Description of problem:

With SELinux in Enforcing mode


Version-Release number of selected component (if applicable):

libvirt-1.3.3.2-1.fc24.x86_64
kernel-4.7.9-200.fc24.x86_64
selinux-policy-targeted-3.13.1-191.19.fc24.noarch


How reproducible:
100%


Steps to Reproduce:
1. Create a .qcow2 image with a backing file
2. Set SELinux to Enforcing mode
3. Start the VM: "virsh start mymachine"

Actual results:

Access denied while accessing the template file.


Expected results:

VM to start


Additional info:

When libvirt attempts to start the VM, it sets a label with a ":s0:cXXX.cYYY" to the machine image. Although the template is "r--r--r--" and it is ":s0", and qemu user can access the machine it gets access denied.

type=AVC msg=audit(1477934362.744:2180): avc:  denied  { read } for  pid=19743 comm="qemu-system-x86" name="vm" dev="dm-2" ino=499679 scontext=system_u:system_r:svirt_t:s0:c284,c779 tcontext=system_u:object_r:default_t:s0 tclass=lnk_file permissive=0

By creating an image without the backing file (and no other changes) the VM starts successfully.