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>

vendor/github.com/opencontainers/selinux/go-selinux/label/label.go

@@ -9,7 +9,7 @@ func InitLabels(options []string) (string, string, error) {
 	return "", "", nil
 }
 
-func GetROMountLabel() string {
+func ROMountLabel() string {
 	return ""
 }
 
@@ -25,7 +25,27 @@ func SetProcessLabel(processLabel string) error {
 	return nil
 }
 
-func GetFileLabel(path string) (string, error) {
+func ProcessLabel() (string, error) {
+	return "", nil
+}
+
+func SetSocketLabel(processLabel string) error {
+	return nil
+}
+
+func SocketLabel() (string, error) {
+	return "", nil
+}
+
+func SetKeyLabel(processLabel string) error {
+	return nil
+}
+
+func KeyLabel() (string, error) {
+	return "", nil
+}
+
+func FileLabel(path string) (string, error) {
 	return "", nil
 }
 
@@ -41,13 +61,18 @@ func Relabel(path string, fileLabel string, shared bool) error {
 	return nil
 }
 
-func GetPidLabel(pid int) (string, error) {
+func PidLabel(pid int) (string, error) {
 	return "", nil
 }
 
 func Init() {
 }
 
+// ClearLabels clears all reserved labels
+func ClearLabels() {
+	return
+}
+
 func ReserveLabel(label string) error {
 	return nil
 }
@@ -58,8 +83,8 @@ func ReleaseLabel(label string) error {
 
 // DupSecOpt takes a process label and returns security options that
 // can be used to set duplicate labels on future container processes
-func DupSecOpt(src string) []string {
-	return nil
+func DupSecOpt(src string) ([]string, error) {
+	return nil, nil
 }
 
 // DisableSecOpt returns a security opt that can disable labeling