@@ -9,5 +9,6 @@ import (

 func execSetPlatformOpt(c *container.Container, ec *exec.Config, p *libcontainerd.Process) error {

 	// Process arguments need to be escaped before sending to OCI.

 	p.Args = escapeArgs(p.Args)

+	p.User.Username = ec.User

 	return nil

 }

@@ -301,6 +301,7 @@ func (clnt *client) AddProcess(ctx context.Context, containerID, processFriendly

 	// Configure the environment for the process

 	createProcessParms.Environment = setupEnvironmentVariables(procToAdd.Env)

 	createProcessParms.CommandLine = strings.Join(procToAdd.Args, " ")

+	createProcessParms.User = procToAdd.User.Username

 	logrus.Debugf("libcontainerd: commandLine: %s", createProcessParms.CommandLine)

@@ -81,6 +81,7 @@ func (ctr *container) start(attachStdio StdioCallback) error {

 	// Configure the environment for the process

 	createProcessParms.Environment = setupEnvironmentVariables(ctr.ociSpec.Process.Env)

 	createProcessParms.CommandLine = strings.Join(ctr.ociSpec.Process.Args, " ")

+	createProcessParms.User = ctr.ociSpec.Process.User.Username

 	// Start the command running in the container.

 	newProcess, err := ctr.hcsContainer.CreateProcess(createProcessParms)