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_kasan_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 static inline const char *
 143 kasan_code_name(uint8_t code)
 144 {
 145         switch (code) {
 146         case KASAN_GENERIC_REDZONE:
 147                 return "GenericRedZone";
 148         case KASAN_MALLOC_REDZONE:
 149                 return "MallocRedZone";
 150         case KASAN_KMEM_REDZONE:
 151                 return "KmemRedZone";
 152         case KASAN_UMA_FREED:
 153                 return "UMAUseAfterFree";
 154         case KASAN_KSTACK_FREED:
 155                 return "KernelStack";
 156         case KASAN_EXEC_ARGS_FREED:
 157                 return "ExecKVA";
 158         case 1 ... 7:
 159                 return "RedZonePartial";
 160         case KASAN_STACK_LEFT:
 161                 return "StackLeft";
 162         case KASAN_STACK_MID:
 163                 return "StackMiddle";
 164         case KASAN_STACK_RIGHT:
 165                 return "StackRight";
 166         case KASAN_USE_AFTER_RET:
 167                 return "UseAfterRet";
 168         case KASAN_USE_AFTER_SCOPE:
 169                 return "UseAfterScope";
 170         default:
 171                 return "Unknown";
 172         }
 173 }
 174
 175 #define REPORT(f, ...) do {                             \
 176         if (panic_on_violation) {                       \
 177                 kasan_enabled = false;                  \
 178                 panic(f, __VA_ARGS__);                  \
 179         } else {                                        \
 180                 struct stack st;                        \
 181                                                         \
 182                 stack_save(&st);                        \
 183                 printf(f "\n", __VA_ARGS__);            \
 184                 stack_print_ddb(&st);                   \
 185         }                                               \
 186 } while (0)
 187
 188 static void
 189 kasan_report(unsigned long addr, size_t size, bool write, unsigned long pc,
 190     uint8_t code)
 191 {
 192         REPORT("ASan: Invalid access, %zu-byte %s at %#lx, %s(%x)",
 193             size, (write ? "write" : "read"), addr, kasan_code_name(code),
 194             code);
 195 }
 196
 197 static __always_inline void
 198 kasan_shadow_1byte_markvalid(unsigned long addr)
 199 {
 200         int8_t *byte = (int8_t *)kasan_md_addr_to_shad(addr);
 201         int8_t last = (addr & KASAN_SHADOW_MASK) + 1;
 202
 203         *byte = last;
 204 }
 205
 206 static __always_inline void
 207 kasan_shadow_Nbyte_markvalid(const void *addr, size_t size)
 208 {
 209         size_t i;
 210
 211         for (i = 0; i < size; i++) {
 212                 kasan_shadow_1byte_markvalid((unsigned long)addr + i);
 213         }
 214 }
 215
 216 static __always_inline void
 217 kasan_shadow_Nbyte_fill(const void *addr, size_t size, uint8_t code)
 218 {
 219         void *shad;
 220
 221         if (__predict_false(size == 0))
 222                 return;
 223         if (__predict_false(kasan_md_unsupported((vm_offset_t)addr)))
 224                 return;
 225
 226         KASSERT((vm_offset_t)addr % KASAN_SHADOW_SCALE == 0,
 227             ("%s: invalid address %p", __func__, addr));
 228         KASSERT(size % KASAN_SHADOW_SCALE == 0,
 229             ("%s: invalid size %zu", __func__, size));
 230
 231         shad = (void *)kasan_md_addr_to_shad((uintptr_t)addr);
 232         size = size >> KASAN_SHADOW_SCALE_SHIFT;
 233
 234         __builtin_memset(shad, code, size);
 235 }
 236
 237 /*
 238  * In an area of size 'sz_with_redz', mark the 'size' first bytes as valid,
 239  * and the rest as invalid. There are generally two use cases:
 240  *
 241  *  o kasan_mark(addr, origsize, size, code), with origsize < size. This marks
 242  *    the redzone at the end of the buffer as invalid. If the entire is to be
 243  *    marked invalid, origsize will be 0.
 244  *
 245  *  o kasan_mark(addr, size, size, 0). This marks the entire buffer as valid.
 246  */
 247 void
 248 kasan_mark(const void *addr, size_t size, size_t redzsize, uint8_t code)
 249 {
 250         size_t i, n, redz;
 251         int8_t *shad;
 252
 253         if ((vm_offset_t)addr >= DMAP_MIN_ADDRESS &&
 254             (vm_offset_t)addr < DMAP_MAX_ADDRESS)
 255                 return;
 256
 257         KASSERT((vm_offset_t)addr >= VM_MIN_KERNEL_ADDRESS &&
 258             (vm_offset_t)addr < VM_MAX_KERNEL_ADDRESS,
 259             ("%s: invalid address %p", __func__, addr));
 260         KASSERT((vm_offset_t)addr % KASAN_SHADOW_SCALE == 0,
 261             ("%s: invalid address %p", __func__, addr));
 262         redz = redzsize - roundup(size, KASAN_SHADOW_SCALE);
 263         KASSERT(redz % KASAN_SHADOW_SCALE == 0,
 264             ("%s: invalid size %zu", __func__, redz));
 265         shad = (int8_t *)kasan_md_addr_to_shad((uintptr_t)addr);
 266
 267         /* Chunks of 8 bytes, valid. */
 268         n = size / KASAN_SHADOW_SCALE;
 269         for (i = 0; i < n; i++) {
 270                 *shad++ = 0;
 271         }
 272
 273         /* Possibly one chunk, mid. */
 274         if ((size & KASAN_SHADOW_MASK) != 0) {
 275                 *shad++ = (size & KASAN_SHADOW_MASK);
 276         }
 277
 278         /* Chunks of 8 bytes, invalid. */
 279         n = redz / KASAN_SHADOW_SCALE;
 280         for (i = 0; i < n; i++) {
 281                 *shad++ = code;
 282         }
 283 }
 284
 285 /* -------------------------------------------------------------------------- */
 286
 287 #define ADDR_CROSSES_SCALE_BOUNDARY(addr, size)                 \
 288         (addr >> KASAN_SHADOW_SCALE_SHIFT) !=                   \
 289             ((addr + size - 1) >> KASAN_SHADOW_SCALE_SHIFT)
 290
 291 static __always_inline bool
 292 kasan_shadow_1byte_isvalid(unsigned long addr, uint8_t *code)
 293 {
 294         int8_t *byte = (int8_t *)kasan_md_addr_to_shad(addr);
 295         int8_t last = (addr & KASAN_SHADOW_MASK) + 1;
 296
 297         if (__predict_true(*byte == 0 || last <= *byte)) {
 298                 return (true);
 299         }
 300         *code = *byte;
 301         return (false);
 302 }
 303
 304 static __always_inline bool
 305 kasan_shadow_2byte_isvalid(unsigned long addr, uint8_t *code)
 306 {
 307         int8_t *byte, last;
 308
 309         if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 2)) {
 310                 return (kasan_shadow_1byte_isvalid(addr, code) &&
 311                     kasan_shadow_1byte_isvalid(addr+1, code));
 312         }
 313
 314         byte = (int8_t *)kasan_md_addr_to_shad(addr);
 315         last = ((addr + 1) & KASAN_SHADOW_MASK) + 1;
 316
 317         if (__predict_true(*byte == 0 || last <= *byte)) {
 318                 return (true);
 319         }
 320         *code = *byte;
 321         return (false);
 322 }
 323
 324 static __always_inline bool
 325 kasan_shadow_4byte_isvalid(unsigned long addr, uint8_t *code)
 326 {
 327         int8_t *byte, last;
 328
 329         if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 4)) {
 330                 return (kasan_shadow_2byte_isvalid(addr, code) &&
 331                     kasan_shadow_2byte_isvalid(addr+2, code));
 332         }
 333
 334         byte = (int8_t *)kasan_md_addr_to_shad(addr);
 335         last = ((addr + 3) & KASAN_SHADOW_MASK) + 1;
 336
 337         if (__predict_true(*byte == 0 || last <= *byte)) {
 338                 return (true);
 339         }
 340         *code = *byte;
 341         return (false);
 342 }
 343
 344 static __always_inline bool
 345 kasan_shadow_8byte_isvalid(unsigned long addr, uint8_t *code)
 346 {
 347         int8_t *byte, last;
 348
 349         if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 8)) {
 350                 return (kasan_shadow_4byte_isvalid(addr, code) &&
 351                     kasan_shadow_4byte_isvalid(addr+4, code));
 352         }
 353
 354         byte = (int8_t *)kasan_md_addr_to_shad(addr);
 355         last = ((addr + 7) & KASAN_SHADOW_MASK) + 1;
 356
 357         if (__predict_true(*byte == 0 || last <= *byte)) {
 358                 return (true);
 359         }
 360         *code = *byte;
 361         return (false);
 362 }
 363
 364 static __always_inline bool
 365 kasan_shadow_Nbyte_isvalid(unsigned long addr, size_t size, uint8_t *code)
 366 {
 367         size_t i;
 368
 369         for (i = 0; i < size; i++) {
 370                 if (!kasan_shadow_1byte_isvalid(addr+i, code))
 371                         return (false);
 372         }
 373
 374         return (true);
 375 }
 376
 377 static __always_inline void
 378 kasan_shadow_check(unsigned long addr, size_t size, bool write,
 379     unsigned long retaddr)
 380 {
 381         uint8_t code;
 382         bool valid;
 383
 384         if (__predict_false(!kasan_enabled))
 385                 return;
 386         if (__predict_false(size == 0))
 387                 return;
 388         if (__predict_false(kasan_md_unsupported(addr)))
 389                 return;
 390         if (__predict_false(panicstr != NULL))
 391                 return;
 392
 393         if (__builtin_constant_p(size)) {
 394                 switch (size) {
 395                 case 1:
 396                         valid = kasan_shadow_1byte_isvalid(addr, &code);
 397                         break;
 398                 case 2:
 399                         valid = kasan_shadow_2byte_isvalid(addr, &code);
 400                         break;
 401                 case 4:
 402                         valid = kasan_shadow_4byte_isvalid(addr, &code);
 403                         break;
 404                 case 8:
 405                         valid = kasan_shadow_8byte_isvalid(addr, &code);
 406                         break;
 407                 default:
 408                         valid = kasan_shadow_Nbyte_isvalid(addr, size, &code);
 409                         break;
 410                 }
 411         } else {
 412                 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code);
 413         }
 414
 415         if (__predict_false(!valid)) {
 416                 kasan_report(addr, size, write, retaddr, code);
 417         }
 418 }
 419
 420 /* -------------------------------------------------------------------------- */
 421
 422 void *
 423 kasan_memcpy(void *dst, const void *src, size_t len)
 424 {
 425         kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR);
 426         kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR);
 427         return (__builtin_memcpy(dst, src, len));
 428 }
 429
 430 int
 431 kasan_memcmp(const void *b1, const void *b2, size_t len)
 432 {
 433         kasan_shadow_check((unsigned long)b1, len, false, __RET_ADDR);
 434         kasan_shadow_check((unsigned long)b2, len, false, __RET_ADDR);
 435         return (__builtin_memcmp(b1, b2, len));
 436 }
 437
 438 void *
 439 kasan_memset(void *b, int c, size_t len)
 440 {
 441         kasan_shadow_check((unsigned long)b, len, true, __RET_ADDR);
 442         return (__builtin_memset(b, c, len));
 443 }
 444
 445 void *
 446 kasan_memmove(void *dst, const void *src, size_t len)
 447 {
 448         kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR);
 449         kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR);
 450         return (__builtin_memmove(dst, src, len));
 451 }
 452
 453 size_t
 454 kasan_strlen(const char *str)
 455 {
 456         const char *s;
 457
 458         s = str;
 459         while (1) {
 460                 kasan_shadow_check((unsigned long)s, 1, false, __RET_ADDR);
 461                 if (*s == '\0')
 462                         break;
 463                 s++;
 464         }
 465
 466         return (s - str);
 467 }
 468
 469 char *
 470 kasan_strcpy(char *dst, const char *src)
 471 {
 472         char *save = dst;
 473
 474         while (1) {
 475                 kasan_shadow_check((unsigned long)src, 1, false, __RET_ADDR);
 476                 kasan_shadow_check((unsigned long)dst, 1, true, __RET_ADDR);
 477                 *dst = *src;
 478                 if (*src == '\0')
 479                         break;
 480                 src++, dst++;
 481         }
 482
 483         return save;
 484 }
 485
 486 int
 487 kasan_strcmp(const char *s1, const char *s2)
 488 {
 489         while (1) {
 490                 kasan_shadow_check((unsigned long)s1, 1, false, __RET_ADDR);
 491                 kasan_shadow_check((unsigned long)s2, 1, false, __RET_ADDR);
 492                 if (*s1 != *s2)
 493                         break;
 494                 if (*s1 == '\0')
 495                         return 0;
 496                 s1++, s2++;
 497         }
 498
 499         return (*(const unsigned char *)s1 - *(const unsigned char *)s2);
 500 }
 501
 502 int
 503 kasan_copyin(const void *uaddr, void *kaddr, size_t len)
 504 {
 505         kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR);
 506         return (copyin(uaddr, kaddr, len));
 507 }
 508
 509 int
 510 kasan_copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done)
 511 {
 512         kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR);
 513         return (copyinstr(uaddr, kaddr, len, done));
 514 }
 515
 516 int
 517 kasan_copyout(const void *kaddr, void *uaddr, size_t len)
 518 {
 519         kasan_shadow_check((unsigned long)kaddr, len, false, __RET_ADDR);
 520         return (copyout(kaddr, uaddr, len));
 521 }
 522
 523 /* -------------------------------------------------------------------------- */
 524
 525 #include <machine/atomic.h>
 526 #define ATOMIC_SAN_PREFIX       kasan
 527 #include <sys/atomic_san.h>
 528
 529 #define _ASAN_ATOMIC_FUNC_ADD(name, type)                               \
 530         void kasan_atomic_add_##name(volatile type *ptr, type val)      \
 531         {                                                               \
 532                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 533                     __RET_ADDR);                                        \
 534                 atomic_add_##name(ptr, val);                            \
 535         }
 536
 537 #define ASAN_ATOMIC_FUNC_ADD(name, type)                                \
 538         _ASAN_ATOMIC_FUNC_ADD(name, type)                               \
 539         _ASAN_ATOMIC_FUNC_ADD(acq_##name, type)                         \
 540         _ASAN_ATOMIC_FUNC_ADD(rel_##name, type)
 541
 542 #define _ASAN_ATOMIC_FUNC_SUBTRACT(name, type)                          \
 543         void kasan_atomic_subtract_##name(volatile type *ptr, type val) \
 544         {                                                               \
 545                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 546                     __RET_ADDR);                                        \
 547                 atomic_subtract_##name(ptr, val);                       \
 548         }
 549
 550 #define ASAN_ATOMIC_FUNC_SUBTRACT(name, type)                           \
 551         _ASAN_ATOMIC_FUNC_SUBTRACT(name, type)                          \
 552         _ASAN_ATOMIC_FUNC_SUBTRACT(acq_##name, type)                    \
 553         _ASAN_ATOMIC_FUNC_SUBTRACT(rel_##name, type)
 554
 555 #define _ASAN_ATOMIC_FUNC_SET(name, type)                               \
 556         void kasan_atomic_set_##name(volatile type *ptr, type val)      \
 557         {                                                               \
 558                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 559                     __RET_ADDR);                                        \
 560                 atomic_set_##name(ptr, val);                            \
 561         }
 562
 563 #define ASAN_ATOMIC_FUNC_SET(name, type)                                \
 564         _ASAN_ATOMIC_FUNC_SET(name, type)                               \
 565         _ASAN_ATOMIC_FUNC_SET(acq_##name, type)                         \
 566         _ASAN_ATOMIC_FUNC_SET(rel_##name, type)
 567
 568 #define _ASAN_ATOMIC_FUNC_CLEAR(name, type)                             \
 569         void kasan_atomic_clear_##name(volatile type *ptr, type val)    \
 570         {                                                               \
 571                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 572                     __RET_ADDR);                                        \
 573                 atomic_clear_##name(ptr, val);                          \
 574         }
 575
 576 #define ASAN_ATOMIC_FUNC_CLEAR(name, type)                              \
 577         _ASAN_ATOMIC_FUNC_CLEAR(name, type)                             \
 578         _ASAN_ATOMIC_FUNC_CLEAR(acq_##name, type)                       \
 579         _ASAN_ATOMIC_FUNC_CLEAR(rel_##name, type)
 580
 581 #define ASAN_ATOMIC_FUNC_FETCHADD(name, type)                           \
 582         type kasan_atomic_fetchadd_##name(volatile type *ptr, type val) \
 583         {                                                               \
 584                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 585                     __RET_ADDR);                                        \
 586                 return (atomic_fetchadd_##name(ptr, val));              \
 587         }
 588
 589 #define ASAN_ATOMIC_FUNC_READANDCLEAR(name, type)                       \
 590         type kasan_atomic_readandclear_##name(volatile type *ptr)       \
 591         {                                                               \
 592                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 593                     __RET_ADDR);                                        \
 594                 return (atomic_readandclear_##name(ptr));               \
 595         }
 596
 597 #define ASAN_ATOMIC_FUNC_TESTANDCLEAR(name, type)                       \
 598         int kasan_atomic_testandclear_##name(volatile type *ptr, u_int v) \
 599         {                                                               \
 600                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 601                     __RET_ADDR);                                        \
 602                 return (atomic_testandclear_##name(ptr, v));            \
 603         }
 604
 605 #define ASAN_ATOMIC_FUNC_TESTANDSET(name, type)                         \
 606         int kasan_atomic_testandset_##name(volatile type *ptr, u_int v) \
 607         {                                                               \
 608                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 609                     __RET_ADDR);                                        \
 610                 return (atomic_testandset_##name(ptr, v));              \
 611         }
 612
 613 #define ASAN_ATOMIC_FUNC_SWAP(name, type)                               \
 614         type kasan_atomic_swap_##name(volatile type *ptr, type val)     \
 615         {                                                               \
 616                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 617                     __RET_ADDR);                                        \
 618                 return (atomic_swap_##name(ptr, val));                  \
 619         }
 620
 621 #define _ASAN_ATOMIC_FUNC_CMPSET(name, type)                            \
 622         int kasan_atomic_cmpset_##name(volatile type *ptr, type oval,   \
 623             type nval)                                                  \
 624         {                                                               \
 625                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 626                     __RET_ADDR);                                        \
 627                 return (atomic_cmpset_##name(ptr, oval, nval));         \
 628         }
 629
 630 #define ASAN_ATOMIC_FUNC_CMPSET(name, type)                             \
 631         _ASAN_ATOMIC_FUNC_CMPSET(name, type)                            \
 632         _ASAN_ATOMIC_FUNC_CMPSET(acq_##name, type)                      \
 633         _ASAN_ATOMIC_FUNC_CMPSET(rel_##name, type)
 634
 635 #define _ASAN_ATOMIC_FUNC_FCMPSET(name, type)                           \
 636         int kasan_atomic_fcmpset_##name(volatile type *ptr, type *oval, \
 637             type nval)                                                  \
 638         {                                                               \
 639                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 640                     __RET_ADDR);                                        \
 641                 return (atomic_fcmpset_##name(ptr, oval, nval));        \
 642         }
 643
 644 #define ASAN_ATOMIC_FUNC_FCMPSET(name, type)                            \
 645         _ASAN_ATOMIC_FUNC_FCMPSET(name, type)                           \
 646         _ASAN_ATOMIC_FUNC_FCMPSET(acq_##name, type)                     \
 647         _ASAN_ATOMIC_FUNC_FCMPSET(rel_##name, type)
 648
 649 #define ASAN_ATOMIC_FUNC_THREAD_FENCE(name)                             \
 650         void kasan_atomic_thread_fence_##name(void)                     \
 651         {                                                               \
 652                 atomic_thread_fence_##name();                           \
 653         }
 654
 655 #define _ASAN_ATOMIC_FUNC_LOAD(name, type)                              \
 656         type kasan_atomic_load_##name(volatile type *ptr)               \
 657         {                                                               \
 658                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 659                     __RET_ADDR);                                        \
 660                 return (atomic_load_##name(ptr));                       \
 661         }
 662
 663 #define ASAN_ATOMIC_FUNC_LOAD(name, type)                               \
 664         _ASAN_ATOMIC_FUNC_LOAD(name, type)                              \
 665         _ASAN_ATOMIC_FUNC_LOAD(acq_##name, type)
 666
 667 #define _ASAN_ATOMIC_FUNC_STORE(name, type)                             \
 668         void kasan_atomic_store_##name(volatile type *ptr, type val)    \
 669         {                                                               \
 670                 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true,  \
 671                     __RET_ADDR);                                        \
 672                 atomic_store_##name(ptr, val);                          \
 673         }
 674
 675 #define ASAN_ATOMIC_FUNC_STORE(name, type)                              \
 676         _ASAN_ATOMIC_FUNC_STORE(name, type)                             \
 677         _ASAN_ATOMIC_FUNC_STORE(rel_##name, type)
 678
 679 ASAN_ATOMIC_FUNC_ADD(8, uint8_t);
 680 ASAN_ATOMIC_FUNC_ADD(16, uint16_t);
 681 ASAN_ATOMIC_FUNC_ADD(32, uint32_t);
 682 ASAN_ATOMIC_FUNC_ADD(64, uint64_t);
 683 ASAN_ATOMIC_FUNC_ADD(int, u_int);
 684 ASAN_ATOMIC_FUNC_ADD(long, u_long);
 685 ASAN_ATOMIC_FUNC_ADD(ptr, uintptr_t);
 686
 687 ASAN_ATOMIC_FUNC_SUBTRACT(8, uint8_t);
 688 ASAN_ATOMIC_FUNC_SUBTRACT(16, uint16_t);
 689 ASAN_ATOMIC_FUNC_SUBTRACT(32, uint32_t);
 690 ASAN_ATOMIC_FUNC_SUBTRACT(64, uint64_t);
 691 ASAN_ATOMIC_FUNC_SUBTRACT(int, u_int);
 692 ASAN_ATOMIC_FUNC_SUBTRACT(long, u_long);
 693 ASAN_ATOMIC_FUNC_SUBTRACT(ptr, uintptr_t);
 694
 695 ASAN_ATOMIC_FUNC_SET(8, uint8_t);
 696 ASAN_ATOMIC_FUNC_SET(16, uint16_t);
 697 ASAN_ATOMIC_FUNC_SET(32, uint32_t);
 698 ASAN_ATOMIC_FUNC_SET(64, uint64_t);
 699 ASAN_ATOMIC_FUNC_SET(int, u_int);
 700 ASAN_ATOMIC_FUNC_SET(long, u_long);
 701 ASAN_ATOMIC_FUNC_SET(ptr, uintptr_t);
 702
 703 ASAN_ATOMIC_FUNC_CLEAR(8, uint8_t);
 704 ASAN_ATOMIC_FUNC_CLEAR(16, uint16_t);
 705 ASAN_ATOMIC_FUNC_CLEAR(32, uint32_t);
 706 ASAN_ATOMIC_FUNC_CLEAR(64, uint64_t);
 707 ASAN_ATOMIC_FUNC_CLEAR(int, u_int);
 708 ASAN_ATOMIC_FUNC_CLEAR(long, u_long);
 709 ASAN_ATOMIC_FUNC_CLEAR(ptr, uintptr_t);
 710
 711 ASAN_ATOMIC_FUNC_FETCHADD(32, uint32_t);
 712 ASAN_ATOMIC_FUNC_FETCHADD(64, uint64_t);
 713 ASAN_ATOMIC_FUNC_FETCHADD(int, u_int);
 714 ASAN_ATOMIC_FUNC_FETCHADD(long, u_long);
 715
 716 ASAN_ATOMIC_FUNC_READANDCLEAR(32, uint32_t);
 717 ASAN_ATOMIC_FUNC_READANDCLEAR(64, uint64_t);
 718 ASAN_ATOMIC_FUNC_READANDCLEAR(int, u_int);
 719 ASAN_ATOMIC_FUNC_READANDCLEAR(long, u_long);
 720 ASAN_ATOMIC_FUNC_READANDCLEAR(ptr, uintptr_t);
 721
 722 ASAN_ATOMIC_FUNC_TESTANDCLEAR(32, uint32_t);
 723 ASAN_ATOMIC_FUNC_TESTANDCLEAR(64, uint64_t);
 724 ASAN_ATOMIC_FUNC_TESTANDCLEAR(int, u_int);
 725 ASAN_ATOMIC_FUNC_TESTANDCLEAR(long, u_long);
 726
 727 ASAN_ATOMIC_FUNC_TESTANDSET(32, uint32_t);
 728 ASAN_ATOMIC_FUNC_TESTANDSET(64, uint64_t);
 729 ASAN_ATOMIC_FUNC_TESTANDSET(int, u_int);
 730 ASAN_ATOMIC_FUNC_TESTANDSET(long, u_long);
 731
 732 ASAN_ATOMIC_FUNC_SWAP(32, uint32_t);
 733 ASAN_ATOMIC_FUNC_SWAP(64, uint64_t);
 734 ASAN_ATOMIC_FUNC_SWAP(int, u_int);
 735 ASAN_ATOMIC_FUNC_SWAP(long, u_long);
 736 ASAN_ATOMIC_FUNC_SWAP(ptr, uintptr_t);
 737
 738 ASAN_ATOMIC_FUNC_CMPSET(8, uint8_t);
 739 ASAN_ATOMIC_FUNC_CMPSET(16, uint16_t);
 740 ASAN_ATOMIC_FUNC_CMPSET(32, uint32_t);
 741 ASAN_ATOMIC_FUNC_CMPSET(64, uint64_t);
 742 ASAN_ATOMIC_FUNC_CMPSET(int, u_int);
 743 ASAN_ATOMIC_FUNC_CMPSET(long, u_long);
 744 ASAN_ATOMIC_FUNC_CMPSET(ptr, uintptr_t);
 745
 746 ASAN_ATOMIC_FUNC_FCMPSET(8, uint8_t);
 747 ASAN_ATOMIC_FUNC_FCMPSET(16, uint16_t);
 748 ASAN_ATOMIC_FUNC_FCMPSET(32, uint32_t);
 749 ASAN_ATOMIC_FUNC_FCMPSET(64, uint64_t);
 750 ASAN_ATOMIC_FUNC_FCMPSET(int, u_int);
 751 ASAN_ATOMIC_FUNC_FCMPSET(long, u_long);
 752 ASAN_ATOMIC_FUNC_FCMPSET(ptr, uintptr_t);
 753
 754 ASAN_ATOMIC_FUNC_LOAD(8, uint8_t);
 755 ASAN_ATOMIC_FUNC_LOAD(16, uint16_t);
 756 ASAN_ATOMIC_FUNC_LOAD(32, uint32_t);
 757 ASAN_ATOMIC_FUNC_LOAD(64, uint64_t);
 758 ASAN_ATOMIC_FUNC_LOAD(char, u_char);
 759 ASAN_ATOMIC_FUNC_LOAD(short, u_short);
 760 ASAN_ATOMIC_FUNC_LOAD(int, u_int);
 761 ASAN_ATOMIC_FUNC_LOAD(long, u_long);
 762 ASAN_ATOMIC_FUNC_LOAD(ptr, uintptr_t);
 763
 764 ASAN_ATOMIC_FUNC_STORE(8, uint8_t);
 765 ASAN_ATOMIC_FUNC_STORE(16, uint16_t);
 766 ASAN_ATOMIC_FUNC_STORE(32, uint32_t);
 767 ASAN_ATOMIC_FUNC_STORE(64, uint64_t);
 768 ASAN_ATOMIC_FUNC_STORE(char, u_char);
 769 ASAN_ATOMIC_FUNC_STORE(short, u_short);
 770 ASAN_ATOMIC_FUNC_STORE(int, u_int);
 771 ASAN_ATOMIC_FUNC_STORE(long, u_long);
 772 ASAN_ATOMIC_FUNC_STORE(ptr, uintptr_t);
 773
 774 ASAN_ATOMIC_FUNC_THREAD_FENCE(acq);
 775 ASAN_ATOMIC_FUNC_THREAD_FENCE(rel);
 776 ASAN_ATOMIC_FUNC_THREAD_FENCE(acq_rel);
 777 ASAN_ATOMIC_FUNC_THREAD_FENCE(seq_cst);
 778
 779 void
 780 kasan_atomic_interrupt_fence(void)
 781 {
 782 }
 783
 784 /* -------------------------------------------------------------------------- */
 785
 786 #include <sys/bus.h>
 787 #include <machine/bus.h>
 788 #define BUS_SAN_PREFIX  kasan
 789 #include <sys/bus_san.h>
 790
 791 int
 792 kasan_bus_space_map(bus_space_tag_t tag, bus_addr_t hnd, bus_size_t size,
 793     int flags, bus_space_handle_t *handlep)
 794 {
 795         return (bus_space_map(tag, hnd, size, flags, handlep));
 796 }
 797
 798 void
 799 kasan_bus_space_unmap(bus_space_tag_t tag, bus_space_handle_t hnd,
 800     bus_size_t size)
 801 {
 802         bus_space_unmap(tag, hnd, size);
 803 }
 804
 805 int
 806 kasan_bus_space_subregion(bus_space_tag_t tag, bus_space_handle_t hnd,
 807     bus_size_t offset, bus_size_t size, bus_space_handle_t *handlep)
 808 {
 809         return (bus_space_subregion(tag, hnd, offset, size, handlep));
 810 }
 811
 812 void
 813 kasan_bus_space_free(bus_space_tag_t tag, bus_space_handle_t hnd,
 814     bus_size_t size)
 815 {
 816         bus_space_free(tag, hnd, size);
 817 }
 818
 819 void
 820 kasan_bus_space_barrier(bus_space_tag_t tag, bus_space_handle_t hnd,
 821     bus_size_t offset, bus_size_t size, int flags)
 822 {
 823         bus_space_barrier(tag, hnd, offset, size, flags);
 824 }
 825
 826 #define ASAN_BUS_READ_FUNC(func, width, type)                           \
 827         type kasan_bus_space_read##func##_##width(bus_space_tag_t tag,  \
 828             bus_space_handle_t hnd, bus_size_t offset)                  \
 829         {                                                               \
 830                 return (bus_space_read##func##_##width(tag, hnd,        \
 831                     offset));                                           \
 832         }                                                               \
 833
 834 #define ASAN_BUS_READ_PTR_FUNC(func, width, type)                       \
 835         void kasan_bus_space_read_##func##_##width(bus_space_tag_t tag, \
 836             bus_space_handle_t hnd, bus_size_t size, type *buf,         \
 837             bus_size_t count)                                           \
 838         {                                                               \
 839                 kasan_shadow_check((uintptr_t)buf, sizeof(type) * count,\
 840                     false, __RET_ADDR);                                 \
 841                 bus_space_read_##func##_##width(tag, hnd, size, buf,    \
 842                     count);                                             \
 843         }
 844
 845 ASAN_BUS_READ_FUNC(, 1, uint8_t)
 846 ASAN_BUS_READ_FUNC(_stream, 1, uint8_t)
 847 ASAN_BUS_READ_PTR_FUNC(multi, 1, uint8_t)
 848 ASAN_BUS_READ_PTR_FUNC(multi_stream, 1, uint8_t)
 849 ASAN_BUS_READ_PTR_FUNC(region, 1, uint8_t)
 850 ASAN_BUS_READ_PTR_FUNC(region_stream, 1, uint8_t)
 851
 852 ASAN_BUS_READ_FUNC(, 2, uint16_t)
 853 ASAN_BUS_READ_FUNC(_stream, 2, uint16_t)
 854 ASAN_BUS_READ_PTR_FUNC(multi, 2, uint16_t)
 855 ASAN_BUS_READ_PTR_FUNC(multi_stream, 2, uint16_t)
 856 ASAN_BUS_READ_PTR_FUNC(region, 2, uint16_t)
 857 ASAN_BUS_READ_PTR_FUNC(region_stream, 2, uint16_t)
 858
 859 ASAN_BUS_READ_FUNC(, 4, uint32_t)
 860 ASAN_BUS_READ_FUNC(_stream, 4, uint32_t)
 861 ASAN_BUS_READ_PTR_FUNC(multi, 4, uint32_t)
 862 ASAN_BUS_READ_PTR_FUNC(multi_stream, 4, uint32_t)
 863 ASAN_BUS_READ_PTR_FUNC(region, 4, uint32_t)
 864 ASAN_BUS_READ_PTR_FUNC(region_stream, 4, uint32_t)
 865
 866 ASAN_BUS_READ_FUNC(, 8, uint64_t)
 867
 868 #define ASAN_BUS_WRITE_FUNC(func, width, type)                          \
 869         void kasan_bus_space_write##func##_##width(bus_space_tag_t tag, \
 870             bus_space_handle_t hnd, bus_size_t offset, type value)      \
 871         {                                                               \
 872                 bus_space_write##func##_##width(tag, hnd, offset, value);\
 873         }                                                               \
 874
 875 #define ASAN_BUS_WRITE_PTR_FUNC(func, width, type)                      \
 876         void kasan_bus_space_write_##func##_##width(bus_space_tag_t tag,\
 877             bus_space_handle_t hnd, bus_size_t size, const type *buf,   \
 878             bus_size_t count)                                           \
 879         {                                                               \
 880                 kasan_shadow_check((uintptr_t)buf, sizeof(type) * count,\
 881                     true, __RET_ADDR);                                  \
 882                 bus_space_write_##func##_##width(tag, hnd, size, buf,   \
 883                     count);                                             \
 884         }
 885
 886 ASAN_BUS_WRITE_FUNC(, 1, uint8_t)
 887 ASAN_BUS_WRITE_FUNC(_stream, 1, uint8_t)
 888 ASAN_BUS_WRITE_PTR_FUNC(multi, 1, uint8_t)
 889 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 1, uint8_t)
 890 ASAN_BUS_WRITE_PTR_FUNC(region, 1, uint8_t)
 891 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 1, uint8_t)
 892
 893 ASAN_BUS_WRITE_FUNC(, 2, uint16_t)
 894 ASAN_BUS_WRITE_FUNC(_stream, 2, uint16_t)
 895 ASAN_BUS_WRITE_PTR_FUNC(multi, 2, uint16_t)
 896 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 2, uint16_t)
 897 ASAN_BUS_WRITE_PTR_FUNC(region, 2, uint16_t)
 898 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 2, uint16_t)
 899
 900 ASAN_BUS_WRITE_FUNC(, 4, uint32_t)
 901 ASAN_BUS_WRITE_FUNC(_stream, 4, uint32_t)
 902 ASAN_BUS_WRITE_PTR_FUNC(multi, 4, uint32_t)
 903 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 4, uint32_t)
 904 ASAN_BUS_WRITE_PTR_FUNC(region, 4, uint32_t)
 905 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 4, uint32_t)
 906
 907 ASAN_BUS_WRITE_FUNC(, 8, uint64_t)
 908
 909 #define ASAN_BUS_SET_FUNC(func, width, type)                            \
 910         void kasan_bus_space_set_##func##_##width(bus_space_tag_t tag,  \
 911             bus_space_handle_t hnd, bus_size_t offset, type value,      \
 912             bus_size_t count)                                           \
 913         {                                                               \
 914                 bus_space_set_##func##_##width(tag, hnd, offset, value, \
 915                     count);                                             \
 916         }
 917
 918 ASAN_BUS_SET_FUNC(multi, 1, uint8_t)
 919 ASAN_BUS_SET_FUNC(region, 1, uint8_t)
 920 ASAN_BUS_SET_FUNC(multi_stream, 1, uint8_t)
 921 ASAN_BUS_SET_FUNC(region_stream, 1, uint8_t)
 922
 923 ASAN_BUS_SET_FUNC(multi, 2, uint16_t)
 924 ASAN_BUS_SET_FUNC(region, 2, uint16_t)
 925 ASAN_BUS_SET_FUNC(multi_stream, 2, uint16_t)
 926 ASAN_BUS_SET_FUNC(region_stream, 2, uint16_t)
 927
 928 ASAN_BUS_SET_FUNC(multi, 4, uint32_t)
 929 ASAN_BUS_SET_FUNC(region, 4, uint32_t)
 930 ASAN_BUS_SET_FUNC(multi_stream, 4, uint32_t)
 931 ASAN_BUS_SET_FUNC(region_stream, 4, uint32_t)
 932
 933 /* -------------------------------------------------------------------------- */
 934
 935 void __asan_register_globals(struct __asan_global *, size_t);
 936 void __asan_unregister_globals(struct __asan_global *, size_t);
 937
 938 void
 939 __asan_register_globals(struct __asan_global *globals, size_t n)
 940 {
 941         size_t i;
 942
 943         for (i = 0; i < n; i++) {
 944                 kasan_mark(globals[i].beg, globals[i].size,
 945                     globals[i].size_with_redzone, KASAN_GENERIC_REDZONE);
 946         }
 947 }
 948
 949 void
 950 __asan_unregister_globals(struct __asan_global *globals, size_t n)
 951 {
 952         size_t i;
 953
 954         for (i = 0; i < n; i++) {
 955                 kasan_mark(globals[i].beg, globals[i].size_with_redzone,
 956                     globals[i].size_with_redzone, 0);
 957         }
 958 }
 959
 960 #define ASAN_LOAD_STORE(size)                                   \
 961         void __asan_load##size(unsigned long);                  \
 962         void __asan_load##size(unsigned long addr)              \
 963         {                                                       \
 964                 kasan_shadow_check(addr, size, false, __RET_ADDR);\
 965         }                                                       \
 966         void __asan_load##size##_noabort(unsigned long);        \
 967         void __asan_load##size##_noabort(unsigned long addr)    \
 968         {                                                       \
 969                 kasan_shadow_check(addr, size, false, __RET_ADDR);\
 970         }                                                       \
 971         void __asan_store##size(unsigned long);                 \
 972         void __asan_store##size(unsigned long addr)             \
 973         {                                                       \
 974                 kasan_shadow_check(addr, size, true, __RET_ADDR);\
 975         }                                                       \
 976         void __asan_store##size##_noabort(unsigned long);       \
 977         void __asan_store##size##_noabort(unsigned long addr)   \
 978         {                                                       \
 979                 kasan_shadow_check(addr, size, true, __RET_ADDR);\
 980         }
 981
 982 ASAN_LOAD_STORE(1);
 983 ASAN_LOAD_STORE(2);
 984 ASAN_LOAD_STORE(4);
 985 ASAN_LOAD_STORE(8);
 986 ASAN_LOAD_STORE(16);
 987
 988 void __asan_loadN(unsigned long, size_t);
 989 void __asan_loadN_noabort(unsigned long, size_t);
 990 void __asan_storeN(unsigned long, size_t);
 991 void __asan_storeN_noabort(unsigned long, size_t);
 992 void __asan_handle_no_return(void);
 993
 994 void
 995 __asan_loadN(unsigned long addr, size_t size)
 996 {
 997         kasan_shadow_check(addr, size, false, __RET_ADDR);
 998 }
 999
1000 void
1001 __asan_loadN_noabort(unsigned long addr, size_t size)
1002 {
1003         kasan_shadow_check(addr, size, false, __RET_ADDR);
1004 }
1005
1006 void
1007 __asan_storeN(unsigned long addr, size_t size)
1008 {
1009         kasan_shadow_check(addr, size, true, __RET_ADDR);
1010 }
1011
1012 void
1013 __asan_storeN_noabort(unsigned long addr, size_t size)
1014 {
1015         kasan_shadow_check(addr, size, true, __RET_ADDR);
1016 }
1017
1018 void
1019 __asan_handle_no_return(void)
1020 {
1021         /* nothing */
1022 }
1023
1024 #define ASAN_SET_SHADOW(byte) \
1025         void __asan_set_shadow_##byte(void *, size_t);                  \
1026         void __asan_set_shadow_##byte(void *addr, size_t size)          \
1027         {                                                               \
1028                 __builtin_memset((void *)addr, 0x##byte, size);         \
1029         }
1030
1031 ASAN_SET_SHADOW(00);
1032 ASAN_SET_SHADOW(f1);
1033 ASAN_SET_SHADOW(f2);
1034 ASAN_SET_SHADOW(f3);
1035 ASAN_SET_SHADOW(f5);
1036 ASAN_SET_SHADOW(f8);
1037
1038 void __asan_poison_stack_memory(const void *, size_t);
1039 void __asan_unpoison_stack_memory(const void *, size_t);
1040
1041 void
1042 __asan_poison_stack_memory(const void *addr, size_t size)
1043 {
1044         size = roundup(size, KASAN_SHADOW_SCALE);
1045         kasan_shadow_Nbyte_fill(addr, size, KASAN_USE_AFTER_SCOPE);
1046 }
1047
1048 void
1049 __asan_unpoison_stack_memory(const void *addr, size_t size)
1050 {
1051         kasan_shadow_Nbyte_markvalid(addr, size);
1052 }
1053
1054 void __asan_alloca_poison(const void *, size_t);
1055 void __asan_allocas_unpoison(const void *, const void *);
1056
1057 void
1058 __asan_alloca_poison(const void *addr, size_t size)
1059 {
1060         const void *l, *r;
1061
1062         KASSERT((vm_offset_t)addr % KASAN_ALLOCA_SCALE_SIZE == 0,
1063             ("%s: invalid address %p", __func__, addr));
1064
1065         l = (const uint8_t *)addr - KASAN_ALLOCA_SCALE_SIZE;
1066         r = (const uint8_t *)addr + roundup(size, KASAN_ALLOCA_SCALE_SIZE);
1067
1068         kasan_shadow_Nbyte_fill(l, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_LEFT);
1069         kasan_mark(addr, size, roundup(size, KASAN_ALLOCA_SCALE_SIZE),
1070             KASAN_STACK_MID);
1071         kasan_shadow_Nbyte_fill(r, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_RIGHT);
1072 }
1073
1074 void
1075 __asan_allocas_unpoison(const void *stkbegin, const void *stkend)
1076 {
1077         size_t size;
1078
1079         if (__predict_false(!stkbegin))
1080                 return;
1081         if (__predict_false((uintptr_t)stkbegin > (uintptr_t)stkend))
1082                 return;
1083         size = (uintptr_t)stkend - (uintptr_t)stkbegin;
1084
1085         kasan_shadow_Nbyte_fill(stkbegin, size, 0);
1086 }
1087
1088 void __asan_poison_memory_region(const void *addr, size_t size);
1089 void __asan_unpoison_memory_region(const void *addr, size_t size);
1090
1091 void
1092 __asan_poison_memory_region(const void *addr, size_t size)
1093 {
1094 }
1095
1096 void
1097 __asan_unpoison_memory_region(const void *addr, size_t size)
1098 {
1099 }