On Wed, Aug 21, 2024 at 09:50:22AM +0100, Catalin Marinas wrote: > On Tue, Aug 20, 2024 at 06:56:19PM +0100, Mark Brown wrote:
> > I forgot when writing the above that we always allow reads from > > GCSPR_EL0 in order to avoid corner cases for unwinders in the case of > > asynchronous disable. I'd expect that to be cheap to access though. > But then gcs_preserve_current_state() doesn't save the GCSPR_EL0 value > if the shadow stack was disabled. At the subsequent switch to this task, > we write some stale value. True, we should make the disable save the current value.
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