1 /* $NetBSD: subr_asan.c,v 1.26 2020/09/10 14:10:46 maxv Exp $ */
4 * Copyright (c) 2018-2020 Maxime Villard, m00nbsd.net
7 * This code is part of the KASAN subsystem of the NetBSD kernel.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 __KERNEL_RCSID(0, "$NetBSD: subr_asan.c,v 1.26 2020/09/10 14:10:46 maxv Exp $");
39 #include <sys/param.h>
40 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/stack.h>
44 #include <sys/sysctl.h>
46 #include <machine/asan.h>
48 /* ASAN constants. Part of the compiler ABI. */
49 #define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE - 1)
50 #define KASAN_ALLOCA_SCALE_SIZE 32
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
60 #error "Unsupported compiler version"
63 #define __RET_ADDR (unsigned long)__builtin_return_address(0)
65 /* Global variable descriptor. Part of the compiler ABI. */
66 struct __asan_global_source_location {
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 */
85 FEATURE(kasan, "Kernel address sanitizer");
87 static SYSCTL_NODE(_debug, OID_AUTO, kasan, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
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");
95 static bool kasan_enabled __read_mostly = false;
97 /* -------------------------------------------------------------------------- */
100 kasan_shadow_map(vm_offset_t addr, size_t size)
102 size_t sz, npages, i;
103 vm_offset_t sva, eva;
105 KASSERT(addr % KASAN_SHADOW_SCALE == 0,
106 ("%s: invalid address %#lx", __func__, addr));
108 sz = roundup(size, KASAN_SHADOW_SCALE) / KASAN_SHADOW_SCALE;
110 sva = kasan_md_addr_to_shad(addr);
111 eva = kasan_md_addr_to_shad(addr) + sz;
113 sva = rounddown(sva, PAGE_SIZE);
114 eva = roundup(eva, PAGE_SIZE);
116 npages = (eva - sva) / PAGE_SIZE;
118 KASSERT(sva >= KASAN_MIN_ADDRESS && eva < KASAN_MAX_ADDRESS,
119 ("%s: invalid address range %#lx-%#lx", __func__, sva, eva));
121 for (i = 0; i < npages; i++)
122 pmap_kasan_enter(sva + ptoa(i));
131 TUNABLE_INT_FETCH("debug.kasan.disabled", &disabled);
135 /* MD initialization. */
138 /* Now officially enabled. */
139 kasan_enabled = true;
142 static inline const char *
143 kasan_code_name(uint8_t 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:
159 return "RedZonePartial";
160 case KASAN_STACK_LEFT:
162 case KASAN_STACK_MID:
163 return "StackMiddle";
164 case KASAN_STACK_RIGHT:
166 case KASAN_USE_AFTER_RET:
167 return "UseAfterRet";
168 case KASAN_USE_AFTER_SCOPE:
169 return "UseAfterScope";
175 #define REPORT(f, ...) do { \
176 if (panic_on_violation) { \
177 panic(f, __VA_ARGS__); \
182 printf(f "\n", __VA_ARGS__); \
183 stack_print_ddb(&st); \
188 kasan_report(unsigned long addr, size_t size, bool write, unsigned long pc,
191 REPORT("ASan: Invalid access, %zu-byte %s at %#lx, %s(%x)",
192 size, (write ? "write" : "read"), addr, kasan_code_name(code),
196 static __always_inline void
197 kasan_shadow_1byte_markvalid(unsigned long addr)
199 int8_t *byte = (int8_t *)kasan_md_addr_to_shad(addr);
200 int8_t last = (addr & KASAN_SHADOW_MASK) + 1;
205 static __always_inline void
206 kasan_shadow_Nbyte_markvalid(const void *addr, size_t size)
210 for (i = 0; i < size; i++) {
211 kasan_shadow_1byte_markvalid((unsigned long)addr + i);
215 static __always_inline void
216 kasan_shadow_Nbyte_fill(const void *addr, size_t size, uint8_t code)
220 if (__predict_false(size == 0))
222 if (__predict_false(kasan_md_unsupported((vm_offset_t)addr)))
225 KASSERT((vm_offset_t)addr % KASAN_SHADOW_SCALE == 0,
226 ("%s: invalid address %p", __func__, addr));
227 KASSERT(size % KASAN_SHADOW_SCALE == 0,
228 ("%s: invalid size %zu", __func__, size));
230 shad = (void *)kasan_md_addr_to_shad((uintptr_t)addr);
231 size = size >> KASAN_SHADOW_SCALE_SHIFT;
233 __builtin_memset(shad, code, size);
237 * In an area of size 'sz_with_redz', mark the 'size' first bytes as valid,
238 * and the rest as invalid. There are generally two use cases:
240 * o kasan_mark(addr, origsize, size, code), with origsize < size. This marks
241 * the redzone at the end of the buffer as invalid. If the entire is to be
242 * marked invalid, origsize will be 0.
244 * o kasan_mark(addr, size, size, 0). This marks the entire buffer as valid.
247 kasan_mark(const void *addr, size_t size, size_t redzsize, uint8_t code)
252 if ((vm_offset_t)addr >= DMAP_MIN_ADDRESS &&
253 (vm_offset_t)addr < DMAP_MAX_ADDRESS)
256 KASSERT((vm_offset_t)addr >= VM_MIN_KERNEL_ADDRESS &&
257 (vm_offset_t)addr < VM_MAX_KERNEL_ADDRESS,
258 ("%s: invalid address %p", __func__, addr));
259 KASSERT((vm_offset_t)addr % KASAN_SHADOW_SCALE == 0,
260 ("%s: invalid address %p", __func__, addr));
261 redz = redzsize - roundup(size, KASAN_SHADOW_SCALE);
262 KASSERT(redz % KASAN_SHADOW_SCALE == 0,
263 ("%s: invalid size %zu", __func__, redz));
264 shad = (int8_t *)kasan_md_addr_to_shad((uintptr_t)addr);
266 /* Chunks of 8 bytes, valid. */
267 n = size / KASAN_SHADOW_SCALE;
268 for (i = 0; i < n; i++) {
272 /* Possibly one chunk, mid. */
273 if ((size & KASAN_SHADOW_MASK) != 0) {
274 *shad++ = (size & KASAN_SHADOW_MASK);
277 /* Chunks of 8 bytes, invalid. */
278 n = redz / KASAN_SHADOW_SCALE;
279 for (i = 0; i < n; i++) {
284 /* -------------------------------------------------------------------------- */
286 #define ADDR_CROSSES_SCALE_BOUNDARY(addr, size) \
287 (addr >> KASAN_SHADOW_SCALE_SHIFT) != \
288 ((addr + size - 1) >> KASAN_SHADOW_SCALE_SHIFT)
290 static __always_inline bool
291 kasan_shadow_1byte_isvalid(unsigned long addr, uint8_t *code)
293 int8_t *byte = (int8_t *)kasan_md_addr_to_shad(addr);
294 int8_t last = (addr & KASAN_SHADOW_MASK) + 1;
296 if (__predict_true(*byte == 0 || last <= *byte)) {
303 static __always_inline bool
304 kasan_shadow_2byte_isvalid(unsigned long addr, uint8_t *code)
308 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 2)) {
309 return (kasan_shadow_1byte_isvalid(addr, code) &&
310 kasan_shadow_1byte_isvalid(addr+1, code));
313 byte = (int8_t *)kasan_md_addr_to_shad(addr);
314 last = ((addr + 1) & KASAN_SHADOW_MASK) + 1;
316 if (__predict_true(*byte == 0 || last <= *byte)) {
323 static __always_inline bool
324 kasan_shadow_4byte_isvalid(unsigned long addr, uint8_t *code)
328 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 4)) {
329 return (kasan_shadow_2byte_isvalid(addr, code) &&
330 kasan_shadow_2byte_isvalid(addr+2, code));
333 byte = (int8_t *)kasan_md_addr_to_shad(addr);
334 last = ((addr + 3) & KASAN_SHADOW_MASK) + 1;
336 if (__predict_true(*byte == 0 || last <= *byte)) {
343 static __always_inline bool
344 kasan_shadow_8byte_isvalid(unsigned long addr, uint8_t *code)
348 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 8)) {
349 return (kasan_shadow_4byte_isvalid(addr, code) &&
350 kasan_shadow_4byte_isvalid(addr+4, code));
353 byte = (int8_t *)kasan_md_addr_to_shad(addr);
354 last = ((addr + 7) & KASAN_SHADOW_MASK) + 1;
356 if (__predict_true(*byte == 0 || last <= *byte)) {
363 static __always_inline bool
364 kasan_shadow_Nbyte_isvalid(unsigned long addr, size_t size, uint8_t *code)
368 for (i = 0; i < size; i++) {
369 if (!kasan_shadow_1byte_isvalid(addr+i, code))
376 static __always_inline void
377 kasan_shadow_check(unsigned long addr, size_t size, bool write,
378 unsigned long retaddr)
383 if (__predict_false(!kasan_enabled))
385 if (__predict_false(size == 0))
387 if (__predict_false(kasan_md_unsupported(addr)))
389 if (__predict_false(panicstr != NULL))
392 if (__builtin_constant_p(size)) {
395 valid = kasan_shadow_1byte_isvalid(addr, &code);
398 valid = kasan_shadow_2byte_isvalid(addr, &code);
401 valid = kasan_shadow_4byte_isvalid(addr, &code);
404 valid = kasan_shadow_8byte_isvalid(addr, &code);
407 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code);
411 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code);
414 if (__predict_false(!valid)) {
415 kasan_report(addr, size, write, retaddr, code);
419 /* -------------------------------------------------------------------------- */
422 kasan_memcpy(void *dst, const void *src, size_t len)
424 kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR);
425 kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR);
426 return (__builtin_memcpy(dst, src, len));
430 kasan_memcmp(const void *b1, const void *b2, size_t len)
432 kasan_shadow_check((unsigned long)b1, len, false, __RET_ADDR);
433 kasan_shadow_check((unsigned long)b2, len, false, __RET_ADDR);
434 return (__builtin_memcmp(b1, b2, len));
438 kasan_memset(void *b, int c, size_t len)
440 kasan_shadow_check((unsigned long)b, len, true, __RET_ADDR);
441 return (__builtin_memset(b, c, len));
445 kasan_memmove(void *dst, const void *src, size_t len)
447 kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR);
448 kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR);
449 return (__builtin_memmove(dst, src, len));
453 kasan_strlen(const char *str)
459 kasan_shadow_check((unsigned long)s, 1, false, __RET_ADDR);
469 kasan_strcpy(char *dst, const char *src)
474 kasan_shadow_check((unsigned long)src, 1, false, __RET_ADDR);
475 kasan_shadow_check((unsigned long)dst, 1, true, __RET_ADDR);
486 kasan_strcmp(const char *s1, const char *s2)
489 kasan_shadow_check((unsigned long)s1, 1, false, __RET_ADDR);
490 kasan_shadow_check((unsigned long)s2, 1, false, __RET_ADDR);
498 return (*(const unsigned char *)s1 - *(const unsigned char *)s2);
502 kasan_copyin(const void *uaddr, void *kaddr, size_t len)
504 kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR);
505 return (copyin(uaddr, kaddr, len));
509 kasan_copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done)
511 kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR);
512 return (copyinstr(uaddr, kaddr, len, done));
516 kasan_copyout(const void *kaddr, void *uaddr, size_t len)
518 kasan_shadow_check((unsigned long)kaddr, len, false, __RET_ADDR);
519 return (copyout(kaddr, uaddr, len));
522 /* -------------------------------------------------------------------------- */
524 #include <machine/atomic.h>
525 #define ATOMIC_SAN_PREFIX kasan
526 #include <sys/atomic_san.h>
528 #define _ASAN_ATOMIC_FUNC_ADD(name, type) \
529 void kasan_atomic_add_##name(volatile type *ptr, type val) \
531 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
533 atomic_add_##name(ptr, val); \
536 #define ASAN_ATOMIC_FUNC_ADD(name, type) \
537 _ASAN_ATOMIC_FUNC_ADD(name, type) \
538 _ASAN_ATOMIC_FUNC_ADD(acq_##name, type) \
539 _ASAN_ATOMIC_FUNC_ADD(rel_##name, type)
541 #define _ASAN_ATOMIC_FUNC_SUBTRACT(name, type) \
542 void kasan_atomic_subtract_##name(volatile type *ptr, type val) \
544 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
546 atomic_subtract_##name(ptr, val); \
549 #define ASAN_ATOMIC_FUNC_SUBTRACT(name, type) \
550 _ASAN_ATOMIC_FUNC_SUBTRACT(name, type) \
551 _ASAN_ATOMIC_FUNC_SUBTRACT(acq_##name, type) \
552 _ASAN_ATOMIC_FUNC_SUBTRACT(rel_##name, type)
554 #define _ASAN_ATOMIC_FUNC_SET(name, type) \
555 void kasan_atomic_set_##name(volatile type *ptr, type val) \
557 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
559 atomic_set_##name(ptr, val); \
562 #define ASAN_ATOMIC_FUNC_SET(name, type) \
563 _ASAN_ATOMIC_FUNC_SET(name, type) \
564 _ASAN_ATOMIC_FUNC_SET(acq_##name, type) \
565 _ASAN_ATOMIC_FUNC_SET(rel_##name, type)
567 #define _ASAN_ATOMIC_FUNC_CLEAR(name, type) \
568 void kasan_atomic_clear_##name(volatile type *ptr, type val) \
570 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
572 atomic_clear_##name(ptr, val); \
575 #define ASAN_ATOMIC_FUNC_CLEAR(name, type) \
576 _ASAN_ATOMIC_FUNC_CLEAR(name, type) \
577 _ASAN_ATOMIC_FUNC_CLEAR(acq_##name, type) \
578 _ASAN_ATOMIC_FUNC_CLEAR(rel_##name, type)
580 #define ASAN_ATOMIC_FUNC_FETCHADD(name, type) \
581 type kasan_atomic_fetchadd_##name(volatile type *ptr, type val) \
583 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
585 return (atomic_fetchadd_##name(ptr, val)); \
588 #define ASAN_ATOMIC_FUNC_READANDCLEAR(name, type) \
589 type kasan_atomic_readandclear_##name(volatile type *ptr) \
591 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
593 return (atomic_readandclear_##name(ptr)); \
596 #define ASAN_ATOMIC_FUNC_TESTANDCLEAR(name, type) \
597 int kasan_atomic_testandclear_##name(volatile type *ptr, u_int v) \
599 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
601 return (atomic_testandclear_##name(ptr, v)); \
604 #define ASAN_ATOMIC_FUNC_TESTANDSET(name, type) \
605 int kasan_atomic_testandset_##name(volatile type *ptr, u_int v) \
607 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
609 return (atomic_testandset_##name(ptr, v)); \
612 #define ASAN_ATOMIC_FUNC_SWAP(name, type) \
613 type kasan_atomic_swap_##name(volatile type *ptr, type val) \
615 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
617 return (atomic_swap_##name(ptr, val)); \
620 #define _ASAN_ATOMIC_FUNC_CMPSET(name, type) \
621 int kasan_atomic_cmpset_##name(volatile type *ptr, type oval, \
624 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
626 return (atomic_cmpset_##name(ptr, oval, nval)); \
629 #define ASAN_ATOMIC_FUNC_CMPSET(name, type) \
630 _ASAN_ATOMIC_FUNC_CMPSET(name, type) \
631 _ASAN_ATOMIC_FUNC_CMPSET(acq_##name, type) \
632 _ASAN_ATOMIC_FUNC_CMPSET(rel_##name, type)
634 #define _ASAN_ATOMIC_FUNC_FCMPSET(name, type) \
635 int kasan_atomic_fcmpset_##name(volatile type *ptr, type *oval, \
638 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
640 return (atomic_fcmpset_##name(ptr, oval, nval)); \
643 #define ASAN_ATOMIC_FUNC_FCMPSET(name, type) \
644 _ASAN_ATOMIC_FUNC_FCMPSET(name, type) \
645 _ASAN_ATOMIC_FUNC_FCMPSET(acq_##name, type) \
646 _ASAN_ATOMIC_FUNC_FCMPSET(rel_##name, type)
648 #define ASAN_ATOMIC_FUNC_THREAD_FENCE(name) \
649 void kasan_atomic_thread_fence_##name(void) \
651 atomic_thread_fence_##name(); \
654 #define _ASAN_ATOMIC_FUNC_LOAD(name, type) \
655 type kasan_atomic_load_##name(volatile type *ptr) \
657 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
659 return (atomic_load_##name(ptr)); \
662 #define ASAN_ATOMIC_FUNC_LOAD(name, type) \
663 _ASAN_ATOMIC_FUNC_LOAD(name, type) \
664 _ASAN_ATOMIC_FUNC_LOAD(acq_##name, type)
666 #define _ASAN_ATOMIC_FUNC_STORE(name, type) \
667 void kasan_atomic_store_##name(volatile type *ptr, type val) \
669 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
671 atomic_store_##name(ptr, val); \
674 #define ASAN_ATOMIC_FUNC_STORE(name, type) \
675 _ASAN_ATOMIC_FUNC_STORE(name, type) \
676 _ASAN_ATOMIC_FUNC_STORE(rel_##name, type)
678 ASAN_ATOMIC_FUNC_ADD(8, uint8_t);
679 ASAN_ATOMIC_FUNC_ADD(16, uint16_t);
680 ASAN_ATOMIC_FUNC_ADD(32, uint32_t);
681 ASAN_ATOMIC_FUNC_ADD(64, uint64_t);
682 ASAN_ATOMIC_FUNC_ADD(int, u_int);
683 ASAN_ATOMIC_FUNC_ADD(long, u_long);
684 ASAN_ATOMIC_FUNC_ADD(ptr, uintptr_t);
686 ASAN_ATOMIC_FUNC_SUBTRACT(8, uint8_t);
687 ASAN_ATOMIC_FUNC_SUBTRACT(16, uint16_t);
688 ASAN_ATOMIC_FUNC_SUBTRACT(32, uint32_t);
689 ASAN_ATOMIC_FUNC_SUBTRACT(64, uint64_t);
690 ASAN_ATOMIC_FUNC_SUBTRACT(int, u_int);
691 ASAN_ATOMIC_FUNC_SUBTRACT(long, u_long);
692 ASAN_ATOMIC_FUNC_SUBTRACT(ptr, uintptr_t);
694 ASAN_ATOMIC_FUNC_SET(8, uint8_t);
695 ASAN_ATOMIC_FUNC_SET(16, uint16_t);
696 ASAN_ATOMIC_FUNC_SET(32, uint32_t);
697 ASAN_ATOMIC_FUNC_SET(64, uint64_t);
698 ASAN_ATOMIC_FUNC_SET(int, u_int);
699 ASAN_ATOMIC_FUNC_SET(long, u_long);
700 ASAN_ATOMIC_FUNC_SET(ptr, uintptr_t);
702 ASAN_ATOMIC_FUNC_CLEAR(8, uint8_t);
703 ASAN_ATOMIC_FUNC_CLEAR(16, uint16_t);
704 ASAN_ATOMIC_FUNC_CLEAR(32, uint32_t);
705 ASAN_ATOMIC_FUNC_CLEAR(64, uint64_t);
706 ASAN_ATOMIC_FUNC_CLEAR(int, u_int);
707 ASAN_ATOMIC_FUNC_CLEAR(long, u_long);
708 ASAN_ATOMIC_FUNC_CLEAR(ptr, uintptr_t);
710 ASAN_ATOMIC_FUNC_FETCHADD(32, uint32_t);
711 ASAN_ATOMIC_FUNC_FETCHADD(64, uint64_t);
712 ASAN_ATOMIC_FUNC_FETCHADD(int, u_int);
713 ASAN_ATOMIC_FUNC_FETCHADD(long, u_long);
715 ASAN_ATOMIC_FUNC_READANDCLEAR(32, uint32_t);
716 ASAN_ATOMIC_FUNC_READANDCLEAR(64, uint64_t);
717 ASAN_ATOMIC_FUNC_READANDCLEAR(int, u_int);
718 ASAN_ATOMIC_FUNC_READANDCLEAR(long, u_long);
719 ASAN_ATOMIC_FUNC_READANDCLEAR(ptr, uintptr_t);
721 ASAN_ATOMIC_FUNC_TESTANDCLEAR(32, uint32_t);
722 ASAN_ATOMIC_FUNC_TESTANDCLEAR(64, uint64_t);
723 ASAN_ATOMIC_FUNC_TESTANDCLEAR(int, u_int);
724 ASAN_ATOMIC_FUNC_TESTANDCLEAR(long, u_long);
726 ASAN_ATOMIC_FUNC_TESTANDSET(32, uint32_t);
727 ASAN_ATOMIC_FUNC_TESTANDSET(64, uint64_t);
728 ASAN_ATOMIC_FUNC_TESTANDSET(int, u_int);
729 ASAN_ATOMIC_FUNC_TESTANDSET(long, u_long);
731 ASAN_ATOMIC_FUNC_SWAP(32, uint32_t);
732 ASAN_ATOMIC_FUNC_SWAP(64, uint64_t);
733 ASAN_ATOMIC_FUNC_SWAP(int, u_int);
734 ASAN_ATOMIC_FUNC_SWAP(long, u_long);
735 ASAN_ATOMIC_FUNC_SWAP(ptr, uintptr_t);
737 ASAN_ATOMIC_FUNC_CMPSET(8, uint8_t);
738 ASAN_ATOMIC_FUNC_CMPSET(16, uint16_t);
739 ASAN_ATOMIC_FUNC_CMPSET(32, uint32_t);
740 ASAN_ATOMIC_FUNC_CMPSET(64, uint64_t);
741 ASAN_ATOMIC_FUNC_CMPSET(int, u_int);
742 ASAN_ATOMIC_FUNC_CMPSET(long, u_long);
743 ASAN_ATOMIC_FUNC_CMPSET(ptr, uintptr_t);
745 ASAN_ATOMIC_FUNC_FCMPSET(8, uint8_t);
746 ASAN_ATOMIC_FUNC_FCMPSET(16, uint16_t);
747 ASAN_ATOMIC_FUNC_FCMPSET(32, uint32_t);
748 ASAN_ATOMIC_FUNC_FCMPSET(64, uint64_t);
749 ASAN_ATOMIC_FUNC_FCMPSET(int, u_int);
750 ASAN_ATOMIC_FUNC_FCMPSET(long, u_long);
751 ASAN_ATOMIC_FUNC_FCMPSET(ptr, uintptr_t);
753 ASAN_ATOMIC_FUNC_LOAD(8, uint8_t);
754 ASAN_ATOMIC_FUNC_LOAD(16, uint16_t);
755 ASAN_ATOMIC_FUNC_LOAD(32, uint32_t);
756 ASAN_ATOMIC_FUNC_LOAD(64, uint64_t);
757 ASAN_ATOMIC_FUNC_LOAD(char, u_char);
758 ASAN_ATOMIC_FUNC_LOAD(short, u_short);
759 ASAN_ATOMIC_FUNC_LOAD(int, u_int);
760 ASAN_ATOMIC_FUNC_LOAD(long, u_long);
761 ASAN_ATOMIC_FUNC_LOAD(ptr, uintptr_t);
763 ASAN_ATOMIC_FUNC_STORE(8, uint8_t);
764 ASAN_ATOMIC_FUNC_STORE(16, uint16_t);
765 ASAN_ATOMIC_FUNC_STORE(32, uint32_t);
766 ASAN_ATOMIC_FUNC_STORE(64, uint64_t);
767 ASAN_ATOMIC_FUNC_STORE(char, u_char);
768 ASAN_ATOMIC_FUNC_STORE(short, u_short);
769 ASAN_ATOMIC_FUNC_STORE(int, u_int);
770 ASAN_ATOMIC_FUNC_STORE(long, u_long);
771 ASAN_ATOMIC_FUNC_STORE(ptr, uintptr_t);
773 ASAN_ATOMIC_FUNC_THREAD_FENCE(acq);
774 ASAN_ATOMIC_FUNC_THREAD_FENCE(rel);
775 ASAN_ATOMIC_FUNC_THREAD_FENCE(acq_rel);
776 ASAN_ATOMIC_FUNC_THREAD_FENCE(seq_cst);
779 kasan_atomic_interrupt_fence(void)
783 /* -------------------------------------------------------------------------- */
786 #include <machine/bus.h>
787 #define BUS_SAN_PREFIX kasan
788 #include <sys/bus_san.h>
791 kasan_bus_space_map(bus_space_tag_t tag, bus_addr_t hnd, bus_size_t size,
792 int flags, bus_space_handle_t *handlep)
794 return (bus_space_map(tag, hnd, size, flags, handlep));
798 kasan_bus_space_unmap(bus_space_tag_t tag, bus_space_handle_t hnd,
801 bus_space_unmap(tag, hnd, size);
805 kasan_bus_space_subregion(bus_space_tag_t tag, bus_space_handle_t hnd,
806 bus_size_t offset, bus_size_t size, bus_space_handle_t *handlep)
808 return (bus_space_subregion(tag, hnd, offset, size, handlep));
812 kasan_bus_space_free(bus_space_tag_t tag, bus_space_handle_t hnd,
815 bus_space_free(tag, hnd, size);
819 kasan_bus_space_barrier(bus_space_tag_t tag, bus_space_handle_t hnd,
820 bus_size_t offset, bus_size_t size, int flags)
822 bus_space_barrier(tag, hnd, offset, size, flags);
825 #define ASAN_BUS_READ_FUNC(func, width, type) \
826 type kasan_bus_space_read##func##_##width(bus_space_tag_t tag, \
827 bus_space_handle_t hnd, bus_size_t offset) \
829 return (bus_space_read##func##_##width(tag, hnd, \
833 #define ASAN_BUS_READ_PTR_FUNC(func, width, type) \
834 void kasan_bus_space_read_##func##_##width(bus_space_tag_t tag, \
835 bus_space_handle_t hnd, bus_size_t size, type *buf, \
838 kasan_shadow_check((uintptr_t)buf, sizeof(type) * count,\
839 false, __RET_ADDR); \
840 bus_space_read_##func##_##width(tag, hnd, size, buf, \
844 ASAN_BUS_READ_FUNC(, 1, uint8_t)
845 ASAN_BUS_READ_FUNC(_stream, 1, uint8_t)
846 ASAN_BUS_READ_PTR_FUNC(multi, 1, uint8_t)
847 ASAN_BUS_READ_PTR_FUNC(multi_stream, 1, uint8_t)
848 ASAN_BUS_READ_PTR_FUNC(region, 1, uint8_t)
849 ASAN_BUS_READ_PTR_FUNC(region_stream, 1, uint8_t)
851 ASAN_BUS_READ_FUNC(, 2, uint16_t)
852 ASAN_BUS_READ_FUNC(_stream, 2, uint16_t)
853 ASAN_BUS_READ_PTR_FUNC(multi, 2, uint16_t)
854 ASAN_BUS_READ_PTR_FUNC(multi_stream, 2, uint16_t)
855 ASAN_BUS_READ_PTR_FUNC(region, 2, uint16_t)
856 ASAN_BUS_READ_PTR_FUNC(region_stream, 2, uint16_t)
858 ASAN_BUS_READ_FUNC(, 4, uint32_t)
859 ASAN_BUS_READ_FUNC(_stream, 4, uint32_t)
860 ASAN_BUS_READ_PTR_FUNC(multi, 4, uint32_t)
861 ASAN_BUS_READ_PTR_FUNC(multi_stream, 4, uint32_t)
862 ASAN_BUS_READ_PTR_FUNC(region, 4, uint32_t)
863 ASAN_BUS_READ_PTR_FUNC(region_stream, 4, uint32_t)
865 ASAN_BUS_READ_FUNC(, 8, uint64_t)
867 #define ASAN_BUS_WRITE_FUNC(func, width, type) \
868 void kasan_bus_space_write##func##_##width(bus_space_tag_t tag, \
869 bus_space_handle_t hnd, bus_size_t offset, type value) \
871 bus_space_write##func##_##width(tag, hnd, offset, value);\
874 #define ASAN_BUS_WRITE_PTR_FUNC(func, width, type) \
875 void kasan_bus_space_write_##func##_##width(bus_space_tag_t tag,\
876 bus_space_handle_t hnd, bus_size_t size, const type *buf, \
879 kasan_shadow_check((uintptr_t)buf, sizeof(type) * count,\
881 bus_space_write_##func##_##width(tag, hnd, size, buf, \
885 ASAN_BUS_WRITE_FUNC(, 1, uint8_t)
886 ASAN_BUS_WRITE_FUNC(_stream, 1, uint8_t)
887 ASAN_BUS_WRITE_PTR_FUNC(multi, 1, uint8_t)
888 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 1, uint8_t)
889 ASAN_BUS_WRITE_PTR_FUNC(region, 1, uint8_t)
890 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 1, uint8_t)
892 ASAN_BUS_WRITE_FUNC(, 2, uint16_t)
893 ASAN_BUS_WRITE_FUNC(_stream, 2, uint16_t)
894 ASAN_BUS_WRITE_PTR_FUNC(multi, 2, uint16_t)
895 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 2, uint16_t)
896 ASAN_BUS_WRITE_PTR_FUNC(region, 2, uint16_t)
897 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 2, uint16_t)
899 ASAN_BUS_WRITE_FUNC(, 4, uint32_t)
900 ASAN_BUS_WRITE_FUNC(_stream, 4, uint32_t)
901 ASAN_BUS_WRITE_PTR_FUNC(multi, 4, uint32_t)
902 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 4, uint32_t)
903 ASAN_BUS_WRITE_PTR_FUNC(region, 4, uint32_t)
904 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 4, uint32_t)
906 ASAN_BUS_WRITE_FUNC(, 8, uint64_t)
908 #define ASAN_BUS_SET_FUNC(func, width, type) \
909 void kasan_bus_space_set_##func##_##width(bus_space_tag_t tag, \
910 bus_space_handle_t hnd, bus_size_t offset, type value, \
913 bus_space_set_##func##_##width(tag, hnd, offset, value, \
917 ASAN_BUS_SET_FUNC(multi, 1, uint8_t)
918 ASAN_BUS_SET_FUNC(region, 1, uint8_t)
919 ASAN_BUS_SET_FUNC(multi_stream, 1, uint8_t)
920 ASAN_BUS_SET_FUNC(region_stream, 1, uint8_t)
922 ASAN_BUS_SET_FUNC(multi, 2, uint16_t)
923 ASAN_BUS_SET_FUNC(region, 2, uint16_t)
924 ASAN_BUS_SET_FUNC(multi_stream, 2, uint16_t)
925 ASAN_BUS_SET_FUNC(region_stream, 2, uint16_t)
927 ASAN_BUS_SET_FUNC(multi, 4, uint32_t)
928 ASAN_BUS_SET_FUNC(region, 4, uint32_t)
929 ASAN_BUS_SET_FUNC(multi_stream, 4, uint32_t)
930 ASAN_BUS_SET_FUNC(region_stream, 4, uint32_t)
932 /* -------------------------------------------------------------------------- */
934 void __asan_register_globals(struct __asan_global *, size_t);
935 void __asan_unregister_globals(struct __asan_global *, size_t);
938 __asan_register_globals(struct __asan_global *globals, size_t n)
942 for (i = 0; i < n; i++) {
943 kasan_mark(globals[i].beg, globals[i].size,
944 globals[i].size_with_redzone, KASAN_GENERIC_REDZONE);
949 __asan_unregister_globals(struct __asan_global *globals, size_t n)
954 #define ASAN_LOAD_STORE(size) \
955 void __asan_load##size(unsigned long); \
956 void __asan_load##size(unsigned long addr) \
958 kasan_shadow_check(addr, size, false, __RET_ADDR);\
960 void __asan_load##size##_noabort(unsigned long); \
961 void __asan_load##size##_noabort(unsigned long addr) \
963 kasan_shadow_check(addr, size, false, __RET_ADDR);\
965 void __asan_store##size(unsigned long); \
966 void __asan_store##size(unsigned long addr) \
968 kasan_shadow_check(addr, size, true, __RET_ADDR);\
970 void __asan_store##size##_noabort(unsigned long); \
971 void __asan_store##size##_noabort(unsigned long addr) \
973 kasan_shadow_check(addr, size, true, __RET_ADDR);\
982 void __asan_loadN(unsigned long, size_t);
983 void __asan_loadN_noabort(unsigned long, size_t);
984 void __asan_storeN(unsigned long, size_t);
985 void __asan_storeN_noabort(unsigned long, size_t);
986 void __asan_handle_no_return(void);
989 __asan_loadN(unsigned long addr, size_t size)
991 kasan_shadow_check(addr, size, false, __RET_ADDR);
995 __asan_loadN_noabort(unsigned long addr, size_t size)
997 kasan_shadow_check(addr, size, false, __RET_ADDR);
1001 __asan_storeN(unsigned long addr, size_t size)
1003 kasan_shadow_check(addr, size, true, __RET_ADDR);
1007 __asan_storeN_noabort(unsigned long addr, size_t size)
1009 kasan_shadow_check(addr, size, true, __RET_ADDR);
1013 __asan_handle_no_return(void)
1018 #define ASAN_SET_SHADOW(byte) \
1019 void __asan_set_shadow_##byte(void *, size_t); \
1020 void __asan_set_shadow_##byte(void *addr, size_t size) \
1022 __builtin_memset((void *)addr, 0x##byte, size); \
1025 ASAN_SET_SHADOW(00);
1026 ASAN_SET_SHADOW(f1);
1027 ASAN_SET_SHADOW(f2);
1028 ASAN_SET_SHADOW(f3);
1029 ASAN_SET_SHADOW(f5);
1030 ASAN_SET_SHADOW(f8);
1032 void __asan_poison_stack_memory(const void *, size_t);
1033 void __asan_unpoison_stack_memory(const void *, size_t);
1036 __asan_poison_stack_memory(const void *addr, size_t size)
1038 size = roundup(size, KASAN_SHADOW_SCALE);
1039 kasan_shadow_Nbyte_fill(addr, size, KASAN_USE_AFTER_SCOPE);
1043 __asan_unpoison_stack_memory(const void *addr, size_t size)
1045 kasan_shadow_Nbyte_markvalid(addr, size);
1048 void __asan_alloca_poison(const void *, size_t);
1049 void __asan_allocas_unpoison(const void *, const void *);
1052 __asan_alloca_poison(const void *addr, size_t size)
1056 KASSERT((vm_offset_t)addr % KASAN_ALLOCA_SCALE_SIZE == 0,
1057 ("%s: invalid address %p", __func__, addr));
1059 l = (const uint8_t *)addr - KASAN_ALLOCA_SCALE_SIZE;
1060 r = (const uint8_t *)addr + roundup(size, KASAN_ALLOCA_SCALE_SIZE);
1062 kasan_shadow_Nbyte_fill(l, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_LEFT);
1063 kasan_mark(addr, size, roundup(size, KASAN_ALLOCA_SCALE_SIZE),
1065 kasan_shadow_Nbyte_fill(r, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_RIGHT);
1069 __asan_allocas_unpoison(const void *stkbegin, const void *stkend)
1073 if (__predict_false(!stkbegin))
1075 if (__predict_false((uintptr_t)stkbegin > (uintptr_t)stkend))
1077 size = (uintptr_t)stkend - (uintptr_t)stkbegin;
1079 kasan_shadow_Nbyte_fill(stkbegin, size, 0);
1082 void __asan_poison_memory_region(const void *addr, size_t size);
1083 void __asan_unpoison_memory_region(const void *addr, size_t size);
1086 __asan_poison_memory_region(const void *addr, size_t size)
1091 __asan_unpoison_memory_region(const void *addr, size_t size)