[PATCH] Ensure securityfs is mounted readonly in container

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

From: Dan Walsh <dwalsh@xxxxxxxxxx>

If securityfs is available on the host, we should ensure to
mount it read-only in the container. This will avoid systemd
trying to mount it during startup causing SELinux AVCs.

Signed-off-by: Daniel P. Berrange <berrange@xxxxxxxxxx>
---
 src/lxc/lxc_container.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index b910b10..a943b22 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -770,6 +770,8 @@ static int lxcContainerMountBasicFS(void)
         { "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY },
         { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV },
         { "sysfs", "/sys", "sysfs", NULL, MS_BIND|MS_REMOUNT|MS_RDONLY },
+        { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV },
+        { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_BIND|MS_REMOUNT|MS_RDONLY },
 #if WITH_SELINUX
         { SELINUX_MOUNT, SELINUX_MOUNT, "selinuxfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV },
         { SELINUX_MOUNT, SELINUX_MOUNT, NULL, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY },
-- 
1.8.3.1

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