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

[Yeoreum Yun]

> 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

Oops, Sorry for this.

Reviewed-by: Yeoreum Yun <yeoreum.yun at arm.com>
-- 
Sincerely,
Yeoreum Yun