Re: [PATCHv7 0/3] Kernel Live Patching

[Vojtech Pavlik]

On Wed, Dec 17, 2014 at 01:22:21PM +0530, Balbir Singh wrote:
> On Wed, Dec 17, 2014 at 12:16 PM, Jiri Kosina <jkosina@xxxxxxx> wrote:
> > On Wed, 17 Dec 2014, Balbir Singh wrote:
> >
> >> >> Could you describe what this does to signing? I presume the patched
> >> >> module should cause a taint on module signing?
> >> >
> >> > Hmm, why should it?
> >>
> >> I wanted to clarify it from a different perspective
> >>
> >> If the base image is signed by X and the patched module is signed by
> >> Y, is that supported. What does it imply in the case of live-patching?
> >
> > Why should that matter? Both are signed by keys that kernel is configured
> > to trust, which makes them equal (even though they are technically
> > different).
> >
> 
> I am not sure they are equal, others can comment

Since any loaded kernel module can do virtually anything on a machine,
there can only be one level of trust. As such, all trusted keys are
equally trusted.

-- 
Vojtech Pavlik
Director SUSE Labs
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