# \[PATCH 26/35\] kasan, arm64: Enable TBI EL1 - From: Andrey Konovalov \ - Date: 2020-08-14 17:29:48 - List: linux-arm-kernel - Page: https://ratatoskr.run/linux-arm-kernel/2020/08/6068785 - Thread: https://ratatoskr.run/linux-arm-kernel/2020/08/6068760/t.md ```text From: Vincenzo Frascino Hardware tag-based KASAN relies on Memory Tagging Extension (MTE) that is built on top of the Top Byte Ignore (TBI) feature. Enable in-kernel TBI when CONFIG_KASAN_HW_TAGS is turned on by enabling the TCR_TBI1 bit in proc.S. Signed-off-by: Vincenzo Frascino --- arch/arm64/mm/proc.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index 152d74f2cc9c..6880ddaa5144 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -38,7 +38,7 @@ /* PTWs cacheable, inner/outer WBWA */ #define TCR_CACHE_FLAGS TCR_IRGN_WBWA | TCR_ORGN_WBWA -#ifdef CONFIG_KASAN_SW_TAGS +#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) #define TCR_KASAN_FLAGS TCR_TBI1 #else #define TCR_KASAN_FLAGS 0 -- 2.28.0.220.ged08abb693-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ```