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 1.196 2024/11/11 15:49:11 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 file_private int dophn_core(struct magic_set *, int, int, int, off_t, int, 46 size_t, off_t, int *, uint16_t *); 47 #endif 48 file_private int dophn_exec(struct magic_set *, int, int, int, off_t, int, 49 size_t, off_t, int, int *, uint16_t *); 50 file_private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, 51 off_t, int, int, int *, uint16_t *); 52 file_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 file_private uint16_t getu16(int, uint16_t); 60 file_private uint32_t getu32(int, uint32_t); 61 file_private uint64_t getu64(int, uint64_t); 62 63 #define NBUFSIZE 2024 64 #define SIZE_UNKNOWN CAST(off_t, -1) 65 #define NAMEEQUALS(n, v) \ 66 (namesz == sizeof(v) && memcmp(n, v, namesz) == 0) 67 68 file_private int 69 toomany(struct magic_set *ms, const char *name, uint16_t num) 70 { 71 if (ms->flags & MAGIC_MIME) 72 return 1; 73 if (file_printf(ms, ", too many %s (%u)", name, num) == -1) 74 return -1; 75 return 1; 76 } 77 78 file_private uint16_t 79 getu16(int swap, uint16_t value) 80 { 81 union { 82 uint16_t ui; 83 char c[2]; 84 } retval, tmpval; 85 86 if (swap) { 87 tmpval.ui = value; 88 89 retval.c[0] = tmpval.c[1]; 90 retval.c[1] = tmpval.c[0]; 91 92 return retval.ui; 93 } else 94 return value; 95 } 96 97 file_private uint32_t 98 getu32(int swap, uint32_t value) 99 { 100 union { 101 uint32_t ui; 102 char c[4]; 103 } retval, tmpval; 104 105 if (swap) { 106 tmpval.ui = value; 107 108 retval.c[0] = tmpval.c[3]; 109 retval.c[1] = tmpval.c[2]; 110 retval.c[2] = tmpval.c[1]; 111 retval.c[3] = tmpval.c[0]; 112 113 return retval.ui; 114 } else 115 return value; 116 } 117 118 file_private uint64_t 119 getu64(int swap, uint64_t value) 120 { 121 union { 122 uint64_t ui; 123 char c[8]; 124 } retval, tmpval; 125 126 if (swap) { 127 tmpval.ui = value; 128 129 retval.c[0] = tmpval.c[7]; 130 retval.c[1] = tmpval.c[6]; 131 retval.c[2] = tmpval.c[5]; 132 retval.c[3] = tmpval.c[4]; 133 retval.c[4] = tmpval.c[3]; 134 retval.c[5] = tmpval.c[2]; 135 retval.c[6] = tmpval.c[1]; 136 retval.c[7] = tmpval.c[0]; 137 138 return retval.ui; 139 } else 140 return value; 141 } 142 143 #define elf_getu16(swap, value) getu16(swap, value) 144 #define elf_getu32(swap, value) getu32(swap, value) 145 #define elf_getu64(swap, value) getu64(swap, value) 146 147 #define xsh_addr (clazz == ELFCLASS32 \ 148 ? CAST(void *, &sh32) \ 149 : CAST(void *, &sh64)) 150 #define xsh_sizeof (clazz == ELFCLASS32 \ 151 ? sizeof(sh32) \ 152 : sizeof(sh64)) 153 #define xsh_size CAST(size_t, (clazz == ELFCLASS32 \ 154 ? elf_getu32(swap, sh32.sh_size) \ 155 : elf_getu64(swap, sh64.sh_size))) 156 #define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \ 157 ? elf_getu32(swap, sh32.sh_offset) \ 158 : elf_getu64(swap, sh64.sh_offset))) 159 #define xsh_type (clazz == ELFCLASS32 \ 160 ? elf_getu32(swap, sh32.sh_type) \ 161 : elf_getu32(swap, sh64.sh_type)) 162 #define xsh_name (clazz == ELFCLASS32 \ 163 ? elf_getu32(swap, sh32.sh_name) \ 164 : elf_getu32(swap, sh64.sh_name)) 165 166 #define xph_addr (clazz == ELFCLASS32 \ 167 ? CAST(void *, &ph32) \ 168 : CAST(void *, &ph64)) 169 #define xph_sizeof (clazz == ELFCLASS32 \ 170 ? sizeof(ph32) \ 171 : sizeof(ph64)) 172 #define xph_type (clazz == ELFCLASS32 \ 173 ? elf_getu32(swap, ph32.p_type) \ 174 : elf_getu32(swap, ph64.p_type)) 175 #define xph_offset CAST(off_t, (clazz == ELFCLASS32 \ 176 ? elf_getu32(swap, ph32.p_offset) \ 177 : elf_getu64(swap, ph64.p_offset))) 178 #define xph_align CAST(size_t, (clazz == ELFCLASS32 \ 179 ? CAST(off_t, (ph32.p_align ? \ 180 elf_getu32(swap, ph32.p_align) : 4))\ 181 : CAST(off_t, (ph64.p_align ? \ 182 elf_getu64(swap, ph64.p_align) : 4)))) 183 #define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \ 184 ? CAST(off_t, (ph32.p_vaddr ? \ 185 elf_getu32(swap, ph32.p_vaddr) : 4))\ 186 : CAST(off_t, (ph64.p_vaddr ? \ 187 elf_getu64(swap, ph64.p_vaddr) : 4)))) 188 #define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \ 189 ? elf_getu32(swap, ph32.p_filesz) \ 190 : elf_getu64(swap, ph64.p_filesz))) 191 #define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \ 192 ? elf_getu32(swap, ph32.p_memsz) \ 193 : elf_getu64(swap, ph64.p_memsz)))) 194 #define xnh_addr (clazz == ELFCLASS32 \ 195 ? CAST(void *, &nh32) \ 196 : CAST(void *, &nh64)) 197 #define xnh_sizeof (clazz == ELFCLASS32 \ 198 ? sizeof(nh32) \ 199 : sizeof(nh64)) 200 #define xnh_type (clazz == ELFCLASS32 \ 201 ? elf_getu32(swap, nh32.n_type) \ 202 : elf_getu32(swap, nh64.n_type)) 203 #define xnh_namesz (clazz == ELFCLASS32 \ 204 ? elf_getu32(swap, nh32.n_namesz) \ 205 : elf_getu32(swap, nh64.n_namesz)) 206 #define xnh_descsz (clazz == ELFCLASS32 \ 207 ? elf_getu32(swap, nh32.n_descsz) \ 208 : elf_getu32(swap, nh64.n_descsz)) 209 210 #define xdh_addr (clazz == ELFCLASS32 \ 211 ? CAST(void *, &dh32) \ 212 : CAST(void *, &dh64)) 213 #define xdh_sizeof (clazz == ELFCLASS32 \ 214 ? sizeof(dh32) \ 215 : sizeof(dh64)) 216 #define xdh_tag (clazz == ELFCLASS32 \ 217 ? elf_getu32(swap, dh32.d_tag) \ 218 : elf_getu64(swap, dh64.d_tag)) 219 #define xdh_val (clazz == ELFCLASS32 \ 220 ? elf_getu32(swap, dh32.d_un.d_val) \ 221 : elf_getu64(swap, dh64.d_un.d_val)) 222 223 #define xcap_addr (clazz == ELFCLASS32 \ 224 ? CAST(void *, &cap32) \ 225 : CAST(void *, &cap64)) 226 #define xcap_sizeof (clazz == ELFCLASS32 \ 227 ? sizeof(cap32) \ 228 : sizeof(cap64)) 229 #define xcap_tag (clazz == ELFCLASS32 \ 230 ? elf_getu32(swap, cap32.c_tag) \ 231 : elf_getu64(swap, cap64.c_tag)) 232 #define xcap_val (clazz == ELFCLASS32 \ 233 ? elf_getu32(swap, cap32.c_un.c_val) \ 234 : elf_getu64(swap, cap64.c_un.c_val)) 235 236 #define xauxv_addr (clazz == ELFCLASS32 \ 237 ? CAST(void *, &auxv32) \ 238 : CAST(void *, &auxv64)) 239 #define xauxv_sizeof (clazz == ELFCLASS32 \ 240 ? sizeof(auxv32) \ 241 : sizeof(auxv64)) 242 #define xauxv_type (clazz == ELFCLASS32 \ 243 ? elf_getu32(swap, auxv32.a_type) \ 244 : elf_getu64(swap, auxv64.a_type)) 245 #define xauxv_val (clazz == ELFCLASS32 \ 246 ? elf_getu32(swap, auxv32.a_v) \ 247 : elf_getu64(swap, auxv64.a_v)) 248 249 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 250 ? prpsoffsets32[i] \ 251 : prpsoffsets64[i]) 252 253 #ifdef ELFCORE 254 /* 255 * Try larger offsets first to avoid false matches 256 * from earlier data that happen to look like strings. 257 */ 258 static const size_t prpsoffsets32[] = { 259 #ifdef USE_NT_PSINFO 260 104, /* SunOS 5.x (command line) */ 261 88, /* SunOS 5.x (short name) */ 262 #endif /* USE_NT_PSINFO */ 263 264 100, /* SunOS 5.x (command line) */ 265 84, /* SunOS 5.x (short name) */ 266 267 44, /* Linux (command line) */ 268 28, /* Linux (short name) */ 269 270 48, /* Linux PowerPC (command line) */ 271 32, /* Linux PowerPC (short name) */ 272 273 8, /* FreeBSD */ 274 }; 275 276 static const size_t prpsoffsets64[] = { 277 #ifdef USE_NT_PSINFO 278 152, /* SunOS 5.x (command line) */ 279 136, /* SunOS 5.x (short name) */ 280 #endif /* USE_NT_PSINFO */ 281 282 136, /* SunOS 5.x, 64-bit (command line) */ 283 120, /* SunOS 5.x, 64-bit (short name) */ 284 285 56, /* Linux (command line) */ 286 40, /* Linux (tested on core from 2.4.x, short name) */ 287 288 16, /* FreeBSD, 64-bit */ 289 }; 290 291 #define NOFFSETS32 __arraycount(prpsoffsets32) 292 #define NOFFSETS64 __arraycount(prpsoffsets64) 293 294 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 295 296 /* 297 * Look through the program headers of an executable image, searching 298 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 299 * "FreeBSD"; if one is found, try looking in various places in its 300 * contents for a 16-character string containing only printable 301 * characters - if found, that string should be the name of the program 302 * that dropped core. Note: right after that 16-character string is, 303 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 304 * Linux, a longer string (80 characters, in 5.x, probably other 305 * SVR4-flavored systems, and Linux) containing the start of the 306 * command line for that program. 307 * 308 * SunOS 5.x core files contain two PT_NOTE sections, with the types 309 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 310 * same info about the command name and command line, so it probably 311 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 312 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 313 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 314 * the SunOS 5.x file command relies on this (and prefers the latter). 315 * 316 * The signal number probably appears in a section of type NT_PRSTATUS, 317 * but that's also rather OS-dependent, in ways that are harder to 318 * dissect with heuristics, so I'm not bothering with the signal number. 319 * (I suppose the signal number could be of interest in situations where 320 * you don't have the binary of the program that dropped core; if you 321 * *do* have that binary, the debugger will probably tell you what 322 * signal it was.) 323 */ 324 325 #define OS_STYLE_SVR4 0 326 #define OS_STYLE_FREEBSD 1 327 #define OS_STYLE_NETBSD 2 328 329 file_private const char os_style_names[][8] = { 330 "SVR4", 331 "FreeBSD", 332 "NetBSD", 333 }; 334 335 #define FLAGS_CORE_STYLE 0x0003 336 337 #define FLAGS_DID_CORE 0x0004 338 #define FLAGS_DID_OS_NOTE 0x0008 339 #define FLAGS_DID_BUILD_ID 0x0010 340 #define FLAGS_DID_CORE_STYLE 0x0020 341 #define FLAGS_DID_NETBSD_PAX 0x0040 342 #define FLAGS_DID_NETBSD_MARCH 0x0080 343 #define FLAGS_DID_NETBSD_CMODEL 0x0100 344 #define FLAGS_DID_NETBSD_EMULATION 0x0200 345 #define FLAGS_DID_NETBSD_UNKNOWN 0x0400 346 #define FLAGS_DID_ANDROID_MEMTAG 0x0800 347 #define FLAGS_IS_CORE 0x1000 348 #define FLAGS_DID_AUXV 0x2000 349 350 file_private int 351 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 352 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 353 { 354 Elf32_Phdr ph32; 355 Elf64_Phdr ph64; 356 size_t offset, len; 357 unsigned char nbuf[NBUFSIZE]; 358 ssize_t bufsize; 359 off_t ph_off = off, offs; 360 int ph_num = num; 361 362 if (ms->flags & MAGIC_MIME) 363 return 0; 364 365 if (num == 0) { 366 if (file_printf(ms, ", no program header") == -1) 367 return -1; 368 return 0; 369 } 370 if (size != xph_sizeof) { 371 if (file_printf(ms, ", corrupted program header size") == -1) 372 return -1; 373 return 0; 374 } 375 376 /* 377 * Loop through all the program headers. 378 */ 379 for ( ; num; num--) { 380 if (pread(fd, xph_addr, xph_sizeof, off) < 381 CAST(ssize_t, xph_sizeof)) { 382 if (file_printf(ms, 383 ", can't read elf program headers at %jd", 384 (intmax_t)off) == -1) 385 return -1; 386 return 0; 387 } 388 off += size; 389 390 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 391 /* Perhaps warn here */ 392 continue; 393 } 394 395 if (xph_type != PT_NOTE) 396 continue; 397 398 /* 399 * This is a PT_NOTE section; loop through all the notes 400 * in the section. 401 */ 402 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 403 offs = xph_offset; 404 if ((bufsize = pread(fd, nbuf, len, offs)) == -1) { 405 if (file_printf(ms, " can't read note section at %jd", 406 (intmax_t)offs) == -1) 407 return -1; 408 return 0; 409 } 410 offset = 0; 411 for (;;) { 412 if (offset >= CAST(size_t, bufsize)) 413 break; 414 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize), 415 clazz, swap, 4, flags, notecount, fd, ph_off, 416 ph_num, fsize); 417 if (offset == 0) 418 break; 419 420 } 421 } 422 return 0; 423 } 424 #endif 425 426 static int 427 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 428 { 429 uint32_t desc; 430 memcpy(&desc, v, sizeof(desc)); 431 desc = elf_getu32(swap, desc); 432 433 if (file_printf(ms, ", for NetBSD") == -1) 434 return -1; 435 /* 436 * The version number used to be stuck as 199905, and was thus 437 * basically content-free. Newer versions of NetBSD have fixed 438 * this and now use the encoding of __NetBSD_Version__: 439 * 440 * MMmmrrpp00 441 * 442 * M = major version 443 * m = minor version 444 * r = release ["",A-Z,Z[A-Z] but numeric] 445 * p = patchlevel 446 */ 447 if (desc > 100000000U) { 448 uint32_t ver_patch = (desc / 100) % 100; 449 uint32_t ver_rel = (desc / 10000) % 100; 450 uint32_t ver_min = (desc / 1000000) % 100; 451 uint32_t ver_maj = desc / 100000000; 452 453 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 454 return -1; 455 if (ver_maj >= 9) { 456 ver_patch += 100 * ver_rel; 457 ver_rel = 0; 458 } 459 if (ver_rel == 0 && ver_patch != 0) { 460 if (file_printf(ms, ".%u", ver_patch) == -1) 461 return -1; 462 } else if (ver_rel != 0) { 463 while (ver_rel > 26) { 464 if (file_printf(ms, "Z") == -1) 465 return -1; 466 ver_rel -= 26; 467 } 468 if (file_printf(ms, "%c", 'A' + ver_rel - 1) == -1) 469 return -1; 470 } 471 } 472 return 0; 473 } 474 475 static int 476 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 477 { 478 uint32_t desc; 479 480 memcpy(&desc, v, sizeof(desc)); 481 desc = elf_getu32(swap, desc); 482 if (file_printf(ms, ", for FreeBSD") == -1) 483 return -1; 484 485 /* 486 * Contents is __FreeBSD_version, whose relation to OS 487 * versions is defined by a huge table in the Porter's 488 * Handbook. This is the general scheme: 489 * 490 * Releases: 491 * Mmp000 (before 4.10) 492 * Mmi0p0 (before 5.0) 493 * Mmm0p0 494 * 495 * Development branches: 496 * Mmpxxx (before 4.6) 497 * Mmp1xx (before 4.10) 498 * Mmi1xx (before 5.0) 499 * M000xx (pre-M.0) 500 * Mmm1xx 501 * 502 * M = major version 503 * m = minor version 504 * i = minor version increment (491000 -> 4.10) 505 * p = patchlevel 506 * x = revision 507 * 508 * The first release of FreeBSD to use ELF by default 509 * was version 3.0. 510 */ 511 if (desc == 460002) { 512 if (file_printf(ms, " 4.6.2") == -1) 513 return -1; 514 } else if (desc < 460100) { 515 if (file_printf(ms, " %d.%d", desc / 100000, 516 desc / 10000 % 10) == -1) 517 return -1; 518 if (desc / 1000 % 10 > 0) 519 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 520 return -1; 521 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 522 if (file_printf(ms, " (%d)", desc) == -1) 523 return -1; 524 } else if (desc < 500000) { 525 if (file_printf(ms, " %d.%d", desc / 100000, 526 desc / 10000 % 10 + desc / 1000 % 10) == -1) 527 return -1; 528 if (desc / 100 % 10 > 0) { 529 if (file_printf(ms, " (%d)", desc) == -1) 530 return -1; 531 } else if (desc / 10 % 10 > 0) { 532 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 533 return -1; 534 } 535 } else { 536 if (file_printf(ms, " %d.%d", desc / 100000, 537 desc / 1000 % 100) == -1) 538 return -1; 539 if ((desc / 100 % 10 > 0) || 540 (desc % 100000 / 100 == 0)) { 541 if (file_printf(ms, " (%d)", desc) == -1) 542 return -1; 543 } else if (desc / 10 % 10 > 0) { 544 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 545 return -1; 546 } 547 } 548 return 0; 549 } 550 551 file_private int 552 /*ARGSUSED*/ 553 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 554 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 555 size_t noff, size_t doff, int *flags) 556 { 557 if (NAMEEQUALS(RCAST(char *, &nbuf[noff]), "GNU") && 558 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) { 559 uint8_t desc[20]; 560 const char *btype; 561 uint32_t i; 562 *flags |= FLAGS_DID_BUILD_ID; 563 switch (descsz) { 564 case 8: 565 btype = "xxHash"; 566 break; 567 case 16: 568 btype = "md5/uuid"; 569 break; 570 case 20: 571 btype = "sha1"; 572 break; 573 default: 574 btype = "unknown"; 575 break; 576 } 577 if (file_printf(ms, ", BuildID[%s]=", btype) == -1) 578 return -1; 579 memcpy(desc, &nbuf[doff], descsz); 580 for (i = 0; i < descsz; i++) 581 if (file_printf(ms, "%02x", desc[i]) == -1) 582 return -1; 583 return 1; 584 } 585 if (namesz == 4 && memcmp(RCAST(char *, &nbuf[noff]), "Go", 3) == 0 && 586 type == NT_GO_BUILD_ID && descsz < 128) { 587 char buf[256]; 588 if (file_printf(ms, ", Go BuildID=%s", 589 file_copystr(buf, sizeof(buf), descsz, 590 RCAST(const char *, &nbuf[doff]))) == -1) 591 return -1; 592 return 1; 593 } 594 return 0; 595 } 596 597 file_private int 598 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 599 int swap, uint32_t namesz, uint32_t descsz, 600 size_t noff, size_t doff, int *flags) 601 { 602 const char *name = RCAST(const char *, &nbuf[noff]); 603 604 if (NAMEEQUALS(name, "SuSE") && type == NT_GNU_VERSION && descsz == 2) { 605 *flags |= FLAGS_DID_OS_NOTE; 606 if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff], 607 nbuf[doff + 1]) == -1) 608 return -1; 609 return 1; 610 } 611 612 if (NAMEEQUALS(name, "GNU") && type == NT_GNU_VERSION && descsz == 16) { 613 uint32_t desc[4]; 614 memcpy(desc, &nbuf[doff], sizeof(desc)); 615 616 *flags |= FLAGS_DID_OS_NOTE; 617 if (file_printf(ms, ", for GNU/") == -1) 618 return -1; 619 switch (elf_getu32(swap, desc[0])) { 620 case GNU_OS_LINUX: 621 if (file_printf(ms, "Linux") == -1) 622 return -1; 623 break; 624 case GNU_OS_HURD: 625 if (file_printf(ms, "Hurd") == -1) 626 return -1; 627 break; 628 case GNU_OS_SOLARIS: 629 if (file_printf(ms, "Solaris") == -1) 630 return -1; 631 break; 632 case GNU_OS_KFREEBSD: 633 if (file_printf(ms, "kFreeBSD") == -1) 634 return -1; 635 break; 636 case GNU_OS_KNETBSD: 637 if (file_printf(ms, "kNetBSD") == -1) 638 return -1; 639 break; 640 default: 641 if (file_printf(ms, "<unknown>") == -1) 642 return -1; 643 } 644 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 645 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 646 return -1; 647 return 1; 648 } 649 650 if (NAMEEQUALS(name, "NetBSD") && 651 type == NT_NETBSD_VERSION && descsz == 4) { 652 *flags |= FLAGS_DID_OS_NOTE; 653 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1) 654 return -1; 655 return 1; 656 } 657 658 if (NAMEEQUALS(name, "FreeBSD") && 659 type == NT_FREEBSD_VERSION && descsz == 4) { 660 *flags |= FLAGS_DID_OS_NOTE; 661 if (do_note_freebsd_version(ms, swap, &nbuf[doff]) 662 == -1) 663 return -1; 664 return 1; 665 } 666 667 if (NAMEEQUALS(name, "OpenBSD") && 668 type == NT_OPENBSD_VERSION && descsz == 4) { 669 *flags |= FLAGS_DID_OS_NOTE; 670 if (file_printf(ms, ", for OpenBSD") == -1) 671 return -1; 672 /* Content of note is always 0 */ 673 return 1; 674 } 675 676 if (NAMEEQUALS(name, "DragonFly") && 677 type == NT_DRAGONFLY_VERSION && descsz == 4) { 678 uint32_t desc; 679 *flags |= FLAGS_DID_OS_NOTE; 680 if (file_printf(ms, ", for DragonFly") == -1) 681 return -1; 682 memcpy(&desc, &nbuf[doff], sizeof(desc)); 683 desc = elf_getu32(swap, desc); 684 if (file_printf(ms, " %d.%d.%d", desc / 100000, 685 desc / 10000 % 10, desc % 10000) == -1) 686 return -1; 687 return 1; 688 } 689 690 if (NAMEEQUALS(name, "Android") && 691 type == NT_ANDROID_VERSION && descsz >= 4) { 692 uint32_t api_level; 693 *flags |= FLAGS_DID_OS_NOTE; 694 memcpy(&api_level, &nbuf[doff], sizeof(api_level)); 695 api_level = elf_getu32(swap, api_level); 696 if (file_printf(ms, ", for Android %d", api_level) == -1) 697 return -1; 698 /* 699 * NDK r14 and later also include details of the NDK that 700 * built the binary. OS binaries (or binaries built by older 701 * NDKs) don't have this. The NDK release and build number 702 * are both 64-byte strings. 703 */ 704 if (descsz >= 4 + 64 + 64) { 705 if (file_printf(ms, ", built by NDK %.64s (%.64s)", 706 &nbuf[doff + 4], &nbuf[doff + 4 + 64]) == -1) 707 return -1; 708 } 709 } 710 711 return 0; 712 } 713 714 file_private int 715 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 716 int swap, uint32_t namesz, uint32_t descsz, 717 size_t noff, size_t doff, int *flags) 718 { 719 const char *name = RCAST(const char *, &nbuf[noff]); 720 721 if (NAMEEQUALS(name, "PaX") && type == NT_NETBSD_PAX && descsz == 4) { 722 static const char *pax[] = { 723 "+mprotect", 724 "-mprotect", 725 "+segvguard", 726 "-segvguard", 727 "+ASLR", 728 "-ASLR", 729 }; 730 uint32_t desc; 731 size_t i; 732 int did = 0; 733 734 *flags |= FLAGS_DID_NETBSD_PAX; 735 memcpy(&desc, &nbuf[doff], sizeof(desc)); 736 desc = elf_getu32(swap, desc); 737 738 if (desc && file_printf(ms, ", PaX: ") == -1) 739 return -1; 740 741 for (i = 0; i < __arraycount(pax); i++) { 742 if (((1 << CAST(int, i)) & desc) == 0) 743 continue; 744 if (file_printf(ms, "%s%s", did++ ? "," : "", 745 pax[i]) == -1) 746 return -1; 747 } 748 return 1; 749 } 750 return 0; 751 } 752 753 file_private int 754 do_memtag_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 755 int swap, uint32_t namesz, uint32_t descsz, 756 size_t noff, size_t doff, int *flags) 757 { 758 const char *name = RCAST(const char *, &nbuf[noff]); 759 760 if (NAMEEQUALS(name, "Android") && 761 type == NT_ANDROID_MEMTAG && descsz == 4) { 762 static const char *memtag[] = { 763 "none", 764 "async", 765 "sync", 766 "heap", 767 "stack", 768 }; 769 uint32_t desc; 770 size_t i; 771 int did = 0; 772 773 *flags |= FLAGS_DID_ANDROID_MEMTAG; 774 memcpy(&desc, &nbuf[doff], sizeof(desc)); 775 desc = elf_getu32(swap, desc); 776 777 if (desc && file_printf(ms, ", Android Memtag: ") == -1) 778 return -1; 779 780 for (i = 0; i < __arraycount(memtag); i++) { 781 if (((1 << CAST(int, i)) & desc) == 0) 782 continue; 783 if (file_printf(ms, "%s%s", did++ ? "," : "", 784 memtag[i]) == -1) 785 return -1; 786 } 787 return 1; 788 } 789 return 0; 790 } 791 792 file_private int 793 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 794 int swap, uint32_t namesz, uint32_t descsz, 795 size_t noff, size_t doff, int *flags, size_t size, int clazz) 796 { 797 #ifdef ELFCORE 798 char buf[256]; 799 const char *name = RCAST(const char *, &nbuf[noff]); 800 801 int os_style = -1; 802 /* 803 * Sigh. The 2.0.36 kernel in Debian 2.1, at 804 * least, doesn't correctly implement name 805 * sections, in core dumps, as specified by 806 * the "Program Linking" section of "UNIX(R) System 807 * V Release 4 Programmer's Guide: ANSI C and 808 * Programming Support Tools", because my copy 809 * clearly says "The first 'namesz' bytes in 'name' 810 * contain a *null-terminated* [emphasis mine] 811 * character representation of the entry's owner 812 * or originator", but the 2.0.36 kernel code 813 * doesn't include the terminating null in the 814 * name.... 815 */ 816 if ((namesz == 4 && memcmp(name, "CORE", 4) == 0) || 817 NAMEEQUALS(name, "CORE")) { 818 os_style = OS_STYLE_SVR4; 819 } 820 821 if (NAMEEQUALS(name, "FreeBSD")) { 822 os_style = OS_STYLE_FREEBSD; 823 } 824 825 if ((namesz >= 11 && memcmp(name, "NetBSD-CORE", 11) == 0)) { 826 os_style = OS_STYLE_NETBSD; 827 } 828 829 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 830 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 831 == -1) 832 return -1; 833 *flags |= FLAGS_DID_CORE_STYLE; 834 *flags |= os_style; 835 } 836 837 switch (os_style) { 838 case OS_STYLE_NETBSD: 839 if (type == NT_NETBSD_CORE_PROCINFO) { 840 char sbuf[512]; 841 struct NetBSD_elfcore_procinfo pi; 842 memset(&pi, 0, sizeof(pi)); 843 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi))); 844 845 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, " 846 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)", 847 file_printable(ms, sbuf, sizeof(sbuf), 848 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)), 849 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)), 850 elf_getu32(swap, pi.cpi_euid), 851 elf_getu32(swap, pi.cpi_egid), 852 elf_getu32(swap, pi.cpi_nlwps), 853 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)), 854 elf_getu32(swap, pi.cpi_signo), 855 elf_getu32(swap, pi.cpi_sigcode)) == -1) 856 return -1; 857 858 *flags |= FLAGS_DID_CORE; 859 return 1; 860 } 861 break; 862 863 case OS_STYLE_FREEBSD: 864 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 865 size_t argoff, pidoff; 866 867 if (clazz == ELFCLASS32) 868 argoff = 4 + 4 + 17; 869 else 870 argoff = 4 + 4 + 8 + 17; 871 if (file_printf(ms, ", from '%.80s'", nbuf + doff + 872 argoff) == -1) 873 return -1; 874 pidoff = argoff + 81 + 2; 875 if (doff + pidoff + 4 <= size) { 876 if (file_printf(ms, ", pid=%u", 877 elf_getu32(swap, *RCAST(uint32_t *, (nbuf + 878 doff + pidoff)))) == -1) 879 return -1; 880 } 881 *flags |= FLAGS_DID_CORE; 882 } 883 break; 884 885 default: 886 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 887 size_t i, j; 888 unsigned char c; 889 /* 890 * Extract the program name. We assume 891 * it to be 16 characters (that's what it 892 * is in SunOS 5.x and Linux). 893 * 894 * Unfortunately, it's at a different offset 895 * in various OSes, so try multiple offsets. 896 * If the characters aren't all printable, 897 * reject it. 898 */ 899 for (i = 0; i < NOFFSETS; i++) { 900 unsigned char *cname, *cp; 901 size_t reloffset = prpsoffsets(i); 902 size_t noffset = doff + reloffset; 903 size_t k; 904 for (j = 0; j < 16; j++, noffset++, 905 reloffset++) { 906 /* 907 * Make sure we're not past 908 * the end of the buffer; if 909 * we are, just give up. 910 */ 911 if (noffset >= size) 912 goto tryanother; 913 914 /* 915 * Make sure we're not past 916 * the end of the contents; 917 * if we are, this obviously 918 * isn't the right offset. 919 */ 920 if (reloffset >= descsz) 921 goto tryanother; 922 923 c = nbuf[noffset]; 924 if (c == '\0') { 925 /* 926 * A '\0' at the 927 * beginning is 928 * obviously wrong. 929 * Any other '\0' 930 * means we're done. 931 */ 932 if (j == 0) 933 goto tryanother; 934 else 935 break; 936 } else { 937 /* 938 * A nonprintable 939 * character is also 940 * wrong. 941 */ 942 if (!isprint(c) || isquote(c)) 943 goto tryanother; 944 } 945 } 946 /* 947 * Well, that worked. 948 */ 949 950 /* 951 * Try next offsets, in case this match is 952 * in the middle of a string. 953 */ 954 for (k = i + 1 ; k < NOFFSETS; k++) { 955 size_t no; 956 int adjust = 1; 957 if (prpsoffsets(k) >= prpsoffsets(i)) 958 continue; 959 /* 960 * pr_fname == pr_psargs - 16 && 961 * non-nul-terminated fname (qemu) 962 */ 963 if (prpsoffsets(k) == 964 prpsoffsets(i) - 16 && j == 16) 965 continue; 966 for (no = doff + prpsoffsets(k); 967 no < doff + prpsoffsets(i); no++) 968 adjust = adjust 969 && isprint(nbuf[no]); 970 if (adjust) 971 i = k; 972 } 973 974 cname = CAST(unsigned char *, 975 &nbuf[doff + prpsoffsets(i)]); 976 for (cp = cname; cp < nbuf + size && *cp 977 && isprint(*cp); cp++) 978 continue; 979 /* 980 * Linux apparently appends a space at the end 981 * of the command line: remove it. 982 */ 983 while (cp > cname && isspace(cp[-1])) 984 cp--; 985 if (file_printf(ms, ", from '%s'", 986 file_copystr(buf, sizeof(buf), 987 CAST(size_t, cp - cname), 988 RCAST(char *, cname))) == -1) 989 return -1; 990 *flags |= FLAGS_DID_CORE; 991 return 1; 992 993 tryanother: 994 ; 995 } 996 } 997 break; 998 } 999 #endif 1000 return 0; 1001 } 1002 1003 file_private off_t 1004 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, 1005 off_t off, int num, off_t fsize, uint64_t virtaddr) 1006 { 1007 Elf32_Phdr ph32; 1008 Elf64_Phdr ph64; 1009 1010 /* 1011 * Loop through all the program headers and find the header with 1012 * virtual address in which the "virtaddr" belongs to. 1013 */ 1014 for ( ; num; num--) { 1015 if (pread(fd, xph_addr, xph_sizeof, off) < 1016 CAST(ssize_t, xph_sizeof)) { 1017 if (file_printf(ms, 1018 ", can't read elf program header at %jd", 1019 (intmax_t)off) == -1) 1020 return -1; 1021 return 0; 1022 1023 } 1024 off += xph_sizeof; 1025 1026 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1027 /* Perhaps warn here */ 1028 continue; 1029 } 1030 1031 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) 1032 return xph_offset + (virtaddr - xph_vaddr); 1033 } 1034 return 0; 1035 } 1036 1037 file_private size_t 1038 get_string_on_virtaddr(struct magic_set *ms, 1039 int swap, int clazz, int fd, off_t ph_off, int ph_num, 1040 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) 1041 { 1042 char *bptr; 1043 off_t offset; 1044 1045 if (buflen == 0) 1046 return 0; 1047 1048 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, 1049 fsize, virtaddr); 1050 if (offset < 0 || 1051 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) { 1052 (void)file_printf(ms, ", can't read elf string at %jd", 1053 (intmax_t)offset); 1054 return 0; 1055 } 1056 1057 buf[buflen - 1] = '\0'; 1058 1059 /* We expect only printable characters, so return if buffer contains 1060 * non-printable character before the '\0' or just '\0'. */ 1061 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++) 1062 continue; 1063 if (*bptr != '\0') 1064 return 0; 1065 1066 return bptr - buf; 1067 } 1068 1069 1070 /*ARGSUSED*/ 1071 file_private int 1072 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 1073 int swap, uint32_t namesz __attribute__((__unused__)), 1074 uint32_t descsz __attribute__((__unused__)), 1075 size_t noff __attribute__((__unused__)), size_t doff, 1076 int *flags, size_t size __attribute__((__unused__)), int clazz, 1077 int fd, off_t ph_off, int ph_num, off_t fsize) 1078 { 1079 #ifdef ELFCORE 1080 Aux32Info auxv32; 1081 Aux64Info auxv64; 1082 size_t elsize = xauxv_sizeof; 1083 const char *tag; 1084 int is_string; 1085 size_t nval, off; 1086 1087 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != 1088 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) 1089 return 0; 1090 1091 switch (*flags & FLAGS_CORE_STYLE) { 1092 case OS_STYLE_SVR4: 1093 if (type != NT_AUXV) 1094 return 0; 1095 break; 1096 #ifdef notyet 1097 case OS_STYLE_NETBSD: 1098 if (type != NT_NETBSD_CORE_AUXV) 1099 return 0; 1100 break; 1101 case OS_STYLE_FREEBSD: 1102 if (type != NT_FREEBSD_PROCSTAT_AUXV) 1103 return 0; 1104 break; 1105 #endif 1106 default: 1107 return 0; 1108 } 1109 1110 *flags |= FLAGS_DID_AUXV; 1111 1112 nval = 0; 1113 for (off = 0; off + elsize <= descsz; off += elsize) { 1114 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 1115 /* Limit processing to 50 vector entries to prevent DoS */ 1116 if (nval++ >= 50) { 1117 file_error(ms, 0, "Too many ELF Auxv elements"); 1118 return 1; 1119 } 1120 1121 switch(xauxv_type) { 1122 case AT_LINUX_EXECFN: 1123 is_string = 1; 1124 tag = "execfn"; 1125 break; 1126 case AT_LINUX_PLATFORM: 1127 is_string = 1; 1128 tag = "platform"; 1129 break; 1130 case AT_LINUX_UID: 1131 is_string = 0; 1132 tag = "real uid"; 1133 break; 1134 case AT_LINUX_GID: 1135 is_string = 0; 1136 tag = "real gid"; 1137 break; 1138 case AT_LINUX_EUID: 1139 is_string = 0; 1140 tag = "effective uid"; 1141 break; 1142 case AT_LINUX_EGID: 1143 is_string = 0; 1144 tag = "effective gid"; 1145 break; 1146 default: 1147 is_string = 0; 1148 tag = NULL; 1149 break; 1150 } 1151 1152 if (tag == NULL) 1153 continue; 1154 1155 if (is_string) { 1156 char buf[256]; 1157 ssize_t buflen; 1158 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 1159 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 1160 1161 if (buflen == 0) 1162 continue; 1163 1164 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 1165 return -1; 1166 } else { 1167 if (file_printf(ms, ", %s: %d", tag, 1168 CAST(int, xauxv_val)) == -1) 1169 return -1; 1170 } 1171 } 1172 return 1; 1173 #else 1174 return 0; 1175 #endif 1176 } 1177 1178 file_private size_t 1179 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1180 int clazz, int swap, int *pie, size_t *need) 1181 { 1182 Elf32_Dyn dh32; 1183 Elf64_Dyn dh64; 1184 unsigned char *dbuf = CAST(unsigned char *, vbuf); 1185 1186 if (xdh_sizeof + offset > size) { 1187 /* 1188 * We're out of note headers. 1189 */ 1190 return xdh_sizeof + offset; 1191 } 1192 1193 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof); 1194 offset += xdh_sizeof; 1195 1196 switch (xdh_tag) { 1197 case DT_FLAGS_1: 1198 if (xdh_val & DF_1_PIE) { 1199 *pie = 1; 1200 ms->mode |= 0111; 1201 } else 1202 ms->mode &= ~0111; 1203 break; 1204 case DT_NEEDED: 1205 (*need)++; 1206 break; 1207 default: 1208 break; 1209 } 1210 return offset; 1211 } 1212 1213 1214 file_private size_t 1215 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1216 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1217 int fd, off_t ph_off, int ph_num, off_t fsize) 1218 { 1219 Elf32_Nhdr nh32; 1220 Elf64_Nhdr nh64; 1221 size_t noff, doff; 1222 uint32_t namesz, descsz; 1223 char buf[256]; 1224 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1225 1226 if (*notecount == 0) 1227 return 0; 1228 --*notecount; 1229 1230 if (xnh_sizeof + offset > size) { 1231 /* 1232 * We're out of note headers. 1233 */ 1234 return xnh_sizeof + offset; 1235 } 1236 /*XXX: GCC */ 1237 memset(&nh32, 0, sizeof(nh32)); 1238 memset(&nh64, 0, sizeof(nh64)); 1239 1240 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1241 offset += xnh_sizeof; 1242 1243 namesz = xnh_namesz; 1244 descsz = xnh_descsz; 1245 1246 if ((namesz == 0) && (descsz == 0)) { 1247 /* 1248 * We're out of note headers. 1249 */ 1250 return (offset >= size) ? offset : size; 1251 } 1252 1253 if (namesz & 0x80000000) { 1254 (void)file_printf(ms, ", bad note name size %#lx", 1255 CAST(unsigned long, namesz)); 1256 return 0; 1257 } 1258 1259 if (descsz & 0x80000000) { 1260 (void)file_printf(ms, ", bad note description size %#lx", 1261 CAST(unsigned long, descsz)); 1262 return 0; 1263 } 1264 1265 noff = offset; 1266 doff = ELF_ALIGN(offset + namesz); 1267 1268 if (offset + namesz > size) { 1269 /* 1270 * We're past the end of the buffer. 1271 */ 1272 return doff; 1273 } 1274 1275 offset = ELF_ALIGN(doff + descsz); 1276 if (doff + descsz > size) { 1277 /* 1278 * We're past the end of the buffer. 1279 */ 1280 return (offset >= size) ? offset : size; 1281 } 1282 1283 1284 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1285 if (do_os_note(ms, nbuf, xnh_type, swap, 1286 namesz, descsz, noff, doff, flags)) 1287 return offset; 1288 } 1289 1290 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1291 if (do_bid_note(ms, nbuf, xnh_type, swap, 1292 namesz, descsz, noff, doff, flags)) 1293 return offset; 1294 } 1295 1296 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1297 if (do_pax_note(ms, nbuf, xnh_type, swap, 1298 namesz, descsz, noff, doff, flags)) 1299 return offset; 1300 } 1301 if ((*flags & FLAGS_DID_ANDROID_MEMTAG) == 0) { 1302 if (do_memtag_note(ms, nbuf, xnh_type, swap, 1303 namesz, descsz, noff, doff, flags)) 1304 return offset; 1305 } 1306 1307 if ((*flags & FLAGS_DID_CORE) == 0) { 1308 if (do_core_note(ms, nbuf, xnh_type, swap, 1309 namesz, descsz, noff, doff, flags, size, clazz)) 1310 return offset; 1311 } 1312 1313 if ((*flags & FLAGS_DID_AUXV) == 0) { 1314 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1315 namesz, descsz, noff, doff, flags, size, clazz, 1316 fd, ph_off, ph_num, fsize)) 1317 return offset; 1318 } 1319 1320 if (NAMEEQUALS(RCAST(char *, &nbuf[noff]), "NetBSD")) { 1321 int descw, flag; 1322 const char *str, *tag; 1323 if (descsz > 100) 1324 descsz = 100; 1325 switch (xnh_type) { 1326 case NT_NETBSD_VERSION: 1327 return offset; 1328 case NT_NETBSD_MARCH: 1329 flag = FLAGS_DID_NETBSD_MARCH; 1330 tag = "compiled for"; 1331 break; 1332 case NT_NETBSD_CMODEL: 1333 flag = FLAGS_DID_NETBSD_CMODEL; 1334 tag = "compiler model"; 1335 break; 1336 case NT_NETBSD_EMULATION: 1337 flag = FLAGS_DID_NETBSD_EMULATION; 1338 tag = "emulation:"; 1339 break; 1340 default: 1341 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1342 return offset; 1343 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1344 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1345 return offset; 1346 return offset; 1347 } 1348 1349 if (*flags & flag) 1350 return offset; 1351 str = RCAST(const char *, &nbuf[doff]); 1352 descw = CAST(int, descsz); 1353 *flags |= flag; 1354 file_printf(ms, ", %s: %s", tag, 1355 file_copystr(buf, sizeof(buf), descw, str)); 1356 return offset; 1357 } 1358 1359 return offset; 1360 } 1361 1362 /* SunOS 5.x hardware capability descriptions */ 1363 typedef struct cap_desc { 1364 uint64_t cd_mask; 1365 const char *cd_name; 1366 } cap_desc_t; 1367 1368 static const cap_desc_t cap_desc_sparc[] = { 1369 { AV_SPARC_MUL32, "MUL32" }, 1370 { AV_SPARC_DIV32, "DIV32" }, 1371 { AV_SPARC_FSMULD, "FSMULD" }, 1372 { AV_SPARC_V8PLUS, "V8PLUS" }, 1373 { AV_SPARC_POPC, "POPC" }, 1374 { AV_SPARC_VIS, "VIS" }, 1375 { AV_SPARC_VIS2, "VIS2" }, 1376 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1377 { AV_SPARC_FMAF, "FMAF" }, 1378 { AV_SPARC_FJFMAU, "FJFMAU" }, 1379 { AV_SPARC_IMA, "IMA" }, 1380 { 0, NULL } 1381 }; 1382 1383 static const cap_desc_t cap_desc_386[] = { 1384 { AV_386_FPU, "FPU" }, 1385 { AV_386_TSC, "TSC" }, 1386 { AV_386_CX8, "CX8" }, 1387 { AV_386_SEP, "SEP" }, 1388 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1389 { AV_386_CMOV, "CMOV" }, 1390 { AV_386_MMX, "MMX" }, 1391 { AV_386_AMD_MMX, "AMD_MMX" }, 1392 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1393 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1394 { AV_386_FXSR, "FXSR" }, 1395 { AV_386_SSE, "SSE" }, 1396 { AV_386_SSE2, "SSE2" }, 1397 { AV_386_PAUSE, "PAUSE" }, 1398 { AV_386_SSE3, "SSE3" }, 1399 { AV_386_MON, "MON" }, 1400 { AV_386_CX16, "CX16" }, 1401 { AV_386_AHF, "AHF" }, 1402 { AV_386_TSCP, "TSCP" }, 1403 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1404 { AV_386_POPCNT, "POPCNT" }, 1405 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1406 { AV_386_SSSE3, "SSSE3" }, 1407 { AV_386_SSE4_1, "SSE4.1" }, 1408 { AV_386_SSE4_2, "SSE4.2" }, 1409 { 0, NULL } 1410 }; 1411 1412 file_private int 1413 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1414 size_t size, off_t fsize, int mach, int strtab, int *flags, 1415 uint16_t *notecount) 1416 { 1417 Elf32_Shdr sh32; 1418 Elf64_Shdr sh64; 1419 int stripped = 1, has_debug_info = 0; 1420 size_t nbadcap = 0; 1421 void *nbuf; 1422 off_t noff, coff, name_off, offs; 1423 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ 1424 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ 1425 char name[50]; 1426 ssize_t namesize; 1427 1428 if (ms->flags & MAGIC_MIME) 1429 return 0; 1430 1431 if (num == 0) { 1432 if (file_printf(ms, ", no section header") == -1) 1433 return -1; 1434 return 0; 1435 } 1436 if (size != xsh_sizeof) { 1437 if (file_printf(ms, ", corrupted section header size") == -1) 1438 return -1; 1439 return 0; 1440 } 1441 1442 /* Read offset of name section to be able to read section names later */ 1443 offs = CAST(off_t, (off + size * strtab)); 1444 if (pread(fd, xsh_addr, xsh_sizeof, offs) < CAST(ssize_t, xsh_sizeof)) { 1445 if (file_printf(ms, ", missing section headers at %jd", 1446 (intmax_t)offs) == -1) 1447 return -1; 1448 return 0; 1449 } 1450 name_off = xsh_offset; 1451 1452 if (fsize != SIZE_UNKNOWN && fsize < name_off) { 1453 if (file_printf(ms, ", too large section header offset %jd", 1454 (intmax_t)name_off) == -1) 1455 return -1; 1456 return 0; 1457 } 1458 1459 for ( ; num; num--) { 1460 /* Read the name of this section. */ 1461 offs = name_off + xsh_name; 1462 if ((namesize = pread(fd, name, sizeof(name) - 1, offs)) 1463 == -1) { 1464 if (file_printf(ms, 1465 ", can't read name of elf section at %jd", 1466 (intmax_t)offs) == -1) 1467 return -1; 1468 return 0; 1469 } 1470 name[namesize] = '\0'; 1471 if (strcmp(name, ".debug_info") == 0) { 1472 has_debug_info = 1; 1473 stripped = 0; 1474 } 1475 1476 if (pread(fd, xsh_addr, xsh_sizeof, off) < 1477 CAST(ssize_t, xsh_sizeof)) { 1478 if (file_printf(ms, ", can't read elf section at %jd", 1479 (intmax_t)off) == -1) 1480 return -1; 1481 return 0; 1482 } 1483 off += size; 1484 1485 /* Things we can determine before we seek */ 1486 switch (xsh_type) { 1487 case SHT_SYMTAB: 1488 #if 0 1489 case SHT_DYNSYM: 1490 #endif 1491 stripped = 0; 1492 break; 1493 default: 1494 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1495 /* Perhaps warn here */ 1496 continue; 1497 } 1498 break; 1499 } 1500 1501 1502 /* Things we can determine when we seek */ 1503 switch (xsh_type) { 1504 case SHT_NOTE: 1505 if (CAST(uintmax_t, (xsh_size + xsh_offset)) > 1506 CAST(uintmax_t, fsize)) { 1507 if (file_printf(ms, 1508 ", note offset/size %#" INTMAX_T_FORMAT 1509 "x+%#" INTMAX_T_FORMAT "x exceeds" 1510 " file size %#" INTMAX_T_FORMAT "x", 1511 CAST(uintmax_t, xsh_offset), 1512 CAST(uintmax_t, xsh_size), 1513 CAST(uintmax_t, fsize)) == -1) 1514 return -1; 1515 return 0; 1516 } 1517 if (xsh_size > ms->elf_shsize_max) { 1518 file_error(ms, errno, "Note section size too " 1519 "big (%ju > %zu)", (uintmax_t)xsh_size, 1520 ms->elf_shsize_max); 1521 return -1; 1522 } 1523 if ((nbuf = malloc(xsh_size)) == NULL) { 1524 file_error(ms, errno, "Cannot allocate memory" 1525 " for note"); 1526 return -1; 1527 } 1528 offs = xsh_offset; 1529 if (pread(fd, nbuf, xsh_size, offs) < 1530 CAST(ssize_t, xsh_size)) { 1531 free(nbuf); 1532 if (file_printf(ms, 1533 ", can't read elf note at %jd", 1534 (intmax_t)offs) == -1) 1535 return -1; 1536 return 0; 1537 } 1538 1539 noff = 0; 1540 for (;;) { 1541 if (noff >= CAST(off_t, xsh_size)) 1542 break; 1543 noff = donote(ms, nbuf, CAST(size_t, noff), 1544 xsh_size, clazz, swap, 4, flags, notecount, 1545 fd, 0, 0, 0); 1546 if (noff == 0) 1547 break; 1548 } 1549 free(nbuf); 1550 break; 1551 case SHT_SUNW_cap: 1552 switch (mach) { 1553 case EM_SPARC: 1554 case EM_SPARCV9: 1555 case EM_IA_64: 1556 case EM_386: 1557 case EM_AMD64: 1558 break; 1559 default: 1560 goto skip; 1561 } 1562 1563 if (nbadcap > 5) 1564 break; 1565 if (lseek(fd, xsh_offset, SEEK_SET) 1566 == CAST(off_t, -1)) { 1567 file_badseek(ms); 1568 return -1; 1569 } 1570 coff = 0; 1571 for (;;) { 1572 Elf32_Cap cap32; 1573 Elf64_Cap cap64; 1574 cap32.c_un.c_val = 0; 1575 cap64.c_un.c_val = 0; 1576 char cbuf[/*CONSTCOND*/ 1577 MAX(sizeof(cap32), sizeof(cap64))]; 1578 if ((coff += xcap_sizeof) > 1579 CAST(off_t, xsh_size)) 1580 break; 1581 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) != 1582 CAST(ssize_t, xcap_sizeof)) { 1583 file_badread(ms); 1584 return -1; 1585 } 1586 if (cbuf[0] == 'A') { 1587 #ifdef notyet 1588 char *p = cbuf + 1; 1589 uint32_t len, tag; 1590 memcpy(&len, p, sizeof(len)); 1591 p += 4; 1592 len = getu32(swap, len); 1593 if (memcmp("gnu", p, 3) != 0) { 1594 if (file_printf(ms, 1595 ", unknown capability %.3s", p) 1596 == -1) 1597 return -1; 1598 break; 1599 } 1600 p += strlen(p) + 1; 1601 tag = *p++; 1602 memcpy(&len, p, sizeof(len)); 1603 p += 4; 1604 len = getu32(swap, len); 1605 if (tag != 1) { 1606 if (file_printf(ms, ", unknown gnu" 1607 " capability tag %d", tag) 1608 == -1) 1609 return -1; 1610 break; 1611 } 1612 // gnu attributes 1613 #endif 1614 break; 1615 } 1616 memcpy(xcap_addr, cbuf, xcap_sizeof); 1617 switch (xcap_tag) { 1618 case CA_SUNW_NULL: 1619 break; 1620 case CA_SUNW_HW_1: 1621 cap_hw1 |= xcap_val; 1622 break; 1623 case CA_SUNW_SF_1: 1624 cap_sf1 |= xcap_val; 1625 break; 1626 default: 1627 if (file_printf(ms, 1628 ", with unknown capability " 1629 "%#" INT64_T_FORMAT "x = %#" 1630 INT64_T_FORMAT "x", 1631 CAST(unsigned long long, xcap_tag), 1632 CAST(unsigned long long, xcap_val)) 1633 == -1) 1634 return -1; 1635 if (nbadcap++ > 2) 1636 coff = xsh_size; 1637 break; 1638 } 1639 } 1640 /*FALLTHROUGH*/ 1641 skip: 1642 default: 1643 break; 1644 } 1645 } 1646 1647 if (has_debug_info) { 1648 if (file_printf(ms, ", with debug_info") == -1) 1649 return -1; 1650 } 1651 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1652 return -1; 1653 if (cap_hw1) { 1654 const cap_desc_t *cdp; 1655 switch (mach) { 1656 case EM_SPARC: 1657 case EM_SPARC32PLUS: 1658 case EM_SPARCV9: 1659 cdp = cap_desc_sparc; 1660 break; 1661 case EM_386: 1662 case EM_IA_64: 1663 case EM_AMD64: 1664 cdp = cap_desc_386; 1665 break; 1666 default: 1667 cdp = NULL; 1668 break; 1669 } 1670 if (file_printf(ms, ", uses") == -1) 1671 return -1; 1672 if (cdp) { 1673 while (cdp->cd_name) { 1674 if (cap_hw1 & cdp->cd_mask) { 1675 if (file_printf(ms, 1676 " %s", cdp->cd_name) == -1) 1677 return -1; 1678 cap_hw1 &= ~cdp->cd_mask; 1679 } 1680 ++cdp; 1681 } 1682 if (cap_hw1) 1683 if (file_printf(ms, 1684 " unknown hardware capability %#" 1685 INT64_T_FORMAT "x", 1686 CAST(unsigned long long, cap_hw1)) == -1) 1687 return -1; 1688 } else { 1689 if (file_printf(ms, 1690 " hardware capability %#" INT64_T_FORMAT "x", 1691 CAST(unsigned long long, cap_hw1)) == -1) 1692 return -1; 1693 } 1694 } 1695 if (cap_sf1) { 1696 if (cap_sf1 & SF1_SUNW_FPUSED) { 1697 if (file_printf(ms, 1698 (cap_sf1 & SF1_SUNW_FPKNWN) 1699 ? ", uses frame pointer" 1700 : ", not known to use frame pointer") == -1) 1701 return -1; 1702 } 1703 cap_sf1 &= ~SF1_SUNW_MASK; 1704 if (cap_sf1) 1705 if (file_printf(ms, 1706 ", with unknown software capability %#" 1707 INT64_T_FORMAT "x", 1708 CAST(unsigned long long, cap_sf1)) == -1) 1709 return -1; 1710 } 1711 return 0; 1712 } 1713 1714 /* 1715 * Look through the program headers of an executable image, to determine 1716 * if it is statically or dynamically linked. If it has a dynamic section, 1717 * it is pie, and does not have an interpreter or needed libraries, we 1718 * call it static pie. 1719 */ 1720 file_private int 1721 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1722 int num, size_t size, off_t fsize, int sh_num, int *flags, 1723 uint16_t *notecount) 1724 { 1725 Elf32_Phdr ph32; 1726 Elf64_Phdr ph64; 1727 const char *linking_style; 1728 unsigned char nbuf[NBUFSIZE]; 1729 char interp[128]; 1730 ssize_t bufsize; 1731 size_t offset, align, need = 0; 1732 int pie = 0, dynamic = 0; 1733 1734 if (num == 0) { 1735 if (file_printf(ms, ", no program header") == -1) 1736 return -1; 1737 return 0; 1738 } 1739 if (size != xph_sizeof) { 1740 if (file_printf(ms, ", corrupted program header size") == -1) 1741 return -1; 1742 return 0; 1743 } 1744 1745 interp[0] = '\0'; 1746 for ( ; num; num--) { 1747 int doread; 1748 if (pread(fd, xph_addr, xph_sizeof, off) < 1749 CAST(ssize_t, xph_sizeof)) { 1750 if (file_printf(ms, 1751 ", can't read elf program headers at %jd", 1752 (intmax_t)off) == -1) 1753 return -1; 1754 return 0; 1755 } 1756 1757 off += size; 1758 bufsize = 0; 1759 align = 4; 1760 1761 /* Things we can determine before we seek */ 1762 switch (xph_type) { 1763 case PT_DYNAMIC: 1764 doread = 1; 1765 break; 1766 case PT_NOTE: 1767 if (sh_num) /* Did this through section headers */ 1768 continue; 1769 if (((align = xph_align) & 0x80000000UL) != 0 || 1770 align < 4) { 1771 if (file_printf(ms, 1772 ", invalid note alignment %#lx", 1773 CAST(unsigned long, align)) == -1) 1774 return -1; 1775 align = 4; 1776 } 1777 /*FALLTHROUGH*/ 1778 case PT_INTERP: 1779 doread = 1; 1780 break; 1781 default: 1782 doread = 0; 1783 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1784 /* Maybe warn here? */ 1785 continue; 1786 } 1787 break; 1788 } 1789 1790 if (doread) { 1791 size_t len = xph_filesz < sizeof(nbuf) ? xph_filesz 1792 : sizeof(nbuf); 1793 off_t offs = xph_offset; 1794 bufsize = pread(fd, nbuf, len, offs); 1795 if (bufsize == -1) { 1796 if (file_printf(ms, 1797 ", can't read section at %jd", 1798 (intmax_t)offs) == -1) 1799 return -1; 1800 return 0; 1801 } 1802 } 1803 1804 /* Things we can determine when we seek */ 1805 switch (xph_type) { 1806 case PT_DYNAMIC: 1807 dynamic = 1; 1808 offset = 0; 1809 // Let DF_1 determine if we are PIE or not. 1810 ms->mode &= ~0111; 1811 for (;;) { 1812 if (offset >= CAST(size_t, bufsize)) 1813 break; 1814 offset = dodynamic(ms, nbuf, offset, 1815 CAST(size_t, bufsize), clazz, swap, 1816 &pie, &need); 1817 if (offset == 0) 1818 break; 1819 } 1820 if (ms->flags & MAGIC_MIME) 1821 continue; 1822 break; 1823 1824 case PT_INTERP: 1825 need++; 1826 if (ms->flags & MAGIC_MIME) 1827 continue; 1828 if (bufsize && nbuf[0]) { 1829 nbuf[bufsize - 1] = '\0'; 1830 memcpy(interp, nbuf, CAST(size_t, bufsize)); 1831 } else 1832 strlcpy(interp, "*empty*", sizeof(interp)); 1833 break; 1834 case PT_NOTE: 1835 if (ms->flags & MAGIC_MIME) 1836 return 0; 1837 /* 1838 * This is a PT_NOTE section; loop through all the notes 1839 * in the section. 1840 */ 1841 offset = 0; 1842 for (;;) { 1843 if (offset >= CAST(size_t, bufsize)) 1844 break; 1845 offset = donote(ms, nbuf, offset, 1846 CAST(size_t, bufsize), clazz, swap, align, 1847 flags, notecount, fd, 0, 0, 0); 1848 if (offset == 0) 1849 break; 1850 } 1851 break; 1852 default: 1853 if (ms->flags & MAGIC_MIME) 1854 continue; 1855 break; 1856 } 1857 } 1858 if (ms->flags & MAGIC_MIME) 1859 return 0; 1860 if (dynamic) { 1861 if (pie && need == 0) 1862 linking_style = "static-pie"; 1863 else 1864 linking_style = "dynamically"; 1865 } else { 1866 linking_style = "statically"; 1867 } 1868 if (file_printf(ms, ", %s linked", linking_style) == -1) 1869 return -1; 1870 if (interp[0]) 1871 if (file_printf(ms, ", interpreter %s", file_printable(ms, 1872 CAST(char *, nbuf), sizeof(nbuf), 1873 interp, sizeof(interp))) == -1) 1874 return -1; 1875 return 0; 1876 } 1877 1878 1879 file_protected int 1880 file_tryelf(struct magic_set *ms, const struct buffer *b) 1881 { 1882 int fd = b->fd; 1883 const unsigned char *buf = CAST(const unsigned char *, b->fbuf); 1884 size_t nbytes = b->flen; 1885 union { 1886 int32_t l; 1887 char c[sizeof(int32_t)]; 1888 } u; 1889 int clazz; 1890 int swap; 1891 struct stat st; 1892 const struct stat *stp; 1893 off_t fsize; 1894 int flags = 0; 1895 Elf32_Ehdr elf32hdr; 1896 Elf64_Ehdr elf64hdr; 1897 uint16_t type, phnum, shnum, notecount; 1898 1899 if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION)) 1900 return 0; 1901 /* 1902 * ELF executables have multiple section headers in arbitrary 1903 * file locations and thus file(1) cannot determine it from easily. 1904 * Instead we traverse thru all section headers until a symbol table 1905 * one is found or else the binary is stripped. 1906 * Return immediately if it's not ELF (so we avoid pipe2file unless 1907 * needed). 1908 */ 1909 if (buf[EI_MAG0] != ELFMAG0 1910 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1911 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1912 return 0; 1913 1914 /* 1915 * If we cannot seek, it must be a pipe, socket or fifo. 1916 */ 1917 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) 1918 && (errno == ESPIPE)) 1919 fd = file_pipe2file(ms, fd, buf, nbytes); 1920 1921 if (fd == -1) { 1922 file_badread(ms); 1923 return -1; 1924 } 1925 1926 stp = &b->st; 1927 /* 1928 * b->st.st_size != 0 if previous fstat() succeeded, 1929 * which is likely, we can avoid extra stat() call. 1930 */ 1931 if (b->st.st_size == 0) { 1932 stp = &st; 1933 if (fstat(fd, &st) == -1) { 1934 file_badread(ms); 1935 return -1; 1936 } 1937 } 1938 if (S_ISREG(stp->st_mode) || stp->st_size != 0) 1939 fsize = stp->st_size; 1940 else 1941 fsize = SIZE_UNKNOWN; 1942 1943 clazz = buf[EI_CLASS]; 1944 1945 switch (clazz) { 1946 case ELFCLASS32: 1947 #undef elf_getu 1948 #define elf_getu(a, b) elf_getu32(a, b) 1949 #undef elfhdr 1950 #define elfhdr elf32hdr 1951 #include "elfclass.h" 1952 case ELFCLASS64: 1953 #undef elf_getu 1954 #define elf_getu(a, b) elf_getu64(a, b) 1955 #undef elfhdr 1956 #define elfhdr elf64hdr 1957 #include "elfclass.h" 1958 default: 1959 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1960 return -1; 1961 break; 1962 } 1963 return 0; 1964 } 1965 #endif 1966