subr_asan.c revision 1.19
1 /* $NetBSD: subr_asan.c,v 1.19 2020/04/03 18:12:39 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2018-2020 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Maxime Villard. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: subr_asan.c,v 1.19 2020/04/03 18:12:39 maxv Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/device.h> 37 #include <sys/kernel.h> 38 #include <sys/param.h> 39 #include <sys/conf.h> 40 #include <sys/systm.h> 41 #include <sys/types.h> 42 #include <sys/asan.h> 43 44 #include <uvm/uvm.h> 45 46 #ifdef KASAN_PANIC 47 #define REPORT panic 48 #else 49 #define REPORT printf 50 #endif 51 52 /* ASAN constants. Part of the compiler ABI. */ 53 #define KASAN_SHADOW_SCALE_SHIFT 3 54 #define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT) 55 #define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1) 56 #define KASAN_ALLOCA_SCALE_SIZE 32 57 58 /* The MD code. */ 59 #include <machine/asan.h> 60 61 /* ASAN ABI version. */ 62 #if defined(__clang__) && (__clang_major__ - 0 >= 6) 63 #define ASAN_ABI_VERSION 8 64 #elif __GNUC_PREREQ__(7, 1) && !defined(__clang__) 65 #define ASAN_ABI_VERSION 8 66 #elif __GNUC_PREREQ__(6, 1) && !defined(__clang__) 67 #define ASAN_ABI_VERSION 6 68 #else 69 #error "Unsupported compiler version" 70 #endif 71 72 #define __RET_ADDR (unsigned long)__builtin_return_address(0) 73 74 /* Global variable descriptor. Part of the compiler ABI. */ 75 struct __asan_global_source_location { 76 const char *filename; 77 int line_no; 78 int column_no; 79 }; 80 struct __asan_global { 81 const void *beg; /* address of the global variable */ 82 size_t size; /* size of the global variable */ 83 size_t size_with_redzone; /* size with the redzone */ 84 const void *name; /* name of the variable */ 85 const void *module_name; /* name of the module where the var is declared */ 86 unsigned long has_dynamic_init; /* the var has dyn initializer (c++) */ 87 struct __asan_global_source_location *location; 88 #if ASAN_ABI_VERSION >= 7 89 uintptr_t odr_indicator; /* the address of the ODR indicator symbol */ 90 #endif 91 }; 92 93 static bool kasan_enabled __read_mostly = false; 94 95 /* -------------------------------------------------------------------------- */ 96 97 void 98 kasan_shadow_map(void *addr, size_t size) 99 { 100 size_t sz, npages, i; 101 vaddr_t sva, eva; 102 103 KASSERT((vaddr_t)addr % KASAN_SHADOW_SCALE_SIZE == 0); 104 105 sz = roundup(size, KASAN_SHADOW_SCALE_SIZE) / KASAN_SHADOW_SCALE_SIZE; 106 107 sva = (vaddr_t)kasan_md_addr_to_shad(addr); 108 eva = (vaddr_t)kasan_md_addr_to_shad(addr) + sz; 109 110 sva = rounddown(sva, PAGE_SIZE); 111 eva = roundup(eva, PAGE_SIZE); 112 113 npages = (eva - sva) / PAGE_SIZE; 114 115 KASSERT(sva >= KASAN_MD_SHADOW_START && eva < KASAN_MD_SHADOW_END); 116 117 for (i = 0; i < npages; i++) { 118 kasan_md_shadow_map_page(sva + i * PAGE_SIZE); 119 } 120 } 121 122 static void 123 kasan_ctors(void) 124 { 125 extern uint64_t __CTOR_LIST__, __CTOR_END__; 126 size_t nentries, i; 127 uint64_t *ptr; 128 129 nentries = ((size_t)&__CTOR_END__ - (size_t)&__CTOR_LIST__) / 130 sizeof(uintptr_t); 131 132 ptr = &__CTOR_LIST__; 133 for (i = 0; i < nentries; i++) { 134 void (*func)(void); 135 136 func = (void *)(*ptr); 137 (*func)(); 138 139 ptr++; 140 } 141 } 142 143 void 144 kasan_early_init(void *stack) 145 { 146 kasan_md_early_init(stack); 147 } 148 149 void 150 kasan_init(void) 151 { 152 /* MD initialization. */ 153 kasan_md_init(); 154 155 /* Now officially enabled. */ 156 kasan_enabled = true; 157 158 /* Call the ASAN constructors. */ 159 kasan_ctors(); 160 } 161 162 static inline const char * 163 kasan_code_name(uint8_t code) 164 { 165 switch (code) { 166 case KASAN_GENERIC_REDZONE: 167 return "GenericRedZone"; 168 case KASAN_MALLOC_REDZONE: 169 return "MallocRedZone"; 170 case KASAN_KMEM_REDZONE: 171 return "KmemRedZone"; 172 case KASAN_POOL_REDZONE: 173 return "PoolRedZone"; 174 case KASAN_POOL_FREED: 175 return "PoolUseAfterFree"; 176 case 1 ... 7: 177 return "RedZonePartial"; 178 case KASAN_STACK_LEFT: 179 return "StackLeft"; 180 case KASAN_STACK_MID: 181 return "StackMiddle"; 182 case KASAN_STACK_RIGHT: 183 return "StackRight"; 184 case KASAN_USE_AFTER_RET: 185 return "UseAfterRet"; 186 case KASAN_USE_AFTER_SCOPE: 187 return "UseAfterScope"; 188 default: 189 return "Unknown"; 190 } 191 } 192 193 static void 194 kasan_report(unsigned long addr, size_t size, bool write, unsigned long pc, 195 uint8_t code) 196 { 197 REPORT("ASan: Unauthorized Access In %p: Addr %p [%zu byte%s, %s," 198 " %s]\n", 199 (void *)pc, (void *)addr, size, (size > 1 ? "s" : ""), 200 (write ? "write" : "read"), kasan_code_name(code)); 201 kasan_md_unwind(); 202 } 203 204 static __always_inline void 205 kasan_shadow_1byte_markvalid(unsigned long addr) 206 { 207 int8_t *byte = kasan_md_addr_to_shad((void *)addr); 208 int8_t last = (addr & KASAN_SHADOW_MASK) + 1; 209 210 *byte = last; 211 } 212 213 static __always_inline void 214 kasan_shadow_Nbyte_markvalid(const void *addr, size_t size) 215 { 216 size_t i; 217 218 for (i = 0; i < size; i++) { 219 kasan_shadow_1byte_markvalid((unsigned long)addr+i); 220 } 221 } 222 223 static __always_inline void 224 kasan_shadow_Nbyte_fill(const void *addr, size_t size, uint8_t code) 225 { 226 void *shad; 227 228 if (__predict_false(size == 0)) 229 return; 230 if (__predict_false(kasan_md_unsupported((vaddr_t)addr))) 231 return; 232 233 KASSERT((vaddr_t)addr % KASAN_SHADOW_SCALE_SIZE == 0); 234 KASSERT(size % KASAN_SHADOW_SCALE_SIZE == 0); 235 236 shad = (void *)kasan_md_addr_to_shad(addr); 237 size = size >> KASAN_SHADOW_SCALE_SHIFT; 238 239 __builtin_memset(shad, code, size); 240 } 241 242 void 243 kasan_add_redzone(size_t *size) 244 { 245 *size = roundup(*size, KASAN_SHADOW_SCALE_SIZE); 246 *size += KASAN_SHADOW_SCALE_SIZE; 247 } 248 249 void 250 kasan_softint(struct lwp *l) 251 { 252 const void *stk = (const void *)uvm_lwp_getuarea(l); 253 254 kasan_shadow_Nbyte_fill(stk, USPACE, 0); 255 } 256 257 /* 258 * In an area of size 'sz_with_redz', mark the 'size' first bytes as valid, 259 * and the rest as invalid. There are generally two use cases: 260 * 261 * o kasan_mark(addr, origsize, size, code), with origsize < size. This marks 262 * the redzone at the end of the buffer as invalid. 263 * 264 * o kasan_mark(addr, size, size, 0). This marks the entire buffer as valid. 265 */ 266 void 267 kasan_mark(const void *addr, size_t size, size_t sz_with_redz, uint8_t code) 268 { 269 size_t i, n, redz; 270 int8_t *shad; 271 272 KASSERT((vaddr_t)addr % KASAN_SHADOW_SCALE_SIZE == 0); 273 redz = sz_with_redz - roundup(size, KASAN_SHADOW_SCALE_SIZE); 274 KASSERT(redz % KASAN_SHADOW_SCALE_SIZE == 0); 275 shad = kasan_md_addr_to_shad(addr); 276 277 /* Chunks of 8 bytes, valid. */ 278 n = size / KASAN_SHADOW_SCALE_SIZE; 279 for (i = 0; i < n; i++) { 280 *shad++ = 0; 281 } 282 283 /* Possibly one chunk, mid. */ 284 if ((size & KASAN_SHADOW_MASK) != 0) { 285 *shad++ = (size & KASAN_SHADOW_MASK); 286 } 287 288 /* Chunks of 8 bytes, invalid. */ 289 n = redz / KASAN_SHADOW_SCALE_SIZE; 290 for (i = 0; i < n; i++) { 291 *shad++ = code; 292 } 293 } 294 295 /* -------------------------------------------------------------------------- */ 296 297 #define ADDR_CROSSES_SCALE_BOUNDARY(addr, size) \ 298 (addr >> KASAN_SHADOW_SCALE_SHIFT) != \ 299 ((addr + size - 1) >> KASAN_SHADOW_SCALE_SHIFT) 300 301 static __always_inline bool 302 kasan_shadow_1byte_isvalid(unsigned long addr, uint8_t *code) 303 { 304 int8_t *byte = kasan_md_addr_to_shad((void *)addr); 305 int8_t last = (addr & KASAN_SHADOW_MASK) + 1; 306 307 if (__predict_true(*byte == 0 || last <= *byte)) { 308 return true; 309 } 310 *code = *byte; 311 return false; 312 } 313 314 static __always_inline bool 315 kasan_shadow_2byte_isvalid(unsigned long addr, uint8_t *code) 316 { 317 int8_t *byte, last; 318 319 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 2)) { 320 return (kasan_shadow_1byte_isvalid(addr, code) && 321 kasan_shadow_1byte_isvalid(addr+1, code)); 322 } 323 324 byte = kasan_md_addr_to_shad((void *)addr); 325 last = ((addr + 1) & KASAN_SHADOW_MASK) + 1; 326 327 if (__predict_true(*byte == 0 || last <= *byte)) { 328 return true; 329 } 330 *code = *byte; 331 return false; 332 } 333 334 static __always_inline bool 335 kasan_shadow_4byte_isvalid(unsigned long addr, uint8_t *code) 336 { 337 int8_t *byte, last; 338 339 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 4)) { 340 return (kasan_shadow_2byte_isvalid(addr, code) && 341 kasan_shadow_2byte_isvalid(addr+2, code)); 342 } 343 344 byte = kasan_md_addr_to_shad((void *)addr); 345 last = ((addr + 3) & KASAN_SHADOW_MASK) + 1; 346 347 if (__predict_true(*byte == 0 || last <= *byte)) { 348 return true; 349 } 350 *code = *byte; 351 return false; 352 } 353 354 static __always_inline bool 355 kasan_shadow_8byte_isvalid(unsigned long addr, uint8_t *code) 356 { 357 int8_t *byte, last; 358 359 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 8)) { 360 return (kasan_shadow_4byte_isvalid(addr, code) && 361 kasan_shadow_4byte_isvalid(addr+4, code)); 362 } 363 364 byte = kasan_md_addr_to_shad((void *)addr); 365 last = ((addr + 7) & KASAN_SHADOW_MASK) + 1; 366 367 if (__predict_true(*byte == 0 || last <= *byte)) { 368 return true; 369 } 370 *code = *byte; 371 return false; 372 } 373 374 static __always_inline bool 375 kasan_shadow_Nbyte_isvalid(unsigned long addr, size_t size, uint8_t *code) 376 { 377 size_t i; 378 379 for (i = 0; i < size; i++) { 380 if (!kasan_shadow_1byte_isvalid(addr+i, code)) 381 return false; 382 } 383 384 return true; 385 } 386 387 static __always_inline void 388 kasan_shadow_check(unsigned long addr, size_t size, bool write, 389 unsigned long retaddr) 390 { 391 uint8_t code; 392 bool valid; 393 394 if (__predict_false(!kasan_enabled)) 395 return; 396 if (__predict_false(size == 0)) 397 return; 398 if (__predict_false(kasan_md_unsupported(addr))) 399 return; 400 401 if (__builtin_constant_p(size)) { 402 switch (size) { 403 case 1: 404 valid = kasan_shadow_1byte_isvalid(addr, &code); 405 break; 406 case 2: 407 valid = kasan_shadow_2byte_isvalid(addr, &code); 408 break; 409 case 4: 410 valid = kasan_shadow_4byte_isvalid(addr, &code); 411 break; 412 case 8: 413 valid = kasan_shadow_8byte_isvalid(addr, &code); 414 break; 415 default: 416 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code); 417 break; 418 } 419 } else { 420 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code); 421 } 422 423 if (__predict_false(!valid)) { 424 kasan_report(addr, size, write, retaddr, code); 425 } 426 } 427 428 /* -------------------------------------------------------------------------- */ 429 430 void * 431 kasan_memcpy(void *dst, const void *src, size_t len) 432 { 433 kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR); 434 kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR); 435 return __builtin_memcpy(dst, src, len); 436 } 437 438 int 439 kasan_memcmp(const void *b1, const void *b2, size_t len) 440 { 441 kasan_shadow_check((unsigned long)b1, len, false, __RET_ADDR); 442 kasan_shadow_check((unsigned long)b2, len, false, __RET_ADDR); 443 return __builtin_memcmp(b1, b2, len); 444 } 445 446 void * 447 kasan_memset(void *b, int c, size_t len) 448 { 449 kasan_shadow_check((unsigned long)b, len, true, __RET_ADDR); 450 return __builtin_memset(b, c, len); 451 } 452 453 void * 454 kasan_memmove(void *dst, const void *src, size_t len) 455 { 456 kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR); 457 kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR); 458 return __builtin_memmove(dst, src, len); 459 } 460 461 char * 462 kasan_strcpy(char *dst, const char *src) 463 { 464 char *save = dst; 465 466 while (1) { 467 kasan_shadow_check((unsigned long)src, 1, false, __RET_ADDR); 468 kasan_shadow_check((unsigned long)dst, 1, true, __RET_ADDR); 469 *dst = *src; 470 if (*src == '\0') 471 break; 472 src++, dst++; 473 } 474 475 return save; 476 } 477 478 int 479 kasan_strcmp(const char *s1, const char *s2) 480 { 481 while (1) { 482 kasan_shadow_check((unsigned long)s1, 1, false, __RET_ADDR); 483 kasan_shadow_check((unsigned long)s2, 1, false, __RET_ADDR); 484 if (*s1 != *s2) 485 break; 486 if (*s1 == '\0') 487 return 0; 488 s1++, s2++; 489 } 490 491 return (*(const unsigned char *)s1 - *(const unsigned char *)s2); 492 } 493 494 size_t 495 kasan_strlen(const char *str) 496 { 497 const char *s; 498 499 s = str; 500 while (1) { 501 kasan_shadow_check((unsigned long)s, 1, false, __RET_ADDR); 502 if (*s == '\0') 503 break; 504 s++; 505 } 506 507 return (s - str); 508 } 509 510 #undef kcopy 511 #undef copystr 512 #undef copyinstr 513 #undef copyoutstr 514 #undef copyin 515 516 int kasan_kcopy(const void *, void *, size_t); 517 int kasan_copystr(const void *, void *, size_t, size_t *); 518 int kasan_copyinstr(const void *, void *, size_t, size_t *); 519 int kasan_copyoutstr(const void *, void *, size_t, size_t *); 520 int kasan_copyin(const void *, void *, size_t); 521 int kcopy(const void *, void *, size_t); 522 int copystr(const void *, void *, size_t, size_t *); 523 int copyinstr(const void *, void *, size_t, size_t *); 524 int copyoutstr(const void *, void *, size_t, size_t *); 525 int copyin(const void *, void *, size_t); 526 527 int 528 kasan_kcopy(const void *src, void *dst, size_t len) 529 { 530 kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR); 531 kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR); 532 return kcopy(src, dst, len); 533 } 534 535 int 536 kasan_copystr(const void *kfaddr, void *kdaddr, size_t len, size_t *done) 537 { 538 kasan_shadow_check((unsigned long)kdaddr, len, true, __RET_ADDR); 539 return copystr(kfaddr, kdaddr, len, done); 540 } 541 542 int 543 kasan_copyin(const void *uaddr, void *kaddr, size_t len) 544 { 545 kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR); 546 return copyin(uaddr, kaddr, len); 547 } 548 549 int 550 kasan_copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done) 551 { 552 kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR); 553 return copyinstr(uaddr, kaddr, len, done); 554 } 555 556 int 557 kasan_copyoutstr(const void *kaddr, void *uaddr, size_t len, size_t *done) 558 { 559 kasan_shadow_check((unsigned long)kaddr, len, false, __RET_ADDR); 560 return copyoutstr(kaddr, uaddr, len, done); 561 } 562 563 /* -------------------------------------------------------------------------- */ 564 565 #undef _ucas_32 566 #undef _ucas_32_mp 567 #undef _ucas_64 568 #undef _ucas_64_mp 569 #undef _ufetch_8 570 #undef _ufetch_16 571 #undef _ufetch_32 572 #undef _ufetch_64 573 574 int _ucas_32(volatile uint32_t *, uint32_t, uint32_t, uint32_t *); 575 int kasan__ucas_32(volatile uint32_t *, uint32_t, uint32_t, uint32_t *); 576 int 577 kasan__ucas_32(volatile uint32_t *uaddr, uint32_t old, uint32_t new, 578 uint32_t *ret) 579 { 580 kasan_shadow_check((unsigned long)ret, sizeof(*ret), true, 581 __RET_ADDR); 582 return _ucas_32(uaddr, old, new, ret); 583 } 584 585 #ifdef __HAVE_UCAS_MP 586 int _ucas_32_mp(volatile uint32_t *, uint32_t, uint32_t, uint32_t *); 587 int kasan__ucas_32_mp(volatile uint32_t *, uint32_t, uint32_t, uint32_t *); 588 int 589 kasan__ucas_32_mp(volatile uint32_t *uaddr, uint32_t old, uint32_t new, 590 uint32_t *ret) 591 { 592 kasan_shadow_check((unsigned long)ret, sizeof(*ret), true, 593 __RET_ADDR); 594 return _ucas_32_mp(uaddr, old, new, ret); 595 } 596 #endif 597 598 #ifdef _LP64 599 int _ucas_64(volatile uint64_t *, uint64_t, uint64_t, uint64_t *); 600 int kasan__ucas_64(volatile uint64_t *, uint64_t, uint64_t, uint64_t *); 601 int 602 kasan__ucas_64(volatile uint64_t *uaddr, uint64_t old, uint64_t new, 603 uint64_t *ret) 604 { 605 kasan_shadow_check((unsigned long)ret, sizeof(*ret), true, 606 __RET_ADDR); 607 return _ucas_64(uaddr, old, new, ret); 608 } 609 610 #ifdef __HAVE_UCAS_MP 611 int _ucas_64_mp(volatile uint64_t *, uint64_t, uint64_t, uint64_t *); 612 int kasan__ucas_64_mp(volatile uint64_t *, uint64_t, uint64_t, uint64_t *); 613 int 614 kasan__ucas_64_mp(volatile uint64_t *uaddr, uint64_t old, uint64_t new, 615 uint64_t *ret) 616 { 617 kasan_shadow_check((unsigned long)ret, sizeof(*ret), true, 618 __RET_ADDR); 619 return _ucas_64_mp(uaddr, old, new, ret); 620 } 621 #endif 622 #endif 623 624 int _ufetch_8(const uint8_t *, uint8_t *); 625 int kasan__ufetch_8(const uint8_t *, uint8_t *); 626 int 627 kasan__ufetch_8(const uint8_t *uaddr, uint8_t *valp) 628 { 629 kasan_shadow_check((unsigned long)valp, sizeof(*valp), true, 630 __RET_ADDR); 631 return _ufetch_8(uaddr, valp); 632 } 633 634 int _ufetch_16(const uint16_t *, uint16_t *); 635 int kasan__ufetch_16(const uint16_t *, uint16_t *); 636 int 637 kasan__ufetch_16(const uint16_t *uaddr, uint16_t *valp) 638 { 639 kasan_shadow_check((unsigned long)valp, sizeof(*valp), true, 640 __RET_ADDR); 641 return _ufetch_16(uaddr, valp); 642 } 643 644 int _ufetch_32(const uint32_t *, uint32_t *); 645 int kasan__ufetch_32(const uint32_t *, uint32_t *); 646 int 647 kasan__ufetch_32(const uint32_t *uaddr, uint32_t *valp) 648 { 649 kasan_shadow_check((unsigned long)valp, sizeof(*valp), true, 650 __RET_ADDR); 651 return _ufetch_32(uaddr, valp); 652 } 653 654 #ifdef _LP64 655 int _ufetch_64(const uint64_t *, uint64_t *); 656 int kasan__ufetch_64(const uint64_t *, uint64_t *); 657 int 658 kasan__ufetch_64(const uint64_t *uaddr, uint64_t *valp) 659 { 660 kasan_shadow_check((unsigned long)valp, sizeof(*valp), true, 661 __RET_ADDR); 662 return _ufetch_64(uaddr, valp); 663 } 664 #endif 665 666 /* -------------------------------------------------------------------------- */ 667 668 #undef atomic_add_32 669 #undef atomic_add_int 670 #undef atomic_add_long 671 #undef atomic_add_ptr 672 #undef atomic_add_64 673 #undef atomic_add_32_nv 674 #undef atomic_add_int_nv 675 #undef atomic_add_long_nv 676 #undef atomic_add_ptr_nv 677 #undef atomic_add_64_nv 678 #undef atomic_and_32 679 #undef atomic_and_uint 680 #undef atomic_and_ulong 681 #undef atomic_and_64 682 #undef atomic_and_32_nv 683 #undef atomic_and_uint_nv 684 #undef atomic_and_ulong_nv 685 #undef atomic_and_64_nv 686 #undef atomic_or_32 687 #undef atomic_or_uint 688 #undef atomic_or_ulong 689 #undef atomic_or_64 690 #undef atomic_or_32_nv 691 #undef atomic_or_uint_nv 692 #undef atomic_or_ulong_nv 693 #undef atomic_or_64_nv 694 #undef atomic_cas_32 695 #undef atomic_cas_uint 696 #undef atomic_cas_ulong 697 #undef atomic_cas_ptr 698 #undef atomic_cas_64 699 #undef atomic_cas_32_ni 700 #undef atomic_cas_uint_ni 701 #undef atomic_cas_ulong_ni 702 #undef atomic_cas_ptr_ni 703 #undef atomic_cas_64_ni 704 #undef atomic_swap_32 705 #undef atomic_swap_uint 706 #undef atomic_swap_ulong 707 #undef atomic_swap_ptr 708 #undef atomic_swap_64 709 #undef atomic_dec_32 710 #undef atomic_dec_uint 711 #undef atomic_dec_ulong 712 #undef atomic_dec_ptr 713 #undef atomic_dec_64 714 #undef atomic_dec_32_nv 715 #undef atomic_dec_uint_nv 716 #undef atomic_dec_ulong_nv 717 #undef atomic_dec_ptr_nv 718 #undef atomic_dec_64_nv 719 #undef atomic_inc_32 720 #undef atomic_inc_uint 721 #undef atomic_inc_ulong 722 #undef atomic_inc_ptr 723 #undef atomic_inc_64 724 #undef atomic_inc_32_nv 725 #undef atomic_inc_uint_nv 726 #undef atomic_inc_ulong_nv 727 #undef atomic_inc_ptr_nv 728 #undef atomic_inc_64_nv 729 730 #define ASAN_ATOMIC_FUNC_ADD(name, tret, targ1, targ2) \ 731 void atomic_add_##name(volatile targ1 *, targ2); \ 732 void kasan_atomic_add_##name(volatile targ1 *, targ2); \ 733 void kasan_atomic_add_##name(volatile targ1 *ptr, targ2 val) \ 734 { \ 735 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 736 __RET_ADDR); \ 737 atomic_add_##name(ptr, val); \ 738 } \ 739 tret atomic_add_##name##_nv(volatile targ1 *, targ2); \ 740 tret kasan_atomic_add_##name##_nv(volatile targ1 *, targ2); \ 741 tret kasan_atomic_add_##name##_nv(volatile targ1 *ptr, targ2 val) \ 742 { \ 743 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 744 __RET_ADDR); \ 745 return atomic_add_##name##_nv(ptr, val); \ 746 } 747 748 #define ASAN_ATOMIC_FUNC_AND(name, tret, targ1, targ2) \ 749 void atomic_and_##name(volatile targ1 *, targ2); \ 750 void kasan_atomic_and_##name(volatile targ1 *, targ2); \ 751 void kasan_atomic_and_##name(volatile targ1 *ptr, targ2 val) \ 752 { \ 753 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 754 __RET_ADDR); \ 755 atomic_and_##name(ptr, val); \ 756 } \ 757 tret atomic_and_##name##_nv(volatile targ1 *, targ2); \ 758 tret kasan_atomic_and_##name##_nv(volatile targ1 *, targ2); \ 759 tret kasan_atomic_and_##name##_nv(volatile targ1 *ptr, targ2 val) \ 760 { \ 761 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 762 __RET_ADDR); \ 763 return atomic_and_##name##_nv(ptr, val); \ 764 } 765 766 #define ASAN_ATOMIC_FUNC_OR(name, tret, targ1, targ2) \ 767 void atomic_or_##name(volatile targ1 *, targ2); \ 768 void kasan_atomic_or_##name(volatile targ1 *, targ2); \ 769 void kasan_atomic_or_##name(volatile targ1 *ptr, targ2 val) \ 770 { \ 771 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 772 __RET_ADDR); \ 773 atomic_or_##name(ptr, val); \ 774 } \ 775 tret atomic_or_##name##_nv(volatile targ1 *, targ2); \ 776 tret kasan_atomic_or_##name##_nv(volatile targ1 *, targ2); \ 777 tret kasan_atomic_or_##name##_nv(volatile targ1 *ptr, targ2 val) \ 778 { \ 779 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 780 __RET_ADDR); \ 781 return atomic_or_##name##_nv(ptr, val); \ 782 } 783 784 #define ASAN_ATOMIC_FUNC_CAS(name, tret, targ1, targ2) \ 785 tret atomic_cas_##name(volatile targ1 *, targ2, targ2); \ 786 tret kasan_atomic_cas_##name(volatile targ1 *, targ2, targ2); \ 787 tret kasan_atomic_cas_##name(volatile targ1 *ptr, targ2 exp, targ2 new) \ 788 { \ 789 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 790 __RET_ADDR); \ 791 return atomic_cas_##name(ptr, exp, new); \ 792 } \ 793 tret atomic_cas_##name##_ni(volatile targ1 *, targ2, targ2); \ 794 tret kasan_atomic_cas_##name##_ni(volatile targ1 *, targ2, targ2); \ 795 tret kasan_atomic_cas_##name##_ni(volatile targ1 *ptr, targ2 exp, targ2 new) \ 796 { \ 797 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 798 __RET_ADDR); \ 799 return atomic_cas_##name##_ni(ptr, exp, new); \ 800 } 801 802 #define ASAN_ATOMIC_FUNC_SWAP(name, tret, targ1, targ2) \ 803 tret atomic_swap_##name(volatile targ1 *, targ2); \ 804 tret kasan_atomic_swap_##name(volatile targ1 *, targ2); \ 805 tret kasan_atomic_swap_##name(volatile targ1 *ptr, targ2 val) \ 806 { \ 807 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 808 __RET_ADDR); \ 809 return atomic_swap_##name(ptr, val); \ 810 } 811 812 #define ASAN_ATOMIC_FUNC_DEC(name, tret, targ1) \ 813 void atomic_dec_##name(volatile targ1 *); \ 814 void kasan_atomic_dec_##name(volatile targ1 *); \ 815 void kasan_atomic_dec_##name(volatile targ1 *ptr) \ 816 { \ 817 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 818 __RET_ADDR); \ 819 atomic_dec_##name(ptr); \ 820 } \ 821 tret atomic_dec_##name##_nv(volatile targ1 *); \ 822 tret kasan_atomic_dec_##name##_nv(volatile targ1 *); \ 823 tret kasan_atomic_dec_##name##_nv(volatile targ1 *ptr) \ 824 { \ 825 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 826 __RET_ADDR); \ 827 return atomic_dec_##name##_nv(ptr); \ 828 } 829 830 #define ASAN_ATOMIC_FUNC_INC(name, tret, targ1) \ 831 void atomic_inc_##name(volatile targ1 *); \ 832 void kasan_atomic_inc_##name(volatile targ1 *); \ 833 void kasan_atomic_inc_##name(volatile targ1 *ptr) \ 834 { \ 835 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 836 __RET_ADDR); \ 837 atomic_inc_##name(ptr); \ 838 } \ 839 tret atomic_inc_##name##_nv(volatile targ1 *); \ 840 tret kasan_atomic_inc_##name##_nv(volatile targ1 *); \ 841 tret kasan_atomic_inc_##name##_nv(volatile targ1 *ptr) \ 842 { \ 843 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 844 __RET_ADDR); \ 845 return atomic_inc_##name##_nv(ptr); \ 846 } 847 848 ASAN_ATOMIC_FUNC_ADD(32, uint32_t, uint32_t, int32_t); 849 ASAN_ATOMIC_FUNC_ADD(64, uint64_t, uint64_t, int64_t); 850 ASAN_ATOMIC_FUNC_ADD(int, unsigned int, unsigned int, int); 851 ASAN_ATOMIC_FUNC_ADD(long, unsigned long, unsigned long, long); 852 ASAN_ATOMIC_FUNC_ADD(ptr, void *, void, ssize_t); 853 854 ASAN_ATOMIC_FUNC_AND(32, uint32_t, uint32_t, uint32_t); 855 ASAN_ATOMIC_FUNC_AND(64, uint64_t, uint64_t, uint64_t); 856 ASAN_ATOMIC_FUNC_AND(uint, unsigned int, unsigned int, unsigned int); 857 ASAN_ATOMIC_FUNC_AND(ulong, unsigned long, unsigned long, unsigned long); 858 859 ASAN_ATOMIC_FUNC_OR(32, uint32_t, uint32_t, uint32_t); 860 ASAN_ATOMIC_FUNC_OR(64, uint64_t, uint64_t, uint64_t); 861 ASAN_ATOMIC_FUNC_OR(uint, unsigned int, unsigned int, unsigned int); 862 ASAN_ATOMIC_FUNC_OR(ulong, unsigned long, unsigned long, unsigned long); 863 864 ASAN_ATOMIC_FUNC_CAS(32, uint32_t, uint32_t, uint32_t); 865 ASAN_ATOMIC_FUNC_CAS(64, uint64_t, uint64_t, uint64_t); 866 ASAN_ATOMIC_FUNC_CAS(uint, unsigned int, unsigned int, unsigned int); 867 ASAN_ATOMIC_FUNC_CAS(ulong, unsigned long, unsigned long, unsigned long); 868 ASAN_ATOMIC_FUNC_CAS(ptr, void *, void, void *); 869 870 ASAN_ATOMIC_FUNC_SWAP(32, uint32_t, uint32_t, uint32_t); 871 ASAN_ATOMIC_FUNC_SWAP(64, uint64_t, uint64_t, uint64_t); 872 ASAN_ATOMIC_FUNC_SWAP(uint, unsigned int, unsigned int, unsigned int); 873 ASAN_ATOMIC_FUNC_SWAP(ulong, unsigned long, unsigned long, unsigned long); 874 ASAN_ATOMIC_FUNC_SWAP(ptr, void *, void, void *); 875 876 ASAN_ATOMIC_FUNC_DEC(32, uint32_t, uint32_t) 877 ASAN_ATOMIC_FUNC_DEC(64, uint64_t, uint64_t) 878 ASAN_ATOMIC_FUNC_DEC(uint, unsigned int, unsigned int); 879 ASAN_ATOMIC_FUNC_DEC(ulong, unsigned long, unsigned long); 880 ASAN_ATOMIC_FUNC_DEC(ptr, void *, void); 881 882 ASAN_ATOMIC_FUNC_INC(32, uint32_t, uint32_t) 883 ASAN_ATOMIC_FUNC_INC(64, uint64_t, uint64_t) 884 ASAN_ATOMIC_FUNC_INC(uint, unsigned int, unsigned int); 885 ASAN_ATOMIC_FUNC_INC(ulong, unsigned long, unsigned long); 886 ASAN_ATOMIC_FUNC_INC(ptr, void *, void); 887 888 /* -------------------------------------------------------------------------- */ 889 890 #ifdef __HAVE_KASAN_INSTR_BUS 891 892 #include <sys/bus.h> 893 894 #undef bus_space_read_multi_1 895 #undef bus_space_read_multi_2 896 #undef bus_space_read_multi_4 897 #undef bus_space_read_multi_8 898 #undef bus_space_read_multi_stream_1 899 #undef bus_space_read_multi_stream_2 900 #undef bus_space_read_multi_stream_4 901 #undef bus_space_read_multi_stream_8 902 #undef bus_space_read_region_1 903 #undef bus_space_read_region_2 904 #undef bus_space_read_region_4 905 #undef bus_space_read_region_8 906 #undef bus_space_read_region_stream_1 907 #undef bus_space_read_region_stream_2 908 #undef bus_space_read_region_stream_4 909 #undef bus_space_read_region_stream_8 910 #undef bus_space_write_multi_1 911 #undef bus_space_write_multi_2 912 #undef bus_space_write_multi_4 913 #undef bus_space_write_multi_8 914 #undef bus_space_write_multi_stream_1 915 #undef bus_space_write_multi_stream_2 916 #undef bus_space_write_multi_stream_4 917 #undef bus_space_write_multi_stream_8 918 #undef bus_space_write_region_1 919 #undef bus_space_write_region_2 920 #undef bus_space_write_region_4 921 #undef bus_space_write_region_8 922 #undef bus_space_write_region_stream_1 923 #undef bus_space_write_region_stream_2 924 #undef bus_space_write_region_stream_4 925 #undef bus_space_write_region_stream_8 926 927 #define ASAN_BUS_READ_FUNC(bytes, bits) \ 928 void bus_space_read_multi_##bytes(bus_space_tag_t, bus_space_handle_t, \ 929 bus_size_t, uint##bits##_t *, bus_size_t); \ 930 void kasan_bus_space_read_multi_##bytes(bus_space_tag_t, \ 931 bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t); \ 932 void kasan_bus_space_read_multi_##bytes(bus_space_tag_t tag, \ 933 bus_space_handle_t hnd, bus_size_t size, uint##bits##_t *buf, \ 934 bus_size_t count) \ 935 { \ 936 kasan_shadow_check((uintptr_t)buf, \ 937 sizeof(uint##bits##_t) * count, false, __RET_ADDR); \ 938 bus_space_read_multi_##bytes(tag, hnd, size, buf, count); \ 939 } \ 940 void bus_space_read_multi_stream_##bytes(bus_space_tag_t, \ 941 bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t); \ 942 void kasan_bus_space_read_multi_stream_##bytes(bus_space_tag_t, \ 943 bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t); \ 944 void kasan_bus_space_read_multi_stream_##bytes(bus_space_tag_t tag, \ 945 bus_space_handle_t hnd, bus_size_t size, uint##bits##_t *buf, \ 946 bus_size_t count) \ 947 { \ 948 kasan_shadow_check((uintptr_t)buf, \ 949 sizeof(uint##bits##_t) * count, false, __RET_ADDR); \ 950 bus_space_read_multi_stream_##bytes(tag, hnd, size, buf, count);\ 951 } \ 952 void bus_space_read_region_##bytes(bus_space_tag_t, bus_space_handle_t, \ 953 bus_size_t, uint##bits##_t *, bus_size_t); \ 954 void kasan_bus_space_read_region_##bytes(bus_space_tag_t, \ 955 bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t); \ 956 void kasan_bus_space_read_region_##bytes(bus_space_tag_t tag, \ 957 bus_space_handle_t hnd, bus_size_t size, uint##bits##_t *buf, \ 958 bus_size_t count) \ 959 { \ 960 kasan_shadow_check((uintptr_t)buf, \ 961 sizeof(uint##bits##_t) * count, false, __RET_ADDR); \ 962 bus_space_read_region_##bytes(tag, hnd, size, buf, count); \ 963 } \ 964 void bus_space_read_region_stream_##bytes(bus_space_tag_t, \ 965 bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t); \ 966 void kasan_bus_space_read_region_stream_##bytes(bus_space_tag_t, \ 967 bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t); \ 968 void kasan_bus_space_read_region_stream_##bytes(bus_space_tag_t tag, \ 969 bus_space_handle_t hnd, bus_size_t size, uint##bits##_t *buf, \ 970 bus_size_t count) \ 971 { \ 972 kasan_shadow_check((uintptr_t)buf, \ 973 sizeof(uint##bits##_t) * count, false, __RET_ADDR); \ 974 bus_space_read_region_stream_##bytes(tag, hnd, size, buf, count);\ 975 } 976 977 #define ASAN_BUS_WRITE_FUNC(bytes, bits) \ 978 void bus_space_write_multi_##bytes(bus_space_tag_t, bus_space_handle_t, \ 979 bus_size_t, const uint##bits##_t *, bus_size_t); \ 980 void kasan_bus_space_write_multi_##bytes(bus_space_tag_t, \ 981 bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\ 982 void kasan_bus_space_write_multi_##bytes(bus_space_tag_t tag, \ 983 bus_space_handle_t hnd, bus_size_t size, const uint##bits##_t *buf, \ 984 bus_size_t count) \ 985 { \ 986 kasan_shadow_check((uintptr_t)buf, \ 987 sizeof(uint##bits##_t) * count, true, __RET_ADDR); \ 988 bus_space_write_multi_##bytes(tag, hnd, size, buf, count); \ 989 } \ 990 void bus_space_write_multi_stream_##bytes(bus_space_tag_t, \ 991 bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\ 992 void kasan_bus_space_write_multi_stream_##bytes(bus_space_tag_t, \ 993 bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\ 994 void kasan_bus_space_write_multi_stream_##bytes(bus_space_tag_t tag, \ 995 bus_space_handle_t hnd, bus_size_t size, const uint##bits##_t *buf, \ 996 bus_size_t count) \ 997 { \ 998 kasan_shadow_check((uintptr_t)buf, \ 999 sizeof(uint##bits##_t) * count, true, __RET_ADDR); \ 1000 bus_space_write_multi_stream_##bytes(tag, hnd, size, buf, count);\ 1001 } \ 1002 void bus_space_write_region_##bytes(bus_space_tag_t, bus_space_handle_t,\ 1003 bus_size_t, const uint##bits##_t *, bus_size_t); \ 1004 void kasan_bus_space_write_region_##bytes(bus_space_tag_t, \ 1005 bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\ 1006 void kasan_bus_space_write_region_##bytes(bus_space_tag_t tag, \ 1007 bus_space_handle_t hnd, bus_size_t size, const uint##bits##_t *buf, \ 1008 bus_size_t count) \ 1009 { \ 1010 kasan_shadow_check((uintptr_t)buf, \ 1011 sizeof(uint##bits##_t) * count, true, __RET_ADDR); \ 1012 bus_space_write_region_##bytes(tag, hnd, size, buf, count); \ 1013 } \ 1014 void bus_space_write_region_stream_##bytes(bus_space_tag_t, \ 1015 bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\ 1016 void kasan_bus_space_write_region_stream_##bytes(bus_space_tag_t, \ 1017 bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\ 1018 void kasan_bus_space_write_region_stream_##bytes(bus_space_tag_t tag, \ 1019 bus_space_handle_t hnd, bus_size_t size, const uint##bits##_t *buf, \ 1020 bus_size_t count) \ 1021 { \ 1022 kasan_shadow_check((uintptr_t)buf, \ 1023 sizeof(uint##bits##_t) * count, true, __RET_ADDR); \ 1024 bus_space_write_region_stream_##bytes(tag, hnd, size, buf, count);\ 1025 } 1026 1027 ASAN_BUS_READ_FUNC(1, 8) 1028 ASAN_BUS_READ_FUNC(2, 16) 1029 ASAN_BUS_READ_FUNC(4, 32) 1030 ASAN_BUS_READ_FUNC(8, 64) 1031 1032 ASAN_BUS_WRITE_FUNC(1, 8) 1033 ASAN_BUS_WRITE_FUNC(2, 16) 1034 ASAN_BUS_WRITE_FUNC(4, 32) 1035 ASAN_BUS_WRITE_FUNC(8, 64) 1036 1037 #endif /* __HAVE_KASAN_INSTR_BUS */ 1038 1039 /* -------------------------------------------------------------------------- */ 1040 1041 #ifdef __HAVE_KASAN_INSTR_DMA 1042 1043 #include <sys/mbuf.h> 1044 1045 static void 1046 kasan_dma_sync_linear(uint8_t *buf, bus_addr_t offset, bus_size_t len, 1047 bool write, uintptr_t pc) 1048 { 1049 kasan_shadow_check((uintptr_t)(buf + offset), len, write, pc); 1050 } 1051 1052 static void 1053 kasan_dma_sync_mbuf(struct mbuf *m, bus_addr_t offset, bus_size_t len, 1054 bool write, uintptr_t pc) 1055 { 1056 bus_addr_t minlen; 1057 1058 for (; m != NULL && len != 0; m = m->m_next) { 1059 kasan_shadow_check((uintptr_t)m, sizeof(*m), false, pc); 1060 1061 if (offset >= m->m_len) { 1062 offset -= m->m_len; 1063 continue; 1064 } 1065 1066 minlen = MIN(len, m->m_len - offset); 1067 kasan_shadow_check((uintptr_t)(mtod(m, char *) + offset), 1068 minlen, write, pc); 1069 1070 offset = 0; 1071 len -= minlen; 1072 } 1073 } 1074 1075 static void 1076 kasan_dma_sync_uio(struct uio *uio, bus_addr_t offset, bus_size_t len, 1077 bool write, uintptr_t pc) 1078 { 1079 bus_size_t minlen, resid; 1080 struct iovec *iov; 1081 int i; 1082 1083 kasan_shadow_check((uintptr_t)uio, sizeof(struct uio), false, pc); 1084 1085 if (!VMSPACE_IS_KERNEL_P(uio->uio_vmspace)) 1086 return; 1087 1088 resid = uio->uio_resid; 1089 iov = uio->uio_iov; 1090 1091 for (i = 0; i < uio->uio_iovcnt && resid != 0; i++) { 1092 kasan_shadow_check((uintptr_t)&iov[i], sizeof(iov[i]), 1093 false, pc); 1094 minlen = MIN(resid, iov[i].iov_len); 1095 kasan_shadow_check((uintptr_t)iov[i].iov_base, minlen, 1096 write, pc); 1097 resid -= minlen; 1098 } 1099 } 1100 1101 void 1102 kasan_dma_sync(bus_dmamap_t map, bus_addr_t offset, bus_size_t len, int ops) 1103 { 1104 bool write = (ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTWRITE)) != 0; 1105 1106 switch (map->dm_buftype) { 1107 case KASAN_DMA_LINEAR: 1108 kasan_dma_sync_linear(map->dm_buf, offset, len, write, 1109 __RET_ADDR); 1110 break; 1111 case KASAN_DMA_MBUF: 1112 kasan_dma_sync_mbuf(map->dm_buf, offset, len, write, 1113 __RET_ADDR); 1114 break; 1115 case KASAN_DMA_UIO: 1116 kasan_dma_sync_uio(map->dm_buf, offset, len, write, 1117 __RET_ADDR); 1118 break; 1119 case KASAN_DMA_RAW: 1120 break; 1121 default: 1122 panic("%s: impossible", __func__); 1123 } 1124 } 1125 1126 void 1127 kasan_dma_load(bus_dmamap_t map, void *buf, bus_size_t buflen, int type) 1128 { 1129 map->dm_buf = buf; 1130 map->dm_buflen = buflen; 1131 map->dm_buftype = type; 1132 } 1133 1134 #endif /* __HAVE_KASAN_INSTR_DMA */ 1135 1136 /* -------------------------------------------------------------------------- */ 1137 1138 void __asan_register_globals(struct __asan_global *, size_t); 1139 void __asan_unregister_globals(struct __asan_global *, size_t); 1140 1141 void 1142 __asan_register_globals(struct __asan_global *globals, size_t n) 1143 { 1144 size_t i; 1145 1146 for (i = 0; i < n; i++) { 1147 kasan_mark(globals[i].beg, globals[i].size, 1148 globals[i].size_with_redzone, KASAN_GENERIC_REDZONE); 1149 } 1150 } 1151 1152 void 1153 __asan_unregister_globals(struct __asan_global *globals, size_t n) 1154 { 1155 /* never called */ 1156 } 1157 1158 #define ASAN_LOAD_STORE(size) \ 1159 void __asan_load##size(unsigned long); \ 1160 void __asan_load##size(unsigned long addr) \ 1161 { \ 1162 kasan_shadow_check(addr, size, false, __RET_ADDR);\ 1163 } \ 1164 void __asan_load##size##_noabort(unsigned long); \ 1165 void __asan_load##size##_noabort(unsigned long addr) \ 1166 { \ 1167 kasan_shadow_check(addr, size, false, __RET_ADDR);\ 1168 } \ 1169 void __asan_store##size(unsigned long); \ 1170 void __asan_store##size(unsigned long addr) \ 1171 { \ 1172 kasan_shadow_check(addr, size, true, __RET_ADDR);\ 1173 } \ 1174 void __asan_store##size##_noabort(unsigned long); \ 1175 void __asan_store##size##_noabort(unsigned long addr) \ 1176 { \ 1177 kasan_shadow_check(addr, size, true, __RET_ADDR);\ 1178 } 1179 1180 ASAN_LOAD_STORE(1); 1181 ASAN_LOAD_STORE(2); 1182 ASAN_LOAD_STORE(4); 1183 ASAN_LOAD_STORE(8); 1184 ASAN_LOAD_STORE(16); 1185 1186 void __asan_loadN(unsigned long, size_t); 1187 void __asan_loadN_noabort(unsigned long, size_t); 1188 void __asan_storeN(unsigned long, size_t); 1189 void __asan_storeN_noabort(unsigned long, size_t); 1190 void __asan_handle_no_return(void); 1191 1192 void 1193 __asan_loadN(unsigned long addr, size_t size) 1194 { 1195 kasan_shadow_check(addr, size, false, __RET_ADDR); 1196 } 1197 1198 void 1199 __asan_loadN_noabort(unsigned long addr, size_t size) 1200 { 1201 kasan_shadow_check(addr, size, false, __RET_ADDR); 1202 } 1203 1204 void 1205 __asan_storeN(unsigned long addr, size_t size) 1206 { 1207 kasan_shadow_check(addr, size, true, __RET_ADDR); 1208 } 1209 1210 void 1211 __asan_storeN_noabort(unsigned long addr, size_t size) 1212 { 1213 kasan_shadow_check(addr, size, true, __RET_ADDR); 1214 } 1215 1216 void 1217 __asan_handle_no_return(void) 1218 { 1219 /* nothing */ 1220 } 1221 1222 #define ASAN_SET_SHADOW(byte) \ 1223 void __asan_set_shadow_##byte(void *, size_t); \ 1224 void __asan_set_shadow_##byte(void *addr, size_t size) \ 1225 { \ 1226 __builtin_memset((void *)addr, 0x##byte, size); \ 1227 } 1228 1229 ASAN_SET_SHADOW(00); 1230 ASAN_SET_SHADOW(f1); 1231 ASAN_SET_SHADOW(f2); 1232 ASAN_SET_SHADOW(f3); 1233 ASAN_SET_SHADOW(f5); 1234 ASAN_SET_SHADOW(f8); 1235 1236 void __asan_poison_stack_memory(const void *, size_t); 1237 void __asan_unpoison_stack_memory(const void *, size_t); 1238 1239 void 1240 __asan_poison_stack_memory(const void *addr, size_t size) 1241 { 1242 size = roundup(size, KASAN_SHADOW_SCALE_SIZE); 1243 kasan_shadow_Nbyte_fill(addr, size, KASAN_USE_AFTER_SCOPE); 1244 } 1245 1246 void 1247 __asan_unpoison_stack_memory(const void *addr, size_t size) 1248 { 1249 kasan_shadow_Nbyte_markvalid(addr, size); 1250 } 1251 1252 void __asan_alloca_poison(const void *, size_t); 1253 void __asan_allocas_unpoison(const void *, const void *); 1254 1255 void __asan_alloca_poison(const void *addr, size_t size) 1256 { 1257 const void *l, *r; 1258 1259 KASSERT((vaddr_t)addr % KASAN_ALLOCA_SCALE_SIZE == 0); 1260 1261 l = (const uint8_t *)addr - KASAN_ALLOCA_SCALE_SIZE; 1262 r = (const uint8_t *)addr + roundup(size, KASAN_ALLOCA_SCALE_SIZE); 1263 1264 kasan_shadow_Nbyte_fill(l, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_LEFT); 1265 kasan_mark(addr, size, roundup(size, KASAN_ALLOCA_SCALE_SIZE), 1266 KASAN_STACK_MID); 1267 kasan_shadow_Nbyte_fill(r, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_RIGHT); 1268 } 1269 1270 void __asan_allocas_unpoison(const void *stkbegin, const void *stkend) 1271 { 1272 size_t size; 1273 1274 if (__predict_false(!stkbegin)) 1275 return; 1276 if (__predict_false((uintptr_t)stkbegin > (uintptr_t)stkend)) 1277 return; 1278 size = (uintptr_t)stkend - (uintptr_t)stkbegin; 1279 1280 kasan_shadow_Nbyte_fill(stkbegin, size, 0); 1281 } 1282
Indexes created Sat Sep 20 22:09:52 GMT 2025