linux-kernel - Re: [PATCH] Fix kexec forbidding kernels signed with custom platform keys to boot

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Message-ID: <CA+55aFzRHVXP4Ag4aygao1dTGaaMJZSOisHT2ks3_WP97kLLhQ@mail.gmail.com>
Date:   Wed, 15 Aug 2018 13:47:29 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Vivek Goyal <vgoyal@...hat.com>
Cc:     yannik@...britzki.me, David Howells <dhowells@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Peter Anvin <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dave Young <dyoung@...hat.com>, Baoquan He <bhe@...hat.com>,
        Justin Forbes <jforbes@...hat.com>,
        Peter Jones <pjones@...hat.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Matthew Garrett <mjg59@...gle.com>
Subject: Re: [PATCH] Fix kexec forbidding kernels signed with custom platform
 keys to boot

On Wed, Aug 15, 2018 at 12:49 PM Vivek Goyal <vgoyal@...hat.com> wrote:
>
> I see that module signing code trusts only builtin keys and
> not the keys in secondary_trusted_keys keyring.

This, I think, makes sense.

It basically says: we don't allow modules that weren't built with the
kernel. Adding a new key later and signing a module with it violates
that premise.

                  Linus