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LoongArch: Make KASAN usable for variable cpu_vabits 

commit 3c252263be801f937f56b4bcd8e8e2b5307c1ce5 upstream.

Currently, KASAN on LoongArch assume the CPU VA bits is 48, which is
true for Loongson-3 series, but not for Loongson-2 series (only 40 or
lower), this patch fix that issue and make KASAN usable for variable
cpu_vabits.

Solution is very simple: Just define XRANGE_SHADOW_SHIFT which means
valid address length from VA_BITS to min(cpu_vabits, VA_BITS).

Cc: stable@vger.kernel.org
Signed-off-by: Kanglong Wang <wangkanglong@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huacai Chen 2024-10-23 22:15:30 +08:00 committed by Greg Kroah-Hartman
parent 8915ed160d
commit 36bd0f386b
1 changed files with 1 additions and 1 deletions
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2
arch/loongarch/include/asm/kasan.h
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@ -16,7 +16,7 @@
#define XRANGE_SHIFT (48) #define XRANGE_SHIFT (48)
/* Valid address length */ /* Valid address length */
#define XRANGE_SHADOW_SHIFT (PGDIR_SHIFT + PAGE_SHIFT - 3) #define XRANGE_SHADOW_SHIFT min(cpu_vabits, VA_BITS)
/* Used for taking out the valid address */ /* Used for taking out the valid address */
#define XRANGE_SHADOW_MASK GENMASK_ULL(XRANGE_SHADOW_SHIFT - 1, 0) #define XRANGE_SHADOW_MASK GENMASK_ULL(XRANGE_SHADOW_SHIFT - 1, 0)
/* One segment whole address space size */ /* One segment whole address space size */