*flags & FLAGS_DID_AUXV) == 0) { 1095 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1096 namesz, descsz, noff, doff, flags, size, clazz, 1097 fd, ph_off, ph_num, fsize)) 1098 return offset; 1099 } 1100 1101 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 1102 if (descsz > 100) 1103 descsz = 100; 1104 switch (xnh_type) { 1105 case NT_NETBSD_VERSION: 1106 return offset; 1107 case NT_NETBSD_MARCH: 1108 if (*flags & FLAGS_DID_NETBSD_MARCH) 1109 return offset; 1110 *flags |= FLAGS_DID_NETBSD_MARCH; 1111 if (file_printf(ms, ", compiled for: %.*s", 1112 (int)descsz, (const char *)&nbuf[doff]) == -1) 1113 return offset; 1114 break; 1115 case NT_NETBSD_CMODEL: 1116 if (*flags & FLAGS_DID_NETBSD_CMODEL) 1117 return offset; 1118 *flags |= FLAGS_DID_NETBSD_CMODEL; 1119 if (file_printf(ms, ", compiler model: %.*s", 1120 (int)descsz, (const char *)&nbuf[doff]) == -1) 1121 return offset; 1122 break; 1123 default: 1124 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1125 return offset; 1126 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1127 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1128 return offset; 1129 break; 1130 } 1131 return offset; 1132 } 1133 1134 return offset; 1135 } 1136 1137 /* SunOS 5.x hardware capability descriptions */ 1138 typedef struct cap_desc { 1139 uint64_t cd_mask; 1140 const char *cd_name; 1141 } cap_desc_t; 1142 1143 static const cap_desc_t cap_desc_sparc[] = { 1144 { AV_SPARC_MUL32, "MUL32" }, 1145 { AV_SPARC_DIV32, "DIV32" }, 1146 { AV_SPARC_FSMULD, "FSMULD" }, 1147 { AV_SPARC_V8PLUS, "V8PLUS" }, 1148 { AV_SPARC_POPC, "POPC" }, 1149 { AV_SPARC_VIS, "VIS" }, 1150 { AV_SPARC_VIS2, "VIS2" }, 1151 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1152 { AV_SPARC_FMAF, "FMAF" }, 1153 { AV_SPARC_FJFMAU, "FJFMAU" }, 1154 { AV_SPARC_IMA, "IMA" }, 1155 { 0, NULL } 1156 }; 1157 1158 static const cap_desc_t cap_desc_386[] = { 1159 { AV_386_FPU, "FPU" }, 1160 { AV_386_TSC, "TSC" }, 1161 { AV_386_CX8, "CX8" }, 1162 { AV_386_SEP, "SEP" }, 1163 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1164 { AV_386_CMOV, "CMOV" }, 1165 { AV_386_MMX, "MMX" }, 1166 { AV_386_AMD_MMX, "AMD_MMX" }, 1167 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1168 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1169 { AV_386_FXSR, "FXSR" }, 1170 { AV_386_SSE, "SSE" }, 1171 { AV_386_SSE2, "SSE2" }, 1172 { AV_386_PAUSE, "PAUSE" }, 1173 { AV_386_SSE3, "SSE3" }, 1174 { AV_386_MON, "MON" }, 1175 { AV_386_CX16, "CX16" }, 1176 { AV_386_AHF, "AHF" }, 1177 { AV_386_TSCP, "TSCP" }, 1178 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1179 { AV_386_POPCNT, "POPCNT" }, 1180 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1181 { AV_386_SSSE3, "SSSE3" }, 1182 { AV_386_SSE4_1, "SSE4.1" }, 1183 { AV_386_SSE4_2, "SSE4.2" }, 1184 { 0, NULL } 1185 }; 1186 1187 private int 1188 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1189 size_t size, off_t fsize, int mach, int strtab, int *flags, 1190 uint16_t *notecount) 1191 { 1192 Elf32_Shdr sh32; 1193 Elf64_Shdr sh64; 1194 int stripped = 1, has_debug_info = 0; 1195 size_t nbadcap = 0; 1196 void *nbuf; 1197 off_t noff, coff, name_off; 1198 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */ 1199 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */ 1200 char name[50]; 1201 ssize_t namesize; 1202 1203 if (size != xsh_sizeof) { 1204 if (file_printf(ms, ", corrupted section header size") == -1) 1205 return -1; 1206 return 0; 1207 } 1208 1209 /* Read offset of name section to be able to read section names later */ 1210 if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab))) 1211 < (ssize_t)xsh_sizeof) { 1212 if (file_printf(ms, ", missing section headers") == -1) 1213 return -1; 1214 return 0; 1215 } 1216 name_off = xsh_offset; 1217 1218 for ( ; num; num--) { 1219 /* Read the name of this section. */ 1220 if ((namesize = pread(fd, name, sizeof(name) - 1, name_off + xsh_name)) == -1) { 1221 file_badread(ms); 1222 return -1; 1223 } 1224 name[namesize] = '\0'; 1225 if (strcmp(name, ".debug_info") == 0) { 1226 has_debug_info = 1; 1227 stripped = 0; 1228 } 1229 1230 if (pread(fd, xsh_addr, xsh_sizeof, off) < (ssize_t)xsh_sizeof) { 1231 file_badread(ms); 1232 return -1; 1233 } 1234 off += size; 1235 1236 /* Things we can determine before we seek */ 1237 switch (xsh_type) { 1238 case SHT_SYMTAB: 1239 #if 0 1240 case SHT_DYNSYM: 1241 #endif 1242 stripped = 0; 1243 break; 1244 default: 1245 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1246 /* Perhaps warn here */ 1247 continue; 1248 } 1249 break; 1250 } 1251 1252 1253 /* Things we can determine when we seek */ 1254 switch (xsh_type) { 1255 case SHT_NOTE: 1256 if ((uintmax_t)(xsh_size + xsh_offset) > 1257 (uintmax_t)fsize) { 1258 if (file_printf(ms, 1259 ", note offset/size 0x%" INTMAX_T_FORMAT 1260 "x+0x%" INTMAX_T_FORMAT "x exceeds" 1261 " file size 0x%" INTMAX_T_FORMAT "x", 1262 (uintmax_t)xsh_offset, (uintmax_t)xsh_size, 1263 (uintmax_t)fsize) == -1) 1264 return -1; 1265 return 0; 1266 } 1267 if ((nbuf = malloc(xsh_size)) == NULL) { 1268 file_error(ms, errno, "Cannot allocate memory" 1269 " for note"); 1270 return -1; 1271 } 1272 if (pread(fd, nbuf, xsh_size, xsh_offset) < 1273 (ssize_t)xsh_size) { 1274 file_badread(ms); 1275 free(nbuf); 1276 return -1; 1277 } 1278 1279 noff = 0; 1280 for (;;) { 1281 if (noff >= (off_t)xsh_size) 1282 break; 1283 noff = donote(ms, nbuf, (size_t)noff, 1284 xsh_size, clazz, swap, 4, flags, notecount, 1285 fd, 0, 0, 0); 1286 if (noff == 0) 1287 break; 1288 } 1289 free(nbuf); 1290 break; 1291 case SHT_SUNW_cap: 1292 switch (mach) { 1293 case EM_SPARC: 1294 case EM_SPARCV9: 1295 case EM_IA_64: 1296 case EM_386: 1297 case EM_AMD64: 1298 break; 1299 default: 1300 goto skip; 1301 } 1302 1303 if (nbadcap > 5) 1304 break; 1305 if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) { 1306 file_badseek(ms); 1307 return -1; 1308 } 1309 coff = 0; 1310 for (;;) { 1311 Elf32_Cap cap32; 1312 Elf64_Cap cap64; 1313 char cbuf[/*CONSTCOND*/ 1314 MAX(sizeof cap32, sizeof cap64)]; 1315 if ((coff += xcap_sizeof) > (off_t)xsh_size) 1316 break; 1317 if (read(fd, cbuf, (size_t)xcap_sizeof) != 1318 (ssize_t)xcap_sizeof) { 1319 file_badread(ms); 1320 return -1; 1321 } 1322 if (cbuf[0] == 'A') { 1323 #ifdef notyet 1324 char *p = cbuf + 1; 1325 uint32_t len, tag; 1326 memcpy(&len, p, sizeof(len)); 1327 p += 4; 1328 len = getu32(swap, len); 1329 if (memcmp("gnu", p, 3) != 0) { 1330 if (file_printf(ms, 1331 ", unknown capability %.3s", p) 1332 == -1) 1333 return -1; 1334 break; 1335 } 1336 p += strlen(p) + 1; 1337 tag = *p++; 1338 memcpy(&len, p, sizeof(len)); 1339 p += 4; 1340 len = getu32(swap, len); 1341 if (tag != 1) { 1342 if (file_printf(ms, ", unknown gnu" 1343 " capability tag %d", tag) 1344 == -1) 1345 return -1; 1346 break; 1347 } 1348 // gnu attributes 1349 #endif 1350 break; 1351 } 1352 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 1353 switch (xcap_tag) { 1354 case CA_SUNW_NULL: 1355 break; 1356 case CA_SUNW_HW_1: 1357 cap_hw1 |= xcap_val; 1358 break; 1359 case CA_SUNW_SF_1: 1360 cap_sf1 |= xcap_val; 1361 break; 1362 default: 1363 if (file_printf(ms, 1364 ", with unknown capability " 1365 "0x%" INT64_T_FORMAT "x = 0x%" 1366 INT64_T_FORMAT "x", 1367 (unsigned long long)xcap_tag, 1368 (unsigned long long)xcap_val) == -1) 1369 return -1; 1370 if (nbadcap++ > 2) 1371 coff = xsh_size; 1372 break; 1373 } 1374 } 1375 /*FALLTHROUGH*/ 1376 skip: 1377 default: 1378 break; 1379 } 1380 } 1381 1382 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1383 return -1; 1384 if (has_debug_info) { 1385 if (file_printf(ms, ", with debug_info") == -1) 1386 return -1; 1387 } 1388 if (cap_hw1) { 1389 const cap_desc_t *cdp; 1390 switch (mach) { 1391 case EM_SPARC: 1392 case EM_SPARC32PLUS: 1393 case EM_SPARCV9: 1394 cdp = cap_desc_sparc; 1395 break; 1396 case EM_386: 1397 case EM_IA_64: 1398 case EM_AMD64: 1399 cdp = cap_desc_386; 1400 break; 1401 default: 1402 cdp = NULL; 1403 break; 1404 } 1405 if (file_printf(ms, ", uses") == -1) 1406 return -1; 1407 if (cdp) { 1408 while (cdp->cd_name) { 1409 if (cap_hw1 & cdp->cd_mask) { 1410 if (file_printf(ms, 1411 " %s", cdp->cd_name) == -1) 1412 return -1; 1413 cap_hw1 &= ~cdp->cd_mask; 1414 } 1415 ++cdp; 1416 } 1417 if (cap_hw1) 1418 if (file_printf(ms, 1419 " unknown hardware capability 0x%" 1420 INT64_T_FORMAT "x", 1421 (unsigned long long)cap_hw1) == -1) 1422 return -1; 1423 } else { 1424 if (file_printf(ms, 1425 " hardware capability 0x%" INT64_T_FORMAT "x", 1426 (unsigned long long)cap_hw1) == -1) 1427 return -1; 1428 } 1429 } 1430 if (cap_sf1) { 1431 if (cap_sf1 & SF1_SUNW_FPUSED) { 1432 if (file_printf(ms, 1433 (cap_sf1 & SF1_SUNW_FPKNWN) 1434 ? ", uses frame pointer" 1435 : ", not known to use frame pointer") == -1) 1436 return -1; 1437 } 1438 cap_sf1 &= ~SF1_SUNW_MASK; 1439 if (cap_sf1) 1440 if (file_printf(ms, 1441 ", with unknown software capability 0x%" 1442 INT64_T_FORMAT "x", 1443 (unsigned long long)cap_sf1) == -1) 1444 return -1; 1445 } 1446 return 0; 1447 } 1448 1449 /* 1450 * Look through the program headers of an executable image, searching 1451 * for a PT_INTERP section; if one is found, it's dynamically linked, 1452 * otherwise it's statically linked. 1453 */ 1454 private int 1455 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1456 int num, size_t size, off_t fsize, int sh_num, int *flags, 1457 uint16_t *notecount) 1458 { 1459 Elf32_Phdr ph32; 1460 Elf64_Phdr ph64; 1461 const char *linking_style = "statically"; 1462 const char *interp = ""; 1463 unsigned char nbuf[BUFSIZ]; 1464 char ibuf[BUFSIZ]; 1465 ssize_t bufsize; 1466 size_t offset, align, len; 1467 1468 if (size != xph_sizeof) { 1469 if (file_printf(ms, ", corrupted program header size") == -1) 1470 return -1; 1471 return 0; 1472 } 1473 1474 for ( ; num; num--) { 1475 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 1476 file_badread(ms); 1477 return -1; 1478 } 1479 1480 off += size; 1481 bufsize = 0; 1482 align = 4; 1483 1484 /* Things we can determine before we seek */ 1485 switch (xph_type) { 1486 case PT_DYNAMIC: 1487 linking_style = "dynamically"; 1488 break; 1489 case PT_NOTE: 1490 if (sh_num) /* Did this through section headers */ 1491 continue; 1492 if (((align = xph_align) & 0x80000000UL) != 0 || 1493 align < 4) { 1494 if (file_printf(ms, 1495 ", invalid note alignment 0x%lx", 1496 (unsigned long)align) == -1) 1497 return -1; 1498 align = 4; 1499 } 1500 /*FALLTHROUGH*/ 1501 case PT_INTERP: 1502 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1503 : sizeof(nbuf); 1504 bufsize = pread(fd, nbuf, len, xph_offset); 1505 if (bufsize == -1) { 1506 file_badread(ms); 1507 return -1; 1508 } 1509 break; 1510 default: 1511 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1512 /* Maybe warn here? */ 1513 continue; 1514 } 1515 break; 1516 } 1517 1518 /* Things we can determine when we seek */ 1519 switch (xph_type) { 1520 case PT_INTERP: 1521 if (bufsize && nbuf[0]) { 1522 nbuf[bufsize - 1] = '\0'; 1523 interp = (const char *)nbuf; 1524 } else 1525 interp = "*empty*"; 1526 break; 1527 case PT_NOTE: 1528 /* 1529 * This is a PT_NOTE section; loop through all the notes 1530 * in the section. 1531 */ 1532 offset = 0; 1533 for (;;) { 1534 if (offset >= (size_t)bufsize) 1535 break; 1536 offset = donote(ms, nbuf, offset, 1537 (size_t)bufsize, clazz, swap, align, 1538 flags, notecount, fd, 0, 0, 0); 1539 if (offset == 0) 1540 break; 1541 } 1542 break; 1543 default: 1544 break; 1545 } 1546 } 1547 if (file_printf(ms, ", %s linked", linking_style) 1548 == -1) 1549 return -1; 1550 if (interp[0]) 1551 if (file_printf(ms, ", interpreter %s", 1552 file_printable(ibuf, sizeof(ibuf), interp)) == -1) 1553 return -1; 1554 return 0; 1555 } 1556 1557 1558 protected int 1559 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, 1560 size_t nbytes) 1561 { 1562 union { 1563 int32_t l; 1564 char c[sizeof (int32_t)]; 1565 } u; 1566 int clazz; 1567 int swap; 1568 struct stat st; 1569 off_t fsize; 1570 int flags = 0; 1571 Elf32_Ehdr elf32hdr; 1572 Elf64_Ehdr elf64hdr; 1573 uint16_t type, phnum, shnum, notecount; 1574 1575 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION)) 1576 return 0; 1577 /* 1578 * ELF executables have multiple section headers in arbitrary 1579 * file locations and thus file(1) cannot determine it from easily. 1580 * Instead we traverse thru all section headers until a symbol table 1581 * one is found or else the binary is stripped. 1582 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1583 */ 1584 if (buf[EI_MAG0] != ELFMAG0 1585 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1586 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1587 return 0; 1588 1589 /* 1590 * If we cannot seek, it must be a pipe, socket or fifo. 1591 */ 1592 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1593 fd = file_pipe2file(ms, fd, buf, nbytes); 1594 1595 if (fstat(fd, &st) == -1) { 1596 file_badread(ms); 1597 return -1; 1598 } 1599 if (S_ISREG(st.st_mode) || st.st_size != 0) 1600 fsize = st.st_size; 1601 else 1602 fsize = SIZE_UNKNOWN; 1603 1604 clazz = buf[EI_CLASS]; 1605 1606 switch (clazz) { 1607 case ELFCLASS32: 1608 #undef elf_getu 1609 #define elf_getu(a, b) elf_getu32(a, b) 1610 #undef elfhdr 1611 #define elfhdr elf32hdr 1612 #include "elfclass.h" 1613 case ELFCLASS64: 1614 #undef elf_getu 1615 #define elf_getu(a, b) elf_getu64(a, b) 1616 #undef elfhdr 1617 #define elfhdr elf64hdr 1618 #include "elfclass.h" 1619 default: 1620 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1621 return -1; 1622 break; 1623 } 1624 return 0; 1625 } 1626 #endif 1627