1/* $NetBSD: readelf.c,v 1.27 2023/08/18 19:00:11 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 33FILE_RCSID("@(#)$File: readelf.c,v 1.190 2023/07/27 19:39:06 christos Exp $") 34#else 35__RCSID("$NetBSD: readelf.c,v 1.27 2023/08/18 19:00:11 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 51file_private int dophn_core(struct magic_set *, int, int, int, off_t, int, 52 size_t, off_t, int *, uint16_t *); 53#endif 54file_private int dophn_exec(struct magic_set *, int, int, int, off_t, int, 55 size_t, off_t, int, int *, uint16_t *); 56file_private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, 57 off_t, int, int, int *, uint16_t *); 58file_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 65file_private uint16_t getu16(int, uint16_t); 66file_private uint32_t getu32(int, uint32_t); 67file_private uint64_t getu64(int, uint64_t); 68 69#define SIZE_UNKNOWN CAST(off_t, -1) 70 71file_private int 72toomany(struct magic_set *ms, const char *name, uint16_t num) 73{ 74 if (ms->flags & MAGIC_MIME) 75 return 1; 76 if (file_printf(ms, ", too many %s (%u)", name, num) == -1) 77 return -1; 78 return 1; 79} 80 81file_private uint16_t 82getu16(int swap, uint16_t value) 83{ 84 union { 85 uint16_t ui; 86 char c[2]; 87 } retval, tmpval; 88 89 if (swap) { 90 tmpval.ui = value; 91 92 retval.c[0] = tmpval.c[1]; 93 retval.c[1] = tmpval.c[0]; 94 95 return retval.ui; 96 } else 97 return value; 98} 99 100file_private uint32_t 101getu32(int swap, uint32_t value) 102{ 103 union { 104 uint32_t ui; 105 char c[4]; 106 } retval, tmpval; 107 108 if (swap) { 109 tmpval.ui = value; 110 111 retval.c[0] = tmpval.c[3]; 112 retval.c[1] = tmpval.c[2]; 113 retval.c[2] = tmpval.c[1]; 114 retval.c[3] = tmpval.c[0]; 115 116 return retval.ui; 117 } else 118 return value; 119} 120 121file_private uint64_t 122getu64(int swap, uint64_t value) 123{ 124 union { 125 uint64_t ui; 126 char c[8]; 127 } retval, tmpval; 128 129 if (swap) { 130 tmpval.ui = value; 131 132 retval.c[0] = tmpval.c[7]; 133 retval.c[1] = tmpval.c[6]; 134 retval.c[2] = tmpval.c[5]; 135 retval.c[3] = tmpval.c[4]; 136 retval.c[4] = tmpval.c[3]; 137 retval.c[5] = tmpval.c[2]; 138 retval.c[6] = tmpval.c[1]; 139 retval.c[7] = tmpval.c[0]; 140 141 return retval.ui; 142 } else 143 return value; 144} 145 146#define elf_getu16(swap, value) getu16(swap, value) 147#define elf_getu32(swap, value) getu32(swap, value) 148#define elf_getu64(swap, value) getu64(swap, value) 149 150#define xsh_addr (clazz == ELFCLASS32 \ 151 ? CAST(void *, &sh32) \ 152 : CAST(void *, &sh64)) 153#define xsh_sizeof (clazz == ELFCLASS32 \ 154 ? sizeof(sh32) \ 155 : sizeof(sh64)) 156#define xsh_size CAST(size_t, (clazz == ELFCLASS32 \ 157 ? elf_getu32(swap, sh32.sh_size) \ 158 : elf_getu64(swap, sh64.sh_size))) 159#define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \ 160 ? elf_getu32(swap, sh32.sh_offset) \ 161 : elf_getu64(swap, sh64.sh_offset))) 162#define xsh_type (clazz == ELFCLASS32 \ 163 ? elf_getu32(swap, sh32.sh_type) \ 164 : elf_getu32(swap, sh64.sh_type)) 165#define xsh_name (clazz == ELFCLASS32 \ 166 ? elf_getu32(swap, sh32.sh_name) \ 167 : elf_getu32(swap, sh64.sh_name)) 168 169#define xph_addr (clazz == ELFCLASS32 \ 170 ? CAST(void *, &ph32) \ 171 : CAST(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 CAST(off_t, (clazz == ELFCLASS32 \ 179 ? elf_getu32(swap, ph32.p_offset) \ 180 : elf_getu64(swap, ph64.p_offset))) 181#define xph_align CAST(size_t, (clazz == ELFCLASS32 \ 182 ? CAST(off_t, (ph32.p_align ? \ 183 elf_getu32(swap, ph32.p_align) : 4))\ 184 : CAST(off_t, (ph64.p_align ? \ 185 elf_getu64(swap, ph64.p_align) : 4)))) 186#define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \ 187 ? CAST(off_t, (ph32.p_vaddr ? \ 188 elf_getu32(swap, ph32.p_vaddr) : 4))\ 189 : CAST(off_t, (ph64.p_vaddr ? \ 190 elf_getu64(swap, ph64.p_vaddr) : 4)))) 191#define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \ 192 ? elf_getu32(swap, ph32.p_filesz) \ 193 : elf_getu64(swap, ph64.p_filesz))) 194#define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \ 195 ? elf_getu32(swap, ph32.p_memsz) \ 196 : elf_getu64(swap, ph64.p_memsz)))) 197#define xnh_addr (clazz == ELFCLASS32 \ 198 ? CAST(void *, &nh32) \ 199 : CAST(void *, &nh64)) 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)) 212 213#define xdh_addr (clazz == ELFCLASS32 \ 214 ? CAST(void *, &dh32) \ 215 : CAST(void *, &dh64)) 216#define xdh_sizeof (clazz == ELFCLASS32 \ 217 ? sizeof(dh32) \ 218 : sizeof(dh64)) 219#define xdh_tag (clazz == ELFCLASS32 \ 220 ? elf_getu32(swap, dh32.d_tag) \ 221 : elf_getu64(swap, dh64.d_tag)) 222#define xdh_val (clazz == ELFCLASS32 \ 223 ? elf_getu32(swap, dh32.d_un.d_val) \ 224 : elf_getu64(swap, dh64.d_un.d_val)) 225 226#define xcap_addr (clazz == ELFCLASS32 \ 227 ? CAST(void *, &cap32) \ 228 : CAST(void *, &cap64)) 229#define xcap_sizeof (clazz == ELFCLASS32 \ 230 ? sizeof(cap32) \ 231 : sizeof(cap64)) 232#define xcap_tag (clazz == ELFCLASS32 \ 233 ? elf_getu32(swap, cap32.c_tag) \ 234 : elf_getu64(swap, cap64.c_tag)) 235#define xcap_val (clazz == ELFCLASS32 \ 236 ? elf_getu32(swap, cap32.c_un.c_val) \ 237 : elf_getu64(swap, cap64.c_un.c_val)) 238 239#define xauxv_addr (clazz == ELFCLASS32 \ 240 ? CAST(void *, &auxv32) \ 241 : CAST(void *, &auxv64)) 242#define xauxv_sizeof (clazz == ELFCLASS32 \ 243 ? sizeof(auxv32) \ 244 : sizeof(auxv64)) 245#define xauxv_type (clazz == ELFCLASS32 \ 246 ? elf_getu32(swap, auxv32.a_type) \ 247 : elf_getu64(swap, auxv64.a_type)) 248#define xauxv_val (clazz == ELFCLASS32 \ 249 ? elf_getu32(swap, auxv32.a_v) \ 250 : elf_getu64(swap, auxv64.a_v)) 251 252#define prpsoffsets(i) (clazz == ELFCLASS32 \ 253 ? prpsoffsets32[i] \ 254 : prpsoffsets64[i]) 255 256#ifdef ELFCORE 257/* 258 * Try larger offsets first to avoid false matches 259 * from earlier data that happen to look like strings. 260 */ 261static const size_t prpsoffsets32[] = { 262#ifdef USE_NT_PSINFO 263 104, /* SunOS 5.x (command line) */ 264 88, /* SunOS 5.x (short name) */ 265#endif /* USE_NT_PSINFO */ 266 267 100, /* SunOS 5.x (command line) */ 268 84, /* SunOS 5.x (short name) */ 269 270 44, /* Linux (command line) */ 271 28, /* Linux (short name) */ 272 273 48, /* Linux PowerPC (command line) */ 274 32, /* Linux PowerPC (short name) */ 275 276 8, /* FreeBSD */ 277}; 278 279static const size_t prpsoffsets64[] = { 280#ifdef USE_NT_PSINFO 281 152, /* SunOS 5.x (command line) */ 282 136, /* SunOS 5.x (short name) */ 283#endif /* USE_NT_PSINFO */ 284 285 136, /* SunOS 5.x, 64-bit (command line) */ 286 120, /* SunOS 5.x, 64-bit (short name) */ 287 288 56, /* Linux (command line) */ 289 40, /* Linux (tested on core from 2.4.x, short name) */ 290 291 16, /* FreeBSD, 64-bit */ 292}; 293 294#define NOFFSETS32 __arraycount(prpsoffsets32) 295#define NOFFSETS64 __arraycount(prpsoffsets64) 296 297#define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 298 299/* 300 * Look through the program headers of an executable image, searching 301 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 302 * "FreeBSD"; if one is found, try looking in various places in its 303 * contents for a 16-character string containing only printable 304 * characters - if found, that string should be the name of the program 305 * that dropped core. Note: right after that 16-character string is, 306 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 307 * Linux, a longer string (80 characters, in 5.x, probably other 308 * SVR4-flavored systems, and Linux) containing the start of the 309 * command line for that program. 310 * 311 * SunOS 5.x core files contain two PT_NOTE sections, with the types 312 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 313 * same info about the command name and command line, so it probably 314 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 315 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 316 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 317 * the SunOS 5.x file command relies on this (and prefers the latter). 318 * 319 * The signal number probably appears in a section of type NT_PRSTATUS, 320 * but that's also rather OS-dependent, in ways that are harder to 321 * dissect with heuristics, so I'm not bothering with the signal number. 322 * (I suppose the signal number could be of interest in situations where 323 * you don't have the binary of the program that dropped core; if you 324 * *do* have that binary, the debugger will probably tell you what 325 * signal it was.) 326 */ 327 328#define OS_STYLE_SVR4 0 329#define OS_STYLE_FREEBSD 1 330#define OS_STYLE_NETBSD 2 331 332file_private const char os_style_names[][8] = { 333 "SVR4", 334 "FreeBSD", 335 "NetBSD", 336}; 337 338#define FLAGS_CORE_STYLE 0x0003 339 340#define FLAGS_DID_CORE 0x0004 341#define FLAGS_DID_OS_NOTE 0x0008 342#define FLAGS_DID_BUILD_ID 0x0010 343#define FLAGS_DID_CORE_STYLE 0x0020 344#define FLAGS_DID_NETBSD_PAX 0x0040 345#define FLAGS_DID_NETBSD_MARCH 0x0080 346#define FLAGS_DID_NETBSD_CMODEL 0x0100 347#define FLAGS_DID_NETBSD_EMULATION 0x0200 348#define FLAGS_DID_NETBSD_UNKNOWN 0x0400 349#define FLAGS_IS_CORE 0x0800 350#define FLAGS_DID_AUXV 0x1000 351 352file_private int 353dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 354 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 355{ 356 Elf32_Phdr ph32; 357 Elf64_Phdr ph64; 358 size_t offset, len; 359 unsigned char nbuf[BUFSIZ]; 360 ssize_t bufsize; 361 off_t ph_off = off, offs; 362 int ph_num = num; 363 364 if (ms->flags & MAGIC_MIME) 365 return 0; 366 367 if (num == 0) { 368 if (file_printf(ms, ", no program header") == -1) 369 return -1; 370 return 0; 371 } 372 if (size != xph_sizeof) { 373 if (file_printf(ms, ", corrupted program header size") == -1) 374 return -1; 375 return 0; 376 } 377 378 /* 379 * Loop through all the program headers. 380 */ 381 for ( ; num; num--) { 382 if (pread(fd, xph_addr, xph_sizeof, off) < 383 CAST(ssize_t, xph_sizeof)) { 384 if (file_printf(ms, 385 ", can't read elf program headers at %jd", 386 (intmax_t)off) == -1) 387 return -1; 388 return 0; 389 } 390 off += size; 391 392 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 393 /* Perhaps warn here */ 394 continue; 395 } 396 397 if (xph_type != PT_NOTE) 398 continue; 399 400 /* 401 * This is a PT_NOTE section; loop through all the notes 402 * in the section. 403 */ 404 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 405 offs = xph_offset; 406 if ((bufsize = pread(fd, nbuf, len, offs)) == -1) { 407 if (file_printf(ms, " can't read note section at %jd", 408 (intmax_t)offs) == -1) 409 return -1; 410 return 0; 411 } 412 offset = 0; 413 for (;;) { 414 if (offset >= CAST(size_t, bufsize)) 415 break; 416 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize), 417 clazz, swap, 4, flags, notecount, fd, ph_off, 418 ph_num, fsize); 419 if (offset == 0) 420 break; 421 422 } 423 } 424 return 0; 425} 426#endif 427 428static int 429do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 430{ 431 uint32_t desc; 432 memcpy(&desc, v, sizeof(desc)); 433 desc = elf_getu32(swap, desc); 434 435 if (file_printf(ms, ", for NetBSD") == -1) 436 return -1; 437 /* 438 * The version number used to be stuck as 199905, and was thus 439 * basically content-free. Newer versions of NetBSD have fixed 440 * this and now use the encoding of __NetBSD_Version__: 441 * 442 * MMmmrrpp00 443 * 444 * M = major version 445 * m = minor version 446 * r = release ["",A-Z,Z[A-Z] but numeric] 447 * p = patchlevel 448 */ 449 if (desc > 100000000U) { 450 uint32_t ver_patch = (desc / 100) % 100; 451 uint32_t ver_rel = (desc / 10000) % 100; 452 uint32_t ver_min = (desc / 1000000) % 100; 453 uint32_t ver_maj = desc / 100000000; 454 455 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 456 return -1; 457 if (ver_maj >= 9) { 458 ver_patch += 100 * ver_rel; 459 ver_rel = 0; 460 } 461 if (ver_rel == 0 && ver_patch != 0) { 462 if (file_printf(ms, ".%u", ver_patch) == -1) 463 return -1; 464 } else if (ver_rel != 0) { 465 while (ver_rel > 26) { 466 if (file_printf(ms, "Z") == -1) 467 return -1; 468 ver_rel -= 26; 469 } 470 if (file_printf(ms, "%c", 'A' + ver_rel - 1) == -1) 471 return -1; 472 } 473 } 474 return 0; 475} 476 477static int 478do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 479{ 480 uint32_t desc; 481 482 memcpy(&desc, v, sizeof(desc)); 483 desc = elf_getu32(swap, desc); 484 if (file_printf(ms, ", for FreeBSD") == -1) 485 return -1; 486 487 /* 488 * Contents is __FreeBSD_version, whose relation to OS 489 * versions is defined by a huge table in the Porter's 490 * Handbook. This is the general scheme: 491 * 492 * Releases: 493 * Mmp000 (before 4.10) 494 * Mmi0p0 (before 5.0) 495 * Mmm0p0 496 * 497 * Development branches: 498 * Mmpxxx (before 4.6) 499 * Mmp1xx (before 4.10) 500 * Mmi1xx (before 5.0) 501 * M000xx (pre-M.0) 502 * Mmm1xx 503 * 504 * M = major version 505 * m = minor version 506 * i = minor version increment (491000 -> 4.10) 507 * p = patchlevel 508 * x = revision 509 * 510 * The first release of FreeBSD to use ELF by default 511 * was version 3.0. 512 */ 513 if (desc == 460002) { 514 if (file_printf(ms, " 4.6.2") == -1) 515 return -1; 516 } else if (desc < 460100) { 517 if (file_printf(ms, " %d.%d", desc / 100000, 518 desc / 10000 % 10) == -1) 519 return -1; 520 if (desc / 1000 % 10 > 0) 521 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 522 return -1; 523 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 524 if (file_printf(ms, " (%d)", desc) == -1) 525 return -1; 526 } else if (desc < 500000) { 527 if (file_printf(ms, " %d.%d", desc / 100000, 528 desc / 10000 % 10 + desc / 1000 % 10) == -1) 529 return -1; 530 if (desc / 100 % 10 > 0) { 531 if (file_printf(ms, " (%d)", desc) == -1) 532 return -1; 533 } else if (desc / 10 % 10 > 0) { 534 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 535 return -1; 536 } 537 } else { 538 if (file_printf(ms, " %d.%d", desc / 100000, 539 desc / 1000 % 100) == -1) 540 return -1; 541 if ((desc / 100 % 10 > 0) || 542 (desc % 100000 / 100 == 0)) { 543 if (file_printf(ms, " (%d)", desc) == -1) 544 return -1; 545 } else if (desc / 10 % 10 > 0) { 546 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 547 return -1; 548 } 549 } 550 return 0; 551} 552 553file_private int 554/*ARGSUSED*/ 555do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 556 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 557 size_t noff, size_t doff, int *flags) 558{ 559 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 && 560 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) { 561 uint8_t desc[20]; 562 const char *btype; 563 uint32_t i; 564 *flags |= FLAGS_DID_BUILD_ID; 565 switch (descsz) { 566 case 8: 567 btype = "xxHash"; 568 break; 569 case 16: 570 btype = "md5/uuid"; 571 break; 572 case 20: 573 btype = "sha1"; 574 break; 575 default: 576 btype = "unknown"; 577 break; 578 } 579 if (file_printf(ms, ", BuildID[%s]=", btype) == -1) 580 return -1; 581 memcpy(desc, &nbuf[doff], descsz); 582 for (i = 0; i < descsz; i++) 583 if (file_printf(ms, "%02x", desc[i]) == -1) 584 return -1; 585 return 1; 586 } 587 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 && 588 type == NT_GO_BUILD_ID && descsz < 128) { 589 char buf[256]; 590 if (file_printf(ms, ", Go BuildID=%s", 591 file_copystr(buf, sizeof(buf), descsz, 592 RCAST(const char *, &nbuf[doff]))) == -1) 593 return -1; 594 return 1; 595 } 596 return 0; 597} 598 599file_private int 600do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 601 int swap, uint32_t namesz, uint32_t descsz, 602 size_t noff, size_t doff, int *flags) 603{ 604 const char *name = RCAST(const char *, &nbuf[noff]); 605 606 if (namesz == 5 && strcmp(name, "SuSE") == 0 && 607 type == NT_GNU_VERSION && descsz == 2) { 608 *flags |= FLAGS_DID_OS_NOTE; 609 if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff], 610 nbuf[doff + 1]) == -1) 611 return -1; 612 return 1; 613 } 614 615 if (namesz == 4 && strcmp(name, "GNU") == 0 && 616 type == NT_GNU_VERSION && descsz == 16) { 617 uint32_t desc[4]; 618 memcpy(desc, &nbuf[doff], sizeof(desc)); 619 620 *flags |= FLAGS_DID_OS_NOTE; 621 if (file_printf(ms, ", for GNU/") == -1) 622 return -1; 623 switch (elf_getu32(swap, desc[0])) { 624 case GNU_OS_LINUX: 625 if (file_printf(ms, "Linux") == -1) 626 return -1; 627 break; 628 case GNU_OS_HURD: 629 if (file_printf(ms, "Hurd") == -1) 630 return -1; 631 break; 632 case GNU_OS_SOLARIS: 633 if (file_printf(ms, "Solaris") == -1) 634 return -1; 635 break; 636 case GNU_OS_KFREEBSD: 637 if (file_printf(ms, "kFreeBSD") == -1) 638 return -1; 639 break; 640 case GNU_OS_KNETBSD: 641 if (file_printf(ms, "kNetBSD") == -1) 642 return -1; 643 break; 644 default: 645 if (file_printf(ms, "<unknown>") == -1) 646 return -1; 647 } 648 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 649 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 650 return -1; 651 return 1; 652 } 653 654 if (namesz == 7 && strcmp(name, "NetBSD") == 0) { 655 if (type == NT_NETBSD_VERSION && descsz == 4) { 656 *flags |= FLAGS_DID_OS_NOTE; 657 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1) 658 return -1; 659 return 1; 660 } 661 } 662 663 if (namesz == 8 && strcmp(name, "FreeBSD") == 0) { 664 if (type == NT_FREEBSD_VERSION && descsz == 4) { 665 *flags |= FLAGS_DID_OS_NOTE; 666 if (do_note_freebsd_version(ms, swap, &nbuf[doff]) 667 == -1) 668 return -1; 669 return 1; 670 } 671 } 672 673 if (namesz == 8 && strcmp(name, "OpenBSD") == 0 && 674 type == NT_OPENBSD_VERSION && descsz == 4) { 675 *flags |= FLAGS_DID_OS_NOTE; 676 if (file_printf(ms, ", for OpenBSD") == -1) 677 return -1; 678 /* Content of note is always 0 */ 679 return 1; 680 } 681 682 if (namesz == 10 && strcmp(name, "DragonFly") == 0 && 683 type == NT_DRAGONFLY_VERSION && descsz == 4) { 684 uint32_t desc; 685 *flags |= FLAGS_DID_OS_NOTE; 686 if (file_printf(ms, ", for DragonFly") == -1) 687 return -1; 688 memcpy(&desc, &nbuf[doff], sizeof(desc)); 689 desc = elf_getu32(swap, desc); 690 if (file_printf(ms, " %d.%d.%d", desc / 100000, 691 desc / 10000 % 10, desc % 10000) == -1) 692 return -1; 693 return 1; 694 } 695 return 0; 696} 697 698file_private int 699do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 700 int swap, uint32_t namesz, uint32_t descsz, 701 size_t noff, size_t doff, int *flags) 702{ 703 const char *name = RCAST(const char *, &nbuf[noff]); 704 705 if (namesz == 4 && strcmp(name, "PaX") == 0 && 706 type == NT_NETBSD_PAX && descsz == 4) { 707 static const char *pax[] = { 708 "+mprotect", 709 "-mprotect", 710 "+segvguard", 711 "-segvguard", 712 "+ASLR", 713 "-ASLR", 714 }; 715 uint32_t desc; 716 size_t i; 717 int did = 0; 718 719 *flags |= FLAGS_DID_NETBSD_PAX; 720 memcpy(&desc, &nbuf[doff], sizeof(desc)); 721 desc = elf_getu32(swap, desc); 722 723 if (desc && file_printf(ms, ", PaX: ") == -1) 724 return -1; 725 726 for (i = 0; i < __arraycount(pax); i++) { 727 if (((1 << CAST(int, i)) & desc) == 0) 728 continue; 729 if (file_printf(ms, "%s%s", did++ ? "," : "", 730 pax[i]) == -1) 731 return -1; 732 } 733 return 1; 734 } 735 return 0; 736} 737 738file_private int 739do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 740 int swap, uint32_t namesz, uint32_t descsz, 741 size_t noff, size_t doff, int *flags, size_t size, int clazz) 742{ 743#ifdef ELFCORE 744 char buf[256]; 745 const char *name = RCAST(const char *, &nbuf[noff]); 746 747 int os_style = -1; 748 /* 749 * Sigh. The 2.0.36 kernel in Debian 2.1, at 750 * least, doesn't correctly implement name 751 * sections, in core dumps, as specified by 752 * the "Program Linking" section of "UNIX(R) System 753 * V Release 4 Programmer's Guide: ANSI C and 754 * Programming Support Tools", because my copy 755 * clearly says "The first 'namesz' bytes in 'name' 756 * contain a *null-terminated* [emphasis mine] 757 * character representation of the entry's owner 758 * or originator", but the 2.0.36 kernel code 759 * doesn't include the terminating null in the 760 * name.... 761 */ 762 if ((namesz == 4 && strncmp(name, "CORE", 4) == 0) || 763 (namesz == 5 && strcmp(name, "CORE") == 0)) { 764 os_style = OS_STYLE_SVR4; 765 } 766 767 if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) { 768 os_style = OS_STYLE_FREEBSD; 769 } 770 771 if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11) 772 == 0)) { 773 os_style = OS_STYLE_NETBSD; 774 } 775 776 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 777 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 778 == -1) 779 return -1; 780 *flags |= FLAGS_DID_CORE_STYLE; 781 *flags |= os_style; 782 } 783 784 switch (os_style) { 785 case OS_STYLE_NETBSD: 786 if (type == NT_NETBSD_CORE_PROCINFO) { 787 char sbuf[512]; 788 struct NetBSD_elfcore_procinfo pi; 789 memset(&pi, 0, sizeof(pi)); 790 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi))); 791 792 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, " 793 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)", 794 file_printable(ms, sbuf, sizeof(sbuf), 795 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)), 796 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)), 797 elf_getu32(swap, pi.cpi_euid), 798 elf_getu32(swap, pi.cpi_egid), 799 elf_getu32(swap, pi.cpi_nlwps), 800 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)), 801 elf_getu32(swap, pi.cpi_signo), 802 elf_getu32(swap, pi.cpi_sigcode)) == -1) 803 return -1; 804 805 *flags |= FLAGS_DID_CORE; 806 return 1; 807 } 808 break; 809 810 case OS_STYLE_FREEBSD: 811 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 812 size_t argoff, pidoff; 813 814 if (clazz == ELFCLASS32) 815 argoff = 4 + 4 + 17; 816 else 817 argoff = 4 + 4 + 8 + 17; 818 if (file_printf(ms, ", from '%.80s'", nbuf + doff + 819 argoff) == -1) 820 return -1; 821 pidoff = argoff + 81 + 2; 822 if (doff + pidoff + 4 <= size) { 823 if (file_printf(ms, ", pid=%u", 824 elf_getu32(swap, *RCAST(uint32_t *, (nbuf + 825 doff + pidoff)))) == -1) 826 return -1; 827 } 828 *flags |= FLAGS_DID_CORE; 829 } 830 break; 831 832 default: 833 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 834 size_t i, j; 835 unsigned char c; 836 /* 837 * Extract the program name. We assume 838 * it to be 16 characters (that's what it 839 * is in SunOS 5.x and Linux). 840 * 841 * Unfortunately, it's at a different offset 842 * in various OSes, so try multiple offsets. 843 * If the characters aren't all printable, 844 * reject it. 845 */ 846 for (i = 0; i < NOFFSETS; i++) { 847 unsigned char *cname, *cp; 848 size_t reloffset = prpsoffsets(i); 849 size_t noffset = doff + reloffset; 850 size_t k; 851 for (j = 0; j < 16; j++, noffset++, 852 reloffset++) { 853 /* 854 * Make sure we're not past 855 * the end of the buffer; if 856 * we are, just give up. 857 */ 858 if (noffset >= size) 859 goto tryanother; 860 861 /* 862 * Make sure we're not past 863 * the end of the contents; 864 * if we are, this obviously 865 * isn't the right offset. 866 */ 867 if (reloffset >= descsz) 868 goto tryanother; 869 870 c = nbuf[noffset]; 871 if (c == '\0') { 872 /* 873 * A '\0' at the 874 * beginning is 875 * obviously wrong. 876 * Any other '\0' 877 * means we're done. 878 */ 879 if (j == 0) 880 goto tryanother; 881 else 882 break; 883 } else { 884 /* 885 * A nonprintable 886 * character is also 887 * wrong. 888 */ 889 if (!isprint(c) || isquote(c)) 890 goto tryanother; 891 } 892 } 893 /* 894 * Well, that worked. 895 */ 896 897 /* 898 * Try next offsets, in case this match is 899 * in the middle of a string. 900 */ 901 for (k = i + 1 ; k < NOFFSETS; k++) { 902 size_t no; 903 int adjust = 1; 904 if (prpsoffsets(k) >= prpsoffsets(i)) 905 continue; 906 /* 907 * pr_fname == pr_psargs - 16 && 908 * non-nul-terminated fname (qemu) 909 */ 910 if (prpsoffsets(k) == 911 prpsoffsets(i) - 16 && j == 16) 912 continue; 913 for (no = doff + prpsoffsets(k); 914 no < doff + prpsoffsets(i); no++) 915 adjust = adjust 916 && isprint(nbuf[no]); 917 if (adjust) 918 i = k; 919 } 920 921 cname = CAST(unsigned char *, 922 &nbuf[doff + prpsoffsets(i)]); 923 for (cp = cname; cp < nbuf + size && *cp 924 && isprint(*cp); cp++) 925 continue; 926 /* 927 * Linux apparently appends a space at the end 928 * of the command line: remove it. 929 */ 930 while (cp > cname && isspace(cp[-1])) 931 cp--; 932 if (file_printf(ms, ", from '%s'", 933 file_copystr(buf, sizeof(buf), 934 CAST(size_t, cp - cname), 935 RCAST(char *, cname))) == -1) 936 return -1; 937 *flags |= FLAGS_DID_CORE; 938 return 1; 939 940 tryanother: 941 ; 942 } 943 } 944 break; 945 } 946#endif 947 return 0; 948} 949 950file_private off_t 951get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, 952 off_t off, int num, off_t fsize, uint64_t virtaddr) 953{ 954 Elf32_Phdr ph32; 955 Elf64_Phdr ph64; 956 957 /* 958 * Loop through all the program headers and find the header with 959 * virtual address in which the "virtaddr" belongs to. 960 */ 961 for ( ; num; num--) { 962 if (pread(fd, xph_addr, xph_sizeof, off) < 963 CAST(ssize_t, xph_sizeof)) { 964 if (file_printf(ms, 965 ", can't read elf program header at %jd", 966 (intmax_t)off) == -1) 967 return -1; 968 return 0; 969 970 } 971 off += xph_sizeof; 972 973 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 974 /* Perhaps warn here */ 975 continue; 976 } 977 978 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) 979 return xph_offset + (virtaddr - xph_vaddr); 980 } 981 return 0; 982} 983 984file_private size_t 985get_string_on_virtaddr(struct magic_set *ms, 986 int swap, int clazz, int fd, off_t ph_off, int ph_num, 987 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) 988{ 989 char *bptr; 990 off_t offset; 991 992 if (buflen == 0) 993 return 0; 994 995 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, 996 fsize, virtaddr); 997 if (offset < 0 || 998 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) { 999 (void)file_printf(ms, ", can't read elf string at %jd", 1000 (intmax_t)offset); 1001 return 0; 1002 } 1003 1004 buf[buflen - 1] = '\0'; 1005 1006 /* We expect only printable characters, so return if buffer contains 1007 * non-printable character before the '\0' or just '\0'. */ 1008 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++) 1009 continue; 1010 if (*bptr != '\0') 1011 return 0; 1012 1013 return bptr - buf; 1014} 1015 1016 1017/*ARGSUSED*/ 1018file_private int 1019do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 1020 int swap, uint32_t namesz __attribute__((__unused__)), 1021 uint32_t descsz __attribute__((__unused__)), 1022 size_t noff __attribute__((__unused__)), size_t doff, 1023 int *flags, size_t size __attribute__((__unused__)), int clazz, 1024 int fd, off_t ph_off, int ph_num, off_t fsize) 1025{ 1026#ifdef ELFCORE 1027 Aux32Info auxv32; 1028 Aux64Info auxv64; 1029 size_t elsize = xauxv_sizeof; 1030 const char *tag; 1031 int is_string; 1032 size_t nval, off; 1033 1034 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != 1035 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) 1036 return 0; 1037 1038 switch (*flags & FLAGS_CORE_STYLE) { 1039 case OS_STYLE_SVR4: 1040 if (type != NT_AUXV) 1041 return 0; 1042 break; 1043#ifdef notyet 1044 case OS_STYLE_NETBSD: 1045 if (type != NT_NETBSD_CORE_AUXV) 1046 return 0; 1047 break; 1048 case OS_STYLE_FREEBSD: 1049 if (type != NT_FREEBSD_PROCSTAT_AUXV) 1050 return 0; 1051 break; 1052#endif 1053 default: 1054 return 0; 1055 } 1056 1057 *flags |= FLAGS_DID_AUXV; 1058 1059 nval = 0; 1060 for (off = 0; off + elsize <= descsz; off += elsize) { 1061 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 1062 /* Limit processing to 50 vector entries to prevent DoS */ 1063 if (nval++ >= 50) { 1064 file_error(ms, 0, "Too many ELF Auxv elements"); 1065 return 1; 1066 } 1067 1068 switch(xauxv_type) { 1069 case AT_LINUX_EXECFN: 1070 is_string = 1; 1071 tag = "execfn"; 1072 break; 1073 case AT_LINUX_PLATFORM: 1074 is_string = 1; 1075 tag = "platform"; 1076 break; 1077 case AT_LINUX_UID: 1078 is_string = 0; 1079 tag = "real uid"; 1080 break; 1081 case AT_LINUX_GID: 1082 is_string = 0; 1083 tag = "real gid"; 1084 break; 1085 case AT_LINUX_EUID: 1086 is_string = 0; 1087 tag = "effective uid"; 1088 break; 1089 case AT_LINUX_EGID: 1090 is_string = 0; 1091 tag = "effective gid"; 1092 break; 1093 default: 1094 is_string = 0; 1095 tag = NULL; 1096 break; 1097 } 1098 1099 if (tag == NULL) 1100 continue; 1101 1102 if (is_string) { 1103 char buf[256]; 1104 ssize_t buflen; 1105 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 1106 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 1107 1108 if (buflen == 0) 1109 continue; 1110 1111 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 1112 return -1; 1113 } else { 1114 if (file_printf(ms, ", %s: %d", tag, 1115 CAST(int, xauxv_val)) == -1) 1116 return -1; 1117 } 1118 } 1119 return 1; 1120#else 1121 return 0; 1122#endif 1123} 1124 1125file_private size_t 1126dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1127 int clazz, int swap, int *pie, size_t *need) 1128{ 1129 Elf32_Dyn dh32; 1130 Elf64_Dyn dh64; 1131 unsigned char *dbuf = CAST(unsigned char *, vbuf); 1132 1133 if (xdh_sizeof + offset > size) { 1134 /* 1135 * We're out of note headers. 1136 */ 1137 return xdh_sizeof + offset; 1138 } 1139 1140 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof); 1141 offset += xdh_sizeof; 1142 1143 switch (xdh_tag) { 1144 case DT_FLAGS_1: 1145 *pie = 1; 1146 if (xdh_val & DF_1_PIE) 1147 ms->mode |= 0111; 1148 else 1149 ms->mode &= ~0111; 1150 break; 1151 case DT_NEEDED: 1152 (*need)++; 1153 break; 1154 default: 1155 break; 1156 } 1157 return offset; 1158} 1159 1160 1161file_private size_t 1162donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1163 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1164 int fd, off_t ph_off, int ph_num, off_t fsize) 1165{ 1166 Elf32_Nhdr nh32; 1167 Elf64_Nhdr nh64; 1168 size_t noff, doff; 1169 uint32_t namesz, descsz; 1170 char buf[256]; 1171 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1172 1173 if (*notecount == 0) 1174 return 0; 1175 --*notecount; 1176 1177 if (xnh_sizeof + offset > size) { 1178 /* 1179 * We're out of note headers. 1180 */ 1181 return xnh_sizeof + offset; 1182 } 1183 /*XXX: GCC */ 1184 memset(&nh32, 0, sizeof(nh32)); 1185 memset(&nh64, 0, sizeof(nh64)); 1186 1187 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1188 offset += xnh_sizeof; 1189 1190 namesz = xnh_namesz; 1191 descsz = xnh_descsz; 1192 1193 if ((namesz == 0) && (descsz == 0)) { 1194 /* 1195 * We're out of note headers. 1196 */ 1197 return (offset >= size) ? offset : size; 1198 } 1199 1200 if (namesz & 0x80000000) { 1201 (void)file_printf(ms, ", bad note name size %#lx", 1202 CAST(unsigned long, namesz)); 1203 return 0; 1204 } 1205 1206 if (descsz & 0x80000000) { 1207 (void)file_printf(ms, ", bad note description size %#lx", 1208 CAST(unsigned long, descsz)); 1209 return 0; 1210 } 1211 1212 noff = offset; 1213 doff = ELF_ALIGN(offset + namesz); 1214 1215 if (offset + namesz > size) { 1216 /* 1217 * We're past the end of the buffer. 1218 */ 1219 return doff; 1220 } 1221 1222 offset = ELF_ALIGN(doff + descsz); 1223 if (doff + descsz > size) { 1224 /* 1225 * We're past the end of the buffer. 1226 */ 1227 return (offset >= size) ? offset : size; 1228 } 1229 1230 1231 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1232 if (do_os_note(ms, nbuf, xnh_type, swap, 1233 namesz, descsz, noff, doff, flags)) 1234 return offset; 1235 } 1236 1237 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1238 if (do_bid_note(ms, nbuf, xnh_type, swap, 1239 namesz, descsz, noff, doff, flags)) 1240 return offset; 1241 } 1242 1243 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1244 if (do_pax_note(ms, nbuf, xnh_type, swap, 1245 namesz, descsz, noff, doff, flags)) 1246 return offset; 1247 } 1248 1249 if ((*flags & FLAGS_DID_CORE) == 0) { 1250 if (do_core_note(ms, nbuf, xnh_type, swap, 1251 namesz, descsz, noff, doff, flags, size, clazz)) 1252 return offset; 1253 } 1254 1255 if ((*flags & FLAGS_DID_AUXV) == 0) { 1256 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1257 namesz, descsz, noff, doff, flags, size, clazz, 1258 fd, ph_off, ph_num, fsize)) 1259 return offset; 1260 } 1261 1262 if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) { 1263 int descw, flag; 1264 const char *str, *tag; 1265 if (descsz > 100) 1266 descsz = 100; 1267 switch (xnh_type) { 1268 case NT_NETBSD_VERSION: 1269 return offset; 1270 case NT_NETBSD_MARCH: 1271 flag = FLAGS_DID_NETBSD_MARCH; 1272 tag = "compiled for"; 1273 break; 1274 case NT_NETBSD_CMODEL: 1275 flag = FLAGS_DID_NETBSD_CMODEL; 1276 tag = "compiler model"; 1277 break; 1278 case NT_NETBSD_EMULATION: 1279 flag = FLAGS_DID_NETBSD_EMULATION; 1280 tag = "emulation:"; 1281 break; 1282 default: 1283 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1284 return offset; 1285 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1286 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1287 return offset; 1288 return offset; 1289 } 1290 1291 if (*flags & flag) 1292 return offset; 1293 str = RCAST(const char *, &nbuf[doff]); 1294 descw = CAST(int, descsz); 1295 *flags |= flag; 1296 file_printf(ms, ", %s: %s", tag, 1297 file_copystr(buf, sizeof(buf), descw, str)); 1298 return offset; 1299 } 1300 1301 return offset; 1302} 1303 1304/* SunOS 5.x hardware capability descriptions */ 1305typedef struct cap_desc { 1306 uint64_t cd_mask; 1307 const char *cd_name; 1308} cap_desc_t; 1309 1310static const cap_desc_t cap_desc_sparc[] = { 1311 { AV_SPARC_MUL32, "MUL32" }, 1312 { AV_SPARC_DIV32, "DIV32" }, 1313 { AV_SPARC_FSMULD, "FSMULD" }, 1314 { AV_SPARC_V8PLUS, "V8PLUS" }, 1315 { AV_SPARC_POPC, "POPC" }, 1316 { AV_SPARC_VIS, "VIS" }, 1317 { AV_SPARC_VIS2, "VIS2" }, 1318 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1319 { AV_SPARC_FMAF, "FMAF" }, 1320 { AV_SPARC_FJFMAU, "FJFMAU" }, 1321 { AV_SPARC_IMA, "IMA" }, 1322 { 0, NULL } 1323}; 1324 1325static const cap_desc_t cap_desc_386[] = { 1326 { AV_386_FPU, "FPU" }, 1327 { AV_386_TSC, "TSC" }, 1328 { AV_386_CX8, "CX8" }, 1329 { AV_386_SEP, "SEP" }, 1330 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1331 { AV_386_CMOV, "CMOV" }, 1332 { AV_386_MMX, "MMX" }, 1333 { AV_386_AMD_MMX, "AMD_MMX" }, 1334 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1335 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1336 { AV_386_FXSR, "FXSR" }, 1337 { AV_386_SSE, "SSE" }, 1338 { AV_386_SSE2, "SSE2" }, 1339 { AV_386_PAUSE, "PAUSE" }, 1340 { AV_386_SSE3, "SSE3" }, 1341 { AV_386_MON, "MON" }, 1342 { AV_386_CX16, "CX16" }, 1343 { AV_386_AHF, "AHF" }, 1344 { AV_386_TSCP, "TSCP" }, 1345 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1346 { AV_386_POPCNT, "POPCNT" }, 1347 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1348 { AV_386_SSSE3, "SSSE3" }, 1349 { AV_386_SSE4_1, "SSE4.1" }, 1350 { AV_386_SSE4_2, "SSE4.2" }, 1351 { 0, NULL } 1352}; 1353 1354file_private int 1355doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1356 size_t size, off_t fsize, int mach, int strtab, int *flags, 1357 uint16_t *notecount) 1358{ 1359 Elf32_Shdr sh32; 1360 Elf64_Shdr sh64; 1361 int stripped = 1, has_debug_info = 0; 1362 size_t nbadcap = 0; 1363 void *nbuf; 1364 off_t noff, coff, name_off, offs; 1365 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ 1366 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ 1367 char name[50]; 1368 ssize_t namesize; 1369 1370 if (ms->flags & MAGIC_MIME) 1371 return 0; 1372 1373 if (num == 0) { 1374 if (file_printf(ms, ", no section header") == -1) 1375 return -1; 1376 return 0; 1377 } 1378 if (size != xsh_sizeof) { 1379 if (file_printf(ms, ", corrupted section header size") == -1) 1380 return -1; 1381 return 0; 1382 } 1383 1384 /* Read offset of name section to be able to read section names later */ 1385 offs = CAST(off_t, (off + size * strtab)); 1386 if (pread(fd, xsh_addr, xsh_sizeof, offs) < CAST(ssize_t, xsh_sizeof)) { 1387 if (file_printf(ms, ", missing section headers at %jd", 1388 (intmax_t)offs) == -1) 1389 return -1; 1390 return 0; 1391 } 1392 name_off = xsh_offset; 1393 1394 if (fsize != SIZE_UNKNOWN && fsize < name_off) { 1395 if (file_printf(ms, ", too large section header offset %jd", 1396 (intmax_t)name_off) == -1) 1397 return -1; 1398 return 0; 1399 } 1400 1401 for ( ; num; num--) { 1402 /* Read the name of this section. */ 1403 offs = name_off + xsh_name; 1404 if ((namesize = pread(fd, name, sizeof(name) - 1, offs)) 1405 == -1) { 1406 if (file_printf(ms, 1407 ", can't read name of elf section at %jd", 1408 (intmax_t)offs) == -1) 1409 return -1; 1410 return 0; 1411 } 1412 name[namesize] = '\0'; 1413 if (strcmp(name, ".debug_info") == 0) { 1414 has_debug_info = 1; 1415 stripped = 0; 1416 } 1417 1418 if (pread(fd, xsh_addr, xsh_sizeof, off) < 1419 CAST(ssize_t, xsh_sizeof)) { 1420 if (file_printf(ms, ", can't read elf section at %jd", 1421 (intmax_t)off) == -1) 1422 return -1; 1423 return 0; 1424 } 1425 off += size; 1426 1427 /* Things we can determine before we seek */ 1428 switch (xsh_type) { 1429 case SHT_SYMTAB: 1430#if 0 1431 case SHT_DYNSYM: 1432#endif 1433 stripped = 0; 1434 break; 1435 default: 1436 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1437 /* Perhaps warn here */ 1438 continue; 1439 } 1440 break; 1441 } 1442 1443 1444 /* Things we can determine when we seek */ 1445 switch (xsh_type) { 1446 case SHT_NOTE: 1447 if (CAST(uintmax_t, (xsh_size + xsh_offset)) > 1448 CAST(uintmax_t, fsize)) { 1449 if (file_printf(ms, 1450 ", note offset/size %#" INTMAX_T_FORMAT 1451 "x+%#" INTMAX_T_FORMAT "x exceeds" 1452 " file size %#" INTMAX_T_FORMAT "x", 1453 CAST(uintmax_t, xsh_offset), 1454 CAST(uintmax_t, xsh_size), 1455 CAST(uintmax_t, fsize)) == -1) 1456 return -1; 1457 return 0; 1458 } 1459 if (xsh_size > ms->elf_shsize_max) { 1460 file_error(ms, errno, "Note section size too " 1461 "big (%ju > %zu)", (uintmax_t)xsh_size, 1462 ms->elf_shsize_max); 1463 return -1; 1464 } 1465 if ((nbuf = malloc(xsh_size)) == NULL) { 1466 file_error(ms, errno, "Cannot allocate memory" 1467 " for note"); 1468 return -1; 1469 } 1470 offs = xsh_offset; 1471 if (pread(fd, nbuf, xsh_size, offs) < 1472 CAST(ssize_t, xsh_size)) { 1473 free(nbuf); 1474 if (file_printf(ms, 1475 ", can't read elf note at %jd", 1476 (intmax_t)offs) == -1) 1477 return -1; 1478 return 0; 1479 } 1480 1481 noff = 0; 1482 for (;;) { 1483 if (noff >= CAST(off_t, xsh_size)) 1484 break; 1485 noff = donote(ms, nbuf, CAST(size_t, noff), 1486 xsh_size, clazz, swap, 4, flags, notecount, 1487 fd, 0, 0, 0); 1488 if (noff == 0) 1489 break; 1490 } 1491 free(nbuf); 1492 break; 1493 case SHT_SUNW_cap: 1494 switch (mach) { 1495 case EM_SPARC: 1496 case EM_SPARCV9: 1497 case EM_IA_64: 1498 case EM_386: 1499 case EM_AMD64: 1500 break; 1501 default: 1502 goto skip; 1503 } 1504 1505 if (nbadcap > 5) 1506 break; 1507 if (lseek(fd, xsh_offset, SEEK_SET) 1508 == CAST(off_t, -1)) { 1509 file_badseek(ms); 1510 return -1; 1511 } 1512 coff = 0; 1513 for (;;) { 1514 Elf32_Cap cap32; 1515 Elf64_Cap cap64; 1516 char cbuf[/*CONSTCOND*/ 1517 MAX(sizeof(cap32), sizeof(cap64))]; 1518 if ((coff += xcap_sizeof) > 1519 CAST(off_t, xsh_size)) 1520 break; 1521 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) != 1522 CAST(ssize_t, xcap_sizeof)) { 1523 file_badread(ms); 1524 return -1; 1525 } 1526 if (cbuf[0] == 'A') { 1527#ifdef notyet 1528 char *p = cbuf + 1; 1529 uint32_t len, tag; 1530 memcpy(&len, p, sizeof(len)); 1531 p += 4; 1532 len = getu32(swap, len); 1533 if (memcmp("gnu", p, 3) != 0) { 1534 if (file_printf(ms, 1535 ", unknown capability %.3s", p) 1536 == -1) 1537 return -1; 1538 break; 1539 } 1540 p += strlen(p) + 1; 1541 tag = *p++; 1542 memcpy(&len, p, sizeof(len)); 1543 p += 4; 1544 len = getu32(swap, len); 1545 if (tag != 1) { 1546 if (file_printf(ms, ", unknown gnu" 1547 " capability tag %d", tag) 1548 == -1) 1549 return -1; 1550 break; 1551 } 1552 // gnu attributes 1553#endif 1554 break; 1555 } 1556 memcpy(xcap_addr, cbuf, xcap_sizeof); 1557 switch (xcap_tag) { 1558 case CA_SUNW_NULL: 1559 break; 1560 case CA_SUNW_HW_1: 1561 cap_hw1 |= xcap_val; 1562 break; 1563 case CA_SUNW_SF_1: 1564 cap_sf1 |= xcap_val; 1565 break; 1566 default: 1567 if (file_printf(ms, 1568 ", with unknown capability " 1569 "%#" INT64_T_FORMAT "x = %#" 1570 INT64_T_FORMAT "x", 1571 CAST(unsigned long long, xcap_tag), 1572 CAST(unsigned long long, xcap_val)) 1573 == -1) 1574 return -1; 1575 if (nbadcap++ > 2) 1576 coff = xsh_size; 1577 break; 1578 } 1579 } 1580 /*FALLTHROUGH*/ 1581 skip: 1582 default: 1583 break; 1584 } 1585 } 1586 1587 if (has_debug_info) { 1588 if (file_printf(ms, ", with debug_info") == -1) 1589 return -1; 1590 } 1591 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1592 return -1; 1593 if (cap_hw1) { 1594 const cap_desc_t *cdp; 1595 switch (mach) { 1596 case EM_SPARC: 1597 case EM_SPARC32PLUS: 1598 case EM_SPARCV9: 1599 cdp = cap_desc_sparc; 1600 break; 1601 case EM_386: 1602 case EM_IA_64: 1603 case EM_AMD64: 1604 cdp = cap_desc_386; 1605 break; 1606 default: 1607 cdp = NULL; 1608 break; 1609 } 1610 if (file_printf(ms, ", uses") == -1) 1611 return -1; 1612 if (cdp) { 1613 while (cdp->cd_name) { 1614 if (cap_hw1 & cdp->cd_mask) { 1615 if (file_printf(ms, 1616 " %s", cdp->cd_name) == -1) 1617 return -1; 1618 cap_hw1 &= ~cdp->cd_mask; 1619 } 1620 ++cdp; 1621 } 1622 if (cap_hw1) 1623 if (file_printf(ms, 1624 " unknown hardware capability %#" 1625 INT64_T_FORMAT "x", 1626 CAST(unsigned long long, cap_hw1)) == -1) 1627 return -1; 1628 } else { 1629 if (file_printf(ms, 1630 " hardware capability %#" INT64_T_FORMAT "x", 1631 CAST(unsigned long long, cap_hw1)) == -1) 1632 return -1; 1633 } 1634 } 1635 if (cap_sf1) { 1636 if (cap_sf1 & SF1_SUNW_FPUSED) { 1637 if (file_printf(ms, 1638 (cap_sf1 & SF1_SUNW_FPKNWN) 1639 ? ", uses frame pointer" 1640 : ", not known to use frame pointer") == -1) 1641 return -1; 1642 } 1643 cap_sf1 &= ~SF1_SUNW_MASK; 1644 if (cap_sf1) 1645 if (file_printf(ms, 1646 ", with unknown software capability %#" 1647 INT64_T_FORMAT "x", 1648 CAST(unsigned long long, cap_sf1)) == -1) 1649 return -1; 1650 } 1651 return 0; 1652} 1653 1654/* 1655 * Look through the program headers of an executable image, to determine 1656 * if it is statically or dynamically linked. If it has a dynamic section, 1657 * it is pie, and does not have an interpreter or needed libraries, we 1658 * call it static pie. 1659 */ 1660file_private int 1661dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1662 int num, size_t size, off_t fsize, int sh_num, int *flags, 1663 uint16_t *notecount) 1664{ 1665 Elf32_Phdr ph32; 1666 Elf64_Phdr ph64; 1667 const char *linking_style; 1668 unsigned char nbuf[BUFSIZ]; 1669 char ibuf[BUFSIZ]; 1670 char interp[BUFSIZ]; 1671 ssize_t bufsize; 1672 size_t offset, align, need = 0; 1673 int pie = 0, dynamic = 0; 1674 1675 if (num == 0) { 1676 if (file_printf(ms, ", no program header") == -1) 1677 return -1; 1678 return 0; 1679 } 1680 if (size != xph_sizeof) { 1681 if (file_printf(ms, ", corrupted program header size") == -1) 1682 return -1; 1683 return 0; 1684 } 1685 1686 interp[0] = '\0'; 1687 for ( ; num; num--) { 1688 int doread; 1689 if (pread(fd, xph_addr, xph_sizeof, off) < 1690 CAST(ssize_t, xph_sizeof)) { 1691 if (file_printf(ms, 1692 ", can't read elf program headers at %jd", 1693 (intmax_t)off) == -1) 1694 return -1; 1695 return 0; 1696 } 1697 1698 off += size; 1699 bufsize = 0; 1700 align = 4; 1701 1702 /* Things we can determine before we seek */ 1703 switch (xph_type) { 1704 case PT_DYNAMIC: 1705 doread = 1; 1706 break; 1707 case PT_NOTE: 1708 if (sh_num) /* Did this through section headers */ 1709 continue; 1710 if (((align = xph_align) & 0x80000000UL) != 0 || 1711 align < 4) { 1712 if (file_printf(ms, 1713 ", invalid note alignment %#lx", 1714 CAST(unsigned long, align)) == -1) 1715 return -1; 1716 align = 4; 1717 } 1718 /*FALLTHROUGH*/ 1719 case PT_INTERP: 1720 doread = 1; 1721 break; 1722 default: 1723 doread = 0; 1724 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1725 /* Maybe warn here? */ 1726 continue; 1727 } 1728 break; 1729 } 1730 1731 if (doread) { 1732 size_t len = xph_filesz < sizeof(nbuf) ? xph_filesz 1733 : sizeof(nbuf); 1734 off_t offs = xph_offset; 1735 bufsize = pread(fd, nbuf, len, offs); 1736 if (bufsize == -1) { 1737 if (file_printf(ms, 1738 ", can't read section at %jd", 1739 (intmax_t)offs) == -1) 1740 return -1; 1741 return 0; 1742 } 1743 } 1744 1745 /* Things we can determine when we seek */ 1746 switch (xph_type) { 1747 case PT_DYNAMIC: 1748 dynamic = 1; 1749 offset = 0; 1750 // Let DF_1 determine if we are PIE or not. 1751 ms->mode &= ~0111; 1752 for (;;) { 1753 if (offset >= CAST(size_t, bufsize)) 1754 break; 1755 offset = dodynamic(ms, nbuf, offset, 1756 CAST(size_t, bufsize), clazz, swap, 1757 &pie, &need); 1758 if (offset == 0) 1759 break; 1760 } 1761 if (ms->flags & MAGIC_MIME) 1762 continue; 1763 break; 1764 1765 case PT_INTERP: 1766 need++; 1767 if (ms->flags & MAGIC_MIME) 1768 continue; 1769 if (bufsize && nbuf[0]) { 1770 nbuf[bufsize - 1] = '\0'; 1771 memcpy(interp, nbuf, CAST(size_t, bufsize)); 1772 } else 1773 strlcpy(interp, "*empty*", sizeof(interp)); 1774 break; 1775 case PT_NOTE: 1776 if (ms->flags & MAGIC_MIME) 1777 return 0; 1778 /* 1779 * This is a PT_NOTE section; loop through all the notes 1780 * in the section. 1781 */ 1782 offset = 0; 1783 for (;;) { 1784 if (offset >= CAST(size_t, bufsize)) 1785 break; 1786 offset = donote(ms, nbuf, offset, 1787 CAST(size_t, bufsize), clazz, swap, align, 1788 flags, notecount, fd, 0, 0, 0); 1789 if (offset == 0) 1790 break; 1791 } 1792 break; 1793 default: 1794 if (ms->flags & MAGIC_MIME) 1795 continue; 1796 break; 1797 } 1798 } 1799 if (ms->flags & MAGIC_MIME) 1800 return 0; 1801 if (dynamic) { 1802 if (pie && need == 0) 1803 linking_style = "static-pie"; 1804 else 1805 linking_style = "dynamically"; 1806 } else { 1807 linking_style = "statically"; 1808 } 1809 if (file_printf(ms, ", %s linked", linking_style) == -1) 1810 return -1; 1811 if (interp[0]) 1812 if (file_printf(ms, ", interpreter %s", file_printable(ms, 1813 ibuf, sizeof(ibuf), interp, sizeof(interp))) == -1) 1814 return -1; 1815 return 0; 1816} 1817 1818 1819file_protected int 1820file_tryelf(struct magic_set *ms, const struct buffer *b) 1821{ 1822 int fd = b->fd; 1823 const unsigned char *buf = CAST(const unsigned char *, b->fbuf); 1824 size_t nbytes = b->flen; 1825 union { 1826 int32_t l; 1827 char c[sizeof(int32_t)]; 1828 } u; 1829 int clazz; 1830 int swap; 1831 struct stat st; 1832 const struct stat *stp; 1833 off_t fsize; 1834 int flags = 0; 1835 Elf32_Ehdr elf32hdr; 1836 Elf64_Ehdr elf64hdr; 1837 uint16_t type, phnum, shnum, notecount; 1838 1839 if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION)) 1840 return 0; 1841 /* 1842 * ELF executables have multiple section headers in arbitrary 1843 * file locations and thus file(1) cannot determine it from easily. 1844 * Instead we traverse thru all section headers until a symbol table 1845 * one is found or else the binary is stripped. 1846 * Return immediately if it's not ELF (so we avoid pipe2file unless 1847 * needed). 1848 */ 1849 if (buf[EI_MAG0] != ELFMAG0 1850 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1851 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1852 return 0; 1853 1854 /* 1855 * If we cannot seek, it must be a pipe, socket or fifo. 1856 */ 1857 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) 1858 && (errno == ESPIPE)) 1859 fd = file_pipe2file(ms, fd, buf, nbytes); 1860 1861 if (fd == -1) { 1862 file_badread(ms); 1863 return -1; 1864 } 1865 1866 stp = &b->st; 1867 /* 1868 * b->st.st_size != 0 if previous fstat() succeeded, 1869 * which is likely, we can avoid extra stat() call. 1870 */ 1871 if (b->st.st_size == 0) { 1872 stp = &st; 1873 if (fstat(fd, &st) == -1) { 1874 file_badread(ms); 1875 return -1; 1876 } 1877 } 1878 if (S_ISREG(stp->st_mode) || stp->st_size != 0) 1879 fsize = stp->st_size; 1880 else 1881 fsize = SIZE_UNKNOWN; 1882 1883 clazz = buf[EI_CLASS]; 1884 1885 switch (clazz) { 1886 case ELFCLASS32: 1887#undef elf_getu 1888#define elf_getu(a, b) elf_getu32(a, b) 1889#undef elfhdr 1890#define elfhdr elf32hdr 1891#include "elfclass.h" 1892 case ELFCLASS64: 1893#undef elf_getu 1894#define elf_getu(a, b) elf_getu64(a, b) 1895#undef elfhdr 1896#define elfhdr elf64hdr 1897#include "elfclass.h" 1898 default: 1899 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1900 return -1; 1901 break; 1902 } 1903 return 0; 1904} 1905#endif 1906