netdev - [net-next PATCH] veth: don't assign a qdisc to veth

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 03 Oct 2014 12:48:58 +0200
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Cc:	Jiri Pirko <jpirko@...hat.com>, mpatel@...hat.com
Subject: [net-next PATCH] veth: don't assign a qdisc to veth

The veth driver is a virtual device, and should not have assigned
the default qdisc.  Verified (ndo_start_xmit) veth_xmit can only
return NETDEV_TX_OK, thus this should be safe to bypass qdisc.

Not assigning a qdisc is subtly done by setting tx_queue_len to zero.

Reported-by: Mrunal Patel <mpatel@...hat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
---

 drivers/net/veth.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 8ad5965..3c32fcf 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -287,6 +287,7 @@ static const struct net_device_ops veth_netdev_ops = {
 static void veth_setup(struct net_device *dev)
 {
 	ether_setup(dev);
+	dev->tx_queue_len = 0;
 
 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html