1 /* $NetBSD: readelf.c,v 1.25 2021/04/09 19:11:42 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 1.175 2020/12/17 20:43:37 christos Exp $") 34 #else 35 __RCSID("$NetBSD: readelf.c,v 1.25 2021/04/09 19:11:42 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, offs; 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 if (file_printf(ms, 387 ", can't read elf program headers at %jd", 388 (intmax_t)off) == -1) 389 return -1; 390 return 0; 391 } 392 off += size; 393 394 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 395 /* Perhaps warn here */ 396 continue; 397 } 398 399 if (xph_type != PT_NOTE) 400 continue; 401 402 /* 403 * This is a PT_NOTE section; loop through all the notes 404 * in the section. 405 */ 406 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 407 offs = xph_offset; 408 if ((bufsize = pread(fd, nbuf, len, offs)) == -1) { 409 if (file_printf(ms, " can't read note section at %jd", 410 (intmax_t)offs) == -1) 411 return -1; 412 return 0; 413 } 414 offset = 0; 415 for (;;) { 416 if (offset >= CAST(size_t, bufsize)) 417 break; 418 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize), 419 clazz, swap, 4, flags, notecount, fd, ph_off, 420 ph_num, fsize); 421 if (offset == 0) 422 break; 423 424 } 425 } 426 return 0; 427 } 428 #endif 429 430 static int 431 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 432 { 433 uint32_t desc; 434 memcpy(&desc, v, sizeof(desc)); 435 desc = elf_getu32(swap, desc); 436 437 if (file_printf(ms, ", for NetBSD") == -1) 438 return -1; 439 /* 440 * The version number used to be stuck as 199905, and was thus 441 * basically content-free. Newer versions of NetBSD have fixed 442 * this and now use the encoding of __NetBSD_Version__: 443 * 444 * MMmmrrpp00 445 * 446 * M = major version 447 * m = minor version 448 * r = release ["",A-Z,Z[A-Z] but numeric] 449 * p = patchlevel 450 */ 451 if (desc > 100000000U) { 452 uint32_t ver_patch = (desc / 100) % 100; 453 uint32_t ver_rel = (desc / 10000) % 100; 454 uint32_t ver_min = (desc / 1000000) % 100; 455 uint32_t ver_maj = desc / 100000000; 456 457 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 458 return -1; 459 if (ver_rel == 0 && ver_patch != 0) { 460 if (file_printf(ms, ".%u", ver_patch) == -1) 461 return -1; 462 } else if (ver_rel != 0) { 463 while (ver_rel > 26) { 464 if (file_printf(ms, "Z") == -1) 465 return -1; 466 ver_rel -= 26; 467 } 468 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 469 == -1) 470 return -1; 471 } 472 } 473 return 0; 474 } 475 476 static int 477 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 478 { 479 uint32_t desc; 480 481 memcpy(&desc, v, sizeof(desc)); 482 desc = elf_getu32(swap, desc); 483 if (file_printf(ms, ", for FreeBSD") == -1) 484 return -1; 485 486 /* 487 * Contents is __FreeBSD_version, whose relation to OS 488 * versions is defined by a huge table in the Porter's 489 * Handbook. This is the general scheme: 490 * 491 * Releases: 492 * Mmp000 (before 4.10) 493 * Mmi0p0 (before 5.0) 494 * Mmm0p0 495 * 496 * Development branches: 497 * Mmpxxx (before 4.6) 498 * Mmp1xx (before 4.10) 499 * Mmi1xx (before 5.0) 500 * M000xx (pre-M.0) 501 * Mmm1xx 502 * 503 * M = major version 504 * m = minor version 505 * i = minor version increment (491000 -> 4.10) 506 * p = patchlevel 507 * x = revision 508 * 509 * The first release of FreeBSD to use ELF by default 510 * was version 3.0. 511 */ 512 if (desc == 460002) { 513 if (file_printf(ms, " 4.6.2") == -1) 514 return -1; 515 } else if (desc < 460100) { 516 if (file_printf(ms, " %d.%d", desc / 100000, 517 desc / 10000 % 10) == -1) 518 return -1; 519 if (desc / 1000 % 10 > 0) 520 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 521 return -1; 522 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 523 if (file_printf(ms, " (%d)", desc) == -1) 524 return -1; 525 } else if (desc < 500000) { 526 if (file_printf(ms, " %d.%d", desc / 100000, 527 desc / 10000 % 10 + desc / 1000 % 10) == -1) 528 return -1; 529 if (desc / 100 % 10 > 0) { 530 if (file_printf(ms, " (%d)", desc) == -1) 531 return -1; 532 } else if (desc / 10 % 10 > 0) { 533 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 534 return -1; 535 } 536 } else { 537 if (file_printf(ms, " %d.%d", desc / 100000, 538 desc / 1000 % 100) == -1) 539 return -1; 540 if ((desc / 100 % 10 > 0) || 541 (desc % 100000 / 100 == 0)) { 542 if (file_printf(ms, " (%d)", desc) == -1) 543 return -1; 544 } else if (desc / 10 % 10 > 0) { 545 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 546 return -1; 547 } 548 } 549 return 0; 550 } 551 552 private int 553 /*ARGSUSED*/ 554 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 555 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 556 size_t noff, size_t doff, int *flags) 557 { 558 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 && 559 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) { 560 uint8_t desc[20]; 561 const char *btype; 562 uint32_t i; 563 *flags |= FLAGS_DID_BUILD_ID; 564 switch (descsz) { 565 case 8: 566 btype = "xxHash"; 567 break; 568 case 16: 569 btype = "md5/uuid"; 570 break; 571 case 20: 572 btype = "sha1"; 573 break; 574 default: 575 btype = "unknown"; 576 break; 577 } 578 if (file_printf(ms, ", BuildID[%s]=", btype) == -1) 579 return -1; 580 memcpy(desc, &nbuf[doff], descsz); 581 for (i = 0; i < descsz; i++) 582 if (file_printf(ms, "%02x", desc[i]) == -1) 583 return -1; 584 return 1; 585 } 586 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 && 587 type == NT_GO_BUILD_ID && descsz < 128) { 588 char buf[256]; 589 if (file_printf(ms, ", Go BuildID=%s", 590 file_copystr(buf, sizeof(buf), descsz, 591 RCAST(const char *, &nbuf[doff]))) == -1) 592 return -1; 593 return 1; 594 } 595 return 0; 596 } 597 598 private int 599 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 600 int swap, uint32_t namesz, uint32_t descsz, 601 size_t noff, size_t doff, int *flags) 602 { 603 const char *name = RCAST(const char *, &nbuf[noff]); 604 605 if (namesz == 5 && strcmp(name, "SuSE") == 0 && 606 type == NT_GNU_VERSION && descsz == 2) { 607 *flags |= FLAGS_DID_OS_NOTE; 608 if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff], 609 nbuf[doff + 1]) == -1) 610 return -1; 611 return 1; 612 } 613 614 if (namesz == 4 && strcmp(name, "GNU") == 0 && 615 type == NT_GNU_VERSION && descsz == 16) { 616 uint32_t desc[4]; 617 memcpy(desc, &nbuf[doff], sizeof(desc)); 618 619 *flags |= FLAGS_DID_OS_NOTE; 620 if (file_printf(ms, ", for GNU/") == -1) 621 return -1; 622 switch (elf_getu32(swap, desc[0])) { 623 case GNU_OS_LINUX: 624 if (file_printf(ms, "Linux") == -1) 625 return -1; 626 break; 627 case GNU_OS_HURD: 628 if (file_printf(ms, "Hurd") == -1) 629 return -1; 630 break; 631 case GNU_OS_SOLARIS: 632 if (file_printf(ms, "Solaris") == -1) 633 return -1; 634 break; 635 case GNU_OS_KFREEBSD: 636 if (file_printf(ms, "kFreeBSD") == -1) 637 return -1; 638 break; 639 case GNU_OS_KNETBSD: 640 if (file_printf(ms, "kNetBSD") == -1) 641 return -1; 642 break; 643 default: 644 if (file_printf(ms, "<unknown>") == -1) 645 return -1; 646 } 647 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 648 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 649 return -1; 650 return 1; 651 } 652 653 if (namesz == 7 && strcmp(name, "NetBSD") == 0) { 654 if (type == NT_NETBSD_VERSION && descsz == 4) { 655 *flags |= FLAGS_DID_OS_NOTE; 656 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1) 657 return -1; 658 return 1; 659 } 660 } 661 662 if (namesz == 8 && strcmp(name, "FreeBSD") == 0) { 663 if (type == NT_FREEBSD_VERSION && descsz == 4) { 664 *flags |= FLAGS_DID_OS_NOTE; 665 if (do_note_freebsd_version(ms, swap, &nbuf[doff]) 666 == -1) 667 return -1; 668 return 1; 669 } 670 } 671 672 if (namesz == 8 && strcmp(name, "OpenBSD") == 0 && 673 type == NT_OPENBSD_VERSION && descsz == 4) { 674 *flags |= FLAGS_DID_OS_NOTE; 675 if (file_printf(ms, ", for OpenBSD") == -1) 676 return -1; 677 /* Content of note is always 0 */ 678 return 1; 679 } 680 681 if (namesz == 10 && strcmp(name, "DragonFly") == 0 && 682 type == NT_DRAGONFLY_VERSION && descsz == 4) { 683 uint32_t desc; 684 *flags |= FLAGS_DID_OS_NOTE; 685 if (file_printf(ms, ", for DragonFly") == -1) 686 return -1; 687 memcpy(&desc, &nbuf[doff], sizeof(desc)); 688 desc = elf_getu32(swap, desc); 689 if (file_printf(ms, " %d.%d.%d", desc / 100000, 690 desc / 10000 % 10, desc % 10000) == -1) 691 return -1; 692 return 1; 693 } 694 return 0; 695 } 696 697 private int 698 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 699 int swap, uint32_t namesz, uint32_t descsz, 700 size_t noff, size_t doff, int *flags) 701 { 702 const char *name = RCAST(const char *, &nbuf[noff]); 703 704 if (namesz == 4 && strcmp(name, "PaX") == 0 && 705 type == NT_NETBSD_PAX && descsz == 4) { 706 static const char *pax[] = { 707 "+mprotect", 708 "-mprotect", 709 "+segvguard", 710 "-segvguard", 711 "+ASLR", 712 "-ASLR", 713 }; 714 uint32_t desc; 715 size_t i; 716 int did = 0; 717 718 *flags |= FLAGS_DID_NETBSD_PAX; 719 memcpy(&desc, &nbuf[doff], sizeof(desc)); 720 desc = elf_getu32(swap, desc); 721 722 if (desc && file_printf(ms, ", PaX: ") == -1) 723 return -1; 724 725 for (i = 0; i < __arraycount(pax); i++) { 726 if (((1 << CAST(int, i)) & desc) == 0) 727 continue; 728 if (file_printf(ms, "%s%s", did++ ? "," : "", 729 pax[i]) == -1) 730 return -1; 731 } 732 return 1; 733 } 734 return 0; 735 } 736 737 private int 738 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 739 int swap, uint32_t namesz, uint32_t descsz, 740 size_t noff, size_t doff, int *flags, size_t size, int clazz) 741 { 742 #ifdef ELFCORE 743 char buf[256]; 744 const char *name = RCAST(const char *, &nbuf[noff]); 745 746 int os_style = -1; 747 /* 748 * Sigh. The 2.0.36 kernel in Debian 2.1, at 749 * least, doesn't correctly implement name 750 * sections, in core dumps, as specified by 751 * the "Program Linking" section of "UNIX(R) System 752 * V Release 4 Programmer's Guide: ANSI C and 753 * Programming Support Tools", because my copy 754 * clearly says "The first 'namesz' bytes in 'name' 755 * contain a *null-terminated* [emphasis mine] 756 * character representation of the entry's owner 757 * or originator", but the 2.0.36 kernel code 758 * doesn't include the terminating null in the 759 * name.... 760 */ 761 if ((namesz == 4 && strncmp(name, "CORE", 4) == 0) || 762 (namesz == 5 && strcmp(name, "CORE") == 0)) { 763 os_style = OS_STYLE_SVR4; 764 } 765 766 if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) { 767 os_style = OS_STYLE_FREEBSD; 768 } 769 770 if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11) 771 == 0)) { 772 os_style = OS_STYLE_NETBSD; 773 } 774 775 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 776 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 777 == -1) 778 return -1; 779 *flags |= FLAGS_DID_CORE_STYLE; 780 *flags |= os_style; 781 } 782 783 switch (os_style) { 784 case OS_STYLE_NETBSD: 785 if (type == NT_NETBSD_CORE_PROCINFO) { 786 char sbuf[512]; 787 struct NetBSD_elfcore_procinfo pi; 788 memset(&pi, 0, sizeof(pi)); 789 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi))); 790 791 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, " 792 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)", 793 file_printable(sbuf, sizeof(sbuf), 794 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)), 795 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)), 796 elf_getu32(swap, pi.cpi_euid), 797 elf_getu32(swap, pi.cpi_egid), 798 elf_getu32(swap, pi.cpi_nlwps), 799 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)), 800 elf_getu32(swap, pi.cpi_signo), 801 elf_getu32(swap, pi.cpi_sigcode)) == -1) 802 return -1; 803 804 *flags |= FLAGS_DID_CORE; 805 return 1; 806 } 807 break; 808 809 case OS_STYLE_FREEBSD: 810 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 811 size_t argoff, pidoff; 812 813 if (clazz == ELFCLASS32) 814 argoff = 4 + 4 + 17; 815 else 816 argoff = 4 + 4 + 8 + 17; 817 if (file_printf(ms, ", from '%.80s'", nbuf + doff + 818 argoff) == -1) 819 return -1; 820 pidoff = argoff + 81 + 2; 821 if (doff + pidoff + 4 <= size) { 822 if (file_printf(ms, ", pid=%u", 823 elf_getu32(swap, *RCAST(uint32_t *, (nbuf + 824 doff + pidoff)))) == -1) 825 return -1; 826 } 827 *flags |= FLAGS_DID_CORE; 828 } 829 break; 830 831 default: 832 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 833 size_t i, j; 834 unsigned char c; 835 /* 836 * Extract the program name. We assume 837 * it to be 16 characters (that's what it 838 * is in SunOS 5.x and Linux). 839 * 840 * Unfortunately, it's at a different offset 841 * in various OSes, so try multiple offsets. 842 * If the characters aren't all printable, 843 * reject it. 844 */ 845 for (i = 0; i < NOFFSETS; i++) { 846 unsigned char *cname, *cp; 847 size_t reloffset = prpsoffsets(i); 848 size_t noffset = doff + reloffset; 849 size_t k; 850 for (j = 0; j < 16; j++, noffset++, 851 reloffset++) { 852 /* 853 * Make sure we're not past 854 * the end of the buffer; if 855 * we are, just give up. 856 */ 857 if (noffset >= size) 858 goto tryanother; 859 860 /* 861 * Make sure we're not past 862 * the end of the contents; 863 * if we are, this obviously 864 * isn't the right offset. 865 */ 866 if (reloffset >= descsz) 867 goto tryanother; 868 869 c = nbuf[noffset]; 870 if (c == '\0') { 871 /* 872 * A '\0' at the 873 * beginning is 874 * obviously wrong. 875 * Any other '\0' 876 * means we're done. 877 */ 878 if (j == 0) 879 goto tryanother; 880 else 881 break; 882 } else { 883 /* 884 * A nonprintable 885 * character is also 886 * wrong. 887 */ 888 if (!isprint(c) || isquote(c)) 889 goto tryanother; 890 } 891 } 892 /* 893 * Well, that worked. 894 */ 895 896 /* 897 * Try next offsets, in case this match is 898 * in the middle of a string. 899 */ 900 for (k = i + 1 ; k < NOFFSETS; k++) { 901 size_t no; 902 int adjust = 1; 903 if (prpsoffsets(k) >= prpsoffsets(i)) 904 continue; 905 for (no = doff + prpsoffsets(k); 906 no < doff + prpsoffsets(i); no++) 907 adjust = adjust 908 && isprint(nbuf[no]); 909 if (adjust) 910 i = k; 911 } 912 913 cname = CAST(unsigned char *, 914 &nbuf[doff + prpsoffsets(i)]); 915 for (cp = cname; cp < nbuf + size && *cp 916 && isprint(*cp); cp++) 917 continue; 918 /* 919 * Linux apparently appends a space at the end 920 * of the command line: remove it. 921 */ 922 while (cp > cname && isspace(cp[-1])) 923 cp--; 924 if (file_printf(ms, ", from '%s'", 925 file_copystr(buf, sizeof(buf), 926 CAST(size_t, cp - cname), 927 CAST(const char *, cname))) == -1) 928 return -1; 929 *flags |= FLAGS_DID_CORE; 930 return 1; 931 932 tryanother: 933 ; 934 } 935 } 936 break; 937 } 938 #endif 939 return 0; 940 } 941 942 private off_t 943 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, 944 off_t off, int num, off_t fsize, uint64_t virtaddr) 945 { 946 Elf32_Phdr ph32; 947 Elf64_Phdr ph64; 948 949 /* 950 * Loop through all the program headers and find the header with 951 * virtual address in which the "virtaddr" belongs to. 952 */ 953 for ( ; num; num--) { 954 if (pread(fd, xph_addr, xph_sizeof, off) < 955 CAST(ssize_t, xph_sizeof)) { 956 if (file_printf(ms, 957 ", can't read elf program header at %jd", 958 (intmax_t)off) == -1) 959 return -1; 960 return 0; 961 962 } 963 off += xph_sizeof; 964 965 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 966 /* Perhaps warn here */ 967 continue; 968 } 969 970 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) 971 return xph_offset + (virtaddr - xph_vaddr); 972 } 973 return 0; 974 } 975 976 private size_t 977 get_string_on_virtaddr(struct magic_set *ms, 978 int swap, int clazz, int fd, off_t ph_off, int ph_num, 979 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) 980 { 981 char *bptr; 982 off_t offset; 983 984 if (buflen == 0) 985 return 0; 986 987 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, 988 fsize, virtaddr); 989 if (offset < 0 || 990 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) { 991 if (file_printf(ms, ", can't read elf string at %jd", 992 (intmax_t)offset) == -1) 993 return 0; 994 return 0; 995 } 996 997 buf[buflen - 1] = '\0'; 998 999 /* We expect only printable characters, so return if buffer contains 1000 * non-printable character before the '\0' or just '\0'. */ 1001 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++) 1002 continue; 1003 if (*bptr != '\0') 1004 return 0; 1005 1006 return bptr - buf; 1007 } 1008 1009 1010 /*ARGSUSED*/ 1011 private int 1012 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 1013 int swap, uint32_t namesz __attribute__((__unused__)), 1014 uint32_t descsz __attribute__((__unused__)), 1015 size_t noff __attribute__((__unused__)), size_t doff, 1016 int *flags, size_t size __attribute__((__unused__)), int clazz, 1017 int fd, off_t ph_off, int ph_num, off_t fsize) 1018 { 1019 #ifdef ELFCORE 1020 Aux32Info auxv32; 1021 Aux64Info auxv64; 1022 size_t elsize = xauxv_sizeof; 1023 const char *tag; 1024 int is_string; 1025 size_t nval; 1026 1027 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != 1028 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) 1029 return 0; 1030 1031 switch (*flags & FLAGS_CORE_STYLE) { 1032 case OS_STYLE_SVR4: 1033 if (type != NT_AUXV) 1034 return 0; 1035 break; 1036 #ifdef notyet 1037 case OS_STYLE_NETBSD: 1038 if (type != NT_NETBSD_CORE_AUXV) 1039 return 0; 1040 break; 1041 case OS_STYLE_FREEBSD: 1042 if (type != NT_FREEBSD_PROCSTAT_AUXV) 1043 return 0; 1044 break; 1045 #endif 1046 default: 1047 return 0; 1048 } 1049 1050 *flags |= FLAGS_DID_AUXV; 1051 1052 nval = 0; 1053 for (size_t off = 0; off + elsize <= descsz; off += elsize) { 1054 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 1055 /* Limit processing to 50 vector entries to prevent DoS */ 1056 if (nval++ >= 50) { 1057 file_error(ms, 0, "Too many ELF Auxv elements"); 1058 return 1; 1059 } 1060 1061 switch(xauxv_type) { 1062 case AT_LINUX_EXECFN: 1063 is_string = 1; 1064 tag = "execfn"; 1065 break; 1066 case AT_LINUX_PLATFORM: 1067 is_string = 1; 1068 tag = "platform"; 1069 break; 1070 case AT_LINUX_UID: 1071 is_string = 0; 1072 tag = "real uid"; 1073 break; 1074 case AT_LINUX_GID: 1075 is_string = 0; 1076 tag = "real gid"; 1077 break; 1078 case AT_LINUX_EUID: 1079 is_string = 0; 1080 tag = "effective uid"; 1081 break; 1082 case AT_LINUX_EGID: 1083 is_string = 0; 1084 tag = "effective gid"; 1085 break; 1086 default: 1087 is_string = 0; 1088 tag = NULL; 1089 break; 1090 } 1091 1092 if (tag == NULL) 1093 continue; 1094 1095 if (is_string) { 1096 char buf[256]; 1097 ssize_t buflen; 1098 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 1099 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 1100 1101 if (buflen == 0) 1102 continue; 1103 1104 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 1105 return -1; 1106 } else { 1107 if (file_printf(ms, ", %s: %d", tag, 1108 CAST(int, xauxv_val)) == -1) 1109 return -1; 1110 } 1111 } 1112 return 1; 1113 #else 1114 return 0; 1115 #endif 1116 } 1117 1118 private size_t 1119 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1120 int clazz, int swap, int *pie, size_t *need) 1121 { 1122 Elf32_Dyn dh32; 1123 Elf64_Dyn dh64; 1124 unsigned char *dbuf = CAST(unsigned char *, vbuf); 1125 1126 if (xdh_sizeof + offset > size) { 1127 /* 1128 * We're out of note headers. 1129 */ 1130 return xdh_sizeof + offset; 1131 } 1132 1133 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof); 1134 offset += xdh_sizeof; 1135 1136 switch (xdh_tag) { 1137 case DT_FLAGS_1: 1138 *pie = 1; 1139 if (xdh_val & DF_1_PIE) 1140 ms->mode |= 0111; 1141 else 1142 ms->mode &= ~0111; 1143 break; 1144 case DT_NEEDED: 1145 (*need)++; 1146 break; 1147 default: 1148 break; 1149 } 1150 return offset; 1151 } 1152 1153 1154 private size_t 1155 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1156 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1157 int fd, off_t ph_off, int ph_num, off_t fsize) 1158 { 1159 Elf32_Nhdr nh32; 1160 Elf64_Nhdr nh64; 1161 size_t noff, doff; 1162 uint32_t namesz, descsz; 1163 char buf[256]; 1164 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1165 1166 if (*notecount == 0) 1167 return 0; 1168 --*notecount; 1169 1170 if (xnh_sizeof + offset > size) { 1171 /* 1172 * We're out of note headers. 1173 */ 1174 return xnh_sizeof + offset; 1175 } 1176 /*XXX: GCC */ 1177 memset(&nh32, 0, sizeof(nh32)); 1178 memset(&nh64, 0, sizeof(nh64)); 1179 1180 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1181 offset += xnh_sizeof; 1182 1183 namesz = xnh_namesz; 1184 descsz = xnh_descsz; 1185 1186 if ((namesz == 0) && (descsz == 0)) { 1187 /* 1188 * We're out of note headers. 1189 */ 1190 return (offset >= size) ? offset : size; 1191 } 1192 1193 if (namesz & 0x80000000) { 1194 if (file_printf(ms, ", bad note name size %#lx", 1195 CAST(unsigned long, namesz)) == -1) 1196 return 0; 1197 return 0; 1198 } 1199 1200 if (descsz & 0x80000000) { 1201 if (file_printf(ms, ", bad note description size %#lx", 1202 CAST(unsigned long, descsz)) == -1) 1203 return 0; 1204 return 0; 1205 } 1206 1207 noff = offset; 1208 doff = ELF_ALIGN(offset + namesz); 1209 1210 if (offset + namesz > size) { 1211 /* 1212 * We're past the end of the buffer. 1213 */ 1214 return doff; 1215 } 1216 1217 offset = ELF_ALIGN(doff + descsz); 1218 if (doff + descsz > size) { 1219 /* 1220 * We're past the end of the buffer. 1221 */ 1222 return (offset >= size) ? offset : size; 1223 } 1224 1225 1226 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1227 if (do_os_note(ms, nbuf, xnh_type, swap, 1228 namesz, descsz, noff, doff, flags)) 1229 return offset; 1230 } 1231 1232 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1233 if (do_bid_note(ms, nbuf, xnh_type, swap, 1234 namesz, descsz, noff, doff, flags)) 1235 return offset; 1236 } 1237 1238 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1239 if (do_pax_note(ms, nbuf, xnh_type, swap, 1240 namesz, descsz, noff, doff, flags)) 1241 return offset; 1242 } 1243 1244 if ((*flags & FLAGS_DID_CORE) == 0) { 1245 if (do_core_note(ms, nbuf, xnh_type, swap, 1246 namesz, descsz, noff, doff, flags, size, clazz)) 1247 return offset; 1248 } 1249 1250 if ((*flags & FLAGS_DID_AUXV) == 0) { 1251 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1252 namesz, descsz, noff, doff, flags, size, clazz, 1253 fd, ph_off, ph_num, fsize)) 1254 return offset; 1255 } 1256 1257 if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) { 1258 int descw, flag; 1259 const char *str, *tag; 1260 if (descsz > 100) 1261 descsz = 100; 1262 switch (xnh_type) { 1263 case NT_NETBSD_VERSION: 1264 return offset; 1265 case NT_NETBSD_MARCH: 1266 flag = FLAGS_DID_NETBSD_MARCH; 1267 tag = "compiled for"; 1268 break; 1269 case NT_NETBSD_CMODEL: 1270 flag = FLAGS_DID_NETBSD_CMODEL; 1271 tag = "compiler model"; 1272 break; 1273 case NT_NETBSD_EMULATION: 1274 flag = FLAGS_DID_NETBSD_EMULATION; 1275 tag = "emulation:"; 1276 break; 1277 default: 1278 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1279 return offset; 1280 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1281 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1282 return offset; 1283 return offset; 1284 } 1285 1286 if (*flags & flag) 1287 return offset; 1288 str = RCAST(const char *, &nbuf[doff]); 1289 descw = CAST(int, descsz); 1290 *flags |= flag; 1291 file_printf(ms, ", %s: %s", tag, 1292 file_copystr(buf, sizeof(buf), descw, str)); 1293 return offset; 1294 } 1295 1296 return offset; 1297 } 1298 1299 /* SunOS 5.x hardware capability descriptions */ 1300 typedef struct cap_desc { 1301 uint64_t cd_mask; 1302 const char *cd_name; 1303 } cap_desc_t; 1304 1305 static const cap_desc_t cap_desc_sparc[] = { 1306 { AV_SPARC_MUL32, "MUL32" }, 1307 { AV_SPARC_DIV32, "DIV32" }, 1308 { AV_SPARC_FSMULD, "FSMULD" }, 1309 { AV_SPARC_V8PLUS, "V8PLUS" }, 1310 { AV_SPARC_POPC, "POPC" }, 1311 { AV_SPARC_VIS, "VIS" }, 1312 { AV_SPARC_VIS2, "VIS2" }, 1313 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1314 { AV_SPARC_FMAF, "FMAF" }, 1315 { AV_SPARC_FJFMAU, "FJFMAU" }, 1316 { AV_SPARC_IMA, "IMA" }, 1317 { 0, NULL } 1318 }; 1319 1320 static const cap_desc_t cap_desc_386[] = { 1321 { AV_386_FPU, "FPU" }, 1322 { AV_386_TSC, "TSC" }, 1323 { AV_386_CX8, "CX8" }, 1324 { AV_386_SEP, "SEP" }, 1325 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1326 { AV_386_CMOV, "CMOV" }, 1327 { AV_386_MMX, "MMX" }, 1328 { AV_386_AMD_MMX, "AMD_MMX" }, 1329 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1330 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1331 { AV_386_FXSR, "FXSR" }, 1332 { AV_386_SSE, "SSE" }, 1333 { AV_386_SSE2, "SSE2" }, 1334 { AV_386_PAUSE, "PAUSE" }, 1335 { AV_386_SSE3, "SSE3" }, 1336 { AV_386_MON, "MON" }, 1337 { AV_386_CX16, "CX16" }, 1338 { AV_386_AHF, "AHF" }, 1339 { AV_386_TSCP, "TSCP" }, 1340 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1341 { AV_386_POPCNT, "POPCNT" }, 1342 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1343 { AV_386_SSSE3, "SSSE3" }, 1344 { AV_386_SSE4_1, "SSE4.1" }, 1345 { AV_386_SSE4_2, "SSE4.2" }, 1346 { 0, NULL } 1347 }; 1348 1349 private int 1350 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1351 size_t size, off_t fsize, int mach, int strtab, int *flags, 1352 uint16_t *notecount) 1353 { 1354 Elf32_Shdr sh32; 1355 Elf64_Shdr sh64; 1356 int stripped = 1, has_debug_info = 0; 1357 size_t nbadcap = 0; 1358 void *nbuf; 1359 off_t noff, coff, name_off, offs; 1360 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ 1361 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ 1362 char name[50]; 1363 ssize_t namesize; 1364 1365 if (ms->flags & MAGIC_MIME) 1366 return 0; 1367 1368 if (num == 0) { 1369 if (file_printf(ms, ", no section header") == -1) 1370 return -1; 1371 return 0; 1372 } 1373 if (size != xsh_sizeof) { 1374 if (file_printf(ms, ", corrupted section header size") == -1) 1375 return -1; 1376 return 0; 1377 } 1378 1379 /* Read offset of name section to be able to read section names later */ 1380 offs = CAST(off_t, (off + size * strtab)); 1381 if (pread(fd, xsh_addr, xsh_sizeof, offs) < CAST(ssize_t, xsh_sizeof)) { 1382 if (file_printf(ms, ", missing section headers at %jd", 1383 (intmax_t)offs) == -1) 1384 return -1; 1385 return 0; 1386 } 1387 name_off = xsh_offset; 1388 1389 if (fsize != SIZE_UNKNOWN && fsize < name_off) { 1390 if (file_printf(ms, ", too large section header offset %jd", 1391 (intmax_t)name_off) == -1) 1392 return -1; 1393 return 0; 1394 } 1395 1396 for ( ; num; num--) { 1397 /* Read the name of this section. */ 1398 offs = name_off + xsh_name; 1399 if ((namesize = pread(fd, name, sizeof(name) - 1, offs)) 1400 == -1) { 1401 if (file_printf(ms, 1402 ", can't read name of elf section at %jd", 1403 (intmax_t)offs) == -1) 1404 return -1; 1405 return 0; 1406 } 1407 name[namesize] = '\0'; 1408 if (strcmp(name, ".debug_info") == 0) { 1409 has_debug_info = 1; 1410 stripped = 0; 1411 } 1412 1413 if (pread(fd, xsh_addr, xsh_sizeof, off) < 1414 CAST(ssize_t, xsh_sizeof)) { 1415 if (file_printf(ms, ", can't read elf section at %jd", 1416 (intmax_t)off) == -1) 1417 return -1; 1418 return 0; 1419 } 1420 off += size; 1421 1422 /* Things we can determine before we seek */ 1423 switch (xsh_type) { 1424 case SHT_SYMTAB: 1425 #if 0 1426 case SHT_DYNSYM: 1427 #endif 1428 stripped = 0; 1429 break; 1430 default: 1431 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1432 /* Perhaps warn here */ 1433 continue; 1434 } 1435 break; 1436 } 1437 1438 1439 /* Things we can determine when we seek */ 1440 switch (xsh_type) { 1441 case SHT_NOTE: 1442 if (CAST(uintmax_t, (xsh_size + xsh_offset)) > 1443 CAST(uintmax_t, fsize)) { 1444 if (file_printf(ms, 1445 ", note offset/size %#" INTMAX_T_FORMAT 1446 "x+%#" INTMAX_T_FORMAT "x exceeds" 1447 " file size %#" INTMAX_T_FORMAT "x", 1448 CAST(uintmax_t, xsh_offset), 1449 CAST(uintmax_t, xsh_size), 1450 CAST(uintmax_t, fsize)) == -1) 1451 return -1; 1452 return 0; 1453 } 1454 if ((nbuf = malloc(xsh_size)) == NULL) { 1455 file_error(ms, errno, "Cannot allocate memory" 1456 " for note"); 1457 return -1; 1458 } 1459 offs = xsh_offset; 1460 if (pread(fd, nbuf, xsh_size, offs) < 1461 CAST(ssize_t, xsh_size)) { 1462 free(nbuf); 1463 if (file_printf(ms, 1464 ", can't read elf note at %jd", 1465 (intmax_t)offs) == -1) 1466 return -1; 1467 return 0; 1468 } 1469 1470 noff = 0; 1471 for (;;) { 1472 if (noff >= CAST(off_t, xsh_size)) 1473 break; 1474 noff = donote(ms, nbuf, CAST(size_t, noff), 1475 xsh_size, clazz, swap, 4, flags, notecount, 1476 fd, 0, 0, 0); 1477 if (noff == 0) 1478 break; 1479 } 1480 free(nbuf); 1481 break; 1482 case SHT_SUNW_cap: 1483 switch (mach) { 1484 case EM_SPARC: 1485 case EM_SPARCV9: 1486 case EM_IA_64: 1487 case EM_386: 1488 case EM_AMD64: 1489 break; 1490 default: 1491 goto skip; 1492 } 1493 1494 if (nbadcap > 5) 1495 break; 1496 if (lseek(fd, xsh_offset, SEEK_SET) 1497 == CAST(off_t, -1)) { 1498 file_badseek(ms); 1499 return -1; 1500 } 1501 coff = 0; 1502 for (;;) { 1503 Elf32_Cap cap32; 1504 Elf64_Cap cap64; 1505 char cbuf[/*CONSTCOND*/ 1506 MAX(sizeof(cap32), sizeof(cap64))]; 1507 if ((coff += xcap_sizeof) > 1508 CAST(off_t, xsh_size)) 1509 break; 1510 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) != 1511 CAST(ssize_t, xcap_sizeof)) { 1512 file_badread(ms); 1513 return -1; 1514 } 1515 if (cbuf[0] == 'A') { 1516 #ifdef notyet 1517 char *p = cbuf + 1; 1518 uint32_t len, tag; 1519 memcpy(&len, p, sizeof(len)); 1520 p += 4; 1521 len = getu32(swap, len); 1522 if (memcmp("gnu", p, 3) != 0) { 1523 if (file_printf(ms, 1524 ", unknown capability %.3s", p) 1525 == -1) 1526 return -1; 1527 break; 1528 } 1529 p += strlen(p) + 1; 1530 tag = *p++; 1531 memcpy(&len, p, sizeof(len)); 1532 p += 4; 1533 len = getu32(swap, len); 1534 if (tag != 1) { 1535 if (file_printf(ms, ", unknown gnu" 1536 " capability tag %d", tag) 1537 == -1) 1538 return -1; 1539 break; 1540 } 1541 // gnu attributes 1542 #endif 1543 break; 1544 } 1545 memcpy(xcap_addr, cbuf, xcap_sizeof); 1546 switch (xcap_tag) { 1547 case CA_SUNW_NULL: 1548 break; 1549 case CA_SUNW_HW_1: 1550 cap_hw1 |= xcap_val; 1551 break; 1552 case CA_SUNW_SF_1: 1553 cap_sf1 |= xcap_val; 1554 break; 1555 default: 1556 if (file_printf(ms, 1557 ", with unknown capability " 1558 "%#" INT64_T_FORMAT "x = %#" 1559 INT64_T_FORMAT "x", 1560 CAST(unsigned long long, xcap_tag), 1561 CAST(unsigned long long, xcap_val)) 1562 == -1) 1563 return -1; 1564 if (nbadcap++ > 2) 1565 coff = xsh_size; 1566 break; 1567 } 1568 } 1569 /*FALLTHROUGH*/ 1570 skip: 1571 default: 1572 break; 1573 } 1574 } 1575 1576 if (has_debug_info) { 1577 if (file_printf(ms, ", with debug_info") == -1) 1578 return -1; 1579 } 1580 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1581 return -1; 1582 if (cap_hw1) { 1583 const cap_desc_t *cdp; 1584 switch (mach) { 1585 case EM_SPARC: 1586 case EM_SPARC32PLUS: 1587 case EM_SPARCV9: 1588 cdp = cap_desc_sparc; 1589 break; 1590 case EM_386: 1591 case EM_IA_64: 1592 case EM_AMD64: 1593 cdp = cap_desc_386; 1594 break; 1595 default: 1596 cdp = NULL; 1597 break; 1598 } 1599 if (file_printf(ms, ", uses") == -1) 1600 return -1; 1601 if (cdp) { 1602 while (cdp->cd_name) { 1603 if (cap_hw1 & cdp->cd_mask) { 1604 if (file_printf(ms, 1605 " %s", cdp->cd_name) == -1) 1606 return -1; 1607 cap_hw1 &= ~cdp->cd_mask; 1608 } 1609 ++cdp; 1610 } 1611 if (cap_hw1) 1612 if (file_printf(ms, 1613 " unknown hardware capability %#" 1614 INT64_T_FORMAT "x", 1615 CAST(unsigned long long, cap_hw1)) == -1) 1616 return -1; 1617 } else { 1618 if (file_printf(ms, 1619 " hardware capability %#" INT64_T_FORMAT "x", 1620 CAST(unsigned long long, cap_hw1)) == -1) 1621 return -1; 1622 } 1623 } 1624 if (cap_sf1) { 1625 if (cap_sf1 & SF1_SUNW_FPUSED) { 1626 if (file_printf(ms, 1627 (cap_sf1 & SF1_SUNW_FPKNWN) 1628 ? ", uses frame pointer" 1629 : ", not known to use frame pointer") == -1) 1630 return -1; 1631 } 1632 cap_sf1 &= ~SF1_SUNW_MASK; 1633 if (cap_sf1) 1634 if (file_printf(ms, 1635 ", with unknown software capability %#" 1636 INT64_T_FORMAT "x", 1637 CAST(unsigned long long, cap_sf1)) == -1) 1638 return -1; 1639 } 1640 return 0; 1641 } 1642 1643 /* 1644 * Look through the program headers of an executable image, to determine 1645 * if it is statically or dynamically linked. If it has a dynamic section, 1646 * it is pie, and does not have an interpreter or needed libraries, we 1647 * call it static pie. 1648 */ 1649 private int 1650 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1651 int num, size_t size, off_t fsize, int sh_num, int *flags, 1652 uint16_t *notecount) 1653 { 1654 Elf32_Phdr ph32; 1655 Elf64_Phdr ph64; 1656 const char *linking_style; 1657 unsigned char nbuf[BUFSIZ]; 1658 char ibuf[BUFSIZ]; 1659 char interp[BUFSIZ]; 1660 ssize_t bufsize; 1661 size_t offset, align, len, need = 0; 1662 int pie = 0, dynamic = 0; 1663 1664 if (num == 0) { 1665 if (file_printf(ms, ", no program header") == -1) 1666 return -1; 1667 return 0; 1668 } 1669 if (size != xph_sizeof) { 1670 if (file_printf(ms, ", corrupted program header size") == -1) 1671 return -1; 1672 return 0; 1673 } 1674 1675 interp[0] = '\0'; 1676 for ( ; num; num--) { 1677 int doread; 1678 if (pread(fd, xph_addr, xph_sizeof, off) < 1679 CAST(ssize_t, xph_sizeof)) { 1680 if (file_printf(ms, 1681 ", can't read elf program headers at %jd", 1682 (intmax_t)off) == -1) 1683 return -1; 1684 return 0; 1685 } 1686 1687 off += size; 1688 bufsize = 0; 1689 align = 4; 1690 1691 /* Things we can determine before we seek */ 1692 switch (xph_type) { 1693 case PT_DYNAMIC: 1694 doread = 1; 1695 break; 1696 case PT_NOTE: 1697 if (sh_num) /* Did this through section headers */ 1698 continue; 1699 if (((align = xph_align) & 0x80000000UL) != 0 || 1700 align < 4) { 1701 if (file_printf(ms, 1702 ", invalid note alignment %#lx", 1703 CAST(unsigned long, align)) == -1) 1704 return -1; 1705 align = 4; 1706 } 1707 /*FALLTHROUGH*/ 1708 case PT_INTERP: 1709 doread = 1; 1710 break; 1711 default: 1712 doread = 0; 1713 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1714 /* Maybe warn here? */ 1715 continue; 1716 } 1717 break; 1718 } 1719 1720 if (doread) { 1721 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1722 : sizeof(nbuf); 1723 off_t offs = xph_offset; 1724 bufsize = pread(fd, nbuf, len, offs); 1725 if (bufsize == -1) { 1726 if (file_printf(ms, 1727 ", can't read section at %jd", 1728 (intmax_t)offs) == -1) 1729 return -1; 1730 return 0; 1731 } 1732 } else 1733 len = 0; 1734 1735 /* Things we can determine when we seek */ 1736 switch (xph_type) { 1737 case PT_DYNAMIC: 1738 dynamic = 1; 1739 offset = 0; 1740 // Let DF_1 determine if we are PIE or not. 1741 ms->mode &= ~0111; 1742 for (;;) { 1743 if (offset >= CAST(size_t, bufsize)) 1744 break; 1745 offset = dodynamic(ms, nbuf, offset, 1746 CAST(size_t, bufsize), clazz, swap, 1747 &pie, &need); 1748 if (offset == 0) 1749 break; 1750 } 1751 if (ms->flags & MAGIC_MIME) 1752 continue; 1753 break; 1754 1755 case PT_INTERP: 1756 need++; 1757 if (ms->flags & MAGIC_MIME) 1758 continue; 1759 if (bufsize && nbuf[0]) { 1760 nbuf[bufsize - 1] = '\0'; 1761 memcpy(interp, nbuf, CAST(size_t, bufsize)); 1762 } else 1763 strlcpy(interp, "*empty*", sizeof(interp)); 1764 break; 1765 case PT_NOTE: 1766 if (ms->flags & MAGIC_MIME) 1767 return 0; 1768 /* 1769 * This is a PT_NOTE section; loop through all the notes 1770 * in the section. 1771 */ 1772 offset = 0; 1773 for (;;) { 1774 if (offset >= CAST(size_t, bufsize)) 1775 break; 1776 offset = donote(ms, nbuf, offset, 1777 CAST(size_t, bufsize), clazz, swap, align, 1778 flags, notecount, fd, 0, 0, 0); 1779 if (offset == 0) 1780 break; 1781 } 1782 break; 1783 default: 1784 if (ms->flags & MAGIC_MIME) 1785 continue; 1786 break; 1787 } 1788 } 1789 if (ms->flags & MAGIC_MIME) 1790 return 0; 1791 if (dynamic) { 1792 if (pie && need == 0) 1793 linking_style = "static-pie"; 1794 else 1795 linking_style = "dynamically"; 1796 } else { 1797 linking_style = "statically"; 1798 } 1799 if (file_printf(ms, ", %s linked", linking_style) == -1) 1800 return -1; 1801 if (interp[0]) 1802 if (file_printf(ms, ", interpreter %s", 1803 file_printable(ibuf, sizeof(ibuf), interp, sizeof(interp))) 1804 == -1) 1805 return -1; 1806 return 0; 1807 } 1808 1809 1810 protected int 1811 file_tryelf(struct magic_set *ms, const struct buffer *b) 1812 { 1813 int fd = b->fd; 1814 const unsigned char *buf = CAST(const unsigned char *, b->fbuf); 1815 size_t nbytes = b->flen; 1816 union { 1817 int32_t l; 1818 char c[sizeof(int32_t)]; 1819 } u; 1820 int clazz; 1821 int swap; 1822 struct stat st; 1823 const struct stat *stp; 1824 off_t fsize; 1825 int flags = 0; 1826 Elf32_Ehdr elf32hdr; 1827 Elf64_Ehdr elf64hdr; 1828 uint16_t type, phnum, shnum, notecount; 1829 1830 if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION)) 1831 return 0; 1832 /* 1833 * ELF executables have multiple section headers in arbitrary 1834 * file locations and thus file(1) cannot determine it from easily. 1835 * Instead we traverse thru all section headers until a symbol table 1836 * one is found or else the binary is stripped. 1837 * Return immediately if it's not ELF (so we avoid pipe2file unless 1838 * needed). 1839 */ 1840 if (buf[EI_MAG0] != ELFMAG0 1841 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1842 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1843 return 0; 1844 1845 /* 1846 * If we cannot seek, it must be a pipe, socket or fifo. 1847 */ 1848 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) 1849 && (errno == ESPIPE)) 1850 fd = file_pipe2file(ms, fd, buf, nbytes); 1851 1852 if (fd == -1) { 1853 file_badread(ms); 1854 return -1; 1855 } 1856 1857 stp = &b->st; 1858 /* 1859 * b->st.st_size != 0 if previous fstat() succeeded, 1860 * which is likely, we can avoid extra stat() call. 1861 */ 1862 if (b->st.st_size == 0) { 1863 stp = &st; 1864 if (fstat(fd, &st) == -1) { 1865 file_badread(ms); 1866 return -1; 1867 } 1868 } 1869 if (S_ISREG(stp->st_mode) || stp->st_size != 0) 1870 fsize = stp->st_size; 1871 else 1872 fsize = SIZE_UNKNOWN; 1873 1874 clazz = buf[EI_CLASS]; 1875 1876 switch (clazz) { 1877 case ELFCLASS32: 1878 #undef elf_getu 1879 #define elf_getu(a, b) elf_getu32(a, b) 1880 #undef elfhdr 1881 #define elfhdr elf32hdr 1882 #include "elfclass.h" 1883 case ELFCLASS64: 1884 #undef elf_getu 1885 #define elf_getu(a, b) elf_getu64(a, b) 1886 #undef elfhdr 1887 #define elfhdr elf64hdr 1888 #include "elfclass.h" 1889 default: 1890 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1891 return -1; 1892 break; 1893 } 1894 return 0; 1895 } 1896 #endif 1897