Re: [PATCH v9 30/44] arm64: kasan: Allow enabling in-kernel MTE
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2020-11-12 09:44:01
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On Tue, Nov 10, 2020 at 11:10:27PM +0100, Andrey Konovalov wrote:
From: Vincenzo Frascino <vincenzo.frascino@arm.com> Hardware tag-based KASAN relies on Memory Tagging Extension (MTE) feature and requires it to be enabled. MTE supports This patch adds a new mte_init_tags() helper, that enables MTE in Synchronous mode in EL1 and is intended to be called from KASAN runtime during initialization.
There's no mte_init_tags() in this function.
quoted hunk ↗ jump to hunk
diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c index 600b26d65b41..7f477991a6cf 100644 --- a/arch/arm64/kernel/mte.c +++ b/arch/arm64/kernel/mte.c@@ -129,6 +129,13 @@ void *mte_set_mem_tag_range(void *addr, size_t size, u8 tag) return ptr; } +void mte_enable(void) +{ + /* Enable MTE Sync Mode for EL1. */ + sysreg_clear_set(sctlr_el1, SCTLR_ELx_TCF_MASK, SCTLR_ELx_TCF_SYNC); + isb(); +}
Nitpick: maybe rename this to mte_enable_kernel() since MTE is already enabled for user apps. -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel