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.ehrha...@canonical.com> 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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