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LoongArch: Make KASAN usable for variable cpu_vabits

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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>
This commit is contained in:
Huacai Chen
2024-10-23 22:15:30 +08:00
parent d2f8671045
commit 3c252263be
1 changed files with 1 additions and 1 deletions
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arch/loongarch/include/asm/kasan.h
+1 -1
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@@ -16,7 +16,7 @@
#define XRANGE_SHIFT (48)
/* 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 */
#define XRANGE_SHADOW_MASK GENMASK_ULL(XRANGE_SHADOW_SHIFT - 1, 0)
/* One segment whole address space size */