[Bug 646468] [NEW] Apparmor deny when trying to use hugetlbfs

mik 646468 at bugs.launchpad.net
Fri Sep 24 00:25:10 BST 2010

Public bug reported:

When starting a VM with hugepages support, I get an apparmor deny
message and the VM starts with normal pages.

dmesg shows:
[  449.428584] type=1400 audit(1285282448.505:47): apparmor="DENIED" operation="mknod" parent=1 profile="libvirt-e2420e79-06d6-f8d0-0523-7c52b3650191" name="/dev/hugepages/libvirt/qemu/kvm.2DUKKZ" pid=3325 comm="kvm" requested_mask="c" denied_mask="c" fsuid=103 ouid=103

# lsb_release -rd
Description:	Ubuntu maverick (development branch)
Release:	10.10

To reproduce, I did this:

echo "hugetlbfs /dev/hugepages hugetlbfs defaults 0 0" >> /etc/fstab
echo "vm.nr_hugepages = 1024" >> /etc/sysctl.conf

WARNING: this will use 2G of RAM.  Don't try to apply sysctl settings on
a running system...

Added to my domain xml (somewhere under the domain tag):

Then rebooted and tried to start the domain.

** Affects: libvirt (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: hugepages hugetlbfs

Apparmor deny when trying to use hugetlbfs
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