Need to setup labeling of kernel keyrings.

Work is ongoing in the kernel to support different kernel
keyrings per user namespace.  We want to allow SELinux to manage
kernel keyrings inside of the container.

Currently when runc creates the kernel keyring it gets the label which runc is
running with ususally `container_runtime_t`, with this change the kernel keyring
will be labeled with the container process label container_t:s0:C1,c2.

Container running as container_t:s0:c1,c2 can manage keyrings with the same label.

This change required a revendoring or the SELinux go bindings.

github.com/opencontainers/selinux.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

libcontainer/setns_init_linux.go

@@ -34,6 +34,10 @@ func (l *linuxSetnsInit) Init() error {
 	defer runtime.UnlockOSThread()
 
 	if !l.config.Config.NoNewKeyring {
+		if err := label.SetKeyLabel(l.config.ProcessLabel); err != nil {
+			return err
+		}
+		defer label.SetKeyLabel("")
 		// Do not inherit the parent's session keyring.
 		if _, err := keys.JoinSessionKeyring(l.getSessionRingName()); err != nil {
 			// Same justification as in standart_init_linux.go as to why we

libcontainer/standard_init_linux.go

@@ -48,6 +48,10 @@ func (l *linuxStandardInit) Init() error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 	if !l.config.Config.NoNewKeyring {
+		if err := label.SetKeyLabel(l.config.ProcessLabel); err != nil {
+			return err
+		}
+		defer label.SetKeyLabel("")
 		ringname, keepperms, newperms := l.getSessionRingParams()
 
 		// Do not inherit the parent's session keyring.

vendor.conf

@@ -5,7 +5,7 @@ github.com/opencontainers/runtime-spec 29686dbc5559d93fb1ef402eeda3e35c38d75af4
 # Core libcontainer functionality.
 github.com/checkpoint-restore/go-criu v3.11
 github.com/mrunalp/fileutils ed869b029674c0e9ce4c0dfa781405c2d9946d08
-github.com/opencontainers/selinux v1.0.0-rc1
+github.com/opencontainers/selinux v1.2
 github.com/seccomp/libseccomp-golang 84e90a91acea0f4e51e62bc1a75de18b1fc0790f
 github.com/sirupsen/logrus a3f95b5c423586578a4e099b11a46c2479628cac
 github.com/syndtr/gocapability db04d3cc01c8b54962a58ec7e491717d06cfcc16