Re: [PATCH 0/4][RFC v2] Introduce the in-kernel hibernation encryption

Pavel Machek
2018-07-24T12:01:39Z

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Hi!

> > > > "There have some functions be locked-down because
> > > > there have no appropriate mechanisms to check the
> > > > integrity of writing data."
> > > > https://patchwork.kernel.org/patch/10476751/
> > >
> > > So your goal is to make hibernation compatible with kernel
> > > lockdown? Do your patches provide sufficient security that hibernation
> > > can be enabled with kernel lockdown?
> >
> > OK, maybe I am dense, but if the key comes from user space, will that
> > be enough?
> >
> Good point, we once tried to generate key in kernel, but people
> suggest to generate key in userspace and provide it to the
> kernel, which is what ecryptfs do currently, so it seems this
> should also be safe for encryption in kernel.

Safe against what kind of attack? Please describe what kind of
security you are trying to provide.

I don't think generating key in userspace is good enough for providing
guarantees for secure-boot.

Pavel
--
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