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 1.175 2020/12/17 20:43:37 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(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 CAST(const 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 if (file_printf(ms, ", can't read elf string at %jd", 986 (intmax_t)offset) == -1) 987 return -1; 988 return 0; 989 } 990 991 buf[buflen - 1] = '\0'; 992 993 /* We expect only printable characters, so return if buffer contains 994 * non-printable character before the '\0' or just '\0'. */ 995 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++) 996 continue; 997 if (*bptr != '\0') 998 return 0; 999 1000 return bptr - buf; 1001 } 1002 1003 1004 /*ARGSUSED*/ 1005 private int 1006 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 1007 int swap, uint32_t namesz __attribute__((__unused__)), 1008 uint32_t descsz __attribute__((__unused__)), 1009 size_t noff __attribute__((__unused__)), size_t doff, 1010 int *flags, size_t size __attribute__((__unused__)), int clazz, 1011 int fd, off_t ph_off, int ph_num, off_t fsize) 1012 { 1013 #ifdef ELFCORE 1014 Aux32Info auxv32; 1015 Aux64Info auxv64; 1016 size_t elsize = xauxv_sizeof; 1017 const char *tag; 1018 int is_string; 1019 size_t nval; 1020 1021 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != 1022 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) 1023 return 0; 1024 1025 switch (*flags & FLAGS_CORE_STYLE) { 1026 case OS_STYLE_SVR4: 1027 if (type != NT_AUXV) 1028 return 0; 1029 break; 1030 #ifdef notyet 1031 case OS_STYLE_NETBSD: 1032 if (type != NT_NETBSD_CORE_AUXV) 1033 return 0; 1034 break; 1035 case OS_STYLE_FREEBSD: 1036 if (type != NT_FREEBSD_PROCSTAT_AUXV) 1037 return 0; 1038 break; 1039 #endif 1040 default: 1041 return 0; 1042 } 1043 1044 *flags |= FLAGS_DID_AUXV; 1045 1046 nval = 0; 1047 for (size_t off = 0; off + elsize <= descsz; off += elsize) { 1048 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 1049 /* Limit processing to 50 vector entries to prevent DoS */ 1050 if (nval++ >= 50) { 1051 file_error(ms, 0, "Too many ELF Auxv elements"); 1052 return 1; 1053 } 1054 1055 switch(xauxv_type) { 1056 case AT_LINUX_EXECFN: 1057 is_string = 1; 1058 tag = "execfn"; 1059 break; 1060 case AT_LINUX_PLATFORM: 1061 is_string = 1; 1062 tag = "platform"; 1063 break; 1064 case AT_LINUX_UID: 1065 is_string = 0; 1066 tag = "real uid"; 1067 break; 1068 case AT_LINUX_GID: 1069 is_string = 0; 1070 tag = "real gid"; 1071 break; 1072 case AT_LINUX_EUID: 1073 is_string = 0; 1074 tag = "effective uid"; 1075 break; 1076 case AT_LINUX_EGID: 1077 is_string = 0; 1078 tag = "effective gid"; 1079 break; 1080 default: 1081 is_string = 0; 1082 tag = NULL; 1083 break; 1084 } 1085 1086 if (tag == NULL) 1087 continue; 1088 1089 if (is_string) { 1090 char buf[256]; 1091 ssize_t buflen; 1092 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 1093 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 1094 1095 if (buflen == 0) 1096 continue; 1097 1098 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 1099 return -1; 1100 } else { 1101 if (file_printf(ms, ", %s: %d", tag, 1102 CAST(int, xauxv_val)) == -1) 1103 return -1; 1104 } 1105 } 1106 return 1; 1107 #else 1108 return 0; 1109 #endif 1110 } 1111 1112 private size_t 1113 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1114 int clazz, int swap, int *pie, size_t *need) 1115 { 1116 Elf32_Dyn dh32; 1117 Elf64_Dyn dh64; 1118 unsigned char *dbuf = CAST(unsigned char *, vbuf); 1119 1120 if (xdh_sizeof + offset > size) { 1121 /* 1122 * We're out of note headers. 1123 */ 1124 return xdh_sizeof + offset; 1125 } 1126 1127 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof); 1128 offset += xdh_sizeof; 1129 1130 switch (xdh_tag) { 1131 case DT_FLAGS_1: 1132 *pie = 1; 1133 if (xdh_val & DF_1_PIE) 1134 ms->mode |= 0111; 1135 else 1136 ms->mode &= ~0111; 1137 break; 1138 case DT_NEEDED: 1139 (*need)++; 1140 break; 1141 default: 1142 break; 1143 } 1144 return offset; 1145 } 1146 1147 1148 private size_t 1149 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1150 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1151 int fd, off_t ph_off, int ph_num, off_t fsize) 1152 { 1153 Elf32_Nhdr nh32; 1154 Elf64_Nhdr nh64; 1155 size_t noff, doff; 1156 uint32_t namesz, descsz; 1157 char buf[256]; 1158 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1159 1160 if (*notecount == 0) 1161 return 0; 1162 --*notecount; 1163 1164 if (xnh_sizeof + offset > size) { 1165 /* 1166 * We're out of note headers. 1167 */ 1168 return xnh_sizeof + offset; 1169 } 1170 /*XXX: GCC */ 1171 memset(&nh32, 0, sizeof(nh32)); 1172 memset(&nh64, 0, sizeof(nh64)); 1173 1174 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1175 offset += xnh_sizeof; 1176 1177 namesz = xnh_namesz; 1178 descsz = xnh_descsz; 1179 1180 if ((namesz == 0) && (descsz == 0)) { 1181 /* 1182 * We're out of note headers. 1183 */ 1184 return (offset >= size) ? offset : size; 1185 } 1186 1187 if (namesz & 0x80000000) { 1188 if (file_printf(ms, ", bad note name size %#lx", 1189 CAST(unsigned long, namesz)) == -1) 1190 return -1; 1191 return 0; 1192 } 1193 1194 if (descsz & 0x80000000) { 1195 if (file_printf(ms, ", bad note description size %#lx", 1196 CAST(unsigned long, descsz)) == -1) 1197 return -1; 1198 return 0; 1199 } 1200 1201 noff = offset; 1202 doff = ELF_ALIGN(offset + namesz); 1203 1204 if (offset + namesz > size) { 1205 /* 1206 * We're past the end of the buffer. 1207 */ 1208 return doff; 1209 } 1210 1211 offset = ELF_ALIGN(doff + descsz); 1212 if (doff + descsz > size) { 1213 /* 1214 * We're past the end of the buffer. 1215 */ 1216 return (offset >= size) ? offset : size; 1217 } 1218 1219 1220 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1221 if (do_os_note(ms, nbuf, xnh_type, swap, 1222 namesz, descsz, noff, doff, flags)) 1223 return offset; 1224 } 1225 1226 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1227 if (do_bid_note(ms, nbuf, xnh_type, swap, 1228 namesz, descsz, noff, doff, flags)) 1229 return offset; 1230 } 1231 1232 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1233 if (do_pax_note(ms, nbuf, xnh_type, swap, 1234 namesz, descsz, noff, doff, flags)) 1235 return offset; 1236 } 1237 1238 if ((*flags & FLAGS_DID_CORE) == 0) { 1239 if (do_core_note(ms, nbuf, xnh_type, swap, 1240 namesz, descsz, noff, doff, flags, size, clazz)) 1241 return offset; 1242 } 1243 1244 if ((*flags & FLAGS_DID_AUXV) == 0) { 1245 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1246 namesz, descsz, noff, doff, flags, size, clazz, 1247 fd, ph_off, ph_num, fsize)) 1248 return offset; 1249 } 1250 1251 if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) { 1252 int descw, flag; 1253 const char *str, *tag; 1254 if (descsz > 100) 1255 descsz = 100; 1256 switch (xnh_type) { 1257 case NT_NETBSD_VERSION: 1258 return offset; 1259 case NT_NETBSD_MARCH: 1260 flag = FLAGS_DID_NETBSD_MARCH; 1261 tag = "compiled for"; 1262 break; 1263 case NT_NETBSD_CMODEL: 1264 flag = FLAGS_DID_NETBSD_CMODEL; 1265 tag = "compiler model"; 1266 break; 1267 case NT_NETBSD_EMULATION: 1268 flag = FLAGS_DID_NETBSD_EMULATION; 1269 tag = "emulation:"; 1270 break; 1271 default: 1272 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1273 return offset; 1274 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1275 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1276 return offset; 1277 return offset; 1278 } 1279 1280 if (*flags & flag) 1281 return offset; 1282 str = RCAST(const char *, &nbuf[doff]); 1283 descw = CAST(int, descsz); 1284 *flags |= flag; 1285 file_printf(ms, ", %s: %s", tag, 1286 file_copystr(buf, sizeof(buf), descw, str)); 1287 return offset; 1288 } 1289 1290 return offset; 1291 } 1292 1293 /* SunOS 5.x hardware capability descriptions */ 1294 typedef struct cap_desc { 1295 uint64_t cd_mask; 1296 const char *cd_name; 1297 } cap_desc_t; 1298 1299 static const cap_desc_t cap_desc_sparc[] = { 1300 { AV_SPARC_MUL32, "MUL32" }, 1301 { AV_SPARC_DIV32, "DIV32" }, 1302 { AV_SPARC_FSMULD, "FSMULD" }, 1303 { AV_SPARC_V8PLUS, "V8PLUS" }, 1304 { AV_SPARC_POPC, "POPC" }, 1305 { AV_SPARC_VIS, "VIS" }, 1306 { AV_SPARC_VIS2, "VIS2" }, 1307 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1308 { AV_SPARC_FMAF, "FMAF" }, 1309 { AV_SPARC_FJFMAU, "FJFMAU" }, 1310 { AV_SPARC_IMA, "IMA" }, 1311 { 0, NULL } 1312 }; 1313 1314 static const cap_desc_t cap_desc_386[] = { 1315 { AV_386_FPU, "FPU" }, 1316 { AV_386_TSC, "TSC" }, 1317 { AV_386_CX8, "CX8" }, 1318 { AV_386_SEP, "SEP" }, 1319 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1320 { AV_386_CMOV, "CMOV" }, 1321 { AV_386_MMX, "MMX" }, 1322 { AV_386_AMD_MMX, "AMD_MMX" }, 1323 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1324 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1325 { AV_386_FXSR, "FXSR" }, 1326 { AV_386_SSE, "SSE" }, 1327 { AV_386_SSE2, "SSE2" }, 1328 { AV_386_PAUSE, "PAUSE" }, 1329 { AV_386_SSE3, "SSE3" }, 1330 { AV_386_MON, "MON" }, 1331 { AV_386_CX16, "CX16" }, 1332 { AV_386_AHF, "AHF" }, 1333 { AV_386_TSCP, "TSCP" }, 1334 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1335 { AV_386_POPCNT, "POPCNT" }, 1336 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1337 { AV_386_SSSE3, "SSSE3" }, 1338 { AV_386_SSE4_1, "SSE4.1" }, 1339 { AV_386_SSE4_2, "SSE4.2" }, 1340 { 0, NULL } 1341 }; 1342 1343 private int 1344 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1345 size_t size, off_t fsize, int mach, int strtab, int *flags, 1346 uint16_t *notecount) 1347 { 1348 Elf32_Shdr sh32; 1349 Elf64_Shdr sh64; 1350 int stripped = 1, has_debug_info = 0; 1351 size_t nbadcap = 0; 1352 void *nbuf; 1353 off_t noff, coff, name_off, offs; 1354 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ 1355 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ 1356 char name[50]; 1357 ssize_t namesize; 1358 1359 if (ms->flags & MAGIC_MIME) 1360 return 0; 1361 1362 if (num == 0) { 1363 if (file_printf(ms, ", no section header") == -1) 1364 return -1; 1365 return 0; 1366 } 1367 if (size != xsh_sizeof) { 1368 if (file_printf(ms, ", corrupted section header size") == -1) 1369 return -1; 1370 return 0; 1371 } 1372 1373 /* Read offset of name section to be able to read section names later */ 1374 offs = CAST(off_t, (off + size * strtab)); 1375 if (pread(fd, xsh_addr, xsh_sizeof, offs) < CAST(ssize_t, xsh_sizeof)) { 1376 if (file_printf(ms, ", missing section headers at %jd", 1377 (intmax_t)offs) == -1) 1378 return -1; 1379 return 0; 1380 } 1381 name_off = xsh_offset; 1382 1383 if (fsize != SIZE_UNKNOWN && fsize < name_off) { 1384 if (file_printf(ms, ", too large section header offset %jd", 1385 (intmax_t)name_off) == -1) 1386 return -1; 1387 return 0; 1388 } 1389 1390 for ( ; num; num--) { 1391 /* Read the name of this section. */ 1392 offs = name_off + xsh_name; 1393 if ((namesize = pread(fd, name, sizeof(name) - 1, offs)) 1394 == -1) { 1395 if (file_printf(ms, 1396 ", can't read name of elf section at %jd", 1397 (intmax_t)offs) == -1) 1398 return -1; 1399 return 0; 1400 } 1401 name[namesize] = '\0'; 1402 if (strcmp(name, ".debug_info") == 0) { 1403 has_debug_info = 1; 1404 stripped = 0; 1405 } 1406 1407 if (pread(fd, xsh_addr, xsh_sizeof, off) < 1408 CAST(ssize_t, xsh_sizeof)) { 1409 if (file_printf(ms, ", can't read elf section at %jd", 1410 (intmax_t)off) == -1) 1411 return -1; 1412 return 0; 1413 } 1414 off += size; 1415 1416 /* Things we can determine before we seek */ 1417 switch (xsh_type) { 1418 case SHT_SYMTAB: 1419 #if 0 1420 case SHT_DYNSYM: 1421 #endif 1422 stripped = 0; 1423 break; 1424 default: 1425 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1426 /* Perhaps warn here */ 1427 continue; 1428 } 1429 break; 1430 } 1431 1432 1433 /* Things we can determine when we seek */ 1434 switch (xsh_type) { 1435 case SHT_NOTE: 1436 if (CAST(uintmax_t, (xsh_size + xsh_offset)) > 1437 CAST(uintmax_t, fsize)) { 1438 if (file_printf(ms, 1439 ", note offset/size %#" INTMAX_T_FORMAT 1440 "x+%#" INTMAX_T_FORMAT "x exceeds" 1441 " file size %#" INTMAX_T_FORMAT "x", 1442 CAST(uintmax_t, xsh_offset), 1443 CAST(uintmax_t, xsh_size), 1444 CAST(uintmax_t, fsize)) == -1) 1445 return -1; 1446 return 0; 1447 } 1448 if ((nbuf = malloc(xsh_size)) == NULL) { 1449 file_error(ms, errno, "Cannot allocate memory" 1450 " for note"); 1451 return -1; 1452 } 1453 offs = xsh_offset; 1454 if (pread(fd, nbuf, xsh_size, offs) < 1455 CAST(ssize_t, xsh_size)) { 1456 free(nbuf); 1457 if (file_printf(ms, 1458 ", can't read elf note at %jd", 1459 (intmax_t)offs) == -1) 1460 return -1; 1461 return 0; 1462 } 1463 1464 noff = 0; 1465 for (;;) { 1466 if (noff >= CAST(off_t, xsh_size)) 1467 break; 1468 noff = donote(ms, nbuf, CAST(size_t, noff), 1469 xsh_size, clazz, swap, 4, flags, notecount, 1470 fd, 0, 0, 0); 1471 if (noff == 0) 1472 break; 1473 } 1474 free(nbuf); 1475 break; 1476 case SHT_SUNW_cap: 1477 switch (mach) { 1478 case EM_SPARC: 1479 case EM_SPARCV9: 1480 case EM_IA_64: 1481 case EM_386: 1482 case EM_AMD64: 1483 break; 1484 default: 1485 goto skip; 1486 } 1487 1488 if (nbadcap > 5) 1489 break; 1490 if (lseek(fd, xsh_offset, SEEK_SET) 1491 == CAST(off_t, -1)) { 1492 file_badseek(ms); 1493 return -1; 1494 } 1495 coff = 0; 1496 for (;;) { 1497 Elf32_Cap cap32; 1498 Elf64_Cap cap64; 1499 char cbuf[/*CONSTCOND*/ 1500 MAX(sizeof(cap32), sizeof(cap64))]; 1501 if ((coff += xcap_sizeof) > 1502 CAST(off_t, xsh_size)) 1503 break; 1504 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) != 1505 CAST(ssize_t, xcap_sizeof)) { 1506 file_badread(ms); 1507 return -1; 1508 } 1509 if (cbuf[0] == 'A') { 1510 #ifdef notyet 1511 char *p = cbuf + 1; 1512 uint32_t len, tag; 1513 memcpy(&len, p, sizeof(len)); 1514 p += 4; 1515 len = getu32(swap, len); 1516 if (memcmp("gnu", p, 3) != 0) { 1517 if (file_printf(ms, 1518 ", unknown capability %.3s", p) 1519 == -1) 1520 return -1; 1521 break; 1522 } 1523 p += strlen(p) + 1; 1524 tag = *p++; 1525 memcpy(&len, p, sizeof(len)); 1526 p += 4; 1527 len = getu32(swap, len); 1528 if (tag != 1) { 1529 if (file_printf(ms, ", unknown gnu" 1530 " capability tag %d", tag) 1531 == -1) 1532 return -1; 1533 break; 1534 } 1535 // gnu attributes 1536 #endif 1537 break; 1538 } 1539 memcpy(xcap_addr, cbuf, xcap_sizeof); 1540 switch (xcap_tag) { 1541 case CA_SUNW_NULL: 1542 break; 1543 case CA_SUNW_HW_1: 1544 cap_hw1 |= xcap_val; 1545 break; 1546 case CA_SUNW_SF_1: 1547 cap_sf1 |= xcap_val; 1548 break; 1549 default: 1550 if (file_printf(ms, 1551 ", with unknown capability " 1552 "%#" INT64_T_FORMAT "x = %#" 1553 INT64_T_FORMAT "x", 1554 CAST(unsigned long long, xcap_tag), 1555 CAST(unsigned long long, xcap_val)) 1556 == -1) 1557 return -1; 1558 if (nbadcap++ > 2) 1559 coff = xsh_size; 1560 break; 1561 } 1562 } 1563 /*FALLTHROUGH*/ 1564 skip: 1565 default: 1566 break; 1567 } 1568 } 1569 1570 if (has_debug_info) { 1571 if (file_printf(ms, ", with debug_info") == -1) 1572 return -1; 1573 } 1574 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1575 return -1; 1576 if (cap_hw1) { 1577 const cap_desc_t *cdp; 1578 switch (mach) { 1579 case EM_SPARC: 1580 case EM_SPARC32PLUS: 1581 case EM_SPARCV9: 1582 cdp = cap_desc_sparc; 1583 break; 1584 case EM_386: 1585 case EM_IA_64: 1586 case EM_AMD64: 1587 cdp = cap_desc_386; 1588 break; 1589 default: 1590 cdp = NULL; 1591 break; 1592 } 1593 if (file_printf(ms, ", uses") == -1) 1594 return -1; 1595 if (cdp) { 1596 while (cdp->cd_name) { 1597 if (cap_hw1 & cdp->cd_mask) { 1598 if (file_printf(ms, 1599 " %s", cdp->cd_name) == -1) 1600 return -1; 1601 cap_hw1 &= ~cdp->cd_mask; 1602 } 1603 ++cdp; 1604 } 1605 if (cap_hw1) 1606 if (file_printf(ms, 1607 " unknown hardware capability %#" 1608 INT64_T_FORMAT "x", 1609 CAST(unsigned long long, cap_hw1)) == -1) 1610 return -1; 1611 } else { 1612 if (file_printf(ms, 1613 " hardware capability %#" INT64_T_FORMAT "x", 1614 CAST(unsigned long long, cap_hw1)) == -1) 1615 return -1; 1616 } 1617 } 1618 if (cap_sf1) { 1619 if (cap_sf1 & SF1_SUNW_FPUSED) { 1620 if (file_printf(ms, 1621 (cap_sf1 & SF1_SUNW_FPKNWN) 1622 ? ", uses frame pointer" 1623 : ", not known to use frame pointer") == -1) 1624 return -1; 1625 } 1626 cap_sf1 &= ~SF1_SUNW_MASK; 1627 if (cap_sf1) 1628 if (file_printf(ms, 1629 ", with unknown software capability %#" 1630 INT64_T_FORMAT "x", 1631 CAST(unsigned long long, cap_sf1)) == -1) 1632 return -1; 1633 } 1634 return 0; 1635 } 1636 1637 /* 1638 * Look through the program headers of an executable image, to determine 1639 * if it is statically or dynamically linked. If it has a dynamic section, 1640 * it is pie, and does not have an interpreter or needed libraries, we 1641 * call it static pie. 1642 */ 1643 private int 1644 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1645 int num, size_t size, off_t fsize, int sh_num, int *flags, 1646 uint16_t *notecount) 1647 { 1648 Elf32_Phdr ph32; 1649 Elf64_Phdr ph64; 1650 const char *linking_style; 1651 unsigned char nbuf[BUFSIZ]; 1652 char ibuf[BUFSIZ]; 1653 char interp[BUFSIZ]; 1654 ssize_t bufsize; 1655 size_t offset, align, len, need = 0; 1656 int pie = 0, dynamic = 0; 1657 1658 if (num == 0) { 1659 if (file_printf(ms, ", no program header") == -1) 1660 return -1; 1661 return 0; 1662 } 1663 if (size != xph_sizeof) { 1664 if (file_printf(ms, ", corrupted program header size") == -1) 1665 return -1; 1666 return 0; 1667 } 1668 1669 interp[0] = '\0'; 1670 for ( ; num; num--) { 1671 int doread; 1672 if (pread(fd, xph_addr, xph_sizeof, off) < 1673 CAST(ssize_t, xph_sizeof)) { 1674 if (file_printf(ms, 1675 ", can't read elf program headers at %jd", 1676 (intmax_t)off) == -1) 1677 return -1; 1678 return 0; 1679 } 1680 1681 off += size; 1682 bufsize = 0; 1683 align = 4; 1684 1685 /* Things we can determine before we seek */ 1686 switch (xph_type) { 1687 case PT_DYNAMIC: 1688 doread = 1; 1689 break; 1690 case PT_NOTE: 1691 if (sh_num) /* Did this through section headers */ 1692 continue; 1693 if (((align = xph_align) & 0x80000000UL) != 0 || 1694 align < 4) { 1695 if (file_printf(ms, 1696 ", invalid note alignment %#lx", 1697 CAST(unsigned long, align)) == -1) 1698 return -1; 1699 align = 4; 1700 } 1701 /*FALLTHROUGH*/ 1702 case PT_INTERP: 1703 doread = 1; 1704 break; 1705 default: 1706 doread = 0; 1707 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1708 /* Maybe warn here? */ 1709 continue; 1710 } 1711 break; 1712 } 1713 1714 if (doread) { 1715 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1716 : sizeof(nbuf); 1717 off_t offs = xph_offset; 1718 bufsize = pread(fd, nbuf, len, offs); 1719 if (bufsize == -1) { 1720 if (file_printf(ms, 1721 ", can't read section at %jd", 1722 (intmax_t)offs) == -1) 1723 return -1; 1724 return 0; 1725 } 1726 } else 1727 len = 0; 1728 1729 /* Things we can determine when we seek */ 1730 switch (xph_type) { 1731 case PT_DYNAMIC: 1732 dynamic = 1; 1733 offset = 0; 1734 // Let DF_1 determine if we are PIE or not. 1735 ms->mode &= ~0111; 1736 for (;;) { 1737 if (offset >= CAST(size_t, bufsize)) 1738 break; 1739 offset = dodynamic(ms, nbuf, offset, 1740 CAST(size_t, bufsize), clazz, swap, 1741 &pie, &need); 1742 if (offset == 0) 1743 break; 1744 } 1745 if (ms->flags & MAGIC_MIME) 1746 continue; 1747 break; 1748 1749 case PT_INTERP: 1750 need++; 1751 if (ms->flags & MAGIC_MIME) 1752 continue; 1753 if (bufsize && nbuf[0]) { 1754 nbuf[bufsize - 1] = '\0'; 1755 memcpy(interp, nbuf, CAST(size_t, bufsize)); 1756 } else 1757 strlcpy(interp, "*empty*", sizeof(interp)); 1758 break; 1759 case PT_NOTE: 1760 if (ms->flags & MAGIC_MIME) 1761 return 0; 1762 /* 1763 * This is a PT_NOTE section; loop through all the notes 1764 * in the section. 1765 */ 1766 offset = 0; 1767 for (;;) { 1768 if (offset >= CAST(size_t, bufsize)) 1769 break; 1770 offset = donote(ms, nbuf, offset, 1771 CAST(size_t, bufsize), clazz, swap, align, 1772 flags, notecount, fd, 0, 0, 0); 1773 if (offset == 0) 1774 break; 1775 } 1776 break; 1777 default: 1778 if (ms->flags & MAGIC_MIME) 1779 continue; 1780 break; 1781 } 1782 } 1783 if (ms->flags & MAGIC_MIME) 1784 return 0; 1785 if (dynamic) { 1786 if (pie && need == 0) 1787 linking_style = "static-pie"; 1788 else 1789 linking_style = "dynamically"; 1790 } else { 1791 linking_style = "statically"; 1792 } 1793 if (file_printf(ms, ", %s linked", linking_style) == -1) 1794 return -1; 1795 if (interp[0]) 1796 if (file_printf(ms, ", interpreter %s", 1797 file_printable(ibuf, sizeof(ibuf), interp, sizeof(interp))) 1798 == -1) 1799 return -1; 1800 return 0; 1801 } 1802 1803 1804 protected int 1805 file_tryelf(struct magic_set *ms, const struct buffer *b) 1806 { 1807 int fd = b->fd; 1808 const unsigned char *buf = CAST(const unsigned char *, b->fbuf); 1809 size_t nbytes = b->flen; 1810 union { 1811 int32_t l; 1812 char c[sizeof(int32_t)]; 1813 } u; 1814 int clazz; 1815 int swap; 1816 struct stat st; 1817 const struct stat *stp; 1818 off_t fsize; 1819 int flags = 0; 1820 Elf32_Ehdr elf32hdr; 1821 Elf64_Ehdr elf64hdr; 1822 uint16_t type, phnum, shnum, notecount; 1823 1824 if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION)) 1825 return 0; 1826 /* 1827 * ELF executables have multiple section headers in arbitrary 1828 * file locations and thus file(1) cannot determine it from easily. 1829 * Instead we traverse thru all section headers until a symbol table 1830 * one is found or else the binary is stripped. 1831 * Return immediately if it's not ELF (so we avoid pipe2file unless 1832 * needed). 1833 */ 1834 if (buf[EI_MAG0] != ELFMAG0 1835 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1836 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1837 return 0; 1838 1839 /* 1840 * If we cannot seek, it must be a pipe, socket or fifo. 1841 */ 1842 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) 1843 && (errno == ESPIPE)) 1844 fd = file_pipe2file(ms, fd, buf, nbytes); 1845 1846 if (fd == -1) { 1847 file_badread(ms); 1848 return -1; 1849 } 1850 1851 stp = &b->st; 1852 /* 1853 * b->st.st_size != 0 if previous fstat() succeeded, 1854 * which is likely, we can avoid extra stat() call. 1855 */ 1856 if (b->st.st_size == 0) { 1857 stp = &st; 1858 if (fstat(fd, &st) == -1) { 1859 file_badread(ms); 1860 return -1; 1861 } 1862 } 1863 if (S_ISREG(stp->st_mode) || stp->st_size != 0) 1864 fsize = stp->st_size; 1865 else 1866 fsize = SIZE_UNKNOWN; 1867 1868 clazz = buf[EI_CLASS]; 1869 1870 switch (clazz) { 1871 case ELFCLASS32: 1872 #undef elf_getu 1873 #define elf_getu(a, b) elf_getu32(a, b) 1874 #undef elfhdr 1875 #define elfhdr elf32hdr 1876 #include "elfclass.h" 1877 case ELFCLASS64: 1878 #undef elf_getu 1879 #define elf_getu(a, b) elf_getu64(a, b) 1880 #undef elfhdr 1881 #define elfhdr elf64hdr 1882 #include "elfclass.h" 1883 default: 1884 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1885 return -1; 1886 break; 1887 } 1888 return 0; 1889 } 1890 #endif 1891