1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index ef3b65514976..60d0a4e60ec5 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -3102,6 +3102,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
 
         tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd);
 
+        net = dev_net(tun->dev);
         ret = 0;
         switch (cmd) {
         case TUNGETIFF:
@@ -3327,6 +3328,13 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
                 ret = tun_net_change_carrier(tun->dev, (bool)carrier);
                 break;
 
+        case TUNGETDEVNETNS:
+                ret = -EPERM;
+                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+                        goto unlock;
+                ret = open_related_ns(&net->ns, get_net_ns);
+                break;
+
         default:
                 ret = -EINVAL;
                 break;