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SubjectRe: [PATCH V31 25/25] debugfs: Disable open() when kernel is locked down
On Tue, Mar 26, 2019 at 11:28 AM Matthew Garrett
<matthewgarrett@google.com> wrote:
>
> From: Matthew Garrett <mjg59@google.com>
>
> debugfs has not been meaningfully audited in terms of ensuring that
> userland cannot trample over the kernel. At Greg's request, disable
> access to it entirely when the kernel is locked down. This is done at
> open() time rather than init time as the kernel lockdown status may be
> made stricter at runtime.

Ugh. Some of those files are very useful. Could this perhaps still
allow O_RDONLY if we're in INTEGRITY mode?

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