linux-kernel - Re: [PATCH V3 08/11] kexec: Disable at runtime if the kernel enforces module loading restrictions

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Message-ID: <1378325529.13193.8.camel@x230>
Date:	Wed, 4 Sep 2013 20:12:09 +0000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	"jerry.hoemann@...com" <jerry.hoemann@...com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"hpa@...or.com" <hpa@...or.com>, kexec <kexec@...ts.infradead.org>,
	"vgoyal@...hat.com" <vgoyal@...hat.com>
Subject: Re: [PATCH V3 08/11] kexec: Disable at runtime if the kernel
 enforces module loading restrictions

On Wed, 2013-09-04 at 14:09 -0600, jerry.hoemann@...com wrote:
> On Tue, Sep 03, 2013 at 07:50:15PM -0400, Matthew Garrett wrote:
> > kexec permits the loading and execution of arbitrary code in ring 0, which
> > is something that module signing enforcement is meant to prevent. It makes
> > sense to disable kexec in this situation.
> > 
> > Signed-off-by: Matthew Garrett <matthew.garrett@...ula.com>
> 
> 
> Matthew,
> 
> Disabling kexec will disable kdump, correct?

Yes.

> Are there plans to enable kdump on a system where secure
> boot is enabled?

Yes, Vivek Goyal (cc:ed) is working on that.

-- 
Matthew Garrett <matthew.garrett@...ula.com>