1 /* $NetBSD: readelf.c,v 1.17 2018/04/15 19:45:32 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 1.141 2018/04/12 16:50:52 christos Exp $") 34 #else 35 __RCSID("$NetBSD: readelf.c,v 1.17 2018/04/15 19:45:32 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 0x0003 320 321 #define FLAGS_DID_CORE 0x0004 322 #define FLAGS_DID_OS_NOTE 0x0008 323 #define FLAGS_DID_BUILD_ID 0x0010 324 #define FLAGS_DID_CORE_STYLE 0x0020 325 #define FLAGS_DID_NETBSD_PAX 0x0040 326 #define FLAGS_DID_NETBSD_MARCH 0x0080 327 #define FLAGS_DID_NETBSD_CMODEL 0x0100 328 #define FLAGS_DID_NETBSD_EMULATION 0x0200 329 #define FLAGS_DID_NETBSD_UNKNOWN 0x0400 330 #define FLAGS_IS_CORE 0x0800 331 #define FLAGS_DID_AUXV 0x1000 332 333 private int 334 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 335 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 336 { 337 Elf32_Phdr ph32; 338 Elf64_Phdr ph64; 339 size_t offset, len; 340 unsigned char nbuf[BUFSIZ]; 341 ssize_t bufsize; 342 off_t ph_off = off; 343 int ph_num = num; 344 345 if (size != xph_sizeof) { 346 if (file_printf(ms, ", corrupted program header size") == -1) 347 return -1; 348 return 0; 349 } 350 351 /* 352 * Loop through all the program headers. 353 */ 354 for ( ; num; num--) { 355 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 356 file_badread(ms); 357 return -1; 358 } 359 off += size; 360 361 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 362 /* Perhaps warn here */ 363 continue; 364 } 365 366 if (xph_type != PT_NOTE) 367 continue; 368 369 /* 370 * This is a PT_NOTE section; loop through all the notes 371 * in the section. 372 */ 373 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 374 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) { 375 file_badread(ms); 376 return -1; 377 } 378 offset = 0; 379 for (;;) { 380 if (offset >= (size_t)bufsize) 381 break; 382 offset = donote(ms, nbuf, offset, (size_t)bufsize, 383 clazz, swap, 4, flags, notecount, fd, ph_off, 384 ph_num, fsize); 385 if (offset == 0) 386 break; 387 388 } 389 } 390 return 0; 391 } 392 #endif 393 394 static void 395 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 396 { 397 uint32_t desc; 398 (void)memcpy(&desc, v, sizeof(desc)); 399 desc = elf_getu32(swap, desc); 400 401 if (file_printf(ms, ", for NetBSD") == -1) 402 return; 403 /* 404 * The version number used to be stuck as 199905, and was thus 405 * basically content-free. Newer versions of NetBSD have fixed 406 * this and now use the encoding of __NetBSD_Version__: 407 * 408 * MMmmrrpp00 409 * 410 * M = major version 411 * m = minor version 412 * r = release ["",A-Z,Z[A-Z] but numeric] 413 * p = patchlevel 414 */ 415 if (desc > 100000000U) { 416 uint32_t ver_patch = (desc / 100) % 100; 417 uint32_t ver_rel = (desc / 10000) % 100; 418 uint32_t ver_min = (desc / 1000000) % 100; 419 uint32_t ver_maj = desc / 100000000; 420 421 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 422 return; 423 if (ver_rel == 0 && ver_patch != 0) { 424 if (file_printf(ms, ".%u", ver_patch) == -1) 425 return; 426 } else if (ver_rel != 0) { 427 while (ver_rel > 26) { 428 if (file_printf(ms, "Z") == -1) 429 return; 430 ver_rel -= 26; 431 } 432 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 433 == -1) 434 return; 435 } 436 } 437 } 438 439 static void 440 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 441 { 442 uint32_t desc; 443 444 (void)memcpy(&desc, v, sizeof(desc)); 445 desc = elf_getu32(swap, desc); 446 if (file_printf(ms, ", for FreeBSD") == -1) 447 return; 448 449 /* 450 * Contents is __FreeBSD_version, whose relation to OS 451 * versions is defined by a huge table in the Porter's 452 * Handbook. This is the general scheme: 453 * 454 * Releases: 455 * Mmp000 (before 4.10) 456 * Mmi0p0 (before 5.0) 457 * Mmm0p0 458 * 459 * Development branches: 460 * Mmpxxx (before 4.6) 461 * Mmp1xx (before 4.10) 462 * Mmi1xx (before 5.0) 463 * M000xx (pre-M.0) 464 * Mmm1xx 465 * 466 * M = major version 467 * m = minor version 468 * i = minor version increment (491000 -> 4.10) 469 * p = patchlevel 470 * x = revision 471 * 472 * The first release of FreeBSD to use ELF by default 473 * was version 3.0. 474 */ 475 if (desc == 460002) { 476 if (file_printf(ms, " 4.6.2") == -1) 477 return; 478 } else if (desc < 460100) { 479 if (file_printf(ms, " %d.%d", desc / 100000, 480 desc / 10000 % 10) == -1) 481 return; 482 if (desc / 1000 % 10 > 0) 483 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 484 return; 485 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 486 if (file_printf(ms, " (%d)", desc) == -1) 487 return; 488 } else if (desc < 500000) { 489 if (file_printf(ms, " %d.%d", desc / 100000, 490 desc / 10000 % 10 + desc / 1000 % 10) == -1) 491 return; 492 if (desc / 100 % 10 > 0) { 493 if (file_printf(ms, " (%d)", desc) == -1) 494 return; 495 } else if (desc / 10 % 10 > 0) { 496 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 497 return; 498 } 499 } else { 500 if (file_printf(ms, " %d.%d", desc / 100000, 501 desc / 1000 % 100) == -1) 502 return; 503 if ((desc / 100 % 10 > 0) || 504 (desc % 100000 / 100 == 0)) { 505 if (file_printf(ms, " (%d)", desc) == -1) 506 return; 507 } else if (desc / 10 % 10 > 0) { 508 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 509 return; 510 } 511 } 512 } 513 514 private int 515 /*ARGSUSED*/ 516 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 517 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 518 size_t noff, size_t doff, int *flags) 519 { 520 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 521 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) { 522 uint8_t desc[20]; 523 const char *btype; 524 uint32_t i; 525 *flags |= FLAGS_DID_BUILD_ID; 526 switch (descsz) { 527 case 8: 528 btype = "xxHash"; 529 break; 530 case 16: 531 btype = "md5/uuid"; 532 break; 533 case 20: 534 btype = "sha1"; 535 break; 536 default: 537 btype = "unknown"; 538 break; 539 } 540 if (file_printf(ms, ", BuildID[%s]=", btype) == -1) 541 return 1; 542 (void)memcpy(desc, &nbuf[doff], descsz); 543 for (i = 0; i < descsz; i++) 544 if (file_printf(ms, "%02x", desc[i]) == -1) 545 return 1; 546 return 1; 547 } 548 return 0; 549 } 550 551 private int 552 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 553 int swap, uint32_t namesz, uint32_t descsz, 554 size_t noff, size_t doff, int *flags) 555 { 556 if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 && 557 type == NT_GNU_VERSION && descsz == 2) { 558 *flags |= FLAGS_DID_OS_NOTE; 559 file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]); 560 return 1; 561 } 562 563 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && 564 type == NT_GNU_VERSION && descsz == 16) { 565 uint32_t desc[4]; 566 (void)memcpy(desc, &nbuf[doff], sizeof(desc)); 567 568 *flags |= FLAGS_DID_OS_NOTE; 569 if (file_printf(ms, ", for GNU/") == -1) 570 return 1; 571 switch (elf_getu32(swap, desc[0])) { 572 case GNU_OS_LINUX: 573 if (file_printf(ms, "Linux") == -1) 574 return 1; 575 break; 576 case GNU_OS_HURD: 577 if (file_printf(ms, "Hurd") == -1) 578 return 1; 579 break; 580 case GNU_OS_SOLARIS: 581 if (file_printf(ms, "Solaris") == -1) 582 return 1; 583 break; 584 case GNU_OS_KFREEBSD: 585 if (file_printf(ms, "kFreeBSD") == -1) 586 return 1; 587 break; 588 case GNU_OS_KNETBSD: 589 if (file_printf(ms, "kNetBSD") == -1) 590 return 1; 591 break; 592 default: 593 if (file_printf(ms, "<unknown>") == -1) 594 return 1; 595 } 596 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 597 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 598 return 1; 599 return 1; 600 } 601 602 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 603 if (type == NT_NETBSD_VERSION && descsz == 4) { 604 *flags |= FLAGS_DID_OS_NOTE; 605 do_note_netbsd_version(ms, swap, &nbuf[doff]); 606 return 1; 607 } 608 } 609 610 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) { 611 if (type == NT_FREEBSD_VERSION && descsz == 4) { 612 *flags |= FLAGS_DID_OS_NOTE; 613 do_note_freebsd_version(ms, swap, &nbuf[doff]); 614 return 1; 615 } 616 } 617 618 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && 619 type == NT_OPENBSD_VERSION && descsz == 4) { 620 *flags |= FLAGS_DID_OS_NOTE; 621 if (file_printf(ms, ", for OpenBSD") == -1) 622 return 1; 623 /* Content of note is always 0 */ 624 return 1; 625 } 626 627 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && 628 type == NT_DRAGONFLY_VERSION && descsz == 4) { 629 uint32_t desc; 630 *flags |= FLAGS_DID_OS_NOTE; 631 if (file_printf(ms, ", for DragonFly") == -1) 632 return 1; 633 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 634 desc = elf_getu32(swap, desc); 635 if (file_printf(ms, " %d.%d.%d", desc / 100000, 636 desc / 10000 % 10, desc % 10000) == -1) 637 return 1; 638 return 1; 639 } 640 return 0; 641 } 642 643 private int 644 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 645 int swap, uint32_t namesz, uint32_t descsz, 646 size_t noff, size_t doff, int *flags) 647 { 648 if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 && 649 type == NT_NETBSD_PAX && descsz == 4) { 650 static const char *pax[] = { 651 "+mprotect", 652 "-mprotect", 653 "+segvguard", 654 "-segvguard", 655 "+ASLR", 656 "-ASLR", 657 }; 658 uint32_t desc; 659 size_t i; 660 int did = 0; 661 662 *flags |= FLAGS_DID_NETBSD_PAX; 663 (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); 664 desc = elf_getu32(swap, desc); 665 666 if (desc && file_printf(ms, ", PaX: ") == -1) 667 return 1; 668 669 for (i = 0; i < __arraycount(pax); i++) { 670 if (((1 << (int)i) & desc) == 0) 671 continue; 672 if (file_printf(ms, "%s%s", did++ ? "," : "", 673 pax[i]) == -1) 674 return 1; 675 } 676 return 1; 677 } 678 return 0; 679 } 680 681 private int 682 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 683 int swap, uint32_t namesz, uint32_t descsz, 684 size_t noff, size_t doff, int *flags, size_t size, int clazz) 685 { 686 #ifdef ELFCORE 687 int os_style = -1; 688 /* 689 * Sigh. The 2.0.36 kernel in Debian 2.1, at 690 * least, doesn't correctly implement name 691 * sections, in core dumps, as specified by 692 * the "Program Linking" section of "UNIX(R) System 693 * V Release 4 Programmer's Guide: ANSI C and 694 * Programming Support Tools", because my copy 695 * clearly says "The first 'namesz' bytes in 'name' 696 * contain a *null-terminated* [emphasis mine] 697 * character representation of the entry's owner 698 * or originator", but the 2.0.36 kernel code 699 * doesn't include the terminating null in the 700 * name.... 701 */ 702 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || 703 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { 704 os_style = OS_STYLE_SVR4; 705 } 706 707 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { 708 os_style = OS_STYLE_FREEBSD; 709 } 710 711 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) 712 == 0)) { 713 os_style = OS_STYLE_NETBSD; 714 } 715 716 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 717 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 718 == -1) 719 return 1; 720 *flags |= FLAGS_DID_CORE_STYLE; 721 *flags |= os_style; 722 } 723 724 switch (os_style) { 725 case OS_STYLE_NETBSD: 726 if (type == NT_NETBSD_CORE_PROCINFO) { 727 char sbuf[512]; 728 struct NetBSD_elfcore_procinfo pi; 729 memset(&pi, 0, sizeof(pi)); 730 memcpy(&pi, nbuf + doff, descsz); 731 732 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, " 733 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)", 734 file_printable(sbuf, sizeof(sbuf), 735 CAST(char *, pi.cpi_name)), 736 elf_getu32(swap, (uint32_t)pi.cpi_pid), 737 elf_getu32(swap, pi.cpi_euid), 738 elf_getu32(swap, pi.cpi_egid), 739 elf_getu32(swap, pi.cpi_nlwps), 740 elf_getu32(swap, (uint32_t)pi.cpi_siglwp), 741 elf_getu32(swap, pi.cpi_signo), 742 elf_getu32(swap, pi.cpi_sigcode)) == -1) 743 return 1; 744 745 *flags |= FLAGS_DID_CORE; 746 return 1; 747 } 748 break; 749 750 default: 751 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 752 size_t i, j; 753 unsigned char c; 754 /* 755 * Extract the program name. We assume 756 * it to be 16 characters (that's what it 757 * is in SunOS 5.x and Linux). 758 * 759 * Unfortunately, it's at a different offset 760 * in various OSes, so try multiple offsets. 761 * If the characters aren't all printable, 762 * reject it. 763 */ 764 for (i = 0; i < NOFFSETS; i++) { 765 unsigned char *cname, *cp; 766 size_t reloffset = prpsoffsets(i); 767 size_t noffset = doff + reloffset; 768 size_t k; 769 for (j = 0; j < 16; j++, noffset++, 770 reloffset++) { 771 /* 772 * Make sure we're not past 773 * the end of the buffer; if 774 * we are, just give up. 775 */ 776 if (noffset >= size) 777 goto tryanother; 778 779 /* 780 * Make sure we're not past 781 * the end of the contents; 782 * if we are, this obviously 783 * isn't the right offset. 784 */ 785 if (reloffset >= descsz) 786 goto tryanother; 787 788 c = nbuf[noffset]; 789 if (c == '\0') { 790 /* 791 * A '\0' at the 792 * beginning is 793 * obviously wrong. 794 * Any other '\0' 795 * means we're done. 796 */ 797 if (j == 0) 798 goto tryanother; 799 else 800 break; 801 } else { 802 /* 803 * A nonprintable 804 * character is also 805 * wrong. 806 */ 807 if (!isprint(c) || isquote(c)) 808 goto tryanother; 809 } 810 } 811 /* 812 * Well, that worked. 813 */ 814 815 /* 816 * Try next offsets, in case this match is 817 * in the middle of a string. 818 */ 819 for (k = i + 1 ; k < NOFFSETS; k++) { 820 size_t no; 821 int adjust = 1; 822 if (prpsoffsets(k) >= prpsoffsets(i)) 823 continue; 824 for (no = doff + prpsoffsets(k); 825 no < doff + prpsoffsets(i); no++) 826 adjust = adjust 827 && isprint(nbuf[no]); 828 if (adjust) 829 i = k; 830 } 831 832 cname = (unsigned char *) 833 &nbuf[doff + prpsoffsets(i)]; 834 for (cp = cname; *cp && isprint(*cp); cp++) 835 continue; 836 /* 837 * Linux apparently appends a space at the end 838 * of the command line: remove it. 839 */ 840 while (cp > cname && isspace(cp[-1])) 841 cp--; 842 if (file_printf(ms, ", from '%.*s'", 843 (int)(cp - cname), cname) == -1) 844 return 1; 845 *flags |= FLAGS_DID_CORE; 846 return 1; 847 848 tryanother: 849 ; 850 } 851 } 852 break; 853 } 854 #endif 855 return 0; 856 } 857 858 private off_t 859 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, 860 off_t off, int num, off_t fsize, uint64_t virtaddr) 861 { 862 Elf32_Phdr ph32; 863 Elf64_Phdr ph64; 864 865 /* 866 * Loop through all the program headers and find the header with 867 * virtual address in which the "virtaddr" belongs to. 868 */ 869 for ( ; num; num--) { 870 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 871 file_badread(ms); 872 return -1; 873 } 874 off += xph_sizeof; 875 876 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 877 /* Perhaps warn here */ 878 continue; 879 } 880 881 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) 882 return xph_offset + (virtaddr - xph_vaddr); 883 } 884 return 0; 885 } 886 887 private size_t 888 get_string_on_virtaddr(struct magic_set *ms, 889 int swap, int clazz, int fd, off_t ph_off, int ph_num, 890 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) 891 { 892 char *bptr; 893 off_t offset; 894 895 if (buflen == 0) 896 return 0; 897 898 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, 899 fsize, virtaddr); 900 if ((buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) { 901 file_badread(ms); 902 return 0; 903 } 904 905 buf[buflen - 1] = '\0'; 906 907 /* We expect only printable characters, so return if buffer contains 908 * non-printable character before the '\0' or just '\0'. */ 909 for (bptr = buf; *bptr && isprint((unsigned char)*bptr); bptr++) 910 continue; 911 if (*bptr != '\0') 912 return 0; 913 914 return bptr - buf; 915 } 916 917 918 /*ARGSUSED*/ 919 private int 920 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 921 int swap, uint32_t namesz __attribute__((__unused__)), 922 uint32_t descsz __attribute__((__unused__)), 923 size_t noff __attribute__((__unused__)), size_t doff, 924 int *flags, size_t size __attribute__((__unused__)), int clazz, 925 int fd, off_t ph_off, int ph_num, off_t fsize) 926 { 927 #ifdef ELFCORE 928 Aux32Info auxv32; 929 Aux64Info auxv64; 930 size_t elsize = xauxv_sizeof; 931 const char *tag; 932 int is_string; 933 size_t nval; 934 935 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != 936 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) 937 return 0; 938 939 switch (*flags & FLAGS_CORE_STYLE) { 940 case OS_STYLE_SVR4: 941 if (type != NT_AUXV) 942 return 0; 943 break; 944 #ifdef notyet 945 case OS_STYLE_NETBSD: 946 if (type != NT_NETBSD_CORE_AUXV) 947 return 0; 948 break; 949 case OS_STYLE_FREEBSD: 950 if (type != NT_FREEBSD_PROCSTAT_AUXV) 951 return 0; 952 break; 953 #endif 954 default: 955 return 0; 956 } 957 958 *flags |= FLAGS_DID_AUXV; 959 960 nval = 0; 961 for (size_t off = 0; off + elsize <= descsz; off += elsize) { 962 (void)memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 963 /* Limit processing to 50 vector entries to prevent DoS */ 964 if (nval++ >= 50) { 965 file_error(ms, 0, "Too many ELF Auxv elements"); 966 return 1; 967 } 968 969 switch(xauxv_type) { 970 case AT_LINUX_EXECFN: 971 is_string = 1; 972 tag = "execfn"; 973 break; 974 case AT_LINUX_PLATFORM: 975 is_string = 1; 976 tag = "platform"; 977 break; 978 case AT_LINUX_UID: 979 is_string = 0; 980 tag = "real uid"; 981 break; 982 case AT_LINUX_GID: 983 is_string = 0; 984 tag = "real gid"; 985 break; 986 case AT_LINUX_EUID: 987 is_string = 0; 988 tag = "effective uid"; 989 break; 990 case AT_LINUX_EGID: 991 is_string = 0; 992 tag = "effective gid"; 993 break; 994 default: 995 is_string = 0; 996 tag = NULL; 997 break; 998 } 999 1000 if (tag == NULL) 1001 continue; 1002 1003 if (is_string) { 1004 char buf[256]; 1005 ssize_t buflen; 1006 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 1007 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 1008 1009 if (buflen == 0) 1010 continue; 1011 1012 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 1013 return 0; 1014 } else { 1015 if (file_printf(ms, ", %s: %d", tag, (int) xauxv_val) 1016 == -1) 1017 return 0; 1018 } 1019 } 1020 return 1; 1021 #else 1022 return 0; 1023 #endif 1024 } 1025 1026 private size_t 1027 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1028 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1029 int fd, off_t ph_off, int ph_num, off_t fsize) 1030 { 1031 Elf32_Nhdr nh32; 1032 Elf64_Nhdr nh64; 1033 size_t noff, doff; 1034 uint32_t namesz, descsz; 1035 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1036 1037 if (*notecount == 0) 1038 return 0; 1039 --*notecount; 1040 1041 if (xnh_sizeof + offset > size) { 1042 /* 1043 * We're out of note headers. 1044 */ 1045 return xnh_sizeof + offset; 1046 } 1047 1048 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1049 offset += xnh_sizeof; 1050 1051 namesz = xnh_namesz; 1052 descsz = xnh_descsz; 1053 1054 if ((namesz == 0) && (descsz == 0)) { 1055 /* 1056 * We're out of note headers. 1057 */ 1058 return (offset >= size) ? offset : size; 1059 } 1060 1061 if (namesz & 0x80000000) { 1062 (void)file_printf(ms, ", bad note name size %#lx", 1063 (unsigned long)namesz); 1064 return 0; 1065 } 1066 1067 if (descsz & 0x80000000) { 1068 (void)file_printf(ms, ", bad note description size %#lx", 1069 (unsigned long)descsz); 1070 return 0; 1071 } 1072 1073 noff = offset; 1074 doff = ELF_ALIGN(offset + namesz); 1075 1076 if (offset + namesz > size) { 1077 /* 1078 * We're past the end of the buffer. 1079 */ 1080 return doff; 1081 } 1082 1083 offset = ELF_ALIGN(doff + descsz); 1084 if (doff + descsz > size) { 1085 /* 1086 * We're past the end of the buffer. 1087 */ 1088 return (offset >= size) ? offset : size; 1089 } 1090 1091 1092 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1093 if (do_os_note(ms, nbuf, xnh_type, swap, 1094 namesz, descsz, noff, doff, flags)) 1095 return offset; 1096 } 1097 1098 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1099 if (do_bid_note(ms, nbuf, xnh_type, swap, 1100 namesz, descsz, noff, doff, flags)) 1101 return offset; 1102 } 1103 1104 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1105 if (do_pax_note(ms, nbuf, xnh_type, swap, 1106 namesz, descsz, noff, doff, flags)) 1107 return offset; 1108 } 1109 1110 if ((*flags & FLAGS_DID_CORE) == 0) { 1111 if (do_core_note(ms, nbuf, xnh_type, swap, 1112 namesz, descsz, noff, doff, flags, size, clazz)) 1113 return offset; 1114 } 1115 1116 if ((*flags & FLAGS_DID_AUXV) == 0) { 1117 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1118 namesz, descsz, noff, doff, flags, size, clazz, 1119 fd, ph_off, ph_num, fsize)) 1120 return offset; 1121 } 1122 1123 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) { 1124 if (descsz > 100) 1125 descsz = 100; 1126 switch (xnh_type) { 1127 case NT_NETBSD_VERSION: 1128 return offset; 1129 case NT_NETBSD_MARCH: 1130 if (*flags & FLAGS_DID_NETBSD_MARCH) 1131 return offset; 1132 *flags |= FLAGS_DID_NETBSD_MARCH; 1133 if (file_printf(ms, ", compiled for: %.*s", 1134 (int)descsz, (const char *)&nbuf[doff]) == -1) 1135 return offset; 1136 break; 1137 case NT_NETBSD_CMODEL: 1138 if (*flags & FLAGS_DID_NETBSD_CMODEL) 1139 return offset; 1140 *flags |= FLAGS_DID_NETBSD_CMODEL; 1141 if (file_printf(ms, ", compiler model: %.*s", 1142 (int)descsz, (const char *)&nbuf[doff]) == -1) 1143 return offset; 1144 break; 1145 case NT_NETBSD_EMULATION: 1146 if (*flags & FLAGS_DID_NETBSD_EMULATION) 1147 return offset; 1148 *flags |= FLAGS_DID_NETBSD_EMULATION; 1149 if (file_printf(ms, ", emulation: %.*s", 1150 (int)descsz, (const char *)&nbuf[doff]) == -1) 1151 return offset; 1152 break; 1153 default: 1154 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1155 return offset; 1156 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1157 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1158 return offset; 1159 break; 1160 } 1161 return offset; 1162 } 1163 1164 return offset; 1165 } 1166 1167 /* SunOS 5.x hardware capability descriptions */ 1168 typedef struct cap_desc { 1169 uint64_t cd_mask; 1170 const char *cd_name; 1171 } cap_desc_t; 1172 1173 static const cap_desc_t cap_desc_sparc[] = { 1174 { AV_SPARC_MUL32, "MUL32" }, 1175 { AV_SPARC_DIV32, "DIV32" }, 1176 { AV_SPARC_FSMULD, "FSMULD" }, 1177 { AV_SPARC_V8PLUS, "V8PLUS" }, 1178 { AV_SPARC_POPC, "POPC" }, 1179 { AV_SPARC_VIS, "VIS" }, 1180 { AV_SPARC_VIS2, "VIS2" }, 1181 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1182 { AV_SPARC_FMAF, "FMAF" }, 1183 { AV_SPARC_FJFMAU, "FJFMAU" }, 1184 { AV_SPARC_IMA, "IMA" }, 1185 { 0, NULL } 1186 }; 1187 1188 static const cap_desc_t cap_desc_386[] = { 1189 { AV_386_FPU, "FPU" }, 1190 { AV_386_TSC, "TSC" }, 1191 { AV_386_CX8, "CX8" }, 1192 { AV_386_SEP, "SEP" }, 1193 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1194 { AV_386_CMOV, "CMOV" }, 1195 { AV_386_MMX, "MMX" }, 1196 { AV_386_AMD_MMX, "AMD_MMX" }, 1197 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1198 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1199 { AV_386_FXSR, "FXSR" }, 1200 { AV_386_SSE, "SSE" }, 1201 { AV_386_SSE2, "SSE2" }, 1202 { AV_386_PAUSE, "PAUSE" }, 1203 { AV_386_SSE3, "SSE3" }, 1204 { AV_386_MON, "MON" }, 1205 { AV_386_CX16, "CX16" }, 1206 { AV_386_AHF, "AHF" }, 1207 { AV_386_TSCP, "TSCP" }, 1208 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1209 { AV_386_POPCNT, "POPCNT" }, 1210 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1211 { AV_386_SSSE3, "SSSE3" }, 1212 { AV_386_SSE4_1, "SSE4.1" }, 1213 { AV_386_SSE4_2, "SSE4.2" }, 1214 { 0, NULL } 1215 }; 1216 1217 private int 1218 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1219 size_t size, off_t fsize, int mach, int strtab, int *flags, 1220 uint16_t *notecount) 1221 { 1222 Elf32_Shdr sh32; 1223 Elf64_Shdr sh64; 1224 int stripped = 1, has_debug_info = 0; 1225 size_t nbadcap = 0; 1226 void *nbuf; 1227 off_t noff, coff, name_off; 1228 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ 1229 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ 1230 char name[50]; 1231 ssize_t namesize; 1232 1233 if (size != xsh_sizeof) { 1234 if (file_printf(ms, ", corrupted section header size") == -1) 1235 return -1; 1236 return 0; 1237 } 1238 1239 /* Read offset of name section to be able to read section names later */ 1240 if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab))) 1241 < (ssize_t)xsh_sizeof) { 1242 if (file_printf(ms, ", missing section headers") == -1) 1243 return -1; 1244 return 0; 1245 } 1246 name_off = xsh_offset; 1247 1248 for ( ; num; num--) { 1249 /* Read the name of this section. */ 1250 if ((namesize = pread(fd, name, sizeof(name) - 1, name_off + xsh_name)) == -1) { 1251 file_badread(ms); 1252 return -1; 1253 } 1254 name[namesize] = '\0'; 1255 if (strcmp(name, ".debug_info") == 0) { 1256 has_debug_info = 1; 1257 stripped = 0; 1258 } 1259 1260 if (pread(fd, xsh_addr, xsh_sizeof, off) < (ssize_t)xsh_sizeof) { 1261 file_badread(ms); 1262 return -1; 1263 } 1264 off += size; 1265 1266 /* Things we can determine before we seek */ 1267 switch (xsh_type) { 1268 case SHT_SYMTAB: 1269 #if 0 1270 case SHT_DYNSYM: 1271 #endif 1272 stripped = 0; 1273 break; 1274 default: 1275 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1276 /* Perhaps warn here */ 1277 continue; 1278 } 1279 break; 1280 } 1281 1282 1283 /* Things we can determine when we seek */ 1284 switch (xsh_type) { 1285 case SHT_NOTE: 1286 if ((uintmax_t)(xsh_size + xsh_offset) > 1287 (uintmax_t)fsize) { 1288 if (file_printf(ms, 1289 ", note offset/size %#" INTMAX_T_FORMAT 1290 "x+%#" INTMAX_T_FORMAT "x exceeds" 1291 " file size %#" INTMAX_T_FORMAT "x", 1292 (uintmax_t)xsh_offset, (uintmax_t)xsh_size, 1293 (uintmax_t)fsize) == -1) 1294 return -1; 1295 return 0; 1296 } 1297 if ((nbuf = malloc(xsh_size)) == NULL) { 1298 file_error(ms, errno, "Cannot allocate memory" 1299 " for note"); 1300 return -1; 1301 } 1302 if (pread(fd, nbuf, xsh_size, xsh_offset) < 1303 (ssize_t)xsh_size) { 1304 file_badread(ms); 1305 free(nbuf); 1306 return -1; 1307 } 1308 1309 noff = 0; 1310 for (;;) { 1311 if (noff >= (off_t)xsh_size) 1312 break; 1313 noff = donote(ms, nbuf, (size_t)noff, 1314 xsh_size, clazz, swap, 4, flags, notecount, 1315 fd, 0, 0, 0); 1316 if (noff == 0) 1317 break; 1318 } 1319 free(nbuf); 1320 break; 1321 case SHT_SUNW_cap: 1322 switch (mach) { 1323 case EM_SPARC: 1324 case EM_SPARCV9: 1325 case EM_IA_64: 1326 case EM_386: 1327 case EM_AMD64: 1328 break; 1329 default: 1330 goto skip; 1331 } 1332 1333 if (nbadcap > 5) 1334 break; 1335 if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) { 1336 file_badseek(ms); 1337 return -1; 1338 } 1339 coff = 0; 1340 for (;;) { 1341 Elf32_Cap cap32; 1342 Elf64_Cap cap64; 1343 char cbuf[/*CONSTCOND*/ 1344 MAX(sizeof cap32, sizeof cap64)]; 1345 if ((coff += xcap_sizeof) > (off_t)xsh_size) 1346 break; 1347 if (read(fd, cbuf, (size_t)xcap_sizeof) != 1348 (ssize_t)xcap_sizeof) { 1349 file_badread(ms); 1350 return -1; 1351 } 1352 if (cbuf[0] == 'A') { 1353 #ifdef notyet 1354 char *p = cbuf + 1; 1355 uint32_t len, tag; 1356 memcpy(&len, p, sizeof(len)); 1357 p += 4; 1358 len = getu32(swap, len); 1359 if (memcmp("gnu", p, 3) != 0) { 1360 if (file_printf(ms, 1361 ", unknown capability %.3s", p) 1362 == -1) 1363 return -1; 1364 break; 1365 } 1366 p += strlen(p) + 1; 1367 tag = *p++; 1368 memcpy(&len, p, sizeof(len)); 1369 p += 4; 1370 len = getu32(swap, len); 1371 if (tag != 1) { 1372 if (file_printf(ms, ", unknown gnu" 1373 " capability tag %d", tag) 1374 == -1) 1375 return -1; 1376 break; 1377 } 1378 // gnu attributes 1379 #endif 1380 break; 1381 } 1382 (void)memcpy(xcap_addr, cbuf, xcap_sizeof); 1383 switch (xcap_tag) { 1384 case CA_SUNW_NULL: 1385 break; 1386 case CA_SUNW_HW_1: 1387 cap_hw1 |= xcap_val; 1388 break; 1389 case CA_SUNW_SF_1: 1390 cap_sf1 |= xcap_val; 1391 break; 1392 default: 1393 if (file_printf(ms, 1394 ", with unknown capability " 1395 "%#" INT64_T_FORMAT "x = %#" 1396 INT64_T_FORMAT "x", 1397 (unsigned long long)xcap_tag, 1398 (unsigned long long)xcap_val) == -1) 1399 return -1; 1400 if (nbadcap++ > 2) 1401 coff = xsh_size; 1402 break; 1403 } 1404 } 1405 /*FALLTHROUGH*/ 1406 skip: 1407 default: 1408 break; 1409 } 1410 } 1411 1412 if (has_debug_info) { 1413 if (file_printf(ms, ", with debug_info") == -1) 1414 return -1; 1415 } 1416 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1417 return -1; 1418 if (cap_hw1) { 1419 const cap_desc_t *cdp; 1420 switch (mach) { 1421 case EM_SPARC: 1422 case EM_SPARC32PLUS: 1423 case EM_SPARCV9: 1424 cdp = cap_desc_sparc; 1425 break; 1426 case EM_386: 1427 case EM_IA_64: 1428 case EM_AMD64: 1429 cdp = cap_desc_386; 1430 break; 1431 default: 1432 cdp = NULL; 1433 break; 1434 } 1435 if (file_printf(ms, ", uses") == -1) 1436 return -1; 1437 if (cdp) { 1438 while (cdp->cd_name) { 1439 if (cap_hw1 & cdp->cd_mask) { 1440 if (file_printf(ms, 1441 " %s", cdp->cd_name) == -1) 1442 return -1; 1443 cap_hw1 &= ~cdp->cd_mask; 1444 } 1445 ++cdp; 1446 } 1447 if (cap_hw1) 1448 if (file_printf(ms, 1449 " unknown hardware capability %#" 1450 INT64_T_FORMAT "x", 1451 (unsigned long long)cap_hw1) == -1) 1452 return -1; 1453 } else { 1454 if (file_printf(ms, 1455 " hardware capability %#" INT64_T_FORMAT "x", 1456 (unsigned long long)cap_hw1) == -1) 1457 return -1; 1458 } 1459 } 1460 if (cap_sf1) { 1461 if (cap_sf1 & SF1_SUNW_FPUSED) { 1462 if (file_printf(ms, 1463 (cap_sf1 & SF1_SUNW_FPKNWN) 1464 ? ", uses frame pointer" 1465 : ", not known to use frame pointer") == -1) 1466 return -1; 1467 } 1468 cap_sf1 &= ~SF1_SUNW_MASK; 1469 if (cap_sf1) 1470 if (file_printf(ms, 1471 ", with unknown software capability %#" 1472 INT64_T_FORMAT "x", 1473 (unsigned long long)cap_sf1) == -1) 1474 return -1; 1475 } 1476 return 0; 1477 } 1478 1479 /* 1480 * Look through the program headers of an executable image, searching 1481 * for a PT_INTERP section; if one is found, it's dynamically linked, 1482 * otherwise it's statically linked. 1483 */ 1484 private int 1485 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1486 int num, size_t size, off_t fsize, int sh_num, int *flags, 1487 uint16_t *notecount) 1488 { 1489 Elf32_Phdr ph32; 1490 Elf64_Phdr ph64; 1491 const char *linking_style = "statically"; 1492 const char *interp = ""; 1493 unsigned char nbuf[BUFSIZ]; 1494 char ibuf[BUFSIZ]; 1495 ssize_t bufsize; 1496 size_t offset, align, len; 1497 1498 if (size != xph_sizeof) { 1499 if (file_printf(ms, ", corrupted program header size") == -1) 1500 return -1; 1501 return 0; 1502 } 1503 1504 for ( ; num; num--) { 1505 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) { 1506 file_badread(ms); 1507 return -1; 1508 } 1509 1510 off += size; 1511 bufsize = 0; 1512 align = 4; 1513 1514 /* Things we can determine before we seek */ 1515 switch (xph_type) { 1516 case PT_DYNAMIC: 1517 linking_style = "dynamically"; 1518 break; 1519 case PT_NOTE: 1520 if (sh_num) /* Did this through section headers */ 1521 continue; 1522 if (((align = xph_align) & 0x80000000UL) != 0 || 1523 align < 4) { 1524 if (file_printf(ms, 1525 ", invalid note alignment %#lx", 1526 (unsigned long)align) == -1) 1527 return -1; 1528 align = 4; 1529 } 1530 /*FALLTHROUGH*/ 1531 case PT_INTERP: 1532 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1533 : sizeof(nbuf); 1534 bufsize = pread(fd, nbuf, len, xph_offset); 1535 if (bufsize == -1) { 1536 file_badread(ms); 1537 return -1; 1538 } 1539 break; 1540 default: 1541 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1542 /* Maybe warn here? */ 1543 continue; 1544 } 1545 break; 1546 } 1547 1548 /* Things we can determine when we seek */ 1549 switch (xph_type) { 1550 case PT_INTERP: 1551 if (bufsize && nbuf[0]) { 1552 nbuf[bufsize - 1] = '\0'; 1553 interp = (const char *)nbuf; 1554 } else 1555 interp = "*empty*"; 1556 break; 1557 case PT_NOTE: 1558 /* 1559 * This is a PT_NOTE section; loop through all the notes 1560 * in the section. 1561 */ 1562 offset = 0; 1563 for (;;) { 1564 if (offset >= (size_t)bufsize) 1565 break; 1566 offset = donote(ms, nbuf, offset, 1567 (size_t)bufsize, clazz, swap, align, 1568 flags, notecount, fd, 0, 0, 0); 1569 if (offset == 0) 1570 break; 1571 } 1572 break; 1573 default: 1574 break; 1575 } 1576 } 1577 if (file_printf(ms, ", %s linked", linking_style) 1578 == -1) 1579 return -1; 1580 if (interp[0]) 1581 if (file_printf(ms, ", interpreter %s", 1582 file_printable(ibuf, sizeof(ibuf), interp)) == -1) 1583 return -1; 1584 return 0; 1585 } 1586 1587 1588 protected int 1589 file_tryelf(struct magic_set *ms, const struct buffer *b) 1590 { 1591 int fd = b->fd; 1592 const unsigned char *buf = b->fbuf; 1593 size_t nbytes = b->flen; 1594 union { 1595 int32_t l; 1596 char c[sizeof (int32_t)]; 1597 } u; 1598 int clazz; 1599 int swap; 1600 struct stat st; 1601 off_t fsize; 1602 int flags = 0; 1603 Elf32_Ehdr elf32hdr; 1604 Elf64_Ehdr elf64hdr; 1605 uint16_t type, phnum, shnum, notecount; 1606 1607 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION)) 1608 return 0; 1609 /* 1610 * ELF executables have multiple section headers in arbitrary 1611 * file locations and thus file(1) cannot determine it from easily. 1612 * Instead we traverse thru all section headers until a symbol table 1613 * one is found or else the binary is stripped. 1614 * Return immediately if it's not ELF (so we avoid pipe2file unless needed). 1615 */ 1616 if (buf[EI_MAG0] != ELFMAG0 1617 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1618 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1619 return 0; 1620 1621 /* 1622 * If we cannot seek, it must be a pipe, socket or fifo. 1623 */ 1624 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) 1625 fd = file_pipe2file(ms, fd, buf, nbytes); 1626 1627 if (fstat(fd, &st) == -1) { 1628 file_badread(ms); 1629 return -1; 1630 } 1631 if (S_ISREG(st.st_mode) || st.st_size != 0) 1632 fsize = st.st_size; 1633 else 1634 fsize = SIZE_UNKNOWN; 1635 1636 clazz = buf[EI_CLASS]; 1637 1638 switch (clazz) { 1639 case ELFCLASS32: 1640 #undef elf_getu 1641 #define elf_getu(a, b) elf_getu32(a, b) 1642 #undef elfhdr 1643 #define elfhdr elf32hdr 1644 #include "elfclass.h" 1645 case ELFCLASS64: 1646 #undef elf_getu 1647 #define elf_getu(a, b) elf_getu64(a, b) 1648 #undef elfhdr 1649 #define elfhdr elf64hdr 1650 #include "elfclass.h" 1651 default: 1652 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1653 return -1; 1654 break; 1655 } 1656 return 0; 1657 } 1658 #endif 1659