Re: [libvirt] [PATCH 6/6] Skip any files which are not mounted on the host

From: "Daniel P. Berrange" <berrange(a)redhat.com&gt; Currently the LXC container tries to skip selinux/securityfs mounts if the directory does not exist in the filesystem, or if SELinux is disabled. The former check is flawed because the /sys/fs/selinux or /sys/kernel/securityfs directories may exist in sysfs even if the mount type is disabled. Instead of just doing an access() check, use an virFileIsMounted() to see if the FS is actually present in the host OS. This also avoids the need to check is_selinux_enabled(). Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com&gt; --- src/lxc/lxc_container.c | 37 +++++++++++++++++++++++-------------- 1 file changed, 23 insertions(+), 14 deletions(-) static const virLXCBasicMountInfo lxcBasicMounts[] = { - { "proc", "/proc", "proc", MS_NOSUID|MS_NOEXEC|MS_NODEV, false }, - { "/proc/sys", "/proc/sys", NULL, MS_BIND|MS_RDONLY, false }, - { "sysfs", "/sys", "sysfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, false }, - { "securityfs", "/sys/kernel/security", "securityfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, true }, + { "proc", "/proc", "proc", MS_NOSUID|MS_NOEXEC|MS_NODEV, false, false }, + { "/proc/sys", "/proc/sys", NULL, MS_BIND|MS_RDONLY, false, false }, + { "sysfs", "/sys", "sysfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, false, false }, + { "securityfs", "/sys/kernel/security", "securityfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, true, true }, #if WITH_SELINUX - { SELINUX_MOUNT, SELINUX_MOUNT, "selinuxfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, true }, + { SELINUX_MOUNT, SELINUX_MOUNT, "selinuxfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, true, true },