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Re: [libvirt] [PATCH v2 0/2] qemu: invoke qemu-bridge-helper from libvirtd

On 04/26/2013 03:32 PM, Paolo Bonzini wrote:
> Il 20/04/2013 11:11, Paolo Bonzini ha scritto:
>> The <interface type='bridge'> is working mostly because of a peculiar
>> design decision in Linux.  Ideally, QEMU would run with an empty
>> capability bounding set and would not be able to do any privileged
>> operation (not even by running a helper program).  This is not the case
>> because dropping capabilities from the bounding set requires a capability
>> of its own, CAP_SETPCAP; thus QEMU does *not* run with an empty bounding
>> set if invoked via qemu:///session.  This is apparently for security
>> reasons, to avoid that dropping _some_ caps but not all of them lets
>> you exploit untested error paths in suid binaries.
>> This series lets libvirtd invoke the privileged helper program on its own,
>> which is a cleaner design that would work even if the above Linux quirk
>> was not there.  Also, this adds a <target dev='tap0'/> element to the
>> XML of an active domain using <interface type='bridge'>.
>> Thanks to the patches that have already been committed, the recvfd and
>> virCommand APIs make the task almost trivial.
>> v1->v2: OOM fix in patch 1, change label name in patch 2, rebase

> Please apply. :)


Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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