1 files changed, 8 insertions, 1 deletions
diff --git a/pkg/rootless/rootless_linux.c b/pkg/rootless/rootless_linux.c
index 9eb16c1a5..1d28ff68d 100644
--- a/pkg/rootless/rootless_linux.c
+++ b/pkg/rootless/rootless_linux.c
@@ -99,7 +99,7 @@ get_cmd_line_args (pid_t pid)
 }
 
 int
-reexec_userns_join (int userns)
+reexec_userns_join (int userns, int mountns)
 {
   pid_t ppid = getpid ();
   char uid[16];
@@ -131,6 +131,13 @@ reexec_userns_join (int userns)
     }
   close (userns);
 
+  if (mountns >= 0 && setns (mountns, 0) < 0)
+    {
+      fprintf (stderr, "cannot setns: %s\n", strerror (errno));
+      _exit (EXIT_FAILURE);
+    }
+  close (userns);
+
   if (syscall_setresgid (0, 0, 0) < 0)
     {
       fprintf (stderr, "cannot setresgid: %s\n", strerror (errno));