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 1.168 2019/12/16 03:49:19 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 (file_printf(ms, ", too many %s (%u)", name, num) == -1) 71 return -1; 72 return 1; 73 } 74 75 private uint16_t 76 getu16(int swap, uint16_t value) 77 { 78 union { 79 uint16_t ui; 80 char c[2]; 81 } retval, tmpval; 82 83 if (swap) { 84 tmpval.ui = value; 85 86 retval.c[0] = tmpval.c[1]; 87 retval.c[1] = tmpval.c[0]; 88 89 return retval.ui; 90 } else 91 return value; 92 } 93 94 private uint32_t 95 getu32(int swap, uint32_t value) 96 { 97 union { 98 uint32_t ui; 99 char c[4]; 100 } retval, tmpval; 101 102 if (swap) { 103 tmpval.ui = value; 104 105 retval.c[0] = tmpval.c[3]; 106 retval.c[1] = tmpval.c[2]; 107 retval.c[2] = tmpval.c[1]; 108 retval.c[3] = tmpval.c[0]; 109 110 return retval.ui; 111 } else 112 return value; 113 } 114 115 private uint64_t 116 getu64(int swap, uint64_t value) 117 { 118 union { 119 uint64_t ui; 120 char c[8]; 121 } retval, tmpval; 122 123 if (swap) { 124 tmpval.ui = value; 125 126 retval.c[0] = tmpval.c[7]; 127 retval.c[1] = tmpval.c[6]; 128 retval.c[2] = tmpval.c[5]; 129 retval.c[3] = tmpval.c[4]; 130 retval.c[4] = tmpval.c[3]; 131 retval.c[5] = tmpval.c[2]; 132 retval.c[6] = tmpval.c[1]; 133 retval.c[7] = tmpval.c[0]; 134 135 return retval.ui; 136 } else 137 return value; 138 } 139 140 #define elf_getu16(swap, value) getu16(swap, value) 141 #define elf_getu32(swap, value) getu32(swap, value) 142 #define elf_getu64(swap, value) getu64(swap, value) 143 144 #define xsh_addr (clazz == ELFCLASS32 \ 145 ? CAST(void *, &sh32) \ 146 : CAST(void *, &sh64)) 147 #define xsh_sizeof (clazz == ELFCLASS32 \ 148 ? sizeof(sh32) \ 149 : sizeof(sh64)) 150 #define xsh_size CAST(size_t, (clazz == ELFCLASS32 \ 151 ? elf_getu32(swap, sh32.sh_size) \ 152 : elf_getu64(swap, sh64.sh_size))) 153 #define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \ 154 ? elf_getu32(swap, sh32.sh_offset) \ 155 : elf_getu64(swap, sh64.sh_offset))) 156 #define xsh_type (clazz == ELFCLASS32 \ 157 ? elf_getu32(swap, sh32.sh_type) \ 158 : elf_getu32(swap, sh64.sh_type)) 159 #define xsh_name (clazz == ELFCLASS32 \ 160 ? elf_getu32(swap, sh32.sh_name) \ 161 : elf_getu32(swap, sh64.sh_name)) 162 163 #define xph_addr (clazz == ELFCLASS32 \ 164 ? CAST(void *, &ph32) \ 165 : CAST(void *, &ph64)) 166 #define xph_sizeof (clazz == ELFCLASS32 \ 167 ? sizeof(ph32) \ 168 : sizeof(ph64)) 169 #define xph_type (clazz == ELFCLASS32 \ 170 ? elf_getu32(swap, ph32.p_type) \ 171 : elf_getu32(swap, ph64.p_type)) 172 #define xph_offset CAST(off_t, (clazz == ELFCLASS32 \ 173 ? elf_getu32(swap, ph32.p_offset) \ 174 : elf_getu64(swap, ph64.p_offset))) 175 #define xph_align CAST(size_t, (clazz == ELFCLASS32 \ 176 ? CAST(off_t, (ph32.p_align ? \ 177 elf_getu32(swap, ph32.p_align) : 4))\ 178 : CAST(off_t, (ph64.p_align ? \ 179 elf_getu64(swap, ph64.p_align) : 4)))) 180 #define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \ 181 ? CAST(off_t, (ph32.p_vaddr ? \ 182 elf_getu32(swap, ph32.p_vaddr) : 4))\ 183 : CAST(off_t, (ph64.p_vaddr ? \ 184 elf_getu64(swap, ph64.p_vaddr) : 4)))) 185 #define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \ 186 ? elf_getu32(swap, ph32.p_filesz) \ 187 : elf_getu64(swap, ph64.p_filesz))) 188 #define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \ 189 ? elf_getu32(swap, ph32.p_memsz) \ 190 : elf_getu64(swap, ph64.p_memsz)))) 191 #define xnh_addr (clazz == ELFCLASS32 \ 192 ? CAST(void *, &nh32) \ 193 : CAST(void *, &nh64)) 194 #define xnh_sizeof (clazz == ELFCLASS32 \ 195 ? sizeof(nh32) \ 196 : sizeof(nh64)) 197 #define xnh_type (clazz == ELFCLASS32 \ 198 ? elf_getu32(swap, nh32.n_type) \ 199 : elf_getu32(swap, nh64.n_type)) 200 #define xnh_namesz (clazz == ELFCLASS32 \ 201 ? elf_getu32(swap, nh32.n_namesz) \ 202 : elf_getu32(swap, nh64.n_namesz)) 203 #define xnh_descsz (clazz == ELFCLASS32 \ 204 ? elf_getu32(swap, nh32.n_descsz) \ 205 : elf_getu32(swap, nh64.n_descsz)) 206 207 #define xdh_addr (clazz == ELFCLASS32 \ 208 ? CAST(void *, &dh32) \ 209 : CAST(void *, &dh64)) 210 #define xdh_sizeof (clazz == ELFCLASS32 \ 211 ? sizeof(dh32) \ 212 : sizeof(dh64)) 213 #define xdh_tag (clazz == ELFCLASS32 \ 214 ? elf_getu32(swap, dh32.d_tag) \ 215 : elf_getu64(swap, dh64.d_tag)) 216 #define xdh_val (clazz == ELFCLASS32 \ 217 ? elf_getu32(swap, dh32.d_un.d_val) \ 218 : elf_getu64(swap, dh64.d_un.d_val)) 219 220 #define xcap_addr (clazz == ELFCLASS32 \ 221 ? CAST(void *, &cap32) \ 222 : CAST(void *, &cap64)) 223 #define xcap_sizeof (clazz == ELFCLASS32 \ 224 ? sizeof(cap32) \ 225 : sizeof(cap64)) 226 #define xcap_tag (clazz == ELFCLASS32 \ 227 ? elf_getu32(swap, cap32.c_tag) \ 228 : elf_getu64(swap, cap64.c_tag)) 229 #define xcap_val (clazz == ELFCLASS32 \ 230 ? elf_getu32(swap, cap32.c_un.c_val) \ 231 : elf_getu64(swap, cap64.c_un.c_val)) 232 233 #define xauxv_addr (clazz == ELFCLASS32 \ 234 ? CAST(void *, &auxv32) \ 235 : CAST(void *, &auxv64)) 236 #define xauxv_sizeof (clazz == ELFCLASS32 \ 237 ? sizeof(auxv32) \ 238 : sizeof(auxv64)) 239 #define xauxv_type (clazz == ELFCLASS32 \ 240 ? elf_getu32(swap, auxv32.a_type) \ 241 : elf_getu64(swap, auxv64.a_type)) 242 #define xauxv_val (clazz == ELFCLASS32 \ 243 ? elf_getu32(swap, auxv32.a_v) \ 244 : elf_getu64(swap, auxv64.a_v)) 245 246 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 247 ? prpsoffsets32[i] \ 248 : prpsoffsets64[i]) 249 250 #ifdef ELFCORE 251 /* 252 * Try larger offsets first to avoid false matches 253 * from earlier data that happen to look like strings. 254 */ 255 static const size_t prpsoffsets32[] = { 256 #ifdef USE_NT_PSINFO 257 104, /* SunOS 5.x (command line) */ 258 88, /* SunOS 5.x (short name) */ 259 #endif /* USE_NT_PSINFO */ 260 261 100, /* SunOS 5.x (command line) */ 262 84, /* SunOS 5.x (short name) */ 263 264 44, /* Linux (command line) */ 265 28, /* Linux (short name) */ 266 267 48, /* Linux PowerPC (command line) */ 268 32, /* Linux PowerPC (short name) */ 269 270 8, /* FreeBSD */ 271 }; 272 273 static const size_t prpsoffsets64[] = { 274 #ifdef USE_NT_PSINFO 275 152, /* SunOS 5.x (command line) */ 276 136, /* SunOS 5.x (short name) */ 277 #endif /* USE_NT_PSINFO */ 278 279 136, /* SunOS 5.x, 64-bit (command line) */ 280 120, /* SunOS 5.x, 64-bit (short name) */ 281 282 56, /* Linux (command line) */ 283 40, /* Linux (tested on core from 2.4.x, short name) */ 284 285 16, /* FreeBSD, 64-bit */ 286 }; 287 288 #define NOFFSETS32 __arraycount(prpsoffsets32) 289 #define NOFFSETS64 __arraycount(prpsoffsets64) 290 291 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 292 293 /* 294 * Look through the program headers of an executable image, searching 295 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 296 * "FreeBSD"; if one is found, try looking in various places in its 297 * contents for a 16-character string containing only printable 298 * characters - if found, that string should be the name of the program 299 * that dropped core. Note: right after that 16-character string is, 300 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 301 * Linux, a longer string (80 characters, in 5.x, probably other 302 * SVR4-flavored systems, and Linux) containing the start of the 303 * command line for that program. 304 * 305 * SunOS 5.x core files contain two PT_NOTE sections, with the types 306 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 307 * same info about the command name and command line, so it probably 308 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 309 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 310 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 311 * the SunOS 5.x file command relies on this (and prefers the latter). 312 * 313 * The signal number probably appears in a section of type NT_PRSTATUS, 314 * but that's also rather OS-dependent, in ways that are harder to 315 * dissect with heuristics, so I'm not bothering with the signal number. 316 * (I suppose the signal number could be of interest in situations where 317 * you don't have the binary of the program that dropped core; if you 318 * *do* have that binary, the debugger will probably tell you what 319 * signal it was.) 320 */ 321 322 #define OS_STYLE_SVR4 0 323 #define OS_STYLE_FREEBSD 1 324 #define OS_STYLE_NETBSD 2 325 326 private const char os_style_names[][8] = { 327 "SVR4", 328 "FreeBSD", 329 "NetBSD", 330 }; 331 332 #define FLAGS_CORE_STYLE 0x0003 333 334 #define FLAGS_DID_CORE 0x0004 335 #define FLAGS_DID_OS_NOTE 0x0008 336 #define FLAGS_DID_BUILD_ID 0x0010 337 #define FLAGS_DID_CORE_STYLE 0x0020 338 #define FLAGS_DID_NETBSD_PAX 0x0040 339 #define FLAGS_DID_NETBSD_MARCH 0x0080 340 #define FLAGS_DID_NETBSD_CMODEL 0x0100 341 #define FLAGS_DID_NETBSD_EMULATION 0x0200 342 #define FLAGS_DID_NETBSD_UNKNOWN 0x0400 343 #define FLAGS_IS_CORE 0x0800 344 #define FLAGS_DID_AUXV 0x1000 345 346 private int 347 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 348 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 349 { 350 Elf32_Phdr ph32; 351 Elf64_Phdr ph64; 352 size_t offset, len; 353 unsigned char nbuf[BUFSIZ]; 354 ssize_t bufsize; 355 off_t ph_off = off; 356 int ph_num = num; 357 358 if (num == 0) { 359 if (file_printf(ms, ", no program header") == -1) 360 return -1; 361 return 0; 362 } 363 if (size != xph_sizeof) { 364 if (file_printf(ms, ", corrupted program header size") == -1) 365 return -1; 366 return 0; 367 } 368 369 /* 370 * Loop through all the program headers. 371 */ 372 for ( ; num; num--) { 373 if (pread(fd, xph_addr, xph_sizeof, off) < 374 CAST(ssize_t, xph_sizeof)) { 375 file_badread(ms); 376 return -1; 377 } 378 off += size; 379 380 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 381 /* Perhaps warn here */ 382 continue; 383 } 384 385 if (xph_type != PT_NOTE) 386 continue; 387 388 /* 389 * This is a PT_NOTE section; loop through all the notes 390 * in the section. 391 */ 392 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 393 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) { 394 file_badread(ms); 395 return -1; 396 } 397 offset = 0; 398 for (;;) { 399 if (offset >= CAST(size_t, bufsize)) 400 break; 401 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize), 402 clazz, swap, 4, flags, notecount, fd, ph_off, 403 ph_num, fsize); 404 if (offset == 0) 405 break; 406 407 } 408 } 409 return 0; 410 } 411 #endif 412 413 static int 414 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 415 { 416 uint32_t desc; 417 memcpy(&desc, v, sizeof(desc)); 418 desc = elf_getu32(swap, desc); 419 420 if (file_printf(ms, ", for NetBSD") == -1) 421 return -1; 422 /* 423 * The version number used to be stuck as 199905, and was thus 424 * basically content-free. Newer versions of NetBSD have fixed 425 * this and now use the encoding of __NetBSD_Version__: 426 * 427 * MMmmrrpp00 428 * 429 * M = major version 430 * m = minor version 431 * r = release ["",A-Z,Z[A-Z] but numeric] 432 * p = patchlevel 433 */ 434 if (desc > 100000000U) { 435 uint32_t ver_patch = (desc / 100) % 100; 436 uint32_t ver_rel = (desc / 10000) % 100; 437 uint32_t ver_min = (desc / 1000000) % 100; 438 uint32_t ver_maj = desc / 100000000; 439 440 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 441 return -1; 442 if (ver_rel == 0 && ver_patch != 0) { 443 if (file_printf(ms, ".%u", ver_patch) == -1) 444 return -1; 445 } else if (ver_rel != 0) { 446 while (ver_rel > 26) { 447 if (file_printf(ms, "Z") == -1) 448 return -1; 449 ver_rel -= 26; 450 } 451 if (file_printf(ms, "%c", 'A' + ver_rel - 1) 452 == -1) 453 return -1; 454 } 455 } 456 return 0; 457 } 458 459 static int 460 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 461 { 462 uint32_t desc; 463 464 memcpy(&desc, v, sizeof(desc)); 465 desc = elf_getu32(swap, desc); 466 if (file_printf(ms, ", for FreeBSD") == -1) 467 return -1; 468 469 /* 470 * Contents is __FreeBSD_version, whose relation to OS 471 * versions is defined by a huge table in the Porter's 472 * Handbook. This is the general scheme: 473 * 474 * Releases: 475 * Mmp000 (before 4.10) 476 * Mmi0p0 (before 5.0) 477 * Mmm0p0 478 * 479 * Development branches: 480 * Mmpxxx (before 4.6) 481 * Mmp1xx (before 4.10) 482 * Mmi1xx (before 5.0) 483 * M000xx (pre-M.0) 484 * Mmm1xx 485 * 486 * M = major version 487 * m = minor version 488 * i = minor version increment (491000 -> 4.10) 489 * p = patchlevel 490 * x = revision 491 * 492 * The first release of FreeBSD to use ELF by default 493 * was version 3.0. 494 */ 495 if (desc == 460002) { 496 if (file_printf(ms, " 4.6.2") == -1) 497 return -1; 498 } else if (desc < 460100) { 499 if (file_printf(ms, " %d.%d", desc / 100000, 500 desc / 10000 % 10) == -1) 501 return -1; 502 if (desc / 1000 % 10 > 0) 503 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) 504 return -1; 505 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 506 if (file_printf(ms, " (%d)", desc) == -1) 507 return -1; 508 } else if (desc < 500000) { 509 if (file_printf(ms, " %d.%d", desc / 100000, 510 desc / 10000 % 10 + desc / 1000 % 10) == -1) 511 return -1; 512 if (desc / 100 % 10 > 0) { 513 if (file_printf(ms, " (%d)", desc) == -1) 514 return -1; 515 } else if (desc / 10 % 10 > 0) { 516 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 517 return -1; 518 } 519 } else { 520 if (file_printf(ms, " %d.%d", desc / 100000, 521 desc / 1000 % 100) == -1) 522 return -1; 523 if ((desc / 100 % 10 > 0) || 524 (desc % 100000 / 100 == 0)) { 525 if (file_printf(ms, " (%d)", desc) == -1) 526 return -1; 527 } else if (desc / 10 % 10 > 0) { 528 if (file_printf(ms, ".%d", desc / 10 % 10) == -1) 529 return -1; 530 } 531 } 532 return 0; 533 } 534 535 private int 536 /*ARGSUSED*/ 537 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 538 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 539 size_t noff, size_t doff, int *flags) 540 { 541 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 && 542 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) { 543 uint8_t desc[20]; 544 const char *btype; 545 uint32_t i; 546 *flags |= FLAGS_DID_BUILD_ID; 547 switch (descsz) { 548 case 8: 549 btype = "xxHash"; 550 break; 551 case 16: 552 btype = "md5/uuid"; 553 break; 554 case 20: 555 btype = "sha1"; 556 break; 557 default: 558 btype = "unknown"; 559 break; 560 } 561 if (file_printf(ms, ", BuildID[%s]=", btype) == -1) 562 return -1; 563 memcpy(desc, &nbuf[doff], descsz); 564 for (i = 0; i < descsz; i++) 565 if (file_printf(ms, "%02x", desc[i]) == -1) 566 return -1; 567 return 1; 568 } 569 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 && 570 type == NT_GO_BUILD_ID && descsz < 128) { 571 if (file_printf(ms, ", Go BuildID=%.*s", 572 CAST(int, descsz), RCAST(char *, &nbuf[doff])) == -1) 573 return -1; 574 return 1; 575 } 576 return 0; 577 } 578 579 private int 580 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 581 int swap, uint32_t namesz, uint32_t descsz, 582 size_t noff, size_t doff, int *flags) 583 { 584 const char *name = RCAST(const char *, &nbuf[noff]); 585 586 if (namesz == 5 && strcmp(name, "SuSE") == 0 && 587 type == NT_GNU_VERSION && descsz == 2) { 588 *flags |= FLAGS_DID_OS_NOTE; 589 if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff], 590 nbuf[doff + 1]) == -1) 591 return -1; 592 return 1; 593 } 594 595 if (namesz == 4 && strcmp(name, "GNU") == 0 && 596 type == NT_GNU_VERSION && descsz == 16) { 597 uint32_t desc[4]; 598 memcpy(desc, &nbuf[doff], sizeof(desc)); 599 600 *flags |= FLAGS_DID_OS_NOTE; 601 if (file_printf(ms, ", for GNU/") == -1) 602 return -1; 603 switch (elf_getu32(swap, desc[0])) { 604 case GNU_OS_LINUX: 605 if (file_printf(ms, "Linux") == -1) 606 return -1; 607 break; 608 case GNU_OS_HURD: 609 if (file_printf(ms, "Hurd") == -1) 610 return -1; 611 break; 612 case GNU_OS_SOLARIS: 613 if (file_printf(ms, "Solaris") == -1) 614 return -1; 615 break; 616 case GNU_OS_KFREEBSD: 617 if (file_printf(ms, "kFreeBSD") == -1) 618 return -1; 619 break; 620 case GNU_OS_KNETBSD: 621 if (file_printf(ms, "kNetBSD") == -1) 622 return -1; 623 break; 624 default: 625 if (file_printf(ms, "<unknown>") == -1) 626 return -1; 627 } 628 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 629 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 630 return -1; 631 return 1; 632 } 633 634 if (namesz == 7 && strcmp(name, "NetBSD") == 0) { 635 if (type == NT_NETBSD_VERSION && descsz == 4) { 636 *flags |= FLAGS_DID_OS_NOTE; 637 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1) 638 return -1; 639 return 1; 640 } 641 } 642 643 if (namesz == 8 && strcmp(name, "FreeBSD") == 0) { 644 if (type == NT_FREEBSD_VERSION && descsz == 4) { 645 *flags |= FLAGS_DID_OS_NOTE; 646 if (do_note_freebsd_version(ms, swap, &nbuf[doff]) 647 == -1) 648 return -1; 649 return 1; 650 } 651 } 652 653 if (namesz == 8 && strcmp(name, "OpenBSD") == 0 && 654 type == NT_OPENBSD_VERSION && descsz == 4) { 655 *flags |= FLAGS_DID_OS_NOTE; 656 if (file_printf(ms, ", for OpenBSD") == -1) 657 return -1; 658 /* Content of note is always 0 */ 659 return 1; 660 } 661 662 if (namesz == 10 && strcmp(name, "DragonFly") == 0 && 663 type == NT_DRAGONFLY_VERSION && descsz == 4) { 664 uint32_t desc; 665 *flags |= FLAGS_DID_OS_NOTE; 666 if (file_printf(ms, ", for DragonFly") == -1) 667 return -1; 668 memcpy(&desc, &nbuf[doff], sizeof(desc)); 669 desc = elf_getu32(swap, desc); 670 if (file_printf(ms, " %d.%d.%d", desc / 100000, 671 desc / 10000 % 10, desc % 10000) == -1) 672 return -1; 673 return 1; 674 } 675 return 0; 676 } 677 678 private int 679 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 680 int swap, uint32_t namesz, uint32_t descsz, 681 size_t noff, size_t doff, int *flags) 682 { 683 const char *name = RCAST(const char *, &nbuf[noff]); 684 685 if (namesz == 4 && strcmp(name, "PaX") == 0 && 686 type == NT_NETBSD_PAX && descsz == 4) { 687 static const char *pax[] = { 688 "+mprotect", 689 "-mprotect", 690 "+segvguard", 691 "-segvguard", 692 "+ASLR", 693 "-ASLR", 694 }; 695 uint32_t desc; 696 size_t i; 697 int did = 0; 698 699 *flags |= FLAGS_DID_NETBSD_PAX; 700 memcpy(&desc, &nbuf[doff], sizeof(desc)); 701 desc = elf_getu32(swap, desc); 702 703 if (desc && file_printf(ms, ", PaX: ") == -1) 704 return -1; 705 706 for (i = 0; i < __arraycount(pax); i++) { 707 if (((1 << CAST(int, i)) & desc) == 0) 708 continue; 709 if (file_printf(ms, "%s%s", did++ ? "," : "", 710 pax[i]) == -1) 711 return -1; 712 } 713 return 1; 714 } 715 return 0; 716 } 717 718 private int 719 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 720 int swap, uint32_t namesz, uint32_t descsz, 721 size_t noff, size_t doff, int *flags, size_t size, int clazz) 722 { 723 #ifdef ELFCORE 724 const char *name = RCAST(const char *, &nbuf[noff]); 725 726 int os_style = -1; 727 /* 728 * Sigh. The 2.0.36 kernel in Debian 2.1, at 729 * least, doesn't correctly implement name 730 * sections, in core dumps, as specified by 731 * the "Program Linking" section of "UNIX(R) System 732 * V Release 4 Programmer's Guide: ANSI C and 733 * Programming Support Tools", because my copy 734 * clearly says "The first 'namesz' bytes in 'name' 735 * contain a *null-terminated* [emphasis mine] 736 * character representation of the entry's owner 737 * or originator", but the 2.0.36 kernel code 738 * doesn't include the terminating null in the 739 * name.... 740 */ 741 if ((namesz == 4 && strncmp(name, "CORE", 4) == 0) || 742 (namesz == 5 && strcmp(name, "CORE") == 0)) { 743 os_style = OS_STYLE_SVR4; 744 } 745 746 if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) { 747 os_style = OS_STYLE_FREEBSD; 748 } 749 750 if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11) 751 == 0)) { 752 os_style = OS_STYLE_NETBSD; 753 } 754 755 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 756 if (file_printf(ms, ", %s-style", os_style_names[os_style]) 757 == -1) 758 return -1; 759 *flags |= FLAGS_DID_CORE_STYLE; 760 *flags |= os_style; 761 } 762 763 switch (os_style) { 764 case OS_STYLE_NETBSD: 765 if (type == NT_NETBSD_CORE_PROCINFO) { 766 char sbuf[512]; 767 struct NetBSD_elfcore_procinfo pi; 768 memset(&pi, 0, sizeof(pi)); 769 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi))); 770 771 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, " 772 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)", 773 file_printable(sbuf, sizeof(sbuf), 774 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)), 775 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)), 776 elf_getu32(swap, pi.cpi_euid), 777 elf_getu32(swap, pi.cpi_egid), 778 elf_getu32(swap, pi.cpi_nlwps), 779 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)), 780 elf_getu32(swap, pi.cpi_signo), 781 elf_getu32(swap, pi.cpi_sigcode)) == -1) 782 return -1; 783 784 *flags |= FLAGS_DID_CORE; 785 return 1; 786 } 787 break; 788 789 case OS_STYLE_FREEBSD: 790 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 791 size_t argoff, pidoff; 792 793 if (clazz == ELFCLASS32) 794 argoff = 4 + 4 + 17; 795 else 796 argoff = 4 + 4 + 8 + 17; 797 if (file_printf(ms, ", from '%.80s'", nbuf + doff + 798 argoff) == -1) 799 return -1; 800 pidoff = argoff + 81 + 2; 801 if (doff + pidoff + 4 <= size) { 802 if (file_printf(ms, ", pid=%u", 803 elf_getu32(swap, *RCAST(uint32_t *, (nbuf + 804 doff + pidoff)))) == -1) 805 return -1; 806 } 807 *flags |= FLAGS_DID_CORE; 808 } 809 break; 810 811 default: 812 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 813 size_t i, j; 814 unsigned char c; 815 /* 816 * Extract the program name. We assume 817 * it to be 16 characters (that's what it 818 * is in SunOS 5.x and Linux). 819 * 820 * Unfortunately, it's at a different offset 821 * in various OSes, so try multiple offsets. 822 * If the characters aren't all printable, 823 * reject it. 824 */ 825 for (i = 0; i < NOFFSETS; i++) { 826 unsigned char *cname, *cp; 827 size_t reloffset = prpsoffsets(i); 828 size_t noffset = doff + reloffset; 829 size_t k; 830 for (j = 0; j < 16; j++, noffset++, 831 reloffset++) { 832 /* 833 * Make sure we're not past 834 * the end of the buffer; if 835 * we are, just give up. 836 */ 837 if (noffset >= size) 838 goto tryanother; 839 840 /* 841 * Make sure we're not past 842 * the end of the contents; 843 * if we are, this obviously 844 * isn't the right offset. 845 */ 846 if (reloffset >= descsz) 847 goto tryanother; 848 849 c = nbuf[noffset]; 850 if (c == '\0') { 851 /* 852 * A '\0' at the 853 * beginning is 854 * obviously wrong. 855 * Any other '\0' 856 * means we're done. 857 */ 858 if (j == 0) 859 goto tryanother; 860 else 861 break; 862 } else { 863 /* 864 * A nonprintable 865 * character is also 866 * wrong. 867 */ 868 if (!isprint(c) || isquote(c)) 869 goto tryanother; 870 } 871 } 872 /* 873 * Well, that worked. 874 */ 875 876 /* 877 * Try next offsets, in case this match is 878 * in the middle of a string. 879 */ 880 for (k = i + 1 ; k < NOFFSETS; k++) { 881 size_t no; 882 int adjust = 1; 883 if (prpsoffsets(k) >= prpsoffsets(i)) 884 continue; 885 for (no = doff + prpsoffsets(k); 886 no < doff + prpsoffsets(i); no++) 887 adjust = adjust 888 && isprint(nbuf[no]); 889 if (adjust) 890 i = k; 891 } 892 893 cname = CAST(unsigned char *, 894 &nbuf[doff + prpsoffsets(i)]); 895 for (cp = cname; cp < nbuf + size && *cp 896 && isprint(*cp); cp++) 897 continue; 898 /* 899 * Linux apparently appends a space at the end 900 * of the command line: remove it. 901 */ 902 while (cp > cname && isspace(cp[-1])) 903 cp--; 904 if (file_printf(ms, ", from '%.*s'", 905 CAST(int, cp - cname), cname) == -1) 906 return -1; 907 *flags |= FLAGS_DID_CORE; 908 return 1; 909 910 tryanother: 911 ; 912 } 913 } 914 break; 915 } 916 #endif 917 return 0; 918 } 919 920 private off_t 921 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, 922 off_t off, int num, off_t fsize, uint64_t virtaddr) 923 { 924 Elf32_Phdr ph32; 925 Elf64_Phdr ph64; 926 927 /* 928 * Loop through all the program headers and find the header with 929 * virtual address in which the "virtaddr" belongs to. 930 */ 931 for ( ; num; num--) { 932 if (pread(fd, xph_addr, xph_sizeof, off) < 933 CAST(ssize_t, xph_sizeof)) { 934 file_badread(ms); 935 return -1; 936 } 937 off += xph_sizeof; 938 939 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 940 /* Perhaps warn here */ 941 continue; 942 } 943 944 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) 945 return xph_offset + (virtaddr - xph_vaddr); 946 } 947 return 0; 948 } 949 950 private size_t 951 get_string_on_virtaddr(struct magic_set *ms, 952 int swap, int clazz, int fd, off_t ph_off, int ph_num, 953 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) 954 { 955 char *bptr; 956 off_t offset; 957 958 if (buflen == 0) 959 return 0; 960 961 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, 962 fsize, virtaddr); 963 if (offset < 0 || 964 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) { 965 file_badread(ms); 966 return 0; 967 } 968 969 buf[buflen - 1] = '\0'; 970 971 /* We expect only printable characters, so return if buffer contains 972 * non-printable character before the '\0' or just '\0'. */ 973 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++) 974 continue; 975 if (*bptr != '\0') 976 return 0; 977 978 return bptr - buf; 979 } 980 981 982 /*ARGSUSED*/ 983 private int 984 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 985 int swap, uint32_t namesz __attribute__((__unused__)), 986 uint32_t descsz __attribute__((__unused__)), 987 size_t noff __attribute__((__unused__)), size_t doff, 988 int *flags, size_t size __attribute__((__unused__)), int clazz, 989 int fd, off_t ph_off, int ph_num, off_t fsize) 990 { 991 #ifdef ELFCORE 992 Aux32Info auxv32; 993 Aux64Info auxv64; 994 size_t elsize = xauxv_sizeof; 995 const char *tag; 996 int is_string; 997 size_t nval; 998 999 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != 1000 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) 1001 return 0; 1002 1003 switch (*flags & FLAGS_CORE_STYLE) { 1004 case OS_STYLE_SVR4: 1005 if (type != NT_AUXV) 1006 return 0; 1007 break; 1008 #ifdef notyet 1009 case OS_STYLE_NETBSD: 1010 if (type != NT_NETBSD_CORE_AUXV) 1011 return 0; 1012 break; 1013 case OS_STYLE_FREEBSD: 1014 if (type != NT_FREEBSD_PROCSTAT_AUXV) 1015 return 0; 1016 break; 1017 #endif 1018 default: 1019 return 0; 1020 } 1021 1022 *flags |= FLAGS_DID_AUXV; 1023 1024 nval = 0; 1025 for (size_t off = 0; off + elsize <= descsz; off += elsize) { 1026 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 1027 /* Limit processing to 50 vector entries to prevent DoS */ 1028 if (nval++ >= 50) { 1029 file_error(ms, 0, "Too many ELF Auxv elements"); 1030 return 1; 1031 } 1032 1033 switch(xauxv_type) { 1034 case AT_LINUX_EXECFN: 1035 is_string = 1; 1036 tag = "execfn"; 1037 break; 1038 case AT_LINUX_PLATFORM: 1039 is_string = 1; 1040 tag = "platform"; 1041 break; 1042 case AT_LINUX_UID: 1043 is_string = 0; 1044 tag = "real uid"; 1045 break; 1046 case AT_LINUX_GID: 1047 is_string = 0; 1048 tag = "real gid"; 1049 break; 1050 case AT_LINUX_EUID: 1051 is_string = 0; 1052 tag = "effective uid"; 1053 break; 1054 case AT_LINUX_EGID: 1055 is_string = 0; 1056 tag = "effective gid"; 1057 break; 1058 default: 1059 is_string = 0; 1060 tag = NULL; 1061 break; 1062 } 1063 1064 if (tag == NULL) 1065 continue; 1066 1067 if (is_string) { 1068 char buf[256]; 1069 ssize_t buflen; 1070 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 1071 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 1072 1073 if (buflen == 0) 1074 continue; 1075 1076 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) 1077 return -1; 1078 } else { 1079 if (file_printf(ms, ", %s: %d", tag, 1080 CAST(int, xauxv_val)) == -1) 1081 return -1; 1082 } 1083 } 1084 return 1; 1085 #else 1086 return 0; 1087 #endif 1088 } 1089 1090 private size_t 1091 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1092 int clazz, int swap) 1093 { 1094 Elf32_Dyn dh32; 1095 Elf64_Dyn dh64; 1096 unsigned char *dbuf = CAST(unsigned char *, vbuf); 1097 1098 if (xdh_sizeof + offset > size) { 1099 /* 1100 * We're out of note headers. 1101 */ 1102 return xdh_sizeof + offset; 1103 } 1104 1105 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof); 1106 offset += xdh_sizeof; 1107 1108 switch (xdh_tag) { 1109 case DT_FLAGS_1: 1110 if (xdh_val & DF_1_PIE) 1111 ms->mode |= 0111; 1112 else 1113 ms->mode &= ~0111; 1114 break; 1115 default: 1116 break; 1117 } 1118 return offset; 1119 } 1120 1121 1122 private size_t 1123 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1124 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1125 int fd, off_t ph_off, int ph_num, off_t fsize) 1126 { 1127 Elf32_Nhdr nh32; 1128 Elf64_Nhdr nh64; 1129 size_t noff, doff; 1130 uint32_t namesz, descsz; 1131 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1132 1133 if (*notecount == 0) 1134 return 0; 1135 --*notecount; 1136 1137 if (xnh_sizeof + offset > size) { 1138 /* 1139 * We're out of note headers. 1140 */ 1141 return xnh_sizeof + offset; 1142 } 1143 /*XXX: GCC */ 1144 memset(&nh32, 0, sizeof(nh32)); 1145 memset(&nh64, 0, sizeof(nh64)); 1146 1147 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1148 offset += xnh_sizeof; 1149 1150 namesz = xnh_namesz; 1151 descsz = xnh_descsz; 1152 1153 if ((namesz == 0) && (descsz == 0)) { 1154 /* 1155 * We're out of note headers. 1156 */ 1157 return (offset >= size) ? offset : size; 1158 } 1159 1160 if (namesz & 0x80000000) { 1161 if (file_printf(ms, ", bad note name size %#lx", 1162 CAST(unsigned long, namesz)) == -1) 1163 return -1; 1164 return 0; 1165 } 1166 1167 if (descsz & 0x80000000) { 1168 if (file_printf(ms, ", bad note description size %#lx", 1169 CAST(unsigned long, descsz)) == -1) 1170 return -1; 1171 return 0; 1172 } 1173 1174 noff = offset; 1175 doff = ELF_ALIGN(offset + namesz); 1176 1177 if (offset + namesz > size) { 1178 /* 1179 * We're past the end of the buffer. 1180 */ 1181 return doff; 1182 } 1183 1184 offset = ELF_ALIGN(doff + descsz); 1185 if (doff + descsz > size) { 1186 /* 1187 * We're past the end of the buffer. 1188 */ 1189 return (offset >= size) ? offset : size; 1190 } 1191 1192 1193 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1194 if (do_os_note(ms, nbuf, xnh_type, swap, 1195 namesz, descsz, noff, doff, flags)) 1196 return offset; 1197 } 1198 1199 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1200 if (do_bid_note(ms, nbuf, xnh_type, swap, 1201 namesz, descsz, noff, doff, flags)) 1202 return offset; 1203 } 1204 1205 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1206 if (do_pax_note(ms, nbuf, xnh_type, swap, 1207 namesz, descsz, noff, doff, flags)) 1208 return offset; 1209 } 1210 1211 if ((*flags & FLAGS_DID_CORE) == 0) { 1212 if (do_core_note(ms, nbuf, xnh_type, swap, 1213 namesz, descsz, noff, doff, flags, size, clazz)) 1214 return offset; 1215 } 1216 1217 if ((*flags & FLAGS_DID_AUXV) == 0) { 1218 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1219 namesz, descsz, noff, doff, flags, size, clazz, 1220 fd, ph_off, ph_num, fsize)) 1221 return offset; 1222 } 1223 1224 if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) { 1225 int descw, flag; 1226 const char *str, *tag; 1227 if (descsz > 100) 1228 descsz = 100; 1229 switch (xnh_type) { 1230 case NT_NETBSD_VERSION: 1231 return offset; 1232 case NT_NETBSD_MARCH: 1233 flag = FLAGS_DID_NETBSD_MARCH; 1234 tag = "compiled for"; 1235 break; 1236 case NT_NETBSD_CMODEL: 1237 flag = FLAGS_DID_NETBSD_CMODEL; 1238 tag = "compiler model"; 1239 break; 1240 case NT_NETBSD_EMULATION: 1241 flag = FLAGS_DID_NETBSD_EMULATION; 1242 tag = "emulation:"; 1243 break; 1244 default: 1245 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1246 return offset; 1247 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1248 if (file_printf(ms, ", note=%u", xnh_type) == -1) 1249 return offset; 1250 return offset; 1251 } 1252 1253 if (*flags & flag) 1254 return offset; 1255 str = RCAST(const char *, &nbuf[doff]); 1256 descw = CAST(int, descsz); 1257 *flags |= flag; 1258 file_printf(ms, ", %s: %.*s", tag, descw, str); 1259 return offset; 1260 } 1261 1262 return offset; 1263 } 1264 1265 /* SunOS 5.x hardware capability descriptions */ 1266 typedef struct cap_desc { 1267 uint64_t cd_mask; 1268 const char *cd_name; 1269 } cap_desc_t; 1270 1271 static const cap_desc_t cap_desc_sparc[] = { 1272 { AV_SPARC_MUL32, "MUL32" }, 1273 { AV_SPARC_DIV32, "DIV32" }, 1274 { AV_SPARC_FSMULD, "FSMULD" }, 1275 { AV_SPARC_V8PLUS, "V8PLUS" }, 1276 { AV_SPARC_POPC, "POPC" }, 1277 { AV_SPARC_VIS, "VIS" }, 1278 { AV_SPARC_VIS2, "VIS2" }, 1279 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1280 { AV_SPARC_FMAF, "FMAF" }, 1281 { AV_SPARC_FJFMAU, "FJFMAU" }, 1282 { AV_SPARC_IMA, "IMA" }, 1283 { 0, NULL } 1284 }; 1285 1286 static const cap_desc_t cap_desc_386[] = { 1287 { AV_386_FPU, "FPU" }, 1288 { AV_386_TSC, "TSC" }, 1289 { AV_386_CX8, "CX8" }, 1290 { AV_386_SEP, "SEP" }, 1291 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1292 { AV_386_CMOV, "CMOV" }, 1293 { AV_386_MMX, "MMX" }, 1294 { AV_386_AMD_MMX, "AMD_MMX" }, 1295 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1296 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1297 { AV_386_FXSR, "FXSR" }, 1298 { AV_386_SSE, "SSE" }, 1299 { AV_386_SSE2, "SSE2" }, 1300 { AV_386_PAUSE, "PAUSE" }, 1301 { AV_386_SSE3, "SSE3" }, 1302 { AV_386_MON, "MON" }, 1303 { AV_386_CX16, "CX16" }, 1304 { AV_386_AHF, "AHF" }, 1305 { AV_386_TSCP, "TSCP" }, 1306 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1307 { AV_386_POPCNT, "POPCNT" }, 1308 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1309 { AV_386_SSSE3, "SSSE3" }, 1310 { AV_386_SSE4_1, "SSE4.1" }, 1311 { AV_386_SSE4_2, "SSE4.2" }, 1312 { 0, NULL } 1313 }; 1314 1315 private int 1316 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1317 size_t size, off_t fsize, int mach, int strtab, int *flags, 1318 uint16_t *notecount) 1319 { 1320 Elf32_Shdr sh32; 1321 Elf64_Shdr sh64; 1322 int stripped = 1, has_debug_info = 0; 1323 size_t nbadcap = 0; 1324 void *nbuf; 1325 off_t noff, coff, name_off; 1326 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ 1327 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ 1328 char name[50]; 1329 ssize_t namesize; 1330 1331 if (num == 0) { 1332 if (file_printf(ms, ", no section header") == -1) 1333 return -1; 1334 return 0; 1335 } 1336 if (size != xsh_sizeof) { 1337 if (file_printf(ms, ", corrupted section header size") == -1) 1338 return -1; 1339 return 0; 1340 } 1341 1342 /* Read offset of name section to be able to read section names later */ 1343 if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab))) 1344 < CAST(ssize_t, xsh_sizeof)) { 1345 if (file_printf(ms, ", missing section headers") == -1) 1346 return -1; 1347 return 0; 1348 } 1349 name_off = xsh_offset; 1350 1351 if (fsize != SIZE_UNKNOWN && fsize < name_off) { 1352 if (file_printf(ms, ", too large section header offset %td", 1353 name_off) == -1) 1354 return -1; 1355 return 0; 1356 } 1357 1358 for ( ; num; num--) { 1359 /* Read the name of this section. */ 1360 if ((namesize = pread(fd, name, sizeof(name) - 1, 1361 name_off + xsh_name)) == -1) { 1362 file_badread(ms); 1363 return -1; 1364 } 1365 name[namesize] = '\0'; 1366 if (strcmp(name, ".debug_info") == 0) { 1367 has_debug_info = 1; 1368 stripped = 0; 1369 } 1370 1371 if (pread(fd, xsh_addr, xsh_sizeof, off) < 1372 CAST(ssize_t, xsh_sizeof)) { 1373 file_badread(ms); 1374 return -1; 1375 } 1376 off += size; 1377 1378 /* Things we can determine before we seek */ 1379 switch (xsh_type) { 1380 case SHT_SYMTAB: 1381 #if 0 1382 case SHT_DYNSYM: 1383 #endif 1384 stripped = 0; 1385 break; 1386 default: 1387 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1388 /* Perhaps warn here */ 1389 continue; 1390 } 1391 break; 1392 } 1393 1394 1395 /* Things we can determine when we seek */ 1396 switch (xsh_type) { 1397 case SHT_NOTE: 1398 if (CAST(uintmax_t, (xsh_size + xsh_offset)) > 1399 CAST(uintmax_t, fsize)) { 1400 if (file_printf(ms, 1401 ", note offset/size %#" INTMAX_T_FORMAT 1402 "x+%#" INTMAX_T_FORMAT "x exceeds" 1403 " file size %#" INTMAX_T_FORMAT "x", 1404 CAST(uintmax_t, xsh_offset), 1405 CAST(uintmax_t, xsh_size), 1406 CAST(uintmax_t, fsize)) == -1) 1407 return -1; 1408 return 0; 1409 } 1410 if ((nbuf = malloc(xsh_size)) == NULL) { 1411 file_error(ms, errno, "Cannot allocate memory" 1412 " for note"); 1413 return -1; 1414 } 1415 if (pread(fd, nbuf, xsh_size, xsh_offset) < 1416 CAST(ssize_t, xsh_size)) { 1417 file_badread(ms); 1418 free(nbuf); 1419 return -1; 1420 } 1421 1422 noff = 0; 1423 for (;;) { 1424 if (noff >= CAST(off_t, xsh_size)) 1425 break; 1426 noff = donote(ms, nbuf, CAST(size_t, noff), 1427 xsh_size, clazz, swap, 4, flags, notecount, 1428 fd, 0, 0, 0); 1429 if (noff == 0) 1430 break; 1431 } 1432 free(nbuf); 1433 break; 1434 case SHT_SUNW_cap: 1435 switch (mach) { 1436 case EM_SPARC: 1437 case EM_SPARCV9: 1438 case EM_IA_64: 1439 case EM_386: 1440 case EM_AMD64: 1441 break; 1442 default: 1443 goto skip; 1444 } 1445 1446 if (nbadcap > 5) 1447 break; 1448 if (lseek(fd, xsh_offset, SEEK_SET) 1449 == CAST(off_t, -1)) { 1450 file_badseek(ms); 1451 return -1; 1452 } 1453 coff = 0; 1454 for (;;) { 1455 Elf32_Cap cap32; 1456 Elf64_Cap cap64; 1457 char cbuf[/*CONSTCOND*/ 1458 MAX(sizeof(cap32), sizeof(cap64))]; 1459 if ((coff += xcap_sizeof) > 1460 CAST(off_t, xsh_size)) 1461 break; 1462 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) != 1463 CAST(ssize_t, xcap_sizeof)) { 1464 file_badread(ms); 1465 return -1; 1466 } 1467 if (cbuf[0] == 'A') { 1468 #ifdef notyet 1469 char *p = cbuf + 1; 1470 uint32_t len, tag; 1471 memcpy(&len, p, sizeof(len)); 1472 p += 4; 1473 len = getu32(swap, len); 1474 if (memcmp("gnu", p, 3) != 0) { 1475 if (file_printf(ms, 1476 ", unknown capability %.3s", p) 1477 == -1) 1478 return -1; 1479 break; 1480 } 1481 p += strlen(p) + 1; 1482 tag = *p++; 1483 memcpy(&len, p, sizeof(len)); 1484 p += 4; 1485 len = getu32(swap, len); 1486 if (tag != 1) { 1487 if (file_printf(ms, ", unknown gnu" 1488 " capability tag %d", tag) 1489 == -1) 1490 return -1; 1491 break; 1492 } 1493 // gnu attributes 1494 #endif 1495 break; 1496 } 1497 memcpy(xcap_addr, cbuf, xcap_sizeof); 1498 switch (xcap_tag) { 1499 case CA_SUNW_NULL: 1500 break; 1501 case CA_SUNW_HW_1: 1502 cap_hw1 |= xcap_val; 1503 break; 1504 case CA_SUNW_SF_1: 1505 cap_sf1 |= xcap_val; 1506 break; 1507 default: 1508 if (file_printf(ms, 1509 ", with unknown capability " 1510 "%#" INT64_T_FORMAT "x = %#" 1511 INT64_T_FORMAT "x", 1512 CAST(unsigned long long, xcap_tag), 1513 CAST(unsigned long long, xcap_val)) 1514 == -1) 1515 return -1; 1516 if (nbadcap++ > 2) 1517 coff = xsh_size; 1518 break; 1519 } 1520 } 1521 /*FALLTHROUGH*/ 1522 skip: 1523 default: 1524 break; 1525 } 1526 } 1527 1528 if (has_debug_info) { 1529 if (file_printf(ms, ", with debug_info") == -1) 1530 return -1; 1531 } 1532 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1533 return -1; 1534 if (cap_hw1) { 1535 const cap_desc_t *cdp; 1536 switch (mach) { 1537 case EM_SPARC: 1538 case EM_SPARC32PLUS: 1539 case EM_SPARCV9: 1540 cdp = cap_desc_sparc; 1541 break; 1542 case EM_386: 1543 case EM_IA_64: 1544 case EM_AMD64: 1545 cdp = cap_desc_386; 1546 break; 1547 default: 1548 cdp = NULL; 1549 break; 1550 } 1551 if (file_printf(ms, ", uses") == -1) 1552 return -1; 1553 if (cdp) { 1554 while (cdp->cd_name) { 1555 if (cap_hw1 & cdp->cd_mask) { 1556 if (file_printf(ms, 1557 " %s", cdp->cd_name) == -1) 1558 return -1; 1559 cap_hw1 &= ~cdp->cd_mask; 1560 } 1561 ++cdp; 1562 } 1563 if (cap_hw1) 1564 if (file_printf(ms, 1565 " unknown hardware capability %#" 1566 INT64_T_FORMAT "x", 1567 CAST(unsigned long long, cap_hw1)) == -1) 1568 return -1; 1569 } else { 1570 if (file_printf(ms, 1571 " hardware capability %#" INT64_T_FORMAT "x", 1572 CAST(unsigned long long, cap_hw1)) == -1) 1573 return -1; 1574 } 1575 } 1576 if (cap_sf1) { 1577 if (cap_sf1 & SF1_SUNW_FPUSED) { 1578 if (file_printf(ms, 1579 (cap_sf1 & SF1_SUNW_FPKNWN) 1580 ? ", uses frame pointer" 1581 : ", not known to use frame pointer") == -1) 1582 return -1; 1583 } 1584 cap_sf1 &= ~SF1_SUNW_MASK; 1585 if (cap_sf1) 1586 if (file_printf(ms, 1587 ", with unknown software capability %#" 1588 INT64_T_FORMAT "x", 1589 CAST(unsigned long long, cap_sf1)) == -1) 1590 return -1; 1591 } 1592 return 0; 1593 } 1594 1595 /* 1596 * Look through the program headers of an executable image, searching 1597 * for a PT_INTERP section; if one is found, it's dynamically linked, 1598 * otherwise it's statically linked. 1599 */ 1600 private int 1601 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1602 int num, size_t size, off_t fsize, int sh_num, int *flags, 1603 uint16_t *notecount) 1604 { 1605 Elf32_Phdr ph32; 1606 Elf64_Phdr ph64; 1607 const char *linking_style = "statically"; 1608 unsigned char nbuf[BUFSIZ]; 1609 char ibuf[BUFSIZ]; 1610 char interp[BUFSIZ]; 1611 ssize_t bufsize; 1612 size_t offset, align, len; 1613 1614 if (num == 0) { 1615 if (file_printf(ms, ", no program header") == -1) 1616 return -1; 1617 return 0; 1618 } 1619 if (size != xph_sizeof) { 1620 if (file_printf(ms, ", corrupted program header size") == -1) 1621 return -1; 1622 return 0; 1623 } 1624 1625 interp[0] = '\0'; 1626 for ( ; num; num--) { 1627 int doread; 1628 if (pread(fd, xph_addr, xph_sizeof, off) < 1629 CAST(ssize_t, xph_sizeof)) { 1630 file_badread(ms); 1631 return -1; 1632 } 1633 1634 off += size; 1635 bufsize = 0; 1636 align = 4; 1637 1638 /* Things we can determine before we seek */ 1639 switch (xph_type) { 1640 case PT_DYNAMIC: 1641 doread = 1; 1642 break; 1643 case PT_NOTE: 1644 if (sh_num) /* Did this through section headers */ 1645 continue; 1646 if (((align = xph_align) & 0x80000000UL) != 0 || 1647 align < 4) { 1648 if (file_printf(ms, 1649 ", invalid note alignment %#lx", 1650 CAST(unsigned long, align)) == -1) 1651 return -1; 1652 align = 4; 1653 } 1654 /*FALLTHROUGH*/ 1655 case PT_INTERP: 1656 linking_style = "dynamically"; 1657 doread = 1; 1658 break; 1659 default: 1660 doread = 0; 1661 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1662 /* Maybe warn here? */ 1663 continue; 1664 } 1665 break; 1666 } 1667 1668 if (doread) { 1669 len = xph_filesz < sizeof(nbuf) ? xph_filesz 1670 : sizeof(nbuf); 1671 bufsize = pread(fd, nbuf, len, xph_offset); 1672 if (bufsize == -1) { 1673 file_badread(ms); 1674 return -1; 1675 } 1676 } else 1677 len = 0; 1678 1679 /* Things we can determine when we seek */ 1680 switch (xph_type) { 1681 case PT_DYNAMIC: 1682 offset = 0; 1683 // Let DF_1 determine if we are PIE or not. 1684 ms->mode &= ~0111; 1685 for (;;) { 1686 if (offset >= CAST(size_t, bufsize)) 1687 break; 1688 offset = dodynamic(ms, nbuf, offset, 1689 CAST(size_t, bufsize), clazz, swap); 1690 if (offset == 0) 1691 break; 1692 } 1693 break; 1694 1695 case PT_INTERP: 1696 if (bufsize && nbuf[0]) { 1697 nbuf[bufsize - 1] = '\0'; 1698 memcpy(interp, nbuf, CAST(size_t, bufsize)); 1699 } else 1700 strlcpy(interp, "*empty*", sizeof(interp)); 1701 break; 1702 case PT_NOTE: 1703 /* 1704 * This is a PT_NOTE section; loop through all the notes 1705 * in the section. 1706 */ 1707 offset = 0; 1708 for (;;) { 1709 if (offset >= CAST(size_t, bufsize)) 1710 break; 1711 offset = donote(ms, nbuf, offset, 1712 CAST(size_t, bufsize), clazz, swap, align, 1713 flags, notecount, fd, 0, 0, 0); 1714 if (offset == 0) 1715 break; 1716 } 1717 break; 1718 default: 1719 break; 1720 } 1721 } 1722 if (file_printf(ms, ", %s linked", linking_style) 1723 == -1) 1724 return -1; 1725 if (interp[0]) 1726 if (file_printf(ms, ", interpreter %s", 1727 file_printable(ibuf, sizeof(ibuf), interp, sizeof(interp))) 1728 == -1) 1729 return -1; 1730 return 0; 1731 } 1732 1733 1734 protected int 1735 file_tryelf(struct magic_set *ms, const struct buffer *b) 1736 { 1737 int fd = b->fd; 1738 const unsigned char *buf = CAST(const unsigned char *, b->fbuf); 1739 size_t nbytes = b->flen; 1740 union { 1741 int32_t l; 1742 char c[sizeof(int32_t)]; 1743 } u; 1744 int clazz; 1745 int swap; 1746 struct stat st; 1747 const struct stat *stp; 1748 off_t fsize; 1749 int flags = 0; 1750 Elf32_Ehdr elf32hdr; 1751 Elf64_Ehdr elf64hdr; 1752 uint16_t type, phnum, shnum, notecount; 1753 1754 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION)) 1755 return 0; 1756 /* 1757 * ELF executables have multiple section headers in arbitrary 1758 * file locations and thus file(1) cannot determine it from easily. 1759 * Instead we traverse thru all section headers until a symbol table 1760 * one is found or else the binary is stripped. 1761 * Return immediately if it's not ELF (so we avoid pipe2file unless 1762 * needed). 1763 */ 1764 if (buf[EI_MAG0] != ELFMAG0 1765 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1766 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1767 return 0; 1768 1769 /* 1770 * If we cannot seek, it must be a pipe, socket or fifo. 1771 */ 1772 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) 1773 && (errno == ESPIPE)) 1774 fd = file_pipe2file(ms, fd, buf, nbytes); 1775 1776 if (fd == -1) { 1777 file_badread(ms); 1778 return -1; 1779 } 1780 1781 stp = &b->st; 1782 /* 1783 * b->st.st_size != 0 if previous fstat() succeeded, 1784 * which is likely, we can avoid extra stat() call. 1785 */ 1786 if (b->st.st_size == 0) { 1787 stp = &st; 1788 if (fstat(fd, &st) == -1) { 1789 file_badread(ms); 1790 return -1; 1791 } 1792 } 1793 if (S_ISREG(stp->st_mode) || stp->st_size != 0) 1794 fsize = stp->st_size; 1795 else 1796 fsize = SIZE_UNKNOWN; 1797 1798 clazz = buf[EI_CLASS]; 1799 1800 switch (clazz) { 1801 case ELFCLASS32: 1802 #undef elf_getu 1803 #define elf_getu(a, b) elf_getu32(a, b) 1804 #undef elfhdr 1805 #define elfhdr elf32hdr 1806 #include "elfclass.h" 1807 case ELFCLASS64: 1808 #undef elf_getu 1809 #define elf_getu(a, b) elf_getu64(a, b) 1810 #undef elfhdr 1811 #define elfhdr elf64hdr 1812 #include "elfclass.h" 1813 default: 1814 if (file_printf(ms, ", unknown class %d", clazz) == -1) 1815 return -1; 1816 break; 1817 } 1818 return 0; 1819 } 1820 #endif 1821