Set Socket label for contianer

This will allow container processes to write to the CRIU socket that gets injected
into the container.

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

libpod/oci.go

@@ -861,6 +861,7 @@ func (r *OCIRuntime) execStopContainer(ctr *Container, timeout uint) error {
 
 // checkpointContainer checkpoints the given container
 func (r *OCIRuntime) checkpointContainer(ctr *Container, options ContainerCheckpointOptions) error {
+	label.SetSocketLabel(ctr.ProcessLabel())
 	// imagePath is used by CRIU to store the actual checkpoint files
 	imagePath := ctr.CheckpointPath()
 	// workPath will be used to store dump.log and stats-dump

vendor.conf

@@ -51,7 +51,7 @@ github.com/opencontainers/image-spec v1.0.0
 github.com/opencontainers/runc b4e2ecb452d9ee4381137cc0a7e6715b96bed6de
 github.com/opencontainers/runtime-spec d810dbc60d8c5aeeb3d054bd1132fab2121968ce
 github.com/opencontainers/runtime-tools master
-github.com/opencontainers/selinux 6ba084dd09db3dfe49a839bab0bbe97fd9274d80
+github.com/opencontainers/selinux 51c6c0a5dbc675792e953298cb9871819d6f9bb8
 github.com/ostreedev/ostree-go master
 github.com/pkg/errors v0.8.0
 github.com/pmezard/go-difflib 792786c7400a136282c1664665ae0a8db921c6c2

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 +25,19 @@ 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 FileLabel(path string) (string, error) {
 	return "", nil
 }
 
@@ -41,7 +53,7 @@ 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
 }
 

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

@@ -95,6 +95,17 @@ func SetProcessLabel(processLabel string) error {
 	return selinux.SetExecLabel(processLabel)
 }
 
+// SetSocketLabel takes a process label and tells the kernel to assign the
+// label to the next socket that gets created
+func SetSocketLabel(processLabel string) error {
+	return selinux.SetSocketLabel(processLabel)
+}
+
+// SocketLabel retrieves the current default socket label setting
+func SocketLabel() (string, error) {
+	return selinux.SocketLabel()
+}
+
 // ProcessLabel returns the process label that the kernel will assign
 // to the next program executed by the current process.  If "" is returned
 // this indicates that the default labeling will happen for the process.
@@ -102,7 +113,7 @@ func ProcessLabel() (string, error) {
 	return selinux.ExecLabel()
 }
 
-// GetFileLabel returns the label for specified path
+// FileLabel returns the label for specified path
 func FileLabel(path string) (string, error) {
 	return selinux.FileLabel(path)
 }

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

@@ -385,6 +385,17 @@ func SetExecLabel(label string) error {
 	return writeCon(fmt.Sprintf("/proc/self/task/%d/attr/exec", syscall.Gettid()), label)
 }
 
+// SetSocketLabel takes a process label and tells the kernel to assign the
+// label to the next socket that gets created
+func SetSocketLabel(label string) error {
+	return writeCon(fmt.Sprintf("/proc/self/task/%d/attr/sockcreate", syscall.Gettid()), label)
+}
+
+// SocketLabel retrieves the current socket label setting
+func SocketLabel() (string, error) {
+	return readCon(fmt.Sprintf("/proc/self/task/%d/attr/sockcreate", syscall.Gettid()))
+}
+
 // Get returns the Context as a string
 func (c Context) Get() string {
 	if c["level"] != "" {

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

@@ -96,6 +96,19 @@ func SetExecLabel(label string) error {
 	return nil
 }
 
+/*
+SetSocketLabel sets the SELinux label that the kernel will use for any programs
+that are executed by the current process thread, or an error.
+*/
+func SetSocketLabel(label string) error {
+	return nil
+}
+
+// SocketLabel retrieves the current socket label setting
+func SocketLabel() (string, error) {
+	return "", nil
+}
+
 // Get returns the Context as a string
 func (c Context) Get() string {
 	return ""