netdev - [PATCH net] tun: forbid iface creation with rtnl ops

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Message-Id: <20181129134539.24483-1-nicolas.dichtel@6wind.com>
Date:   Thu, 29 Nov 2018 14:45:39 +0100
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>
Subject: [PATCH net] tun: forbid iface creation with rtnl ops

It's not supported right now (the goal of the initial patch was to support
'ip link del' only).

Before the patch:
$ ip link add foo type tun
[  239.632660] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[snip]
[  239.636410] RIP: 0010:register_netdevice+0x8e/0x3a0

This panic occurs because dev->netdev_ops is not set by tun_setup(). But to
have something usable, it will require more than just setting
netdev_ops.

Fixes: f019a7a594d9 ("tun: Implement ip link del tunXXX")
CC: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
 drivers/net/tun.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index e244f5d7512a..cf349e65a66b 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2293,9 +2293,9 @@ static void tun_setup(struct net_device *dev)
 static int tun_validate(struct nlattr *tb[], struct nlattr *data[],
 			struct netlink_ext_ack *extack)
 {
-	if (!data)
-		return 0;
-	return -EINVAL;
+	NL_SET_ERR_MSG(extack,
+		       "tun/tap creation via rtnetlink is not supported.");
+	return -EOPNOTSUPP;
 }
 
 static size_t tun_get_size(const struct net_device *dev)
-- 
2.18.0