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Description of problem:
Owner and SElinux context cannot be restore after hot-unplug USB Host device.
Version-Release number of selected component (if applicable):
libvirt-1.3.4-1.el7.x86_64
qemu-kvm-rhev-2.6.0-4.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1.Prepared an USB device
# lsusb
......
Bus 002 Device 006: ID 0951:1656 Kingston Technology DataTraveler Ultimate G2
# ls -alZ /dev/bus/usb/002/006 -alZ
crw-rw-r--. root root system_u:object_r:usb_device_t:s0 /dev/bus/usb/002/006
2. attach this USB device to a running guest.
# cat hostdev-usb3.xml
<hostdev mode='subsystem' type='usb' managed='yes'>
<source startupPolicy='optional'>
<vendor id='0x0951'/>
<product id='0x1656'/>
</source>
</hostdev>
# virsh attach-device r72 hostdev-usb3.xml
Device attached successfully
check Owner and SElinux label
# ls -alZ /dev/bus/usb/002/006 -alZ
crw-rw-r--. qemu qemu system_u:object_r:svirt_image_t:s0:c270,c634 /dev/bus/usb/002/006
3. detach device
# virsh detach-device r72 hostdev-usb3.xml
Device detached successfully
check owner and SElinxu label again.
# ls -alZ /dev/bus/usb/002/006
crw-rw-r--. qemu qemu system_u:object_r:svirt_image_t:s0:c270,c634 /dev/bus/usb/002/006
# virsh destroy r72
Domain r72 destroyed
# ls -alZ /dev/bus/usb/002/006
crw-rw-r--. qemu qemu system_u:object_r:svirt_image_t:s0:c270,c634 /dev/bus/usb/002/006
Actual results:
As step 3, usb device keep the owner and SElinux context as set to virtual machine.
Expected results:
Libvirt should clean what it modified before. After detach device, usb device should be changed back to original permission and SELinux context.
Additional info:
It cannot be reproduced on RHEL7.2.
Pushed as:
commit 22d262c9b019ab43bc9ff7188fc31794902d5287
Author: Ján Tomko <jtomko>
CommitDate: 2016-06-17 19:43:22 +0200
qemu: restore non-pci hostdev labels after detach
Commit 409de00 changed the logic to only match PCI devices
while moving this before Remove*HostDevice calls.
https://bugzilla.redhat.com/show_bug.cgi?id=1342874
git describe: v1.3.5-316-g22d262c
verify the bug
version:
libvirt-2.0.0-6.el7.x86_64
qemu-kvm-rhev-2.6.0-22.el7.x86_64
steps:
1.Prepared an USB device
[root@localhost ~]# lsusb
Bus 002 Device 002: ID 0951:1642 Kingston Technology DT101 G2
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
[root@localhost ~]# ls -alZ /dev/bus/usb/002/002
crw-rw-r--. root root system_u:object_r:usb_device_t:s0 /dev/bus/usb/002/002
2. attach this USB device to a running guest
[root@localhost ~]# cat usb.xml
<hostdev mode='subsystem' type='usb' managed='yes'>
<source startupPolicy='optional'>
<vendor id='0x0951'/>
<product id='0x1642'/>
</source>
</hostdev>
[root@localhost ~]# virsh attach-device bios usb.xml
Device attached successfully
[root@localhost ~]# ls -alZ /dev/bus/usb/002/002
crw-rw-r--. qemu qemu system_u:object_r:svirt_image_t:s0:c152,c690 /dev/bus/usb/002/002
3. detach device
[root@localhost ~]# virsh detach-device bios usb.xml
Device detached successfully
[root@localhost ~]#
[root@localhost ~]# ls -alZ /dev/bus/usb/002/002
crw-rw-r--. root root system_u:object_r:usb_device_t:s0 /dev/bus/usb/002/002
usb device is changed back to original permission and SELinux context.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHSA-2016-2577.html