1 /* $NetBSD: readelf.c,v 1.26 2022/09/24 20:21:46 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 1.184 2022/09/22 13:42:34 christos Exp $") 34 #else 35 __RCSID("$NetBSD: readelf.c,v 1.26 2022/09/24 20:21:46 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 MAX_SHSIZE (64 * 1024 * 1024) 72 #define SIZE_UNKNOWN CAST(off_t, -1) 73 74 private int 75 toomany(struct magic_set *ms, const char *name, uint16_t num) 76 { 77 if (ms->flags & MAGIC_MIME) 78 return 1; 79 if (file_printf(ms, ", too many %s (%u)", name, num) == -1) 80 return -1; 81 return 1; 82 } 83 84 private uint16_t 85 getu16(int swap, uint16_t value) 86 { 87 union { 88 uint16_t ui; 89 char c[2]; 90 } retval, tmpval; 91 92 if (swap) { 93 tmpval.ui = value; 94 95 retval.c[0] = tmpval.c[1]; 96 retval.c[1] = tmpval.c[0]; 97 98 return retval.ui; 99 } else 100 return value; 101 } 102 103 private uint32_t 104 getu32(int swap, uint32_t value) 105 { 106 union { 107 uint32_t ui; 108 char c[4]; 109 } retval, tmpval; 110 111 if (swap) { 112 tmpval.ui = value; 113 114 retval.c[0] = tmpval.c[3]; 115 retval.c[1] = tmpval.c[2]; 116 retval.c[2] = tmpval.c[1]; 117 retval.c[3] = tmpval.c[0]; 118 119 return retval.ui; 120 } else 121 return value; 122 } 123 124 private uint64_t 125 getu64(int swap, uint64_t value) 126 { 127 union { 128 uint64_t ui; 129 char c[8]; 130 } retval, tmpval; 131 132 if (swap) { 133 tmpval.ui = value; 134 135 retval.c[0] = tmpval.c[7]; 136 retval.c[1] = tmpval.c[6]; 137 retval.c[2] = tmpval.c[5]; 138 retval.c[3] = tmpval.c[4]; 139 retval.c[4] = tmpval.c[3]; 140 retval.c[5] = tmpval.c[2]; 141 retval.c[6] = tmpval.c[1]; 142 retval.c[7] = tmpval.c[0]; 143 144 return retval.ui; 145 } else 146 return value; 147 } 148 149 #define elf_getu16(swap, value) getu16(swap, value) 150 #define elf_getu32(swap, value) getu32(swap, value) 151 #define elf_getu64(swap, value) getu64(swap, value) 152 153 #define xsh_addr (clazz == ELFCLASS32 \ 154 ? CAST(void *, &sh32) \ 155 : CAST(void *, &sh64)) 156 #define xsh_sizeof (clazz == ELFCLASS32 \ 157 ? sizeof(sh32) \ 158 : sizeof(sh64)) 159 #define xsh_size CAST(size_t, (clazz == ELFCLASS32 \ 160 ? elf_getu32(swap, sh32.sh_size) \ 161 : elf_getu64(swap, sh64.sh_size))) 162 #define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \ 163 ? elf_getu32(swap, sh32.sh_offset) \ 164 : elf_getu64(swap, sh64.sh_offset))) 165 #define xsh_type (clazz == ELFCLASS32 \ 166 ? elf_getu32(swap, sh32.sh_type) \ 167 : elf_getu32(swap, sh64.sh_type)) 168 #define xsh_name (clazz == ELFCLASS32 \ 169 ? elf_getu32(swap, sh32.sh_name) \ 170 : elf_getu32(swap, sh64.sh_name)) 171 172 #define xph_addr (clazz == ELFCLASS32 \ 173 ? CAST(void *, &ph32) \ 174 : CAST(void *, &ph64)) 175 #define xph_sizeof (clazz == ELFCLASS32 \ 176 ? sizeof(ph32) \ 177 : sizeof(ph64)) 178 #define xph_type (clazz == ELFCLASS32 \ 179 ? elf_getu32(swap, ph32.p_type) \ 180 : elf_getu32(swap, ph64.p_type)) 181 #define xph_offset CAST(off_t, (clazz == ELFCLASS32 \ 182 ? elf_getu32(swap, ph32.p_offset) \ 183 : elf_getu64(swap, ph64.p_offset))) 184 #define xph_align CAST(size_t, (clazz == ELFCLASS32 \ 185 ? CAST(off_t, (ph32.p_align ? \ 186 elf_getu32(swap, ph32.p_align) : 4))\ 187 : CAST(off_t, (ph64.p_align ? \ 188 elf_getu64(swap, ph64.p_align) : 4)))) 189 #define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \ 190 ? CAST(off_t, (ph32.p_vaddr ? \ 191 elf_getu32(swap, ph32.p_vaddr) : 4))\ 192 : CAST(off_t, (ph64.p_vaddr ? \ 193 elf_getu64(swap, ph64.p_vaddr) : 4)))) 194 #define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \ 195 ? elf_getu32(swap, ph32.p_filesz) \ 196 : elf_getu64(swap, ph64.p_filesz))) 197 #define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \ 198 ? elf_getu32(swap, ph32.p_memsz) \ 199 : elf_getu64(swap, ph64.p_memsz)))) 200 #define xnh_addr (clazz == ELFCLASS32 \ 201 ? CAST(void *, &nh32) \ 202 : CAST(void *, &nh64)) 203 #define xnh_sizeof (clazz == ELFCLASS32 \ 204 ? sizeof(nh32) \ 205 : sizeof(nh64)) 206 #define xnh_type (clazz == ELFCLASS32 \ 207 ? elf_getu32(swap, nh32.n_type) \ 208 : elf_getu32(swap, nh64.n_type)) 209 #define xnh_namesz (clazz == ELFCLASS32 \ 210 ? elf_getu32(swap, nh32.n_namesz) \ 211 : elf_getu32(swap, nh64.n_namesz)) 212 #define xnh_descsz (clazz == ELFCLASS32 \ 213 ? elf_getu32(swap, nh32.n_descsz) \ 214 : elf_getu32(swap, nh64.n_descsz)) 215 216 #define xdh_addr (clazz == ELFCLASS32 \ 217 ? CAST(void *, &dh32) \ 218 : CAST(void *, &dh64)) 219 #define xdh_sizeof (clazz == ELFCLASS32 \ 220 ? sizeof(dh32) \ 221 : sizeof(dh64)) 222 #define xdh_tag (clazz == ELFCLASS32 \ 223 ? elf_getu32(swap, dh32.d_tag) \ 224 : elf_getu64(swap, dh64.d_tag)) 225 #define xdh_val (clazz == ELFCLASS32 \ 226 ? elf_getu32(swap, dh32.d_un.d_val) \ 227 : elf_getu64(swap, dh64.d_un.d_val)) 228 229 #define xcap_addr (clazz == ELFCLASS32 \ 230 ? CAST(void *, &cap32) \ 231 : CAST(void *, &cap64)) 232 #define xcap_sizeof (clazz == ELFCLASS32 \ 233 ? sizeof(cap32) \ 234 : sizeof(cap64)) 235 #define xcap_tag (clazz == ELFCLASS32 \ 236 ? elf_getu32(swap, cap32.c_tag) \ 237 : elf_getu64(swap, cap64.c_tag)) 238 #define xcap_val (clazz == ELFCLASS32 \ 239 ? elf_getu32(swap, cap32.c_un.c_val) \ 240 : elf_getu64(swap, cap64.c_un.c_val)) 241 242 #define xauxv_addr (clazz == ELFCLASS32 \ 243 ? CAST(void *, &auxv32) \ 244 : CAST(void *, &auxv64)) 245 #define xauxv_sizeof (clazz == ELFCLASS32 \ 246 ? sizeof(auxv32) \ 247 : sizeof(auxv64)) 248 #define xauxv_type (clazz == ELFCLASS32 \ 249 ? elf_getu32(swap, auxv32.a_type) \ 250 : elf_getu64(swap, auxv64.a_type)) 251 #define xauxv_val (clazz == ELFCLASS32 \ 252 ? elf_getu32(swap, auxv32.a_v) \ 253 : elf_getu64(swap, auxv64.a_v)) 254 255 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 256 ? prpsoffsets32[i] \ 257 : prpsoffsets64[i]) 258 259 #ifdef ELFCORE 260 /* 261 * Try larger offsets first to avoid false matches 262 * from earlier data that happen to look like strings. 263 */ 264 static const size_t prpsoffsets32[] = { 265 #ifdef USE_NT_PSINFO 266 104, /* SunOS 5.x (command line) */ 267 88, /* SunOS 5.x (short name) */ 268 #endif /* USE_NT_PSINFO */ 269 270 100, /* SunOS 5.x (command line) */ 271 84, /* SunOS 5.x (short name) */ 272 273 44, /* Linux (command line) */ 274 28, /* Linux (short name) */ 275 276 48, /* Linux PowerPC (command line) */ 277 32, /* Linux PowerPC (short name) */ 278 279 8, /* FreeBSD */ 280 }; 281 282 static const size_t prpsoffsets64[] = { 283 #ifdef USE_NT_PSINFO 284 152, /* SunOS 5.x (command line) */ 285 136, /* SunOS 5.x (short name) */ 286 #endif /* USE_NT_PSINFO */ 287 288 136, /* SunOS 5.x, 64-bit (command line) */ 289 120, /* SunOS 5.x, 64-bit (short name) */ 290 291 56, /* Linux (command line) */ 292 40, /* Linux (tested on core from 2.4.x, short name) */ 293 294 16, /* FreeBSD, 64-bit */ 295 }; 296 297 #define NOFFSETS32 __arraycount(prpsoffsets32) 298 #define NOFFSETS64 __arraycount(prpsoffsets64) 299 300 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 301 302 /* 303 * Look through the program headers of an executable image, searching 304 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 305 * "FreeBSD"; if one is found, try looking in various places in its 306 * contents for a 16-character string containing only printable 307 * characters - if found, that string should be the name of the program 308 * that dropped core. Note: right after that 16-character string is, 309 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 310 * Linux, a longer string (80 characters, in 5.x, probably other 311 * SVR4-flavored systems, and Linux) containing the start of the 312 * command line for that program. 313 * 314 * SunOS 5.x core files contain two PT_NOTE sections, with the types 315 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 316 * same info about the command name and command line, so it probably 317 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 318 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 319 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 320 * the SunOS 5.x file command relies on this (and prefers the latter). 321 * 322 * The signal number probably appears in a section of type NT_PRSTATUS, 323 * but that's also rather OS-dependent, in ways that are harder to 324 * dissect with heuristics, so I'm not bothering with the signal number. 325 * (I suppose the signal number could be of interest in situations where 326 * you don't have the binary of the program that dropped core; if you 327 * *do* have that binary, the debugger will probably tell you what 328 * signal it was.) 329 */ 330 331 #define OS_STYLE_SVR4 0 332 #define OS_STYLE_FREEBSD 1 333 #define OS_STYLE_NETBSD 2 334 335 private const char os_style_names[][8] = { 336 "SVR4", 337 "FreeBSD", 338 "NetBSD", 339 }; 340 341 #define FLAGS_CORE_STYLE 0x0003 342 343 #define FLAGS_DID_CORE 0x0004 344 #define FLAGS_DID_OS_NOTE 0x0008 345 #define FLAGS_DID_BUILD_ID 0x0010 346 #define FLAGS_DID_CORE_STYLE 0x0020 347 #define FLAGS_DID_NETBSD_PAX 0x0040 348 #define FLAGS_DID_NETBSD_MARCH 0x0080 349 #define FLAGS_DID_NETBSD_CMODEL 0x0100 350 #define FLAGS_DID_NETBSD_EMULATION 0x0200 351 #define FLAGS_DID_NETBSD_UNKNOWN 0x0400 352 #define FLAGS_IS_CORE 0x0800 353 #define FLAGS_DID_AUXV 0x1000 354 355 private int 356 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 357 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 358 { 359 Elf32_Phdr ph32; 360 Elf64_Phdr ph64; 361 size_t offset, len; 362 unsigned char nbuf[BUFSIZ]; 363 ssize_t bufsize; 364 off_t ph_off = off, offs; 365 int ph_num = num; 366 367 if (ms->flags & MAGIC_MIME) 368 return 0; 369 370 if (num == 0) { 371 if (file_printf(ms, ", no program header") == -1) 372 return -1; 373 return 0; 374 } 375 if (size != xph_sizeof) { 376 if (file_printf(ms, ", corrupted program header size") == -1) 377 return -1; 378 return 0; 379 } 380 381 /* 382 * Loop through all the program headers. 383 */ 384 for ( ; num; num--) { 385 if (pread(fd, xph_addr, xph_sizeof, off) < 386 CAST(ssize_t, xph_sizeof)) { 387 if (file_printf(ms, 388 ", can't read elf program headers at %jd", 389 (intmax_t)off) == -1) 390 return -1; 391 return 0; 392 } 393 off += size; 394 395 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 396 /* Perhaps warn here */ 397 continue; 398 } 399 400 if (xph_type != PT_NOTE) 401 continue; 402 403 /* 404 * This is a PT_NOTE section; loop through all the notes 405 * in the section. 406 */ 407 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 408 offs = xph_offset; 409 if ((bufsize = pread(fd, nbuf, len, offs)) == -1) { 410 if (file_printf(ms, " can't read note section at %jd", 411 (intmax_t)offs) == -1) 412 return -1; 413 return 0; 414 } 415 offset = 0; 416 for (;;) { 417 if (offset >= CAST(size_t, bufsize)) 418 break; 419 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize), 420 clazz, swap, 4, flags, notecount, fd, ph_off, 421 ph_num, fsize); 422 if (offset == 0) 423 break; 424 425 } 426 } 427 return 0; 428 } 429 #endif 430 431 static int 432 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 433 { 434 uint32_t desc; 435 memcpy(&desc, v, sizeof(desc)); 436 desc = elf_getu32(swap, desc); 437 438 if (file_printf(ms, ", for NetBSD") == -1) 439 return -1; 440 /* 441 * The version number used to be stuck as 199905, and was thus 442 * basically content-free. Newer versions of NetBSD have fixed 443 * this and now use the encoding of __NetBSD_Version__: 444 * 445 * MMmmrrpp00 446 * 447 * M = major version 448 * m = minor version 449 * r = release ["",A-Z,Z[A-Z] but numeric] 450 * p = patchlevel 451 */ 452 if (desc > 100000000U) { 453 uint32_t ver_patch = (desc / 100) % 100; 454 uint32_t ver_rel = (desc / 10000) % 100; 455 uint32_t ver_min = (desc / 1000000) % 100; 456 uint32_t ver_maj = desc / 100000000; 457 458 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 459 return -1; 460 if (ver_maj >= 9) { 461 ver_patch += 100 * ver_rel; 462 ver_rel = 0; 463 } 464 if (ver_rel == 0 && ver_patch != 0) { 465 if (file_printf(ms, ".%u", ver_patch) == -1) 466 return -1; 467 } else if (ver_rel != 0) { 468 while (ver_rel > 26) { 469 if (file_printf(ms, "Z") == -1) 470 return -1; 471 ver_rel -= 26; 472 } 473 if (file_printf(ms, "%c", 'A' + ver_rel - 1) == -1) 474 return -1; 475 } 476 } 477 return 0; 478 } 479 480 static int 481 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 482 { 483 uint32_t desc; 484 485 memcpy(&desc, v, sizeof(desc)); 486 desc = elf_getu32(swap, desc); 487 if (file_printf(ms, ", for FreeBSD") == -1) 488 return -1; 489 490 /* 491 * Contents is __FreeBSD_version, whose relation to OS 492 * versions is defined by a huge table in the Porter's 493 * Handbook. This is the general scheme: 494 * 495 * Releases: 496 * Mmp000 (before 4.10) 497 * Mmi0p0 (before 5.0) 498 * Mmm0p0 499 * 500 * Development branches: 501 * Mmpxxx (before 4.6) 502 * Mmp1xx (before 4.10) 503 * Mmi1xx (before 5.0) 504 * M000xx (pre-M.0) 505 * Mmm1xx 506 * 507 * M = major version 508 * m = minor version 509 * i = minor version increment (491000 -> 4.10) 510 * p = patchlevel 511 * x = revision 512 * 513 * The first release of FreeBSD to use ELF by default 514 * was version 3.0. 515 */ 516 if (desc == 460002) { 517 if (file_printf(ms, " 4.6.2") == -1) 518 return -1; 519 } else if (desc < 460100) { 520 if (file_printf(ms, " %d.%d", desc / 100000, 521 desc / 10000 % 10) == -1) 522 return -1; 523 if (desc / 1000 % 10 > 0) 524 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 525 return -1; 526 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 527 if (file_printf(ms, " (%d)", desc) == -1) 528 return -1; 529 } else if (desc < 500000) { 530 if (file_printf(ms, " %d.%d", desc / 100000, 531 desc / 10000 % 10 + desc / 1000 % 10) == -1) 532 return -1; 533 if (desc / 100 % 10 > 0) { 534 if (file_printf(ms, " (%d)", desc) == -1) 535 return -1; 536 } else if (desc / 10 % 10 > 0) { 537 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 538 return -1; 539 } 540 } else { 541 if (file_printf(ms, " %d.%d", desc / 100000, 542 desc / 1000 % 100) == -1) 543 return -1; 544 if ((desc / 100 % 10 > 0) || 545 (desc % 100000 / 100 == 0)) { 546 if (file_printf(ms, " (%d)", desc) == -1) 547 return -1; 548 } else if (desc / 10 % 10 > 0) { 549 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 550 return -1; 551 } 552 } 553 return 0; 554 } 555 556 private int 557 /*ARGSUSED*/ 558 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 559 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 560 size_t noff, size_t doff, int *flags) 561 { 562 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 && 563 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) { 564 uint8_t desc[20]; 565 const char *btype; 566 uint32_t i; 567 *flags |= FLAGS_DID_BUILD_ID; 568 switch (descsz) { 569 case 8: 570 btype = "xxHash"; 571 break; 572 case 16: 573 btype = "md5/uuid"; 574 break; 575 case 20: 576 btype = "sha1"; 577 break; 578 default: 579 btype = "unknown"; 580 break; 581 } 582 if (file_printf(ms, ", BuildID[%s]=", btype) == -1) 583 return -1; 584 memcpy(desc, &nbuf[doff], descsz); 585 for (i = 0; i < descsz; i++) 586 if (file_printf(ms, "%02x", desc[i]) == -1) 587 return -1; 588 return 1; 589 } 590 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 && 591 type == NT_GO_BUILD_ID && descsz < 128) { 592 char buf[256]; 593 if (file_printf(ms, ", Go BuildID=%s", 594 file_copystr(buf, sizeof(buf), descsz, 595 RCAST(const char *, &nbuf[doff]))) == -1) 596 return -1; 597 return 1; 598 } 599 return 0; 600 } 601 602 private int 603 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 604 int swap, uint32_t namesz, uint32_t descsz, 605 size_t noff, size_t doff, int *flags) 606 { 607 const char *name = RCAST(const char *, &nbuf[noff]); 608 609 if (namesz == 5 && strcmp(name, "SuSE") == 0 && 610 type == NT_GNU_VERSION && descsz == 2) { 611 *flags |= FLAGS_DID_OS_NOTE; 612 if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff], 613 nbuf[doff + 1]) == -1) 614 return -1; 615 return 1; 616 } 617 618 if (namesz == 4 && strcmp(name, "GNU") == 0 && 619 type == NT_GNU_VERSION && descsz == 16) { 620 uint32_t desc[4]; 621 memcpy(desc, &nbuf[doff], sizeof(desc)); 622 623 *flags |= FLAGS_DID_OS_NOTE; 624 if (file_printf(ms, ", for GNU/") == -1) 625 return -1; 626 switch (elf_getu32(swap, desc[0])) { 627 case GNU_OS_LINUX: 628 if (file_printf(ms, "Linux") == -1) 629 return -1; 630 break; 631 case GNU_OS_HURD: 632 if (file_printf(ms, "Hurd") == -1) 633 return -1; 634 break; 635 case GNU_OS_SOLARIS: 636 if (file_printf(ms, "Solaris") == -1) 637 return -1; 638 break; 639 case GNU_OS_KFREEBSD: 640 if (file_printf(ms, "kFreeBSD") == -1) 641 return -1; 642 break; 643 case GNU_OS_KNETBSD: 644 if (file_printf(ms, "kNetBSD") == -1) 645 return -1; 646 break; 647 default: 648 if (file_printf(ms, "<unknown>") == -1) 649 return -1; 650 } 651 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 652 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 653 return -1; 654 return 1; 655 } 656 657 if (namesz == 7 && strcmp(name, "NetBSD") == 0) { 658 if (type == NT_NETBSD_VERSION && descsz == 4) { 659 *flags |= FLAGS_DID_OS_NOTE; 660 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1) 661 return -1; 662 return 1; 663 } 664 } 665 666 if (namesz == 8 && strcmp(name, "FreeBSD") == 0) { 667 if (type == NT_FREEBSD_VERSION && descsz == 4) { 668 *flags |= FLAGS_DID_OS_NOTE; 669 if (do_note_freebsd_version(ms, swap, &nbuf[doff]) 670 == -1) 671 return -1; 672 return 1; 673 } 674 } 675 676 if (namesz == 8 && strcmp(name, "OpenBSD") == 0 && 677 type == NT_OPENBSD_VERSION && descsz == 4) { 678 *flags |= FLAGS_DID_OS_NOTE; 679 if (file_printf(ms, ", for OpenBSD") == -1) 680 return -1; 681 /* Content of note is always 0 */ 682 return 1; 683 } 684 685 if (namesz == 10 && strcmp(name, "DragonFly") == 0 && 686 type == NT_DRAGONFLY_VERSION && descsz == 4) { 687 uint32_t desc; 688 *flags |= FLAGS_DID_OS_NOTE; 689 if (file_printf(ms, ", for DragonFly") == -1) 690 return -1; 691 memcpy(&desc, &nbuf[doff], sizeof(desc)); 692 desc = elf_getu32(swap, desc); 693 if (file_printf(ms, " %d.%d.%d", desc / 100000, 694 desc / 10000 % 10, desc % 10000) == -1) 695 return -1; 696 return 1; 697 } 698 return 0; 699 } 700 701 private int 702 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 703 int swap, uint32_t namesz, uint32_t descsz, 704 size_t noff, size_t doff, int *flags) 705 { 706 const char *name = RCAST(const char *, &nbuf[noff]); 707 708 if (namesz == 4 && strcmp(name, "PaX") == 0 && 709 type == NT_NETBSD_PAX && descsz == 4) { 710 static const char *pax[] = { 711 "+mprotect", 712 "-mprotect", 713 "+segvguard", 714 "-segvguard", 715 "+ASLR", 716 "-ASLR", 717 }; 718 uint32_t desc; 719 size_t i; 720 int did = 0; 721 722 *flags |= FLAGS_DID_NETBSD_PAX; 723 memcpy(&desc, &nbuf[doff], sizeof(desc)); 724 desc = elf_getu32(swap, desc); 725 726 if (desc && file_printf(ms, ", PaX: ") == -1) 727 return -1; 728 729 for (i = 0; i < __arraycount(pax); i++) { 730 if (((1 << CAST(int, i)) & desc) == 0) 731 continue; 732 if (file_printf(ms, "%s%s", did++ ? "," : "", 733 pax[i]) == -1) 734 return -1; 735 } 736 return 1; 737 } 738 return 0; 739 } 740 741 private int 742 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 743 int swap, uint32_t namesz, uint32_t descsz, 744 size_t noff, size_t doff, int *flags, size_t size, int clazz) 745 { 746 #ifdef ELFCORE 747 char buf[256]; 748 const char *name = RCAST(const char *, &nbuf[noff]); 749 750 int os_style = -1; 751 /* 752 * Sigh. The 2.0.36 kernel in Debian 2.1, at 753 * least, doesn't correctly implement name 754 * sections, in core dumps, as specified by 755 * the "Program Linking" section of "UNIX(R) System 756 * V Release 4 Programmer's Guide: ANSI C and 757 * Programming Support Tools", because my copy 758 * clearly says "The first 'namesz' bytes in 'name' 759 * contain a *null-terminated* [emphasis mine] 760 * character representation of the entry's owner 761 * or originator", but the 2.0.36 kernel code 762 * doesn't include the terminating null in the 763 * name.... 764 */ 765 if ((namesz == 4 && strncmp(name, "CORE", 4) == 0) || 766 (namesz == 5 && strcmp(name, "CORE") == 0)) { 767 os_style = OS_STYLE_SVR4; 768 } 769 770 if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) { 771 os_style = OS_STYLE_FREEBSD; 772 } 773 774 if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11) 775 == 0)) { 776 os_style = OS_STYLE_NETBSD; 777 } 778 779 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 780 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 781 == -1) 782 return -1; 783 *flags |= FLAGS_DID_CORE_STYLE; 784 *flags |= os_style; 785 } 786 787 switch (os_style) { 788 case OS_STYLE_NETBSD: 789 if (type == NT_NETBSD_CORE_PROCINFO) { 790 char sbuf[512]; 791 struct NetBSD_elfcore_procinfo pi; 792 memset(&pi, 0, sizeof(pi)); 793 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi))); 794 795 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, " 796 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)", 797 file_printable(ms, sbuf, sizeof(sbuf), 798 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)), 799 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)), 800 elf_getu32(swap, pi.cpi_euid), 801 elf_getu32(swap, pi.cpi_egid), 802 elf_getu32(swap, pi.cpi_nlwps), 803 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)), 804 elf_getu32(swap, pi.cpi_signo), 805 elf_getu32(swap, pi.cpi_sigcode)) == -1) 806 return -1; 807 808 *flags |= FLAGS_DID_CORE; 809 return 1; 810 } 811 break; 812 813 case OS_STYLE_FREEBSD: 814 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 815 size_t argoff, pidoff; 816 817 if (clazz == ELFCLASS32) 818 argoff = 4 + 4 + 17; 819 else 820 argoff = 4 + 4 + 8 + 17; 821 if (file_printf(ms, ", from '%.80s'", nbuf + doff + 822 argoff) == -1) 823 return -1; 824 pidoff = argoff + 81 + 2; 825 if (doff + pidoff + 4 <= size) { 826 if (file_printf(ms, ", pid=%u", 827 elf_getu32(swap, *RCAST(uint32_t *, (nbuf + 828 doff + pidoff)))) == -1) 829 return -1; 830 } 831 *flags |= FLAGS_DID_CORE; 832 } 833 break; 834 835 default: 836 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 837 size_t i, j; 838 unsigned char c; 839 /* 840 * Extract the program name. We assume 841 * it to be 16 characters (that's what it 842 * is in SunOS 5.x and Linux). 843 * 844 * Unfortunately, it's at a different offset 845 * in various OSes, so try multiple offsets. 846 * If the characters aren't all printable, 847 * reject it. 848 */ 849 for (i = 0; i < NOFFSETS; i++) { 850 unsigned char *cname, *cp; 851 size_t reloffset = prpsoffsets(i); 852 size_t noffset = doff + reloffset; 853 size_t k; 854 for (j = 0; j < 16; j++, noffset++, 855 reloffset++) { 856 /* 857 * Make sure we're not past 858 * the end of the buffer; if 859 * we are, just give up. 860 */ 861 if (noffset >= size) 862 goto tryanother; 863 864 /* 865 * Make sure we're not past 866 * the end of the contents; 867 * if we are, this obviously 868 * isn't the right offset. 869 */ 870 if (reloffset >= descsz) 871 goto tryanother; 872 873 c = nbuf[noffset]; 874 if (c == '\0') { 875 /* 876 * A '\0' at the 877 * beginning is 878 * obviously wrong. 879 * Any other '\0' 880 * means we're done. 881 */ 882 if (j == 0) 883 goto tryanother; 884 else 885 break; 886 } else { 887 /* 888 * A nonprintable 889 * character is also 890 * wrong. 891 */ 892 if (!isprint(c) || isquote(c)) 893 goto tryanother; 894 } 895 } 896 /* 897 * Well, that worked. 898 */ 899 900 /* 901 * Try next offsets, in case this match is 902 * in the middle of a string. 903 */ 904 for (k = i + 1 ; k < NOFFSETS; k++) { 905 size_t no; 906 int adjust = 1; 907 if (prpsoffsets(k) >= prpsoffsets(i)) 908 continue; 909 /* 910 * pr_fname == pr_psargs - 16 && 911 * non-nul-terminated fname (qemu) 912 */ 913 if (prpsoffsets(k) == 914 prpsoffsets(i) - 16 && j == 16) 915 continue; 916 for (no = doff + prpsoffsets(k); 917 no < doff + prpsoffsets(i); no++) 918 adjust = adjust 919 && isprint(nbuf[no]); 920 if (adjust) 921 i = k; 922 } 923 924 cname = CAST(unsigned char *, 925 &nbuf[doff + prpsoffsets(i)]); 926 for (cp = cname; cp < nbuf + size && *cp 927 && isprint(*cp); cp++) 928 continue; 929 /* 930 * Linux apparently appends a space at the end 931 * of the command line: remove it. 932 */ 933 while (cp > cname && isspace(cp[-1])) 934 cp--; 935 if (file_printf(ms, ", from '%s'", 936 file_copystr(buf, sizeof(buf), 937 CAST(size_t, cp - cname), 938 RCAST(char *, cname))) == -1) 939 return -1; 940 *flags |= FLAGS_DID_CORE; 941 return 1; 942 943 tryanother: 944 ; 945 } 946 } 947 break; 948 } 949 #endif 950 return 0; 951 } 952 953 private off_t 954 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, 955 off_t off, int num, off_t fsize, uint64_t virtaddr) 956 { 957 Elf32_Phdr ph32; 958 Elf64_Phdr ph64; 959 960 /* 961 * Loop through all the program headers and find the header with 962 * virtual address in which the "virtaddr" belongs to. 963 */ 964 for ( ; num; num--) { 965 if (pread(fd, xph_addr, xph_sizeof, off) < 966 CAST(ssize_t, xph_sizeof)) { 967 if (file_printf(ms, 968 ", can't read elf program header at %jd", 969 (intmax_t)off) == -1) 970 return -1; 971 return 0; 972 973 } 974 off += xph_sizeof; 975 976 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 977 /* Perhaps warn here */ 978 continue; 979 } 980 981 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) 982 return xph_offset + (virtaddr - xph_vaddr); 983 } 984 return 0; 985 } 986 987 private size_t 988 get_string_on_virtaddr(struct magic_set *ms, 989 int swap, int clazz, int fd, off_t ph_off, int ph_num, 990 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) 991 { 992 char *bptr; 993 off_t offset; 994 995 if (buflen == 0) 996 return 0; 997 998 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, 999 fsize, virtaddr); 1000 if (offset < 0 || 1001 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) { 1002 (void)file_printf(ms, ", can't read elf string at %jd", 1003 (intmax_t)offset); 1004 return 0; 1005 } 1006 1007 buf[buflen - 1] = '\0'; 1008 1009 /* We expect only printable characters, so return if buffer contains 1010 * non-printable character before the '\0' or just '\0'. */ 1011 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++) 1012 continue; 1013 if (*bptr != '\0') 1014 return 0; 1015 1016 return bptr - buf; 1017 } 1018 1019 1020 /*ARGSUSED*/ 1021 private int 1022 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 1023 int swap, uint32_t namesz __attribute__((__unused__)), 1024 uint32_t descsz __attribute__((__unused__)), 1025 size_t noff __attribute__((__unused__)), size_t doff, 1026 int *flags, size_t size __attribute__((__unused__)), int clazz, 1027 int fd, off_t ph_off, int ph_num, off_t fsize) 1028 { 1029 #ifdef ELFCORE 1030 Aux32Info auxv32; 1031 Aux64Info auxv64; 1032 size_t elsize = xauxv_sizeof; 1033 const char *tag; 1034 int is_string; 1035 size_t nval, off; 1036 1037 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != 1038 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) 1039 return 0; 1040 1041 switch (*flags & FLAGS_CORE_STYLE) { 1042 case OS_STYLE_SVR4: 1043 if (type != NT_AUXV) 1044 return 0; 1045 break; 1046 #ifdef notyet 1047 case OS_STYLE_NETBSD: 1048 if (type != NT_NETBSD_CORE_AUXV) 1049 return 0; 1050 break; 1051 case OS_STYLE_FREEBSD: 1052 if (type != NT_FREEBSD_PROCSTAT_AUXV) 1053 return 0; 1054 break; 1055 #endif 1056 default: 1057 return 0; 1058 } 1059 1060 *flags |= FLAGS_DID_AUXV; 1061 1062 nval = 0; 1063 for (off = 0; off + elsize <= descsz; off += elsize) { 1064 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 1065 /* Limit processing to 50 vector entries to prevent DoS */ 1066 if (nval++ >= 50) { 1067 file_error(ms, 0, "Too many ELF Auxv elements"); 1068 return 1; 1069 } 1070 1071 switch(xauxv_type) { 1072 case AT_LINUX_EXECFN: 1073 is_string = 1; 1074 tag = "execfn"; 1075 break; 1076 case AT_LINUX_PLATFORM: 1077 is_string = 1; 1078 tag = "platform"; 1079 break; 1080 case AT_LINUX_UID: 1081 is_string = 0; 1082 tag = "real uid"; 1083 break; 1084 case AT_LINUX_GID: 1085 is_string = 0; 1086 tag = "real gid"; 1087 break; 1088 case AT_LINUX_EUID: 1089 is_string = 0; 1090 tag = "effective uid"; 1091 break; 1092 case AT_LINUX_EGID: 1093 is_string = 0; 1094 tag = "effective gid"; 1095 break; 1096 default: 1097 is_string = 0; 1098 tag = NULL; 1099 break; 1100 } 1101 1102 if (tag == NULL) 1103 continue; 1104 1105 if (is_string) { 1106 char buf[256]; 1107 ssize_t buflen; 1108 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 1109 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 1110 1111 if (buflen == 0) 1112 continue; 1113 1114 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 1115 return -1; 1116 } else { 1117 if (file_printf(ms, ", %s: %d", tag, 1118 CAST(int, xauxv_val)) == -1) 1119 return -1; 1120 } 1121 } 1122 return 1; 1123 #else 1124 return 0; 1125 #endif 1126 } 1127 1128 private size_t 1129 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1130 int clazz, int swap, int *pie, size_t *need) 1131 { 1132 Elf32_Dyn dh32; 1133 Elf64_Dyn dh64; 1134 unsigned char *dbuf = CAST(unsigned char *, vbuf); 1135 1136 if (xdh_sizeof + offset > size) { 1137 /* 1138 * We're out of note headers. 1139 */ 1140 return xdh_sizeof + offset; 1141 } 1142 1143 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof); 1144 offset += xdh_sizeof; 1145 1146 switch (xdh_tag) { 1147 case DT_FLAGS_1: 1148 *pie = 1; 1149 if (xdh_val & DF_1_PIE) 1150 ms->mode |= 0111; 1151 else 1152 ms->mode &= ~0111; 1153 break; 1154 case DT_NEEDED: 1155 (*need)++; 1156 break; 1157 default: 1158 break; 1159 } 1160 return offset; 1161 } 1162 1163 1164 private size_t 1165 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1166 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1167 int fd, off_t ph_off, int ph_num, off_t fsize) 1168 { 1169 Elf32_Nhdr nh32; 1170 Elf64_Nhdr nh64; 1171 size_t noff, doff; 1172 uint32_t namesz, descsz; 1173 char buf[256]; 1174 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1175 1176 if (*notecount == 0) 1177 return 0; 1178 --*notecount; 1179 1180 if (xnh_sizeof + offset > size) { 1181 /* 1182 * We're out of note headers. 1183 */ 1184 return xnh_sizeof + offset; 1185 } 1186 /*XXX: GCC */ 1187 memset(&nh32, 0, sizeof(nh32)); 1188 memset(&nh64, 0, sizeof(nh64)); 1189 1190 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1191 offset += xnh_sizeof; 1192 1193 namesz = xnh_namesz; 1194 descsz = xnh_descsz; 1195 1196 if ((namesz == 0) && (descsz == 0)) { 1197 /* 1198 * We're out of note headers. 1199 */ 1200 return (offset >= size) ? offset : size; 1201 } 1202 1203 if (namesz & 0x80000000) { 1204 (void)file_printf(ms, ", bad note name size %#lx", 1205 CAST(unsigned long, namesz)); 1206 return 0; 1207 } 1208 1209 if (descsz & 0x80000000) { 1210 (void)file_printf(ms, ", bad note description size %#lx", 1211 CAST(unsigned long, descsz)); 1212 return 0; 1213 } 1214 1215 noff = offset; 1216 doff = ELF_ALIGN(offset + namesz); 1217 1218 if (offset + namesz > size) { 1219 /* 1220 * We're past the end of the buffer. 1221 */ 1222 return doff; 1223 } 1224 1225 offset = ELF_ALIGN(doff + descsz); 1226 if (doff + descsz > size) { 1227 /* 1228 * We're past the end of the buffer. 1229 */ 1230 return (offset >= size) ? offset : size; 1231 } 1232 1233 1234 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1235 if (do_os_note(ms, nbuf, xnh_type, swap, 1236 namesz, descsz, noff, doff, flags)) 1237 return offset; 1238 } 1239 1240 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1241 if (do_bid_note(ms, nbuf, xnh_type, swap, 1242 namesz, descsz, noff, doff, flags)) 1243 return offset; 1244 } 1245 1246 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1247 if (do_pax_note(ms, nbuf, xnh_type, swap, 1248 namesz, descsz, noff, doff, flags)) 1249 return offset; 1250 } 1251 1252 if ((*flags & FLAGS_DID_CORE) == 0) { 1253 if (do_core_note(ms, nbuf, xnh_type, swap, 1254 namesz, descsz, noff, doff, flags, size, clazz)) 1255 return offset; 1256 } 1257 1258 if ((*flags & FLAGS_DID_AUXV) == 0) { 1259 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1260 namesz, descsz, noff, doff, flags, size, clazz, 1261 fd, ph_off, ph_num, fsize)) 1262 return offset; 1263 } 1264 1265 if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) { 1266 int descw, flag; 1267 const char *str, *tag; 1268 if (descsz > 100) 1269 descsz = 100; 1270 switch (xnh_type) { 1271 case NT_NETBSD_VERSION: 1272 return offset; 1273 case NT_NETBSD_MARCH: 1274 flag = FLAGS_DID_NETBSD_MARCH; 1275 tag = "compiled for"; 1276 break; 1277 case NT_NETBSD_CMODEL: 1278 flag = FLAGS_DID_NETBSD_CMODEL; 1279 tag = "compiler model"; 1280 break; 1281 case NT_NETBSD_EMULATION: 1282 flag = FLAGS_DID_NETBSD_EMULATION; 1283 tag = "emulation:"; 1284 break; 1285 default: 1286 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1287 return offset; 1288 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1289 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1290 return offset; 1291 return offset; 1292 } 1293 1294 if (*flags & flag) 1295 return offset; 1296 str = RCAST(const char *, &nbuf[doff]); 1297 descw = CAST(int, descsz); 1298 *flags |= flag; 1299 file_printf(ms, ", %s: %s", tag, 1300 file_copystr(buf, sizeof(buf), descw, str)); 1301 return offset; 1302 } 1303 1304 return offset; 1305 } 1306 1307 /* SunOS 5.x hardware capability descriptions */ 1308 typedef struct cap_desc { 1309 uint64_t cd_mask; 1310 const char *cd_name; 1311 } cap_desc_t; 1312 1313 static const cap_desc_t cap_desc_sparc[] = { 1314 { AV_SPARC_MUL32, "MUL32" }, 1315 { AV_SPARC_DIV32, "DIV32" }, 1316 { AV_SPARC_FSMULD, "FSMULD" }, 1317 { AV_SPARC_V8PLUS, "V8PLUS" }, 1318 { AV_SPARC_POPC, "POPC" }, 1319 { AV_SPARC_VIS, "VIS" }, 1320 { AV_SPARC_VIS2, "VIS2" }, 1321 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1322 { AV_SPARC_FMAF, "FMAF" }, 1323 { AV_SPARC_FJFMAU, "FJFMAU" }, 1324 { AV_SPARC_IMA, "IMA" }, 1325 { 0, NULL } 1326 }; 1327 1328 static const cap_desc_t cap_desc_386[] = { 1329 { AV_386_FPU, "FPU" }, 1330 { AV_386_TSC, "TSC" }, 1331 { AV_386_CX8, "CX8" }, 1332 { AV_386_SEP, "SEP" }, 1333 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1334 { AV_386_CMOV, "CMOV" }, 1335 { AV_386_MMX, "MMX" }, 1336 { AV_386_AMD_MMX, "AMD_MMX" }, 1337 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1338 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1339 { AV_386_FXSR, "FXSR" }, 1340 { AV_386_SSE, "SSE" }, 1341 { AV_386_SSE2, "SSE2" }, 1342 { AV_386_PAUSE, "PAUSE" }, 1343 { AV_386_SSE3, "SSE3" }, 1344 { AV_386_MON, "MON" }, 1345 { AV_386_CX16, "CX16" }, 1346 { AV_386_AHF, "AHF" }, 1347 { AV_386_TSCP, "TSCP" }, 1348 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1349 { AV_386_POPCNT, "POPCNT" }, 1350 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1351 { AV_386_SSSE3, "SSSE3" }, 1352 { AV_386_SSE4_1, "SSE4.1" }, 1353 { AV_386_SSE4_2, "SSE4.2" }, 1354 { 0, NULL } 1355 }; 1356 1357 private int 1358 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1359 size_t size, off_t fsize, int mach, int strtab, int *flags, 1360 uint16_t *notecount) 1361 { 1362 Elf32_Shdr sh32; 1363 Elf64_Shdr sh64; 1364 int stripped = 1, has_debug_info = 0; 1365 size_t nbadcap = 0; 1366 void *nbuf; 1367 off_t noff, coff, name_off, offs; 1368 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ 1369 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ 1370 char name[50]; 1371 ssize_t namesize; 1372 1373 if (ms->flags & MAGIC_MIME) 1374 return 0; 1375 1376 if (num == 0) { 1377 if (file_printf(ms, ", no section header") == -1) 1378 return -1; 1379 return 0; 1380 } 1381 if (size != xsh_sizeof) { 1382 if (file_printf(ms, ", corrupted section header size") == -1) 1383 return -1; 1384 return 0; 1385 } 1386 1387 /* Read offset of name section to be able to read section names later */ 1388 offs = CAST(off_t, (off + size * strtab)); 1389 if (pread(fd, xsh_addr, xsh_sizeof, offs) < CAST(ssize_t, xsh_sizeof)) { 1390 if (file_printf(ms, ", missing section headers at %jd", 1391 (intmax_t)offs) == -1) 1392 return -1; 1393 return 0; 1394 } 1395 name_off = xsh_offset; 1396 1397 if (fsize != SIZE_UNKNOWN && fsize < name_off) { 1398 if (file_printf(ms, ", too large section header offset %jd", 1399 (intmax_t)name_off) == -1) 1400 return -1; 1401 return 0; 1402 } 1403 1404 for ( ; num; num--) { 1405 /* Read the name of this section. */ 1406 offs = name_off + xsh_name; 1407 if ((namesize = pread(fd, name, sizeof(name) - 1, offs)) 1408 == -1) { 1409 if (file_printf(ms, 1410 ", can't read name of elf section at %jd", 1411 (intmax_t)offs) == -1) 1412 return -1; 1413 return 0; 1414 } 1415 name[namesize] = '\0'; 1416 if (strcmp(name, ".debug_info") == 0) { 1417 has_debug_info = 1; 1418 stripped = 0; 1419 } 1420 1421 if (pread(fd, xsh_addr, xsh_sizeof, off) < 1422 CAST(ssize_t, xsh_sizeof)) { 1423 if (file_printf(ms, ", can't read elf section at %jd", 1424 (intmax_t)off) == -1) 1425 return -1; 1426 return 0; 1427 } 1428 off += size; 1429 1430 /* Things we can determine before we seek */ 1431 switch (xsh_type) { 1432 case SHT_SYMTAB: 1433 #if 0 1434 case SHT_DYNSYM: 1435 #endif 1436 stripped = 0; 1437 break; 1438 default: 1439 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1440 /* Perhaps warn here */ 1441 continue; 1442 } 1443 break; 1444 } 1445 1446 1447 /* Things we can determine when we seek */ 1448 switch (xsh_type) { 1449 case SHT_NOTE: 1450 if (CAST(uintmax_t, (xsh_size + xsh_offset)) > 1451 CAST(uintmax_t, fsize)) { 1452 if (file_printf(ms, 1453 ", note offset/size %#" INTMAX_T_FORMAT 1454 "x+%#" INTMAX_T_FORMAT "x exceeds" 1455 " file size %#" INTMAX_T_FORMAT "x", 1456 CAST(uintmax_t, xsh_offset), 1457 CAST(uintmax_t, xsh_size), 1458 CAST(uintmax_t, fsize)) == -1) 1459 return -1; 1460 return 0; 1461 } 1462 if (xsh_size > MAX_SHSIZE) { 1463 file_error(ms, errno, "Note section size too " 1464 "big (%ju > %u)", (uintmax_t)xsh_size, 1465 MAX_SHSIZE); 1466 return -1; 1467 } 1468 if ((nbuf = malloc(xsh_size)) == NULL) { 1469 file_error(ms, errno, "Cannot allocate memory" 1470 " for note"); 1471 return -1; 1472 } 1473 offs = xsh_offset; 1474 if (pread(fd, nbuf, xsh_size, offs) < 1475 CAST(ssize_t, xsh_size)) { 1476 free(nbuf); 1477 if (file_printf(ms, 1478 ", can't read elf note at %jd", 1479 (intmax_t)offs) == -1) 1480 return -1; 1481 return 0; 1482 } 1483 1484 noff = 0; 1485 for (;;) { 1486 if (noff >= CAST(off_t, xsh_size)) 1487 break; 1488 noff = donote(ms, nbuf, CAST(size_t, noff), 1489 xsh_size, clazz, swap, 4, flags, notecount, 1490 fd, 0, 0, 0); 1491 if (noff == 0) 1492 break; 1493 } 1494 free(nbuf); 1495 break; 1496 case SHT_SUNW_cap: 1497 switch (mach) { 1498 case EM_SPARC: 1499 case EM_SPARCV9: 1500 case EM_IA_64: 1501 case EM_386: 1502 case EM_AMD64: 1503 break; 1504 default: 1505 goto skip; 1506 } 1507 1508 if (nbadcap > 5) 1509 break; 1510 if (lseek(fd, xsh_offset, SEEK_SET) 1511 == CAST(off_t, -1)) { 1512 file_badseek(ms); 1513 return -1; 1514 } 1515 coff = 0; 1516 for (;;) { 1517 Elf32_Cap cap32; 1518 Elf64_Cap cap64; 1519 char cbuf[/*CONSTCOND*/ 1520 MAX(sizeof(cap32), sizeof(cap64))]; 1521 if ((coff += xcap_sizeof) > 1522 CAST(off_t, xsh_size)) 1523 break; 1524 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) != 1525 CAST(ssize_t, xcap_sizeof)) { 1526 file_badread(ms); 1527 return -1; 1528 } 1529 if (cbuf[0] == 'A') { 1530 #ifdef notyet 1531 char *p = cbuf + 1; 1532 uint32_t len, tag; 1533 memcpy(&len, p, sizeof(len)); 1534 p += 4; 1535 len = getu32(swap, len); 1536 if (memcmp("gnu", p, 3) != 0) { 1537 if (file_printf(ms, 1538 ", unknown capability %.3s", p) 1539 == -1) 1540 return -1; 1541 break; 1542 } 1543 p += strlen(p) + 1; 1544 tag = *p++; 1545 memcpy(&len, p, sizeof(len)); 1546 p += 4; 1547 len = getu32(swap, len); 1548 if (tag != 1) { 1549 if (file_printf(ms, ", unknown gnu" 1550 " capability tag %d", tag) 1551 == -1) 1552 return -1; 1553 break; 1554 } 1555 // gnu attributes 1556 #endif 1557 break; 1558 } 1559 memcpy(xcap_addr, cbuf, xcap_sizeof); 1560 switch (xcap_tag) { 1561 case CA_SUNW_NULL: 1562 break; 1563 case CA_SUNW_HW_1: 1564 cap_hw1 |= xcap_val; 1565 break; 1566 case CA_SUNW_SF_1: 1567 cap_sf1 |= xcap_val; 1568 break; 1569 default: 1570 if (file_printf(ms, 1571 ", with unknown capability " 1572 "%#" INT64_T_FORMAT "x = %#" 1573 INT64_T_FORMAT "x", 1574 CAST(unsigned long long, xcap_tag), 1575 CAST(unsigned long long, xcap_val)) 1576 == -1) 1577 return -1; 1578 if (nbadcap++ > 2) 1579 coff = xsh_size; 1580 break; 1581 } 1582 } 1583 /*FALLTHROUGH*/ 1584 skip: 1585 default: 1586 break; 1587 } 1588 } 1589 1590 if (has_debug_info) { 1591 if (file_printf(ms, ", with debug_info") == -1) 1592 return -1; 1593 } 1594 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1595 return -1; 1596 if (cap_hw1) { 1597 const cap_desc_t *cdp; 1598 switch (mach) { 1599 case EM_SPARC: 1600 case EM_SPARC32PLUS: 1601 case EM_SPARCV9: 1602 cdp = cap_desc_sparc; 1603 break; 1604 case EM_386: 1605 case EM_IA_64: 1606 case EM_AMD64: 1607 cdp = cap_desc_386; 1608 break; 1609 default: 1610 cdp = NULL; 1611 break; 1612 } 1613 if (file_printf(ms, ", uses") == -1) 1614 return -1; 1615 if (cdp) { 1616 while (cdp->cd_name) { 1617 if (cap_hw1 & cdp->cd_mask) { 1618 if (file_printf(ms, 1619 " %s", cdp->cd_name) == -1) 1620 return -1; 1621 cap_hw1 &= ~cdp->cd_mask; 1622 } 1623 ++cdp; 1624 } 1625 if (cap_hw1) 1626 if (file_printf(ms, 1627 " unknown hardware capability %#" 1628 INT64_T_FORMAT "x", 1629 CAST(unsigned long long, cap_hw1)) == -1) 1630 return -1; 1631 } else { 1632 if (file_printf(ms, 1633 " hardware capability %#" INT64_T_FORMAT "x", 1634 CAST(unsigned long long, cap_hw1)) == -1) 1635 return -1; 1636 } 1637 } 1638 if (cap_sf1) { 1639 if (cap_sf1 & SF1_SUNW_FPUSED) { 1640 if (file_printf(ms, 1641 (cap_sf1 & SF1_SUNW_FPKNWN) 1642 ? ", uses frame pointer" 1643 : ", not known to use frame pointer") == -1) 1644 return -1; 1645 } 1646 cap_sf1 &= ~SF1_SUNW_MASK; 1647 if (cap_sf1) 1648 if (file_printf(ms, 1649 ", with unknown software capability %#" 1650 INT64_T_FORMAT "x", 1651 CAST(unsigned long long, cap_sf1)) == -1) 1652 return -1; 1653 } 1654 return 0; 1655 } 1656 1657 /* 1658 * Look through the program headers of an executable image, to determine 1659 * if it is statically or dynamically linked. If it has a dynamic section, 1660 * it is pie, and does not have an interpreter or needed libraries, we 1661 * call it static pie. 1662 */ 1663 private int 1664 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1665 int num, size_t size, off_t fsize, int sh_num, int *flags, 1666 uint16_t *notecount) 1667 { 1668 Elf32_Phdr ph32; 1669 Elf64_Phdr ph64; 1670 const char *linking_style; 1671 unsigned char nbuf[BUFSIZ]; 1672 char ibuf[BUFSIZ]; 1673 char interp[BUFSIZ]; 1674 ssize_t bufsize; 1675 size_t offset, align, need = 0; 1676 int pie = 0, dynamic = 0; 1677 1678 if (num == 0) { 1679 if (file_printf(ms, ", no program header") == -1) 1680 return -1; 1681 return 0; 1682 } 1683 if (size != xph_sizeof) { 1684 if (file_printf(ms, ", corrupted program header size") == -1) 1685 return -1; 1686 return 0; 1687 } 1688 1689 interp[0] = '\0'; 1690 for ( ; num; num--) { 1691 int doread; 1692 if (pread(fd, xph_addr, xph_sizeof, off) < 1693 CAST(ssize_t, xph_sizeof)) { 1694 if (file_printf(ms, 1695 ", can't read elf program headers at %jd", 1696 (intmax_t)off) == -1) 1697 return -1; 1698 return 0; 1699 } 1700 1701 off += size; 1702 bufsize = 0; 1703 align = 4; 1704 1705 /* Things we can determine before we seek */ 1706 switch (xph_type) { 1707 case PT_DYNAMIC: 1708 doread = 1; 1709 break; 1710 case PT_NOTE: 1711 if (sh_num) /* Did this through section headers */ 1712 continue; 1713 if (((align = xph_align) & 0x80000000UL) != 0 || 1714 align < 4) { 1715 if (file_printf(ms, 1716 ", invalid note alignment %#lx", 1717 CAST(unsigned long, align)) == -1) 1718 return -1; 1719 align = 4; 1720 } 1721 /*FALLTHROUGH*/ 1722 case PT_INTERP: 1723 doread = 1; 1724 break; 1725 default: 1726 doread = 0; 1727 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1728 /* Maybe warn here? */ 1729 continue; 1730 } 1731 break; 1732 } 1733 1734 if (doread) { 1735 size_t len = xph_filesz < sizeof(nbuf) ? xph_filesz 1736 : sizeof(nbuf); 1737 off_t offs = xph_offset; 1738 bufsize = pread(fd, nbuf, len, offs); 1739 if (bufsize == -1) { 1740 if (file_printf(ms, 1741 ", can't read section at %jd", 1742 (intmax_t)offs) == -1) 1743 return -1; 1744 return 0; 1745 } 1746 } 1747 1748 /* Things we can determine when we seek */ 1749 switch (xph_type) { 1750 case PT_DYNAMIC: 1751 dynamic = 1; 1752 offset = 0; 1753 // Let DF_1 determine if we are PIE or not. 1754 ms->mode &= ~0111; 1755 for (;;) { 1756 if (offset >= CAST(size_t, bufsize)) 1757 break; 1758 offset = dodynamic(ms, nbuf, offset, 1759 CAST(size_t, bufsize), clazz, swap, 1760 &pie, &need); 1761 if (offset == 0) 1762 break; 1763 } 1764 if (ms->flags & MAGIC_MIME) 1765 continue; 1766 break; 1767 1768 case PT_INTERP: 1769 need++; 1770 if (ms->flags & MAGIC_MIME) 1771 continue; 1772 if (bufsize && nbuf[0]) { 1773 nbuf[bufsize - 1] = '\0'; 1774 memcpy(interp, nbuf, CAST(size_t, bufsize)); 1775 } else 1776 strlcpy(interp, "*empty*", sizeof(interp)); 1777 break; 1778 case PT_NOTE: 1779 if (ms->flags & MAGIC_MIME) 1780 return 0; 1781 /* 1782 * This is a PT_NOTE section; loop through all the notes 1783 * in the section. 1784 */ 1785 offset = 0; 1786 for (;;) { 1787 if (offset >= CAST(size_t, bufsize)) 1788 break; 1789 offset = donote(ms, nbuf, offset, 1790 CAST(size_t, bufsize), clazz, swap, align, 1791 flags, notecount, fd, 0, 0, 0); 1792 if (offset == 0) 1793 break; 1794 } 1795 break; 1796 default: 1797 if (ms->flags & MAGIC_MIME) 1798 continue; 1799 break; 1800 } 1801 } 1802 if (ms->flags & MAGIC_MIME) 1803 return 0; 1804 if (dynamic) { 1805 if (pie && need == 0) 1806 linking_style = "static-pie"; 1807 else 1808 linking_style = "dynamically"; 1809 } else { 1810 linking_style = "statically"; 1811 } 1812 if (file_printf(ms, ", %s linked", linking_style) == -1) 1813 return -1; 1814 if (interp[0]) 1815 if (file_printf(ms, ", interpreter %s", file_printable(ms, 1816 ibuf, sizeof(ibuf), interp, sizeof(interp))) == -1) 1817 return -1; 1818 return 0; 1819 } 1820 1821 1822 protected int 1823 file_tryelf(struct magic_set *ms, const struct buffer *b) 1824 { 1825 int fd = b->fd; 1826 const unsigned char *buf = CAST(const unsigned char *, b->fbuf); 1827 size_t nbytes = b->flen; 1828 union { 1829 int32_t l; 1830 char c[sizeof(int32_t)]; 1831 } u; 1832 int clazz; 1833 int swap; 1834 struct stat st; 1835 const struct stat *stp; 1836 off_t fsize; 1837 int flags = 0; 1838 Elf32_Ehdr elf32hdr; 1839 Elf64_Ehdr elf64hdr; 1840 uint16_t type, phnum, shnum, notecount; 1841 1842 if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION)) 1843 return 0; 1844 /* 1845 * ELF executables have multiple section headers in arbitrary 1846 * file locations and thus file(1) cannot determine it from easily. 1847 * Instead we traverse thru all section headers until a symbol table 1848 * one is found or else the binary is stripped. 1849 * Return immediately if it's not ELF (so we avoid pipe2file unless 1850 * needed). 1851 */ 1852 if (buf[EI_MAG0] != ELFMAG0 1853 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1854 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1855 return 0; 1856 1857 /* 1858 * If we cannot seek, it must be a pipe, socket or fifo. 1859 */ 1860 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) 1861 && (errno == ESPIPE)) 1862 fd = file_pipe2file(ms, fd, buf, nbytes); 1863 1864 if (fd == -1) { 1865 file_badread(ms); 1866 return -1; 1867 } 1868 1869 stp = &b->st; 1870 /* 1871 * b->st.st_size != 0 if previous fstat() succeeded, 1872 * which is likely, we can avoid extra stat() call. 1873 */ 1874 if (b->st.st_size == 0) { 1875 stp = &st; 1876 if (fstat(fd, &st) == -1) { 1877 file_badread(ms); 1878 return -1; 1879 } 1880 } 1881 if (S_ISREG(stp->st_mode) || stp->st_size != 0) 1882 fsize = stp->st_size; 1883 else 1884 fsize = SIZE_UNKNOWN; 1885 1886 clazz = buf[EI_CLASS]; 1887 1888 switch (clazz) { 1889 case ELFCLASS32: 1890 #undef elf_getu 1891 #define elf_getu(a, b) elf_getu32(a, b) 1892 #undef elfhdr 1893 #define elfhdr elf32hdr 1894 #include "elfclass.h" 1895 case ELFCLASS64: 1896 #undef elf_getu 1897 #define elf_getu(a, b) elf_getu64(a, b) 1898 #undef elfhdr 1899 #define elfhdr elf64hdr 1900 #include "elfclass.h" 1901 default: 1902 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1903 return -1; 1904 break; 1905 } 1906 return 0; 1907 } 1908 #endif 1909