From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [PATCH 00/12] One more attempt at useful kernel lockdown Date: Tue, 10 Sep 2013 12:44:15 -0700 Message-ID: <522F768F.1000101@zytor.com> References: <1378767723.17982.27.camel@x230.lan> <1378774394.17982.36.camel@x230.lan> <1378781715.17982.42.camel@x230.lan> <1378785208.17982.54.camel@x230.lan> <20130910172318.GB21530@khazad-dum.debian.net> <1378837571.17615.0.camel@x230.lan> <522F6519.4030004@zytor.com> <20130910185149.GC5559@kroah.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: David Lang Cc: Kees Cook , "gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org" , Matthew Garrett , Henrique de Moraes Holschuh , "Valdis.Kletnieks-PjAqaU27lzQ@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "jmorris-gx6/JNMH7DfYtjvyW6yDsg@public.gmane.org" , "linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-efi@vger.kernel.org On 09/10/2013 12:17 PM, David Lang wrote: >> >> In theory these blobs are traceable to a manufacturer. It's not really >> an indication that it's "safe" more than it's an indication that it >> hasn't been changed. But I haven't chased this very hard yet because >> of below... > > well, not if you are trying to defend against root breaking in to the > machine. > And we have at least some drivers where we even have the firmware in the Linux kernel tree, and thus aren't opaque blobs at all. I suspect we'll need, at some point, a way for vendors that aren't already doing signatures on their firmware in a device-specific way to do so in a kernel-supported way. The easiest (in terms of getting vendors to play along, not necessarily technically) might be a PGP signature (either inline or standalone) and have the public key as part of the driver? -hpa