sys/kern/subr_asan.c

   1 /*      $NetBSD: subr_asan.c,v 1.26 2020/09/10 14:10:46 maxv Exp $      */
   2
   3 /*
   4  * Copyright (c) 2018-2020 Maxime Villard, m00nbsd.net
   5  * All rights reserved.
   6  *
   7  * This code is part of the KASAN subsystem of the NetBSD kernel.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  23  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  25  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #define SAN_RUNTIME
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35 #if 0
  36 __KERNEL_RCSID(0, "$NetBSD: subr_asan.c,v 1.26 2020/09/10 14:10:46 maxv Exp $");
  37 #endif
  38
  39 #include <sys/param.h>
  40 #include <sys/systm.h>
  41 #include <sys/asan.h>
  42 #include <sys/kernel.h>
  43 #include <sys/stack.h>
  44 #include <sys/sysctl.h>
  45
  46 #include <machine/asan.h>
  47
  48 /* ASAN constants. Part of the compiler ABI. */
  49 #define KASAN_SHADOW_MASK               (KASAN_SHADOW_SCALE - 1)
  50 #define KASAN_ALLOCA_SCALE_SIZE         32
  51
  52 /* ASAN ABI version. */
  53 #if defined(__clang__) && (__clang_major__ - 0 >= 6)
  54 #define ASAN_ABI_VERSION        8
  55 #elif __GNUC_PREREQ__(7, 1) && !defined(__clang__)
  56 #define ASAN_ABI_VERSION        8
  57 #elif __GNUC_PREREQ__(6, 1) && !defined(__clang__)
  58 #define ASAN_ABI_VERSION        6
  59 #else
  60 #error "Unsupported compiler version"
  61 #endif
  62
  63 #define __RET_ADDR      (unsigned long)__builtin_return_address(0)
  64
  65 /* Global variable descriptor. Part of the compiler ABI.  */
  66 struct __asan_global_source_location {
  67         const char *filename;
  68         int line_no;
  69         int column_no;
  70 };
  71
  72 struct __asan_global {
  73         const void *beg;                /* address of the global variable */
  74         size_t size;                    /* size of the global variable */
  75         size_t size_with_redzone;       /* size with the redzone */
  76         const void *name;               /* name of the variable */
  77         const void *module_name;        /* name of the module where the var is declared */
  78         unsigned long has_dynamic_init; /* the var has dyn initializer (c++) */
  79         struct __asan_global_source_location *location;
  80 #if ASAN_ABI_VERSION >= 7
  81         uintptr_t odr_indicator;        /* the address of the ODR indicator symbol */
  82 #endif
  83 };
  84
  85 FEATURE(kasan, "Kernel address sanitizer");
  86
  87 static SYSCTL_NODE(_debug, OID_AUTO, kasan, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
  88     "KASAN options");
  89
  90 static int panic_on_violation = 1;
  91 SYSCTL_INT(_debug_kasan, OID_AUTO, panic_on_violation, CTLFLAG_RDTUN,
  92     &panic_on_violation, 0,
  93     "Panic if an invalid access is detected");
  94
  95 static bool kasan_enabled __read_mostly = false;
  96
  97 /* -------------------------------------------------------------------------- */
  98
  99 void
 100 kasan_shadow_map(vm_offset_t addr, size_t size)
 101 {
 102         size_t sz, npages, i;
 103         vm_offset_t sva, eva;
 104
 105         KASSERT(addr % KASAN_SHADOW_SCALE == 0,
 106             ("%s: invalid address %#lx", __func__, addr));
 107
 108         sz = roundup(size, KASAN_SHADOW_SCALE) / KASAN_SHADOW_SCALE;
 109
 110         sva = kasan_md_addr_to_shad(addr);
 111         eva = kasan_md_addr_to_shad(addr) + sz;
 112
 113         sva = rounddown(sva, PAGE_SIZE);
 114         eva = roundup(eva, PAGE_SIZE);
 115
 116         npages = (eva - sva) / PAGE_SIZE;
 117
 118         KASSERT(sva >= KASAN_MIN_ADDRESS && eva < KASAN_MAX_ADDRESS,
 119             ("%s: invalid address range %#lx-%#lx", __func__, sva, eva));
 120
 121         for (i = 0; i < npages; i++)
 122                 pmap_san_enter(sva + ptoa(i));
 123 }
 124
 125 void
 126 kasan_init(void)
 127 {
 128         int disabled;
 129
 130         disabled = 0;
 131         TUNABLE_INT_FETCH("debug.kasan.disabled", &disabled);
 132         if (disabled)
 133                 return;
 134
 135         /* MD initialization. */
 136         kasan_md_init();
 137
 138         /* Now officially enabled. */
 139         kasan_enabled = true;
 140 }
 141
 142 void
 143 kasan_init_early(vm_offset_t stack, size_t size)
 144 {
 145         kasan_md_init_early(stack, size);
 146 }
 147
 148 static inline const char *
 149 kasan_code_name(uint8_t code)
 150 {
 151         switch (code) {
 152         case KASAN_GENERIC_REDZONE:
 153                 return "GenericRedZone";
 154         case KASAN_MALLOC_REDZONE:
 155                 return "MallocRedZone";
 156         case KASAN_KMEM_REDZONE:
 157                 return "KmemRedZone";
 158         case KASAN_UMA_FREED:
 159                 return "UMAUseAfterFree";
 160         case KASAN_KSTACK_FREED:
 161                 return "KernelStack";
 162         case KASAN_EXEC_ARGS_FREED:
 163                 return "ExecKVA";
 164         case 1 ... 7:
 165                 return "RedZonePartial";
 166         case KASAN_STACK_LEFT:
 167                 return "StackLeft";
 168         case KASAN_STACK_MID:
 169                 return "StackMiddle";
 170         case KASAN_STACK_RIGHT:
 171                 return "StackRight";
 172         case KASAN_USE_AFTER_RET:
 173                 return "UseAfterRet";
 174         case KASAN_USE_AFTER_SCOPE:
 175                 return "UseAfterScope";
 176         default:
 177                 return "Unknown";
 178         }
 179 }
 180
 181 #define REPORT(f, ...) do {                             \
 182         if (panic_on_violation) {                       \
 183                 kasan_enabled = false;                  \
 184                 panic(f, __VA_ARGS__);                  \
 185         } else {                                        \
 186                 struct stack st;                        \
 187                                                         \
 188                 stack_save(&st);                        \
 189                 printf(f "\n", __VA_ARGS__);            \
 190                 stack_print_ddb(&st);                   \
 191         }                                               \
 192 } while (0)
 193
 194 static void
 195 kasan_report(unsigned long addr, size_t size, bool write, unsigned long pc,
 196     uint8_t code)
 197 {
 198         REPORT("ASan: Invalid access, %zu-byte %s at %#lx, %s(%x)",
 199             size, (write ? "write" : "read"), addr, kasan_code_name(code),
 200             code);
 201 }
 202
 203 static __always_inline void
 204 kasan_shadow_1byte_markvalid(unsigned long addr)
 205 {
 206         int8_t *byte = (int8_t *)kasan_md_addr_to_shad(addr);
 207         int8_t last = (addr & KASAN_SHADOW_MASK) + 1;
 208
 209         *byte = last;
 210 }
 211
 212 static __always_inline void
 213 kasan_shadow_Nbyte_markvalid(const void *addr, size_t size)
 214 {
 215         size_t i;
 216
 217         for (i = 0; i < size; i++) {
 218                 kasan_shadow_1byte_markvalid((unsigned long)addr + i);
 219         }
 220 }
 221
 222 static __always_inline void
 223 kasan_shadow_Nbyte_fill(const void *addr, size_t size, uint8_t code)
 224 {
 225         void *shad;
 226
 227         if (__predict_false(size == 0))
 228                 return;
 229         if (__predict_false(kasan_md_unsupported((vm_offset_t)addr)))
 230                 return;
 231
 232         KASSERT((vm_offset_t)addr % KASAN_SHADOW_SCALE == 0,
 233             ("%s: invalid address %p", __func__, addr));
 234         KASSERT(size % KASAN_SHADOW_SCALE == 0,
 235             ("%s: invalid size %zu", __func__, size));
 236
 237         shad = (void *)kasan_md_addr_to_shad((uintptr_t)addr);
 238         size = size >> KASAN_SHADOW_SCALE_SHIFT;
 239
 240         __builtin_memset(shad, code, size);
 241 }
 242
 243 /*
 244  * In an area of size 'sz_with_redz', mark the 'size' first bytes as valid,
 245  * and the rest as invalid. There are generally two use cases:
 246  *
 247  *  o kasan_mark(addr, origsize, size, code), with origsize < size. This marks
 248  *    the redzone at the end of the buffer as invalid. If the entire is to be
 249  *    marked invalid, origsize will be 0.
 250  *
 251  *  o kasan_mark(addr, size, size, 0). This marks the entire buffer as valid.
 252  */
 253 void
 254 kasan_mark(const void *addr, size_t size, size_t redzsize, uint8_t code)
 255 {
 256         size_t i, n, redz;
 257         int8_t *shad;
 258
 259         if ((vm_offset_t)addr >= DMAP_MIN_ADDRESS &&
 260             (vm_offset_t)addr < DMAP_MAX_ADDRESS)
 261                 return;
 262
 263         KASSERT((vm_offset_t)addr >= VM_MIN_KERNEL_ADDRESS &&
 264             (vm_offset_t)addr < VM_MAX_KERNEL_ADDRESS,
 265             ("%s: invalid address %p", __func__, addr));
 266         KASSERT((vm_offset_t)addr % KASAN_SHADOW_SCALE == 0,
 267             ("%s: invalid address %p", __func__, addr));
 268         redz = redzsize - roundup(size, KASAN_SHADOW_SCALE);
 269         KASSERT(redz % KASAN_SHADOW_SCALE == 0,
 270             ("%s: invalid size %zu", __func__, redz));
 271         shad = (int8_t *)kasan_md_addr_to_shad((uintptr_t)addr);
 272
 273         /* Chunks of 8 bytes, valid. */
 274         n = size / KASAN_SHADOW_SCALE;
 275         for (i = 0; i < n; i++) {
 276                 *shad++ = 0;
 277         }
 278
 279         /* Possibly one chunk, mid. */
 280         if ((size & KASAN_SHADOW_MASK) != 0) {
 281                 *shad++ = (size & KASAN_SHADOW_MASK);
 282         }
 283
 284         /* Chunks of 8 bytes, invalid. */
 285         n = redz / KASAN_SHADOW_SCALE;
 286         for (i = 0; i < n; i++) {
 287                 *shad++ = code;
 288         }
 289 }
 290
 291 /* -------------------------------------------------------------------------- */
 292
 293 #define ADDR_CROSSES_SCALE_BOUNDARY(addr, size)                 \
 294         (addr >> KASAN_SHADOW_SCALE_SHIFT) !=                   \
 295             ((addr + size - 1) >> KASAN_SHADOW_SCALE_SHIFT)
 296
 297 static __always_inline bool
 298 kasan_shadow_1byte_isvalid(unsigned long addr, uint8_t *code)
 299 {
 300         int8_t *byte = (int8_t *)kasan_md_addr_to_shad(addr);
 301         int8_t last = (addr & KASAN_SHADOW_MASK) + 1;
 302
 303         if (__predict_true(*byte == 0 || last <= *byte)) {
 304                 return (true);
 305         }
 306         *code = *byte;
 307         return (false);
 308 }
 309
 310 static __always_inline bool
 311 kasan_shadow_2byte_isvalid(unsigned long addr, uint8_t *code)
 312 {
 313         int8_t *byte, last;
 314
 315         if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 2)) {
 316                 return (kasan_shadow_1byte_isvalid(addr, code) &&
 317                     kasan_shadow_1byte_isvalid(addr+1, code));
 318         }
 319
 320         byte = (int8_t *)kasan_md_addr_to_shad(addr);
 321         last = ((addr + 1) & KASAN_SHADOW_MASK) + 1;
 322
 323         if (__predict_true(*byte == 0 || last <= *byte)) {
 324                 return (true);
 325         }
 326         *code = *byte;
 327         return (false);
 328 }
 329
 330 static __always_inline bool
 331 kasan_shadow_4byte_isvalid(unsigned long addr, uint8_t *code)
 332 {
 333         int8_t *byte, last;
 334
 335         if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 4)) {
 336                 return (kasan_shadow_2byte_isvalid(addr, code) &&
 337                     kasan_shadow_2byte_isvalid(addr+2, code));
 338         }
 339
 340         byte = (int8_t *)kasan_md_addr_to_shad(addr);
 341         last = ((addr + 3) & KASAN_SHADOW_MASK) + 1;
 342
 343         if (__predict_true(*byte == 0 || last <= *byte)) {
 344                 return (true);
 345         }
 346         *code = *byte;
 347         return (false);
 348 }
 349
 350 static __always_inline bool
 351 kasan_shadow_8byte_isvalid(unsigned long addr, uint8_t *code)
 352 {
 353         int8_t *byte, last;
 354
 355         if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 8)) {
 356                 return (kasan_shadow_4byte_isvalid(addr, code) &&
 357                     kasan_shadow_4byte_isvalid(addr+4, code));
 358         }
 359
 360         byte = (int8_t *)kasan_md_addr_to_shad(addr);
 361         last = ((addr + 7) & KASAN_SHADOW_MASK) + 1;
 362
 363         if (__predict_true(*byte == 0 || last <= *byte)) {
 364                 return (true);
 365         }
 366         *code = *byte;
 367         return (false);
 368 }
 369
 370 static __always_inline bool
 371 kasan_shadow_Nbyte_isvalid(unsigned long addr, size_t size, uint8_t *code)
 372 {
 373         size_t i;
 374
 375         for (i = 0; i < size; i++) {
 376                 if (!kasan_shadow_1byte_isvalid(addr+i, code))
 377                         return (false);
 378         }
 379
 380         return (true);
 381 }
 382
 383 static __always_inline void
 384 kasan_shadow_check(unsigned long addr, size_t size, bool write,
 385     unsigned long retaddr)
 386 {
 387         uint8_t code;
 388         bool valid;
 389
 390         if (__predict_false(!kasan_enabled))
 391                 return;
 392         if (__predict_false(size == 0))
 393                 return;
 394         if (__predict_false(kasan_md_unsupported(addr)))
 395                 return;
 396         if (KERNEL_PANICKED())
 397                 return;
 398
 399         if (__builtin_constant_p(size)) {
 400                 switch (size) {
 401                 case 1:
 402                         valid = kasan_shadow_1byte_isvalid(addr, &code);
 403                         break;
 404                 case 2:
 405                         valid = kasan_shadow_2byte_isvalid(addr, &code);
 406                         break;
 407                 case 4:
 408                         valid = kasan_shadow_4byte_isvalid(addr, &code);
 409                         break;
 410                 case 8:
 411                         valid = kasan_shadow_8byte_isvalid(addr, &code);
 412                         break;
 413                 default:
 414                         valid = kasan_shadow_Nbyte_isvalid(addr, size, &code);
 415                         break;
 416                 }
 417         } else {
 418                 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code);
 419         }
 420
 421         if (__predict_false(!valid)) {
 422                 kasan_report(addr, size, write, retaddr, code);
 423         }
 424 }
 425
 426 /* -------------------------------------------------------------------------- */
 427
 428 void *
 429 kasan_memcpy(void *dst, const void *src, size_t len)
 430 {
 431         kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR);
 432         kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR);
 433         return (__builtin_memcpy(dst, src, len));
 434 }
 435
 436 int
 437 kasan_memcmp(const void *b1, const void *b2, size_t len)
 438 {
 439         kasan_shadow_check((unsigned long)b1, len, false, __RET_ADDR);
 440         kasan_shadow_check((unsigned long)b2, len, false, __RET_ADDR);
 441         return (__builtin_memcmp(b1, b2, len));
 442 }
 443
 444 void *
 445 kasan_memset(void *b, int c, size_t len)
 446 {
 447         kasan_shadow_check((unsigned long)b, len, true, __RET_ADDR);
 448         return (__builtin_memset(b, c, len));
 449 }
 450
 451 void *
 452 kasan_memmove(void *dst, const void *src, size_t len)
 453 {
 454         kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR);
 455         kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR);
 456         return (__builtin_memmove(dst, src, len));
 457 }
 458
 459 size_t
 460 kasan_strlen(const char *str)
 461 {
 462         const char *s;
 463
 464         s = str;
 465         while (1) {
 466                 kasan_shadow_check((unsigned long)s, 1, false, __RET_ADDR);
 467                 if (*s == '\0')
 468                         break;
 469                 s++;
 470         }
 471
 472         return (s - str);
 473 }
 474
 475 char *
 476 kasan_strcpy(char *dst, const char *src)
 477 {
 478         char *save = dst;
 479
 480         while (1) {
 481                 kasan_shadow_check((unsigned long)src, 1, false, __RET_ADDR);
 482                 kasan_shadow_check((unsigned long)dst, 1, true, __RET_ADDR);
 483                 *dst = *src;
 484                 if (*src == '\0')
 485                         break;
 486                 src++, dst++;
 487         }
 488
 489         return save;
 490 }
 491
 492 int
 493 kasan_strcmp(const char *s1, const char *s2)
 494 {
 495         while (1) {
 496                 kasan_shadow_check((unsigned long)s1, 1, false, __RET_ADDR);
 497                 kasan_shadow_check((unsigned long)s2, 1, false, __RET_ADDR);
 498                 if (*s1 != *s2)
 499                         break;
 500                 if (*s1 == '\0')
 501                         return 0;
 502                 s1++, s2++;
 503         }
 504
 505         return (*(const unsigned char *)s1 - *(const unsigned char *)s2);
 506 }
 507
 508 int
 509 kasan_copyin(const void *uaddr, void *kaddr, size_t len)
 510 {
 511         kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR);
 512         return (copyin(uaddr, kaddr, len));
 513 }
 514
 515 int
 516 kasan_copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done)
 517 {
 518         kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR);
 519         return (copyinstr(uaddr, kaddr, len, done));
 520 }
 521
 522 int
 523 kasan_copyout(const void *kaddr, void *uaddr, size_t len)
 524 {
 525         kasan_shadow_check((unsigned long)kaddr, len, false, __RET_ADDR);
 526         return (copyout(kaddr, uaddr, len));
 527 }
 528
 529 /* -------------------------------------------------------------------------- */
 530
 531 int
 532 kasan_fubyte(volatile const void *base)
 533 {
 534         return (fubyte(base));
 535 }
 536
 537 int
 538 kasan_fuword16(volatile const void *base)
 539 {
 540         return (fuword16(base));
 541 }
 542
 543 int
 544 kasan_fueword(volatile const void *base, long *val)
 545 {
 546         kasan_shadow_check((unsigned long)val, sizeof(*val), true, __RET_ADDR);
 547         return (fueword(base, val));
 548 }
 549
 550 int
 551 kasan_fueword32(volatile const void *base, int32_t *val)
 552 {
 553         kasan_shadow_check((unsigned long)val, sizeof(*val), true, __RET_ADDR);
 554         return (fueword32(base, val));
 555 }
 556
 557 int
 558 kasan_fueword64(volatile const void *base, int64_t *val)
 559 {
 560         kasan_shadow_check((unsigned long)val, sizeof(*val), true, __RET_ADDR);
 561         return (fueword64(base, val));
 562 }
 563
 564 int
 565 kasan_subyte(volatile void *base, int byte)
 566 {
 567         return (subyte(base, byte));
 568 }
 569
 570 int
 571 kasan_suword(volatile void *base, long word)
 572 {
 573         return (suword(base, word));
 574 }
 575
 576 int
 577 kasan_suword16(volatile void *base, int word)
 578 {
 579         return (suword16(base, word));
 580 }
 581
 582 int
 583 kasan_suword32(volatile void *base, int32_t word)
 584 {
 585         return (suword32(base, word));
 586 }
 587
 588 int
 589 kasan_suword64(volatile void *base, int64_t word)
 590 {
 591         return (suword64(base, word));
 592 }
 593
 594 int
 595 kasan_casueword32(volatile uint32_t *base, uint32_t oldval, uint32_t *oldvalp,
 596     uint32_t newval)
 597 {
 598         kasan_shadow_check((unsigned long)oldvalp, sizeof(*oldvalp), true,
 599             __RET_ADDR);
 600         return (casueword32(base, oldval, oldvalp, newval));
 601 }
 602
 603 int
 604 kasan_casueword(volatile u_long *base, u_long oldval, u_long *oldvalp,
 605     u_long newval)
 606 {
 607         kasan_shadow_check((unsigned long)oldvalp, sizeof(*oldvalp), true,
 608             __RET_ADDR);
 609         return (casueword(base, oldval, oldvalp, newval));
 610 }
 611
 612 /* -------------------------------------------------------------------------- */
 613
 614 #include <machine/atomic.h>
 615 #include <sys/atomic_san.h>
 616
 617 #define _ASAN_ATOMIC_FUNC_ADD(name, type)                               \
 618         void kasan_atomic_add_##name(volatile type *ptr, type val)      \
 619         {                                                               \
 620                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 621                     __RET_ADDR);                                        \
 622                 atomic_add_##name(ptr, val);                            \
 623         }
 624
 625 #define ASAN_ATOMIC_FUNC_ADD(name, type)                                \
 626         _ASAN_ATOMIC_FUNC_ADD(name, type)                               \
 627         _ASAN_ATOMIC_FUNC_ADD(acq_##name, type)                         \
 628         _ASAN_ATOMIC_FUNC_ADD(rel_##name, type)
 629
 630 #define _ASAN_ATOMIC_FUNC_SUBTRACT(name, type)                          \
 631         void kasan_atomic_subtract_##name(volatile type *ptr, type val) \
 632         {                                                               \
 633                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 634                     __RET_ADDR);                                        \
 635                 atomic_subtract_##name(ptr, val);                       \
 636         }
 637
 638 #define ASAN_ATOMIC_FUNC_SUBTRACT(name, type)                           \
 639         _ASAN_ATOMIC_FUNC_SUBTRACT(name, type)                          \
 640         _ASAN_ATOMIC_FUNC_SUBTRACT(acq_##name, type)                    \
 641         _ASAN_ATOMIC_FUNC_SUBTRACT(rel_##name, type)
 642
 643 #define _ASAN_ATOMIC_FUNC_SET(name, type)                               \
 644         void kasan_atomic_set_##name(volatile type *ptr, type val)      \
 645         {                                                               \
 646                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 647                     __RET_ADDR);                                        \
 648                 atomic_set_##name(ptr, val);                            \
 649         }
 650
 651 #define ASAN_ATOMIC_FUNC_SET(name, type)                                \
 652         _ASAN_ATOMIC_FUNC_SET(name, type)                               \
 653         _ASAN_ATOMIC_FUNC_SET(acq_##name, type)                         \
 654         _ASAN_ATOMIC_FUNC_SET(rel_##name, type)
 655
 656 #define _ASAN_ATOMIC_FUNC_CLEAR(name, type)                             \
 657         void kasan_atomic_clear_##name(volatile type *ptr, type val)    \
 658         {                                                               \
 659                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 660                     __RET_ADDR);                                        \
 661                 atomic_clear_##name(ptr, val);                          \
 662         }
 663
 664 #define ASAN_ATOMIC_FUNC_CLEAR(name, type)                              \
 665         _ASAN_ATOMIC_FUNC_CLEAR(name, type)                             \
 666         _ASAN_ATOMIC_FUNC_CLEAR(acq_##name, type)                       \
 667         _ASAN_ATOMIC_FUNC_CLEAR(rel_##name, type)
 668
 669 #define ASAN_ATOMIC_FUNC_FETCHADD(name, type)                           \
 670         type kasan_atomic_fetchadd_##name(volatile type *ptr, type val) \
 671         {                                                               \
 672                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 673                     __RET_ADDR);                                        \
 674                 return (atomic_fetchadd_##name(ptr, val));              \
 675         }
 676
 677 #define ASAN_ATOMIC_FUNC_READANDCLEAR(name, type)                       \
 678         type kasan_atomic_readandclear_##name(volatile type *ptr)       \
 679         {                                                               \
 680                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 681                     __RET_ADDR);                                        \
 682                 return (atomic_readandclear_##name(ptr));               \
 683         }
 684
 685 #define ASAN_ATOMIC_FUNC_TESTANDCLEAR(name, type)                       \
 686         int kasan_atomic_testandclear_##name(volatile type *ptr, u_int v) \
 687         {                                                               \
 688                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 689                     __RET_ADDR);                                        \
 690                 return (atomic_testandclear_##name(ptr, v));            \
 691         }
 692
 693 #define ASAN_ATOMIC_FUNC_TESTANDSET(name, type)                         \
 694         int kasan_atomic_testandset_##name(volatile type *ptr, u_int v) \
 695         {                                                               \
 696                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 697                     __RET_ADDR);                                        \
 698                 return (atomic_testandset_##name(ptr, v));              \
 699         }
 700
 701 #define ASAN_ATOMIC_FUNC_SWAP(name, type)                               \
 702         type kasan_atomic_swap_##name(volatile type *ptr, type val)     \
 703         {                                                               \
 704                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 705                     __RET_ADDR);                                        \
 706                 return (atomic_swap_##name(ptr, val));                  \
 707         }
 708
 709 #define _ASAN_ATOMIC_FUNC_CMPSET(name, type)                            \
 710         int kasan_atomic_cmpset_##name(volatile type *ptr, type oval,   \
 711             type nval)                                                  \
 712         {                                                               \
 713                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 714                     __RET_ADDR);                                        \
 715                 return (atomic_cmpset_##name(ptr, oval, nval));         \
 716         }
 717
 718 #define ASAN_ATOMIC_FUNC_CMPSET(name, type)                             \
 719         _ASAN_ATOMIC_FUNC_CMPSET(name, type)                            \
 720         _ASAN_ATOMIC_FUNC_CMPSET(acq_##name, type)                      \
 721         _ASAN_ATOMIC_FUNC_CMPSET(rel_##name, type)
 722
 723 #define _ASAN_ATOMIC_FUNC_FCMPSET(name, type)                           \
 724         int kasan_atomic_fcmpset_##name(volatile type *ptr, type *oval, \
 725             type nval)                                                  \
 726         {                                                               \
 727                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 728                     __RET_ADDR);                                        \
 729                 return (atomic_fcmpset_##name(ptr, oval, nval));        \
 730         }
 731
 732 #define ASAN_ATOMIC_FUNC_FCMPSET(name, type)                            \
 733         _ASAN_ATOMIC_FUNC_FCMPSET(name, type)                           \
 734         _ASAN_ATOMIC_FUNC_FCMPSET(acq_##name, type)                     \
 735         _ASAN_ATOMIC_FUNC_FCMPSET(rel_##name, type)
 736
 737 #define ASAN_ATOMIC_FUNC_THREAD_FENCE(name)                             \
 738         void kasan_atomic_thread_fence_##name(void)                     \
 739         {                                                               \
 740                 atomic_thread_fence_##name();                           \
 741         }
 742
 743 #define _ASAN_ATOMIC_FUNC_LOAD(name, type)                              \
 744         type kasan_atomic_load_##name(volatile type *ptr)               \
 745         {                                                               \
 746                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 747                     __RET_ADDR);                                        \
 748                 return (atomic_load_##name(ptr));                       \
 749         }
 750
 751 #define ASAN_ATOMIC_FUNC_LOAD(name, type)                               \
 752         _ASAN_ATOMIC_FUNC_LOAD(name, type)                              \
 753         _ASAN_ATOMIC_FUNC_LOAD(acq_##name, type)
 754
 755 #define _ASAN_ATOMIC_FUNC_STORE(name, type)                             \
 756         void kasan_atomic_store_##name(volatile type *ptr, type val)    \
 757         {                                                               \
 758                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 759                     __RET_ADDR);                                        \
 760                 atomic_store_##name(ptr, val);                          \
 761         }
 762
 763 #define ASAN_ATOMIC_FUNC_STORE(name, type)                              \
 764         _ASAN_ATOMIC_FUNC_STORE(name, type)                             \
 765         _ASAN_ATOMIC_FUNC_STORE(rel_##name, type)
 766
 767 ASAN_ATOMIC_FUNC_ADD(8, uint8_t);
 768 ASAN_ATOMIC_FUNC_ADD(16, uint16_t);
 769 ASAN_ATOMIC_FUNC_ADD(32, uint32_t);
 770 ASAN_ATOMIC_FUNC_ADD(64, uint64_t);
 771 ASAN_ATOMIC_FUNC_ADD(int, u_int);
 772 ASAN_ATOMIC_FUNC_ADD(long, u_long);
 773 ASAN_ATOMIC_FUNC_ADD(ptr, uintptr_t);
 774
 775 ASAN_ATOMIC_FUNC_SUBTRACT(8, uint8_t);
 776 ASAN_ATOMIC_FUNC_SUBTRACT(16, uint16_t);
 777 ASAN_ATOMIC_FUNC_SUBTRACT(32, uint32_t);
 778 ASAN_ATOMIC_FUNC_SUBTRACT(64, uint64_t);
 779 ASAN_ATOMIC_FUNC_SUBTRACT(int, u_int);
 780 ASAN_ATOMIC_FUNC_SUBTRACT(long, u_long);
 781 ASAN_ATOMIC_FUNC_SUBTRACT(ptr, uintptr_t);
 782
 783 ASAN_ATOMIC_FUNC_SET(8, uint8_t);
 784 ASAN_ATOMIC_FUNC_SET(16, uint16_t);
 785 ASAN_ATOMIC_FUNC_SET(32, uint32_t);
 786 ASAN_ATOMIC_FUNC_SET(64, uint64_t);
 787 ASAN_ATOMIC_FUNC_SET(int, u_int);
 788 ASAN_ATOMIC_FUNC_SET(long, u_long);
 789 ASAN_ATOMIC_FUNC_SET(ptr, uintptr_t);
 790
 791 ASAN_ATOMIC_FUNC_CLEAR(8, uint8_t);
 792 ASAN_ATOMIC_FUNC_CLEAR(16, uint16_t);
 793 ASAN_ATOMIC_FUNC_CLEAR(32, uint32_t);
 794 ASAN_ATOMIC_FUNC_CLEAR(64, uint64_t);
 795 ASAN_ATOMIC_FUNC_CLEAR(int, u_int);
 796 ASAN_ATOMIC_FUNC_CLEAR(long, u_long);
 797 ASAN_ATOMIC_FUNC_CLEAR(ptr, uintptr_t);
 798
 799 ASAN_ATOMIC_FUNC_FETCHADD(32, uint32_t);
 800 ASAN_ATOMIC_FUNC_FETCHADD(64, uint64_t);
 801 ASAN_ATOMIC_FUNC_FETCHADD(int, u_int);
 802 ASAN_ATOMIC_FUNC_FETCHADD(long, u_long);
 803
 804 ASAN_ATOMIC_FUNC_READANDCLEAR(32, uint32_t);
 805 ASAN_ATOMIC_FUNC_READANDCLEAR(64, uint64_t);
 806 ASAN_ATOMIC_FUNC_READANDCLEAR(int, u_int);
 807 ASAN_ATOMIC_FUNC_READANDCLEAR(long, u_long);
 808 ASAN_ATOMIC_FUNC_READANDCLEAR(ptr, uintptr_t);
 809
 810 ASAN_ATOMIC_FUNC_TESTANDCLEAR(32, uint32_t);
 811 ASAN_ATOMIC_FUNC_TESTANDCLEAR(64, uint64_t);
 812 ASAN_ATOMIC_FUNC_TESTANDCLEAR(int, u_int);
 813 ASAN_ATOMIC_FUNC_TESTANDCLEAR(long, u_long);
 814
 815 ASAN_ATOMIC_FUNC_TESTANDSET(32, uint32_t);
 816 ASAN_ATOMIC_FUNC_TESTANDSET(64, uint64_t);
 817 ASAN_ATOMIC_FUNC_TESTANDSET(int, u_int);
 818 ASAN_ATOMIC_FUNC_TESTANDSET(long, u_long);
 819
 820 ASAN_ATOMIC_FUNC_SWAP(32, uint32_t);
 821 ASAN_ATOMIC_FUNC_SWAP(64, uint64_t);
 822 ASAN_ATOMIC_FUNC_SWAP(int, u_int);
 823 ASAN_ATOMIC_FUNC_SWAP(long, u_long);
 824 ASAN_ATOMIC_FUNC_SWAP(ptr, uintptr_t);
 825
 826 ASAN_ATOMIC_FUNC_CMPSET(8, uint8_t);
 827 ASAN_ATOMIC_FUNC_CMPSET(16, uint16_t);
 828 ASAN_ATOMIC_FUNC_CMPSET(32, uint32_t);
 829 ASAN_ATOMIC_FUNC_CMPSET(64, uint64_t);
 830 ASAN_ATOMIC_FUNC_CMPSET(int, u_int);
 831 ASAN_ATOMIC_FUNC_CMPSET(long, u_long);
 832 ASAN_ATOMIC_FUNC_CMPSET(ptr, uintptr_t);
 833
 834 ASAN_ATOMIC_FUNC_FCMPSET(8, uint8_t);
 835 ASAN_ATOMIC_FUNC_FCMPSET(16, uint16_t);
 836 ASAN_ATOMIC_FUNC_FCMPSET(32, uint32_t);
 837 ASAN_ATOMIC_FUNC_FCMPSET(64, uint64_t);
 838 ASAN_ATOMIC_FUNC_FCMPSET(int, u_int);
 839 ASAN_ATOMIC_FUNC_FCMPSET(long, u_long);
 840 ASAN_ATOMIC_FUNC_FCMPSET(ptr, uintptr_t);
 841
 842 ASAN_ATOMIC_FUNC_LOAD(8, uint8_t);
 843 ASAN_ATOMIC_FUNC_LOAD(16, uint16_t);
 844 ASAN_ATOMIC_FUNC_LOAD(32, uint32_t);
 845 ASAN_ATOMIC_FUNC_LOAD(64, uint64_t);
 846 ASAN_ATOMIC_FUNC_LOAD(char, u_char);
 847 ASAN_ATOMIC_FUNC_LOAD(short, u_short);
 848 ASAN_ATOMIC_FUNC_LOAD(int, u_int);
 849 ASAN_ATOMIC_FUNC_LOAD(long, u_long);
 850 ASAN_ATOMIC_FUNC_LOAD(ptr, uintptr_t);
 851
 852 ASAN_ATOMIC_FUNC_STORE(8, uint8_t);
 853 ASAN_ATOMIC_FUNC_STORE(16, uint16_t);
 854 ASAN_ATOMIC_FUNC_STORE(32, uint32_t);
 855 ASAN_ATOMIC_FUNC_STORE(64, uint64_t);
 856 ASAN_ATOMIC_FUNC_STORE(char, u_char);
 857 ASAN_ATOMIC_FUNC_STORE(short, u_short);
 858 ASAN_ATOMIC_FUNC_STORE(int, u_int);
 859 ASAN_ATOMIC_FUNC_STORE(long, u_long);
 860 ASAN_ATOMIC_FUNC_STORE(ptr, uintptr_t);
 861
 862 ASAN_ATOMIC_FUNC_THREAD_FENCE(acq);
 863 ASAN_ATOMIC_FUNC_THREAD_FENCE(rel);
 864 ASAN_ATOMIC_FUNC_THREAD_FENCE(acq_rel);
 865 ASAN_ATOMIC_FUNC_THREAD_FENCE(seq_cst);
 866
 867 void
 868 kasan_atomic_interrupt_fence(void)
 869 {
 870 }
 871
 872 /* -------------------------------------------------------------------------- */
 873
 874 #include <sys/bus.h>
 875 #include <machine/bus.h>
 876 #include <sys/bus_san.h>
 877
 878 int
 879 kasan_bus_space_map(bus_space_tag_t tag, bus_addr_t hnd, bus_size_t size,
 880     int flags, bus_space_handle_t *handlep)
 881 {
 882         return (bus_space_map(tag, hnd, size, flags, handlep));
 883 }
 884
 885 void
 886 kasan_bus_space_unmap(bus_space_tag_t tag, bus_space_handle_t hnd,
 887     bus_size_t size)
 888 {
 889         bus_space_unmap(tag, hnd, size);
 890 }
 891
 892 int
 893 kasan_bus_space_subregion(bus_space_tag_t tag, bus_space_handle_t hnd,
 894     bus_size_t offset, bus_size_t size, bus_space_handle_t *handlep)
 895 {
 896         return (bus_space_subregion(tag, hnd, offset, size, handlep));
 897 }
 898
 899 void
 900 kasan_bus_space_free(bus_space_tag_t tag, bus_space_handle_t hnd,
 901     bus_size_t size)
 902 {
 903         bus_space_free(tag, hnd, size);
 904 }
 905
 906 void
 907 kasan_bus_space_barrier(bus_space_tag_t tag, bus_space_handle_t hnd,
 908     bus_size_t offset, bus_size_t size, int flags)
 909 {
 910         bus_space_barrier(tag, hnd, offset, size, flags);
 911 }
 912
 913 #define ASAN_BUS_READ_FUNC(func, width, type)                           \
 914         type kasan_bus_space_read##func##_##width(bus_space_tag_t tag,  \
 915             bus_space_handle_t hnd, bus_size_t offset)                  \
 916         {                                                               \
 917                 return (bus_space_read##func##_##width(tag, hnd,        \
 918                     offset));                                           \
 919         }                                                               \
 920
 921 #define ASAN_BUS_READ_PTR_FUNC(func, width, type)                       \
 922         void kasan_bus_space_read_##func##_##width(bus_space_tag_t tag, \
 923             bus_space_handle_t hnd, bus_size_t size, type *buf,         \
 924             bus_size_t count)                                           \
 925         {                                                               \
 926                 kasan_shadow_check((uintptr_t)buf, sizeof(type) * count,\
 927                     false, __RET_ADDR);                                 \
 928                 bus_space_read_##func##_##width(tag, hnd, size, buf,    \
 929                     count);                                             \
 930         }
 931
 932 ASAN_BUS_READ_FUNC(, 1, uint8_t)
 933 ASAN_BUS_READ_FUNC(_stream, 1, uint8_t)
 934 ASAN_BUS_READ_PTR_FUNC(multi, 1, uint8_t)
 935 ASAN_BUS_READ_PTR_FUNC(multi_stream, 1, uint8_t)
 936 ASAN_BUS_READ_PTR_FUNC(region, 1, uint8_t)
 937 ASAN_BUS_READ_PTR_FUNC(region_stream, 1, uint8_t)
 938
 939 ASAN_BUS_READ_FUNC(, 2, uint16_t)
 940 ASAN_BUS_READ_FUNC(_stream, 2, uint16_t)
 941 ASAN_BUS_READ_PTR_FUNC(multi, 2, uint16_t)
 942 ASAN_BUS_READ_PTR_FUNC(multi_stream, 2, uint16_t)
 943 ASAN_BUS_READ_PTR_FUNC(region, 2, uint16_t)
 944 ASAN_BUS_READ_PTR_FUNC(region_stream, 2, uint16_t)
 945
 946 ASAN_BUS_READ_FUNC(, 4, uint32_t)
 947 ASAN_BUS_READ_FUNC(_stream, 4, uint32_t)
 948 ASAN_BUS_READ_PTR_FUNC(multi, 4, uint32_t)
 949 ASAN_BUS_READ_PTR_FUNC(multi_stream, 4, uint32_t)
 950 ASAN_BUS_READ_PTR_FUNC(region, 4, uint32_t)
 951 ASAN_BUS_READ_PTR_FUNC(region_stream, 4, uint32_t)
 952
 953 ASAN_BUS_READ_FUNC(, 8, uint64_t)
 954
 955 #define ASAN_BUS_WRITE_FUNC(func, width, type)                          \
 956         void kasan_bus_space_write##func##_##width(bus_space_tag_t tag, \
 957             bus_space_handle_t hnd, bus_size_t offset, type value)      \
 958         {                                                               \
 959                 bus_space_write##func##_##width(tag, hnd, offset, value);\
 960         }                                                               \
 961
 962 #define ASAN_BUS_WRITE_PTR_FUNC(func, width, type)                      \
 963         void kasan_bus_space_write_##func##_##width(bus_space_tag_t tag,\
 964             bus_space_handle_t hnd, bus_size_t size, const type *buf,   \
 965             bus_size_t count)                                           \
 966         {                                                               \
 967                 kasan_shadow_check((uintptr_t)buf, sizeof(type) * count,\
 968                     true, __RET_ADDR);                                  \
 969                 bus_space_write_##func##_##width(tag, hnd, size, buf,   \
 970                     count);                                             \
 971         }
 972
 973 ASAN_BUS_WRITE_FUNC(, 1, uint8_t)
 974 ASAN_BUS_WRITE_FUNC(_stream, 1, uint8_t)
 975 ASAN_BUS_WRITE_PTR_FUNC(multi, 1, uint8_t)
 976 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 1, uint8_t)
 977 ASAN_BUS_WRITE_PTR_FUNC(region, 1, uint8_t)
 978 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 1, uint8_t)
 979
 980 ASAN_BUS_WRITE_FUNC(, 2, uint16_t)
 981 ASAN_BUS_WRITE_FUNC(_stream, 2, uint16_t)
 982 ASAN_BUS_WRITE_PTR_FUNC(multi, 2, uint16_t)
 983 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 2, uint16_t)
 984 ASAN_BUS_WRITE_PTR_FUNC(region, 2, uint16_t)
 985 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 2, uint16_t)
 986
 987 ASAN_BUS_WRITE_FUNC(, 4, uint32_t)
 988 ASAN_BUS_WRITE_FUNC(_stream, 4, uint32_t)
 989 ASAN_BUS_WRITE_PTR_FUNC(multi, 4, uint32_t)
 990 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 4, uint32_t)
 991 ASAN_BUS_WRITE_PTR_FUNC(region, 4, uint32_t)
 992 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 4, uint32_t)
 993
 994 ASAN_BUS_WRITE_FUNC(, 8, uint64_t)
 995
 996 #define ASAN_BUS_SET_FUNC(func, width, type)                            \
 997         void kasan_bus_space_set_##func##_##width(bus_space_tag_t tag,  \
 998             bus_space_handle_t hnd, bus_size_t offset, type value,      \
 999             bus_size_t count)                                           \
1000         {                                                               \
1001                 bus_space_set_##func##_##width(tag, hnd, offset, value, \
1002                     count);                                             \
1003         }
1004
1005 ASAN_BUS_SET_FUNC(multi, 1, uint8_t)
1006 ASAN_BUS_SET_FUNC(region, 1, uint8_t)
1007 ASAN_BUS_SET_FUNC(multi_stream, 1, uint8_t)
1008 ASAN_BUS_SET_FUNC(region_stream, 1, uint8_t)
1009
1010 ASAN_BUS_SET_FUNC(multi, 2, uint16_t)
1011 ASAN_BUS_SET_FUNC(region, 2, uint16_t)
1012 ASAN_BUS_SET_FUNC(multi_stream, 2, uint16_t)
1013 ASAN_BUS_SET_FUNC(region_stream, 2, uint16_t)
1014
1015 ASAN_BUS_SET_FUNC(multi, 4, uint32_t)
1016 ASAN_BUS_SET_FUNC(region, 4, uint32_t)
1017 ASAN_BUS_SET_FUNC(multi_stream, 4, uint32_t)
1018 ASAN_BUS_SET_FUNC(region_stream, 4, uint32_t)
1019
1020 /* -------------------------------------------------------------------------- */
1021
1022 void __asan_register_globals(struct __asan_global *, size_t);
1023 void __asan_unregister_globals(struct __asan_global *, size_t);
1024
1025 void
1026 __asan_register_globals(struct __asan_global *globals, size_t n)
1027 {
1028         size_t i;
1029
1030         for (i = 0; i < n; i++) {
1031                 kasan_mark(globals[i].beg, globals[i].size,
1032                     globals[i].size_with_redzone, KASAN_GENERIC_REDZONE);
1033         }
1034 }
1035
1036 void
1037 __asan_unregister_globals(struct __asan_global *globals, size_t n)
1038 {
1039         size_t i;
1040
1041         for (i = 0; i < n; i++) {
1042                 kasan_mark(globals[i].beg, globals[i].size_with_redzone,
1043                     globals[i].size_with_redzone, 0);
1044         }
1045 }
1046
1047 #define ASAN_LOAD_STORE(size)                                   \
1048         void __asan_load##size(unsigned long);                  \
1049         void __asan_load##size(unsigned long addr)              \
1050         {                                                       \
1051                 kasan_shadow_check(addr, size, false, __RET_ADDR);\
1052         }                                                       \
1053         void __asan_load##size##_noabort(unsigned long);        \
1054         void __asan_load##size##_noabort(unsigned long addr)    \
1055         {                                                       \
1056                 kasan_shadow_check(addr, size, false, __RET_ADDR);\
1057         }                                                       \
1058         void __asan_store##size(unsigned long);                 \
1059         void __asan_store##size(unsigned long addr)             \
1060         {                                                       \
1061                 kasan_shadow_check(addr, size, true, __RET_ADDR);\
1062         }                                                       \
1063         void __asan_store##size##_noabort(unsigned long);       \
1064         void __asan_store##size##_noabort(unsigned long addr)   \
1065         {                                                       \
1066                 kasan_shadow_check(addr, size, true, __RET_ADDR);\
1067         }
1068
1069 ASAN_LOAD_STORE(1);
1070 ASAN_LOAD_STORE(2);
1071 ASAN_LOAD_STORE(4);
1072 ASAN_LOAD_STORE(8);
1073 ASAN_LOAD_STORE(16);
1074
1075 void __asan_loadN(unsigned long, size_t);
1076 void __asan_loadN_noabort(unsigned long, size_t);
1077 void __asan_storeN(unsigned long, size_t);
1078 void __asan_storeN_noabort(unsigned long, size_t);
1079 void __asan_handle_no_return(void);
1080
1081 void
1082 __asan_loadN(unsigned long addr, size_t size)
1083 {
1084         kasan_shadow_check(addr, size, false, __RET_ADDR);
1085 }
1086
1087 void
1088 __asan_loadN_noabort(unsigned long addr, size_t size)
1089 {
1090         kasan_shadow_check(addr, size, false, __RET_ADDR);
1091 }
1092
1093 void
1094 __asan_storeN(unsigned long addr, size_t size)
1095 {
1096         kasan_shadow_check(addr, size, true, __RET_ADDR);
1097 }
1098
1099 void
1100 __asan_storeN_noabort(unsigned long addr, size_t size)
1101 {
1102         kasan_shadow_check(addr, size, true, __RET_ADDR);
1103 }
1104
1105 void
1106 __asan_handle_no_return(void)
1107 {
1108         /* nothing */
1109 }
1110
1111 #define ASAN_SET_SHADOW(byte) \
1112         void __asan_set_shadow_##byte(void *, size_t);                  \
1113         void __asan_set_shadow_##byte(void *addr, size_t size)          \
1114         {                                                               \
1115                 __builtin_memset((void *)addr, 0x##byte, size);         \
1116         }
1117
1118 ASAN_SET_SHADOW(00);
1119 ASAN_SET_SHADOW(f1);
1120 ASAN_SET_SHADOW(f2);
1121 ASAN_SET_SHADOW(f3);
1122 ASAN_SET_SHADOW(f5);
1123 ASAN_SET_SHADOW(f8);
1124
1125 void __asan_poison_stack_memory(const void *, size_t);
1126 void __asan_unpoison_stack_memory(const void *, size_t);
1127
1128 void
1129 __asan_poison_stack_memory(const void *addr, size_t size)
1130 {
1131         size = roundup(size, KASAN_SHADOW_SCALE);
1132         kasan_shadow_Nbyte_fill(addr, size, KASAN_USE_AFTER_SCOPE);
1133 }
1134
1135 void
1136 __asan_unpoison_stack_memory(const void *addr, size_t size)
1137 {
1138         kasan_shadow_Nbyte_markvalid(addr, size);
1139 }
1140
1141 void __asan_alloca_poison(const void *, size_t);
1142 void __asan_allocas_unpoison(const void *, const void *);
1143
1144 void
1145 __asan_alloca_poison(const void *addr, size_t size)
1146 {
1147         const void *l, *r;
1148
1149         KASSERT((vm_offset_t)addr % KASAN_ALLOCA_SCALE_SIZE == 0,
1150             ("%s: invalid address %p", __func__, addr));
1151
1152         l = (const uint8_t *)addr - KASAN_ALLOCA_SCALE_SIZE;
1153         r = (const uint8_t *)addr + roundup(size, KASAN_ALLOCA_SCALE_SIZE);
1154
1155         kasan_shadow_Nbyte_fill(l, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_LEFT);
1156         kasan_mark(addr, size, roundup(size, KASAN_ALLOCA_SCALE_SIZE),
1157             KASAN_STACK_MID);
1158         kasan_shadow_Nbyte_fill(r, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_RIGHT);
1159 }
1160
1161 void
1162 __asan_allocas_unpoison(const void *stkbegin, const void *stkend)
1163 {
1164         size_t size;
1165
1166         if (__predict_false(!stkbegin))
1167                 return;
1168         if (__predict_false((uintptr_t)stkbegin > (uintptr_t)stkend))
1169                 return;
1170         size = (uintptr_t)stkend - (uintptr_t)stkbegin;
1171
1172         kasan_shadow_Nbyte_fill(stkbegin, size, 0);
1173 }
1174
1175 void __asan_poison_memory_region(const void *addr, size_t size);
1176 void __asan_unpoison_memory_region(const void *addr, size_t size);
1177
1178 void
1179 __asan_poison_memory_region(const void *addr, size_t size)
1180 {
1181 }
1182
1183 void
1184 __asan_unpoison_memory_region(const void *addr, size_t size)
1185 {
1186 }