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 1.206 2026/04/24 19:14:02 christos Exp $") 31 #endif 32 33 #ifdef BUILTIN_ELF 34 #include <string.h> 35 #include <ctype.h> 36 #include <stdlib.h> 37 #include <stdarg.h> 38 #ifdef HAVE_UNISTD_H 39 #include <unistd.h> 40 #endif 41 42 #include "readelf.h" 43 #include "magic.h" 44 45 #ifdef ELFCORE 46 file_private int dophn_core(struct magic_set *, int, int, int, off_t, int, 47 size_t, off_t, int *, uint16_t *); 48 #endif 49 file_private int dophn_exec(struct magic_set *, int, int, int, off_t, int, 50 size_t, off_t, int, int *, uint16_t *); 51 file_private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, 52 off_t, int, int, int *, uint16_t *); 53 file_private size_t donote(struct magic_set *, void *, size_t, size_t, int, 54 int, size_t, int *, uint16_t *, int, off_t, int, off_t); 55 56 #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) 57 58 #define isquote(c) (strchr("'\"`", (c)) != NULL) 59 60 file_private uint16_t getu16(int, uint16_t); 61 file_private uint32_t getu32(int, uint32_t); 62 file_private uint64_t getu64(int, uint64_t); 63 64 #define NBUFSIZE 2024 65 #define SIZE_UNKNOWN CAST(off_t, -1) 66 #define NAMEEQUALS(n, v) \ 67 (namesz == sizeof(v) && memcmp(n, v, namesz) == 0) 68 69 __attribute__((__format__(__printf__, 2, 3))) 70 file_private int 71 elf_printf(struct magic_set *ms, const char *fmt, ...) 72 { 73 va_list ap; 74 int rv; 75 76 if (ms->flags & MAGIC_MIME) 77 return 1; 78 79 va_start(ap, fmt); 80 rv = file_vprintf(ms, fmt, ap); 81 va_end(ap); 82 return rv; 83 } 84 file_private int 85 toomany(struct magic_set *ms, const char *name, uint16_t num) 86 { 87 if (elf_printf(ms, ", too many %s (%u)", name, num) == -1) 88 return -1; 89 return 1; 90 } 91 92 file_private uint16_t 93 getu16(int swap, uint16_t value) 94 { 95 union { 96 uint16_t ui; 97 char c[2]; 98 } retval, tmpval; 99 100 if (swap) { 101 tmpval.ui = value; 102 103 retval.c[0] = tmpval.c[1]; 104 retval.c[1] = tmpval.c[0]; 105 106 return retval.ui; 107 } else 108 return value; 109 } 110 111 file_private uint32_t 112 getu32(int swap, uint32_t value) 113 { 114 union { 115 uint32_t ui; 116 char c[4]; 117 } retval, tmpval; 118 119 if (swap) { 120 tmpval.ui = value; 121 122 retval.c[0] = tmpval.c[3]; 123 retval.c[1] = tmpval.c[2]; 124 retval.c[2] = tmpval.c[1]; 125 retval.c[3] = tmpval.c[0]; 126 127 return retval.ui; 128 } else 129 return value; 130 } 131 132 file_private uint64_t 133 getu64(int swap, uint64_t value) 134 { 135 union { 136 uint64_t ui; 137 char c[8]; 138 } retval, tmpval; 139 140 if (swap) { 141 tmpval.ui = value; 142 143 retval.c[0] = tmpval.c[7]; 144 retval.c[1] = tmpval.c[6]; 145 retval.c[2] = tmpval.c[5]; 146 retval.c[3] = tmpval.c[4]; 147 retval.c[4] = tmpval.c[3]; 148 retval.c[5] = tmpval.c[2]; 149 retval.c[6] = tmpval.c[1]; 150 retval.c[7] = tmpval.c[0]; 151 152 return retval.ui; 153 } else 154 return value; 155 } 156 157 #define elf_getu16(swap, value) getu16(swap, value) 158 #define elf_getu32(swap, value) getu32(swap, value) 159 #define elf_getu64(swap, value) getu64(swap, value) 160 161 #define xsh_addr (clazz == ELFCLASS32 \ 162 ? CAST(void *, &sh32) \ 163 : CAST(void *, &sh64)) 164 #define xsh_sizeof (clazz == ELFCLASS32 \ 165 ? sizeof(sh32) \ 166 : sizeof(sh64)) 167 #define xsh_size CAST(size_t, (clazz == ELFCLASS32 \ 168 ? elf_getu32(swap, sh32.sh_size) \ 169 : elf_getu64(swap, sh64.sh_size))) 170 #define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \ 171 ? elf_getu32(swap, sh32.sh_offset) \ 172 : elf_getu64(swap, sh64.sh_offset))) 173 #define xsh_type (clazz == ELFCLASS32 \ 174 ? elf_getu32(swap, sh32.sh_type) \ 175 : elf_getu32(swap, sh64.sh_type)) 176 #define xsh_name (clazz == ELFCLASS32 \ 177 ? elf_getu32(swap, sh32.sh_name) \ 178 : elf_getu32(swap, sh64.sh_name)) 179 180 #define xph_addr (clazz == ELFCLASS32 \ 181 ? CAST(void *, &ph32) \ 182 : CAST(void *, &ph64)) 183 #define xph_sizeof (clazz == ELFCLASS32 \ 184 ? sizeof(ph32) \ 185 : sizeof(ph64)) 186 #define xph_type (clazz == ELFCLASS32 \ 187 ? elf_getu32(swap, ph32.p_type) \ 188 : elf_getu32(swap, ph64.p_type)) 189 #define xph_offset CAST(off_t, (clazz == ELFCLASS32 \ 190 ? elf_getu32(swap, ph32.p_offset) \ 191 : elf_getu64(swap, ph64.p_offset))) 192 #define xph_align CAST(size_t, (clazz == ELFCLASS32 \ 193 ? CAST(off_t, (ph32.p_align ? \ 194 elf_getu32(swap, ph32.p_align) : 4))\ 195 : CAST(off_t, (ph64.p_align ? \ 196 elf_getu64(swap, ph64.p_align) : 4)))) 197 #define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \ 198 ? CAST(off_t, (ph32.p_vaddr ? \ 199 elf_getu32(swap, ph32.p_vaddr) : 4))\ 200 : CAST(off_t, (ph64.p_vaddr ? \ 201 elf_getu64(swap, ph64.p_vaddr) : 4)))) 202 #define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \ 203 ? elf_getu32(swap, ph32.p_filesz) \ 204 : elf_getu64(swap, ph64.p_filesz))) 205 #define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \ 206 ? elf_getu32(swap, ph32.p_memsz) \ 207 : elf_getu64(swap, ph64.p_memsz)))) 208 #define xnh_addr (clazz == ELFCLASS32 \ 209 ? CAST(void *, &nh32) \ 210 : CAST(void *, &nh64)) 211 #define xnh_sizeof (clazz == ELFCLASS32 \ 212 ? sizeof(nh32) \ 213 : sizeof(nh64)) 214 #define xnh_type (clazz == ELFCLASS32 \ 215 ? elf_getu32(swap, nh32.n_type) \ 216 : elf_getu32(swap, nh64.n_type)) 217 #define xnh_namesz (clazz == ELFCLASS32 \ 218 ? elf_getu32(swap, nh32.n_namesz) \ 219 : elf_getu32(swap, nh64.n_namesz)) 220 #define xnh_descsz (clazz == ELFCLASS32 \ 221 ? elf_getu32(swap, nh32.n_descsz) \ 222 : elf_getu32(swap, nh64.n_descsz)) 223 224 #define xdh_addr (clazz == ELFCLASS32 \ 225 ? CAST(void *, &dh32) \ 226 : CAST(void *, &dh64)) 227 #define xdh_sizeof (clazz == ELFCLASS32 \ 228 ? sizeof(dh32) \ 229 : sizeof(dh64)) 230 #define xdh_tag (clazz == ELFCLASS32 \ 231 ? elf_getu32(swap, dh32.d_tag) \ 232 : elf_getu64(swap, dh64.d_tag)) 233 #define xdh_val (clazz == ELFCLASS32 \ 234 ? elf_getu32(swap, dh32.d_un.d_val) \ 235 : elf_getu64(swap, dh64.d_un.d_val)) 236 237 #define xcap_addr (clazz == ELFCLASS32 \ 238 ? CAST(void *, &cap32) \ 239 : CAST(void *, &cap64)) 240 #define xcap_sizeof (clazz == ELFCLASS32 \ 241 ? sizeof(cap32) \ 242 : sizeof(cap64)) 243 #define xcap_tag (clazz == ELFCLASS32 \ 244 ? elf_getu32(swap, cap32.c_tag) \ 245 : elf_getu64(swap, cap64.c_tag)) 246 #define xcap_val (clazz == ELFCLASS32 \ 247 ? elf_getu32(swap, cap32.c_un.c_val) \ 248 : elf_getu64(swap, cap64.c_un.c_val)) 249 250 #define xauxv_addr (clazz == ELFCLASS32 \ 251 ? CAST(void *, &auxv32) \ 252 : CAST(void *, &auxv64)) 253 #define xauxv_sizeof (clazz == ELFCLASS32 \ 254 ? sizeof(auxv32) \ 255 : sizeof(auxv64)) 256 #define xauxv_type (clazz == ELFCLASS32 \ 257 ? elf_getu32(swap, auxv32.a_type) \ 258 : elf_getu64(swap, auxv64.a_type)) 259 #define xauxv_val (clazz == ELFCLASS32 \ 260 ? elf_getu32(swap, auxv32.a_v) \ 261 : elf_getu64(swap, auxv64.a_v)) 262 263 #define prpsoffsets(i) (clazz == ELFCLASS32 \ 264 ? prpsoffsets32[i] \ 265 : prpsoffsets64[i]) 266 267 #ifdef ELFCORE 268 /* 269 * Try larger offsets first to avoid false matches 270 * from earlier data that happen to look like strings. 271 */ 272 static const size_t prpsoffsets32[] = { 273 #ifdef USE_NT_PSINFO 274 104, /* SunOS 5.x (command line) */ 275 88, /* SunOS 5.x (short name) */ 276 #endif /* USE_NT_PSINFO */ 277 278 100, /* SunOS 5.x (command line) */ 279 84, /* SunOS 5.x (short name) */ 280 281 44, /* Linux (command line) */ 282 28, /* Linux (short name) */ 283 284 48, /* Linux PowerPC (command line) */ 285 32, /* Linux PowerPC (short name) */ 286 287 8, /* FreeBSD */ 288 }; 289 290 static const size_t prpsoffsets64[] = { 291 #ifdef USE_NT_PSINFO 292 152, /* SunOS 5.x (command line) */ 293 136, /* SunOS 5.x (short name) */ 294 #endif /* USE_NT_PSINFO */ 295 296 136, /* SunOS 5.x, 64-bit (command line) */ 297 120, /* SunOS 5.x, 64-bit (short name) */ 298 299 56, /* Linux (command line) */ 300 40, /* Linux (tested on core from 2.4.x, short name) */ 301 302 16, /* FreeBSD, 64-bit */ 303 }; 304 305 #define NOFFSETS32 __arraycount(prpsoffsets32) 306 #define NOFFSETS64 __arraycount(prpsoffsets64) 307 308 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) 309 310 /* 311 * Look through the program headers of an executable image, searching 312 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or 313 * "FreeBSD"; if one is found, try looking in various places in its 314 * contents for a 16-character string containing only printable 315 * characters - if found, that string should be the name of the program 316 * that dropped core. Note: right after that 16-character string is, 317 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and 318 * Linux, a longer string (80 characters, in 5.x, probably other 319 * SVR4-flavored systems, and Linux) containing the start of the 320 * command line for that program. 321 * 322 * SunOS 5.x core files contain two PT_NOTE sections, with the types 323 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the 324 * same info about the command name and command line, so it probably 325 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided 326 * above (see USE_NT_PSINFO), in case we ever decide to do so. The 327 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; 328 * the SunOS 5.x file command relies on this (and prefers the latter). 329 * 330 * The signal number probably appears in a section of type NT_PRSTATUS, 331 * but that's also rather OS-dependent, in ways that are harder to 332 * dissect with heuristics, so I'm not bothering with the signal number. 333 * (I suppose the signal number could be of interest in situations where 334 * you don't have the binary of the program that dropped core; if you 335 * *do* have that binary, the debugger will probably tell you what 336 * signal it was.) 337 */ 338 339 #define OS_STYLE_SVR4 0 340 #define OS_STYLE_FREEBSD 1 341 #define OS_STYLE_NETBSD 2 342 343 file_private const char os_style_names[][8] = { 344 "SVR4", 345 "FreeBSD", 346 "NetBSD", 347 }; 348 349 #define FLAGS_CORE_STYLE 0x0003 350 351 #define FLAGS_DID_CORE 0x0004 352 #define FLAGS_DID_OS_NOTE 0x0008 353 #define FLAGS_DID_BUILD_ID 0x0010 354 #define FLAGS_DID_CORE_STYLE 0x0020 355 #define FLAGS_DID_NETBSD_PAX 0x0040 356 #define FLAGS_DID_NETBSD_MARCH 0x0080 357 #define FLAGS_DID_NETBSD_CMODEL 0x0100 358 #define FLAGS_DID_NETBSD_EMULATION 0x0200 359 #define FLAGS_DID_NETBSD_UNKNOWN 0x0400 360 #define FLAGS_DID_ANDROID_MEMTAG 0x0800 361 #define FLAGS_IS_CORE 0x1000 362 #define FLAGS_DID_AUXV 0x2000 363 364 file_private int 365 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 366 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) 367 { 368 Elf32_Phdr ph32; 369 Elf64_Phdr ph64; 370 size_t offset, len; 371 unsigned char nbuf[NBUFSIZE]; 372 ssize_t bufsize; 373 off_t ph_off = off, offs; 374 int ph_num = num; 375 376 if (ms->flags & MAGIC_MIME) 377 return 0; 378 379 if (num == 0) { 380 if (elf_printf(ms, ", no program header") == -1) 381 return -1; 382 return 0; 383 } 384 if (size != xph_sizeof) { 385 if (elf_printf(ms, ", corrupted program header size") == -1) 386 return -1; 387 return 0; 388 } 389 390 /* 391 * Loop through all the program headers. 392 */ 393 for ( ; num; num--) { 394 if (pread(fd, xph_addr, xph_sizeof, off) < 395 CAST(ssize_t, xph_sizeof)) { 396 if (elf_printf(ms, 397 ", can't read elf program headers at %jd", 398 (intmax_t)off) == -1) 399 return -1; 400 return 0; 401 } 402 off += size; 403 404 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 405 /* Perhaps warn here */ 406 continue; 407 } 408 409 if (xph_type != PT_NOTE) 410 continue; 411 412 /* 413 * This is a PT_NOTE section; loop through all the notes 414 * in the section. 415 */ 416 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); 417 offs = xph_offset; 418 if ((bufsize = pread(fd, nbuf, len, offs)) == -1) { 419 if (elf_printf(ms, " can't read note section at %jd", 420 (intmax_t)offs) == -1) 421 return -1; 422 return 0; 423 } 424 offset = 0; 425 for (;;) { 426 if (offset >= CAST(size_t, bufsize)) 427 break; 428 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize), 429 clazz, swap, 4, flags, notecount, fd, ph_off, 430 ph_num, fsize); 431 if (offset == 0) 432 break; 433 434 } 435 } 436 return 0; 437 } 438 #endif 439 440 static int 441 do_note_netbsd_version(struct magic_set *ms, int swap, void *v) 442 { 443 uint32_t desc; 444 memcpy(&desc, v, sizeof(desc)); 445 desc = elf_getu32(swap, desc); 446 447 if (elf_printf(ms, ", for NetBSD") == -1) 448 return -1; 449 /* 450 * The version number used to be stuck as 199905, and was thus 451 * basically content-free. Newer versions of NetBSD have fixed 452 * this and now use the encoding of __NetBSD_Version__: 453 * 454 * MMmmrrpp00 455 * 456 * M = major version 457 * m = minor version 458 * r = release ["",A-Z,Z[A-Z] but numeric] 459 * p = patchlevel 460 */ 461 if (desc > 100000000U) { 462 uint32_t ver_patch = (desc / 100) % 100; 463 uint32_t ver_rel = (desc / 10000) % 100; 464 uint32_t ver_min = (desc / 1000000) % 100; 465 uint32_t ver_maj = desc / 100000000; 466 467 if (elf_printf(ms, " %u.%u", ver_maj, ver_min) == -1) 468 return -1; 469 if (ver_maj >= 9) { 470 ver_patch += 100 * ver_rel; 471 ver_rel = 0; 472 } 473 if (ver_rel == 0 && ver_patch != 0) { 474 if (elf_printf(ms, ".%u", ver_patch) == -1) 475 return -1; 476 } else if (ver_rel != 0) { 477 while (ver_rel > 26) { 478 if (elf_printf(ms, "Z") == -1) 479 return -1; 480 ver_rel -= 26; 481 } 482 if (elf_printf(ms, "%c", 'A' + ver_rel - 1) == -1) 483 return -1; 484 } 485 } 486 return 0; 487 } 488 489 static int 490 do_note_freebsd_version(struct magic_set *ms, int swap, void *v) 491 { 492 uint32_t desc; 493 494 memcpy(&desc, v, sizeof(desc)); 495 desc = elf_getu32(swap, desc); 496 if (elf_printf(ms, ", for FreeBSD") == -1) 497 return -1; 498 499 /* 500 * Contents is __FreeBSD_version, whose relation to OS 501 * versions is defined by a huge table in the Porter's 502 * Handbook. This is the general scheme: 503 * 504 * Releases: 505 * Mmp000 (before 4.10) 506 * Mmi0p0 (before 5.0) 507 * Mmm0p0 508 * 509 * Development branches: 510 * Mmpxxx (before 4.6) 511 * Mmp1xx (before 4.10) 512 * Mmi1xx (before 5.0) 513 * M000xx (pre-M.0) 514 * Mmm1xx 515 * 516 * M = major version 517 * m = minor version 518 * i = minor version increment (491000 -> 4.10) 519 * p = patchlevel 520 * x = revision 521 * 522 * The first release of FreeBSD to use ELF by default 523 * was version 3.0. 524 */ 525 if (desc == 460002) { 526 if (elf_printf(ms, " 4.6.2") == -1) 527 return -1; 528 } else if (desc < 460100) { 529 if (elf_printf(ms, " %d.%d", desc / 100000, 530 desc / 10000 % 10) == -1) 531 return -1; 532 if (desc / 1000 % 10 > 0) 533 if (elf_printf(ms, ".%d", desc / 1000 % 10) == -1) 534 return -1; 535 if ((desc % 1000 > 0) || (desc % 100000 == 0)) 536 if (elf_printf(ms, " (%d)", desc) == -1) 537 return -1; 538 } else if (desc < 500000) { 539 if (elf_printf(ms, " %d.%d", desc / 100000, 540 desc / 10000 % 10 + desc / 1000 % 10) == -1) 541 return -1; 542 if (desc / 100 % 10 > 0) { 543 if (elf_printf(ms, " (%d)", desc) == -1) 544 return -1; 545 } else if (desc / 10 % 10 > 0) { 546 if (elf_printf(ms, ".%d", desc / 10 % 10) == -1) 547 return -1; 548 } 549 } else { 550 if (elf_printf(ms, " %d.%d", desc / 100000, 551 desc / 1000 % 100) == -1) 552 return -1; 553 if ((desc / 100 % 10 > 0) || 554 (desc % 100000 / 100 == 0)) { 555 if (elf_printf(ms, " (%d)", desc) == -1) 556 return -1; 557 } else if (desc / 10 % 10 > 0) { 558 if (elf_printf(ms, ".%d", desc / 10 % 10) == -1) 559 return -1; 560 } 561 } 562 return 0; 563 } 564 565 file_private int 566 /*ARGSUSED*/ 567 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 568 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, 569 size_t noff, size_t doff, int *flags) 570 { 571 if (NAMEEQUALS(RCAST(char *, &nbuf[noff]), "GNU") && 572 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) { 573 uint8_t desc[20]; 574 const char *btype; 575 uint32_t i; 576 *flags |= FLAGS_DID_BUILD_ID; 577 switch (descsz) { 578 case 8: 579 btype = "xxHash"; 580 break; 581 case 16: 582 btype = "md5/uuid"; 583 break; 584 case 20: 585 btype = "sha1"; 586 break; 587 default: 588 btype = "unknown"; 589 break; 590 } 591 if (elf_printf(ms, ", BuildID[%s]=", btype) == -1) 592 return -1; 593 memcpy(desc, &nbuf[doff], descsz); 594 for (i = 0; i < descsz; i++) 595 if (elf_printf(ms, "%02x", desc[i]) == -1) 596 return -1; 597 return 1; 598 } 599 if (namesz == 4 && memcmp(RCAST(char *, &nbuf[noff]), "Go", 3) == 0 && 600 type == NT_GO_BUILD_ID && descsz < 128) { 601 char buf[256]; 602 if (elf_printf(ms, ", Go BuildID=%s", 603 file_copystr(buf, sizeof(buf), descsz, 604 RCAST(const char *, &nbuf[doff]))) == -1) 605 return -1; 606 return 1; 607 } 608 return 0; 609 } 610 611 file_private int 612 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 613 int swap, uint32_t namesz, uint32_t descsz, 614 size_t noff, size_t doff, int *flags) 615 { 616 const char *name = RCAST(const char *, &nbuf[noff]); 617 618 if (NAMEEQUALS(name, "SuSE") && type == NT_GNU_VERSION && descsz == 2) { 619 *flags |= FLAGS_DID_OS_NOTE; 620 if (elf_printf(ms, ", for SuSE %d.%d", nbuf[doff], 621 nbuf[doff + 1]) == -1) 622 return -1; 623 return 1; 624 } 625 626 if (NAMEEQUALS(name, "GNU") && type == NT_GNU_VERSION && descsz == 16) { 627 uint32_t desc[4]; 628 memcpy(desc, &nbuf[doff], sizeof(desc)); 629 630 *flags |= FLAGS_DID_OS_NOTE; 631 if (elf_printf(ms, ", for GNU/") == -1) 632 return -1; 633 switch (elf_getu32(swap, desc[0])) { 634 case GNU_OS_LINUX: 635 if (elf_printf(ms, "Linux") == -1) 636 return -1; 637 break; 638 case GNU_OS_HURD: 639 if (elf_printf(ms, "Hurd") == -1) 640 return -1; 641 break; 642 case GNU_OS_SOLARIS: 643 if (elf_printf(ms, "Solaris") == -1) 644 return -1; 645 break; 646 case GNU_OS_KFREEBSD: 647 if (elf_printf(ms, "kFreeBSD") == -1) 648 return -1; 649 break; 650 case GNU_OS_KNETBSD: 651 if (elf_printf(ms, "kNetBSD") == -1) 652 return -1; 653 break; 654 default: 655 if (elf_printf(ms, "<unknown>") == -1) 656 return -1; 657 } 658 if (elf_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), 659 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) 660 return -1; 661 return 1; 662 } 663 664 if (NAMEEQUALS(name, "NetBSD") && 665 type == NT_NETBSD_VERSION && descsz == 4) { 666 *flags |= FLAGS_DID_OS_NOTE; 667 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1) 668 return -1; 669 return 1; 670 } 671 672 if (NAMEEQUALS(name, "FreeBSD") && 673 type == NT_FREEBSD_VERSION && descsz == 4) { 674 *flags |= FLAGS_DID_OS_NOTE; 675 if (do_note_freebsd_version(ms, swap, &nbuf[doff]) 676 == -1) 677 return -1; 678 return 1; 679 } 680 681 if (NAMEEQUALS(name, "OpenBSD") && 682 type == NT_OPENBSD_VERSION && descsz == 4) { 683 *flags |= FLAGS_DID_OS_NOTE; 684 if (elf_printf(ms, ", for OpenBSD") == -1) 685 return -1; 686 /* Content of note is always 0 */ 687 return 1; 688 } 689 690 if (NAMEEQUALS(name, "DragonFly") && 691 type == NT_DRAGONFLY_VERSION && descsz == 4) { 692 uint32_t desc; 693 *flags |= FLAGS_DID_OS_NOTE; 694 if (elf_printf(ms, ", for DragonFly") == -1) 695 return -1; 696 memcpy(&desc, &nbuf[doff], sizeof(desc)); 697 desc = elf_getu32(swap, desc); 698 if (elf_printf(ms, " %d.%d.%d", desc / 100000, 699 desc / 10000 % 10, desc % 10000) == -1) 700 return -1; 701 return 1; 702 } 703 704 if (NAMEEQUALS(name, "Android") && 705 type == NT_ANDROID_VERSION && descsz >= 4) { 706 uint32_t api_level; 707 *flags |= FLAGS_DID_OS_NOTE; 708 memcpy(&api_level, &nbuf[doff], sizeof(api_level)); 709 api_level = elf_getu32(swap, api_level); 710 if (elf_printf(ms, ", for Android %d", api_level) == -1) 711 return -1; 712 /* 713 * NDK r14 and later also include details of the NDK that 714 * built the binary. OS binaries (or binaries built by older 715 * NDKs) don't have this. The NDK release and build number 716 * are both 64-byte strings. 717 */ 718 if (descsz >= 4 + 64 + 64) { 719 if (elf_printf(ms, ", built by NDK %.64s (%.64s)", 720 &nbuf[doff + 4], &nbuf[doff + 4 + 64]) == -1) 721 return -1; 722 } 723 } 724 725 return 0; 726 } 727 728 file_private int 729 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 730 int swap, uint32_t namesz, uint32_t descsz, 731 size_t noff, size_t doff, int *flags) 732 { 733 const char *name = RCAST(const char *, &nbuf[noff]); 734 735 if (NAMEEQUALS(name, "PaX") && type == NT_NETBSD_PAX && descsz == 4) { 736 static const char *pax[] = { 737 "+mprotect", 738 "-mprotect", 739 "+segvguard", 740 "-segvguard", 741 "+ASLR", 742 "-ASLR", 743 }; 744 uint32_t desc; 745 size_t i; 746 int did = 0; 747 748 *flags |= FLAGS_DID_NETBSD_PAX; 749 memcpy(&desc, &nbuf[doff], sizeof(desc)); 750 desc = elf_getu32(swap, desc); 751 752 if (desc && elf_printf(ms, ", PaX: ") == -1) 753 return -1; 754 755 for (i = 0; i < __arraycount(pax); i++) { 756 if (((1 << CAST(int, i)) & desc) == 0) 757 continue; 758 if (elf_printf(ms, "%s%s", did++ ? "," : "", 759 pax[i]) == -1) 760 return -1; 761 } 762 return 1; 763 } 764 return 0; 765 } 766 767 file_private int 768 do_memtag_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 769 int swap, uint32_t namesz, uint32_t descsz, 770 size_t noff, size_t doff, int *flags) 771 { 772 const char *name = RCAST(const char *, &nbuf[noff]); 773 774 if (NAMEEQUALS(name, "Android") && 775 type == NT_ANDROID_MEMTAG && descsz == 4) { 776 static const char *memtag[] = { 777 "none", 778 "async", 779 "sync", 780 "heap", 781 "stack", 782 }; 783 uint32_t desc; 784 size_t i; 785 int did = 0; 786 787 *flags |= FLAGS_DID_ANDROID_MEMTAG; 788 memcpy(&desc, &nbuf[doff], sizeof(desc)); 789 desc = elf_getu32(swap, desc); 790 791 if (desc && elf_printf(ms, ", Android Memtag: ") == -1) 792 return -1; 793 794 for (i = 0; i < __arraycount(memtag); i++) { 795 if (((1 << CAST(int, i)) & desc) == 0) 796 continue; 797 if (elf_printf(ms, "%s%s", did++ ? "," : "", 798 memtag[i]) == -1) 799 return -1; 800 } 801 return 1; 802 } 803 return 0; 804 } 805 806 file_private int 807 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 808 int swap, uint32_t namesz, uint32_t descsz, 809 size_t noff, size_t doff, int *flags, size_t size, int clazz) 810 { 811 #ifdef ELFCORE 812 char buf[256]; 813 const char *name = RCAST(const char *, &nbuf[noff]); 814 815 int os_style = -1; 816 /* 817 * Sigh. The 2.0.36 kernel in Debian 2.1, at 818 * least, doesn't correctly implement name 819 * sections, in core dumps, as specified by 820 * the "Program Linking" section of "UNIX(R) System 821 * V Release 4 Programmer's Guide: ANSI C and 822 * Programming Support Tools", because my copy 823 * clearly says "The first 'namesz' bytes in 'name' 824 * contain a *null-terminated* [emphasis mine] 825 * character representation of the entry's owner 826 * or originator", but the 2.0.36 kernel code 827 * doesn't include the terminating null in the 828 * name.... 829 */ 830 if ((namesz == 4 && memcmp(name, "CORE", 4) == 0) || 831 NAMEEQUALS(name, "CORE")) { 832 os_style = OS_STYLE_SVR4; 833 } 834 835 if (NAMEEQUALS(name, "FreeBSD")) { 836 os_style = OS_STYLE_FREEBSD; 837 } 838 839 if ((namesz >= 11 && memcmp(name, "NetBSD-CORE", 11) == 0)) { 840 os_style = OS_STYLE_NETBSD; 841 } 842 843 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { 844 if (elf_printf(ms, ", %s-style", os_style_names[os_style]) 845 == -1) 846 return -1; 847 *flags |= FLAGS_DID_CORE_STYLE; 848 *flags |= os_style; 849 } 850 851 switch (os_style) { 852 case OS_STYLE_NETBSD: 853 if (type == NT_NETBSD_CORE_PROCINFO) { 854 char sbuf[512]; 855 struct NetBSD_elfcore_procinfo pi; 856 memset(&pi, 0, sizeof(pi)); 857 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi))); 858 859 if (elf_printf(ms, ", from '%.31s', pid=%u, uid=%u, " 860 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)", 861 file_printable(ms, sbuf, sizeof(sbuf), 862 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)), 863 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)), 864 elf_getu32(swap, pi.cpi_euid), 865 elf_getu32(swap, pi.cpi_egid), 866 elf_getu32(swap, pi.cpi_nlwps), 867 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)), 868 elf_getu32(swap, pi.cpi_signo), 869 elf_getu32(swap, pi.cpi_sigcode)) == -1) 870 return -1; 871 872 *flags |= FLAGS_DID_CORE; 873 return 1; 874 } 875 break; 876 877 case OS_STYLE_FREEBSD: 878 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 879 size_t argoff, pidoff; 880 881 if (clazz == ELFCLASS32) 882 argoff = 4 + 4 + 17; 883 else 884 argoff = 4 + 4 + 8 + 17; 885 if (doff + argoff + 81 <= size) { 886 if (elf_printf(ms, ", from '%.80s'", 887 nbuf + doff + argoff) == -1) 888 return -1; 889 } 890 pidoff = argoff + 81 + 2; 891 if (doff + pidoff + 4 <= size) { 892 if (elf_printf(ms, ", pid=%u", 893 elf_getu32(swap, *RCAST(uint32_t *, (nbuf + 894 doff + pidoff)))) == -1) 895 return -1; 896 } 897 *flags |= FLAGS_DID_CORE; 898 } 899 break; 900 901 default: 902 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { 903 size_t i, j; 904 unsigned char c; 905 /* 906 * Extract the program name. We assume 907 * it to be 16 characters (that's what it 908 * is in SunOS 5.x and Linux). 909 * 910 * Unfortunately, it's at a different offset 911 * in various OSes, so try multiple offsets. 912 * If the characters aren't all printable, 913 * reject it. 914 */ 915 for (i = 0; i < NOFFSETS; i++) { 916 unsigned char *cname, *cp; 917 size_t reloffset = prpsoffsets(i); 918 size_t noffset = doff + reloffset; 919 size_t k; 920 for (j = 0; j < 16; j++, noffset++, 921 reloffset++) { 922 /* 923 * Make sure we're not past 924 * the end of the buffer; if 925 * we are, just give up. 926 */ 927 if (noffset >= size) 928 goto tryanother; 929 930 /* 931 * Make sure we're not past 932 * the end of the contents; 933 * if we are, this obviously 934 * isn't the right offset. 935 */ 936 if (reloffset >= descsz) 937 goto tryanother; 938 939 c = nbuf[noffset]; 940 if (c == '\0') { 941 /* 942 * A '\0' at the 943 * beginning is 944 * obviously wrong. 945 * Any other '\0' 946 * means we're done. 947 */ 948 if (j == 0) 949 goto tryanother; 950 else 951 break; 952 } else { 953 /* 954 * A nonprintable 955 * character is also 956 * wrong. 957 */ 958 if (!isprint(c) || isquote(c)) 959 goto tryanother; 960 } 961 } 962 /* 963 * Well, that worked. 964 */ 965 966 /* 967 * Try next offsets, in case this match is 968 * in the middle of a string. 969 */ 970 for (k = i + 1 ; k < NOFFSETS; k++) { 971 size_t no; 972 int adjust = 1; 973 if (prpsoffsets(k) >= prpsoffsets(i)) 974 continue; 975 /* 976 * pr_fname == pr_psargs - 16 && 977 * non-nul-terminated fname (qemu) 978 */ 979 if (prpsoffsets(k) == 980 prpsoffsets(i) - 16 && j == 16) 981 continue; 982 for (no = doff + prpsoffsets(k); 983 no < doff + prpsoffsets(i); no++) 984 adjust = adjust 985 && isprint(nbuf[no]); 986 if (adjust) 987 i = k; 988 } 989 990 cname = CAST(unsigned char *, 991 &nbuf[doff + prpsoffsets(i)]); 992 for (cp = cname; cp < nbuf + size && *cp 993 && isprint(*cp); cp++) 994 continue; 995 /* 996 * Linux apparently appends a space at the end 997 * of the command line: remove it. 998 */ 999 while (cp > cname && isspace(cp[-1])) 1000 cp--; 1001 if (elf_printf(ms, ", from '%s'", 1002 file_copystr(buf, sizeof(buf), 1003 CAST(size_t, cp - cname), 1004 RCAST(char *, cname))) == -1) 1005 return -1; 1006 *flags |= FLAGS_DID_CORE; 1007 return 1; 1008 1009 tryanother: 1010 ; 1011 } 1012 } 1013 break; 1014 } 1015 #endif 1016 return 0; 1017 } 1018 1019 file_private off_t 1020 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, 1021 off_t off, int num, off_t fsize, uint64_t virtaddr) 1022 { 1023 Elf32_Phdr ph32; 1024 Elf64_Phdr ph64; 1025 1026 /* 1027 * Loop through all the program headers and find the header with 1028 * virtual address in which the "virtaddr" belongs to. 1029 */ 1030 for ( ; num; num--) { 1031 if (pread(fd, xph_addr, xph_sizeof, off) < 1032 CAST(ssize_t, xph_sizeof)) { 1033 if (elf_printf(ms, 1034 ", can't read elf program header at %jd", 1035 (intmax_t)off) == -1) 1036 return -1; 1037 return 0; 1038 1039 } 1040 off += xph_sizeof; 1041 1042 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1043 /* Perhaps warn here */ 1044 continue; 1045 } 1046 1047 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) 1048 return xph_offset + (virtaddr - xph_vaddr); 1049 } 1050 return 0; 1051 } 1052 1053 file_private size_t 1054 get_string_on_virtaddr(struct magic_set *ms, 1055 int swap, int clazz, int fd, off_t ph_off, int ph_num, 1056 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) 1057 { 1058 char *bptr; 1059 off_t offset; 1060 1061 if (buflen == 0) 1062 return 0; 1063 1064 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, 1065 fsize, virtaddr); 1066 if (offset < 0 || 1067 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) { 1068 (void)elf_printf(ms, ", can't read elf string at %jd", 1069 (intmax_t)offset); 1070 return 0; 1071 } 1072 1073 buf[buflen - 1] = '\0'; 1074 1075 /* We expect only printable characters, so return if buffer contains 1076 * non-printable character before the '\0' or just '\0'. */ 1077 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++) 1078 continue; 1079 if (*bptr != '\0') 1080 return 0; 1081 1082 return bptr - buf; 1083 } 1084 1085 1086 /*ARGSUSED*/ 1087 file_private int 1088 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, 1089 int swap, uint32_t namesz __attribute__((__unused__)), 1090 uint32_t descsz __attribute__((__unused__)), 1091 size_t noff __attribute__((__unused__)), size_t doff, 1092 int *flags, size_t size __attribute__((__unused__)), int clazz, 1093 int fd, off_t ph_off, int ph_num, off_t fsize) 1094 { 1095 #ifdef ELFCORE 1096 Aux32Info auxv32; 1097 Aux64Info auxv64; 1098 size_t elsize = xauxv_sizeof; 1099 const char *tag; 1100 int is_string; 1101 size_t nval, off; 1102 1103 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != 1104 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) 1105 return 0; 1106 1107 switch (*flags & FLAGS_CORE_STYLE) { 1108 case OS_STYLE_SVR4: 1109 if (type != NT_AUXV) 1110 return 0; 1111 break; 1112 #ifdef notyet 1113 case OS_STYLE_NETBSD: 1114 if (type != NT_NETBSD_CORE_AUXV) 1115 return 0; 1116 break; 1117 case OS_STYLE_FREEBSD: 1118 if (type != NT_FREEBSD_PROCSTAT_AUXV) 1119 return 0; 1120 break; 1121 #endif 1122 default: 1123 return 0; 1124 } 1125 1126 *flags |= FLAGS_DID_AUXV; 1127 1128 nval = 0; 1129 for (off = 0; off + elsize <= descsz; off += elsize) { 1130 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); 1131 /* Limit processing to 50 vector entries to prevent DoS */ 1132 if (nval++ >= 50) { 1133 file_error(ms, 0, "Too many ELF Auxv elements"); 1134 return 1; 1135 } 1136 1137 switch(xauxv_type) { 1138 case AT_LINUX_EXECFN: 1139 is_string = 1; 1140 tag = "execfn"; 1141 break; 1142 case AT_LINUX_PLATFORM: 1143 is_string = 1; 1144 tag = "platform"; 1145 break; 1146 case AT_LINUX_UID: 1147 is_string = 0; 1148 tag = "real uid"; 1149 break; 1150 case AT_LINUX_GID: 1151 is_string = 0; 1152 tag = "real gid"; 1153 break; 1154 case AT_LINUX_EUID: 1155 is_string = 0; 1156 tag = "effective uid"; 1157 break; 1158 case AT_LINUX_EGID: 1159 is_string = 0; 1160 tag = "effective gid"; 1161 break; 1162 default: 1163 is_string = 0; 1164 tag = NULL; 1165 break; 1166 } 1167 1168 if (tag == NULL) 1169 continue; 1170 1171 if (is_string) { 1172 char buf[256]; 1173 ssize_t buflen; 1174 buflen = get_string_on_virtaddr(ms, swap, clazz, fd, 1175 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); 1176 1177 if (buflen == 0) 1178 continue; 1179 1180 if (elf_printf(ms, ", %s: '%s'", tag, buf) == -1) 1181 return -1; 1182 } else { 1183 if (elf_printf(ms, ", %s: %d", tag, 1184 CAST(int, xauxv_val)) == -1) 1185 return -1; 1186 } 1187 } 1188 return 1; 1189 #else 1190 return 0; 1191 #endif 1192 } 1193 1194 file_private size_t 1195 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1196 int clazz, int swap, int *pie, size_t *need) 1197 { 1198 Elf32_Dyn dh32; 1199 Elf64_Dyn dh64; 1200 unsigned char *dbuf = CAST(unsigned char *, vbuf); 1201 1202 if (xdh_sizeof + offset > size) { 1203 /* 1204 * We're out of note headers. 1205 */ 1206 return xdh_sizeof + offset; 1207 } 1208 1209 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof); 1210 offset += xdh_sizeof; 1211 1212 switch (xdh_tag) { 1213 case DT_FLAGS_1: 1214 if (xdh_val & DF_1_PIE) { 1215 *pie = 1; 1216 ms->mode |= 0111; 1217 } else 1218 ms->mode &= ~0111; 1219 break; 1220 case DT_NEEDED: 1221 (*need)++; 1222 break; 1223 default: 1224 break; 1225 } 1226 return offset; 1227 } 1228 1229 1230 file_private size_t 1231 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, 1232 int clazz, int swap, size_t align, int *flags, uint16_t *notecount, 1233 int fd, off_t ph_off, int ph_num, off_t fsize) 1234 { 1235 Elf32_Nhdr nh32; 1236 Elf64_Nhdr nh64; 1237 size_t noff, doff; 1238 uint32_t namesz, descsz; 1239 char buf[256]; 1240 unsigned char *nbuf = CAST(unsigned char *, vbuf); 1241 1242 if (*notecount == 0) 1243 return 0; 1244 --*notecount; 1245 1246 if (xnh_sizeof + offset > size) { 1247 /* 1248 * We're out of note headers. 1249 */ 1250 return xnh_sizeof + offset; 1251 } 1252 /*XXX: GCC */ 1253 memset(&nh32, 0, sizeof(nh32)); 1254 memset(&nh64, 0, sizeof(nh64)); 1255 1256 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); 1257 offset += xnh_sizeof; 1258 1259 namesz = xnh_namesz; 1260 descsz = xnh_descsz; 1261 1262 if ((namesz == 0) && (descsz == 0)) { 1263 /* 1264 * We're out of note headers. 1265 */ 1266 return (offset >= size) ? offset : size; 1267 } 1268 1269 if (namesz & 0x80000000) { 1270 (void)elf_printf(ms, ", bad note name size %#lx", 1271 CAST(unsigned long, namesz)); 1272 return 0; 1273 } 1274 1275 if (descsz & 0x80000000) { 1276 (void)elf_printf(ms, ", bad note description size %#lx", 1277 CAST(unsigned long, descsz)); 1278 return 0; 1279 } 1280 1281 noff = offset; 1282 doff = ELF_ALIGN(offset + namesz); 1283 1284 if (offset + namesz > size) { 1285 /* 1286 * We're past the end of the buffer. 1287 */ 1288 return doff; 1289 } 1290 1291 offset = ELF_ALIGN(doff + descsz); 1292 if (doff + descsz > size) { 1293 /* 1294 * We're past the end of the buffer. 1295 */ 1296 return (offset >= size) ? offset : size; 1297 } 1298 1299 1300 if ((*flags & FLAGS_DID_OS_NOTE) == 0) { 1301 if (do_os_note(ms, nbuf, xnh_type, swap, 1302 namesz, descsz, noff, doff, flags)) 1303 return offset; 1304 } 1305 1306 if ((*flags & FLAGS_DID_BUILD_ID) == 0) { 1307 if (do_bid_note(ms, nbuf, xnh_type, swap, 1308 namesz, descsz, noff, doff, flags)) 1309 return offset; 1310 } 1311 1312 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { 1313 if (do_pax_note(ms, nbuf, xnh_type, swap, 1314 namesz, descsz, noff, doff, flags)) 1315 return offset; 1316 } 1317 if ((*flags & FLAGS_DID_ANDROID_MEMTAG) == 0) { 1318 if (do_memtag_note(ms, nbuf, xnh_type, swap, 1319 namesz, descsz, noff, doff, flags)) 1320 return offset; 1321 } 1322 1323 if ((*flags & FLAGS_DID_CORE) == 0) { 1324 if (do_core_note(ms, nbuf, xnh_type, swap, 1325 namesz, descsz, noff, doff, flags, size, clazz)) 1326 return offset; 1327 } 1328 1329 if ((*flags & FLAGS_DID_AUXV) == 0) { 1330 if (do_auxv_note(ms, nbuf, xnh_type, swap, 1331 namesz, descsz, noff, doff, flags, size, clazz, 1332 fd, ph_off, ph_num, fsize)) 1333 return offset; 1334 } 1335 1336 if (NAMEEQUALS(RCAST(char *, &nbuf[noff]), "NetBSD")) { 1337 int descw, flag; 1338 const char *str, *tag; 1339 if (descsz > 100) 1340 descsz = 100; 1341 switch (xnh_type) { 1342 case NT_NETBSD_VERSION: 1343 return offset; 1344 case NT_NETBSD_MARCH: 1345 flag = FLAGS_DID_NETBSD_MARCH; 1346 tag = "compiled for"; 1347 break; 1348 case NT_NETBSD_CMODEL: 1349 flag = FLAGS_DID_NETBSD_CMODEL; 1350 tag = "compiler model"; 1351 break; 1352 case NT_NETBSD_EMULATION: 1353 flag = FLAGS_DID_NETBSD_EMULATION; 1354 tag = "emulation:"; 1355 break; 1356 default: 1357 if (*flags & FLAGS_DID_NETBSD_UNKNOWN) 1358 return offset; 1359 *flags |= FLAGS_DID_NETBSD_UNKNOWN; 1360 if (elf_printf(ms, ", note=%u", xnh_type) == -1) 1361 return offset; 1362 return offset; 1363 } 1364 1365 if (*flags & flag) 1366 return offset; 1367 str = RCAST(const char *, &nbuf[doff]); 1368 descw = CAST(int, descsz); 1369 *flags |= flag; 1370 elf_printf(ms, ", %s: %s", tag, 1371 file_copystr(buf, sizeof(buf), descw, str)); 1372 return offset; 1373 } 1374 1375 return offset; 1376 } 1377 1378 /* SunOS 5.x hardware capability descriptions */ 1379 typedef struct cap_desc { 1380 uint64_t cd_mask; 1381 const char *cd_name; 1382 } cap_desc_t; 1383 1384 static const cap_desc_t cap_desc_sparc[] = { 1385 { AV_SPARC_MUL32, "MUL32" }, 1386 { AV_SPARC_DIV32, "DIV32" }, 1387 { AV_SPARC_FSMULD, "FSMULD" }, 1388 { AV_SPARC_V8PLUS, "V8PLUS" }, 1389 { AV_SPARC_POPC, "POPC" }, 1390 { AV_SPARC_VIS, "VIS" }, 1391 { AV_SPARC_VIS2, "VIS2" }, 1392 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, 1393 { AV_SPARC_FMAF, "FMAF" }, 1394 { AV_SPARC_FJFMAU, "FJFMAU" }, 1395 { AV_SPARC_IMA, "IMA" }, 1396 { 0, NULL } 1397 }; 1398 1399 static const cap_desc_t cap_desc_386[] = { 1400 { AV_386_FPU, "FPU" }, 1401 { AV_386_TSC, "TSC" }, 1402 { AV_386_CX8, "CX8" }, 1403 { AV_386_SEP, "SEP" }, 1404 { AV_386_AMD_SYSC, "AMD_SYSC" }, 1405 { AV_386_CMOV, "CMOV" }, 1406 { AV_386_MMX, "MMX" }, 1407 { AV_386_AMD_MMX, "AMD_MMX" }, 1408 { AV_386_AMD_3DNow, "AMD_3DNow" }, 1409 { AV_386_AMD_3DNowx, "AMD_3DNowx" }, 1410 { AV_386_FXSR, "FXSR" }, 1411 { AV_386_SSE, "SSE" }, 1412 { AV_386_SSE2, "SSE2" }, 1413 { AV_386_PAUSE, "PAUSE" }, 1414 { AV_386_SSE3, "SSE3" }, 1415 { AV_386_MON, "MON" }, 1416 { AV_386_CX16, "CX16" }, 1417 { AV_386_AHF, "AHF" }, 1418 { AV_386_TSCP, "TSCP" }, 1419 { AV_386_AMD_SSE4A, "AMD_SSE4A" }, 1420 { AV_386_POPCNT, "POPCNT" }, 1421 { AV_386_AMD_LZCNT, "AMD_LZCNT" }, 1422 { AV_386_SSSE3, "SSSE3" }, 1423 { AV_386_SSE4_1, "SSE4.1" }, 1424 { AV_386_SSE4_2, "SSE4.2" }, 1425 { 0, NULL } 1426 }; 1427 1428 file_private int 1429 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, 1430 size_t size, off_t fsize, int mach, int strtab, int *flags, 1431 uint16_t *notecount) 1432 { 1433 Elf32_Shdr sh32; 1434 Elf64_Shdr sh64; 1435 int stripped = 1, has_debug_info = 0; 1436 size_t nbadcap = 0; 1437 void *nbuf; 1438 off_t noff, coff, name_off, offs; 1439 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ 1440 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ 1441 char name[50]; 1442 ssize_t namesize; 1443 1444 if (ms->flags & MAGIC_MIME) 1445 return 0; 1446 1447 if (num == 0) { 1448 if (elf_printf(ms, ", no section header") == -1) 1449 return -1; 1450 return 0; 1451 } 1452 if (size != xsh_sizeof) { 1453 if (elf_printf(ms, ", corrupted section header size") == -1) 1454 return -1; 1455 return 0; 1456 } 1457 1458 /* Read offset of name section to be able to read section names later */ 1459 offs = CAST(off_t, (off + size * strtab)); 1460 if (pread(fd, xsh_addr, xsh_sizeof, offs) < CAST(ssize_t, xsh_sizeof)) { 1461 if (elf_printf(ms, ", missing section headers at %jd", 1462 (intmax_t)offs) == -1) 1463 return -1; 1464 return 0; 1465 } 1466 name_off = xsh_offset; 1467 1468 if (fsize != SIZE_UNKNOWN && fsize < name_off) { 1469 if (elf_printf(ms, ", too large section header offset %jd", 1470 (intmax_t)name_off) == -1) 1471 return -1; 1472 return 0; 1473 } 1474 1475 for ( ; num; num--) { 1476 /* Read the name of this section. */ 1477 offs = name_off + xsh_name; 1478 if ((namesize = pread(fd, name, sizeof(name) - 1, offs)) 1479 == -1) { 1480 if (elf_printf(ms, 1481 ", can't read name of elf section at %jd", 1482 (intmax_t)offs) == -1) 1483 return -1; 1484 return 0; 1485 } 1486 name[namesize] = '\0'; 1487 if (strcmp(name, ".debug_info") == 0) { 1488 has_debug_info = 1; 1489 stripped = 0; 1490 } 1491 1492 if (pread(fd, xsh_addr, xsh_sizeof, off) < 1493 CAST(ssize_t, xsh_sizeof)) { 1494 if (elf_printf(ms, ", can't read elf section at %jd", 1495 (intmax_t)off) == -1) 1496 return -1; 1497 return 0; 1498 } 1499 off += size; 1500 1501 /* Things we can determine before we seek */ 1502 switch (xsh_type) { 1503 case SHT_SYMTAB: 1504 #if 0 1505 case SHT_DYNSYM: 1506 #endif 1507 stripped = 0; 1508 break; 1509 default: 1510 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { 1511 /* Perhaps warn here */ 1512 continue; 1513 } 1514 break; 1515 } 1516 1517 1518 /* Things we can determine when we seek */ 1519 switch (xsh_type) { 1520 case SHT_NOTE: 1521 if (CAST(uintmax_t, (xsh_size + xsh_offset)) > 1522 CAST(uintmax_t, fsize)) { 1523 if (elf_printf(ms, 1524 ", note offset/size %#" INTMAX_T_FORMAT 1525 "x+%#" INTMAX_T_FORMAT "x exceeds" 1526 " file size %#" INTMAX_T_FORMAT "x", 1527 CAST(uintmax_t, xsh_offset), 1528 CAST(uintmax_t, xsh_size), 1529 CAST(uintmax_t, fsize)) == -1) 1530 return -1; 1531 return 0; 1532 } 1533 if (xsh_size > ms->elf_shsize_max) { 1534 file_error(ms, errno, "Note section size too " 1535 "big (%ju > %zu)", (uintmax_t)xsh_size, 1536 ms->elf_shsize_max); 1537 return -1; 1538 } 1539 if ((nbuf = malloc(xsh_size)) == NULL) { 1540 file_error(ms, errno, "Cannot allocate memory" 1541 " for note"); 1542 return -1; 1543 } 1544 offs = xsh_offset; 1545 if (pread(fd, nbuf, xsh_size, offs) < 1546 CAST(ssize_t, xsh_size)) { 1547 free(nbuf); 1548 if (elf_printf(ms, 1549 ", can't read elf note at %jd", 1550 (intmax_t)offs) == -1) 1551 return -1; 1552 return 0; 1553 } 1554 1555 noff = 0; 1556 for (;;) { 1557 if (noff >= CAST(off_t, xsh_size)) 1558 break; 1559 noff = donote(ms, nbuf, CAST(size_t, noff), 1560 xsh_size, clazz, swap, 4, flags, notecount, 1561 fd, 0, 0, 0); 1562 if (noff == 0) 1563 break; 1564 } 1565 free(nbuf); 1566 break; 1567 case SHT_SUNW_cap: 1568 switch (mach) { 1569 case EM_SPARC: 1570 case EM_SPARCV9: 1571 case EM_IA_64: 1572 case EM_386: 1573 case EM_AMD64: 1574 break; 1575 default: 1576 goto skip; 1577 } 1578 1579 if (nbadcap > 5) 1580 break; 1581 if (lseek(fd, xsh_offset, SEEK_SET) 1582 == CAST(off_t, -1)) { 1583 file_badseek(ms); 1584 return -1; 1585 } 1586 coff = 0; 1587 for (;;) { 1588 Elf32_Cap cap32; 1589 Elf64_Cap cap64; 1590 cap32.c_un.c_val = 0; 1591 cap64.c_un.c_val = 0; 1592 char cbuf[/*CONSTCOND*/ 1593 MAX(sizeof(cap32), sizeof(cap64))]; 1594 if ((coff += xcap_sizeof) > 1595 CAST(off_t, xsh_size)) 1596 break; 1597 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) != 1598 CAST(ssize_t, xcap_sizeof)) { 1599 file_badread(ms); 1600 return -1; 1601 } 1602 if (cbuf[0] == 'A') { 1603 #ifdef notyet 1604 char *p = cbuf + 1; 1605 uint32_t len, tag; 1606 memcpy(&len, p, sizeof(len)); 1607 p += 4; 1608 len = getu32(swap, len); 1609 if (memcmp("gnu", p, 3) != 0) { 1610 if (elf_printf(ms, 1611 ", unknown capability %.3s", p) 1612 == -1) 1613 return -1; 1614 break; 1615 } 1616 p += strlen(p) + 1; 1617 tag = *p++; 1618 memcpy(&len, p, sizeof(len)); 1619 p += 4; 1620 len = getu32(swap, len); 1621 if (tag != 1) { 1622 if (elf_printf(ms, ", unknown gnu" 1623 " capability tag %d", tag) 1624 == -1) 1625 return -1; 1626 break; 1627 } 1628 // gnu attributes 1629 #endif 1630 break; 1631 } 1632 memcpy(xcap_addr, cbuf, xcap_sizeof); 1633 switch (xcap_tag) { 1634 case CA_SUNW_NULL: 1635 break; 1636 case CA_SUNW_HW_1: 1637 cap_hw1 |= xcap_val; 1638 break; 1639 case CA_SUNW_SF_1: 1640 cap_sf1 |= xcap_val; 1641 break; 1642 default: 1643 if (elf_printf(ms, 1644 ", with unknown capability " 1645 "%#" INT64_T_FORMAT "x = %#" 1646 INT64_T_FORMAT "x", 1647 CAST(unsigned long long, xcap_tag), 1648 CAST(unsigned long long, xcap_val)) 1649 == -1) 1650 return -1; 1651 if (nbadcap++ > 2) 1652 goto skip; 1653 break; 1654 } 1655 } 1656 /*FALLTHROUGH*/ 1657 skip: 1658 default: 1659 break; 1660 } 1661 } 1662 1663 if (has_debug_info) { 1664 if (elf_printf(ms, ", with debug_info") == -1) 1665 return -1; 1666 } 1667 if (elf_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) 1668 return -1; 1669 if (cap_hw1) { 1670 const cap_desc_t *cdp; 1671 switch (mach) { 1672 case EM_SPARC: 1673 case EM_SPARC32PLUS: 1674 case EM_SPARCV9: 1675 cdp = cap_desc_sparc; 1676 break; 1677 case EM_386: 1678 case EM_IA_64: 1679 case EM_AMD64: 1680 cdp = cap_desc_386; 1681 break; 1682 default: 1683 cdp = NULL; 1684 break; 1685 } 1686 if (elf_printf(ms, ", uses") == -1) 1687 return -1; 1688 if (cdp) { 1689 while (cdp->cd_name) { 1690 if (cap_hw1 & cdp->cd_mask) { 1691 if (elf_printf(ms, 1692 " %s", cdp->cd_name) == -1) 1693 return -1; 1694 cap_hw1 &= ~cdp->cd_mask; 1695 } 1696 ++cdp; 1697 } 1698 if (cap_hw1) 1699 if (elf_printf(ms, 1700 " unknown hardware capability %#" 1701 INT64_T_FORMAT "x", 1702 CAST(unsigned long long, cap_hw1)) == -1) 1703 return -1; 1704 } else { 1705 if (elf_printf(ms, 1706 " hardware capability %#" INT64_T_FORMAT "x", 1707 CAST(unsigned long long, cap_hw1)) == -1) 1708 return -1; 1709 } 1710 } 1711 if (cap_sf1) { 1712 if (cap_sf1 & SF1_SUNW_FPUSED) { 1713 if (elf_printf(ms, 1714 (cap_sf1 & SF1_SUNW_FPKNWN) 1715 ? ", uses frame pointer" 1716 : ", not known to use frame pointer") == -1) 1717 return -1; 1718 } 1719 cap_sf1 &= ~SF1_SUNW_MASK; 1720 if (cap_sf1) 1721 if (elf_printf(ms, 1722 ", with unknown software capability %#" 1723 INT64_T_FORMAT "x", 1724 CAST(unsigned long long, cap_sf1)) == -1) 1725 return -1; 1726 } 1727 return 0; 1728 } 1729 1730 /* 1731 * Look through the program headers of an executable image, to determine 1732 * if it is statically or dynamically linked. If it has a dynamic section, 1733 * it is pie, and does not have an interpreter or needed libraries, we 1734 * call it static pie. 1735 */ 1736 file_private int 1737 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, 1738 int num, size_t size, off_t fsize, int sh_num, int *flags, 1739 uint16_t *notecount) 1740 { 1741 Elf32_Phdr ph32; 1742 Elf64_Phdr ph64; 1743 const char *str; 1744 unsigned char nbuf[NBUFSIZE]; 1745 char interp[NBUFSIZE]; 1746 ssize_t bufsize; 1747 size_t offset, align, need = 0; 1748 int pie = 0, dynamic = 0; 1749 1750 if (num == 0) { 1751 if (elf_printf(ms, ", no program header") == -1) 1752 return -1; 1753 return 0; 1754 } 1755 if (size != xph_sizeof) { 1756 if (elf_printf(ms, ", corrupted program header size") == -1) 1757 return -1; 1758 return 0; 1759 } 1760 1761 interp[0] = '\0'; 1762 for ( ; num; num--) { 1763 int doread; 1764 if (pread(fd, xph_addr, xph_sizeof, off) < 1765 CAST(ssize_t, xph_sizeof)) { 1766 if (elf_printf(ms, 1767 ", can't read elf program headers at %jd", 1768 (intmax_t)off) == -1) 1769 return -1; 1770 return 0; 1771 } 1772 1773 off += size; 1774 bufsize = 0; 1775 align = 4; 1776 1777 /* Things we can determine before we seek */ 1778 switch (xph_type) { 1779 case PT_DYNAMIC: 1780 doread = 1; 1781 break; 1782 case PT_NOTE: 1783 if (sh_num) /* Did this through section headers */ 1784 continue; 1785 if (((align = xph_align) & 0x80000000UL) != 0 || 1786 align < 4) { 1787 if (elf_printf(ms, 1788 ", invalid note alignment %#lx", 1789 CAST(unsigned long, align)) == -1) 1790 return -1; 1791 align = 4; 1792 } 1793 /*FALLTHROUGH*/ 1794 case PT_INTERP: 1795 doread = 1; 1796 break; 1797 default: 1798 doread = 0; 1799 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { 1800 /* Maybe warn here? */ 1801 continue; 1802 } 1803 break; 1804 } 1805 1806 if (doread) { 1807 size_t len = xph_filesz < sizeof(nbuf) ? xph_filesz 1808 : sizeof(nbuf); 1809 off_t offs = xph_offset; 1810 bufsize = pread(fd, nbuf, len, offs); 1811 if (bufsize == -1) { 1812 if (elf_printf(ms, 1813 ", can't read section at %jd", 1814 (intmax_t)offs) == -1) 1815 return -1; 1816 return 0; 1817 } 1818 } 1819 1820 /* Things we can determine when we seek */ 1821 switch (xph_type) { 1822 case PT_DYNAMIC: 1823 dynamic = 1; 1824 offset = 0; 1825 // Let DF_1 determine if we are PIE or not. 1826 ms->mode &= ~0111; 1827 for (;;) { 1828 if (offset >= CAST(size_t, bufsize)) 1829 break; 1830 offset = dodynamic(ms, nbuf, offset, 1831 CAST(size_t, bufsize), clazz, swap, 1832 &pie, &need); 1833 if (offset == 0) 1834 break; 1835 } 1836 break; 1837 1838 case PT_INTERP: 1839 need++; 1840 if (ms->flags & MAGIC_MIME) 1841 continue; 1842 if (bufsize && nbuf[0]) { 1843 nbuf[bufsize - 1] = '\0'; 1844 str = RCAST(const char *, nbuf); 1845 } else 1846 str = "*empty*"; 1847 strlcpy(interp, str, sizeof(interp)); 1848 break; 1849 case PT_NOTE: 1850 if (ms->flags & MAGIC_MIME) 1851 return 0; 1852 /* 1853 * This is a PT_NOTE section; loop through all the notes 1854 * in the section. 1855 */ 1856 offset = 0; 1857 for (;;) { 1858 if (offset >= CAST(size_t, bufsize)) 1859 break; 1860 offset = donote(ms, nbuf, offset, 1861 CAST(size_t, bufsize), clazz, swap, align, 1862 flags, notecount, fd, 0, 0, 0); 1863 if (offset == 0) 1864 break; 1865 } 1866 break; 1867 default: 1868 if (ms->flags & MAGIC_MIME) 1869 continue; 1870 break; 1871 } 1872 } 1873 if (ms->flags & MAGIC_MIME) 1874 return 0; 1875 if (dynamic) { 1876 if (pie && need == 0) 1877 str = "static-pie"; 1878 else 1879 str = "dynamically"; 1880 } else { 1881 str = "statically"; 1882 } 1883 if (elf_printf(ms, ", %s linked", str) == -1) 1884 return -1; 1885 if (interp[0]) 1886 if (elf_printf(ms, ", interpreter %s", file_printable(ms, 1887 RCAST(char *, nbuf), sizeof(nbuf), 1888 interp, sizeof(interp))) == -1) 1889 return -1; 1890 return 0; 1891 } 1892 1893 1894 file_protected int 1895 file_tryelf(struct magic_set *ms, const struct buffer *b) 1896 { 1897 int fd = b->fd; 1898 const unsigned char *buf = CAST(const unsigned char *, b->fbuf); 1899 size_t nbytes = b->flen; 1900 union { 1901 int32_t l; 1902 char c[sizeof(int32_t)]; 1903 } u; 1904 int clazz; 1905 int swap; 1906 struct stat st; 1907 const struct stat *stp; 1908 off_t fsize; 1909 int flags = 0; 1910 Elf32_Ehdr elf32hdr; 1911 Elf64_Ehdr elf64hdr; 1912 uint16_t type, phnum, shnum, notecount; 1913 1914 if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION)) 1915 return 0; 1916 /* 1917 * ELF executables have multiple section headers in arbitrary 1918 * file locations and thus file(1) cannot determine it from easily. 1919 * Instead we traverse thru all section headers until a symbol table 1920 * one is found or else the binary is stripped. 1921 * Return immediately if it's not ELF (so we avoid pipe2file unless 1922 * needed). 1923 */ 1924 if (buf[EI_MAG0] != ELFMAG0 1925 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) 1926 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) 1927 return 0; 1928 1929 /* 1930 * If we cannot seek, it must be a pipe, socket or fifo. 1931 */ 1932 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) 1933 && (errno == ESPIPE)) 1934 fd = file_pipe2file(ms, fd, buf, nbytes); 1935 1936 if (fd == -1) { 1937 file_badread(ms); 1938 return -1; 1939 } 1940 1941 stp = &b->st; 1942 /* 1943 * b->st.st_size != 0 if previous fstat() succeeded, 1944 * which is likely, we can avoid extra stat() call. 1945 */ 1946 if (b->st.st_size == 0) { 1947 stp = &st; 1948 if (fstat(fd, &st) == -1) { 1949 file_badread(ms); 1950 return -1; 1951 } 1952 } 1953 if (S_ISREG(stp->st_mode) || stp->st_size != 0) 1954 fsize = stp->st_size; 1955 else 1956 fsize = SIZE_UNKNOWN; 1957 1958 clazz = buf[EI_CLASS]; 1959 1960 switch (clazz) { 1961 case ELFCLASS32: 1962 #undef elf_getu 1963 #define elf_getu(a, b) elf_getu32(a, b) 1964 #undef elfhdr 1965 #define elfhdr elf32hdr 1966 #include "elfclass.h" 1967 case ELFCLASS64: 1968 #undef elf_getu 1969 #define elf_getu(a, b) elf_getu64(a, b) 1970 #undef elfhdr 1971 #define elfhdr elf64hdr 1972 #include "elfclass.h" 1973 default: 1974 if (elf_printf(ms, ", unknown class %d", clazz) == -1) 1975 return -1; 1976 break; 1977 } 1978 return 0; 1979 } 1980 #endif 1981