linux-kernel - Re: [PATCH 13/24] x86: Lock down IO port access when the kernel is locked down

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Message-ID: <alpine.DEB.2.20.1704142028170.2327@nanos>
Date:   Fri, 14 Apr 2017 20:28:39 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     David Howells <dhowells@...hat.com>
cc:     linux-kernel@...r.kernel.org, matthew.garrett@...ula.com,
        linux-efi@...r.kernel.org, gnomes@...rguk.ukuu.org.uk,
        gregkh@...uxfoundation.org, x86@...nel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org
Subject: Re: [PATCH 13/24] x86: Lock down IO port access when the kernel is
 locked down

On Wed, 5 Apr 2017, David Howells wrote:
> From: Matthew Garrett <matthew.garrett@...ula.com>
> 
> 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.
> 
> This also implicitly locks down the KDADDIO, KDDELIO, KDENABIO and
> KDDISABIO console ioctls.
> 
> Signed-off-by: Matthew Garrett <matthew.garrett@...ula.com>
> Signed-off-by: David Howells <dhowells@...hat.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>