linux-kernel - Re: [PATCH v5 04/10] KVM: arm/arm64: vgic-its: Check GITS

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Message-ID: <86tvyneeyt.fsf@arm.com>
Date:   Wed, 25 Oct 2017 10:47:38 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     <eric.auger.pro@...il.com>, <linux-kernel@...r.kernel.org>,
        <kvm@...r.kernel.org>, <kvmarm@...ts.cs.columbia.edu>,
        <cdall@...aro.org>, <peter.maydell@...aro.org>,
        <andre.przywara@....com>, <wanghaibin.wang@...wei.com>,
        <wu.wubin@...wei.com>, <drjones@...hat.com>, <wei@...hat.com>
Subject: Re: [PATCH v5 04/10] KVM: arm/arm64: vgic-its: Check GITS_BASER Valid bit before saving tables

On Mon, Oct 23 2017 at  4:08:23 pm BST, Eric Auger <eric.auger@...hat.com> wrote:
> At the moment we don't properly check the GITS_BASER<n>.Valid
> bit before saving the collection and device tables.
>
> On vgic_its_save_collection_table() we use the GITS_BASER gpa
> field whereas the Valid bit should be used.
>
> On vgic_its_save_device_tables() there is no check. This can
> cause various bugs, among which a subsequent fault when accessing
> the table in guest memory.
>
> Let's systematically check the Valid bit before doing anything.
>
> We also uniformize the code between save and restore.
>
> Signed-off-by: Eric Auger <eric.auger@...hat.com>
> Reviewed-by: Andre Przywara <andre.przywara@....com>
> Reviewed-by: Christoffer Dall <christoffer.dall@...aro.org>

Reviewed-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
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