1 /* $NetBSD: subr_msan.c,v 1.14 2020/09/09 16:29:59 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2019-2020 Maxime Villard, m00nbsd.net 5 * All rights reserved. 6 * Copyright (c) 2021 The FreeBSD Foundation 7 * 8 * Portions of this software were developed by Mark Johnston under sponsorship 9 * from the FreeBSD Foundation. 10 * 11 * This code is part of the KMSAN subsystem of the NetBSD kernel. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #define SAN_RUNTIME 36 37 #include <sys/cdefs.h> 38 #if 0 39 __KERNEL_RCSID(0, "$NetBSD: subr_msan.c,v 1.14 2020/09/09 16:29:59 maxv Exp $"); 40 #endif 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/bio.h> 45 #include <sys/buf.h> 46 #include <sys/conf.h> 47 #include <sys/kdb.h> 48 #include <sys/kernel.h> 49 #include <sys/linker.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/memdesc.h> 53 #include <sys/msan.h> 54 #include <sys/proc.h> 55 #include <sys/stack.h> 56 #include <sys/sysctl.h> 57 #include <sys/uio.h> 58 59 #include <vm/vm.h> 60 #include <vm/pmap.h> 61 62 #include <machine/msan.h> 63 #include <machine/stdarg.h> 64 65 void kmsan_init_arg(size_t); 66 void kmsan_init_ret(size_t); 67 68 /* -------------------------------------------------------------------------- */ 69 70 /* 71 * Part of the compiler ABI. 72 */ 73 74 typedef struct { 75 uint8_t *shad; 76 msan_orig_t *orig; 77 } msan_meta_t; 78 79 #define MSAN_PARAM_SIZE 800 80 #define MSAN_RETVAL_SIZE 800 81 typedef struct { 82 uint8_t param_shadow[MSAN_PARAM_SIZE]; 83 uint8_t retval_shadow[MSAN_RETVAL_SIZE]; 84 uint8_t va_arg_shadow[MSAN_PARAM_SIZE]; 85 uint8_t va_arg_origin[MSAN_PARAM_SIZE]; 86 uint64_t va_arg_overflow_size; 87 msan_orig_t param_origin[MSAN_PARAM_SIZE / sizeof(msan_orig_t)]; 88 msan_orig_t retval_origin; 89 } msan_tls_t; 90 91 /* -------------------------------------------------------------------------- */ 92 93 #define MSAN_NCONTEXT 4 94 #define MSAN_ORIG_MASK (~0x3) 95 96 typedef struct kmsan_td { 97 size_t ctx; 98 msan_tls_t tls[MSAN_NCONTEXT]; 99 } msan_td_t; 100 101 static msan_tls_t dummy_tls; 102 103 /* 104 * Use separate dummy regions for loads and stores: stores may mark the region 105 * as uninitialized, and that can trigger false positives. 106 */ 107 static uint8_t msan_dummy_shad[PAGE_SIZE] __aligned(PAGE_SIZE); 108 static uint8_t msan_dummy_write_shad[PAGE_SIZE] __aligned(PAGE_SIZE); 109 static uint8_t msan_dummy_orig[PAGE_SIZE] __aligned(PAGE_SIZE); 110 static msan_td_t msan_thread0; 111 static bool kmsan_reporting = false; 112 113 /* 114 * Avoid clobbering any thread-local state before we panic. 115 */ 116 #define kmsan_panic(f, ...) do { \ 117 kmsan_disabled = true; \ 118 panic(f, __VA_ARGS__); \ 119 } while (0) 120 121 #define REPORT(f, ...) do { \ 122 if (panic_on_violation) { \ 123 kmsan_panic(f, __VA_ARGS__); \ 124 } else { \ 125 struct stack st; \ 126 \ 127 stack_save(&st); \ 128 printf(f "\n", __VA_ARGS__); \ 129 stack_print_ddb(&st); \ 130 } \ 131 } while (0) 132 133 FEATURE(kmsan, "Kernel memory sanitizer"); 134 135 static SYSCTL_NODE(_debug, OID_AUTO, kmsan, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 136 "KMSAN options"); 137 138 static bool panic_on_violation = 1; 139 SYSCTL_BOOL(_debug_kmsan, OID_AUTO, panic_on_violation, CTLFLAG_RWTUN, 140 &panic_on_violation, 0, 141 "Panic if an invalid access is detected"); 142 143 static bool kmsan_disabled __read_mostly = true; 144 #define kmsan_enabled (!kmsan_disabled) 145 SYSCTL_BOOL(_debug_kmsan, OID_AUTO, disabled, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, 146 &kmsan_disabled, 0, "KMSAN is disabled"); 147 148 static MALLOC_DEFINE(M_KMSAN, "kmsan", "Kernel memory sanitizer"); 149 150 /* -------------------------------------------------------------------------- */ 151 152 static inline const char * 153 kmsan_orig_name(int type) 154 { 155 switch (type) { 156 case KMSAN_TYPE_STACK: 157 return ("stack"); 158 case KMSAN_TYPE_KMEM: 159 return ("kmem"); 160 case KMSAN_TYPE_MALLOC: 161 return ("malloc"); 162 case KMSAN_TYPE_UMA: 163 return ("UMA"); 164 default: 165 return ("unknown"); 166 } 167 } 168 169 static void 170 kmsan_report_hook(const void *addr, msan_orig_t *orig, size_t size, size_t off, 171 const char *hook) 172 { 173 const char *typename; 174 char *var, *fn; 175 uintptr_t ptr; 176 long foff; 177 char buf[128]; 178 int type; 179 180 if (__predict_false(KERNEL_PANICKED() || kdb_active || kmsan_reporting)) 181 return; 182 if (__predict_false(curthread != NULL && 183 (curthread->td_pflags2 & TDP2_SAN_QUIET) != 0)) 184 return; 185 186 kmsan_reporting = true; 187 __compiler_membar(); 188 189 if (*orig == 0) { 190 REPORT("MSan: Uninitialized memory in %s, offset %zu", 191 hook, off); 192 goto out; 193 } 194 195 kmsan_md_orig_decode(*orig, &type, &ptr); 196 typename = kmsan_orig_name(type); 197 198 if (linker_ddb_search_symbol_name((caddr_t)ptr, buf, 199 sizeof(buf), &foff) == 0) { 200 REPORT("MSan: Uninitialized %s memory in %s, " 201 "offset %zu/%zu, addr %p, from %s+%#lx", 202 typename, hook, off, size, addr, buf, foff); 203 } else if (__builtin_memcmp((void *)ptr, "----", 4) == 0) { 204 /* 205 * The format of the string is: "----var@function". Parse it to 206 * display a nice warning. 207 */ 208 var = (char *)ptr + 4; 209 strlcpy(buf, var, sizeof(buf)); 210 var = buf; 211 fn = strchr(buf, '@'); 212 *fn++ = '\0'; 213 REPORT("MSan: Uninitialized %s memory in %s, offset %zu, " 214 "variable '%s' from %s", typename, hook, off, var, fn); 215 } else { 216 REPORT("MSan: Uninitialized %s memory in %s, " 217 "offset %zu/%zu, addr %p, PC %p", 218 typename, hook, off, size, addr, (void *)ptr); 219 } 220 221 out: 222 __compiler_membar(); 223 kmsan_reporting = false; 224 } 225 226 static void 227 kmsan_report_inline(msan_orig_t orig, unsigned long pc) 228 { 229 const char *typename; 230 char *var, *fn; 231 uintptr_t ptr; 232 char buf[128]; 233 long foff; 234 int type; 235 236 if (__predict_false(KERNEL_PANICKED() || kdb_active || kmsan_reporting)) 237 return; 238 if (__predict_false(curthread != NULL && 239 (curthread->td_pflags2 & TDP2_SAN_QUIET) != 0)) 240 return; 241 242 kmsan_reporting = true; 243 __compiler_membar(); 244 245 if (orig == 0) { 246 REPORT("MSan: uninitialized variable in %p", (void *)pc); 247 goto out; 248 } 249 250 kmsan_md_orig_decode(orig, &type, &ptr); 251 typename = kmsan_orig_name(type); 252 253 if (linker_ddb_search_symbol_name((caddr_t)ptr, buf, 254 sizeof(buf), &foff) == 0) { 255 REPORT("MSan: Uninitialized %s memory from %s+%#lx", 256 typename, buf, foff); 257 } else if (__builtin_memcmp((void *)ptr, "----", 4) == 0) { 258 /* 259 * The format of the string is: "----var@function". Parse it to 260 * display a nice warning. 261 */ 262 var = (char *)ptr + 4; 263 strlcpy(buf, var, sizeof(buf)); 264 var = buf; 265 fn = strchr(buf, '@'); 266 *fn++ = '\0'; 267 REPORT("MSan: Uninitialized variable '%s' from %s", var, fn); 268 } else { 269 REPORT("MSan: Uninitialized %s memory, origin %x", 270 typename, orig); 271 } 272 273 out: 274 __compiler_membar(); 275 kmsan_reporting = false; 276 } 277 278 /* -------------------------------------------------------------------------- */ 279 280 static inline msan_meta_t 281 kmsan_meta_get(const void *addr, size_t size, const bool write) 282 { 283 msan_meta_t ret; 284 285 if (__predict_false(!kmsan_enabled)) { 286 ret.shad = write ? msan_dummy_write_shad : msan_dummy_shad; 287 ret.orig = (msan_orig_t *)msan_dummy_orig; 288 } else if (__predict_false(kmsan_md_unsupported((vm_offset_t)addr))) { 289 ret.shad = write ? msan_dummy_write_shad : msan_dummy_shad; 290 ret.orig = (msan_orig_t *)msan_dummy_orig; 291 } else { 292 ret.shad = (void *)kmsan_md_addr_to_shad((vm_offset_t)addr); 293 ret.orig = 294 (msan_orig_t *)kmsan_md_addr_to_orig((vm_offset_t)addr); 295 ret.orig = (msan_orig_t *)((uintptr_t)ret.orig & 296 MSAN_ORIG_MASK); 297 } 298 299 return (ret); 300 } 301 302 static inline void 303 kmsan_origin_fill(const void *addr, msan_orig_t o, size_t size) 304 { 305 msan_orig_t *orig; 306 size_t i; 307 308 if (__predict_false(!kmsan_enabled)) 309 return; 310 if (__predict_false(kmsan_md_unsupported((vm_offset_t)addr))) 311 return; 312 313 orig = (msan_orig_t *)kmsan_md_addr_to_orig((vm_offset_t)addr); 314 size += ((uintptr_t)orig & (sizeof(*orig) - 1)); 315 orig = (msan_orig_t *)((uintptr_t)orig & MSAN_ORIG_MASK); 316 317 for (i = 0; i < size; i += 4) { 318 orig[i / 4] = o; 319 } 320 } 321 322 static inline void 323 kmsan_shadow_fill(uintptr_t addr, uint8_t c, size_t size) 324 { 325 uint8_t *shad; 326 327 if (__predict_false(!kmsan_enabled)) 328 return; 329 if (__predict_false(kmsan_md_unsupported(addr))) 330 return; 331 332 shad = (uint8_t *)kmsan_md_addr_to_shad(addr); 333 __builtin_memset(shad, c, size); 334 } 335 336 static inline void 337 kmsan_meta_copy(void *dst, const void *src, size_t size) 338 { 339 uint8_t *orig_src, *orig_dst; 340 uint8_t *shad_src, *shad_dst; 341 msan_orig_t *_src, *_dst; 342 size_t i; 343 344 if (__predict_false(!kmsan_enabled)) 345 return; 346 if (__predict_false(kmsan_md_unsupported((vm_offset_t)dst))) 347 return; 348 if (__predict_false(kmsan_md_unsupported((vm_offset_t)src))) { 349 kmsan_shadow_fill((uintptr_t)dst, KMSAN_STATE_INITED, size); 350 return; 351 } 352 353 shad_src = (uint8_t *)kmsan_md_addr_to_shad((vm_offset_t)src); 354 shad_dst = (uint8_t *)kmsan_md_addr_to_shad((vm_offset_t)dst); 355 __builtin_memmove(shad_dst, shad_src, size); 356 357 orig_src = (uint8_t *)kmsan_md_addr_to_orig((vm_offset_t)src); 358 orig_dst = (uint8_t *)kmsan_md_addr_to_orig((vm_offset_t)dst); 359 for (i = 0; i < size; i++) { 360 _src = (msan_orig_t *)((uintptr_t)orig_src & MSAN_ORIG_MASK); 361 _dst = (msan_orig_t *)((uintptr_t)orig_dst & MSAN_ORIG_MASK); 362 *_dst = *_src; 363 orig_src++; 364 orig_dst++; 365 } 366 } 367 368 static inline void 369 kmsan_shadow_check(uintptr_t addr, size_t size, const char *hook) 370 { 371 msan_orig_t *orig; 372 uint8_t *shad; 373 size_t i; 374 375 if (__predict_false(!kmsan_enabled)) 376 return; 377 if (__predict_false(kmsan_md_unsupported(addr))) 378 return; 379 380 shad = (uint8_t *)kmsan_md_addr_to_shad(addr); 381 for (i = 0; i < size; i++) { 382 if (__predict_true(shad[i] == 0)) 383 continue; 384 orig = (msan_orig_t *)kmsan_md_addr_to_orig(addr + i); 385 orig = (msan_orig_t *)((uintptr_t)orig & MSAN_ORIG_MASK); 386 kmsan_report_hook((const char *)addr + i, orig, size, i, hook); 387 break; 388 } 389 } 390 391 void 392 kmsan_init_arg(size_t n) 393 { 394 msan_td_t *mtd; 395 uint8_t *arg; 396 397 if (__predict_false(!kmsan_enabled)) 398 return; 399 if (__predict_false(curthread == NULL)) 400 return; 401 mtd = curthread->td_kmsan; 402 arg = mtd->tls[mtd->ctx].param_shadow; 403 __builtin_memset(arg, 0, n); 404 } 405 406 void 407 kmsan_init_ret(size_t n) 408 { 409 msan_td_t *mtd; 410 uint8_t *arg; 411 412 if (__predict_false(!kmsan_enabled)) 413 return; 414 if (__predict_false(curthread == NULL)) 415 return; 416 mtd = curthread->td_kmsan; 417 arg = mtd->tls[mtd->ctx].retval_shadow; 418 __builtin_memset(arg, 0, n); 419 } 420 421 static void 422 kmsan_check_arg(size_t size, const char *hook) 423 { 424 msan_orig_t *orig; 425 msan_td_t *mtd; 426 uint8_t *arg; 427 size_t ctx, i; 428 429 if (__predict_false(!kmsan_enabled)) 430 return; 431 if (__predict_false(curthread == NULL)) 432 return; 433 mtd = curthread->td_kmsan; 434 ctx = mtd->ctx; 435 arg = mtd->tls[ctx].param_shadow; 436 437 for (i = 0; i < size; i++) { 438 if (__predict_true(arg[i] == 0)) 439 continue; 440 orig = &mtd->tls[ctx].param_origin[i / sizeof(msan_orig_t)]; 441 kmsan_report_hook((const char *)arg + i, orig, size, i, hook); 442 break; 443 } 444 } 445 446 void 447 kmsan_thread_alloc(struct thread *td) 448 { 449 msan_td_t *mtd; 450 451 if (!kmsan_enabled) 452 return; 453 454 mtd = td->td_kmsan; 455 if (mtd == NULL) { 456 /* We might be recycling a thread. */ 457 kmsan_init_arg(sizeof(size_t) + sizeof(struct malloc_type *) + 458 sizeof(int)); 459 mtd = malloc(sizeof(*mtd), M_KMSAN, M_WAITOK); 460 } 461 __builtin_memset(mtd, 0, sizeof(*mtd)); 462 mtd->ctx = 0; 463 464 if (td->td_kstack != 0) 465 kmsan_mark((void *)td->td_kstack, ptoa(td->td_kstack_pages), 466 KMSAN_STATE_UNINIT); 467 468 td->td_kmsan = mtd; 469 } 470 471 void 472 kmsan_thread_free(struct thread *td) 473 { 474 msan_td_t *mtd; 475 476 if (!kmsan_enabled) 477 return; 478 if (__predict_false(td == curthread)) 479 kmsan_panic("%s: freeing KMSAN TLS for curthread", __func__); 480 481 mtd = td->td_kmsan; 482 kmsan_init_arg(sizeof(void *) + sizeof(struct malloc_type *)); 483 free(mtd, M_KMSAN); 484 td->td_kmsan = NULL; 485 } 486 487 void kmsan_intr_enter(void); 488 void kmsan_intr_leave(void); 489 490 void 491 kmsan_intr_enter(void) 492 { 493 msan_td_t *mtd; 494 495 if (__predict_false(!kmsan_enabled)) 496 return; 497 498 mtd = curthread->td_kmsan; 499 mtd->ctx++; 500 if (__predict_false(mtd->ctx >= MSAN_NCONTEXT)) 501 kmsan_panic("%s: mtd->ctx = %zu", __func__, mtd->ctx); 502 } 503 504 void 505 kmsan_intr_leave(void) 506 { 507 msan_td_t *mtd; 508 509 if (__predict_false(!kmsan_enabled)) 510 return; 511 512 mtd = curthread->td_kmsan; 513 if (__predict_false(mtd->ctx == 0)) 514 kmsan_panic("%s: mtd->ctx = %zu", __func__, mtd->ctx); 515 mtd->ctx--; 516 } 517 518 /* -------------------------------------------------------------------------- */ 519 520 void 521 kmsan_shadow_map(vm_offset_t addr, size_t size) 522 { 523 size_t npages, i; 524 vm_offset_t va; 525 526 MPASS(addr % PAGE_SIZE == 0); 527 MPASS(size % PAGE_SIZE == 0); 528 529 if (!kmsan_enabled) 530 return; 531 532 npages = atop(size); 533 534 va = kmsan_md_addr_to_shad(addr); 535 for (i = 0; i < npages; i++) { 536 pmap_san_enter(va + ptoa(i)); 537 } 538 539 va = kmsan_md_addr_to_orig(addr); 540 for (i = 0; i < npages; i++) { 541 pmap_san_enter(va + ptoa(i)); 542 } 543 } 544 545 void 546 kmsan_orig(const void *addr, size_t size, int type, uintptr_t pc) 547 { 548 msan_orig_t orig; 549 550 orig = kmsan_md_orig_encode(type, pc); 551 kmsan_origin_fill(addr, orig, size); 552 } 553 554 void 555 kmsan_mark(const void *addr, size_t size, uint8_t c) 556 { 557 kmsan_shadow_fill((uintptr_t)addr, c, size); 558 } 559 560 void 561 kmsan_mark_bio(const struct bio *bp, uint8_t c) 562 { 563 kmsan_mark(bp->bio_data, bp->bio_length, c); 564 } 565 566 void 567 kmsan_mark_mbuf(const struct mbuf *m, uint8_t c) 568 { 569 do { 570 if ((m->m_flags & M_EXTPG) == 0) 571 kmsan_mark(m->m_data, m->m_len, c); 572 m = m->m_next; 573 } while (m != NULL); 574 } 575 576 void 577 kmsan_check(const void *p, size_t sz, const char *descr) 578 { 579 kmsan_shadow_check((uintptr_t)p, sz, descr); 580 } 581 582 void 583 kmsan_check_bio(const struct bio *bp, const char *descr) 584 { 585 kmsan_shadow_check((uintptr_t)bp->bio_data, bp->bio_length, descr); 586 } 587 588 void 589 kmsan_check_mbuf(const struct mbuf *m, const char *descr) 590 { 591 do { 592 kmsan_shadow_check((uintptr_t)mtod(m, void *), m->m_len, descr); 593 } while ((m = m->m_next) != NULL); 594 } 595 596 void 597 kmsan_check_uio(const struct uio *uio, const char *descr) 598 { 599 for (int i = 0; i < uio->uio_iovcnt; i++) { 600 kmsan_check(uio->uio_iov[i].iov_base, uio->uio_iov[i].iov_len, 601 descr); 602 } 603 } 604 605 void 606 kmsan_init(void) 607 { 608 int disabled; 609 610 disabled = 0; 611 TUNABLE_INT_FETCH("debug.kmsan.disabled", &disabled); 612 if (disabled) 613 return; 614 615 /* Initialize the TLS for curthread. */ 616 msan_thread0.ctx = 0; 617 thread0.td_kmsan = &msan_thread0; 618 619 /* Now officially enabled. */ 620 kmsan_disabled = false; 621 } 622 623 /* -------------------------------------------------------------------------- */ 624 625 msan_meta_t __msan_metadata_ptr_for_load_n(void *, size_t); 626 msan_meta_t __msan_metadata_ptr_for_store_n(void *, size_t); 627 628 msan_meta_t 629 __msan_metadata_ptr_for_load_n(void *addr, size_t size) 630 { 631 return (kmsan_meta_get(addr, size, false)); 632 } 633 634 msan_meta_t 635 __msan_metadata_ptr_for_store_n(void *addr, size_t size) 636 { 637 return (kmsan_meta_get(addr, size, true)); 638 } 639 640 #define MSAN_META_FUNC(size) \ 641 msan_meta_t __msan_metadata_ptr_for_load_##size(void *); \ 642 msan_meta_t __msan_metadata_ptr_for_load_##size(void *addr) \ 643 { \ 644 return (kmsan_meta_get(addr, size, false)); \ 645 } \ 646 msan_meta_t __msan_metadata_ptr_for_store_##size(void *); \ 647 msan_meta_t __msan_metadata_ptr_for_store_##size(void *addr) \ 648 { \ 649 return (kmsan_meta_get(addr, size, true)); \ 650 } 651 652 MSAN_META_FUNC(1) 653 MSAN_META_FUNC(2) 654 MSAN_META_FUNC(4) 655 MSAN_META_FUNC(8) 656 657 void __msan_instrument_asm_store(const void *, size_t); 658 msan_orig_t __msan_chain_origin(msan_orig_t); 659 void __msan_poison(const void *, size_t); 660 void __msan_unpoison(const void *, size_t); 661 void __msan_poison_alloca(const void *, uint64_t, const char *); 662 void __msan_unpoison_alloca(const void *, uint64_t); 663 void __msan_warning(msan_orig_t); 664 msan_tls_t *__msan_get_context_state(void); 665 666 void 667 __msan_instrument_asm_store(const void *addr, size_t size) 668 { 669 kmsan_shadow_fill((uintptr_t)addr, KMSAN_STATE_INITED, size); 670 } 671 672 msan_orig_t 673 __msan_chain_origin(msan_orig_t origin) 674 { 675 return (origin); 676 } 677 678 void 679 __msan_poison(const void *addr, size_t size) 680 { 681 kmsan_shadow_fill((uintptr_t)addr, KMSAN_STATE_UNINIT, size); 682 } 683 684 void 685 __msan_unpoison(const void *addr, size_t size) 686 { 687 kmsan_shadow_fill((uintptr_t)addr, KMSAN_STATE_INITED, size); 688 } 689 690 void 691 __msan_poison_alloca(const void *addr, uint64_t size, const char *descr) 692 { 693 msan_orig_t orig; 694 695 orig = kmsan_md_orig_encode(KMSAN_TYPE_STACK, (uintptr_t)descr); 696 kmsan_origin_fill(addr, orig, size); 697 kmsan_shadow_fill((uintptr_t)addr, KMSAN_STATE_UNINIT, size); 698 } 699 700 void 701 __msan_unpoison_alloca(const void *addr, uint64_t size) 702 { 703 kmsan_shadow_fill((uintptr_t)addr, KMSAN_STATE_INITED, size); 704 } 705 706 void 707 __msan_warning(msan_orig_t origin) 708 { 709 if (__predict_false(!kmsan_enabled)) 710 return; 711 kmsan_report_inline(origin, KMSAN_RET_ADDR); 712 } 713 714 msan_tls_t * 715 __msan_get_context_state(void) 716 { 717 msan_td_t *mtd; 718 719 /* 720 * When APs are started, they execute some C code before curthread is 721 * set. We have to handle that here. 722 */ 723 if (__predict_false(!kmsan_enabled || curthread == NULL)) 724 return (&dummy_tls); 725 mtd = curthread->td_kmsan; 726 return (&mtd->tls[mtd->ctx]); 727 } 728 729 /* -------------------------------------------------------------------------- */ 730 731 /* 732 * Function hooks. Mostly ASM functions which need KMSAN wrappers to handle 733 * initialized areas properly. 734 */ 735 736 void * 737 kmsan_memcpy(void *dst, const void *src, size_t len) 738 { 739 /* No kmsan_check_arg, because inlined. */ 740 kmsan_init_ret(sizeof(void *)); 741 if (__predict_true(len != 0)) { 742 kmsan_meta_copy(dst, src, len); 743 } 744 return (__builtin_memcpy(dst, src, len)); 745 } 746 747 int 748 kmsan_memcmp(const void *b1, const void *b2, size_t len) 749 { 750 const uint8_t *_b1 = b1, *_b2 = b2; 751 size_t i; 752 753 kmsan_check_arg(sizeof(b1) + sizeof(b2) + sizeof(len), 754 "memcmp():args"); 755 kmsan_init_ret(sizeof(int)); 756 757 for (i = 0; i < len; i++) { 758 if (*_b1 != *_b2) { 759 kmsan_shadow_check((uintptr_t)b1, i + 1, 760 "memcmp():arg1"); 761 kmsan_shadow_check((uintptr_t)b2, i + 1, 762 "memcmp():arg2"); 763 return (*_b1 - *_b2); 764 } 765 _b1++, _b2++; 766 } 767 768 return (0); 769 } 770 771 void * 772 kmsan_memset(void *dst, int c, size_t len) 773 { 774 /* No kmsan_check_arg, because inlined. */ 775 kmsan_shadow_fill((uintptr_t)dst, KMSAN_STATE_INITED, len); 776 kmsan_init_ret(sizeof(void *)); 777 return (__builtin_memset(dst, c, len)); 778 } 779 780 void * 781 kmsan_memmove(void *dst, const void *src, size_t len) 782 { 783 /* No kmsan_check_arg, because inlined. */ 784 if (__predict_true(len != 0)) { 785 kmsan_meta_copy(dst, src, len); 786 } 787 kmsan_init_ret(sizeof(void *)); 788 return (__builtin_memmove(dst, src, len)); 789 } 790 791 __strong_reference(kmsan_memcpy, __msan_memcpy); 792 __strong_reference(kmsan_memset, __msan_memset); 793 __strong_reference(kmsan_memmove, __msan_memmove); 794 795 char * 796 kmsan_strcpy(char *dst, const char *src) 797 { 798 const char *_src = src; 799 char *_dst = dst; 800 size_t len = 0; 801 802 kmsan_check_arg(sizeof(dst) + sizeof(src), "strcpy():args"); 803 804 while (1) { 805 len++; 806 *dst = *src; 807 if (*src == '\0') 808 break; 809 src++, dst++; 810 } 811 812 kmsan_shadow_check((uintptr_t)_src, len, "strcpy():arg2"); 813 kmsan_shadow_fill((uintptr_t)_dst, KMSAN_STATE_INITED, len); 814 kmsan_init_ret(sizeof(char *)); 815 return (_dst); 816 } 817 818 int 819 kmsan_strcmp(const char *s1, const char *s2) 820 { 821 const char *_s1 = s1, *_s2 = s2; 822 size_t len = 0; 823 824 kmsan_check_arg(sizeof(s1) + sizeof(s2), "strcmp():args"); 825 kmsan_init_ret(sizeof(int)); 826 827 while (1) { 828 len++; 829 if (*s1 != *s2) 830 break; 831 if (*s1 == '\0') { 832 kmsan_shadow_check((uintptr_t)_s1, len, "strcmp():arg1"); 833 kmsan_shadow_check((uintptr_t)_s2, len, "strcmp():arg2"); 834 return (0); 835 } 836 s1++, s2++; 837 } 838 839 kmsan_shadow_check((uintptr_t)_s1, len, "strcmp():arg1"); 840 kmsan_shadow_check((uintptr_t)_s2, len, "strcmp():arg2"); 841 842 return (*(const unsigned char *)s1 - *(const unsigned char *)s2); 843 } 844 845 size_t 846 kmsan_strlen(const char *str) 847 { 848 const char *s; 849 850 kmsan_check_arg(sizeof(str), "strlen():args"); 851 852 s = str; 853 while (1) { 854 if (*s == '\0') 855 break; 856 s++; 857 } 858 859 kmsan_shadow_check((uintptr_t)str, (size_t)(s - str) + 1, "strlen():arg1"); 860 kmsan_init_ret(sizeof(size_t)); 861 return (s - str); 862 } 863 864 int kmsan_copyin(const void *, void *, size_t); 865 int kmsan_copyout(const void *, void *, size_t); 866 int kmsan_copyinstr(const void *, void *, size_t, size_t *); 867 868 int 869 kmsan_copyin(const void *uaddr, void *kaddr, size_t len) 870 { 871 int ret; 872 873 kmsan_check_arg(sizeof(uaddr) + sizeof(kaddr) + sizeof(len), 874 "copyin():args"); 875 ret = copyin(uaddr, kaddr, len); 876 if (ret == 0) 877 kmsan_shadow_fill((uintptr_t)kaddr, KMSAN_STATE_INITED, len); 878 kmsan_init_ret(sizeof(int)); 879 return (ret); 880 } 881 882 int 883 kmsan_copyout(const void *kaddr, void *uaddr, size_t len) 884 { 885 kmsan_check_arg(sizeof(kaddr) + sizeof(uaddr) + sizeof(len), 886 "copyout():args"); 887 kmsan_shadow_check((uintptr_t)kaddr, len, "copyout():arg1"); 888 kmsan_init_ret(sizeof(int)); 889 return (copyout(kaddr, uaddr, len)); 890 } 891 892 int 893 kmsan_copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done) 894 { 895 size_t _done; 896 int ret; 897 898 kmsan_check_arg(sizeof(uaddr) + sizeof(kaddr) + 899 sizeof(len) + sizeof(done), "copyinstr():args"); 900 ret = copyinstr(uaddr, kaddr, len, &_done); 901 if (ret == 0) 902 kmsan_shadow_fill((uintptr_t)kaddr, KMSAN_STATE_INITED, _done); 903 if (done != NULL) { 904 *done = _done; 905 kmsan_shadow_fill((uintptr_t)done, KMSAN_STATE_INITED, sizeof(size_t)); 906 } 907 kmsan_init_ret(sizeof(int)); 908 return (ret); 909 } 910 911 /* -------------------------------------------------------------------------- */ 912 913 int 914 kmsan_fubyte(volatile const void *base) 915 { 916 int ret; 917 918 kmsan_check_arg(sizeof(base), "fubyte(): args"); 919 ret = fubyte(base); 920 kmsan_init_ret(sizeof(int)); 921 return (ret); 922 } 923 924 int 925 kmsan_fuword16(volatile const void *base) 926 { 927 int ret; 928 929 kmsan_check_arg(sizeof(base), "fuword16(): args"); 930 ret = fuword16(base); 931 kmsan_init_ret(sizeof(int)); 932 return (ret); 933 } 934 935 int 936 kmsan_fueword(volatile const void *base, long *val) 937 { 938 int ret; 939 940 kmsan_check_arg(sizeof(base) + sizeof(val), "fueword(): args"); 941 ret = fueword(base, val); 942 if (ret == 0) 943 kmsan_shadow_fill((uintptr_t)val, KMSAN_STATE_INITED, 944 sizeof(*val)); 945 kmsan_init_ret(sizeof(int)); 946 return (ret); 947 } 948 949 int 950 kmsan_fueword32(volatile const void *base, int32_t *val) 951 { 952 int ret; 953 954 kmsan_check_arg(sizeof(base) + sizeof(val), "fueword32(): args"); 955 ret = fueword32(base, val); 956 if (ret == 0) 957 kmsan_shadow_fill((uintptr_t)val, KMSAN_STATE_INITED, 958 sizeof(*val)); 959 kmsan_init_ret(sizeof(int)); 960 return (ret); 961 } 962 963 int 964 kmsan_fueword64(volatile const void *base, int64_t *val) 965 { 966 int ret; 967 968 kmsan_check_arg(sizeof(base) + sizeof(val), "fueword64(): args"); 969 ret = fueword64(base, val); 970 if (ret == 0) 971 kmsan_shadow_fill((uintptr_t)val, KMSAN_STATE_INITED, 972 sizeof(*val)); 973 kmsan_init_ret(sizeof(int)); 974 return (ret); 975 } 976 977 int 978 kmsan_subyte(volatile void *base, int byte) 979 { 980 int ret; 981 982 kmsan_check_arg(sizeof(base) + sizeof(byte), "subyte():args"); 983 ret = subyte(base, byte); 984 kmsan_init_ret(sizeof(int)); 985 return (ret); 986 } 987 988 int 989 kmsan_suword(volatile void *base, long word) 990 { 991 int ret; 992 993 kmsan_check_arg(sizeof(base) + sizeof(word), "suword():args"); 994 ret = suword(base, word); 995 kmsan_init_ret(sizeof(int)); 996 return (ret); 997 } 998 999 int 1000 kmsan_suword16(volatile void *base, int word) 1001 { 1002 int ret; 1003 1004 kmsan_check_arg(sizeof(base) + sizeof(word), "suword16():args"); 1005 ret = suword16(base, word); 1006 kmsan_init_ret(sizeof(int)); 1007 return (ret); 1008 } 1009 1010 int 1011 kmsan_suword32(volatile void *base, int32_t word) 1012 { 1013 int ret; 1014 1015 kmsan_check_arg(sizeof(base) + sizeof(word), "suword32():args"); 1016 ret = suword32(base, word); 1017 kmsan_init_ret(sizeof(int)); 1018 return (ret); 1019 } 1020 1021 int 1022 kmsan_suword64(volatile void *base, int64_t word) 1023 { 1024 int ret; 1025 1026 kmsan_check_arg(sizeof(base) + sizeof(word), "suword64():args"); 1027 ret = suword64(base, word); 1028 kmsan_init_ret(sizeof(int)); 1029 return (ret); 1030 } 1031 1032 int 1033 kmsan_casueword32(volatile uint32_t *base, uint32_t oldval, uint32_t *oldvalp, 1034 uint32_t newval) 1035 { 1036 int ret; 1037 1038 kmsan_check_arg(sizeof(base) + sizeof(oldval) + sizeof(oldvalp) + 1039 sizeof(newval), "casueword32(): args"); 1040 ret = casueword32(base, oldval, oldvalp, newval); 1041 kmsan_shadow_fill((uintptr_t)oldvalp, KMSAN_STATE_INITED, 1042 sizeof(*oldvalp)); 1043 kmsan_init_ret(sizeof(int)); 1044 return (ret); 1045 } 1046 1047 int 1048 kmsan_casueword(volatile u_long *base, u_long oldval, u_long *oldvalp, 1049 u_long newval) 1050 { 1051 int ret; 1052 1053 kmsan_check_arg(sizeof(base) + sizeof(oldval) + sizeof(oldvalp) + 1054 sizeof(newval), "casueword32(): args"); 1055 ret = casueword(base, oldval, oldvalp, newval); 1056 kmsan_shadow_fill((uintptr_t)oldvalp, KMSAN_STATE_INITED, 1057 sizeof(*oldvalp)); 1058 kmsan_init_ret(sizeof(int)); 1059 return (ret); 1060 } 1061 1062 /* -------------------------------------------------------------------------- */ 1063 1064 #include <machine/atomic.h> 1065 #include <sys/atomic_san.h> 1066 1067 #define _MSAN_ATOMIC_FUNC_ADD(name, type) \ 1068 void kmsan_atomic_add_##name(volatile type *ptr, type val) \ 1069 { \ 1070 kmsan_check_arg(sizeof(ptr) + sizeof(val), \ 1071 "atomic_add_" #name "():args"); \ 1072 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1073 "atomic_add_" #name "():ptr"); \ 1074 atomic_add_##name(ptr, val); \ 1075 } 1076 1077 #define MSAN_ATOMIC_FUNC_ADD(name, type) \ 1078 _MSAN_ATOMIC_FUNC_ADD(name, type) \ 1079 _MSAN_ATOMIC_FUNC_ADD(acq_##name, type) \ 1080 _MSAN_ATOMIC_FUNC_ADD(rel_##name, type) 1081 1082 #define _MSAN_ATOMIC_FUNC_SUBTRACT(name, type) \ 1083 void kmsan_atomic_subtract_##name(volatile type *ptr, type val) \ 1084 { \ 1085 kmsan_check_arg(sizeof(ptr) + sizeof(val), \ 1086 "atomic_subtract_" #name "():args"); \ 1087 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1088 "atomic_subtract_" #name "():ptr"); \ 1089 atomic_subtract_##name(ptr, val); \ 1090 } 1091 1092 #define MSAN_ATOMIC_FUNC_SUBTRACT(name, type) \ 1093 _MSAN_ATOMIC_FUNC_SUBTRACT(name, type) \ 1094 _MSAN_ATOMIC_FUNC_SUBTRACT(acq_##name, type) \ 1095 _MSAN_ATOMIC_FUNC_SUBTRACT(rel_##name, type) 1096 1097 #define _MSAN_ATOMIC_FUNC_SET(name, type) \ 1098 void kmsan_atomic_set_##name(volatile type *ptr, type val) \ 1099 { \ 1100 kmsan_check_arg(sizeof(ptr) + sizeof(val), \ 1101 "atomic_set_" #name "():args"); \ 1102 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1103 "atomic_set_" #name "():ptr"); \ 1104 atomic_set_##name(ptr, val); \ 1105 } 1106 1107 #define MSAN_ATOMIC_FUNC_SET(name, type) \ 1108 _MSAN_ATOMIC_FUNC_SET(name, type) \ 1109 _MSAN_ATOMIC_FUNC_SET(acq_##name, type) \ 1110 _MSAN_ATOMIC_FUNC_SET(rel_##name, type) 1111 1112 #define _MSAN_ATOMIC_FUNC_CLEAR(name, type) \ 1113 void kmsan_atomic_clear_##name(volatile type *ptr, type val) \ 1114 { \ 1115 kmsan_check_arg(sizeof(ptr) + sizeof(val), \ 1116 "atomic_clear_" #name "():args"); \ 1117 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1118 "atomic_clear_" #name "():ptr"); \ 1119 atomic_clear_##name(ptr, val); \ 1120 } 1121 1122 #define MSAN_ATOMIC_FUNC_CLEAR(name, type) \ 1123 _MSAN_ATOMIC_FUNC_CLEAR(name, type) \ 1124 _MSAN_ATOMIC_FUNC_CLEAR(acq_##name, type) \ 1125 _MSAN_ATOMIC_FUNC_CLEAR(rel_##name, type) 1126 1127 #define MSAN_ATOMIC_FUNC_FETCHADD(name, type) \ 1128 type kmsan_atomic_fetchadd_##name(volatile type *ptr, type val) \ 1129 { \ 1130 kmsan_check_arg(sizeof(ptr) + sizeof(val), \ 1131 "atomic_fetchadd_" #name "():args"); \ 1132 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1133 "atomic_fetchadd_" #name "():ptr"); \ 1134 kmsan_init_ret(sizeof(type)); \ 1135 return (atomic_fetchadd_##name(ptr, val)); \ 1136 } 1137 1138 #define MSAN_ATOMIC_FUNC_READANDCLEAR(name, type) \ 1139 type kmsan_atomic_readandclear_##name(volatile type *ptr) \ 1140 { \ 1141 kmsan_check_arg(sizeof(ptr), \ 1142 "atomic_readandclear_" #name "():args"); \ 1143 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1144 "atomic_readandclear_" #name "():ptr"); \ 1145 kmsan_init_ret(sizeof(type)); \ 1146 return (atomic_readandclear_##name(ptr)); \ 1147 } 1148 1149 #define MSAN_ATOMIC_FUNC_TESTANDCLEAR(name, type) \ 1150 int kmsan_atomic_testandclear_##name(volatile type *ptr, u_int v) \ 1151 { \ 1152 kmsan_check_arg(sizeof(ptr) + sizeof(v), \ 1153 "atomic_testandclear_" #name "():args"); \ 1154 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1155 "atomic_testandclear_" #name "():ptr"); \ 1156 kmsan_init_ret(sizeof(int)); \ 1157 return (atomic_testandclear_##name(ptr, v)); \ 1158 } 1159 1160 #define MSAN_ATOMIC_FUNC_TESTANDSET(name, type) \ 1161 int kmsan_atomic_testandset_##name(volatile type *ptr, u_int v) \ 1162 { \ 1163 kmsan_check_arg(sizeof(ptr) + sizeof(v), \ 1164 "atomic_testandset_" #name "():args"); \ 1165 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1166 "atomic_testandset_" #name "():ptr"); \ 1167 kmsan_init_ret(sizeof(int)); \ 1168 return (atomic_testandset_##name(ptr, v)); \ 1169 } 1170 1171 #define MSAN_ATOMIC_FUNC_SWAP(name, type) \ 1172 type kmsan_atomic_swap_##name(volatile type *ptr, type val) \ 1173 { \ 1174 kmsan_check_arg(sizeof(ptr) + sizeof(val), \ 1175 "atomic_swap_" #name "():args"); \ 1176 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1177 "atomic_swap_" #name "():ptr"); \ 1178 kmsan_init_ret(sizeof(type)); \ 1179 return (atomic_swap_##name(ptr, val)); \ 1180 } 1181 1182 #define _MSAN_ATOMIC_FUNC_CMPSET(name, type) \ 1183 int kmsan_atomic_cmpset_##name(volatile type *ptr, type oval, \ 1184 type nval) \ 1185 { \ 1186 kmsan_check_arg(sizeof(ptr) + sizeof(oval) + \ 1187 sizeof(nval), "atomic_cmpset_" #name "():args"); \ 1188 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1189 "atomic_cmpset_" #name "():ptr"); \ 1190 kmsan_init_ret(sizeof(int)); \ 1191 return (atomic_cmpset_##name(ptr, oval, nval)); \ 1192 } 1193 1194 #define MSAN_ATOMIC_FUNC_CMPSET(name, type) \ 1195 _MSAN_ATOMIC_FUNC_CMPSET(name, type) \ 1196 _MSAN_ATOMIC_FUNC_CMPSET(acq_##name, type) \ 1197 _MSAN_ATOMIC_FUNC_CMPSET(rel_##name, type) 1198 1199 #define _MSAN_ATOMIC_FUNC_FCMPSET(name, type) \ 1200 int kmsan_atomic_fcmpset_##name(volatile type *ptr, type *oval, \ 1201 type nval) \ 1202 { \ 1203 kmsan_check_arg(sizeof(ptr) + sizeof(oval) + \ 1204 sizeof(nval), "atomic_fcmpset_" #name "():args"); \ 1205 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1206 "atomic_fcmpset_" #name "():ptr"); \ 1207 kmsan_init_ret(sizeof(int)); \ 1208 return (atomic_fcmpset_##name(ptr, oval, nval)); \ 1209 } 1210 1211 #define MSAN_ATOMIC_FUNC_FCMPSET(name, type) \ 1212 _MSAN_ATOMIC_FUNC_FCMPSET(name, type) \ 1213 _MSAN_ATOMIC_FUNC_FCMPSET(acq_##name, type) \ 1214 _MSAN_ATOMIC_FUNC_FCMPSET(rel_##name, type) 1215 1216 #define MSAN_ATOMIC_FUNC_THREAD_FENCE(name) \ 1217 void kmsan_atomic_thread_fence_##name(void) \ 1218 { \ 1219 atomic_thread_fence_##name(); \ 1220 } 1221 1222 #define _MSAN_ATOMIC_FUNC_LOAD(name, type) \ 1223 type kmsan_atomic_load_##name(volatile type *ptr) \ 1224 { \ 1225 kmsan_check_arg(sizeof(ptr), \ 1226 "atomic_load_" #name "():args"); \ 1227 kmsan_shadow_check((uintptr_t)ptr, sizeof(type), \ 1228 "atomic_load_" #name "():ptr"); \ 1229 kmsan_init_ret(sizeof(type)); \ 1230 return (atomic_load_##name(ptr)); \ 1231 } 1232 1233 #define MSAN_ATOMIC_FUNC_LOAD(name, type) \ 1234 _MSAN_ATOMIC_FUNC_LOAD(name, type) \ 1235 _MSAN_ATOMIC_FUNC_LOAD(acq_##name, type) 1236 1237 #define _MSAN_ATOMIC_FUNC_STORE(name, type) \ 1238 void kmsan_atomic_store_##name(volatile type *ptr, type val) \ 1239 { \ 1240 kmsan_check_arg(sizeof(ptr) + sizeof(val), \ 1241 "atomic_store_" #name "():args"); \ 1242 kmsan_shadow_fill((uintptr_t)ptr, KMSAN_STATE_INITED, \ 1243 sizeof(type)); \ 1244 atomic_store_##name(ptr, val); \ 1245 } 1246 1247 #define MSAN_ATOMIC_FUNC_STORE(name, type) \ 1248 _MSAN_ATOMIC_FUNC_STORE(name, type) \ 1249 _MSAN_ATOMIC_FUNC_STORE(rel_##name, type) 1250 1251 MSAN_ATOMIC_FUNC_ADD(8, uint8_t); 1252 MSAN_ATOMIC_FUNC_ADD(16, uint16_t); 1253 MSAN_ATOMIC_FUNC_ADD(32, uint32_t); 1254 MSAN_ATOMIC_FUNC_ADD(64, uint64_t); 1255 MSAN_ATOMIC_FUNC_ADD(int, u_int); 1256 MSAN_ATOMIC_FUNC_ADD(long, u_long); 1257 MSAN_ATOMIC_FUNC_ADD(ptr, uintptr_t); 1258 1259 MSAN_ATOMIC_FUNC_SUBTRACT(8, uint8_t); 1260 MSAN_ATOMIC_FUNC_SUBTRACT(16, uint16_t); 1261 MSAN_ATOMIC_FUNC_SUBTRACT(32, uint32_t); 1262 MSAN_ATOMIC_FUNC_SUBTRACT(64, uint64_t); 1263 MSAN_ATOMIC_FUNC_SUBTRACT(int, u_int); 1264 MSAN_ATOMIC_FUNC_SUBTRACT(long, u_long); 1265 MSAN_ATOMIC_FUNC_SUBTRACT(ptr, uintptr_t); 1266 1267 MSAN_ATOMIC_FUNC_SET(8, uint8_t); 1268 MSAN_ATOMIC_FUNC_SET(16, uint16_t); 1269 MSAN_ATOMIC_FUNC_SET(32, uint32_t); 1270 MSAN_ATOMIC_FUNC_SET(64, uint64_t); 1271 MSAN_ATOMIC_FUNC_SET(int, u_int); 1272 MSAN_ATOMIC_FUNC_SET(long, u_long); 1273 MSAN_ATOMIC_FUNC_SET(ptr, uintptr_t); 1274 1275 MSAN_ATOMIC_FUNC_CLEAR(8, uint8_t); 1276 MSAN_ATOMIC_FUNC_CLEAR(16, uint16_t); 1277 MSAN_ATOMIC_FUNC_CLEAR(32, uint32_t); 1278 MSAN_ATOMIC_FUNC_CLEAR(64, uint64_t); 1279 MSAN_ATOMIC_FUNC_CLEAR(int, u_int); 1280 MSAN_ATOMIC_FUNC_CLEAR(long, u_long); 1281 MSAN_ATOMIC_FUNC_CLEAR(ptr, uintptr_t); 1282 1283 MSAN_ATOMIC_FUNC_FETCHADD(32, uint32_t); 1284 MSAN_ATOMIC_FUNC_FETCHADD(64, uint64_t); 1285 MSAN_ATOMIC_FUNC_FETCHADD(int, u_int); 1286 MSAN_ATOMIC_FUNC_FETCHADD(long, u_long); 1287 1288 MSAN_ATOMIC_FUNC_READANDCLEAR(32, uint32_t); 1289 MSAN_ATOMIC_FUNC_READANDCLEAR(64, uint64_t); 1290 MSAN_ATOMIC_FUNC_READANDCLEAR(int, u_int); 1291 MSAN_ATOMIC_FUNC_READANDCLEAR(long, u_long); 1292 MSAN_ATOMIC_FUNC_READANDCLEAR(ptr, uintptr_t); 1293 1294 MSAN_ATOMIC_FUNC_TESTANDCLEAR(32, uint32_t); 1295 MSAN_ATOMIC_FUNC_TESTANDCLEAR(64, uint64_t); 1296 MSAN_ATOMIC_FUNC_TESTANDCLEAR(int, u_int); 1297 MSAN_ATOMIC_FUNC_TESTANDCLEAR(long, u_long); 1298 MSAN_ATOMIC_FUNC_TESTANDCLEAR(ptr, uintptr_t); 1299 1300 MSAN_ATOMIC_FUNC_TESTANDSET(32, uint32_t); 1301 MSAN_ATOMIC_FUNC_TESTANDSET(64, uint64_t); 1302 MSAN_ATOMIC_FUNC_TESTANDSET(int, u_int); 1303 MSAN_ATOMIC_FUNC_TESTANDSET(long, u_long); 1304 MSAN_ATOMIC_FUNC_TESTANDSET(ptr, uintptr_t); 1305 1306 MSAN_ATOMIC_FUNC_SWAP(32, uint32_t); 1307 MSAN_ATOMIC_FUNC_SWAP(64, uint64_t); 1308 MSAN_ATOMIC_FUNC_SWAP(int, u_int); 1309 MSAN_ATOMIC_FUNC_SWAP(long, u_long); 1310 MSAN_ATOMIC_FUNC_SWAP(ptr, uintptr_t); 1311 1312 MSAN_ATOMIC_FUNC_CMPSET(8, uint8_t); 1313 MSAN_ATOMIC_FUNC_CMPSET(16, uint16_t); 1314 MSAN_ATOMIC_FUNC_CMPSET(32, uint32_t); 1315 MSAN_ATOMIC_FUNC_CMPSET(64, uint64_t); 1316 MSAN_ATOMIC_FUNC_CMPSET(int, u_int); 1317 MSAN_ATOMIC_FUNC_CMPSET(long, u_long); 1318 MSAN_ATOMIC_FUNC_CMPSET(ptr, uintptr_t); 1319 1320 MSAN_ATOMIC_FUNC_FCMPSET(8, uint8_t); 1321 MSAN_ATOMIC_FUNC_FCMPSET(16, uint16_t); 1322 MSAN_ATOMIC_FUNC_FCMPSET(32, uint32_t); 1323 MSAN_ATOMIC_FUNC_FCMPSET(64, uint64_t); 1324 MSAN_ATOMIC_FUNC_FCMPSET(int, u_int); 1325 MSAN_ATOMIC_FUNC_FCMPSET(long, u_long); 1326 MSAN_ATOMIC_FUNC_FCMPSET(ptr, uintptr_t); 1327 1328 _MSAN_ATOMIC_FUNC_LOAD(bool, bool); 1329 MSAN_ATOMIC_FUNC_LOAD(8, uint8_t); 1330 MSAN_ATOMIC_FUNC_LOAD(16, uint16_t); 1331 MSAN_ATOMIC_FUNC_LOAD(32, uint32_t); 1332 MSAN_ATOMIC_FUNC_LOAD(64, uint64_t); 1333 MSAN_ATOMIC_FUNC_LOAD(char, u_char); 1334 MSAN_ATOMIC_FUNC_LOAD(short, u_short); 1335 MSAN_ATOMIC_FUNC_LOAD(int, u_int); 1336 MSAN_ATOMIC_FUNC_LOAD(long, u_long); 1337 MSAN_ATOMIC_FUNC_LOAD(ptr, uintptr_t); 1338 1339 _MSAN_ATOMIC_FUNC_STORE(bool, bool); 1340 MSAN_ATOMIC_FUNC_STORE(8, uint8_t); 1341 MSAN_ATOMIC_FUNC_STORE(16, uint16_t); 1342 MSAN_ATOMIC_FUNC_STORE(32, uint32_t); 1343 MSAN_ATOMIC_FUNC_STORE(64, uint64_t); 1344 MSAN_ATOMIC_FUNC_STORE(char, u_char); 1345 MSAN_ATOMIC_FUNC_STORE(short, u_short); 1346 MSAN_ATOMIC_FUNC_STORE(int, u_int); 1347 MSAN_ATOMIC_FUNC_STORE(long, u_long); 1348 MSAN_ATOMIC_FUNC_STORE(ptr, uintptr_t); 1349 1350 MSAN_ATOMIC_FUNC_THREAD_FENCE(acq); 1351 MSAN_ATOMIC_FUNC_THREAD_FENCE(rel); 1352 MSAN_ATOMIC_FUNC_THREAD_FENCE(acq_rel); 1353 MSAN_ATOMIC_FUNC_THREAD_FENCE(seq_cst); 1354 1355 void 1356 kmsan_atomic_interrupt_fence(void) 1357 { 1358 atomic_interrupt_fence(); 1359 } 1360 1361 /* -------------------------------------------------------------------------- */ 1362 1363 #include <sys/bus.h> 1364 #include <machine/bus.h> 1365 #include <sys/bus_san.h> 1366 1367 int 1368 kmsan_bus_space_map(bus_space_tag_t tag, bus_addr_t hnd, bus_size_t size, 1369 int flags, bus_space_handle_t *handlep) 1370 { 1371 return (bus_space_map(tag, hnd, size, flags, handlep)); 1372 } 1373 1374 void 1375 kmsan_bus_space_unmap(bus_space_tag_t tag, bus_space_handle_t hnd, 1376 bus_size_t size) 1377 { 1378 bus_space_unmap(tag, hnd, size); 1379 } 1380 1381 int 1382 kmsan_bus_space_subregion(bus_space_tag_t tag, bus_space_handle_t hnd, 1383 bus_size_t offset, bus_size_t size, bus_space_handle_t *handlep) 1384 { 1385 return (bus_space_subregion(tag, hnd, offset, size, handlep)); 1386 } 1387 1388 void 1389 kmsan_bus_space_free(bus_space_tag_t tag, bus_space_handle_t hnd, 1390 bus_size_t size) 1391 { 1392 bus_space_free(tag, hnd, size); 1393 } 1394 1395 void 1396 kmsan_bus_space_barrier(bus_space_tag_t tag, bus_space_handle_t hnd, 1397 bus_size_t offset, bus_size_t size, int flags) 1398 { 1399 bus_space_barrier(tag, hnd, offset, size, flags); 1400 } 1401 1402 #if defined(__amd64__) 1403 #define BUS_SPACE_IO(tag) ((tag) == X86_BUS_SPACE_IO) 1404 #else 1405 #define BUS_SPACE_IO(tag) (false) 1406 #endif 1407 1408 #define MSAN_BUS_READ_FUNC(func, width, type) \ 1409 type kmsan_bus_space_read##func##_##width(bus_space_tag_t tag, \ 1410 bus_space_handle_t hnd, bus_size_t offset) \ 1411 { \ 1412 type ret; \ 1413 if (!BUS_SPACE_IO(tag)) \ 1414 kmsan_shadow_fill((uintptr_t)(hnd + offset), \ 1415 KMSAN_STATE_INITED, (width)); \ 1416 ret = bus_space_read##func##_##width(tag, hnd, offset); \ 1417 kmsan_init_ret(sizeof(type)); \ 1418 return (ret); \ 1419 } \ 1420 1421 #define MSAN_BUS_READ_PTR_FUNC(func, width, type) \ 1422 void kmsan_bus_space_read_##func##_##width(bus_space_tag_t tag, \ 1423 bus_space_handle_t hnd, bus_size_t size, type *buf, \ 1424 bus_size_t count) \ 1425 { \ 1426 kmsan_shadow_fill((uintptr_t)buf, KMSAN_STATE_INITED, \ 1427 (width) * count); \ 1428 bus_space_read_##func##_##width(tag, hnd, size, buf, \ 1429 count); \ 1430 } 1431 1432 MSAN_BUS_READ_FUNC(, 1, uint8_t) 1433 MSAN_BUS_READ_FUNC(_stream, 1, uint8_t) 1434 MSAN_BUS_READ_PTR_FUNC(multi, 1, uint8_t) 1435 MSAN_BUS_READ_PTR_FUNC(multi_stream, 1, uint8_t) 1436 MSAN_BUS_READ_PTR_FUNC(region, 1, uint8_t) 1437 MSAN_BUS_READ_PTR_FUNC(region_stream, 1, uint8_t) 1438 1439 MSAN_BUS_READ_FUNC(, 2, uint16_t) 1440 MSAN_BUS_READ_FUNC(_stream, 2, uint16_t) 1441 MSAN_BUS_READ_PTR_FUNC(multi, 2, uint16_t) 1442 MSAN_BUS_READ_PTR_FUNC(multi_stream, 2, uint16_t) 1443 MSAN_BUS_READ_PTR_FUNC(region, 2, uint16_t) 1444 MSAN_BUS_READ_PTR_FUNC(region_stream, 2, uint16_t) 1445 1446 MSAN_BUS_READ_FUNC(, 4, uint32_t) 1447 MSAN_BUS_READ_FUNC(_stream, 4, uint32_t) 1448 MSAN_BUS_READ_PTR_FUNC(multi, 4, uint32_t) 1449 MSAN_BUS_READ_PTR_FUNC(multi_stream, 4, uint32_t) 1450 MSAN_BUS_READ_PTR_FUNC(region, 4, uint32_t) 1451 MSAN_BUS_READ_PTR_FUNC(region_stream, 4, uint32_t) 1452 1453 MSAN_BUS_READ_FUNC(, 8, uint64_t) 1454 #ifndef __amd64__ 1455 MSAN_BUS_READ_FUNC(_stream, 8, uint64_t) 1456 MSAN_BUS_READ_PTR_FUNC(multi, 8, uint64_t) 1457 MSAN_BUS_READ_PTR_FUNC(multi_stream, 8, uint64_t) 1458 MSAN_BUS_READ_PTR_FUNC(region, 8, uint64_t) 1459 MSAN_BUS_READ_PTR_FUNC(region_stream, 8, uint64_t) 1460 #endif 1461 1462 #define MSAN_BUS_WRITE_FUNC(func, width, type) \ 1463 void kmsan_bus_space_write##func##_##width(bus_space_tag_t tag, \ 1464 bus_space_handle_t hnd, bus_size_t offset, type value) \ 1465 { \ 1466 bus_space_write##func##_##width(tag, hnd, offset, value);\ 1467 } \ 1468 1469 #define MSAN_BUS_WRITE_PTR_FUNC(func, width, type) \ 1470 void kmsan_bus_space_write_##func##_##width(bus_space_tag_t tag,\ 1471 bus_space_handle_t hnd, bus_size_t size, const type *buf, \ 1472 bus_size_t count) \ 1473 { \ 1474 kmsan_shadow_check((uintptr_t)buf, sizeof(type) * count,\ 1475 "bus_space_write()"); \ 1476 bus_space_write_##func##_##width(tag, hnd, size, buf, \ 1477 count); \ 1478 } 1479 1480 MSAN_BUS_WRITE_FUNC(, 1, uint8_t) 1481 MSAN_BUS_WRITE_FUNC(_stream, 1, uint8_t) 1482 MSAN_BUS_WRITE_PTR_FUNC(multi, 1, uint8_t) 1483 MSAN_BUS_WRITE_PTR_FUNC(multi_stream, 1, uint8_t) 1484 MSAN_BUS_WRITE_PTR_FUNC(region, 1, uint8_t) 1485 MSAN_BUS_WRITE_PTR_FUNC(region_stream, 1, uint8_t) 1486 1487 MSAN_BUS_WRITE_FUNC(, 2, uint16_t) 1488 MSAN_BUS_WRITE_FUNC(_stream, 2, uint16_t) 1489 MSAN_BUS_WRITE_PTR_FUNC(multi, 2, uint16_t) 1490 MSAN_BUS_WRITE_PTR_FUNC(multi_stream, 2, uint16_t) 1491 MSAN_BUS_WRITE_PTR_FUNC(region, 2, uint16_t) 1492 MSAN_BUS_WRITE_PTR_FUNC(region_stream, 2, uint16_t) 1493 1494 MSAN_BUS_WRITE_FUNC(, 4, uint32_t) 1495 MSAN_BUS_WRITE_FUNC(_stream, 4, uint32_t) 1496 MSAN_BUS_WRITE_PTR_FUNC(multi, 4, uint32_t) 1497 MSAN_BUS_WRITE_PTR_FUNC(multi_stream, 4, uint32_t) 1498 MSAN_BUS_WRITE_PTR_FUNC(region, 4, uint32_t) 1499 MSAN_BUS_WRITE_PTR_FUNC(region_stream, 4, uint32_t) 1500 1501 MSAN_BUS_WRITE_FUNC(, 8, uint64_t) 1502 1503 #define MSAN_BUS_SET_FUNC(func, width, type) \ 1504 void kmsan_bus_space_set_##func##_##width(bus_space_tag_t tag, \ 1505 bus_space_handle_t hnd, bus_size_t offset, type value, \ 1506 bus_size_t count) \ 1507 { \ 1508 bus_space_set_##func##_##width(tag, hnd, offset, value, \ 1509 count); \ 1510 } 1511 1512 MSAN_BUS_SET_FUNC(multi, 1, uint8_t) 1513 MSAN_BUS_SET_FUNC(region, 1, uint8_t) 1514 MSAN_BUS_SET_FUNC(multi_stream, 1, uint8_t) 1515 MSAN_BUS_SET_FUNC(region_stream, 1, uint8_t) 1516 1517 MSAN_BUS_SET_FUNC(multi, 2, uint16_t) 1518 MSAN_BUS_SET_FUNC(region, 2, uint16_t) 1519 MSAN_BUS_SET_FUNC(multi_stream, 2, uint16_t) 1520 MSAN_BUS_SET_FUNC(region_stream, 2, uint16_t) 1521 1522 MSAN_BUS_SET_FUNC(multi, 4, uint32_t) 1523 MSAN_BUS_SET_FUNC(region, 4, uint32_t) 1524 MSAN_BUS_SET_FUNC(multi_stream, 4, uint32_t) 1525 MSAN_BUS_SET_FUNC(region_stream, 4, uint32_t) 1526 1527 #define MSAN_BUS_PEEK_FUNC(width, type) \ 1528 int kmsan_bus_space_peek_##width(bus_space_tag_t tag, \ 1529 bus_space_handle_t hnd, bus_size_t offset, type *value) \ 1530 { \ 1531 return (bus_space_peek_##width(tag, hnd, offset, value)); \ 1532 } 1533 1534 MSAN_BUS_PEEK_FUNC(1, uint8_t) 1535 MSAN_BUS_PEEK_FUNC(2, uint16_t) 1536 MSAN_BUS_PEEK_FUNC(4, uint32_t) 1537 1538 #define MSAN_BUS_POKE_FUNC(width, type) \ 1539 int kmsan_bus_space_poke_##width(bus_space_tag_t tag, \ 1540 bus_space_handle_t hnd, bus_size_t offset, type value) \ 1541 { \ 1542 return (bus_space_poke_##width(tag, hnd, offset, value)); \ 1543 } 1544 1545 MSAN_BUS_POKE_FUNC(1, uint8_t) 1546 MSAN_BUS_POKE_FUNC(2, uint16_t) 1547 MSAN_BUS_POKE_FUNC(4, uint32_t) 1548 1549 /* -------------------------------------------------------------------------- */ 1550 1551 void 1552 kmsan_bus_dmamap_sync(struct memdesc *desc, bus_dmasync_op_t op) 1553 { 1554 /* 1555 * Some drivers, e.g., nvme, use the same code path for loading device 1556 * read and write requests, and will thus specify both flags. In this 1557 * case we should not do any checking since it will generally lead to 1558 * false positives. 1559 */ 1560 if ((op & (BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE)) == 1561 BUS_DMASYNC_PREWRITE) { 1562 switch (desc->md_type) { 1563 case MEMDESC_VADDR: 1564 kmsan_check(desc->u.md_vaddr, desc->md_len, 1565 "dmasync"); 1566 break; 1567 case MEMDESC_MBUF: 1568 kmsan_check_mbuf(desc->u.md_mbuf, "dmasync"); 1569 break; 1570 case 0: 1571 break; 1572 default: 1573 kmsan_panic("%s: unhandled memdesc type %d", __func__, 1574 desc->md_type); 1575 } 1576 } 1577 if ((op & BUS_DMASYNC_POSTREAD) != 0) { 1578 switch (desc->md_type) { 1579 case MEMDESC_VADDR: 1580 kmsan_mark(desc->u.md_vaddr, desc->md_len, 1581 KMSAN_STATE_INITED); 1582 break; 1583 case MEMDESC_MBUF: 1584 kmsan_mark_mbuf(desc->u.md_mbuf, KMSAN_STATE_INITED); 1585 break; 1586 case 0: 1587 break; 1588 default: 1589 kmsan_panic("%s: unhandled memdesc type %d", __func__, 1590 desc->md_type); 1591 } 1592 } 1593 } 1594