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From: Avi Kivity <avi@redhat.com>
To: dlaor@redhat.com, qemu-devel@nongnu.org
Cc: Mark McLoughlin <markmc@redhat.com>, kvm <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] Re: [PATCH 1/5] virtio-net: Allow setting the MAC address via set_config
Date: Sun, 18 Jan 2009 11:42:24 +0200	[thread overview]
Message-ID: <4972F980.7080806@redhat.com> (raw)
In-Reply-To: <4972F850.50408@redhat.com>

Dor Laor wrote:
> Jamie Lokier wrote:
>> Dor Laor wrote:
>>  
>>> What I meant is that if we allow the guest to change his mac 
>>> address, it can deliberately
>>> change it to other hosts/guests mac and thus create networking 
>>> problems.
>>> Although guest can always mangle packets, maybe it worth enforcing 
>>> these macs for the guest.
>>>     
>>
>> Although it can create network problems, sometimes it is also wanted.
>>
>> I think if you want to restrict the guests's ability to break the
>> network by changing its MAC, it would be appropriate to have an option
>> to completely lock down the MAC so the guest can't change its MAC at 
>> all.
>>
>>   
> That's what I was shooting to.
> One example this can be helpful is when kvm is used to run virtual 
> servers in a computing
> farm like Amazon. You wouldn't like a VM owner to mess your network.

Restricting the MAC address won't help.  The guest can still forge the 
link layer address and/or the IP layer addresses.

This needs to be addressed by netfilter.

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


  reply	other threads:[~2009-01-18  9:42 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-01-13 21:23 [PATCH 1/5] virtio-net: Allow setting the MAC address via set_config Alex Williamson
2009-01-14 10:05 ` Dor Laor
2009-01-14 15:34   ` Alex Williamson
2009-01-14 16:41     ` [Qemu-devel] " Jamie Lokier
2009-01-14 22:06       ` Dor Laor
2009-01-14 22:14         ` Paul Brook
2009-01-15 13:11           ` Jamie Lokier
2009-01-15 13:12         ` Jamie Lokier
2009-01-15 13:41           ` Avi Kivity
2009-01-18  9:37           ` Dor Laor
2009-01-18  9:42             ` Avi Kivity [this message]
2009-01-14 22:08       ` Dor Laor

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