include/asm/kasan.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef __ASM_KASAN_H
0003 #define __ASM_KASAN_H
0004
0005 #ifndef __ASSEMBLY__
0006
0007 #include <linux/linkage.h>
0008 #include <asm/memory.h>
0009 #include <asm/mte-kasan.h>
0010 #include <asm/pgtable-types.h>
0011
0012 #define arch_kasan_set_tag(addr, tag)   __tag_set(addr, tag)
0013 #define arch_kasan_reset_tag(addr)  __tag_reset(addr)
0014 #define arch_kasan_get_tag(addr)    __tag_get(addr)
0015
0016 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
0017
0018 void kasan_init(void);
0019
0020 /*
0021  * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
0022  * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
0023  * where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
0024  *
0025  * KASAN_SHADOW_OFFSET:
0026  * This value is used to map an address to the corresponding shadow
0027  * address by the following formula:
0028  *     shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
0029  *
0030  * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
0031  * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
0032  * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
0033  *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
0034  *              (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
0035  */
0036 #define _KASAN_SHADOW_START(va) (KASAN_SHADOW_END - (1UL << ((va) - KASAN_SHADOW_SCALE_SHIFT)))
0037 #define KASAN_SHADOW_START      _KASAN_SHADOW_START(vabits_actual)
0038
0039 void kasan_copy_shadow(pgd_t *pgdir);
0040 asmlinkage void kasan_early_init(void);
0041
0042 #else
0043 static inline void kasan_init(void) { }
0044 static inline void kasan_copy_shadow(pgd_t *pgdir) { }
0045 #endif
0046
0047 #endif
0048 #endif