Actually, this is happening because virt-aa-helper is exiting with
error. Unfortunately, libvirt does not deal with this in a way that
makes it easy to debug (ie 'Security labelling error').
Eg:
$ cat /tmp/fiddle2.xml | /usr/lib/libvirt/virt-aa-helper -u
libvirt-fd06659e-3354-cb8e-71d9-cfeeff86e60f -c --dryrun
virt-aa-helper: warning: path does not exist, skipping file type checks
14:07:38.643: warning : virDomainDiskDefForeachPath:7672 : Ignoring open
failure on /media/more/isos/ubuntu-10.10-beta-desktop-i386.iso: No such file or
directory
virt-aa-helper: warning: path does not exist, skipping file type checks
14:07:38.643: warning : virDomainDiskDefForeachPath:7672 : Ignoring open
failure on /dev/main/fiddle2disk: No such file or directory
virt-aa-helper: warning: path does not exist, skipping file type checks
virt-aa-helper: error: /usr/lib/grub-rescue/grub-rescue-floppy.img
virt-aa-helper: error: skipped restricted file
virt-aa-helper: error: invalid VM definition
Copying grub-rescue-floppy.img to /tmp and adjusting the XML works as expected:
$ cat /tmp/foo.xml | /usr/lib/libvirt/virt-aa-helper -u
libvirt-fd06659e-3354-cb8e-71d9-cfeeff86e60f -c --dryrun
virt-aa-helper: warning: path does not exist, skipping file type checks
14:16:18.725: warning : virDomainDiskDefForeachPath:7672 : Ignoring open
failure on /media/more/isos/ubuntu-10.10-beta-desktop-i386.iso: No such file or
directory
virt-aa-helper: warning: path does not exist, skipping file type checks
14:16:18.726: warning : virDomainDiskDefForeachPath:7672 : Ignoring open
failure on /dev/main/fiddle2disk: No such file or directory
virt-aa-helper: warning: path does not exist, skipping file type checks
14:16:18.726: warning : virDomainDiskDefForeachPath:7672 : Ignoring open
failure on /tmp/grub-rescue-floppy.img: No such file or directory
virt-aa-helper:
/etc/apparmor.d/libvirt/libvirt-fd06659e-3354-cb8e-71d9-cfeeff86e60f.files
virt-aa-helper:
"/var/log/libvirt/**/fiddle2.log" w,
"/var/lib/libvirt/**/fiddle2.monitor" rw,
"/var/run/libvirt/**/fiddle2.pid" rwk,
"/media/more/isos/ubuntu-10.10-beta-desktop-i386.iso" r,
# don't audit writes to readonly files
deny "/media/more/isos/ubuntu-10.10-beta-desktop-i386.iso" w,
"/dev/main/fiddle2disk" rw,
"/tmp/grub-rescue-floppy.img" r,
# don't audit writes to readonly files
deny "/tmp/grub-rescue-floppy.img" w,
virt-aa-helper:
/etc/apparmor.d/libvirt/libvirt-fd06659e-3354-cb8e-71d9-cfeeff86e60f
virt-aa-helper:
libvirt-fd06659e-3354-cb8e-71d9-cfeeff86e60f
virt-aa-helper:
#include <libvirt/libvirt-fd06659e-3354-cb8e-71d9-cfeeff86e60f.files>
** Changed in: libvirt (Ubuntu)
Status: Incomplete => Triaged
--
Unhelpful Security labelling error with read-only floppy image
https://bugs.launchpad.net/bugs/647664
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