[PATCH V32 19/27] x86/mmiotrace: Lock down the testmmiotrace module

[Thomas Gleixner]

On Wed, 3 Apr 2019, Matthew Garrett wrote:

> From: David Howells <dhowells at redhat.com>
> 
> The testmmiotrace module shouldn't be permitted when the kernel is locked
> down as it can be used to arbitrarily read and write MMIO space. This is
> a runtime check rather than buildtime in order to allow configurations
> where the same kernel may be run in both locked down or permissive modes
> depending on local policy.
> 
> Suggested-by: Thomas Gleixner <tglx at linutronix.de>
> Signed-off-by: David Howells <dhowells at redhat.com
> Signed-off-by: Matthew Garrett <mjg59 at google.com>

Reviewed-by: Thomas Gleixner <tglx at linutronix.de>