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f7ae02333d
Now that KASAN_SHADOW_OFFSET is defined at compile time as a config, this value must remain constant whatever the size of the virtual address space, which is only possible by pushing this region at the end of the address space next to the kernel mapping. Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2019 Andes Technology Corporation */
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#ifndef __ASM_KASAN_H
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#define __ASM_KASAN_H
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_KASAN
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/*
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* The following comment was copied from arm64:
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* KASAN_SHADOW_START: beginning of the kernel virtual addresses.
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* KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
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* where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
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*
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* KASAN_SHADOW_OFFSET:
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* This value is used to map an address to the corresponding shadow
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* address by the following formula:
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* shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
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*
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* (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
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* [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
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* addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
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* KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
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* (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
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*/
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#define KASAN_SHADOW_SCALE_SHIFT 3
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#define KASAN_SHADOW_SIZE (UL(1) << ((CONFIG_VA_BITS - 1) - KASAN_SHADOW_SCALE_SHIFT))
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#define KASAN_SHADOW_START (KASAN_SHADOW_END - KASAN_SHADOW_SIZE)
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#define KASAN_SHADOW_END MODULES_LOWEST_VADDR
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#define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
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void kasan_init(void);
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asmlinkage void kasan_early_init(void);
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#endif
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#endif
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#endif /* __ASM_KASAN_H */
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