From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from cavan.codon.org.uk ([2a00:1098:0:80:1000:c:0:1]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VUjfv-0007Jw-Fh for kexec@lists.infradead.org; Fri, 11 Oct 2013 20:51:08 +0000 Date: Fri, 11 Oct 2013 21:50:16 +0100 From: Matthew Garrett Subject: Re: kexec: Clearing registers just before jumping into purgatory Message-ID: <20131011205016.GA5656@srcf.ucam.org> References: <20131011154805.GB30181@srcf.ucam.org> <20131011163933.GA31941@srcf.ucam.org> <20131011164400.GA32133@srcf.ucam.org> <52582B97.2060907@nod.at> <20131011165542.GB32133@srcf.ucam.org> <52582E7D.8080909@nod.at> <20131011170138.GA32619@srcf.ucam.org> <87ob6va670.fsf@tw-ebiederman.twitter.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87ob6va670.fsf@tw-ebiederman.twitter.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: "Eric W. Biederman" Cc: keir@xen.org, Kees Cook , Richard Weinberger , Richard Weinberger , Daniel Kiper , kexec@lists.infradead.org, LKML , xen-devel@lists.xen.org, hbabu@us.ibm.com, david.vrabel@citrix.com, jbeulich@suse.com, "H. Peter Anvin" , Vivek Goyal On Fri, Oct 11, 2013 at 01:44:19PM -0700, Eric W. Biederman wrote: > Matthew Garrett writes: > > No, I manually look up some addresses from /proc/kallsyms and then > > modify them in the second kernel. > > An interesting approach I think most of the rest of us would have just > built a module, or rebuilt our kernels. Well yeah, but my kernel refuses to load unsigned modules, so. > Now if this is a backwards argument to remove that silly code path it > totally fails because now we know the code has not bit-rotted and > that there are active users. No, it's not any argument of the kind. > If you are still pushing the signed-boot agenda I eagerly await your > patches to make all of this work in a sensible way with signed binaries. Vivek's working on a separate kexec system call for that, as we agreed with Linus at LPC. -- Matthew Garrett | mjg59@srcf.ucam.org _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec