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Re: [libvirt] /var/lib/libvirt/qemu permissions are wrong



On Thu, Jan 09, 2014 at 02:12:20PM -0200, Marcelo Cerri wrote:
> Hi,
> 
> Any directions regarding which is the best approach to correct the bug
> reported in https://bugzilla.redhat.com/show_bug.cgi?id=1045040 ?

[This is a copy of the comment I added to that bug]

libvirt currently creates the monitor sockets directly in
/var/lib/libvirt/qemu/ eg:

$ sudo ls -l /var/lib/libvirt/qemu/
total 16
srwxr-xr-x. 1 qemu qemu    0 Jan  6 16:00 builder-rhel6.monitor
srwxr-xr-x. 1 qemu qemu    0 Dec 20 22:04 builder-rhel7.monitor
[etc]

The problem is this doesn't work if we told libvirt to run qemu as
another UID, which is possible (albeit undocumented):

  <seclabel model='dac' type='static'> <label>user:group</label> </seclabel>

If you do that you'll find that qemu won't be able to access the
monitor socket in some situations.

To fix this, libvirt should create a subdirectory per guest.  The
permissions on /var/lib/libvirt/qemu/ should be relaxed, and the owner
or SELinux label of /var/lib/libvirt/qemu/<guestname> should be set so
qemu can access it.

(I suspect the monitor sockets should really go in /run, but the
same arguments apply)

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v


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