linux-kernel - Re: [PATCH 1/2] x86: Fix kernel panic when booting with XD disabled in uEFI firmware

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Date:	Tue, 8 Dec 2015 21:56:05 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Kees Cook <keescook@...omium.org>
Cc:	Matt Fleming <matt@...eblueprint.co.uk>,
	Kosuke Tatsukawa <tatsu@...jp.nec.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] x86: Fix kernel panic when booting with XD disabled
 in uEFI firmware

On Tue, Dec 08, 2015 at 12:30:06PM -0800, Kees Cook wrote:
> If we add this for not-nx, I would like to add it for not-rodata too.

The W+X thing?

I was under the impression we want to fix all those so that the ptdump
check doesn't fire anymore.

> I've never seen anyone actually use it. I was asked to include it out
> of fear of some kind of rogue imagined CPU configuration that mixed NX
> and non-NX capable CPUs in a single machine where the forced NX
> re-enablement code would cause problems. As you might imagine, I'm not
> aware of this case ever being an issue. ;)

Right. :)

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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