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

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Message-ID: <CA+5PVA6HayQJEDFisvXYJKyoKDbJh53fWki=Arbn_9t=NppGrw@mail.gmail.com>
Date:	Wed, 4 Sep 2013 16:14:00 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	jerry.hoemann@...com
Cc:	Matthew Garrett <matthew.garrett@...ula.com>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	kexec <kexec@...ts.infradead.org>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH V3 08/11] kexec: Disable at runtime if the kernel enforces
 module loading restrictions

On Wed, Sep 4, 2013 at 4:09 PM,  <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?

Vivek Goyal has been working on this.  I've not seen the code yet, but
I believe it should be posted somewhere relatively soon.  We're also
planning on talking about it at the Secure Boot microconference at
Linux Plumbers in two weeks.

josh
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