linux-kernel - Re: [PATCH 0/2] kvm: Lock down device assignment

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Date:	Tue, 20 Dec 2011 11:23:06 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	jan.kiszka@...mens.com
Subject: Re: [PATCH 0/2] kvm: Lock down device assignment

On 12/20/2011 05:19 AM, Alex Williamson wrote:
> Two patches to try to better secure the device assignment ioctl.
> This firt patch makes KVM_DEV_ASSIGN_ENABLE_IOMMU a mandatory
> option when assigning a device.  I don't believe we have any
> users of this option, so I think we can skip any deprecation
> period, especially since it's existence is rather dangerous.
>
> The second patch introduces some file permission checking that Avi
> suggested.  If a user has been granted read/write permission to
> the PCI sysfs BAR resource files, this is a good indication that
> they have access to the device.  We can't call sys_faccessat
> directly (not exported), but the important bits are self contained
> enough to include directly.  This still works with sudo and libvirt
> usage, the latter already grants qemu permission to these files.
> Thanks,
>
>

Looks good, but please update the API documentation.

-- 
error compiling committee.c: too many arguments to function

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