linux-kernel - Re: Should we automatically generate a module signing key at all?

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Message-ID: <4896.1432059008@warthog.procyon.org.uk>
Date:	Tue, 19 May 2015 19:10:08 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	dhowells@...hat.com, Andy Lutomirski <luto@...capital.net>,
	Andy Lutomirski <luto@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michal Marek <mmarek@...e.cz>,
	David Woodhouse <dwmw2@...radead.org>,
	Abelardo Ricart III <aricart@...nix.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Sedat Dilek <sedat.dilek@...il.com>, keyrings@...ux-nfs.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	LSM List <linux-security-module@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>
Subject: Re: Should we automatically generate a module signing key at all?

Theodore Ts'o <tytso@....edu> wrote:

> Oh, so you are generating a one-time key for each kernel build,

Yes.

> and then dropping the public key into a cert which is then signed by some
> trusted CA system?

No.  We compile the public key into the vmlinux binary and leave it at that.
Trying to automatically sign the key would expose the signing key through the
buildfarm.

David
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