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