[3.11.y.z extended stable] Patch "macvtap: limit head length of skb allocated" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    macvtap: limit head length of skb allocated

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From ec35b0601ce41a5e83a7a383e8e07065107c5c96 Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang at redhat.com>
Date: Wed, 13 Nov 2013 14:00:40 +0800
Subject: macvtap: limit head length of skb allocated

commit 16a3fa28630331e28208872fa5341ce210b901c7 upstream.

We currently use hdr_len as a hint of head length which is advertised by
guest. But when guest advertise a very big value, it can lead to an 64K+
allocating of kmalloc() which has a very high possibility of failure when host
memory is fragmented or under heavy stress. The huge hdr_len also reduce the
effect of zerocopy or even disable if a gso skb is linearized in guest.

To solves those issues, this patch introduces an upper limit (PAGE_SIZE) of the
head, which guarantees an order 0 allocation each time.

Cc: Stefan Hajnoczi <stefanha at redhat.com>
Cc: Michael S. Tsirkin <mst at redhat.com>
Signed-off-by: Jason Wang <jasowang at redhat.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/macvtap.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index ea53abb..3c87e53 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -731,6 +731,7 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
 				const struct iovec *iv, unsigned long total_len,
 				size_t count, int noblock)
 {
+	int good_linear = SKB_MAX_HEAD(NET_IP_ALIGN);
 	struct sk_buff *skb;
 	struct macvlan_dev *vlan;
 	unsigned long len = total_len;
@@ -773,6 +774,8 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,

 	if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) {
 		copylen = vnet_hdr.hdr_len ? vnet_hdr.hdr_len : GOODCOPY_LEN;
+		if (copylen > good_linear)
+			copylen = good_linear;
 		linear = copylen;
 		if (iov_pages(iv, vnet_hdr_len + copylen, count)
 		    <= MAX_SKB_FRAGS)
@@ -781,7 +784,10 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,

 	if (!zerocopy) {
 		copylen = len;
-		linear = vnet_hdr.hdr_len;
+		if (vnet_hdr.hdr_len > good_linear)
+			linear = good_linear;
+		else
+			linear = vnet_hdr.hdr_len;
 	}

 	skb = macvtap_alloc_skb(&q->sk, NET_IP_ALIGN, copylen,
--
1.8.3.2