[PATCH] arm64: process: Fix context switching MTE store-only tag check

[Vladimir Murzin]

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 at 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