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SubjectRe: [RFC] Second attempt at kernel secure boot support
At Wed, 31 Oct 2012 17:37:28 +0000,
Matthew Garrett wrote:
>
> On Wed, Oct 31, 2012 at 06:28:16PM +0100, Takashi Iwai wrote:
>
> > request_firmware() is used for microcode loading, too, so it's fairly
> > a core part to cover, I'm afraid.
> >
> > I played a bit about this yesterday. The patch below is a proof of
> > concept to (ab)use the module signing mechanism for firmware loading
> > too. Sign firmware files via scripts/sign-file, and put to
> > /lib/firmware/signed directory.
>
> That does still leave me a little uneasy as far as the microcode
> licenses go. I don't know that we can distribute signed copies of some
> of them, and we obviously can't sign at the user end.

Yeah, that's a concern. Although this is a sort of "container" and
keeping the original data as is, it might be regarded as a
modification.

Another approach would be to a signature in a separate file, but I'm
not sure whether it makes sense.


Takashi


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