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Date:   Sat, 2 Mar 2019 10:29:28 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>, ashok.raj@...el.com,
        jacob.jun.pan@...el.com, kevin.tian@...el.com, yi.l.liu@...el.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH 1/4] iommu/vt-d: Disable ATS support on untrusted devices

On Fri, Mar 01, 2019 at 11:23:10AM +0800, Lu Baolu wrote:
> Commit fb58fdcd295b9 ("iommu/vt-d: Do not enable ATS for untrusted
> devices") disables ATS support on the devices which have been marked
> as untrusted. Unfortunately this is not enough to fix the DMA attack
> vulnerabiltiies because IOMMU driver allows translated requests as
> long as a device advertises the ATS capability. Hence a malicious
> peripheral device could use this to bypass IOMMU.
> 
> This disables the ATS support on untrusted devices by clearing the
> internal per-device ATS mark. As the result, IOMMU driver will block
> any translated requests from any device marked as untrusted.
> 
> Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

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