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[Launchpad Bug Tracker <1686324@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package libvirt - 3.6.0-1ubuntu6

---------------
libvirt (3.6.0-1ubuntu6) artful; urgency=medium

  * d/p/ubuntu-aa/0037-virt-aa-helper...: grant locking permission on append
    files (LP: #1726804)
  * d/p/ubuntu-aa/0038-virt-aa-helper-fix-paths-for-usb-hostdevs.patch:
    fix path generation for USB host devices (LP: #1552241)
  * d/p/ubuntu-aa/0039-virt-aa-helper-fix-libusb-access-to-udev-usb-data.patch:
    generate valid rules on usb passthrough (LP: #1686324)

 -- Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx>  Tue, 24 Oct
2017 14:30:34 +0200

** Changed in: libvirt (Ubuntu Artful)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1686324

Title:
  usb hostdev passthrough generates the wrong apparmor rules

Status in libvirt package in Ubuntu:
  Fix Committed
Status in libvirt source package in Xenial:
  New
Status in libvirt source package in Zesty:
  New
Status in libvirt source package in Artful:
  Fix Released

Bug description:
  [Impact]

   * USB Host devices fail to add statically

   * The reason is that libvirt has not yet initialized usb devices

   * Fix by back-porting small upstream change

  [Test Case]

   * Create a VM Guest (e.g. via uvtool)
   * Shut down the guest
   * virsh edit <guestname>
   * Add a usb hostdev from your System (check lsusb for IDs)
   * See the original description below for XML examples
   * Starting the guest will create a wrong rule
       "/dev/bus/usb/000/000" rw,
     And due to that fails to start.

  [Regression Potential]

   * The change is small and only makes certain values available to
  libvirt

   * The only thing I could think of regressing is if that 
     virHostdevFindUSBDevice would crash on some systems, but then it would 
     fail later on in the lifecycle even without the patch - so we should be 
     safe IMHO.

  [Other Info]
   
   * I waited to be accepted upstream to be more confident which is 
     partially why this took so long but provides some extra confidence.

  
  ---

  
  Libvirt-aa-helper seems to have a bug when adding usb passthrough devices statically.

  On hotplug with:
  $ cat sandisk-usb.xml
  <hostdev mode='subsystem' type='usb' managed='yes'>
      <source>
          <!--
            idVendor           0x0781 SanDisk Corp.
            idProduct          0x5580 SDCZ80 Flash Drive
          -->
          <vendor id='0x0781'/>
          <product id='0x5580'/>
      </source>
  </hostdev>

  $ virsh attach-device z-test1 sandisk-usb.xml

  It generates correctly:
  "/dev/bus/usb/003/003" rw,

  But if adding the same XML part to the guest xml itself it generates:
  "/dev/bus/usb/000/000" rw,

  And as a follow on issue the guest start fails with:
  libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/003/003: Permission denied
  Due to:
  apparmor="DENIED" operation="open" profile="libvirt-adc578cb-905f-41fc-9be2-9fb81f6a6073" name="/dev/bus/usb/003/003" pid=22879 comm="qemu-system-x86" requested_mask="wr" denied_mask="wr" fsuid=123 ouid=123

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