linux-kernel - Re: [PATCH V31 11/25] x86: Lock down IO port access when the kernel is locked down

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Message-ID: <CALCETrVjhHbJ+41fY9ra7YBm42ingOZ0_XjY=xAxLUU8n0U=9Q@mail.gmail.com>
Date:   Tue, 26 Mar 2019 13:56:49 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Matthew Garrett <matthewgarrett@...gle.com>
Cc:     James Morris <jmorris@...ei.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        Linux API <linux-api@...r.kernel.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Matthew Garrett <mjg59@...gle.com>, X86 ML <x86@...nel.org>
Subject: Re: [PATCH V31 11/25] x86: Lock down IO port access when the kernel
 is locked down

On Tue, Mar 26, 2019 at 11:28 AM Matthew Garrett
<matthewgarrett@...gle.com> wrote:
>
> From: Matthew Garrett <mjg59@...f.ucam.org>
>
> 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.
>

Reviewed-by: Andy Lutomirski <luto@...nel.org>