linux-kernel - Re: [PATCH 2/2] efi: Validate UEFI boot variables

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Message-ID: <20120216142728.64ed46e7@pyramind.ukuu.org.uk>
Date:	Thu, 16 Feb 2012 14:27:28 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, hpa@...or.com,
	stable@...nel.org
Subject: Re: [PATCH 2/2] efi: Validate UEFI boot variables

On Thu, 16 Feb 2012 08:58:37 -0500
Matthew Garrett <mjg@...hat.com> wrote:

> A common flaw in UEFI systems is a refusal to POST triggered by a malformed
> boot variable. Once in this state, machines may only be restored by
> reflashing their firmware with an external hardware device. While this is
> obviously a firmware bug, the serious nature of the outcome suggests that
> operating systems should filter their variable writes in order to prevent
> a malicious user from rendering the machine unusable.
> 
> Signed-off-by: Matthew Garrett <mjg@...hat.com>

Other than pr_err() as a nitpick comemnt this looks good to me

Acked-by: Alan Cox <alan@...ux.intel.com>
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