From patchwork Thu Aug 10 16:41:58 2017
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: [net] packet: fix tp_reserve race in packet_set_ring
From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
X-Patchwork-Id: 800274
X-Patchwork-Delegate: davem@davemloft.net
Message-Id: <20170810164158.52213-1-willemdebruijn.kernel@gmail.com>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, andreyknvl@gmail.com,
 Willem de Bruijn <willemb@google.com>
Date: Thu, 10 Aug 2017 12:41:58 -0400

From: Willem de Bruijn <willemb@google.com>

Updates to tp_reserve can race with reads of the field in
packet_set_ring. Avoid this by holding the socket lock during
updates in setsockopt PACKET_RESERVE.

This bug was discovered by syzkaller.

Fixes: 8913336a7e8d ("packet: add PACKET_RESERVE sockopt")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
---
 net/packet/af_packet.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 0615c2a950fa..008a45ca3112 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3700,14 +3700,19 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 
 		if (optlen != sizeof(val))
 			return -EINVAL;
-		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
-			return -EBUSY;
 		if (copy_from_user(&val, optval, sizeof(val)))
 			return -EFAULT;
 		if (val > INT_MAX)
 			return -EINVAL;
-		po->tp_reserve = val;
-		return 0;
+		lock_sock(sk);
+		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
+			ret = -EBUSY;
+		} else {
+			po->tp_reserve = val;
+			ret = 0;
+		}
+		release_sock(sk);
+		return ret;
 	}
 	case PACKET_LOSS:
 	{