1 /* $NetBSD: readelf.c,v 1.24 2020/06/15 00:37:24 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 1.173 2020/06/07 22:12:54 christos Exp $") 34 #else 35 __RCSID("$NetBSD: readelf.c,v 1.24 2020/06/15 00:37:24 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 CAST(off_t, -1) 72 73 private int 74 toomany(struct magic_set *ms, const char *name, uint16_t num) 75 { 76 if (ms->flags & MAGIC_MIME) 77 return 1; 78 if (file_printf(ms, ", too many %s (%u)", name, num) == -1) 79 return -1; 80 return 1; 81 } 82 83 private uint16_t 84 getu16(int swap, uint16_t value) 85 { 86 union { 87 uint16_t ui; 88 char c[2]; 89 } retval, tmpval; 90 91 if (swap) { 92 tmpval.ui = value; 93 94 retval.c[0] = tmpval.c[1]; 95 retval.c[1] = tmpval.c[0]; 96 97 return retval.ui; 98 } else 99 return value; 100 } 101 102 private uint32_t 103 getu32(int swap, uint32_t value) 104 { 105 union { 106 uint32_t ui; 107 char c[4]; 108 } retval, tmpval; 109 110 if (swap) { 111 tmpval.ui = value; 112 113 retval.c[0] = tmpval.c[3]; 114 retval.c[1] = tmpval.c[2]; 115 retval.c[2] = tmpval.c[1]; 116 retval.c[3] = tmpval.c[0]; 117 118 return retval.ui; 119 } else 120 return value; 121 } 122 123 private uint64_t 124 getu64(int swap, uint64_t value) 125 { 126 union { 127 uint64_t ui; 128 char c[8]; 129 } retval, tmpval; 130 131 if (swap) { 132 tmpval.ui = value; 133 134 retval.c[0] = tmpval.c[7]; 135 retval.c[1] = tmpval.c[6]; 136 retval.c[2] = tmpval.c[5]; 137 retval.c[3] = tmpval.c[4]; 138 retval.c[4] = tmpval.c[3]; 139 retval.c[5] = tmpval.c[2]; 140 retval.c[6] = tmpval.c[1]; 141 retval.c[7] = tmpval.c[0]; 142 143 return retval.ui; 144 } else 145 return value; 146 } 147 148 #define elf_getu16(swap, value) getu16(swap, value) 149 #define elf_getu32(swap, value) getu32(swap, value) 150 #define elf_getu64(swap, value) getu64(swap, value) 151 152 #define xsh_addr (clazz == ELFCLASS32 \ 153 ? CAST(void *, &sh32) \ 154 : CAST(void *, &sh64)) 155 #define xsh_sizeof (clazz == ELFCLASS32 \ 156 ? sizeof(sh32) \ 157 : sizeof(sh64)) 158 #define xsh_size CAST(size_t, (clazz == ELFCLASS32 \ 159 ? elf_getu32(swap, sh32.sh_size) \ 160 : elf_getu64(swap, sh64.sh_size))) 161 #define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \ 162 ? elf_getu32(swap, sh32.sh_offset) \ 163 : elf_getu64(swap, sh64.sh_offset))) 164 #define xsh_type (clazz == ELFCLASS32 \ 165 ? elf_getu32(swap, sh32.sh_type) \ 166 : elf_getu32(swap, sh64.sh_type)) 167 #define xsh_name (clazz == ELFCLASS32 \ 168 ? elf_getu32(swap, sh32.sh_name) \ 169 : elf_getu32(swap, sh64.sh_name)) 170 171 #define xph_addr (clazz == ELFCLASS32 \ 172 ? CAST(void *, &ph32) \ 173 : CAST(void *, &ph64)) 174 #define xph_sizeof (clazz == ELFCLASS32 \ 175 ? sizeof(ph32) \ 176 : sizeof(ph64)) 177 #define xph_type (clazz == ELFCLASS32 \ 178 ? elf_getu32(swap, ph32.p_type) \ 179 : elf_getu32(swap, ph64.p_type)) 180 #define xph_offset CAST(off_t, (clazz == ELFCLASS32 \ 181 ? elf_getu32(swap, ph32.p_offset) \ 182 : elf_getu64(swap, ph64.p_offset))) 183 #define xph_align CAST(size_t, (clazz == ELFCLASS32 \ 184 ? CAST(off_t, (ph32.p_align ? \ 185 elf_getu32(swap, ph32.p_align) : 4))\ 186 : CAST(off_t, (ph64.p_align ? \ 187 elf_getu64(swap, ph64.p_align) : 4)))) 188 #define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \ 189 ? CAST(off_t, (ph32.p_vaddr ? \ 190 elf_getu32(swap, ph32.p_vaddr) : 4))\ 191 : CAST(off_t, (ph64.p_vaddr ? \ 192 elf_getu64(swap, ph64.p_vaddr) : 4)))) 193 #define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \ 194 ? elf_getu32(swap, ph32.p_filesz) \ 195 : elf_getu64(swap, ph64.p_filesz))) 196 #define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \ 197 ? elf_getu32(swap, ph32.p_memsz) \ 198 : elf_getu64(swap, ph64.p_memsz)))) 199 #define xnh_addr (clazz == ELFCLASS32 \ 200 ? CAST(void *, &nh32) \ 201 : CAST(void *, &nh64)) 202 #define xnh_sizeof (clazz == ELFCLASS32 \ 203 ? sizeof(nh32) \ 204 : sizeof(nh64)) 205 #define xnh_type (clazz == ELFCLASS32 \ 206 ? elf_getu32(swap, nh32.n_type) \ 207 : elf_getu32(swap, nh64.n_type)) 208 #define xnh_namesz (clazz == ELFCLASS32 \ 209 ? elf_getu32(swap, nh32.n_namesz) \ 210 : elf_getu32(swap, nh64.n_namesz)) 211 #define xnh_descsz (clazz == ELFCLASS32 \ 212 ? elf_getu32(swap, nh32.n_descsz) \ 213 : elf_getu32(swap, nh64.n_descsz)) 214 215 #define xdh_addr (clazz == ELFCLASS32 \ 216 ? CAST(void *, &dh32) \ 217 : CAST(void *, &dh64)) 218 #define xdh_sizeof (clazz == ELFCLASS32 \ 219 ? sizeof(dh32) \ 220 : sizeof(dh64)) 221 #define xdh_tag (clazz == ELFCLASS32 \ 222 ? elf_getu32(swap, dh32.d_tag) \ 223 : elf_getu64(swap, dh64.d_tag)) 224 #define xdh_val (clazz == ELFCLASS32 \ 225 ? elf_getu32(swap, dh32.d_un.d_val) \ 226 : elf_getu64(swap, dh64.d_un.d_val)) 227 228 #define xcap_addr (clazz == ELFCLASS32 \ 229 ? CAST(void *, &cap32) \ 230 : CAST(void *, &cap64)) 231 #define xcap_sizeof (clazz == ELFCLASS32 \ 232 ? sizeof(cap32) \ 233 : sizeof(cap64)) 234 #define xcap_tag (clazz == ELFCLASS32 \ 235 ? elf_getu32(swap, cap32.c_tag) \ 236 : elf_getu64(swap, cap64.c_tag)) 237 #define xcap_val (clazz == ELFCLASS32 \ 238 ? elf_getu32(swap, cap32.c_un.c_val) \ 239 : elf_getu64(swap, cap64.c_un.c_val)) 240 241 #define xauxv_addr (clazz == ELFCLASS32 \ 242 ? CAST(void *, &auxv32) \ 243 : CAST(void *, &auxv64)) 244 #define xauxv_sizeof (clazz == ELFCLASS32 \ 245 ? sizeof(auxv32) \ 246 : sizeof(auxv64)) 247 #define xauxv_type (clazz == ELFCLASS32 \ 248 ? elf_getu32(swap, auxv32.a_type) \ 249 : elf_getu64(swap, auxv64.a_type)) 250 #define xauxv_val (clazz == ELFCLASS32 \ 251 ? elf_getu32(swap, auxv32.a_v) \ 252 : elf_getu64(swap, auxv64.a_v)) 253 254 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 255 ? prpsoffsets32[i] \ 256 : prpsoffsets64[i]) 257 258 #ifdef ELFCORE 259 /* 260 * Try larger offsets first to avoid false matches 261 * from earlier data that happen to look like strings. 262 */ 263 static const size_t prpsoffsets32[] = { 264 #ifdef USE_NT_PSINFO 265 104, /* SunOS 5.x (command line) */ 266 88, /* SunOS 5.x (short name) */ 267 #endif /* USE_NT_PSINFO */ 268 269 100, /* SunOS 5.x (command line) */ 270 84, /* SunOS 5.x (short name) */ 271 272 44, /* Linux (command line) */ 273 28, /* Linux (short name) */ 274 275 48, /* Linux PowerPC (command line) */ 276 32, /* Linux PowerPC (short name) */ 277 278 8, /* FreeBSD */ 279 }; 280 281 static const size_t prpsoffsets64[] = { 282 #ifdef USE_NT_PSINFO 283 152, /* SunOS 5.x (command line) */ 284 136, /* SunOS 5.x (short name) */ 285 #endif /* USE_NT_PSINFO */ 286 287 136, /* SunOS 5.x, 64-bit (command line) */ 288 120, /* SunOS 5.x, 64-bit (short name) */ 289 290 56, /* Linux (command line) */ 291 40, /* Linux (tested on core from 2.4.x, short name) */ 292 293 16, /* FreeBSD, 64-bit */ 294 }; 295 296 #define NOFFSETS32 __arraycount(prpsoffsets32) 297 #define NOFFSETS64 __arraycount(prpsoffsets64) 298 299 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 300 301 /* 302 * Look through the program headers of an executable image, searching 303 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 304 * "FreeBSD"; if one is found, try looking in various places in its 305 * contents for a 16-character string containing only printable 306 * characters - if found, that string should be the name of the program 307 * that dropped core. Note: right after that 16-character string is, 308 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 309 * Linux, a longer string (80 characters, in 5.x, probably other 310 * SVR4-flavored systems, and Linux) containing the start of the 311 * command line for that program. 312 * 313 * SunOS 5.x core files contain two PT_NOTE sections, with the types 314 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 315 * same info about the command name and command line, so it probably 316 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 317 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 318 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 319 * the SunOS 5.x file command relies on this (and prefers the latter). 320 * 321 * The signal number probably appears in a section of type NT_PRSTATUS, 322 * but that's also rather OS-dependent, in ways that are harder to 323 * dissect with heuristics, so I'm not bothering with the signal number. 324 * (I suppose the signal number could be of interest in situations where 325 * you don't have the binary of the program that dropped core; if you 326 * *do* have that binary, the debugger will probably tell you what 327 * signal it was.) 328 */ 329 330 #define OS_STYLE_SVR4 0 331 #define OS_STYLE_FREEBSD 1 332 #define OS_STYLE_NETBSD 2 333 334 private const char os_style_names[][8] = { 335 "SVR4", 336 "FreeBSD", 337 "NetBSD", 338 }; 339 340 #define FLAGS_CORE_STYLE 0x0003 341 342 #define FLAGS_DID_CORE 0x0004 343 #define FLAGS_DID_OS_NOTE 0x0008 344 #define FLAGS_DID_BUILD_ID 0x0010 345 #define FLAGS_DID_CORE_STYLE 0x0020 346 #define FLAGS_DID_NETBSD_PAX 0x0040 347 #define FLAGS_DID_NETBSD_MARCH 0x0080 348 #define FLAGS_DID_NETBSD_CMODEL 0x0100 349 #define FLAGS_DID_NETBSD_EMULATION 0x0200 350 #define FLAGS_DID_NETBSD_UNKNOWN 0x0400 351 #define FLAGS_IS_CORE 0x0800 352 #define FLAGS_DID_AUXV 0x1000 353 354 private int 355 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 356 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 357 { 358 Elf32_Phdr ph32; 359 Elf64_Phdr ph64; 360 size_t offset, len; 361 unsigned char nbuf[BUFSIZ]; 362 ssize_t bufsize; 363 off_t ph_off = off; 364 int ph_num = num; 365 366 if (ms->flags & MAGIC_MIME) 367 return 0; 368 369 if (num == 0) { 370 if (file_printf(ms, ", no program header") == -1) 371 return -1; 372 return 0; 373 } 374 if (size != xph_sizeof) { 375 if (file_printf(ms, ", corrupted program header size") == -1) 376 return -1; 377 return 0; 378 } 379 380 /* 381 * Loop through all the program headers. 382 */ 383 for ( ; num; num--) { 384 if (pread(fd, xph_addr, xph_sizeof, off) < 385 CAST(ssize_t, xph_sizeof)) { 386 file_badread(ms); 387 return -1; 388 } 389 off += size; 390 391 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 392 /* Perhaps warn here */ 393 continue; 394 } 395 396 if (xph_type != PT_NOTE) 397 continue; 398 399 /* 400 * This is a PT_NOTE section; loop through all the notes 401 * in the section. 402 */ 403 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 404 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) { 405 file_badread(ms); 406 return -1; 407 } 408 offset = 0; 409 for (;;) { 410 if (offset >= CAST(size_t, bufsize)) 411 break; 412 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize), 413 clazz, swap, 4, flags, notecount, fd, ph_off, 414 ph_num, fsize); 415 if (offset == 0) 416 break; 417 418 } 419 } 420 return 0; 421 } 422 #endif 423 424 static int 425 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 426 { 427 uint32_t desc; 428 memcpy(&desc, v, sizeof(desc)); 429 desc = elf_getu32(swap, desc); 430 431 if (file_printf(ms, ", for NetBSD") == -1) 432 return -1; 433 /* 434 * The version number used to be stuck as 199905, and was thus 435 * basically content-free. Newer versions of NetBSD have fixed 436 * this and now use the encoding of __NetBSD_Version__: 437 * 438 * MMmmrrpp00 439 * 440 * M = major version 441 * m = minor version 442 * r = release ["",A-Z,Z[A-Z] but numeric] 443 * p = patchlevel 444 */ 445 if (desc > 100000000U) { 446 uint32_t ver_patch = (desc / 100) % 100; 447 uint32_t ver_rel = (desc / 10000) % 100; 448 uint32_t ver_min = (desc / 1000000) % 100; 449 uint32_t ver_maj = desc / 100000000; 450 451 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 452 return -1; 453 if (ver_rel == 0 && ver_patch != 0) { 454 if (file_printf(ms, ".%u", ver_patch) == -1) 455 return -1; 456 } else if (ver_rel != 0) { 457 while (ver_rel > 26) { 458 if (file_printf(ms, "Z") == -1) 459 return -1; 460 ver_rel -= 26; 461 } 462 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 463 == -1) 464 return -1; 465 } 466 } 467 return 0; 468 } 469 470 static int 471 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 472 { 473 uint32_t desc; 474 475 memcpy(&desc, v, sizeof(desc)); 476 desc = elf_getu32(swap, desc); 477 if (file_printf(ms, ", for FreeBSD") == -1) 478 return -1; 479 480 /* 481 * Contents is __FreeBSD_version, whose relation to OS 482 * versions is defined by a huge table in the Porter's 483 * Handbook. This is the general scheme: 484 * 485 * Releases: 486 * Mmp000 (before 4.10) 487 * Mmi0p0 (before 5.0) 488 * Mmm0p0 489 * 490 * Development branches: 491 * Mmpxxx (before 4.6) 492 * Mmp1xx (before 4.10) 493 * Mmi1xx (before 5.0) 494 * M000xx (pre-M.0) 495 * Mmm1xx 496 * 497 * M = major version 498 * m = minor version 499 * i = minor version increment (491000 -> 4.10) 500 * p = patchlevel 501 * x = revision 502 * 503 * The first release of FreeBSD to use ELF by default 504 * was version 3.0. 505 */ 506 if (desc == 460002) { 507 if (file_printf(ms, " 4.6.2") == -1) 508 return -1; 509 } else if (desc < 460100) { 510 if (file_printf(ms, " %d.%d", desc / 100000, 511 desc / 10000 % 10) == -1) 512 return -1; 513 if (desc / 1000 % 10 > 0) 514 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 515 return -1; 516 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 517 if (file_printf(ms, " (%d)", desc) == -1) 518 return -1; 519 } else if (desc < 500000) { 520 if (file_printf(ms, " %d.%d", desc / 100000, 521 desc / 10000 % 10 + desc / 1000 % 10) == -1) 522 return -1; 523 if (desc / 100 % 10 > 0) { 524 if (file_printf(ms, " (%d)", desc) == -1) 525 return -1; 526 } else if (desc / 10 % 10 > 0) { 527 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 528 return -1; 529 } 530 } else { 531 if (file_printf(ms, " %d.%d", desc / 100000, 532 desc / 1000 % 100) == -1) 533 return -1; 534 if ((desc / 100 % 10 > 0) || 535 (desc % 100000 / 100 == 0)) { 536 if (file_printf(ms, " (%d)", desc) == -1) 537 return -1; 538 } else if (desc / 10 % 10 > 0) { 539 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 540 return -1; 541 } 542 } 543 return 0; 544 } 545 546 private int 547 /*ARGSUSED*/ 548 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 549 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 550 size_t noff, size_t doff, int *flags) 551 { 552 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 && 553 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) { 554 uint8_t desc[20]; 555 const char *btype; 556 uint32_t i; 557 *flags |= FLAGS_DID_BUILD_ID; 558 switch (descsz) { 559 case 8: 560 btype = "xxHash"; 561 break; 562 case 16: 563 btype = "md5/uuid"; 564 break; 565 case 20: 566 btype = "sha1"; 567 break; 568 default: 569 btype = "unknown"; 570 break; 571 } 572 if (file_printf(ms, ", BuildID[%s]=", btype) == -1) 573 return -1; 574 memcpy(desc, &nbuf[doff], descsz); 575 for (i = 0; i < descsz; i++) 576 if (file_printf(ms, "%02x", desc[i]) == -1) 577 return -1; 578 return 1; 579 } 580 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 && 581 type == NT_GO_BUILD_ID && descsz < 128) { 582 char buf[256]; 583 if (file_printf(ms, ", Go BuildID=%s", 584 file_copystr(buf, sizeof(buf), descsz, 585 RCAST(const char *, &nbuf[doff]))) == -1) 586 return -1; 587 return 1; 588 } 589 return 0; 590 } 591 592 private int 593 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 594 int swap, uint32_t namesz, uint32_t descsz, 595 size_t noff, size_t doff, int *flags) 596 { 597 const char *name = RCAST(const char *, &nbuf[noff]); 598 599 if (namesz == 5 && strcmp(name, "SuSE") == 0 && 600 type == NT_GNU_VERSION && descsz == 2) { 601 *flags |= FLAGS_DID_OS_NOTE; 602 if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff], 603 nbuf[doff + 1]) == -1) 604 return -1; 605 return 1; 606 } 607 608 if (namesz == 4 && strcmp(name, "GNU") == 0 && 609 type == NT_GNU_VERSION && descsz == 16) { 610 uint32_t desc[4]; 611 memcpy(desc, &nbuf[doff], sizeof(desc)); 612 613 *flags |= FLAGS_DID_OS_NOTE; 614 if (file_printf(ms, ", for GNU/") == -1) 615 return -1; 616 switch (elf_getu32(swap, desc[0])) { 617 case GNU_OS_LINUX: 618 if (file_printf(ms, "Linux") == -1) 619 return -1; 620 break; 621 case GNU_OS_HURD: 622 if (file_printf(ms, "Hurd") == -1) 623 return -1; 624 break; 625 case GNU_OS_SOLARIS: 626 if (file_printf(ms, "Solaris") == -1) 627 return -1; 628 break; 629 case GNU_OS_KFREEBSD: 630 if (file_printf(ms, "kFreeBSD") == -1) 631 return -1; 632 break; 633 case GNU_OS_KNETBSD: 634 if (file_printf(ms, "kNetBSD") == -1) 635 return -1; 636 break; 637 default: 638 if (file_printf(ms, "<unknown>") == -1) 639 return -1; 640 } 641 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 642 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 643 return -1; 644 return 1; 645 } 646 647 if (namesz == 7 && strcmp(name, "NetBSD") == 0) { 648 if (type == NT_NETBSD_VERSION && descsz == 4) { 649 *flags |= FLAGS_DID_OS_NOTE; 650 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1) 651 return -1; 652 return 1; 653 } 654 } 655 656 if (namesz == 8 && strcmp(name, "FreeBSD") == 0) { 657 if (type == NT_FREEBSD_VERSION && descsz == 4) { 658 *flags |= FLAGS_DID_OS_NOTE; 659 if (do_note_freebsd_version(ms, swap, &nbuf[doff]) 660 == -1) 661 return -1; 662 return 1; 663 } 664 } 665 666 if (namesz == 8 && strcmp(name, "OpenBSD") == 0 && 667 type == NT_OPENBSD_VERSION && descsz == 4) { 668 *flags |= FLAGS_DID_OS_NOTE; 669 if (file_printf(ms, ", for OpenBSD") == -1) 670 return -1; 671 /* Content of note is always 0 */ 672 return 1; 673 } 674 675 if (namesz == 10 && strcmp(name, "DragonFly") == 0 && 676 type == NT_DRAGONFLY_VERSION && descsz == 4) { 677 uint32_t desc; 678 *flags |= FLAGS_DID_OS_NOTE; 679 if (file_printf(ms, ", for DragonFly") == -1) 680 return -1; 681 memcpy(&desc, &nbuf[doff], sizeof(desc)); 682 desc = elf_getu32(swap, desc); 683 if (file_printf(ms, " %d.%d.%d", desc / 100000, 684 desc / 10000 % 10, desc % 10000) == -1) 685 return -1; 686 return 1; 687 } 688 return 0; 689 } 690 691 private int 692 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 693 int swap, uint32_t namesz, uint32_t descsz, 694 size_t noff, size_t doff, int *flags) 695 { 696 const char *name = RCAST(const char *, &nbuf[noff]); 697 698 if (namesz == 4 && strcmp(name, "PaX") == 0 && 699 type == NT_NETBSD_PAX && descsz == 4) { 700 static const char *pax[] = { 701 "+mprotect", 702 "-mprotect", 703 "+segvguard", 704 "-segvguard", 705 "+ASLR", 706 "-ASLR", 707 }; 708 uint32_t desc; 709 size_t i; 710 int did = 0; 711 712 *flags |= FLAGS_DID_NETBSD_PAX; 713 memcpy(&desc, &nbuf[doff], sizeof(desc)); 714 desc = elf_getu32(swap, desc); 715 716 if (desc && file_printf(ms, ", PaX: ") == -1) 717 return -1; 718 719 for (i = 0; i < __arraycount(pax); i++) { 720 if (((1 << CAST(int, i)) & desc) == 0) 721 continue; 722 if (file_printf(ms, "%s%s", did++ ? "," : "", 723 pax[i]) == -1) 724 return -1; 725 } 726 return 1; 727 } 728 return 0; 729 } 730 731 private int 732 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 733 int swap, uint32_t namesz, uint32_t descsz, 734 size_t noff, size_t doff, int *flags, size_t size, int clazz) 735 { 736 #ifdef ELFCORE 737 char buf[256]; 738 const char *name = RCAST(const char *, &nbuf[noff]); 739 740 int os_style = -1; 741 /* 742 * Sigh. The 2.0.36 kernel in Debian 2.1, at 743 * least, doesn't correctly implement name 744 * sections, in core dumps, as specified by 745 * the "Program Linking" section of "UNIX(R) System 746 * V Release 4 Programmer's Guide: ANSI C and 747 * Programming Support Tools", because my copy 748 * clearly says "The first 'namesz' bytes in 'name' 749 * contain a *null-terminated* [emphasis mine] 750 * character representation of the entry's owner 751 * or originator", but the 2.0.36 kernel code 752 * doesn't include the terminating null in the 753 * name.... 754 */ 755 if ((namesz == 4 && strncmp(name, "CORE", 4) == 0) || 756 (namesz == 5 && strcmp(name, "CORE") == 0)) { 757 os_style = OS_STYLE_SVR4; 758 } 759 760 if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) { 761 os_style = OS_STYLE_FREEBSD; 762 } 763 764 if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11) 765 == 0)) { 766 os_style = OS_STYLE_NETBSD; 767 } 768 769 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 770 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 771 == -1) 772 return -1; 773 *flags |= FLAGS_DID_CORE_STYLE; 774 *flags |= os_style; 775 } 776 777 switch (os_style) { 778 case OS_STYLE_NETBSD: 779 if (type == NT_NETBSD_CORE_PROCINFO) { 780 char sbuf[512]; 781 struct NetBSD_elfcore_procinfo pi; 782 memset(&pi, 0, sizeof(pi)); 783 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi))); 784 785 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, " 786 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)", 787 file_printable(sbuf, sizeof(sbuf), 788 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)), 789 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)), 790 elf_getu32(swap, pi.cpi_euid), 791 elf_getu32(swap, pi.cpi_egid), 792 elf_getu32(swap, pi.cpi_nlwps), 793 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)), 794 elf_getu32(swap, pi.cpi_signo), 795 elf_getu32(swap, pi.cpi_sigcode)) == -1) 796 return -1; 797 798 *flags |= FLAGS_DID_CORE; 799 return 1; 800 } 801 break; 802 803 case OS_STYLE_FREEBSD: 804 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 805 size_t argoff, pidoff; 806 807 if (clazz == ELFCLASS32) 808 argoff = 4 + 4 + 17; 809 else 810 argoff = 4 + 4 + 8 + 17; 811 if (file_printf(ms, ", from '%.80s'", nbuf + doff + 812 argoff) == -1) 813 return -1; 814 pidoff = argoff + 81 + 2; 815 if (doff + pidoff + 4 <= size) { 816 if (file_printf(ms, ", pid=%u", 817 elf_getu32(swap, *RCAST(uint32_t *, (nbuf + 818 doff + pidoff)))) == -1) 819 return -1; 820 } 821 *flags |= FLAGS_DID_CORE; 822 } 823 break; 824 825 default: 826 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 827 size_t i, j; 828 unsigned char c; 829 /* 830 * Extract the program name. We assume 831 * it to be 16 characters (that's what it 832 * is in SunOS 5.x and Linux). 833 * 834 * Unfortunately, it's at a different offset 835 * in various OSes, so try multiple offsets. 836 * If the characters aren't all printable, 837 * reject it. 838 */ 839 for (i = 0; i < NOFFSETS; i++) { 840 unsigned char *cname, *cp; 841 size_t reloffset = prpsoffsets(i); 842 size_t noffset = doff + reloffset; 843 size_t k; 844 for (j = 0; j < 16; j++, noffset++, 845 reloffset++) { 846 /* 847 * Make sure we're not past 848 * the end of the buffer; if 849 * we are, just give up. 850 */ 851 if (noffset >= size) 852 goto tryanother; 853 854 /* 855 * Make sure we're not past 856 * the end of the contents; 857 * if we are, this obviously 858 * isn't the right offset. 859 */ 860 if (reloffset >= descsz) 861 goto tryanother; 862 863 c = nbuf[noffset]; 864 if (c == '\0') { 865 /* 866 * A '\0' at the 867 * beginning is 868 * obviously wrong. 869 * Any other '\0' 870 * means we're done. 871 */ 872 if (j == 0) 873 goto tryanother; 874 else 875 break; 876 } else { 877 /* 878 * A nonprintable 879 * character is also 880 * wrong. 881 */ 882 if (!isprint(c) || isquote(c)) 883 goto tryanother; 884 } 885 } 886 /* 887 * Well, that worked. 888 */ 889 890 /* 891 * Try next offsets, in case this match is 892 * in the middle of a string. 893 */ 894 for (k = i + 1 ; k < NOFFSETS; k++) { 895 size_t no; 896 int adjust = 1; 897 if (prpsoffsets(k) >= prpsoffsets(i)) 898 continue; 899 for (no = doff + prpsoffsets(k); 900 no < doff + prpsoffsets(i); no++) 901 adjust = adjust 902 && isprint(nbuf[no]); 903 if (adjust) 904 i = k; 905 } 906 907 cname = CAST(unsigned char *, 908 &nbuf[doff + prpsoffsets(i)]); 909 for (cp = cname; cp < nbuf + size && *cp 910 && isprint(*cp); cp++) 911 continue; 912 /* 913 * Linux apparently appends a space at the end 914 * of the command line: remove it. 915 */ 916 while (cp > cname && isspace(cp[-1])) 917 cp--; 918 if (file_printf(ms, ", from '%s'", 919 file_copystr(buf, sizeof(buf), 920 CAST(size_t, cp - cname), 921 CAST(const char *, cname))) == -1) 922 return -1; 923 *flags |= FLAGS_DID_CORE; 924 return 1; 925 926 tryanother: 927 ; 928 } 929 } 930 break; 931 } 932 #endif 933 return 0; 934 } 935 936 private off_t 937 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, 938 off_t off, int num, off_t fsize, uint64_t virtaddr) 939 { 940 Elf32_Phdr ph32; 941 Elf64_Phdr ph64; 942 943 /* 944 * Loop through all the program headers and find the header with 945 * virtual address in which the "virtaddr" belongs to. 946 */ 947 for ( ; num; num--) { 948 if (pread(fd, xph_addr, xph_sizeof, off) < 949 CAST(ssize_t, xph_sizeof)) { 950 file_badread(ms); 951 return -1; 952 } 953 off += xph_sizeof; 954 955 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 956 /* Perhaps warn here */ 957 continue; 958 } 959 960 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) 961 return xph_offset + (virtaddr - xph_vaddr); 962 } 963 return 0; 964 } 965 966 private size_t 967 get_string_on_virtaddr(struct magic_set *ms, 968 int swap, int clazz, int fd, off_t ph_off, int ph_num, 969 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) 970 { 971 char *bptr; 972 off_t offset; 973 974 if (buflen == 0) 975 return 0; 976 977 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, 978 fsize, virtaddr); 979 if (offset < 0 || 980 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) { 981 file_badread(ms); 982 return 0; 983 } 984 985 buf[buflen - 1] = '\0'; 986 987 /* We expect only printable characters, so return if buffer contains 988 * non-printable character before the '\0' or just '\0'. */ 989 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++) 990 continue; 991 if (*bptr != '\0') 992 return 0; 993 994 return bptr - buf; 995 } 996 997 998 /*ARGSUSED*/ 999 private int 1000 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 1001 int swap, uint32_t namesz __attribute__((__unused__)), 1002 uint32_t descsz __attribute__((__unused__)), 1003 size_t noff __attribute__((__unused__)), size_t doff, 1004 int *flags, size_t size __attribute__((__unused__)), int clazz, 1005 int fd, off_t ph_off, int ph_num, off_t fsize) 1006 { 1007 #ifdef ELFCORE 1008 Aux32Info auxv32; 1009 Aux64Info auxv64; 1010 size_t elsize = xauxv_sizeof; 1011 const char *tag; 1012 int is_string; 1013 size_t nval; 1014 1015 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != 1016 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) 1017 return 0; 1018 1019 switch (*flags & FLAGS_CORE_STYLE) { 1020 case OS_STYLE_SVR4: 1021 if (type != NT_AUXV) 1022 return 0; 1023 break; 1024 #ifdef notyet 1025 case OS_STYLE_NETBSD: 1026 if (type != NT_NETBSD_CORE_AUXV) 1027 return 0; 1028 break; 1029 case OS_STYLE_FREEBSD: 1030 if (type != NT_FREEBSD_PROCSTAT_AUXV) 1031 return 0; 1032 break; 1033 #endif 1034 default: 1035 return 0; 1036 } 1037 1038 *flags |= FLAGS_DID_AUXV; 1039 1040 nval = 0; 1041 for (size_t off = 0; off + elsize <= descsz; off += elsize) { 1042 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 1043 /* Limit processing to 50 vector entries to prevent DoS */ 1044 if (nval++ >= 50) { 1045 file_error(ms, 0, "Too many ELF Auxv elements"); 1046 return 1; 1047 } 1048 1049 switch(xauxv_type) { 1050 case AT_LINUX_EXECFN: 1051 is_string = 1; 1052 tag = "execfn"; 1053 break; 1054 case AT_LINUX_PLATFORM: 1055 is_string = 1; 1056 tag = "platform"; 1057 break; 1058 case AT_LINUX_UID: 1059 is_string = 0; 1060 tag = "real uid"; 1061 break; 1062 case AT_LINUX_GID: 1063 is_string = 0; 1064 tag = "real gid"; 1065 break; 1066 case AT_LINUX_EUID: 1067 is_string = 0; 1068 tag = "effective uid"; 1069 break; 1070 case AT_LINUX_EGID: 1071 is_string = 0; 1072 tag = "effective gid"; 1073 break; 1074 default: 1075 is_string = 0; 1076 tag = NULL; 1077 break; 1078 } 1079 1080 if (tag == NULL) 1081 continue; 1082 1083 if (is_string) { 1084 char buf[256]; 1085 ssize_t buflen; 1086 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 1087 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 1088 1089 if (buflen == 0) 1090 continue; 1091 1092 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 1093 return -1; 1094 } else { 1095 if (file_printf(ms, ", %s: %d", tag, 1096 CAST(int, xauxv_val)) == -1) 1097 return -1; 1098 } 1099 } 1100 return 1; 1101 #else 1102 return 0; 1103 #endif 1104 } 1105 1106 private size_t 1107 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1108 int clazz, int swap) 1109 { 1110 Elf32_Dyn dh32; 1111 Elf64_Dyn dh64; 1112 unsigned char *dbuf = CAST(unsigned char *, vbuf); 1113 1114 if (xdh_sizeof + offset > size) { 1115 /* 1116 * We're out of note headers. 1117 */ 1118 return xdh_sizeof + offset; 1119 } 1120 1121 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof); 1122 offset += xdh_sizeof; 1123 1124 switch (xdh_tag) { 1125 case DT_FLAGS_1: 1126 if (xdh_val & DF_1_PIE) 1127 ms->mode |= 0111; 1128 else 1129 ms->mode &= ~0111; 1130 break; 1131 default: 1132 break; 1133 } 1134 return offset; 1135 } 1136 1137 1138 private size_t 1139 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1140 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1141 int fd, off_t ph_off, int ph_num, off_t fsize) 1142 { 1143 Elf32_Nhdr nh32; 1144 Elf64_Nhdr nh64; 1145 size_t noff, doff; 1146 uint32_t namesz, descsz; 1147 char buf[256]; 1148 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1149 1150 if (*notecount == 0) 1151 return 0; 1152 --*notecount; 1153 1154 if (xnh_sizeof + offset > size) { 1155 /* 1156 * We're out of note headers. 1157 */ 1158 return xnh_sizeof + offset; 1159 } 1160 /*XXX: GCC */ 1161 memset(&nh32, 0, sizeof(nh32)); 1162 memset(&nh64, 0, sizeof(nh64)); 1163 1164 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1165 offset += xnh_sizeof; 1166 1167 namesz = xnh_namesz; 1168 descsz = xnh_descsz; 1169 1170 if ((namesz == 0) && (descsz == 0)) { 1171 /* 1172 * We're out of note headers. 1173 */ 1174 return (offset >= size) ? offset : size; 1175 } 1176 1177 if (namesz & 0x80000000) { 1178 if (file_printf(ms, ", bad note name size %#lx", 1179 CAST(unsigned long, namesz)) == -1) 1180 return 0; 1181 return 0; 1182 } 1183 1184 if (descsz & 0x80000000) { 1185 if (file_printf(ms, ", bad note description size %#lx", 1186 CAST(unsigned long, descsz)) == -1) 1187 return 0; 1188 return 0; 1189 } 1190 1191 noff = offset; 1192 doff = ELF_ALIGN(offset + namesz); 1193 1194 if (offset + namesz > size) { 1195 /* 1196 * We're past the end of the buffer. 1197 */ 1198 return doff; 1199 } 1200 1201 offset = ELF_ALIGN(doff + descsz); 1202 if (doff + descsz > size) { 1203 /* 1204 * We're past the end of the buffer. 1205 */ 1206 return (offset >= size) ? offset : size; 1207 } 1208 1209 1210 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1211 if (do_os_note(ms, nbuf, xnh_type, swap, 1212 namesz, descsz, noff, doff, flags)) 1213 return offset; 1214 } 1215 1216 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1217 if (do_bid_note(ms, nbuf, xnh_type, swap, 1218 namesz, descsz, noff, doff, flags)) 1219 return offset; 1220 } 1221 1222 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1223 if (do_pax_note(ms, nbuf, xnh_type, swap, 1224 namesz, descsz, noff, doff, flags)) 1225 return offset; 1226 } 1227 1228 if ((*flags & FLAGS_DID_CORE) == 0) { 1229 if (do_core_note(ms, nbuf, xnh_type, swap, 1230 namesz, descsz, noff, doff, flags, size, clazz)) 1231 return offset; 1232 } 1233 1234 if ((*flags & FLAGS_DID_AUXV) == 0) { 1235 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1236 namesz, descsz, noff, doff, flags, size, clazz, 1237 fd, ph_off, ph_num, fsize)) 1238 return offset; 1239 } 1240 1241 if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) { 1242 int descw, flag; 1243 const char *str, *tag; 1244 if (descsz > 100) 1245 descsz = 100; 1246 switch (xnh_type) { 1247 case NT_NETBSD_VERSION: 1248 return offset; 1249 case NT_NETBSD_MARCH: 1250 flag = FLAGS_DID_NETBSD_MARCH; 1251 tag = "compiled for"; 1252 break; 1253 case NT_NETBSD_CMODEL: 1254 flag = FLAGS_DID_NETBSD_CMODEL; 1255 tag = "compiler model"; 1256 break; 1257 case NT_NETBSD_EMULATION: 1258 flag = FLAGS_DID_NETBSD_EMULATION; 1259 tag = "emulation:"; 1260 break; 1261 default: 1262 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1263 return offset; 1264 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1265 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1266 return offset; 1267 return offset; 1268 } 1269 1270 if (*flags & flag) 1271 return offset; 1272 str = RCAST(const char *, &nbuf[doff]); 1273 descw = CAST(int, descsz); 1274 *flags |= flag; 1275 file_printf(ms, ", %s: %s", tag, 1276 file_copystr(buf, sizeof(buf), descw, str)); 1277 return offset; 1278 } 1279 1280 return offset; 1281 } 1282 1283 /* SunOS 5.x hardware capability descriptions */ 1284 typedef struct cap_desc { 1285 uint64_t cd_mask; 1286 const char *cd_name; 1287 } cap_desc_t; 1288 1289 static const cap_desc_t cap_desc_sparc[] = { 1290 { AV_SPARC_MUL32, "MUL32" }, 1291 { AV_SPARC_DIV32, "DIV32" }, 1292 { AV_SPARC_FSMULD, "FSMULD" }, 1293 { AV_SPARC_V8PLUS, "V8PLUS" }, 1294 { AV_SPARC_POPC, "POPC" }, 1295 { AV_SPARC_VIS, "VIS" }, 1296 { AV_SPARC_VIS2, "VIS2" }, 1297 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1298 { AV_SPARC_FMAF, "FMAF" }, 1299 { AV_SPARC_FJFMAU, "FJFMAU" }, 1300 { AV_SPARC_IMA, "IMA" }, 1301 { 0, NULL } 1302 }; 1303 1304 static const cap_desc_t cap_desc_386[] = { 1305 { AV_386_FPU, "FPU" }, 1306 { AV_386_TSC, "TSC" }, 1307 { AV_386_CX8, "CX8" }, 1308 { AV_386_SEP, "SEP" }, 1309 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1310 { AV_386_CMOV, "CMOV" }, 1311 { AV_386_MMX, "MMX" }, 1312 { AV_386_AMD_MMX, "AMD_MMX" }, 1313 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1314 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1315 { AV_386_FXSR, "FXSR" }, 1316 { AV_386_SSE, "SSE" }, 1317 { AV_386_SSE2, "SSE2" }, 1318 { AV_386_PAUSE, "PAUSE" }, 1319 { AV_386_SSE3, "SSE3" }, 1320 { AV_386_MON, "MON" }, 1321 { AV_386_CX16, "CX16" }, 1322 { AV_386_AHF, "AHF" }, 1323 { AV_386_TSCP, "TSCP" }, 1324 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1325 { AV_386_POPCNT, "POPCNT" }, 1326 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1327 { AV_386_SSSE3, "SSSE3" }, 1328 { AV_386_SSE4_1, "SSE4.1" }, 1329 { AV_386_SSE4_2, "SSE4.2" }, 1330 { 0, NULL } 1331 }; 1332 1333 private int 1334 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1335 size_t size, off_t fsize, int mach, int strtab, int *flags, 1336 uint16_t *notecount) 1337 { 1338 Elf32_Shdr sh32; 1339 Elf64_Shdr sh64; 1340 int stripped = 1, has_debug_info = 0; 1341 size_t nbadcap = 0; 1342 void *nbuf; 1343 off_t noff, coff, name_off; 1344 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ 1345 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ 1346 char name[50]; 1347 ssize_t namesize; 1348 1349 if (ms->flags & MAGIC_MIME) 1350 return 0; 1351 1352 if (num == 0) { 1353 if (file_printf(ms, ", no section header") == -1) 1354 return -1; 1355 return 0; 1356 } 1357 if (size != xsh_sizeof) { 1358 if (file_printf(ms, ", corrupted section header size") == -1) 1359 return -1; 1360 return 0; 1361 } 1362 1363 /* Read offset of name section to be able to read section names later */ 1364 if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab))) 1365 < CAST(ssize_t, xsh_sizeof)) { 1366 if (file_printf(ms, ", missing section headers") == -1) 1367 return -1; 1368 return 0; 1369 } 1370 name_off = xsh_offset; 1371 1372 if (fsize != SIZE_UNKNOWN && fsize < name_off) { 1373 if (file_printf(ms, ", too large section header offset %jd", 1374 (intmax_t)name_off) == -1) 1375 return -1; 1376 return 0; 1377 } 1378 1379 for ( ; num; num--) { 1380 /* Read the name of this section. */ 1381 if ((namesize = pread(fd, name, sizeof(name) - 1, 1382 name_off + xsh_name)) == -1) { 1383 file_badread(ms); 1384 return -1; 1385 } 1386 name[namesize] = '\0'; 1387 if (strcmp(name, ".debug_info") == 0) { 1388 has_debug_info = 1; 1389 stripped = 0; 1390 } 1391 1392 if (pread(fd, xsh_addr, xsh_sizeof, off) < 1393 CAST(ssize_t, xsh_sizeof)) { 1394 file_badread(ms); 1395 return -1; 1396 } 1397 off += size; 1398 1399 /* Things we can determine before we seek */ 1400 switch (xsh_type) { 1401 case SHT_SYMTAB: 1402 #if 0 1403 case SHT_DYNSYM: 1404 #endif 1405 stripped = 0; 1406 break; 1407 default: 1408 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1409 /* Perhaps warn here */ 1410 continue; 1411 } 1412 break; 1413 } 1414 1415 1416 /* Things we can determine when we seek */ 1417 switch (xsh_type) { 1418 case SHT_NOTE: 1419 if (CAST(uintmax_t, (xsh_size + xsh_offset)) > 1420 CAST(uintmax_t, fsize)) { 1421 if (file_printf(ms, 1422 ", note offset/size %#" INTMAX_T_FORMAT 1423 "x+%#" INTMAX_T_FORMAT "x exceeds" 1424 " file size %#" INTMAX_T_FORMAT "x", 1425 CAST(uintmax_t, xsh_offset), 1426 CAST(uintmax_t, xsh_size), 1427 CAST(uintmax_t, fsize)) == -1) 1428 return -1; 1429 return 0; 1430 } 1431 if ((nbuf = malloc(xsh_size)) == NULL) { 1432 file_error(ms, errno, "Cannot allocate memory" 1433 " for note"); 1434 return -1; 1435 } 1436 if (pread(fd, nbuf, xsh_size, xsh_offset) < 1437 CAST(ssize_t, xsh_size)) { 1438 file_badread(ms); 1439 free(nbuf); 1440 return -1; 1441 } 1442 1443 noff = 0; 1444 for (;;) { 1445 if (noff >= CAST(off_t, xsh_size)) 1446 break; 1447 noff = donote(ms, nbuf, CAST(size_t, noff), 1448 xsh_size, clazz, swap, 4, flags, notecount, 1449 fd, 0, 0, 0); 1450 if (noff == 0) 1451 break; 1452 } 1453 free(nbuf); 1454 break; 1455 case SHT_SUNW_cap: 1456 switch (mach) { 1457 case EM_SPARC: 1458 case EM_SPARCV9: 1459 case EM_IA_64: 1460 case EM_386: 1461 case EM_AMD64: 1462 break; 1463 default: 1464 goto skip; 1465 } 1466 1467 if (nbadcap > 5) 1468 break; 1469 if (lseek(fd, xsh_offset, SEEK_SET) 1470 == CAST(off_t, -1)) { 1471 file_badseek(ms); 1472 return -1; 1473 } 1474 coff = 0; 1475 for (;;) { 1476 Elf32_Cap cap32; 1477 Elf64_Cap cap64; 1478 char cbuf[/*CONSTCOND*/ 1479 MAX(sizeof(cap32), sizeof(cap64))]; 1480 if ((coff += xcap_sizeof) > 1481 CAST(off_t, xsh_size)) 1482 break; 1483 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) != 1484 CAST(ssize_t, xcap_sizeof)) { 1485 file_badread(ms); 1486 return -1; 1487 } 1488 if (cbuf[0] == 'A') { 1489 #ifdef notyet 1490 char *p = cbuf + 1; 1491 uint32_t len, tag; 1492 memcpy(&len, p, sizeof(len)); 1493 p += 4; 1494 len = getu32(swap, len); 1495 if (memcmp("gnu", p, 3) != 0) { 1496 if (file_printf(ms, 1497 ", unknown capability %.3s", p) 1498 == -1) 1499 return -1; 1500 break; 1501 } 1502 p += strlen(p) + 1; 1503 tag = *p++; 1504 memcpy(&len, p, sizeof(len)); 1505 p += 4; 1506 len = getu32(swap, len); 1507 if (tag != 1) { 1508 if (file_printf(ms, ", unknown gnu" 1509 " capability tag %d", tag) 1510 == -1) 1511 return -1; 1512 break; 1513 } 1514 // gnu attributes 1515 #endif 1516 break; 1517 } 1518 memcpy(xcap_addr, cbuf, xcap_sizeof); 1519 switch (xcap_tag) { 1520 case CA_SUNW_NULL: 1521 break; 1522 case CA_SUNW_HW_1: 1523 cap_hw1 |= xcap_val; 1524 break; 1525 case CA_SUNW_SF_1: 1526 cap_sf1 |= xcap_val; 1527 break; 1528 default: 1529 if (file_printf(ms, 1530 ", with unknown capability " 1531 "%#" INT64_T_FORMAT "x = %#" 1532 INT64_T_FORMAT "x", 1533 CAST(unsigned long long, xcap_tag), 1534 CAST(unsigned long long, xcap_val)) 1535 == -1) 1536 return -1; 1537 if (nbadcap++ > 2) 1538 coff = xsh_size; 1539 break; 1540 } 1541 } 1542 /*FALLTHROUGH*/ 1543 skip: 1544 default: 1545 break; 1546 } 1547 } 1548 1549 if (has_debug_info) { 1550 if (file_printf(ms, ", with debug_info") == -1) 1551 return -1; 1552 } 1553 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1554 return -1; 1555 if (cap_hw1) { 1556 const cap_desc_t *cdp; 1557 switch (mach) { 1558 case EM_SPARC: 1559 case EM_SPARC32PLUS: 1560 case EM_SPARCV9: 1561 cdp = cap_desc_sparc; 1562 break; 1563 case EM_386: 1564 case EM_IA_64: 1565 case EM_AMD64: 1566 cdp = cap_desc_386; 1567 break; 1568 default: 1569 cdp = NULL; 1570 break; 1571 } 1572 if (file_printf(ms, ", uses") == -1) 1573 return -1; 1574 if (cdp) { 1575 while (cdp->cd_name) { 1576 if (cap_hw1 & cdp->cd_mask) { 1577 if (file_printf(ms, 1578 " %s", cdp->cd_name) == -1) 1579 return -1; 1580 cap_hw1 &= ~cdp->cd_mask; 1581 } 1582 ++cdp; 1583 } 1584 if (cap_hw1) 1585 if (file_printf(ms, 1586 " unknown hardware capability %#" 1587 INT64_T_FORMAT "x", 1588 CAST(unsigned long long, cap_hw1)) == -1) 1589 return -1; 1590 } else { 1591 if (file_printf(ms, 1592 " hardware capability %#" INT64_T_FORMAT "x", 1593 CAST(unsigned long long, cap_hw1)) == -1) 1594 return -1; 1595 } 1596 } 1597 if (cap_sf1) { 1598 if (cap_sf1 & SF1_SUNW_FPUSED) { 1599 if (file_printf(ms, 1600 (cap_sf1 & SF1_SUNW_FPKNWN) 1601 ? ", uses frame pointer" 1602 : ", not known to use frame pointer") == -1) 1603 return -1; 1604 } 1605 cap_sf1 &= ~SF1_SUNW_MASK; 1606 if (cap_sf1) 1607 if (file_printf(ms, 1608 ", with unknown software capability %#" 1609 INT64_T_FORMAT "x", 1610 CAST(unsigned long long, cap_sf1)) == -1) 1611 return -1; 1612 } 1613 return 0; 1614 } 1615 1616 /* 1617 * Look through the program headers of an executable image, searching 1618 * for a PT_INTERP section; if one is found, it's dynamically linked, 1619 * otherwise it's statically linked. 1620 */ 1621 private int 1622 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1623 int num, size_t size, off_t fsize, int sh_num, int *flags, 1624 uint16_t *notecount) 1625 { 1626 Elf32_Phdr ph32; 1627 Elf64_Phdr ph64; 1628 const char *linking_style = "statically"; 1629 unsigned char nbuf[BUFSIZ]; 1630 char ibuf[BUFSIZ]; 1631 char interp[BUFSIZ]; 1632 ssize_t bufsize; 1633 size_t offset, align, len; 1634 1635 if (num == 0) { 1636 if (file_printf(ms, ", no program header") == -1) 1637 return -1; 1638 return 0; 1639 } 1640 if (size != xph_sizeof) { 1641 if (file_printf(ms, ", corrupted program header size") == -1) 1642 return -1; 1643 return 0; 1644 } 1645 1646 interp[0] = '\0'; 1647 for ( ; num; num--) { 1648 int doread; 1649 if (pread(fd, xph_addr, xph_sizeof, off) < 1650 CAST(ssize_t, xph_sizeof)) { 1651 file_badread(ms); 1652 return -1; 1653 } 1654 1655 off += size; 1656 bufsize = 0; 1657 align = 4; 1658 1659 /* Things we can determine before we seek */ 1660 switch (xph_type) { 1661 case PT_DYNAMIC: 1662 doread = 1; 1663 linking_style = "dynamically"; 1664 break; 1665 case PT_NOTE: 1666 if (sh_num) /* Did this through section headers */ 1667 continue; 1668 if (((align = xph_align) & 0x80000000UL) != 0 || 1669 align < 4) { 1670 if (file_printf(ms, 1671 ", invalid note alignment %#lx", 1672 CAST(unsigned long, align)) == -1) 1673 return -1; 1674 align = 4; 1675 } 1676 /*FALLTHROUGH*/ 1677 case PT_INTERP: 1678 doread = 1; 1679 break; 1680 default: 1681 doread = 0; 1682 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1683 /* Maybe warn here? */ 1684 continue; 1685 } 1686 break; 1687 } 1688 1689 if (doread) { 1690 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1691 : sizeof(nbuf); 1692 bufsize = pread(fd, nbuf, len, xph_offset); 1693 if (bufsize == -1) { 1694 file_badread(ms); 1695 return -1; 1696 } 1697 } else 1698 len = 0; 1699 1700 /* Things we can determine when we seek */ 1701 switch (xph_type) { 1702 case PT_DYNAMIC: 1703 offset = 0; 1704 // Let DF_1 determine if we are PIE or not. 1705 ms->mode &= ~0111; 1706 for (;;) { 1707 if (offset >= CAST(size_t, bufsize)) 1708 break; 1709 offset = dodynamic(ms, nbuf, offset, 1710 CAST(size_t, bufsize), clazz, swap); 1711 if (offset == 0) 1712 break; 1713 } 1714 if (ms->flags & MAGIC_MIME) 1715 continue; 1716 break; 1717 1718 case PT_INTERP: 1719 if (ms->flags & MAGIC_MIME) 1720 continue; 1721 if (bufsize && nbuf[0]) { 1722 nbuf[bufsize - 1] = '\0'; 1723 memcpy(interp, nbuf, CAST(size_t, bufsize)); 1724 } else 1725 strlcpy(interp, "*empty*", sizeof(interp)); 1726 break; 1727 case PT_NOTE: 1728 if (ms->flags & MAGIC_MIME) 1729 return 0; 1730 /* 1731 * This is a PT_NOTE section; loop through all the notes 1732 * in the section. 1733 */ 1734 offset = 0; 1735 for (;;) { 1736 if (offset >= CAST(size_t, bufsize)) 1737 break; 1738 offset = donote(ms, nbuf, offset, 1739 CAST(size_t, bufsize), clazz, swap, align, 1740 flags, notecount, fd, 0, 0, 0); 1741 if (offset == 0) 1742 break; 1743 } 1744 break; 1745 default: 1746 if (ms->flags & MAGIC_MIME) 1747 continue; 1748 break; 1749 } 1750 } 1751 if (ms->flags & MAGIC_MIME) 1752 return 0; 1753 if (file_printf(ms, ", %s linked", linking_style) 1754 == -1) 1755 return -1; 1756 if (interp[0]) 1757 if (file_printf(ms, ", interpreter %s", 1758 file_printable(ibuf, sizeof(ibuf), interp, sizeof(interp))) 1759 == -1) 1760 return -1; 1761 return 0; 1762 } 1763 1764 1765 protected int 1766 file_tryelf(struct magic_set *ms, const struct buffer *b) 1767 { 1768 int fd = b->fd; 1769 const unsigned char *buf = CAST(const unsigned char *, b->fbuf); 1770 size_t nbytes = b->flen; 1771 union { 1772 int32_t l; 1773 char c[sizeof(int32_t)]; 1774 } u; 1775 int clazz; 1776 int swap; 1777 struct stat st; 1778 const struct stat *stp; 1779 off_t fsize; 1780 int flags = 0; 1781 Elf32_Ehdr elf32hdr; 1782 Elf64_Ehdr elf64hdr; 1783 uint16_t type, phnum, shnum, notecount; 1784 1785 if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION)) 1786 return 0; 1787 /* 1788 * ELF executables have multiple section headers in arbitrary 1789 * file locations and thus file(1) cannot determine it from easily. 1790 * Instead we traverse thru all section headers until a symbol table 1791 * one is found or else the binary is stripped. 1792 * Return immediately if it's not ELF (so we avoid pipe2file unless 1793 * needed). 1794 */ 1795 if (buf[EI_MAG0] != ELFMAG0 1796 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1797 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1798 return 0; 1799 1800 /* 1801 * If we cannot seek, it must be a pipe, socket or fifo. 1802 */ 1803 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) 1804 && (errno == ESPIPE)) 1805 fd = file_pipe2file(ms, fd, buf, nbytes); 1806 1807 if (fd == -1) { 1808 file_badread(ms); 1809 return -1; 1810 } 1811 1812 stp = &b->st; 1813 /* 1814 * b->st.st_size != 0 if previous fstat() succeeded, 1815 * which is likely, we can avoid extra stat() call. 1816 */ 1817 if (b->st.st_size == 0) { 1818 stp = &st; 1819 if (fstat(fd, &st) == -1) { 1820 file_badread(ms); 1821 return -1; 1822 } 1823 } 1824 if (S_ISREG(stp->st_mode) || stp->st_size != 0) 1825 fsize = stp->st_size; 1826 else 1827 fsize = SIZE_UNKNOWN; 1828 1829 clazz = buf[EI_CLASS]; 1830 1831 switch (clazz) { 1832 case ELFCLASS32: 1833 #undef elf_getu 1834 #define elf_getu(a, b) elf_getu32(a, b) 1835 #undef elfhdr 1836 #define elfhdr elf32hdr 1837 #include "elfclass.h" 1838 case ELFCLASS64: 1839 #undef elf_getu 1840 #define elf_getu(a, b) elf_getu64(a, b) 1841 #undef elfhdr 1842 #define elfhdr elf64hdr 1843 #include "elfclass.h" 1844 default: 1845 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1846 return -1; 1847 break; 1848 } 1849 return 0; 1850 } 1851 #endif 1852