Re: [PATCH 26/35] kasan, arm64: Enable TBI EL1
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2020-08-27 15:23:02
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On Thu, Aug 27, 2020 at 12:05:55PM +0100, Vincenzo Frascino wrote:
On 8/27/20 11:40 AM, Catalin Marinas wrote:quoted
On Fri, Aug 14, 2020 at 07:27:08PM +0200, Andrey Konovalov wrote:quoted
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 0I prefer to turn TBI1 on only if MTE is present. So on top of the v8 user series, just do this in __cpu_setup.Not sure I understand... Enabling TBI1 only if MTE is present would break KASAN_SW_TAGS which is based on TBI1 but not on MTE.
You keep the KASAN_SW_TAGS as above but for HW_TAGS, only set TBI1 later in __cpu_setup(). -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel