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SubjectRe: [PATCH V32 19/27] x86/mmiotrace: Lock down the testmmiotrace module
On Wed, 3 Apr 2019, Matthew Garrett wrote:

> From: David Howells <>
> 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 <>
> Signed-off-by: David Howells <
> Signed-off-by: Matthew Garrett <>

Reviewed-by: Thomas Gleixner <>

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