1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index a2c6caaaae93..62b2b3005019 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -432,6 +432,7 @@ static void tun_setup(struct net_device *dev)
         init_waitqueue_head(&tun->read_wait);
 
         tun->owner = -1;
+        tun->group = -1;
 
         SET_MODULE_OWNER(dev);
         dev->open = tun_net_open;
@@ -467,8 +468,11 @@ static int tun_set_iff(struct file *file, struct ifreq *ifr)
                         return -EBUSY;
 
                 /* Check permissions */
-                if (tun->owner != -1 &&
-                    current->euid != tun->owner && !capable(CAP_NET_ADMIN))
+                if (((tun->owner != -1 &&
+                      current->euid != tun->owner) ||
+                     (tun->group != -1 &&
+                      current->egid != tun->group)) &&
+                     !capable(CAP_NET_ADMIN))
                         return -EPERM;
         }
         else if (__dev_get_by_name(ifr->ifr_name))
@@ -610,6 +614,13 @@ static int tun_chr_ioctl(struct inode *inode, struct file *file,
                 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
                 break;
 
+        case TUNSETGROUP:
+                /* Set group of the device */
+                tun->group= (gid_t) arg;
+
+                DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
+                break;
+
         case TUNSETLINK:
                 /* Only allow setting the type when the interface is down */
                 if (tun->dev->flags & IFF_UP) {