f8ce5f5926
(Upstream commit 3c9e3aa11094e821aff4a8f6812a6e032293dbc0). This commit adds a few helper functions, that are meant to be used to work with tags embedded in the top byte of kernel pointers: to set, to get or to reset the top byte. Link: http://lkml.kernel.org/r/f6c6437bb8e143bc44f42c3c259c62e734be7935.1544099024.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Christoph Lameter <cl@linux.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Bug: 128674696 Change-Id: I6a46eb172205fe869d126ae296f64d44e007ac88
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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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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#include <linux/linkage.h>
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#include <asm/memory.h>
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#include <asm/pgtable-types.h>
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#define arch_kasan_set_tag(addr, tag) __tag_set(addr, tag)
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#define arch_kasan_reset_tag(addr) __tag_reset(addr)
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#define arch_kasan_get_tag(addr) __tag_get(addr)
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#ifdef CONFIG_KASAN
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/*
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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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#define KASAN_SHADOW_START (VA_START)
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#define KASAN_SHADOW_END (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
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/*
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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_OFFSET (KASAN_SHADOW_END - (1ULL << \
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(64 - KASAN_SHADOW_SCALE_SHIFT)))
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void kasan_init(void);
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void kasan_copy_shadow(pgd_t *pgdir);
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asmlinkage void kasan_early_init(void);
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#else
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static inline void kasan_init(void) { }
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static inline void kasan_copy_shadow(pgd_t *pgdir) { }
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#endif
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#endif
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#endif
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