Re: [libvirt] [PATCH 2/2] LXC: make sure netns been enabled when trying to enable userns

Discussed at: http://www.redhat.com/archives/libvir-list/2015-March/msg01023.html Signed-off-by: Chen Hanxiao <chenhanxiao(a)cn.fujitsu.com&gt; --- src/lxc/lxc_container.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c index e34968a..69a8f2f 100644 --- a/src/lxc/lxc_container.c +++ b/src/lxc/lxc_container.c @@ -941,6 +941,16 @@ static int lxcContainerMountBasicFS(bool userns_enabled, bool bindOverReadonly; virLXCBasicMountInfo const *mnt = &lxcBasicMounts[i]; + /* When enable userns but disable netns, kernel will + * forbid us doing a new fresh mount for sysfs for security reason. + * So we should not allow this. + */ + if (userns_enabled && netns_disabled) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("Userns could not be enabled without netns")); + goto cleanup; + } +