From: Vladimir Murzin <vladimir.murzin@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: catalin.marinas@arm.com, will@kernel.org, yeoreum.yun@arm.com
Subject: [PATCH] arm64: process: Fix context switching MTE store-only tag check
Date: Wed, 19 Aug 2026 15:48:59 +0100 [thread overview]
Message-ID: <20260819144859.5447-1-vladimir.murzin@arm.com> (raw)
SCTLR_EL1.TCSO0 is set when user opt-in for MTE store-only tag check
mode. However, it is not part of SCTLR_USER_MASK which imply that on
context switch we never clear SCTLR_EL1.TCSO0, so we are leaking that
setting into another task.
Fix that by including SCTLR_EL1_TCSO0_MASK into SCTLR_USER_MASK
Fixes: 4d51ff5bba00 ("arm64/kernel: Support store-only mte tag check")
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
---
arch/arm64/include/asm/processor.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index c2a627f39314..6dfbcacd9ba0 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -264,7 +264,7 @@ static inline void task_set_sve_vl_onexec(struct task_struct *task,
#define SCTLR_USER_MASK \
(SCTLR_ELx_ENIA | SCTLR_ELx_ENIB | SCTLR_ELx_ENDA | SCTLR_ELx_ENDB | \
- SCTLR_EL1_TCF0_MASK)
+ SCTLR_EL1_TCF0_MASK | SCTLR_EL1_TCSO0_MASK)
static inline void arch_thread_struct_whitelist(unsigned long *offset,
unsigned long *size)
--
2.34.1
next reply other threads:[~2026-08-19 14:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-19 14:48 Vladimir Murzin [this message]
2026-08-19 15:24 ` [PATCH] arm64: process: Fix context switching MTE store-only tag check Yeoreum Yun
2026-08-19 15:44 ` Catalin Marinas
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