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_san_enter(sva + ptoa(i));
131 TUNABLE_INT_FETCH("debug.kasan.disabled", &disabled);
135 /* MD initialization. */
138 /* Now officially enabled. */
139 kasan_enabled = true;
143 kasan_init_early(vm_offset_t stack, size_t size)
145 kasan_md_init_early(stack, size);
148 static inline const char *
149 kasan_code_name(uint8_t code)
152 case KASAN_GENERIC_REDZONE:
153 return "GenericRedZone";
154 case KASAN_MALLOC_REDZONE:
155 return "MallocRedZone";
156 case KASAN_KMEM_REDZONE:
157 return "KmemRedZone";
158 case KASAN_UMA_FREED:
159 return "UMAUseAfterFree";
160 case KASAN_KSTACK_FREED:
161 return "KernelStack";
162 case KASAN_EXEC_ARGS_FREED:
165 return "RedZonePartial";
166 case KASAN_STACK_LEFT:
168 case KASAN_STACK_MID:
169 return "StackMiddle";
170 case KASAN_STACK_RIGHT:
172 case KASAN_USE_AFTER_RET:
173 return "UseAfterRet";
174 case KASAN_USE_AFTER_SCOPE:
175 return "UseAfterScope";
181 #define REPORT(f, ...) do { \
182 if (panic_on_violation) { \
183 kasan_enabled = false; \
184 panic(f, __VA_ARGS__); \
189 printf(f "\n", __VA_ARGS__); \
190 stack_print_ddb(&st); \
195 kasan_report(unsigned long addr, size_t size, bool write, unsigned long pc,
198 REPORT("ASan: Invalid access, %zu-byte %s at %#lx, %s(%x)",
199 size, (write ? "write" : "read"), addr, kasan_code_name(code),
203 static __always_inline void
204 kasan_shadow_1byte_markvalid(unsigned long addr)
206 int8_t *byte = (int8_t *)kasan_md_addr_to_shad(addr);
207 int8_t last = (addr & KASAN_SHADOW_MASK) + 1;
212 static __always_inline void
213 kasan_shadow_Nbyte_markvalid(const void *addr, size_t size)
217 for (i = 0; i < size; i++) {
218 kasan_shadow_1byte_markvalid((unsigned long)addr + i);
222 static __always_inline void
223 kasan_shadow_Nbyte_fill(const void *addr, size_t size, uint8_t code)
227 if (__predict_false(size == 0))
229 if (__predict_false(kasan_md_unsupported((vm_offset_t)addr)))
232 KASSERT((vm_offset_t)addr % KASAN_SHADOW_SCALE == 0,
233 ("%s: invalid address %p", __func__, addr));
234 KASSERT(size % KASAN_SHADOW_SCALE == 0,
235 ("%s: invalid size %zu", __func__, size));
237 shad = (void *)kasan_md_addr_to_shad((uintptr_t)addr);
238 size = size >> KASAN_SHADOW_SCALE_SHIFT;
240 __builtin_memset(shad, code, size);
244 * In an area of size 'sz_with_redz', mark the 'size' first bytes as valid,
245 * and the rest as invalid. There are generally two use cases:
247 * o kasan_mark(addr, origsize, size, code), with origsize < size. This marks
248 * the redzone at the end of the buffer as invalid. If the entire is to be
249 * marked invalid, origsize will be 0.
251 * o kasan_mark(addr, size, size, 0). This marks the entire buffer as valid.
254 kasan_mark(const void *addr, size_t size, size_t redzsize, uint8_t code)
259 if ((vm_offset_t)addr >= DMAP_MIN_ADDRESS &&
260 (vm_offset_t)addr < DMAP_MAX_ADDRESS)
263 KASSERT((vm_offset_t)addr >= VM_MIN_KERNEL_ADDRESS &&
264 (vm_offset_t)addr < VM_MAX_KERNEL_ADDRESS,
265 ("%s: invalid address %p", __func__, addr));
266 KASSERT((vm_offset_t)addr % KASAN_SHADOW_SCALE == 0,
267 ("%s: invalid address %p", __func__, addr));
268 redz = redzsize - roundup(size, KASAN_SHADOW_SCALE);
269 KASSERT(redz % KASAN_SHADOW_SCALE == 0,
270 ("%s: invalid size %zu", __func__, redz));
271 shad = (int8_t *)kasan_md_addr_to_shad((uintptr_t)addr);
273 /* Chunks of 8 bytes, valid. */
274 n = size / KASAN_SHADOW_SCALE;
275 for (i = 0; i < n; i++) {
279 /* Possibly one chunk, mid. */
280 if ((size & KASAN_SHADOW_MASK) != 0) {
281 *shad++ = (size & KASAN_SHADOW_MASK);
284 /* Chunks of 8 bytes, invalid. */
285 n = redz / KASAN_SHADOW_SCALE;
286 for (i = 0; i < n; i++) {
291 /* -------------------------------------------------------------------------- */
293 #define ADDR_CROSSES_SCALE_BOUNDARY(addr, size) \
294 (addr >> KASAN_SHADOW_SCALE_SHIFT) != \
295 ((addr + size - 1) >> KASAN_SHADOW_SCALE_SHIFT)
297 static __always_inline bool
298 kasan_shadow_1byte_isvalid(unsigned long addr, uint8_t *code)
300 int8_t *byte = (int8_t *)kasan_md_addr_to_shad(addr);
301 int8_t last = (addr & KASAN_SHADOW_MASK) + 1;
303 if (__predict_true(*byte == 0 || last <= *byte)) {
310 static __always_inline bool
311 kasan_shadow_2byte_isvalid(unsigned long addr, uint8_t *code)
315 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 2)) {
316 return (kasan_shadow_1byte_isvalid(addr, code) &&
317 kasan_shadow_1byte_isvalid(addr+1, code));
320 byte = (int8_t *)kasan_md_addr_to_shad(addr);
321 last = ((addr + 1) & KASAN_SHADOW_MASK) + 1;
323 if (__predict_true(*byte == 0 || last <= *byte)) {
330 static __always_inline bool
331 kasan_shadow_4byte_isvalid(unsigned long addr, uint8_t *code)
335 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 4)) {
336 return (kasan_shadow_2byte_isvalid(addr, code) &&
337 kasan_shadow_2byte_isvalid(addr+2, code));
340 byte = (int8_t *)kasan_md_addr_to_shad(addr);
341 last = ((addr + 3) & KASAN_SHADOW_MASK) + 1;
343 if (__predict_true(*byte == 0 || last <= *byte)) {
350 static __always_inline bool
351 kasan_shadow_8byte_isvalid(unsigned long addr, uint8_t *code)
355 if (ADDR_CROSSES_SCALE_BOUNDARY(addr, 8)) {
356 return (kasan_shadow_4byte_isvalid(addr, code) &&
357 kasan_shadow_4byte_isvalid(addr+4, code));
360 byte = (int8_t *)kasan_md_addr_to_shad(addr);
361 last = ((addr + 7) & KASAN_SHADOW_MASK) + 1;
363 if (__predict_true(*byte == 0 || last <= *byte)) {
370 static __always_inline bool
371 kasan_shadow_Nbyte_isvalid(unsigned long addr, size_t size, uint8_t *code)
375 for (i = 0; i < size; i++) {
376 if (!kasan_shadow_1byte_isvalid(addr+i, code))
383 static __always_inline void
384 kasan_shadow_check(unsigned long addr, size_t size, bool write,
385 unsigned long retaddr)
390 if (__predict_false(!kasan_enabled))
392 if (__predict_false(size == 0))
394 if (__predict_false(kasan_md_unsupported(addr)))
396 if (KERNEL_PANICKED())
399 if (__builtin_constant_p(size)) {
402 valid = kasan_shadow_1byte_isvalid(addr, &code);
405 valid = kasan_shadow_2byte_isvalid(addr, &code);
408 valid = kasan_shadow_4byte_isvalid(addr, &code);
411 valid = kasan_shadow_8byte_isvalid(addr, &code);
414 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code);
418 valid = kasan_shadow_Nbyte_isvalid(addr, size, &code);
421 if (__predict_false(!valid)) {
422 kasan_report(addr, size, write, retaddr, code);
426 /* -------------------------------------------------------------------------- */
429 kasan_memcpy(void *dst, const void *src, size_t len)
431 kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR);
432 kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR);
433 return (__builtin_memcpy(dst, src, len));
437 kasan_memcmp(const void *b1, const void *b2, size_t len)
439 kasan_shadow_check((unsigned long)b1, len, false, __RET_ADDR);
440 kasan_shadow_check((unsigned long)b2, len, false, __RET_ADDR);
441 return (__builtin_memcmp(b1, b2, len));
445 kasan_memset(void *b, int c, size_t len)
447 kasan_shadow_check((unsigned long)b, len, true, __RET_ADDR);
448 return (__builtin_memset(b, c, len));
452 kasan_memmove(void *dst, const void *src, size_t len)
454 kasan_shadow_check((unsigned long)src, len, false, __RET_ADDR);
455 kasan_shadow_check((unsigned long)dst, len, true, __RET_ADDR);
456 return (__builtin_memmove(dst, src, len));
460 kasan_strlen(const char *str)
466 kasan_shadow_check((unsigned long)s, 1, false, __RET_ADDR);
476 kasan_strcpy(char *dst, const char *src)
481 kasan_shadow_check((unsigned long)src, 1, false, __RET_ADDR);
482 kasan_shadow_check((unsigned long)dst, 1, true, __RET_ADDR);
493 kasan_strcmp(const char *s1, const char *s2)
496 kasan_shadow_check((unsigned long)s1, 1, false, __RET_ADDR);
497 kasan_shadow_check((unsigned long)s2, 1, false, __RET_ADDR);
505 return (*(const unsigned char *)s1 - *(const unsigned char *)s2);
509 kasan_copyin(const void *uaddr, void *kaddr, size_t len)
511 kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR);
512 return (copyin(uaddr, kaddr, len));
516 kasan_copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done)
518 kasan_shadow_check((unsigned long)kaddr, len, true, __RET_ADDR);
519 return (copyinstr(uaddr, kaddr, len, done));
523 kasan_copyout(const void *kaddr, void *uaddr, size_t len)
525 kasan_shadow_check((unsigned long)kaddr, len, false, __RET_ADDR);
526 return (copyout(kaddr, uaddr, len));
529 /* -------------------------------------------------------------------------- */
532 kasan_fubyte(volatile const void *base)
534 return (fubyte(base));
538 kasan_fuword16(volatile const void *base)
540 return (fuword16(base));
544 kasan_fueword(volatile const void *base, long *val)
546 kasan_shadow_check((unsigned long)val, sizeof(*val), true, __RET_ADDR);
547 return (fueword(base, val));
551 kasan_fueword32(volatile const void *base, int32_t *val)
553 kasan_shadow_check((unsigned long)val, sizeof(*val), true, __RET_ADDR);
554 return (fueword32(base, val));
558 kasan_fueword64(volatile const void *base, int64_t *val)
560 kasan_shadow_check((unsigned long)val, sizeof(*val), true, __RET_ADDR);
561 return (fueword64(base, val));
565 kasan_subyte(volatile void *base, int byte)
567 return (subyte(base, byte));
571 kasan_suword(volatile void *base, long word)
573 return (suword(base, word));
577 kasan_suword16(volatile void *base, int word)
579 return (suword16(base, word));
583 kasan_suword32(volatile void *base, int32_t word)
585 return (suword32(base, word));
589 kasan_suword64(volatile void *base, int64_t word)
591 return (suword64(base, word));
595 kasan_casueword32(volatile uint32_t *base, uint32_t oldval, uint32_t *oldvalp,
598 kasan_shadow_check((unsigned long)oldvalp, sizeof(*oldvalp), true,
600 return (casueword32(base, oldval, oldvalp, newval));
604 kasan_casueword(volatile u_long *base, u_long oldval, u_long *oldvalp,
607 kasan_shadow_check((unsigned long)oldvalp, sizeof(*oldvalp), true,
609 return (casueword(base, oldval, oldvalp, newval));
612 /* -------------------------------------------------------------------------- */
614 #include <machine/atomic.h>
615 #include <sys/atomic_san.h>
617 #define _ASAN_ATOMIC_FUNC_ADD(name, type) \
618 void kasan_atomic_add_##name(volatile type *ptr, type val) \
620 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
622 atomic_add_##name(ptr, val); \
625 #define ASAN_ATOMIC_FUNC_ADD(name, type) \
626 _ASAN_ATOMIC_FUNC_ADD(name, type) \
627 _ASAN_ATOMIC_FUNC_ADD(acq_##name, type) \
628 _ASAN_ATOMIC_FUNC_ADD(rel_##name, type)
630 #define _ASAN_ATOMIC_FUNC_SUBTRACT(name, type) \
631 void kasan_atomic_subtract_##name(volatile type *ptr, type val) \
633 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
635 atomic_subtract_##name(ptr, val); \
638 #define ASAN_ATOMIC_FUNC_SUBTRACT(name, type) \
639 _ASAN_ATOMIC_FUNC_SUBTRACT(name, type) \
640 _ASAN_ATOMIC_FUNC_SUBTRACT(acq_##name, type) \
641 _ASAN_ATOMIC_FUNC_SUBTRACT(rel_##name, type)
643 #define _ASAN_ATOMIC_FUNC_SET(name, type) \
644 void kasan_atomic_set_##name(volatile type *ptr, type val) \
646 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
648 atomic_set_##name(ptr, val); \
651 #define ASAN_ATOMIC_FUNC_SET(name, type) \
652 _ASAN_ATOMIC_FUNC_SET(name, type) \
653 _ASAN_ATOMIC_FUNC_SET(acq_##name, type) \
654 _ASAN_ATOMIC_FUNC_SET(rel_##name, type)
656 #define _ASAN_ATOMIC_FUNC_CLEAR(name, type) \
657 void kasan_atomic_clear_##name(volatile type *ptr, type val) \
659 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
661 atomic_clear_##name(ptr, val); \
664 #define ASAN_ATOMIC_FUNC_CLEAR(name, type) \
665 _ASAN_ATOMIC_FUNC_CLEAR(name, type) \
666 _ASAN_ATOMIC_FUNC_CLEAR(acq_##name, type) \
667 _ASAN_ATOMIC_FUNC_CLEAR(rel_##name, type)
669 #define ASAN_ATOMIC_FUNC_FETCHADD(name, type) \
670 type kasan_atomic_fetchadd_##name(volatile type *ptr, type val) \
672 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
674 return (atomic_fetchadd_##name(ptr, val)); \
677 #define ASAN_ATOMIC_FUNC_READANDCLEAR(name, type) \
678 type kasan_atomic_readandclear_##name(volatile type *ptr) \
680 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
682 return (atomic_readandclear_##name(ptr)); \
685 #define ASAN_ATOMIC_FUNC_TESTANDCLEAR(name, type) \
686 int kasan_atomic_testandclear_##name(volatile type *ptr, u_int v) \
688 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
690 return (atomic_testandclear_##name(ptr, v)); \
693 #define ASAN_ATOMIC_FUNC_TESTANDSET(name, type) \
694 int kasan_atomic_testandset_##name(volatile type *ptr, u_int v) \
696 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
698 return (atomic_testandset_##name(ptr, v)); \
701 #define ASAN_ATOMIC_FUNC_SWAP(name, type) \
702 type kasan_atomic_swap_##name(volatile type *ptr, type val) \
704 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
706 return (atomic_swap_##name(ptr, val)); \
709 #define _ASAN_ATOMIC_FUNC_CMPSET(name, type) \
710 int kasan_atomic_cmpset_##name(volatile type *ptr, type oval, \
713 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
715 return (atomic_cmpset_##name(ptr, oval, nval)); \
718 #define ASAN_ATOMIC_FUNC_CMPSET(name, type) \
719 _ASAN_ATOMIC_FUNC_CMPSET(name, type) \
720 _ASAN_ATOMIC_FUNC_CMPSET(acq_##name, type) \
721 _ASAN_ATOMIC_FUNC_CMPSET(rel_##name, type)
723 #define _ASAN_ATOMIC_FUNC_FCMPSET(name, type) \
724 int kasan_atomic_fcmpset_##name(volatile type *ptr, type *oval, \
727 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
729 return (atomic_fcmpset_##name(ptr, oval, nval)); \
732 #define ASAN_ATOMIC_FUNC_FCMPSET(name, type) \
733 _ASAN_ATOMIC_FUNC_FCMPSET(name, type) \
734 _ASAN_ATOMIC_FUNC_FCMPSET(acq_##name, type) \
735 _ASAN_ATOMIC_FUNC_FCMPSET(rel_##name, type)
737 #define ASAN_ATOMIC_FUNC_THREAD_FENCE(name) \
738 void kasan_atomic_thread_fence_##name(void) \
740 atomic_thread_fence_##name(); \
743 #define _ASAN_ATOMIC_FUNC_LOAD(name, type) \
744 type kasan_atomic_load_##name(volatile type *ptr) \
746 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
748 return (atomic_load_##name(ptr)); \
751 #define ASAN_ATOMIC_FUNC_LOAD(name, type) \
752 _ASAN_ATOMIC_FUNC_LOAD(name, type) \
753 _ASAN_ATOMIC_FUNC_LOAD(acq_##name, type)
755 #define _ASAN_ATOMIC_FUNC_STORE(name, type) \
756 void kasan_atomic_store_##name(volatile type *ptr, type val) \
758 kasan_shadow_check((uintptr_t)ptr, sizeof(type), true, \
760 atomic_store_##name(ptr, val); \
763 #define ASAN_ATOMIC_FUNC_STORE(name, type) \
764 _ASAN_ATOMIC_FUNC_STORE(name, type) \
765 _ASAN_ATOMIC_FUNC_STORE(rel_##name, type)
767 ASAN_ATOMIC_FUNC_ADD(8, uint8_t);
768 ASAN_ATOMIC_FUNC_ADD(16, uint16_t);
769 ASAN_ATOMIC_FUNC_ADD(32, uint32_t);
770 ASAN_ATOMIC_FUNC_ADD(64, uint64_t);
771 ASAN_ATOMIC_FUNC_ADD(int, u_int);
772 ASAN_ATOMIC_FUNC_ADD(long, u_long);
773 ASAN_ATOMIC_FUNC_ADD(ptr, uintptr_t);
775 ASAN_ATOMIC_FUNC_SUBTRACT(8, uint8_t);
776 ASAN_ATOMIC_FUNC_SUBTRACT(16, uint16_t);
777 ASAN_ATOMIC_FUNC_SUBTRACT(32, uint32_t);
778 ASAN_ATOMIC_FUNC_SUBTRACT(64, uint64_t);
779 ASAN_ATOMIC_FUNC_SUBTRACT(int, u_int);
780 ASAN_ATOMIC_FUNC_SUBTRACT(long, u_long);
781 ASAN_ATOMIC_FUNC_SUBTRACT(ptr, uintptr_t);
783 ASAN_ATOMIC_FUNC_SET(8, uint8_t);
784 ASAN_ATOMIC_FUNC_SET(16, uint16_t);
785 ASAN_ATOMIC_FUNC_SET(32, uint32_t);
786 ASAN_ATOMIC_FUNC_SET(64, uint64_t);
787 ASAN_ATOMIC_FUNC_SET(int, u_int);
788 ASAN_ATOMIC_FUNC_SET(long, u_long);
789 ASAN_ATOMIC_FUNC_SET(ptr, uintptr_t);
791 ASAN_ATOMIC_FUNC_CLEAR(8, uint8_t);
792 ASAN_ATOMIC_FUNC_CLEAR(16, uint16_t);
793 ASAN_ATOMIC_FUNC_CLEAR(32, uint32_t);
794 ASAN_ATOMIC_FUNC_CLEAR(64, uint64_t);
795 ASAN_ATOMIC_FUNC_CLEAR(int, u_int);
796 ASAN_ATOMIC_FUNC_CLEAR(long, u_long);
797 ASAN_ATOMIC_FUNC_CLEAR(ptr, uintptr_t);
799 ASAN_ATOMIC_FUNC_FETCHADD(32, uint32_t);
800 ASAN_ATOMIC_FUNC_FETCHADD(64, uint64_t);
801 ASAN_ATOMIC_FUNC_FETCHADD(int, u_int);
802 ASAN_ATOMIC_FUNC_FETCHADD(long, u_long);
804 ASAN_ATOMIC_FUNC_READANDCLEAR(32, uint32_t);
805 ASAN_ATOMIC_FUNC_READANDCLEAR(64, uint64_t);
806 ASAN_ATOMIC_FUNC_READANDCLEAR(int, u_int);
807 ASAN_ATOMIC_FUNC_READANDCLEAR(long, u_long);
808 ASAN_ATOMIC_FUNC_READANDCLEAR(ptr, uintptr_t);
810 ASAN_ATOMIC_FUNC_TESTANDCLEAR(32, uint32_t);
811 ASAN_ATOMIC_FUNC_TESTANDCLEAR(64, uint64_t);
812 ASAN_ATOMIC_FUNC_TESTANDCLEAR(int, u_int);
813 ASAN_ATOMIC_FUNC_TESTANDCLEAR(long, u_long);
815 ASAN_ATOMIC_FUNC_TESTANDSET(32, uint32_t);
816 ASAN_ATOMIC_FUNC_TESTANDSET(64, uint64_t);
817 ASAN_ATOMIC_FUNC_TESTANDSET(int, u_int);
818 ASAN_ATOMIC_FUNC_TESTANDSET(long, u_long);
820 ASAN_ATOMIC_FUNC_SWAP(32, uint32_t);
821 ASAN_ATOMIC_FUNC_SWAP(64, uint64_t);
822 ASAN_ATOMIC_FUNC_SWAP(int, u_int);
823 ASAN_ATOMIC_FUNC_SWAP(long, u_long);
824 ASAN_ATOMIC_FUNC_SWAP(ptr, uintptr_t);
826 ASAN_ATOMIC_FUNC_CMPSET(8, uint8_t);
827 ASAN_ATOMIC_FUNC_CMPSET(16, uint16_t);
828 ASAN_ATOMIC_FUNC_CMPSET(32, uint32_t);
829 ASAN_ATOMIC_FUNC_CMPSET(64, uint64_t);
830 ASAN_ATOMIC_FUNC_CMPSET(int, u_int);
831 ASAN_ATOMIC_FUNC_CMPSET(long, u_long);
832 ASAN_ATOMIC_FUNC_CMPSET(ptr, uintptr_t);
834 ASAN_ATOMIC_FUNC_FCMPSET(8, uint8_t);
835 ASAN_ATOMIC_FUNC_FCMPSET(16, uint16_t);
836 ASAN_ATOMIC_FUNC_FCMPSET(32, uint32_t);
837 ASAN_ATOMIC_FUNC_FCMPSET(64, uint64_t);
838 ASAN_ATOMIC_FUNC_FCMPSET(int, u_int);
839 ASAN_ATOMIC_FUNC_FCMPSET(long, u_long);
840 ASAN_ATOMIC_FUNC_FCMPSET(ptr, uintptr_t);
842 ASAN_ATOMIC_FUNC_LOAD(8, uint8_t);
843 ASAN_ATOMIC_FUNC_LOAD(16, uint16_t);
844 ASAN_ATOMIC_FUNC_LOAD(32, uint32_t);
845 ASAN_ATOMIC_FUNC_LOAD(64, uint64_t);
846 ASAN_ATOMIC_FUNC_LOAD(char, u_char);
847 ASAN_ATOMIC_FUNC_LOAD(short, u_short);
848 ASAN_ATOMIC_FUNC_LOAD(int, u_int);
849 ASAN_ATOMIC_FUNC_LOAD(long, u_long);
850 ASAN_ATOMIC_FUNC_LOAD(ptr, uintptr_t);
852 ASAN_ATOMIC_FUNC_STORE(8, uint8_t);
853 ASAN_ATOMIC_FUNC_STORE(16, uint16_t);
854 ASAN_ATOMIC_FUNC_STORE(32, uint32_t);
855 ASAN_ATOMIC_FUNC_STORE(64, uint64_t);
856 ASAN_ATOMIC_FUNC_STORE(char, u_char);
857 ASAN_ATOMIC_FUNC_STORE(short, u_short);
858 ASAN_ATOMIC_FUNC_STORE(int, u_int);
859 ASAN_ATOMIC_FUNC_STORE(long, u_long);
860 ASAN_ATOMIC_FUNC_STORE(ptr, uintptr_t);
862 ASAN_ATOMIC_FUNC_THREAD_FENCE(acq);
863 ASAN_ATOMIC_FUNC_THREAD_FENCE(rel);
864 ASAN_ATOMIC_FUNC_THREAD_FENCE(acq_rel);
865 ASAN_ATOMIC_FUNC_THREAD_FENCE(seq_cst);
868 kasan_atomic_interrupt_fence(void)
872 /* -------------------------------------------------------------------------- */
875 #include <machine/bus.h>
876 #include <sys/bus_san.h>
879 kasan_bus_space_map(bus_space_tag_t tag, bus_addr_t hnd, bus_size_t size,
880 int flags, bus_space_handle_t *handlep)
882 return (bus_space_map(tag, hnd, size, flags, handlep));
886 kasan_bus_space_unmap(bus_space_tag_t tag, bus_space_handle_t hnd,
889 bus_space_unmap(tag, hnd, size);
893 kasan_bus_space_subregion(bus_space_tag_t tag, bus_space_handle_t hnd,
894 bus_size_t offset, bus_size_t size, bus_space_handle_t *handlep)
896 return (bus_space_subregion(tag, hnd, offset, size, handlep));
900 kasan_bus_space_free(bus_space_tag_t tag, bus_space_handle_t hnd,
903 bus_space_free(tag, hnd, size);
907 kasan_bus_space_barrier(bus_space_tag_t tag, bus_space_handle_t hnd,
908 bus_size_t offset, bus_size_t size, int flags)
910 bus_space_barrier(tag, hnd, offset, size, flags);
913 #define ASAN_BUS_READ_FUNC(func, width, type) \
914 type kasan_bus_space_read##func##_##width(bus_space_tag_t tag, \
915 bus_space_handle_t hnd, bus_size_t offset) \
917 return (bus_space_read##func##_##width(tag, hnd, \
921 #define ASAN_BUS_READ_PTR_FUNC(func, width, type) \
922 void kasan_bus_space_read_##func##_##width(bus_space_tag_t tag, \
923 bus_space_handle_t hnd, bus_size_t size, type *buf, \
926 kasan_shadow_check((uintptr_t)buf, sizeof(type) * count,\
927 false, __RET_ADDR); \
928 bus_space_read_##func##_##width(tag, hnd, size, buf, \
932 ASAN_BUS_READ_FUNC(, 1, uint8_t)
933 ASAN_BUS_READ_FUNC(_stream, 1, uint8_t)
934 ASAN_BUS_READ_PTR_FUNC(multi, 1, uint8_t)
935 ASAN_BUS_READ_PTR_FUNC(multi_stream, 1, uint8_t)
936 ASAN_BUS_READ_PTR_FUNC(region, 1, uint8_t)
937 ASAN_BUS_READ_PTR_FUNC(region_stream, 1, uint8_t)
939 ASAN_BUS_READ_FUNC(, 2, uint16_t)
940 ASAN_BUS_READ_FUNC(_stream, 2, uint16_t)
941 ASAN_BUS_READ_PTR_FUNC(multi, 2, uint16_t)
942 ASAN_BUS_READ_PTR_FUNC(multi_stream, 2, uint16_t)
943 ASAN_BUS_READ_PTR_FUNC(region, 2, uint16_t)
944 ASAN_BUS_READ_PTR_FUNC(region_stream, 2, uint16_t)
946 ASAN_BUS_READ_FUNC(, 4, uint32_t)
947 ASAN_BUS_READ_FUNC(_stream, 4, uint32_t)
948 ASAN_BUS_READ_PTR_FUNC(multi, 4, uint32_t)
949 ASAN_BUS_READ_PTR_FUNC(multi_stream, 4, uint32_t)
950 ASAN_BUS_READ_PTR_FUNC(region, 4, uint32_t)
951 ASAN_BUS_READ_PTR_FUNC(region_stream, 4, uint32_t)
953 ASAN_BUS_READ_FUNC(, 8, uint64_t)
955 #define ASAN_BUS_WRITE_FUNC(func, width, type) \
956 void kasan_bus_space_write##func##_##width(bus_space_tag_t tag, \
957 bus_space_handle_t hnd, bus_size_t offset, type value) \
959 bus_space_write##func##_##width(tag, hnd, offset, value);\
962 #define ASAN_BUS_WRITE_PTR_FUNC(func, width, type) \
963 void kasan_bus_space_write_##func##_##width(bus_space_tag_t tag,\
964 bus_space_handle_t hnd, bus_size_t size, const type *buf, \
967 kasan_shadow_check((uintptr_t)buf, sizeof(type) * count,\
969 bus_space_write_##func##_##width(tag, hnd, size, buf, \
973 ASAN_BUS_WRITE_FUNC(, 1, uint8_t)
974 ASAN_BUS_WRITE_FUNC(_stream, 1, uint8_t)
975 ASAN_BUS_WRITE_PTR_FUNC(multi, 1, uint8_t)
976 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 1, uint8_t)
977 ASAN_BUS_WRITE_PTR_FUNC(region, 1, uint8_t)
978 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 1, uint8_t)
980 ASAN_BUS_WRITE_FUNC(, 2, uint16_t)
981 ASAN_BUS_WRITE_FUNC(_stream, 2, uint16_t)
982 ASAN_BUS_WRITE_PTR_FUNC(multi, 2, uint16_t)
983 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 2, uint16_t)
984 ASAN_BUS_WRITE_PTR_FUNC(region, 2, uint16_t)
985 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 2, uint16_t)
987 ASAN_BUS_WRITE_FUNC(, 4, uint32_t)
988 ASAN_BUS_WRITE_FUNC(_stream, 4, uint32_t)
989 ASAN_BUS_WRITE_PTR_FUNC(multi, 4, uint32_t)
990 ASAN_BUS_WRITE_PTR_FUNC(multi_stream, 4, uint32_t)
991 ASAN_BUS_WRITE_PTR_FUNC(region, 4, uint32_t)
992 ASAN_BUS_WRITE_PTR_FUNC(region_stream, 4, uint32_t)
994 ASAN_BUS_WRITE_FUNC(, 8, uint64_t)
996 #define ASAN_BUS_SET_FUNC(func, width, type) \
997 void kasan_bus_space_set_##func##_##width(bus_space_tag_t tag, \
998 bus_space_handle_t hnd, bus_size_t offset, type value, \
1001 bus_space_set_##func##_##width(tag, hnd, offset, value, \
1005 ASAN_BUS_SET_FUNC(multi, 1, uint8_t)
1006 ASAN_BUS_SET_FUNC(region, 1, uint8_t)
1007 ASAN_BUS_SET_FUNC(multi_stream, 1, uint8_t)
1008 ASAN_BUS_SET_FUNC(region_stream, 1, uint8_t)
1010 ASAN_BUS_SET_FUNC(multi, 2, uint16_t)
1011 ASAN_BUS_SET_FUNC(region, 2, uint16_t)
1012 ASAN_BUS_SET_FUNC(multi_stream, 2, uint16_t)
1013 ASAN_BUS_SET_FUNC(region_stream, 2, uint16_t)
1015 ASAN_BUS_SET_FUNC(multi, 4, uint32_t)
1016 ASAN_BUS_SET_FUNC(region, 4, uint32_t)
1017 ASAN_BUS_SET_FUNC(multi_stream, 4, uint32_t)
1018 ASAN_BUS_SET_FUNC(region_stream, 4, uint32_t)
1020 /* -------------------------------------------------------------------------- */
1022 void __asan_register_globals(struct __asan_global *, size_t);
1023 void __asan_unregister_globals(struct __asan_global *, size_t);
1026 __asan_register_globals(struct __asan_global *globals, size_t n)
1030 for (i = 0; i < n; i++) {
1031 kasan_mark(globals[i].beg, globals[i].size,
1032 globals[i].size_with_redzone, KASAN_GENERIC_REDZONE);
1037 __asan_unregister_globals(struct __asan_global *globals, size_t n)
1041 for (i = 0; i < n; i++) {
1042 kasan_mark(globals[i].beg, globals[i].size_with_redzone,
1043 globals[i].size_with_redzone, 0);
1047 #define ASAN_LOAD_STORE(size) \
1048 void __asan_load##size(unsigned long); \
1049 void __asan_load##size(unsigned long addr) \
1051 kasan_shadow_check(addr, size, false, __RET_ADDR);\
1053 void __asan_load##size##_noabort(unsigned long); \
1054 void __asan_load##size##_noabort(unsigned long addr) \
1056 kasan_shadow_check(addr, size, false, __RET_ADDR);\
1058 void __asan_store##size(unsigned long); \
1059 void __asan_store##size(unsigned long addr) \
1061 kasan_shadow_check(addr, size, true, __RET_ADDR);\
1063 void __asan_store##size##_noabort(unsigned long); \
1064 void __asan_store##size##_noabort(unsigned long addr) \
1066 kasan_shadow_check(addr, size, true, __RET_ADDR);\
1073 ASAN_LOAD_STORE(16);
1075 void __asan_loadN(unsigned long, size_t);
1076 void __asan_loadN_noabort(unsigned long, size_t);
1077 void __asan_storeN(unsigned long, size_t);
1078 void __asan_storeN_noabort(unsigned long, size_t);
1079 void __asan_handle_no_return(void);
1082 __asan_loadN(unsigned long addr, size_t size)
1084 kasan_shadow_check(addr, size, false, __RET_ADDR);
1088 __asan_loadN_noabort(unsigned long addr, size_t size)
1090 kasan_shadow_check(addr, size, false, __RET_ADDR);
1094 __asan_storeN(unsigned long addr, size_t size)
1096 kasan_shadow_check(addr, size, true, __RET_ADDR);
1100 __asan_storeN_noabort(unsigned long addr, size_t size)
1102 kasan_shadow_check(addr, size, true, __RET_ADDR);
1106 __asan_handle_no_return(void)
1111 #define ASAN_SET_SHADOW(byte) \
1112 void __asan_set_shadow_##byte(void *, size_t); \
1113 void __asan_set_shadow_##byte(void *addr, size_t size) \
1115 __builtin_memset((void *)addr, 0x##byte, size); \
1118 ASAN_SET_SHADOW(00);
1119 ASAN_SET_SHADOW(f1);
1120 ASAN_SET_SHADOW(f2);
1121 ASAN_SET_SHADOW(f3);
1122 ASAN_SET_SHADOW(f5);
1123 ASAN_SET_SHADOW(f8);
1125 void __asan_poison_stack_memory(const void *, size_t);
1126 void __asan_unpoison_stack_memory(const void *, size_t);
1129 __asan_poison_stack_memory(const void *addr, size_t size)
1131 size = roundup(size, KASAN_SHADOW_SCALE);
1132 kasan_shadow_Nbyte_fill(addr, size, KASAN_USE_AFTER_SCOPE);
1136 __asan_unpoison_stack_memory(const void *addr, size_t size)
1138 kasan_shadow_Nbyte_markvalid(addr, size);
1141 void __asan_alloca_poison(const void *, size_t);
1142 void __asan_allocas_unpoison(const void *, const void *);
1145 __asan_alloca_poison(const void *addr, size_t size)
1149 KASSERT((vm_offset_t)addr % KASAN_ALLOCA_SCALE_SIZE == 0,
1150 ("%s: invalid address %p", __func__, addr));
1152 l = (const uint8_t *)addr - KASAN_ALLOCA_SCALE_SIZE;
1153 r = (const uint8_t *)addr + roundup(size, KASAN_ALLOCA_SCALE_SIZE);
1155 kasan_shadow_Nbyte_fill(l, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_LEFT);
1156 kasan_mark(addr, size, roundup(size, KASAN_ALLOCA_SCALE_SIZE),
1158 kasan_shadow_Nbyte_fill(r, KASAN_ALLOCA_SCALE_SIZE, KASAN_STACK_RIGHT);
1162 __asan_allocas_unpoison(const void *stkbegin, const void *stkend)
1166 if (__predict_false(!stkbegin))
1168 if (__predict_false((uintptr_t)stkbegin > (uintptr_t)stkend))
1170 size = (uintptr_t)stkend - (uintptr_t)stkbegin;
1172 kasan_shadow_Nbyte_fill(stkbegin, size, 0);
1175 void __asan_poison_memory_region(const void *addr, size_t size);
1176 void __asan_unpoison_memory_region(const void *addr, size_t size);
1179 __asan_poison_memory_region(const void *addr, size_t size)
1184 __asan_unpoison_memory_region(const void *addr, size_t size)