subr_asan.c revision 1.11
1 /* $NetBSD: subr_asan.c,v 1.11 2019/09/05 16:19:16 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2018 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 1.11 2019/09/05 16:19:16 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 57 /* The MD code. */ 58 #include <machine/asan.h> 59 60 /* ASAN ABI version. */ 61 #if defined(__clang__) && (__clang_major__ - 0 >= 6) 62 #define ASAN_ABI_VERSION 8 63 #elif __GNUC_PREREQ__(7, 1) && !defined(__clang__) 64 #define ASAN_ABI_VERSION 8 65 #elif __GNUC_PREREQ__(6, 1) && !defined(__clang__) 66 #define ASAN_ABI_VERSION 6 67 #else 68 #error "Unsupported compiler version" 69 #endif 70 71 #define __RET_ADDR (unsigned long)__builtin_return_address(0) 72 73 /* Global variable descriptor. Part of the compiler ABI. */ 74 struct __asan_global_source_location { 75 const char *filename; 76 int line_no; 77 int column_no; 78 }; 79 struct __asan_global { 80 const void *beg; /* address of the global variable */ 81 size_t size; /* size of the global variable */ 82 size_t size_with_redzone; /* size with the redzone */ 83 const void *name; /* name of the variable */ 84 const void *module_name; /* name of the module where the var is declared */ 85 unsigned long has_dynamic_init; /* the var has dyn initializer (c++) */ 86 struct __asan_global_source_location *location; 87 #if ASAN_ABI_VERSION >= 7 88 uintptr_t odr_indicator; /* the address of the ODR indicator symbol */ 89 #endif 90 }; 91 92 static bool kasan_enabled __read_mostly = false; 93 94 /* -------------------------------------------------------------------------- */ 95 96 void 97 kasan_shadow_map(void *addr, size_t size) 98 { 99 size_t sz, npages, i; 100 vaddr_t sva, eva; 101 102 KASSERT((vaddr_t)addr % KASAN_SHADOW_SCALE_SIZE == 0); 103 104 sz = roundup(size, KASAN_SHADOW_SCALE_SIZE) / KASAN_SHADOW_SCALE_SIZE; 105 106 sva = (vaddr_t)kasan_md_addr_to_shad(addr); 107 eva = (vaddr_t)kasan_md_addr_to_shad(addr) + sz; 108 109 sva = rounddown(sva, PAGE_SIZE); 110 eva = roundup(eva, PAGE_SIZE); 111 112 npages = (eva - sva) / PAGE_SIZE; 113 114 KASSERT(sva >= KASAN_MD_SHADOW_START && eva < KASAN_MD_SHADOW_END); 115 116 for (i = 0; i < npages; i++) { 117 kasan_md_shadow_map_page(sva + i * PAGE_SIZE); 118 } 119 } 120 121 static void 122 kasan_ctors(void) 123 { 124 extern uint64_t __CTOR_LIST__, __CTOR_END__; 125 size_t nentries, i; 126 uint64_t *ptr; 127 128 nentries = ((size_t)&__CTOR_END__ - (size_t)&__CTOR_LIST__) / 129 sizeof(uintptr_t); 130 131 ptr = &__CTOR_LIST__; 132 for (i = 0; i < nentries; i++) { 133 void (*func)(void); 134 135 func = (void *)(*ptr); 136 (*func)(); 137 138 ptr++; 139 } 140 } 141 142 void 143 kasan_early_init(void *stack) 144 { 145 kasan_md_early_init(stack); 146 } 147 148 void 149 kasan_init(void) 150 { 151 /* MD initialization. */ 152 kasan_md_init(); 153 154 /* Now officially enabled. */ 155 kasan_enabled = true; 156 157 /* Call the ASAN constructors. */ 158 kasan_ctors(); 159 } 160 161 static inline const char * 162 kasan_code_name(uint8_t code) 163 { 164 switch (code) { 165 case KASAN_GENERIC_REDZONE: 166 return "GenericRedZone"; 167 case KASAN_MALLOC_REDZONE: 168 return "MallocRedZone"; 169 case KASAN_KMEM_REDZONE: 170 return "KmemRedZone"; 171 case KASAN_POOL_REDZONE: 172 return "PoolRedZone"; 173 case KASAN_POOL_FREED: 174 return "PoolUseAfterFree"; 175 case 1 ... 7: 176 return "RedZonePartial"; 177 case KASAN_STACK_LEFT: 178 return "StackLeft"; 179 case KASAN_STACK_RIGHT: 180 return "StackRight"; 181 case KASAN_STACK_PARTIAL: 182 return "StackPartial"; 183 case KASAN_USE_AFTER_SCOPE: 184 return "UseAfterScope"; 185 default: 186 return "Unknown"; 187 } 188 } 189 190 static void 191 kasan_report(unsigned long addr, size_t size, bool write, unsigned long pc, 192 uint8_t code) 193 { 194 REPORT("ASan: Unauthorized Access In %p: Addr %p [%zu byte%s, %s," 195 " %s]\n", 196 (void *)pc, (void *)addr, size, (size > 1 ? "s" : ""), 197 (write ? "write" : "read"), kasan_code_name(code)); 198 kasan_md_unwind(); 199 } 200 201 static __always_inline void 202 kasan_shadow_1byte_markvalid(unsigned long addr) 203 { 204 int8_t *byte = kasan_md_addr_to_shad((void *)addr); 205 int8_t last = (addr & KASAN_SHADOW_MASK) + 1; 206 207 *byte = last; 208 } 209 210 static __always_inline void 211 kasan_shadow_Nbyte_markvalid(const void *addr, size_t size) 212 { 213 size_t i; 214 215 for (i = 0; i < size; i++) { 216 kasan_shadow_1byte_markvalid((unsigned long)addr+i); 217 } 218 } 219 220 static __always_inline void 221 kasan_shadow_Nbyte_fill(const void *addr, size_t size, uint8_t code) 222 { 223 void *shad; 224 225 if (__predict_false(size == 0)) 226 return; 227 if (__predict_false(kasan_md_unsupported((vaddr_t)addr))) 228 return; 229 230 KASSERT((vaddr_t)addr % KASAN_SHADOW_SCALE_SIZE == 0); 231 KASSERT(size % KASAN_SHADOW_SCALE_SIZE == 0); 232 233 shad = (void *)kasan_md_addr_to_shad(addr); 234 size = size >> KASAN_SHADOW_SCALE_SHIFT; 235 236 __builtin_memset(shad, code, size); 237 } 238 239 void 240 kasan_add_redzone(size_t *size) 241 { 242 *size = roundup(*size, KASAN_SHADOW_SCALE_SIZE); 243 *size += KASAN_SHADOW_SCALE_SIZE; 244 } 245 246 void 247 kasan_softint(struct lwp *l) 248 { 249 const void *stk = (const void *)uvm_lwp_getuarea(l); 250 251 kasan_shadow_Nbyte_fill(stk, USPACE, 0); 252 } 253 254 /* 255 * In an area of size 'sz_with_redz', mark the 'size' first bytes as valid, 256 * and the rest as invalid. There are generally two use cases: 257 * 258 * o kasan_mark(addr, origsize, size, code), with origsize < size. This marks 259 * the redzone at the end of the buffer as invalid. 260 * 261 * o kasan_mark(addr, size, size, 0). This marks the entire buffer as valid. 262 */ 263 void 264 kasan_mark(const void *addr, size_t size, size_t sz_with_redz, uint8_t code) 265 { 266 size_t i, n, redz; 267 int8_t *shad; 268 269 KASSERT((vaddr_t)addr % KASAN_SHADOW_SCALE_SIZE == 0); 270 redz = sz_with_redz - roundup(size, KASAN_SHADOW_SCALE_SIZE); 271 KASSERT(redz % KASAN_SHADOW_SCALE_SIZE == 0); 272 shad = kasan_md_addr_to_shad(addr); 273 274 /* Chunks of 8 bytes, valid. */ 275 n = size / KASAN_SHADOW_SCALE_SIZE; 276 for (i = 0; i < n; i++) { 277 *shad++ = 0; 278 } 279 280 /* Possibly one chunk, mid. */ 281 if ((size & KASAN_SHADOW_MASK) != 0) { 282 *shad++ = (size & KASAN_SHADOW_MASK); 283 } 284 285 /* Chunks of 8 bytes, invalid. */ 286 n = redz / KASAN_SHADOW_SCALE_SIZE; 287 for (i = 0; i < n; i++) { 288 *shad++ = code; 289 } 290 } 291 292 /* -------------------------------------------------------------------------- */ 293 294 #define ADDR_CROSSES_SCALE_BOUNDARY(addr, size) \ 295 (addr >> KASAN_SHADOW_SCALE_SHIFT) != \ 296 ((addr + size - 1) >> KASAN_SHADOW_SCALE_SHIFT) 297 298 static __always_inline bool 299 kasan_shadow_1byte_isvalid(unsigned long addr, uint8_t *code) 300 { 301 int8_t *byte = kasan_md_addr_to_shad((void *)addr); 302 int8_t last = (addr & KASAN_SHADOW_MASK) + 1; 303 304 if (__predict_true(*byte == 0 || last <= *byte)) { 305 return true; 306 } 307 *code = *byte; 308 return false; 309 } 310 311 static __always_inline bool 312 kasan_shadow_2byte_isvalid(unsigned long addr, uint8_t *code) 313 { 314 int8_t *byte, last; 315 316 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 2)) { 317 return (kasan_shadow_1byte_isvalid(addr, code) && 318 kasan_shadow_1byte_isvalid(addr+1, code)); 319 } 320 321 byte = kasan_md_addr_to_shad((void *)addr); 322 last = ((addr + 1) & KASAN_SHADOW_MASK) + 1; 323 324 if (__predict_true(*byte == 0 || last <= *byte)) { 325 return true; 326 } 327 *code = *byte; 328 return false; 329 } 330 331 static __always_inline bool 332 kasan_shadow_4byte_isvalid(unsigned long addr, uint8_t *code) 333 { 334 int8_t *byte, last; 335 336 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 4)) { 337 return (kasan_shadow_2byte_isvalid(addr, code) && 338 kasan_shadow_2byte_isvalid(addr+2, code)); 339 } 340 341 byte = kasan_md_addr_to_shad((void *)addr); 342 last = ((addr + 3) & KASAN_SHADOW_MASK) + 1; 343 344 if (__predict_true(*byte == 0 || last <= *byte)) { 345 return true; 346 } 347 *code = *byte; 348 return false; 349 } 350 351 static __always_inline bool 352 kasan_shadow_8byte_isvalid(unsigned long addr, uint8_t *code) 353 { 354 int8_t *byte, last; 355 356 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 8)) { 357 return (kasan_shadow_4byte_isvalid(addr, code) && 358 kasan_shadow_4byte_isvalid(addr+4, code)); 359 } 360 361 byte = kasan_md_addr_to_shad((void *)addr); 362 last = ((addr + 7) & KASAN_SHADOW_MASK) + 1; 363 364 if (__predict_true(*byte == 0 || last <= *byte)) { 365 return true; 366 } 367 *code = *byte; 368 return false; 369 } 370 371 static __always_inline bool 372 kasan_shadow_Nbyte_isvalid(unsigned long addr, size_t size, uint8_t *code) 373 { 374 size_t i; 375 376 for (i = 0; i < size; i++) { 377 if (!kasan_shadow_1byte_isvalid(addr+i, code)) 378 return false; 379 } 380 381 return true; 382 } 383 384 static __always_inline void 385 kasan_shadow_check(unsigned long addr, size_t size, bool write, 386 unsigned long retaddr) 387 { 388 uint8_t code; 389 bool valid; 390 391 if (__predict_false(!kasan_enabled)) 392 return; 393 if (__predict_false(size == 0)) 394 return; 395 if (__predict_false(kasan_md_unsupported(addr))) 396 return; 397 398 if (__builtin_constant_p(size)) { 399 switch (size) { 400 case 1: 401 valid = kasan_shadow_1byte_isvalid(addr, &code); 402 break; 403 case 2: 404 valid = kasan_shadow_2byte_isvalid(addr, &code); 405 break; 406 case 4: 407 valid = kasan_shadow_4byte_isvalid(addr, &code); 408 break; 409 case 8: 410 valid = kasan_shadow_8byte_isvalid(addr, &code); 411 break; 412 default: 413 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code); 414 break; 415 } 416 } else { 417 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code); 418 } 419 420 if (__predict_false(!valid)) { 421 kasan_report(addr, size, write, retaddr, code); 422 } 423 } 424 425 /* -------------------------------------------------------------------------- */ 426 427 void * 428 kasan_memcpy(void *dst, const void *src, size_t len) 429 { 430 kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR); 431 kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR); 432 return __builtin_memcpy(dst, src, len); 433 } 434 435 int 436 kasan_memcmp(const void *b1, const void *b2, size_t len) 437 { 438 kasan_shadow_check((unsigned long)b1, len, false, __RET_ADDR); 439 kasan_shadow_check((unsigned long)b2, len, false, __RET_ADDR); 440 return __builtin_memcmp(b1, b2, len); 441 } 442 443 void * 444 kasan_memset(void *b, int c, size_t len) 445 { 446 kasan_shadow_check((unsigned long)b, len, true, __RET_ADDR); 447 return __builtin_memset(b, c, len); 448 } 449 450 char * 451 kasan_strcpy(char *dst, const char *src) 452 { 453 char *save = dst; 454 455 while (1) { 456 kasan_shadow_check((unsigned long)src, 1, false, __RET_ADDR); 457 kasan_shadow_check((unsigned long)dst, 1, true, __RET_ADDR); 458 *dst = *src; 459 if (*src == '\0') 460 break; 461 src++, dst++; 462 } 463 464 return save; 465 } 466 467 int 468 kasan_strcmp(const char *s1, const char *s2) 469 { 470 while (1) { 471 kasan_shadow_check((unsigned long)s1, 1, false, __RET_ADDR); 472 kasan_shadow_check((unsigned long)s2, 1, false, __RET_ADDR); 473 if (*s1 != *s2) 474 break; 475 if (*s1 == '\0') 476 return 0; 477 s1++, s2++; 478 } 479 480 return (*(const unsigned char *)s1 - *(const unsigned char *)s2); 481 } 482 483 size_t 484 kasan_strlen(const char *str) 485 { 486 const char *s; 487 488 s = str; 489 while (1) { 490 kasan_shadow_check((unsigned long)s, 1, false, __RET_ADDR); 491 if (*s == '\0') 492 break; 493 s++; 494 } 495 496 return (s - str); 497 } 498 499 #undef kcopy 500 #undef copystr 501 #undef copyinstr 502 #undef copyoutstr 503 #undef copyin 504 505 int kasan_kcopy(const void *, void *, size_t); 506 int kasan_copystr(const void *, void *, size_t, size_t *); 507 int kasan_copyinstr(const void *, void *, size_t, size_t *); 508 int kasan_copyoutstr(const void *, void *, size_t, size_t *); 509 int kasan_copyin(const void *, void *, size_t); 510 int kcopy(const void *, void *, size_t); 511 int copystr(const void *, void *, size_t, size_t *); 512 int copyinstr(const void *, void *, size_t, size_t *); 513 int copyoutstr(const void *, void *, size_t, size_t *); 514 int copyin(const void *, void *, size_t); 515 516 int 517 kasan_kcopy(const void *src, void *dst, size_t len) 518 { 519 kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR); 520 kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR); 521 return kcopy(src, dst, len); 522 } 523 524 int 525 kasan_copystr(const void *kfaddr, void *kdaddr, size_t len, size_t *done) 526 { 527 kasan_shadow_check((unsigned long)kdaddr, len, true, __RET_ADDR); 528 return copystr(kfaddr, kdaddr, len, done); 529 } 530 531 int 532 kasan_copyin(const void *uaddr, void *kaddr, size_t len) 533 { 534 kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR); 535 return copyin(uaddr, kaddr, len); 536 } 537 538 int 539 kasan_copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done) 540 { 541 kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR); 542 return copyinstr(uaddr, kaddr, len, done); 543 } 544 545 int 546 kasan_copyoutstr(const void *kaddr, void *uaddr, size_t len, size_t *done) 547 { 548 kasan_shadow_check((unsigned long)kaddr, len, false, __RET_ADDR); 549 return copyoutstr(kaddr, uaddr, len, done); 550 } 551 552 /* -------------------------------------------------------------------------- */ 553 554 #undef atomic_add_32 555 #undef atomic_add_int 556 #undef atomic_add_long 557 #undef atomic_add_ptr 558 #undef atomic_add_64 559 #undef atomic_add_32_nv 560 #undef atomic_add_int_nv 561 #undef atomic_add_long_nv 562 #undef atomic_add_ptr_nv 563 #undef atomic_add_64_nv 564 #undef atomic_and_32 565 #undef atomic_and_uint 566 #undef atomic_and_ulong 567 #undef atomic_and_64 568 #undef atomic_and_32_nv 569 #undef atomic_and_uint_nv 570 #undef atomic_and_ulong_nv 571 #undef atomic_and_64_nv 572 #undef atomic_or_32 573 #undef atomic_or_uint 574 #undef atomic_or_ulong 575 #undef atomic_or_64 576 #undef atomic_or_32_nv 577 #undef atomic_or_uint_nv 578 #undef atomic_or_ulong_nv 579 #undef atomic_or_64_nv 580 #undef atomic_cas_32 581 #undef atomic_cas_uint 582 #undef atomic_cas_ulong 583 #undef atomic_cas_ptr 584 #undef atomic_cas_64 585 #undef atomic_cas_32_ni 586 #undef atomic_cas_uint_ni 587 #undef atomic_cas_ulong_ni 588 #undef atomic_cas_ptr_ni 589 #undef atomic_cas_64_ni 590 #undef atomic_swap_32 591 #undef atomic_swap_uint 592 #undef atomic_swap_ulong 593 #undef atomic_swap_ptr 594 #undef atomic_swap_64 595 #undef atomic_dec_32 596 #undef atomic_dec_uint 597 #undef atomic_dec_ulong 598 #undef atomic_dec_ptr 599 #undef atomic_dec_64 600 #undef atomic_dec_32_nv 601 #undef atomic_dec_uint_nv 602 #undef atomic_dec_ulong_nv 603 #undef atomic_dec_ptr_nv 604 #undef atomic_dec_64_nv 605 #undef atomic_inc_32 606 #undef atomic_inc_uint 607 #undef atomic_inc_ulong 608 #undef atomic_inc_ptr 609 #undef atomic_inc_64 610 #undef atomic_inc_32_nv 611 #undef atomic_inc_uint_nv 612 #undef atomic_inc_ulong_nv 613 #undef atomic_inc_ptr_nv 614 #undef atomic_inc_64_nv 615 616 #define ASAN_ATOMIC_FUNC_ADD(name, tret, targ1, targ2) \ 617 void atomic_add_##name(volatile targ1 *, targ2); \ 618 void kasan_atomic_add_##name(volatile targ1 *, targ2); \ 619 void kasan_atomic_add_##name(volatile targ1 *ptr, targ2 val) \ 620 { \ 621 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 622 __RET_ADDR); \ 623 atomic_add_##name(ptr, val); \ 624 } \ 625 tret atomic_add_##name##_nv(volatile targ1 *, targ2); \ 626 tret kasan_atomic_add_##name##_nv(volatile targ1 *, targ2); \ 627 tret kasan_atomic_add_##name##_nv(volatile targ1 *ptr, targ2 val) \ 628 { \ 629 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 630 __RET_ADDR); \ 631 return atomic_add_##name##_nv(ptr, val); \ 632 } 633 634 #define ASAN_ATOMIC_FUNC_AND(name, tret, targ1, targ2) \ 635 void atomic_and_##name(volatile targ1 *, targ2); \ 636 void kasan_atomic_and_##name(volatile targ1 *, targ2); \ 637 void kasan_atomic_and_##name(volatile targ1 *ptr, targ2 val) \ 638 { \ 639 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 640 __RET_ADDR); \ 641 atomic_and_##name(ptr, val); \ 642 } \ 643 tret atomic_and_##name##_nv(volatile targ1 *, targ2); \ 644 tret kasan_atomic_and_##name##_nv(volatile targ1 *, targ2); \ 645 tret kasan_atomic_and_##name##_nv(volatile targ1 *ptr, targ2 val) \ 646 { \ 647 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 648 __RET_ADDR); \ 649 return atomic_and_##name##_nv(ptr, val); \ 650 } 651 652 #define ASAN_ATOMIC_FUNC_OR(name, tret, targ1, targ2) \ 653 void atomic_or_##name(volatile targ1 *, targ2); \ 654 void kasan_atomic_or_##name(volatile targ1 *, targ2); \ 655 void kasan_atomic_or_##name(volatile targ1 *ptr, targ2 val) \ 656 { \ 657 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 658 __RET_ADDR); \ 659 atomic_or_##name(ptr, val); \ 660 } \ 661 tret atomic_or_##name##_nv(volatile targ1 *, targ2); \ 662 tret kasan_atomic_or_##name##_nv(volatile targ1 *, targ2); \ 663 tret kasan_atomic_or_##name##_nv(volatile targ1 *ptr, targ2 val) \ 664 { \ 665 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 666 __RET_ADDR); \ 667 return atomic_or_##name##_nv(ptr, val); \ 668 } 669 670 #define ASAN_ATOMIC_FUNC_CAS(name, tret, targ1, targ2) \ 671 tret atomic_cas_##name(volatile targ1 *, targ2, targ2); \ 672 tret kasan_atomic_cas_##name(volatile targ1 *, targ2, targ2); \ 673 tret kasan_atomic_cas_##name(volatile targ1 *ptr, targ2 exp, targ2 new) \ 674 { \ 675 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 676 __RET_ADDR); \ 677 return atomic_cas_##name(ptr, exp, new); \ 678 } \ 679 tret atomic_cas_##name##_ni(volatile targ1 *, targ2, targ2); \ 680 tret kasan_atomic_cas_##name##_ni(volatile targ1 *, targ2, targ2); \ 681 tret kasan_atomic_cas_##name##_ni(volatile targ1 *ptr, targ2 exp, targ2 new) \ 682 { \ 683 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 684 __RET_ADDR); \ 685 return atomic_cas_##name##_ni(ptr, exp, new); \ 686 } 687 688 #define ASAN_ATOMIC_FUNC_SWAP(name, tret, targ1, targ2) \ 689 tret atomic_swap_##name(volatile targ1 *, targ2); \ 690 tret kasan_atomic_swap_##name(volatile targ1 *, targ2); \ 691 tret kasan_atomic_swap_##name(volatile targ1 *ptr, targ2 val) \ 692 { \ 693 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 694 __RET_ADDR); \ 695 return atomic_swap_##name(ptr, val); \ 696 } 697 698 #define ASAN_ATOMIC_FUNC_DEC(name, tret, targ1) \ 699 void atomic_dec_##name(volatile targ1 *); \ 700 void kasan_atomic_dec_##name(volatile targ1 *); \ 701 void kasan_atomic_dec_##name(volatile targ1 *ptr) \ 702 { \ 703 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 704 __RET_ADDR); \ 705 atomic_dec_##name(ptr); \ 706 } \ 707 tret atomic_dec_##name##_nv(volatile targ1 *); \ 708 tret kasan_atomic_dec_##name##_nv(volatile targ1 *); \ 709 tret kasan_atomic_dec_##name##_nv(volatile targ1 *ptr) \ 710 { \ 711 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 712 __RET_ADDR); \ 713 return atomic_dec_##name##_nv(ptr); \ 714 } 715 716 #define ASAN_ATOMIC_FUNC_INC(name, tret, targ1) \ 717 void atomic_inc_##name(volatile targ1 *); \ 718 void kasan_atomic_inc_##name(volatile targ1 *); \ 719 void kasan_atomic_inc_##name(volatile targ1 *ptr) \ 720 { \ 721 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 722 __RET_ADDR); \ 723 atomic_inc_##name(ptr); \ 724 } \ 725 tret atomic_inc_##name##_nv(volatile targ1 *); \ 726 tret kasan_atomic_inc_##name##_nv(volatile targ1 *); \ 727 tret kasan_atomic_inc_##name##_nv(volatile targ1 *ptr) \ 728 { \ 729 kasan_shadow_check((uintptr_t)ptr, sizeof(tret), true, \ 730 __RET_ADDR); \ 731 return atomic_inc_##name##_nv(ptr); \ 732 } 733 734 ASAN_ATOMIC_FUNC_ADD(32, uint32_t, uint32_t, int32_t); 735 ASAN_ATOMIC_FUNC_ADD(64, uint64_t, uint64_t, int64_t); 736 ASAN_ATOMIC_FUNC_ADD(int, unsigned int, unsigned int, int); 737 ASAN_ATOMIC_FUNC_ADD(long, unsigned long, unsigned long, long); 738 ASAN_ATOMIC_FUNC_ADD(ptr, void *, void, ssize_t); 739 740 ASAN_ATOMIC_FUNC_AND(32, uint32_t, uint32_t, uint32_t); 741 ASAN_ATOMIC_FUNC_AND(64, uint64_t, uint64_t, uint64_t); 742 ASAN_ATOMIC_FUNC_AND(uint, unsigned int, unsigned int, unsigned int); 743 ASAN_ATOMIC_FUNC_AND(ulong, unsigned long, unsigned long, unsigned long); 744 745 ASAN_ATOMIC_FUNC_OR(32, uint32_t, uint32_t, uint32_t); 746 ASAN_ATOMIC_FUNC_OR(64, uint64_t, uint64_t, uint64_t); 747 ASAN_ATOMIC_FUNC_OR(uint, unsigned int, unsigned int, unsigned int); 748 ASAN_ATOMIC_FUNC_OR(ulong, unsigned long, unsigned long, unsigned long); 749 750 ASAN_ATOMIC_FUNC_CAS(32, uint32_t, uint32_t, uint32_t); 751 ASAN_ATOMIC_FUNC_CAS(64, uint64_t, uint64_t, uint64_t); 752 ASAN_ATOMIC_FUNC_CAS(uint, unsigned int, unsigned int, unsigned int); 753 ASAN_ATOMIC_FUNC_CAS(ulong, unsigned long, unsigned long, unsigned long); 754 ASAN_ATOMIC_FUNC_CAS(ptr, void *, void, void *); 755 756 ASAN_ATOMIC_FUNC_SWAP(32, uint32_t, uint32_t, uint32_t); 757 ASAN_ATOMIC_FUNC_SWAP(64, uint64_t, uint64_t, uint64_t); 758 ASAN_ATOMIC_FUNC_SWAP(uint, unsigned int, unsigned int, unsigned int); 759 ASAN_ATOMIC_FUNC_SWAP(ulong, unsigned long, unsigned long, unsigned long); 760 ASAN_ATOMIC_FUNC_SWAP(ptr, void *, void, void *); 761 762 ASAN_ATOMIC_FUNC_DEC(32, uint32_t, uint32_t) 763 ASAN_ATOMIC_FUNC_DEC(64, uint64_t, uint64_t) 764 ASAN_ATOMIC_FUNC_DEC(uint, unsigned int, unsigned int); 765 ASAN_ATOMIC_FUNC_DEC(ulong, unsigned long, unsigned long); 766 ASAN_ATOMIC_FUNC_DEC(ptr, void *, void); 767 768 ASAN_ATOMIC_FUNC_INC(32, uint32_t, uint32_t) 769 ASAN_ATOMIC_FUNC_INC(64, uint64_t, uint64_t) 770 ASAN_ATOMIC_FUNC_INC(uint, unsigned int, unsigned int); 771 ASAN_ATOMIC_FUNC_INC(ulong, unsigned long, unsigned long); 772 ASAN_ATOMIC_FUNC_INC(ptr, void *, void); 773 774 /* -------------------------------------------------------------------------- */ 775 776 void __asan_register_globals(struct __asan_global *, size_t); 777 void __asan_unregister_globals(struct __asan_global *, size_t); 778 779 void 780 __asan_register_globals(struct __asan_global *globals, size_t n) 781 { 782 size_t i; 783 784 for (i = 0; i < n; i++) { 785 kasan_mark(globals[i].beg, globals[i].size, 786 globals[i].size_with_redzone, KASAN_GENERIC_REDZONE); 787 } 788 } 789 790 void 791 __asan_unregister_globals(struct __asan_global *globals, size_t n) 792 { 793 /* never called */ 794 } 795 796 #define ASAN_LOAD_STORE(size) \ 797 void __asan_load##size(unsigned long); \ 798 void __asan_load##size(unsigned long addr) \ 799 { \ 800 kasan_shadow_check(addr, size, false, __RET_ADDR);\ 801 } \ 802 void __asan_load##size##_noabort(unsigned long); \ 803 void __asan_load##size##_noabort(unsigned long addr) \ 804 { \ 805 kasan_shadow_check(addr, size, false, __RET_ADDR);\ 806 } \ 807 void __asan_store##size(unsigned long); \ 808 void __asan_store##size(unsigned long addr) \ 809 { \ 810 kasan_shadow_check(addr, size, true, __RET_ADDR);\ 811 } \ 812 void __asan_store##size##_noabort(unsigned long); \ 813 void __asan_store##size##_noabort(unsigned long addr) \ 814 { \ 815 kasan_shadow_check(addr, size, true, __RET_ADDR);\ 816 } 817 818 ASAN_LOAD_STORE(1); 819 ASAN_LOAD_STORE(2); 820 ASAN_LOAD_STORE(4); 821 ASAN_LOAD_STORE(8); 822 ASAN_LOAD_STORE(16); 823 824 void __asan_loadN(unsigned long, size_t); 825 void __asan_loadN_noabort(unsigned long, size_t); 826 void __asan_storeN(unsigned long, size_t); 827 void __asan_storeN_noabort(unsigned long, size_t); 828 void __asan_handle_no_return(void); 829 830 void 831 __asan_loadN(unsigned long addr, size_t size) 832 { 833 kasan_shadow_check(addr, size, false, __RET_ADDR); 834 } 835 836 void 837 __asan_loadN_noabort(unsigned long addr, size_t size) 838 { 839 kasan_shadow_check(addr, size, false, __RET_ADDR); 840 } 841 842 void 843 __asan_storeN(unsigned long addr, size_t size) 844 { 845 kasan_shadow_check(addr, size, true, __RET_ADDR); 846 } 847 848 void 849 __asan_storeN_noabort(unsigned long addr, size_t size) 850 { 851 kasan_shadow_check(addr, size, true, __RET_ADDR); 852 } 853 854 void 855 __asan_handle_no_return(void) 856 { 857 /* nothing */ 858 } 859 860 #define ASAN_SET_SHADOW(byte) \ 861 void __asan_set_shadow_##byte(void *, size_t); \ 862 void __asan_set_shadow_##byte(void *addr, size_t size) \ 863 { \ 864 __builtin_memset((void *)addr, 0x##byte, size); \ 865 } 866 867 ASAN_SET_SHADOW(00); 868 ASAN_SET_SHADOW(f1); 869 ASAN_SET_SHADOW(f2); 870 ASAN_SET_SHADOW(f3); 871 ASAN_SET_SHADOW(f5); 872 ASAN_SET_SHADOW(f8); 873 874 void __asan_poison_stack_memory(const void *, size_t); 875 void __asan_unpoison_stack_memory(const void *, size_t); 876 877 void __asan_poison_stack_memory(const void *addr, size_t size) 878 { 879 size = roundup(size, KASAN_SHADOW_SCALE_SIZE); 880 kasan_shadow_Nbyte_fill(addr, size, KASAN_USE_AFTER_SCOPE); 881 } 882 883 void __asan_unpoison_stack_memory(const void *addr, size_t size) 884 { 885 kasan_shadow_Nbyte_markvalid(addr, size); 886 } 887
Indexes created Sat Sep 20 22:09:52 GMT 2025