Re: [PATCH V33 21/30] x86/mmiotrace: Lock down the testmmiotrace module

[Steven Rostedt]

On Thu, 20 Jun 2019 18:19:32 -0700
Matthew Garrett <matthewgarrett@xxxxxxxxxx> wrote:

> From: David Howells <dhowells@xxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxx>
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx
> Signed-off-by: Matthew Garrett <mjg59@xxxxxxxxxx>
> cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>

-- Steve

> cc: Ingo Molnar <mingo@xxxxxxxxxx>
> cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> cc: x86@xxxxxxxxxx
> ---