54c5639d8f
Nathan reported that because KASAN_SHADOW_OFFSET was not defined in
Kconfig, it prevents asan-stack from getting disabled with clang even
when CONFIG_KASAN_STACK is disabled: fix this by defining the
corresponding config.
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Fixes: 8ad8b72721 ("riscv: Add KASAN support")
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
41 lines
1.4 KiB
C
41 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 KERN_VIRT_START
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#define KASAN_SHADOW_END (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
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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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