1 /* 2 * Copyright (c) Christos Zoulas 2003. 3 * All Rights Reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice immediately at the beginning of the file, without modification, 10 * this list of conditions, and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 #include "file.h" 28 29 #ifndef lint 30 FILE_RCSID("@(#)$File: readelf.c,v 1.178 2021/06/30 10:08:48 christos Exp $") 31 #endif 32 33 #ifdef BUILTIN_ELF 34 #include <string.h> 35 #include <ctype.h> 36 #include <stdlib.h> 37 #ifdef HAVE_UNISTD_H 38 #include <unistd.h> 39 #endif 40 41 #include "readelf.h" 42 #include "magic.h" 43 44 #ifdef ELFCORE 45 private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t, 46 off_t, int *, uint16_t *); 47 #endif 48 private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t, 49 off_t, int, int *, uint16_t *); 50 private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, 51 off_t, int, int, int *, uint16_t *); 52 private size_t donote(struct magic_set *, void *, size_t, size_t, int, 53 int, size_t, int *, uint16_t *, int, off_t, int, off_t); 54 55 #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) 56 57 #define isquote(c) (strchr("'\"`", (c)) != NULL) 58 59 private uint16_t getu16(int, uint16_t); 60 private uint32_t getu32(int, uint32_t); 61 private uint64_t getu64(int, uint64_t); 62 63 #define MAX_PHNUM 128 64 #define MAX_SHNUM 32768 65 #define SIZE_UNKNOWN CAST(off_t, -1) 66 67 private int 68 toomany(struct magic_set *ms, const char *name, uint16_t num) 69 { 70 if (ms->flags & MAGIC_MIME) 71 return 1; 72 if (file_printf(ms, ", too many %s (%u)", name, num) == -1) 73 return -1; 74 return 1; 75 } 76 77 private uint16_t 78 getu16(int swap, uint16_t value) 79 { 80 union { 81 uint16_t ui; 82 char c[2]; 83 } retval, tmpval; 84 85 if (swap) { 86 tmpval.ui = value; 87 88 retval.c[0] = tmpval.c[1]; 89 retval.c[1] = tmpval.c[0]; 90 91 return retval.ui; 92 } else 93 return value; 94 } 95 96 private uint32_t 97 getu32(int swap, uint32_t value) 98 { 99 union { 100 uint32_t ui; 101 char c[4]; 102 } retval, tmpval; 103 104 if (swap) { 105 tmpval.ui = value; 106 107 retval.c[0] = tmpval.c[3]; 108 retval.c[1] = tmpval.c[2]; 109 retval.c[2] = tmpval.c[1]; 110 retval.c[3] = tmpval.c[0]; 111 112 return retval.ui; 113 } else 114 return value; 115 } 116 117 private uint64_t 118 getu64(int swap, uint64_t value) 119 { 120 union { 121 uint64_t ui; 122 char c[8]; 123 } retval, tmpval; 124 125 if (swap) { 126 tmpval.ui = value; 127 128 retval.c[0] = tmpval.c[7]; 129 retval.c[1] = tmpval.c[6]; 130 retval.c[2] = tmpval.c[5]; 131 retval.c[3] = tmpval.c[4]; 132 retval.c[4] = tmpval.c[3]; 133 retval.c[5] = tmpval.c[2]; 134 retval.c[6] = tmpval.c[1]; 135 retval.c[7] = tmpval.c[0]; 136 137 return retval.ui; 138 } else 139 return value; 140 } 141 142 #define elf_getu16(swap, value) getu16(swap, value) 143 #define elf_getu32(swap, value) getu32(swap, value) 144 #define elf_getu64(swap, value) getu64(swap, value) 145 146 #define xsh_addr (clazz == ELFCLASS32 \ 147 ? CAST(void *, &sh32) \ 148 : CAST(void *, &sh64)) 149 #define xsh_sizeof (clazz == ELFCLASS32 \ 150 ? sizeof(sh32) \ 151 : sizeof(sh64)) 152 #define xsh_size CAST(size_t, (clazz == ELFCLASS32 \ 153 ? elf_getu32(swap, sh32.sh_size) \ 154 : elf_getu64(swap, sh64.sh_size))) 155 #define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \ 156 ? elf_getu32(swap, sh32.sh_offset) \ 157 : elf_getu64(swap, sh64.sh_offset))) 158 #define xsh_type (clazz == ELFCLASS32 \ 159 ? elf_getu32(swap, sh32.sh_type) \ 160 : elf_getu32(swap, sh64.sh_type)) 161 #define xsh_name (clazz == ELFCLASS32 \ 162 ? elf_getu32(swap, sh32.sh_name) \ 163 : elf_getu32(swap, sh64.sh_name)) 164 165 #define xph_addr (clazz == ELFCLASS32 \ 166 ? CAST(void *, &ph32) \ 167 : CAST(void *, &ph64)) 168 #define xph_sizeof (clazz == ELFCLASS32 \ 169 ? sizeof(ph32) \ 170 : sizeof(ph64)) 171 #define xph_type (clazz == ELFCLASS32 \ 172 ? elf_getu32(swap, ph32.p_type) \ 173 : elf_getu32(swap, ph64.p_type)) 174 #define xph_offset CAST(off_t, (clazz == ELFCLASS32 \ 175 ? elf_getu32(swap, ph32.p_offset) \ 176 : elf_getu64(swap, ph64.p_offset))) 177 #define xph_align CAST(size_t, (clazz == ELFCLASS32 \ 178 ? CAST(off_t, (ph32.p_align ? \ 179 elf_getu32(swap, ph32.p_align) : 4))\ 180 : CAST(off_t, (ph64.p_align ? \ 181 elf_getu64(swap, ph64.p_align) : 4)))) 182 #define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \ 183 ? CAST(off_t, (ph32.p_vaddr ? \ 184 elf_getu32(swap, ph32.p_vaddr) : 4))\ 185 : CAST(off_t, (ph64.p_vaddr ? \ 186 elf_getu64(swap, ph64.p_vaddr) : 4)))) 187 #define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \ 188 ? elf_getu32(swap, ph32.p_filesz) \ 189 : elf_getu64(swap, ph64.p_filesz))) 190 #define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \ 191 ? elf_getu32(swap, ph32.p_memsz) \ 192 : elf_getu64(swap, ph64.p_memsz)))) 193 #define xnh_addr (clazz == ELFCLASS32 \ 194 ? CAST(void *, &nh32) \ 195 : CAST(void *, &nh64)) 196 #define xnh_sizeof (clazz == ELFCLASS32 \ 197 ? sizeof(nh32) \ 198 : sizeof(nh64)) 199 #define xnh_type (clazz == ELFCLASS32 \ 200 ? elf_getu32(swap, nh32.n_type) \ 201 : elf_getu32(swap, nh64.n_type)) 202 #define xnh_namesz (clazz == ELFCLASS32 \ 203 ? elf_getu32(swap, nh32.n_namesz) \ 204 : elf_getu32(swap, nh64.n_namesz)) 205 #define xnh_descsz (clazz == ELFCLASS32 \ 206 ? elf_getu32(swap, nh32.n_descsz) \ 207 : elf_getu32(swap, nh64.n_descsz)) 208 209 #define xdh_addr (clazz == ELFCLASS32 \ 210 ? CAST(void *, &dh32) \ 211 : CAST(void *, &dh64)) 212 #define xdh_sizeof (clazz == ELFCLASS32 \ 213 ? sizeof(dh32) \ 214 : sizeof(dh64)) 215 #define xdh_tag (clazz == ELFCLASS32 \ 216 ? elf_getu32(swap, dh32.d_tag) \ 217 : elf_getu64(swap, dh64.d_tag)) 218 #define xdh_val (clazz == ELFCLASS32 \ 219 ? elf_getu32(swap, dh32.d_un.d_val) \ 220 : elf_getu64(swap, dh64.d_un.d_val)) 221 222 #define xcap_addr (clazz == ELFCLASS32 \ 223 ? CAST(void *, &cap32) \ 224 : CAST(void *, &cap64)) 225 #define xcap_sizeof (clazz == ELFCLASS32 \ 226 ? sizeof(cap32) \ 227 : sizeof(cap64)) 228 #define xcap_tag (clazz == ELFCLASS32 \ 229 ? elf_getu32(swap, cap32.c_tag) \ 230 : elf_getu64(swap, cap64.c_tag)) 231 #define xcap_val (clazz == ELFCLASS32 \ 232 ? elf_getu32(swap, cap32.c_un.c_val) \ 233 : elf_getu64(swap, cap64.c_un.c_val)) 234 235 #define xauxv_addr (clazz == ELFCLASS32 \ 236 ? CAST(void *, &auxv32) \ 237 : CAST(void *, &auxv64)) 238 #define xauxv_sizeof (clazz == ELFCLASS32 \ 239 ? sizeof(auxv32) \ 240 : sizeof(auxv64)) 241 #define xauxv_type (clazz == ELFCLASS32 \ 242 ? elf_getu32(swap, auxv32.a_type) \ 243 : elf_getu64(swap, auxv64.a_type)) 244 #define xauxv_val (clazz == ELFCLASS32 \ 245 ? elf_getu32(swap, auxv32.a_v) \ 246 : elf_getu64(swap, auxv64.a_v)) 247 248 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 249 ? prpsoffsets32[i] \ 250 : prpsoffsets64[i]) 251 252 #ifdef ELFCORE 253 /* 254 * Try larger offsets first to avoid false matches 255 * from earlier data that happen to look like strings. 256 */ 257 static const size_t prpsoffsets32[] = { 258 #ifdef USE_NT_PSINFO 259 104, /* SunOS 5.x (command line) */ 260 88, /* SunOS 5.x (short name) */ 261 #endif /* USE_NT_PSINFO */ 262 263 100, /* SunOS 5.x (command line) */ 264 84, /* SunOS 5.x (short name) */ 265 266 44, /* Linux (command line) */ 267 28, /* Linux (short name) */ 268 269 48, /* Linux PowerPC (command line) */ 270 32, /* Linux PowerPC (short name) */ 271 272 8, /* FreeBSD */ 273 }; 274 275 static const size_t prpsoffsets64[] = { 276 #ifdef USE_NT_PSINFO 277 152, /* SunOS 5.x (command line) */ 278 136, /* SunOS 5.x (short name) */ 279 #endif /* USE_NT_PSINFO */ 280 281 136, /* SunOS 5.x, 64-bit (command line) */ 282 120, /* SunOS 5.x, 64-bit (short name) */ 283 284 56, /* Linux (command line) */ 285 40, /* Linux (tested on core from 2.4.x, short name) */ 286 287 16, /* FreeBSD, 64-bit */ 288 }; 289 290 #define NOFFSETS32 __arraycount(prpsoffsets32) 291 #define NOFFSETS64 __arraycount(prpsoffsets64) 292 293 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 294 295 /* 296 * Look through the program headers of an executable image, searching 297 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 298 * "FreeBSD"; if one is found, try looking in various places in its 299 * contents for a 16-character string containing only printable 300 * characters - if found, that string should be the name of the program 301 * that dropped core. Note: right after that 16-character string is, 302 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 303 * Linux, a longer string (80 characters, in 5.x, probably other 304 * SVR4-flavored systems, and Linux) containing the start of the 305 * command line for that program. 306 * 307 * SunOS 5.x core files contain two PT_NOTE sections, with the types 308 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 309 * same info about the command name and command line, so it probably 310 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 311 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 312 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 313 * the SunOS 5.x file command relies on this (and prefers the latter). 314 * 315 * The signal number probably appears in a section of type NT_PRSTATUS, 316 * but that's also rather OS-dependent, in ways that are harder to 317 * dissect with heuristics, so I'm not bothering with the signal number. 318 * (I suppose the signal number could be of interest in situations where 319 * you don't have the binary of the program that dropped core; if you 320 * *do* have that binary, the debugger will probably tell you what 321 * signal it was.) 322 */ 323 324 #define OS_STYLE_SVR4 0 325 #define OS_STYLE_FREEBSD 1 326 #define OS_STYLE_NETBSD 2 327 328 private const char os_style_names[][8] = { 329 "SVR4", 330 "FreeBSD", 331 "NetBSD", 332 }; 333 334 #define FLAGS_CORE_STYLE 0x0003 335 336 #define FLAGS_DID_CORE 0x0004 337 #define FLAGS_DID_OS_NOTE 0x0008 338 #define FLAGS_DID_BUILD_ID 0x0010 339 #define FLAGS_DID_CORE_STYLE 0x0020 340 #define FLAGS_DID_NETBSD_PAX 0x0040 341 #define FLAGS_DID_NETBSD_MARCH 0x0080 342 #define FLAGS_DID_NETBSD_CMODEL 0x0100 343 #define FLAGS_DID_NETBSD_EMULATION 0x0200 344 #define FLAGS_DID_NETBSD_UNKNOWN 0x0400 345 #define FLAGS_IS_CORE 0x0800 346 #define FLAGS_DID_AUXV 0x1000 347 348 private int 349 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 350 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 351 { 352 Elf32_Phdr ph32; 353 Elf64_Phdr ph64; 354 size_t offset, len; 355 unsigned char nbuf[BUFSIZ]; 356 ssize_t bufsize; 357 off_t ph_off = off, offs; 358 int ph_num = num; 359 360 if (ms->flags & MAGIC_MIME) 361 return 0; 362 363 if (num == 0) { 364 if (file_printf(ms, ", no program header") == -1) 365 return -1; 366 return 0; 367 } 368 if (size != xph_sizeof) { 369 if (file_printf(ms, ", corrupted program header size") == -1) 370 return -1; 371 return 0; 372 } 373 374 /* 375 * Loop through all the program headers. 376 */ 377 for ( ; num; num--) { 378 if (pread(fd, xph_addr, xph_sizeof, off) < 379 CAST(ssize_t, xph_sizeof)) { 380 if (file_printf(ms, 381 ", can't read elf program headers at %jd", 382 (intmax_t)off) == -1) 383 return -1; 384 return 0; 385 } 386 off += size; 387 388 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 389 /* Perhaps warn here */ 390 continue; 391 } 392 393 if (xph_type != PT_NOTE) 394 continue; 395 396 /* 397 * This is a PT_NOTE section; loop through all the notes 398 * in the section. 399 */ 400 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 401 offs = xph_offset; 402 if ((bufsize = pread(fd, nbuf, len, offs)) == -1) { 403 if (file_printf(ms, " can't read note section at %jd", 404 (intmax_t)offs) == -1) 405 return -1; 406 return 0; 407 } 408 offset = 0; 409 for (;;) { 410 if (offset >= CAST(size_t, bufsize)) 411 break; 412 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize), 413 clazz, swap, 4, flags, notecount, fd, ph_off, 414 ph_num, fsize); 415 if (offset == 0) 416 break; 417 418 } 419 } 420 return 0; 421 } 422 #endif 423 424 static int 425 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 426 { 427 uint32_t desc; 428 memcpy(&desc, v, sizeof(desc)); 429 desc = elf_getu32(swap, desc); 430 431 if (file_printf(ms, ", for NetBSD") == -1) 432 return -1; 433 /* 434 * The version number used to be stuck as 199905, and was thus 435 * basically content-free. Newer versions of NetBSD have fixed 436 * this and now use the encoding of __NetBSD_Version__: 437 * 438 * MMmmrrpp00 439 * 440 * M = major version 441 * m = minor version 442 * r = release ["",A-Z,Z[A-Z] but numeric] 443 * p = patchlevel 444 */ 445 if (desc > 100000000U) { 446 uint32_t ver_patch = (desc / 100) % 100; 447 uint32_t ver_rel = (desc / 10000) % 100; 448 uint32_t ver_min = (desc / 1000000) % 100; 449 uint32_t ver_maj = desc / 100000000; 450 451 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 452 return -1; 453 if (ver_rel == 0 && ver_patch != 0) { 454 if (file_printf(ms, ".%u", ver_patch) == -1) 455 return -1; 456 } else if (ver_rel != 0) { 457 while (ver_rel > 26) { 458 if (file_printf(ms, "Z") == -1) 459 return -1; 460 ver_rel -= 26; 461 } 462 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 463 == -1) 464 return -1; 465 } 466 } 467 return 0; 468 } 469 470 static int 471 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 472 { 473 uint32_t desc; 474 475 memcpy(&desc, v, sizeof(desc)); 476 desc = elf_getu32(swap, desc); 477 if (file_printf(ms, ", for FreeBSD") == -1) 478 return -1; 479 480 /* 481 * Contents is __FreeBSD_version, whose relation to OS 482 * versions is defined by a huge table in the Porter's 483 * Handbook. This is the general scheme: 484 * 485 * Releases: 486 * Mmp000 (before 4.10) 487 * Mmi0p0 (before 5.0) 488 * Mmm0p0 489 * 490 * Development branches: 491 * Mmpxxx (before 4.6) 492 * Mmp1xx (before 4.10) 493 * Mmi1xx (before 5.0) 494 * M000xx (pre-M.0) 495 * Mmm1xx 496 * 497 * M = major version 498 * m = minor version 499 * i = minor version increment (491000 -> 4.10) 500 * p = patchlevel 501 * x = revision 502 * 503 * The first release of FreeBSD to use ELF by default 504 * was version 3.0. 505 */ 506 if (desc == 460002) { 507 if (file_printf(ms, " 4.6.2") == -1) 508 return -1; 509 } else if (desc < 460100) { 510 if (file_printf(ms, " %d.%d", desc / 100000, 511 desc / 10000 % 10) == -1) 512 return -1; 513 if (desc / 1000 % 10 > 0) 514 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 515 return -1; 516 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 517 if (file_printf(ms, " (%d)", desc) == -1) 518 return -1; 519 } else if (desc < 500000) { 520 if (file_printf(ms, " %d.%d", desc / 100000, 521 desc / 10000 % 10 + desc / 1000 % 10) == -1) 522 return -1; 523 if (desc / 100 % 10 > 0) { 524 if (file_printf(ms, " (%d)", desc) == -1) 525 return -1; 526 } else if (desc / 10 % 10 > 0) { 527 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 528 return -1; 529 } 530 } else { 531 if (file_printf(ms, " %d.%d", desc / 100000, 532 desc / 1000 % 100) == -1) 533 return -1; 534 if ((desc / 100 % 10 > 0) || 535 (desc % 100000 / 100 == 0)) { 536 if (file_printf(ms, " (%d)", desc) == -1) 537 return -1; 538 } else if (desc / 10 % 10 > 0) { 539 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 540 return -1; 541 } 542 } 543 return 0; 544 } 545 546 private int 547 /*ARGSUSED*/ 548 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 549 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 550 size_t noff, size_t doff, int *flags) 551 { 552 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 && 553 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) { 554 uint8_t desc[20]; 555 const char *btype; 556 uint32_t i; 557 *flags |= FLAGS_DID_BUILD_ID; 558 switch (descsz) { 559 case 8: 560 btype = "xxHash"; 561 break; 562 case 16: 563 btype = "md5/uuid"; 564 break; 565 case 20: 566 btype = "sha1"; 567 break; 568 default: 569 btype = "unknown"; 570 break; 571 } 572 if (file_printf(ms, ", BuildID[%s]=", btype) == -1) 573 return -1; 574 memcpy(desc, &nbuf[doff], descsz); 575 for (i = 0; i < descsz; i++) 576 if (file_printf(ms, "%02x", desc[i]) == -1) 577 return -1; 578 return 1; 579 } 580 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 && 581 type == NT_GO_BUILD_ID && descsz < 128) { 582 char buf[256]; 583 if (file_printf(ms, ", Go BuildID=%s", 584 file_copystr(buf, sizeof(buf), descsz, 585 RCAST(const char *, &nbuf[doff]))) == -1) 586 return -1; 587 return 1; 588 } 589 return 0; 590 } 591 592 private int 593 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 594 int swap, uint32_t namesz, uint32_t descsz, 595 size_t noff, size_t doff, int *flags) 596 { 597 const char *name = RCAST(const char *, &nbuf[noff]); 598 599 if (namesz == 5 && strcmp(name, "SuSE") == 0 && 600 type == NT_GNU_VERSION && descsz == 2) { 601 *flags |= FLAGS_DID_OS_NOTE; 602 if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff], 603 nbuf[doff + 1]) == -1) 604 return -1; 605 return 1; 606 } 607 608 if (namesz == 4 && strcmp(name, "GNU") == 0 && 609 type == NT_GNU_VERSION && descsz == 16) { 610 uint32_t desc[4]; 611 memcpy(desc, &nbuf[doff], sizeof(desc)); 612 613 *flags |= FLAGS_DID_OS_NOTE; 614 if (file_printf(ms, ", for GNU/") == -1) 615 return -1; 616 switch (elf_getu32(swap, desc[0])) { 617 case GNU_OS_LINUX: 618 if (file_printf(ms, "Linux") == -1) 619 return -1; 620 break; 621 case GNU_OS_HURD: 622 if (file_printf(ms, "Hurd") == -1) 623 return -1; 624 break; 625 case GNU_OS_SOLARIS: 626 if (file_printf(ms, "Solaris") == -1) 627 return -1; 628 break; 629 case GNU_OS_KFREEBSD: 630 if (file_printf(ms, "kFreeBSD") == -1) 631 return -1; 632 break; 633 case GNU_OS_KNETBSD: 634 if (file_printf(ms, "kNetBSD") == -1) 635 return -1; 636 break; 637 default: 638 if (file_printf(ms, "<unknown>") == -1) 639 return -1; 640 } 641 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 642 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 643 return -1; 644 return 1; 645 } 646 647 if (namesz == 7 && strcmp(name, "NetBSD") == 0) { 648 if (type == NT_NETBSD_VERSION && descsz == 4) { 649 *flags |= FLAGS_DID_OS_NOTE; 650 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1) 651 return -1; 652 return 1; 653 } 654 } 655 656 if (namesz == 8 && strcmp(name, "FreeBSD") == 0) { 657 if (type == NT_FREEBSD_VERSION && descsz == 4) { 658 *flags |= FLAGS_DID_OS_NOTE; 659 if (do_note_freebsd_version(ms, swap, &nbuf[doff]) 660 == -1) 661 return -1; 662 return 1; 663 } 664 } 665 666 if (namesz == 8 && strcmp(name, "OpenBSD") == 0 && 667 type == NT_OPENBSD_VERSION && descsz == 4) { 668 *flags |= FLAGS_DID_OS_NOTE; 669 if (file_printf(ms, ", for OpenBSD") == -1) 670 return -1; 671 /* Content of note is always 0 */ 672 return 1; 673 } 674 675 if (namesz == 10 && strcmp(name, "DragonFly") == 0 && 676 type == NT_DRAGONFLY_VERSION && descsz == 4) { 677 uint32_t desc; 678 *flags |= FLAGS_DID_OS_NOTE; 679 if (file_printf(ms, ", for DragonFly") == -1) 680 return -1; 681 memcpy(&desc, &nbuf[doff], sizeof(desc)); 682 desc = elf_getu32(swap, desc); 683 if (file_printf(ms, " %d.%d.%d", desc / 100000, 684 desc / 10000 % 10, desc % 10000) == -1) 685 return -1; 686 return 1; 687 } 688 return 0; 689 } 690 691 private int 692 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 693 int swap, uint32_t namesz, uint32_t descsz, 694 size_t noff, size_t doff, int *flags) 695 { 696 const char *name = RCAST(const char *, &nbuf[noff]); 697 698 if (namesz == 4 && strcmp(name, "PaX") == 0 && 699 type == NT_NETBSD_PAX && descsz == 4) { 700 static const char *pax[] = { 701 "+mprotect", 702 "-mprotect", 703 "+segvguard", 704 "-segvguard", 705 "+ASLR", 706 "-ASLR", 707 }; 708 uint32_t desc; 709 size_t i; 710 int did = 0; 711 712 *flags |= FLAGS_DID_NETBSD_PAX; 713 memcpy(&desc, &nbuf[doff], sizeof(desc)); 714 desc = elf_getu32(swap, desc); 715 716 if (desc && file_printf(ms, ", PaX: ") == -1) 717 return -1; 718 719 for (i = 0; i < __arraycount(pax); i++) { 720 if (((1 << CAST(int, i)) & desc) == 0) 721 continue; 722 if (file_printf(ms, "%s%s", did++ ? "," : "", 723 pax[i]) == -1) 724 return -1; 725 } 726 return 1; 727 } 728 return 0; 729 } 730 731 private int 732 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 733 int swap, uint32_t namesz, uint32_t descsz, 734 size_t noff, size_t doff, int *flags, size_t size, int clazz) 735 { 736 #ifdef ELFCORE 737 char buf[256]; 738 const char *name = RCAST(const char *, &nbuf[noff]); 739 740 int os_style = -1; 741 /* 742 * Sigh. The 2.0.36 kernel in Debian 2.1, at 743 * least, doesn't correctly implement name 744 * sections, in core dumps, as specified by 745 * the "Program Linking" section of "UNIX(R) System 746 * V Release 4 Programmer's Guide: ANSI C and 747 * Programming Support Tools", because my copy 748 * clearly says "The first 'namesz' bytes in 'name' 749 * contain a *null-terminated* [emphasis mine] 750 * character representation of the entry's owner 751 * or originator", but the 2.0.36 kernel code 752 * doesn't include the terminating null in the 753 * name.... 754 */ 755 if ((namesz == 4 && strncmp(name, "CORE", 4) == 0) || 756 (namesz == 5 && strcmp(name, "CORE") == 0)) { 757 os_style = OS_STYLE_SVR4; 758 } 759 760 if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) { 761 os_style = OS_STYLE_FREEBSD; 762 } 763 764 if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11) 765 == 0)) { 766 os_style = OS_STYLE_NETBSD; 767 } 768 769 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 770 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 771 == -1) 772 return -1; 773 *flags |= FLAGS_DID_CORE_STYLE; 774 *flags |= os_style; 775 } 776 777 switch (os_style) { 778 case OS_STYLE_NETBSD: 779 if (type == NT_NETBSD_CORE_PROCINFO) { 780 char sbuf[512]; 781 struct NetBSD_elfcore_procinfo pi; 782 memset(&pi, 0, sizeof(pi)); 783 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi))); 784 785 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, " 786 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)", 787 file_printable(ms, sbuf, sizeof(sbuf), 788 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)), 789 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)), 790 elf_getu32(swap, pi.cpi_euid), 791 elf_getu32(swap, pi.cpi_egid), 792 elf_getu32(swap, pi.cpi_nlwps), 793 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)), 794 elf_getu32(swap, pi.cpi_signo), 795 elf_getu32(swap, pi.cpi_sigcode)) == -1) 796 return -1; 797 798 *flags |= FLAGS_DID_CORE; 799 return 1; 800 } 801 break; 802 803 case OS_STYLE_FREEBSD: 804 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 805 size_t argoff, pidoff; 806 807 if (clazz == ELFCLASS32) 808 argoff = 4 + 4 + 17; 809 else 810 argoff = 4 + 4 + 8 + 17; 811 if (file_printf(ms, ", from '%.80s'", nbuf + doff + 812 argoff) == -1) 813 return -1; 814 pidoff = argoff + 81 + 2; 815 if (doff + pidoff + 4 <= size) { 816 if (file_printf(ms, ", pid=%u", 817 elf_getu32(swap, *RCAST(uint32_t *, (nbuf + 818 doff + pidoff)))) == -1) 819 return -1; 820 } 821 *flags |= FLAGS_DID_CORE; 822 } 823 break; 824 825 default: 826 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 827 size_t i, j; 828 unsigned char c; 829 /* 830 * Extract the program name. We assume 831 * it to be 16 characters (that's what it 832 * is in SunOS 5.x and Linux). 833 * 834 * Unfortunately, it's at a different offset 835 * in various OSes, so try multiple offsets. 836 * If the characters aren't all printable, 837 * reject it. 838 */ 839 for (i = 0; i < NOFFSETS; i++) { 840 unsigned char *cname, *cp; 841 size_t reloffset = prpsoffsets(i); 842 size_t noffset = doff + reloffset; 843 size_t k; 844 for (j = 0; j < 16; j++, noffset++, 845 reloffset++) { 846 /* 847 * Make sure we're not past 848 * the end of the buffer; if 849 * we are, just give up. 850 */ 851 if (noffset >= size) 852 goto tryanother; 853 854 /* 855 * Make sure we're not past 856 * the end of the contents; 857 * if we are, this obviously 858 * isn't the right offset. 859 */ 860 if (reloffset >= descsz) 861 goto tryanother; 862 863 c = nbuf[noffset]; 864 if (c == '\0') { 865 /* 866 * A '\0' at the 867 * beginning is 868 * obviously wrong. 869 * Any other '\0' 870 * means we're done. 871 */ 872 if (j == 0) 873 goto tryanother; 874 else 875 break; 876 } else { 877 /* 878 * A nonprintable 879 * character is also 880 * wrong. 881 */ 882 if (!isprint(c) || isquote(c)) 883 goto tryanother; 884 } 885 } 886 /* 887 * Well, that worked. 888 */ 889 890 /* 891 * Try next offsets, in case this match is 892 * in the middle of a string. 893 */ 894 for (k = i + 1 ; k < NOFFSETS; k++) { 895 size_t no; 896 int adjust = 1; 897 if (prpsoffsets(k) >= prpsoffsets(i)) 898 continue; 899 for (no = doff + prpsoffsets(k); 900 no < doff + prpsoffsets(i); no++) 901 adjust = adjust 902 && isprint(nbuf[no]); 903 if (adjust) 904 i = k; 905 } 906 907 cname = CAST(unsigned char *, 908 &nbuf[doff + prpsoffsets(i)]); 909 for (cp = cname; cp < nbuf + size && *cp 910 && isprint(*cp); cp++) 911 continue; 912 /* 913 * Linux apparently appends a space at the end 914 * of the command line: remove it. 915 */ 916 while (cp > cname && isspace(cp[-1])) 917 cp--; 918 if (file_printf(ms, ", from '%s'", 919 file_copystr(buf, sizeof(buf), 920 CAST(size_t, cp - cname), 921 RCAST(char *, cname))) == -1) 922 return -1; 923 *flags |= FLAGS_DID_CORE; 924 return 1; 925 926 tryanother: 927 ; 928 } 929 } 930 break; 931 } 932 #endif 933 return 0; 934 } 935 936 private off_t 937 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, 938 off_t off, int num, off_t fsize, uint64_t virtaddr) 939 { 940 Elf32_Phdr ph32; 941 Elf64_Phdr ph64; 942 943 /* 944 * Loop through all the program headers and find the header with 945 * virtual address in which the "virtaddr" belongs to. 946 */ 947 for ( ; num; num--) { 948 if (pread(fd, xph_addr, xph_sizeof, off) < 949 CAST(ssize_t, xph_sizeof)) { 950 if (file_printf(ms, 951 ", can't read elf program header at %jd", 952 (intmax_t)off) == -1) 953 return -1; 954 return 0; 955 956 } 957 off += xph_sizeof; 958 959 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 960 /* Perhaps warn here */ 961 continue; 962 } 963 964 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) 965 return xph_offset + (virtaddr - xph_vaddr); 966 } 967 return 0; 968 } 969 970 private size_t 971 get_string_on_virtaddr(struct magic_set *ms, 972 int swap, int clazz, int fd, off_t ph_off, int ph_num, 973 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) 974 { 975 char *bptr; 976 off_t offset; 977 978 if (buflen == 0) 979 return 0; 980 981 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, 982 fsize, virtaddr); 983 if (offset < 0 || 984 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) { 985 (void)file_printf(ms, ", can't read elf string at %jd", 986 (intmax_t)offset); 987 return 0; 988 } 989 990 buf[buflen - 1] = '\0'; 991 992 /* We expect only printable characters, so return if buffer contains 993 * non-printable character before the '\0' or just '\0'. */ 994 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++) 995 continue; 996 if (*bptr != '\0') 997 return 0; 998 999 return bptr - buf; 1000 } 1001 1002 1003 /*ARGSUSED*/ 1004 private int 1005 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 1006 int swap, uint32_t namesz __attribute__((__unused__)), 1007 uint32_t descsz __attribute__((__unused__)), 1008 size_t noff __attribute__((__unused__)), size_t doff, 1009 int *flags, size_t size __attribute__((__unused__)), int clazz, 1010 int fd, off_t ph_off, int ph_num, off_t fsize) 1011 { 1012 #ifdef ELFCORE 1013 Aux32Info auxv32; 1014 Aux64Info auxv64; 1015 size_t elsize = xauxv_sizeof; 1016 const char *tag; 1017 int is_string; 1018 size_t nval; 1019 1020 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != 1021 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) 1022 return 0; 1023 1024 switch (*flags & FLAGS_CORE_STYLE) { 1025 case OS_STYLE_SVR4: 1026 if (type != NT_AUXV) 1027 return 0; 1028 break; 1029 #ifdef notyet 1030 case OS_STYLE_NETBSD: 1031 if (type != NT_NETBSD_CORE_AUXV) 1032 return 0; 1033 break; 1034 case OS_STYLE_FREEBSD: 1035 if (type != NT_FREEBSD_PROCSTAT_AUXV) 1036 return 0; 1037 break; 1038 #endif 1039 default: 1040 return 0; 1041 } 1042 1043 *flags |= FLAGS_DID_AUXV; 1044 1045 nval = 0; 1046 for (size_t off = 0; off + elsize <= descsz; off += elsize) { 1047 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 1048 /* Limit processing to 50 vector entries to prevent DoS */ 1049 if (nval++ >= 50) { 1050 file_error(ms, 0, "Too many ELF Auxv elements"); 1051 return 1; 1052 } 1053 1054 switch(xauxv_type) { 1055 case AT_LINUX_EXECFN: 1056 is_string = 1; 1057 tag = "execfn"; 1058 break; 1059 case AT_LINUX_PLATFORM: 1060 is_string = 1; 1061 tag = "platform"; 1062 break; 1063 case AT_LINUX_UID: 1064 is_string = 0; 1065 tag = "real uid"; 1066 break; 1067 case AT_LINUX_GID: 1068 is_string = 0; 1069 tag = "real gid"; 1070 break; 1071 case AT_LINUX_EUID: 1072 is_string = 0; 1073 tag = "effective uid"; 1074 break; 1075 case AT_LINUX_EGID: 1076 is_string = 0; 1077 tag = "effective gid"; 1078 break; 1079 default: 1080 is_string = 0; 1081 tag = NULL; 1082 break; 1083 } 1084 1085 if (tag == NULL) 1086 continue; 1087 1088 if (is_string) { 1089 char buf[256]; 1090 ssize_t buflen; 1091 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 1092 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 1093 1094 if (buflen == 0) 1095 continue; 1096 1097 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 1098 return -1; 1099 } else { 1100 if (file_printf(ms, ", %s: %d", tag, 1101 CAST(int, xauxv_val)) == -1) 1102 return -1; 1103 } 1104 } 1105 return 1; 1106 #else 1107 return 0; 1108 #endif 1109 } 1110 1111 private size_t 1112 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1113 int clazz, int swap, int *pie, size_t *need) 1114 { 1115 Elf32_Dyn dh32; 1116 Elf64_Dyn dh64; 1117 unsigned char *dbuf = CAST(unsigned char *, vbuf); 1118 1119 if (xdh_sizeof + offset > size) { 1120 /* 1121 * We're out of note headers. 1122 */ 1123 return xdh_sizeof + offset; 1124 } 1125 1126 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof); 1127 offset += xdh_sizeof; 1128 1129 switch (xdh_tag) { 1130 case DT_FLAGS_1: 1131 *pie = 1; 1132 if (xdh_val & DF_1_PIE) 1133 ms->mode |= 0111; 1134 else 1135 ms->mode &= ~0111; 1136 break; 1137 case DT_NEEDED: 1138 (*need)++; 1139 break; 1140 default: 1141 break; 1142 } 1143 return offset; 1144 } 1145 1146 1147 private size_t 1148 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1149 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1150 int fd, off_t ph_off, int ph_num, off_t fsize) 1151 { 1152 Elf32_Nhdr nh32; 1153 Elf64_Nhdr nh64; 1154 size_t noff, doff; 1155 uint32_t namesz, descsz; 1156 char buf[256]; 1157 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1158 1159 if (*notecount == 0) 1160 return 0; 1161 --*notecount; 1162 1163 if (xnh_sizeof + offset > size) { 1164 /* 1165 * We're out of note headers. 1166 */ 1167 return xnh_sizeof + offset; 1168 } 1169 /*XXX: GCC */ 1170 memset(&nh32, 0, sizeof(nh32)); 1171 memset(&nh64, 0, sizeof(nh64)); 1172 1173 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1174 offset += xnh_sizeof; 1175 1176 namesz = xnh_namesz; 1177 descsz = xnh_descsz; 1178 1179 if ((namesz == 0) && (descsz == 0)) { 1180 /* 1181 * We're out of note headers. 1182 */ 1183 return (offset >= size) ? offset : size; 1184 } 1185 1186 if (namesz & 0x80000000) { 1187 (void)file_printf(ms, ", bad note name size %#lx", 1188 CAST(unsigned long, namesz)); 1189 return 0; 1190 } 1191 1192 if (descsz & 0x80000000) { 1193 (void)file_printf(ms, ", bad note description size %#lx", 1194 CAST(unsigned long, descsz)); 1195 return 0; 1196 } 1197 1198 noff = offset; 1199 doff = ELF_ALIGN(offset + namesz); 1200 1201 if (offset + namesz > size) { 1202 /* 1203 * We're past the end of the buffer. 1204 */ 1205 return doff; 1206 } 1207 1208 offset = ELF_ALIGN(doff + descsz); 1209 if (doff + descsz > size) { 1210 /* 1211 * We're past the end of the buffer. 1212 */ 1213 return (offset >= size) ? offset : size; 1214 } 1215 1216 1217 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1218 if (do_os_note(ms, nbuf, xnh_type, swap, 1219 namesz, descsz, noff, doff, flags)) 1220 return offset; 1221 } 1222 1223 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1224 if (do_bid_note(ms, nbuf, xnh_type, swap, 1225 namesz, descsz, noff, doff, flags)) 1226 return offset; 1227 } 1228 1229 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1230 if (do_pax_note(ms, nbuf, xnh_type, swap, 1231 namesz, descsz, noff, doff, flags)) 1232 return offset; 1233 } 1234 1235 if ((*flags & FLAGS_DID_CORE) == 0) { 1236 if (do_core_note(ms, nbuf, xnh_type, swap, 1237 namesz, descsz, noff, doff, flags, size, clazz)) 1238 return offset; 1239 } 1240 1241 if ((*flags & FLAGS_DID_AUXV) == 0) { 1242 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1243 namesz, descsz, noff, doff, flags, size, clazz, 1244 fd, ph_off, ph_num, fsize)) 1245 return offset; 1246 } 1247 1248 if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) { 1249 int descw, flag; 1250 const char *str, *tag; 1251 if (descsz > 100) 1252 descsz = 100; 1253 switch (xnh_type) { 1254 case NT_NETBSD_VERSION: 1255 return offset; 1256 case NT_NETBSD_MARCH: 1257 flag = FLAGS_DID_NETBSD_MARCH; 1258 tag = "compiled for"; 1259 break; 1260 case NT_NETBSD_CMODEL: 1261 flag = FLAGS_DID_NETBSD_CMODEL; 1262 tag = "compiler model"; 1263 break; 1264 case NT_NETBSD_EMULATION: 1265 flag = FLAGS_DID_NETBSD_EMULATION; 1266 tag = "emulation:"; 1267 break; 1268 default: 1269 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1270 return offset; 1271 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1272 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1273 return offset; 1274 return offset; 1275 } 1276 1277 if (*flags & flag) 1278 return offset; 1279 str = RCAST(const char *, &nbuf[doff]); 1280 descw = CAST(int, descsz); 1281 *flags |= flag; 1282 file_printf(ms, ", %s: %s", tag, 1283 file_copystr(buf, sizeof(buf), descw, str)); 1284 return offset; 1285 } 1286 1287 return offset; 1288 } 1289 1290 /* SunOS 5.x hardware capability descriptions */ 1291 typedef struct cap_desc { 1292 uint64_t cd_mask; 1293 const char *cd_name; 1294 } cap_desc_t; 1295 1296 static const cap_desc_t cap_desc_sparc[] = { 1297 { AV_SPARC_MUL32, "MUL32" }, 1298 { AV_SPARC_DIV32, "DIV32" }, 1299 { AV_SPARC_FSMULD, "FSMULD" }, 1300 { AV_SPARC_V8PLUS, "V8PLUS" }, 1301 { AV_SPARC_POPC, "POPC" }, 1302 { AV_SPARC_VIS, "VIS" }, 1303 { AV_SPARC_VIS2, "VIS2" }, 1304 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1305 { AV_SPARC_FMAF, "FMAF" }, 1306 { AV_SPARC_FJFMAU, "FJFMAU" }, 1307 { AV_SPARC_IMA, "IMA" }, 1308 { 0, NULL } 1309 }; 1310 1311 static const cap_desc_t cap_desc_386[] = { 1312 { AV_386_FPU, "FPU" }, 1313 { AV_386_TSC, "TSC" }, 1314 { AV_386_CX8, "CX8" }, 1315 { AV_386_SEP, "SEP" }, 1316 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1317 { AV_386_CMOV, "CMOV" }, 1318 { AV_386_MMX, "MMX" }, 1319 { AV_386_AMD_MMX, "AMD_MMX" }, 1320 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1321 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1322 { AV_386_FXSR, "FXSR" }, 1323 { AV_386_SSE, "SSE" }, 1324 { AV_386_SSE2, "SSE2" }, 1325 { AV_386_PAUSE, "PAUSE" }, 1326 { AV_386_SSE3, "SSE3" }, 1327 { AV_386_MON, "MON" }, 1328 { AV_386_CX16, "CX16" }, 1329 { AV_386_AHF, "AHF" }, 1330 { AV_386_TSCP, "TSCP" }, 1331 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1332 { AV_386_POPCNT, "POPCNT" }, 1333 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1334 { AV_386_SSSE3, "SSSE3" }, 1335 { AV_386_SSE4_1, "SSE4.1" }, 1336 { AV_386_SSE4_2, "SSE4.2" }, 1337 { 0, NULL } 1338 }; 1339 1340 private int 1341 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1342 size_t size, off_t fsize, int mach, int strtab, int *flags, 1343 uint16_t *notecount) 1344 { 1345 Elf32_Shdr sh32; 1346 Elf64_Shdr sh64; 1347 int stripped = 1, has_debug_info = 0; 1348 size_t nbadcap = 0; 1349 void *nbuf; 1350 off_t noff, coff, name_off, offs; 1351 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ 1352 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ 1353 char name[50]; 1354 ssize_t namesize; 1355 1356 if (ms->flags & MAGIC_MIME) 1357 return 0; 1358 1359 if (num == 0) { 1360 if (file_printf(ms, ", no section header") == -1) 1361 return -1; 1362 return 0; 1363 } 1364 if (size != xsh_sizeof) { 1365 if (file_printf(ms, ", corrupted section header size") == -1) 1366 return -1; 1367 return 0; 1368 } 1369 1370 /* Read offset of name section to be able to read section names later */ 1371 offs = CAST(off_t, (off + size * strtab)); 1372 if (pread(fd, xsh_addr, xsh_sizeof, offs) < CAST(ssize_t, xsh_sizeof)) { 1373 if (file_printf(ms, ", missing section headers at %jd", 1374 (intmax_t)offs) == -1) 1375 return -1; 1376 return 0; 1377 } 1378 name_off = xsh_offset; 1379 1380 if (fsize != SIZE_UNKNOWN && fsize < name_off) { 1381 if (file_printf(ms, ", too large section header offset %jd", 1382 (intmax_t)name_off) == -1) 1383 return -1; 1384 return 0; 1385 } 1386 1387 for ( ; num; num--) { 1388 /* Read the name of this section. */ 1389 offs = name_off + xsh_name; 1390 if ((namesize = pread(fd, name, sizeof(name) - 1, offs)) 1391 == -1) { 1392 if (file_printf(ms, 1393 ", can't read name of elf section at %jd", 1394 (intmax_t)offs) == -1) 1395 return -1; 1396 return 0; 1397 } 1398 name[namesize] = '\0'; 1399 if (strcmp(name, ".debug_info") == 0) { 1400 has_debug_info = 1; 1401 stripped = 0; 1402 } 1403 1404 if (pread(fd, xsh_addr, xsh_sizeof, off) < 1405 CAST(ssize_t, xsh_sizeof)) { 1406 if (file_printf(ms, ", can't read elf section at %jd", 1407 (intmax_t)off) == -1) 1408 return -1; 1409 return 0; 1410 } 1411 off += size; 1412 1413 /* Things we can determine before we seek */ 1414 switch (xsh_type) { 1415 case SHT_SYMTAB: 1416 #if 0 1417 case SHT_DYNSYM: 1418 #endif 1419 stripped = 0; 1420 break; 1421 default: 1422 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1423 /* Perhaps warn here */ 1424 continue; 1425 } 1426 break; 1427 } 1428 1429 1430 /* Things we can determine when we seek */ 1431 switch (xsh_type) { 1432 case SHT_NOTE: 1433 if (CAST(uintmax_t, (xsh_size + xsh_offset)) > 1434 CAST(uintmax_t, fsize)) { 1435 if (file_printf(ms, 1436 ", note offset/size %#" INTMAX_T_FORMAT 1437 "x+%#" INTMAX_T_FORMAT "x exceeds" 1438 " file size %#" INTMAX_T_FORMAT "x", 1439 CAST(uintmax_t, xsh_offset), 1440 CAST(uintmax_t, xsh_size), 1441 CAST(uintmax_t, fsize)) == -1) 1442 return -1; 1443 return 0; 1444 } 1445 if ((nbuf = malloc(xsh_size)) == NULL) { 1446 file_error(ms, errno, "Cannot allocate memory" 1447 " for note"); 1448 return -1; 1449 } 1450 offs = xsh_offset; 1451 if (pread(fd, nbuf, xsh_size, offs) < 1452 CAST(ssize_t, xsh_size)) { 1453 free(nbuf); 1454 if (file_printf(ms, 1455 ", can't read elf note at %jd", 1456 (intmax_t)offs) == -1) 1457 return -1; 1458 return 0; 1459 } 1460 1461 noff = 0; 1462 for (;;) { 1463 if (noff >= CAST(off_t, xsh_size)) 1464 break; 1465 noff = donote(ms, nbuf, CAST(size_t, noff), 1466 xsh_size, clazz, swap, 4, flags, notecount, 1467 fd, 0, 0, 0); 1468 if (noff == 0) 1469 break; 1470 } 1471 free(nbuf); 1472 break; 1473 case SHT_SUNW_cap: 1474 switch (mach) { 1475 case EM_SPARC: 1476 case EM_SPARCV9: 1477 case EM_IA_64: 1478 case EM_386: 1479 case EM_AMD64: 1480 break; 1481 default: 1482 goto skip; 1483 } 1484 1485 if (nbadcap > 5) 1486 break; 1487 if (lseek(fd, xsh_offset, SEEK_SET) 1488 == CAST(off_t, -1)) { 1489 file_badseek(ms); 1490 return -1; 1491 } 1492 coff = 0; 1493 for (;;) { 1494 Elf32_Cap cap32; 1495 Elf64_Cap cap64; 1496 char cbuf[/*CONSTCOND*/ 1497 MAX(sizeof(cap32), sizeof(cap64))]; 1498 if ((coff += xcap_sizeof) > 1499 CAST(off_t, xsh_size)) 1500 break; 1501 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) != 1502 CAST(ssize_t, xcap_sizeof)) { 1503 file_badread(ms); 1504 return -1; 1505 } 1506 if (cbuf[0] == 'A') { 1507 #ifdef notyet 1508 char *p = cbuf + 1; 1509 uint32_t len, tag; 1510 memcpy(&len, p, sizeof(len)); 1511 p += 4; 1512 len = getu32(swap, len); 1513 if (memcmp("gnu", p, 3) != 0) { 1514 if (file_printf(ms, 1515 ", unknown capability %.3s", p) 1516 == -1) 1517 return -1; 1518 break; 1519 } 1520 p += strlen(p) + 1; 1521 tag = *p++; 1522 memcpy(&len, p, sizeof(len)); 1523 p += 4; 1524 len = getu32(swap, len); 1525 if (tag != 1) { 1526 if (file_printf(ms, ", unknown gnu" 1527 " capability tag %d", tag) 1528 == -1) 1529 return -1; 1530 break; 1531 } 1532 // gnu attributes 1533 #endif 1534 break; 1535 } 1536 memcpy(xcap_addr, cbuf, xcap_sizeof); 1537 switch (xcap_tag) { 1538 case CA_SUNW_NULL: 1539 break; 1540 case CA_SUNW_HW_1: 1541 cap_hw1 |= xcap_val; 1542 break; 1543 case CA_SUNW_SF_1: 1544 cap_sf1 |= xcap_val; 1545 break; 1546 default: 1547 if (file_printf(ms, 1548 ", with unknown capability " 1549 "%#" INT64_T_FORMAT "x = %#" 1550 INT64_T_FORMAT "x", 1551 CAST(unsigned long long, xcap_tag), 1552 CAST(unsigned long long, xcap_val)) 1553 == -1) 1554 return -1; 1555 if (nbadcap++ > 2) 1556 coff = xsh_size; 1557 break; 1558 } 1559 } 1560 /*FALLTHROUGH*/ 1561 skip: 1562 default: 1563 break; 1564 } 1565 } 1566 1567 if (has_debug_info) { 1568 if (file_printf(ms, ", with debug_info") == -1) 1569 return -1; 1570 } 1571 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1572 return -1; 1573 if (cap_hw1) { 1574 const cap_desc_t *cdp; 1575 switch (mach) { 1576 case EM_SPARC: 1577 case EM_SPARC32PLUS: 1578 case EM_SPARCV9: 1579 cdp = cap_desc_sparc; 1580 break; 1581 case EM_386: 1582 case EM_IA_64: 1583 case EM_AMD64: 1584 cdp = cap_desc_386; 1585 break; 1586 default: 1587 cdp = NULL; 1588 break; 1589 } 1590 if (file_printf(ms, ", uses") == -1) 1591 return -1; 1592 if (cdp) { 1593 while (cdp->cd_name) { 1594 if (cap_hw1 & cdp->cd_mask) { 1595 if (file_printf(ms, 1596 " %s", cdp->cd_name) == -1) 1597 return -1; 1598 cap_hw1 &= ~cdp->cd_mask; 1599 } 1600 ++cdp; 1601 } 1602 if (cap_hw1) 1603 if (file_printf(ms, 1604 " unknown hardware capability %#" 1605 INT64_T_FORMAT "x", 1606 CAST(unsigned long long, cap_hw1)) == -1) 1607 return -1; 1608 } else { 1609 if (file_printf(ms, 1610 " hardware capability %#" INT64_T_FORMAT "x", 1611 CAST(unsigned long long, cap_hw1)) == -1) 1612 return -1; 1613 } 1614 } 1615 if (cap_sf1) { 1616 if (cap_sf1 & SF1_SUNW_FPUSED) { 1617 if (file_printf(ms, 1618 (cap_sf1 & SF1_SUNW_FPKNWN) 1619 ? ", uses frame pointer" 1620 : ", not known to use frame pointer") == -1) 1621 return -1; 1622 } 1623 cap_sf1 &= ~SF1_SUNW_MASK; 1624 if (cap_sf1) 1625 if (file_printf(ms, 1626 ", with unknown software capability %#" 1627 INT64_T_FORMAT "x", 1628 CAST(unsigned long long, cap_sf1)) == -1) 1629 return -1; 1630 } 1631 return 0; 1632 } 1633 1634 /* 1635 * Look through the program headers of an executable image, to determine 1636 * if it is statically or dynamically linked. If it has a dynamic section, 1637 * it is pie, and does not have an interpreter or needed libraries, we 1638 * call it static pie. 1639 */ 1640 private int 1641 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1642 int num, size_t size, off_t fsize, int sh_num, int *flags, 1643 uint16_t *notecount) 1644 { 1645 Elf32_Phdr ph32; 1646 Elf64_Phdr ph64; 1647 const char *linking_style; 1648 unsigned char nbuf[BUFSIZ]; 1649 char ibuf[BUFSIZ]; 1650 char interp[BUFSIZ]; 1651 ssize_t bufsize; 1652 size_t offset, align, len, need = 0; 1653 int pie = 0, dynamic = 0; 1654 1655 if (num == 0) { 1656 if (file_printf(ms, ", no program header") == -1) 1657 return -1; 1658 return 0; 1659 } 1660 if (size != xph_sizeof) { 1661 if (file_printf(ms, ", corrupted program header size") == -1) 1662 return -1; 1663 return 0; 1664 } 1665 1666 interp[0] = '\0'; 1667 for ( ; num; num--) { 1668 int doread; 1669 if (pread(fd, xph_addr, xph_sizeof, off) < 1670 CAST(ssize_t, xph_sizeof)) { 1671 if (file_printf(ms, 1672 ", can't read elf program headers at %jd", 1673 (intmax_t)off) == -1) 1674 return -1; 1675 return 0; 1676 } 1677 1678 off += size; 1679 bufsize = 0; 1680 align = 4; 1681 1682 /* Things we can determine before we seek */ 1683 switch (xph_type) { 1684 case PT_DYNAMIC: 1685 doread = 1; 1686 break; 1687 case PT_NOTE: 1688 if (sh_num) /* Did this through section headers */ 1689 continue; 1690 if (((align = xph_align) & 0x80000000UL) != 0 || 1691 align < 4) { 1692 if (file_printf(ms, 1693 ", invalid note alignment %#lx", 1694 CAST(unsigned long, align)) == -1) 1695 return -1; 1696 align = 4; 1697 } 1698 /*FALLTHROUGH*/ 1699 case PT_INTERP: 1700 doread = 1; 1701 break; 1702 default: 1703 doread = 0; 1704 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1705 /* Maybe warn here? */ 1706 continue; 1707 } 1708 break; 1709 } 1710 1711 if (doread) { 1712 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1713 : sizeof(nbuf); 1714 off_t offs = xph_offset; 1715 bufsize = pread(fd, nbuf, len, offs); 1716 if (bufsize == -1) { 1717 if (file_printf(ms, 1718 ", can't read section at %jd", 1719 (intmax_t)offs) == -1) 1720 return -1; 1721 return 0; 1722 } 1723 } else 1724 len = 0; 1725 1726 /* Things we can determine when we seek */ 1727 switch (xph_type) { 1728 case PT_DYNAMIC: 1729 dynamic = 1; 1730 offset = 0; 1731 // Let DF_1 determine if we are PIE or not. 1732 ms->mode &= ~0111; 1733 for (;;) { 1734 if (offset >= CAST(size_t, bufsize)) 1735 break; 1736 offset = dodynamic(ms, nbuf, offset, 1737 CAST(size_t, bufsize), clazz, swap, 1738 &pie, &need); 1739 if (offset == 0) 1740 break; 1741 } 1742 if (ms->flags & MAGIC_MIME) 1743 continue; 1744 break; 1745 1746 case PT_INTERP: 1747 need++; 1748 if (ms->flags & MAGIC_MIME) 1749 continue; 1750 if (bufsize && nbuf[0]) { 1751 nbuf[bufsize - 1] = '\0'; 1752 memcpy(interp, nbuf, CAST(size_t, bufsize)); 1753 } else 1754 strlcpy(interp, "*empty*", sizeof(interp)); 1755 break; 1756 case PT_NOTE: 1757 if (ms->flags & MAGIC_MIME) 1758 return 0; 1759 /* 1760 * This is a PT_NOTE section; loop through all the notes 1761 * in the section. 1762 */ 1763 offset = 0; 1764 for (;;) { 1765 if (offset >= CAST(size_t, bufsize)) 1766 break; 1767 offset = donote(ms, nbuf, offset, 1768 CAST(size_t, bufsize), clazz, swap, align, 1769 flags, notecount, fd, 0, 0, 0); 1770 if (offset == 0) 1771 break; 1772 } 1773 break; 1774 default: 1775 if (ms->flags & MAGIC_MIME) 1776 continue; 1777 break; 1778 } 1779 } 1780 if (ms->flags & MAGIC_MIME) 1781 return 0; 1782 if (dynamic) { 1783 if (pie && need == 0) 1784 linking_style = "static-pie"; 1785 else 1786 linking_style = "dynamically"; 1787 } else { 1788 linking_style = "statically"; 1789 } 1790 if (file_printf(ms, ", %s linked", linking_style) == -1) 1791 return -1; 1792 if (interp[0]) 1793 if (file_printf(ms, ", interpreter %s", file_printable(ms, 1794 ibuf, sizeof(ibuf), interp, sizeof(interp))) == -1) 1795 return -1; 1796 return 0; 1797 } 1798 1799 1800 protected int 1801 file_tryelf(struct magic_set *ms, const struct buffer *b) 1802 { 1803 int fd = b->fd; 1804 const unsigned char *buf = CAST(const unsigned char *, b->fbuf); 1805 size_t nbytes = b->flen; 1806 union { 1807 int32_t l; 1808 char c[sizeof(int32_t)]; 1809 } u; 1810 int clazz; 1811 int swap; 1812 struct stat st; 1813 const struct stat *stp; 1814 off_t fsize; 1815 int flags = 0; 1816 Elf32_Ehdr elf32hdr; 1817 Elf64_Ehdr elf64hdr; 1818 uint16_t type, phnum, shnum, notecount; 1819 1820 if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION)) 1821 return 0; 1822 /* 1823 * ELF executables have multiple section headers in arbitrary 1824 * file locations and thus file(1) cannot determine it from easily. 1825 * Instead we traverse thru all section headers until a symbol table 1826 * one is found or else the binary is stripped. 1827 * Return immediately if it's not ELF (so we avoid pipe2file unless 1828 * needed). 1829 */ 1830 if (buf[EI_MAG0] != ELFMAG0 1831 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1832 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1833 return 0; 1834 1835 /* 1836 * If we cannot seek, it must be a pipe, socket or fifo. 1837 */ 1838 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) 1839 && (errno == ESPIPE)) 1840 fd = file_pipe2file(ms, fd, buf, nbytes); 1841 1842 if (fd == -1) { 1843 file_badread(ms); 1844 return -1; 1845 } 1846 1847 stp = &b->st; 1848 /* 1849 * b->st.st_size != 0 if previous fstat() succeeded, 1850 * which is likely, we can avoid extra stat() call. 1851 */ 1852 if (b->st.st_size == 0) { 1853 stp = &st; 1854 if (fstat(fd, &st) == -1) { 1855 file_badread(ms); 1856 return -1; 1857 } 1858 } 1859 if (S_ISREG(stp->st_mode) || stp->st_size != 0) 1860 fsize = stp->st_size; 1861 else 1862 fsize = SIZE_UNKNOWN; 1863 1864 clazz = buf[EI_CLASS]; 1865 1866 switch (clazz) { 1867 case ELFCLASS32: 1868 #undef elf_getu 1869 #define elf_getu(a, b) elf_getu32(a, b) 1870 #undef elfhdr 1871 #define elfhdr elf32hdr 1872 #include "elfclass.h" 1873 case ELFCLASS64: 1874 #undef elf_getu 1875 #define elf_getu(a, b) elf_getu64(a, b) 1876 #undef elfhdr 1877 #define elfhdr elf64hdr 1878 #include "elfclass.h" 1879 default: 1880 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1881 return -1; 1882 break; 1883 } 1884 return 0; 1885 } 1886 #endif 1887