This is a note to let you know that I've just added the patch titled
macvtap: signal truncated packets
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
macvtap-signal-truncated-packets.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From foo@baz Mon Jan 13 09:44:41 PST 2014
From: Jason Wang <[email protected]>
Date: Wed, 11 Dec 2013 13:08:34 +0800
Subject: macvtap: signal truncated packets
From: Jason Wang <[email protected]>
[ Upstream commit ce232ce01d61b184202bb185103d119820e1260c ]
macvtap_put_user() never return a value grater than iov length, this in fact
bypasses the truncated checking in macvtap_recvmsg(). Fix this by always
returning the size of packet plus the possible vlan header to let the trunca
checking work.
Cc: Vlad Yasevich <[email protected]>
Cc: Zhi Yong Wu <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
Acked-by: Vlad Yasevich <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/macvtap.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -770,7 +770,7 @@ static ssize_t macvtap_put_user(struct m
int ret;
int vnet_hdr_len = 0;
int vlan_offset = 0;
- int copied;
+ int copied, total;
if (q->flags & IFF_VNET_HDR) {
struct virtio_net_hdr vnet_hdr;
@@ -785,7 +785,8 @@ static ssize_t macvtap_put_user(struct m
if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0,
sizeof(vnet_hdr)))
return -EFAULT;
}
- copied = vnet_hdr_len;
+ total = copied = vnet_hdr_len;
+ total += skb->len;
if (!vlan_tx_tag_present(skb))
len = min_t(int, skb->len, len);
@@ -800,6 +801,7 @@ static ssize_t macvtap_put_user(struct m
vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto);
len = min_t(int, skb->len + VLAN_HLEN, len);
+ total += VLAN_HLEN;
copy = min_t(int, vlan_offset, len);
ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy);
@@ -817,10 +819,9 @@ static ssize_t macvtap_put_user(struct m
}
ret = skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len);
- copied += len;
done:
- return ret ? ret : copied;
+ return ret ? ret : total;
}
static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb,
@@ -875,7 +876,7 @@ static ssize_t macvtap_aio_read(struct k
}
ret = macvtap_do_read(q, iocb, iv, len, file->f_flags & O_NONBLOCK);
- ret = min_t(ssize_t, ret, len); /* XXX copied from tun.c. Why? */
+ ret = min_t(ssize_t, ret, len);
if (ret > 0)
iocb->ki_pos = ret;
out:
Patches currently in stable-queue which might be from [email protected] are
queue-3.12/macvtap-signal-truncated-packets.patch
queue-3.12/tun-unbreak-truncated-packet-signalling.patch
queue-3.12/macvtap-do-not-double-count-received-packets.patch
queue-3.12/virtio-delete-napi-structures-from-netdev-before-releasing-memory.patch
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