CRED: Wrap task credential accesses in the network device drivers

Wrap access to task credentials so that they can be separated more easily from
the task_struct during the introduction of COW creds.

Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().

Change some task->e?[ug]id to task_e?[ug]id().  In some places it makes more
sense to use RCU directly rather than a convenient wrapper; these will be
addressed by later patches.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: netdev@vger.kernel.org
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 33b6d1b122fb..b14e2025e221 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -712,9 +712,9 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
 
                 /* Check permissions */
                 if (((tun->owner != -1 &&
-                      current->euid != tun->owner) ||
+                      current_euid() != tun->owner) ||
                      (tun->group != -1 &&
-                      current->egid != tun->group)) &&
+                      current_egid() != tun->group)) &&
                      !capable(CAP_NET_ADMIN))
                         return -EPERM;
         }