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Re: [Qemu-devel] Re: [PATCH 0/4] net-bridge: rootless bridge support for
Michael S. Tsirkin
Re: [Qemu-devel] Re: [PATCH 0/4] net-bridge: rootless bridge support for qemu
Wed, 4 Nov 2009 22:04:23 +0200
On Wed, Nov 04, 2009 at 01:48:01PM -0600, Anthony Liguori wrote:
> Michael S. Tsirkin wrote:
>> On Tue, Nov 03, 2009 at 06:28:01PM -0600, Anthony Liguori wrote:
>>> This series solves a problem that I've been struggling with for a few years
>>> One of the best things about qemu is that it's possible to run guests as an
>>> unprivileged user to improve security. However, if you want to have your
>>> communicate with the outside world, you're pretty much forced to run qemu as
>>> At least with KVM support, this is probably the most common use case which
>>> that most of our users are running qemu as root. That's terrible.
>>> We address this problem by introducing a new network backend: -net bridge.
>>> backend is less flexible than -net tap because it relies on a helper with
>>> elevated privileges to do the heavy lifting of allocating and attaching a
>>> device to a bridge. We use a special purpose helper because we don't want
>>> to elevate the privileges of more generic tools like brctl.
>>> >From a user perspective, to use bridged networking with a guest, you
>>> >simply use:
>>> qemu -hda linux.img -net bridge -net nic
>>> And assuming a bridge is defined named qemubr0 and the administrator has
>>> permissions accordingly, it will Just Work. My hope is that distributions
>>> do this work as part of the qemu packaging process such that for most users,
>>> the out-of-the-box experience will also Just Work.
>>> More details are included in individual patches. I broke up the helper into
>>> a series of patches to improve reviewabilty.
>> Would raw backend attached to a bridge mostly do the same?
> Well it doesn't really help with the issue of privileges which is what
> this series is really about.
> Anthony Liguori
I note that by default you grant all users all access.
If you do that, just give them net cap admin already?
[Qemu-devel] Re: [PATCH 0/4] net-bridge: rootless bridge support for qemu, Dustin Kirkland, 2009/11/04
Re: [Qemu-devel] [PATCH 0/4] net-bridge: rootless bridge support for qemu, Jamie Lokier, 2009/11/04