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kasan, arm64: untag address in _virt_addr_is_linear 

virt_addr_is_linear (which is used by virt_addr_valid) assumes that the
top byte of the address is 0xff, which isn't always the case with
tag-based KASAN.

This patch resets the tag in this macro.

Link: http://lkml.kernel.org/r/df73a37dd5ed37f4deaf77bc718e9f2e590e69b1.1544099024.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2018-12-28 00:30:20 -08:00 committed by Linus Torvalds
parent 3c9e3aa110
commit e71fe3f921
1 changed files with 4 additions and 3 deletions
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7
arch/arm64/include/asm/memory.h
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@ -329,9 +329,10 @@ static inline void *phys_to_virt(phys_addr_t x)
#endif
#endif
#define _virt_addr_is_linear(kaddr) (((u64)(kaddr)) >= PAGE_OFFSET)
#define virt_addr_valid(kaddr) (_virt_addr_is_linear(kaddr) && \
_virt_addr_valid(kaddr))
#define _virt_addr_is_linear(kaddr) \
(__tag_reset((u64)(kaddr)) >= PAGE_OFFSET)
#define virt_addr_valid(kaddr) \
(_virt_addr_is_linear(kaddr) && _virt_addr_valid(kaddr))
#include <asm-generic/memory_model.h>