containerd-shim: Refuse connection from uid/gid different from the shim process

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

cmd/containerd-shim/shim_unix.go

@@ -6,6 +6,8 @@ import (
 	"os"
 	"os/signal"
 
+	"google.golang.org/grpc"
+
 	"github.com/containerd/containerd/reaper"
 	runc "github.com/containerd/go-runc"
 )
@@ -25,3 +27,7 @@ func setupSignals() (chan os.Signal, error) {
 func setupRoot() error {
 	return nil
 }
+
+func newServer() *grpc.Server {
+	return grpc.NewServer()
+}