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Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/include/asm/kasan.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kasan.h b/arch/arm64/include/asm/kasan.h new file mode 100644 index 000000000..b0dc4abc3 --- /dev/null +++ b/arch/arm64/include/asm/kasan.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_KASAN_H +#define __ASM_KASAN_H + +#ifndef __ASSEMBLY__ + +#include <linux/linkage.h> +#include <asm/memory.h> +#include <asm/pgtable-types.h> + +#define arch_kasan_set_tag(addr, tag) __tag_set(addr, tag) +#define arch_kasan_reset_tag(addr) __tag_reset(addr) +#define arch_kasan_get_tag(addr) __tag_get(addr) + +#ifdef CONFIG_KASAN + +/* + * KASAN_SHADOW_START: beginning of the kernel virtual addresses. + * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses, + * where N = (1 << KASAN_SHADOW_SCALE_SHIFT). + * + * KASAN_SHADOW_OFFSET: + * This value is used to map an address to the corresponding shadow + * address by the following formula: + * shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET + * + * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range + * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual + * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation: + * KASAN_SHADOW_OFFSET = KASAN_SHADOW_END - + * (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT)) + */ +#define _KASAN_SHADOW_START(va) (KASAN_SHADOW_END - (1UL << ((va) - KASAN_SHADOW_SCALE_SHIFT))) +#define KASAN_SHADOW_START _KASAN_SHADOW_START(vabits_actual) + +void kasan_init(void); +void kasan_copy_shadow(pgd_t *pgdir); +asmlinkage void kasan_early_init(void); + +#else +static inline void kasan_init(void) { } +static inline void kasan_copy_shadow(pgd_t *pgdir) { } +#endif + +#endif +#endif |