linux-kernel - Re: [PATCH 03/11] x86: Lock down IO port access in secure boot environments

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Message-ID: <20120904171603.3ccb5891@pyramind.ukuu.org.uk>
Date:	Tue, 4 Sep 2012 17:16:03 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org
Subject: Re: [PATCH 03/11] x86: Lock down IO port access in secure boot
 environments

On Tue,  4 Sep 2012 11:55:09 -0400
Matthew Garrett <mjg@...hat.com> wrote:

> IO port access would permit users to gain access to PCI configuration
> registers, which in turn (on a lot of hardware) give access to MMIO register
> space. This would potentially permit root to trigger arbitrary DMA, so lock
> it down by default.

You've missed a load of others, all over the kernel, let alone getting
into devices with other paths to firmware reprogramming of which there
are many.

You need to enforce signing on request_firmware for example, and sign
every firmware.


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