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authorDavid Howells <dhowells@redhat.com>2008-11-14 10:39:18 +1100
committerJames Morris <jmorris@namei.org>2008-11-14 10:39:18 +1100
commit86a264abe542cfececb4df129bc45a0338d8cdb9 (patch)
tree30152f04ba847f311028d5ca697f864c16c7ebb3 /drivers/net/tun.c
parentf1752eec6145c97163dbce62d17cf5d928e28a27 (diff)
CRED: Wrap current->cred and a few other accessors
Wrap current->cred and a few other accessors to hide their actual implementation. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index b14e2025e22..55dc70c6b4d 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -702,6 +702,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
struct tun_net *tn;
struct tun_struct *tun;
struct net_device *dev;
+ const struct cred *cred = current_cred();
int err;
tn = net_generic(net, tun_net_id);
@@ -712,11 +713,12 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
/* Check permissions */
if (((tun->owner != -1 &&
- current_euid() != tun->owner) ||
+ cred->euid != tun->owner) ||
(tun->group != -1 &&
- current_egid() != tun->group)) &&
- !capable(CAP_NET_ADMIN))
+ cred->egid != tun->group)) &&
+ !capable(CAP_NET_ADMIN)) {
return -EPERM;
+ }
}
else if (__dev_get_by_name(net, ifr->ifr_name))
return -EINVAL;