On Mon, Apr 19, 2021 at 11:28:49AM +0100, Catalin Marinas wrote:
> commit 2decad92f4731fac9755a083fcfefa66edb7d67d upstream.
>
> The entry from EL0 code checks the TFSRE0_EL1 register for any
> asynchronous tag check faults in user space and sets the
> TIF_MTE_ASYNC_FAULT flag. This is not done atomically, potentially
> racing with another CPU calling set_tsk_thread_flag().
>
> Replace the non-atomic ORR+STR with an STSET instruction. While STSET
> requires ARMv8.1 and an assembler that understands LSE atomics, the MTE
> feature is part of ARMv8.5 and already requires an updated assembler.
>
> Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> Fixes: 637ec831ea4f ("arm64: mte: Handle synchronous and asynchronous tag check faults")
> Cc: <stable@xxxxxxxxxxxxxxx> # 5.10.x
Thanks, now queued up.
greg k-h
