diff options
| author | Mahesh Bandewar <maheshb@google.com> | 2020-03-09 15:57:07 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-03-09 18:02:19 -0700 |
| commit | ce9a4186f9ac475c415ffd20348176a4ea366670 (patch) | |
| tree | 13364a4cbe4e9b7ebd3dfeaf13e987798933abc7 /drivers | |
| parent | e18b353f102e371580f3f01dd47567a25acc3c1d (diff) | |
macvlan: add cond_resched() during multicast processing
The Rx bound multicast packets are deferred to a workqueue and
macvlan can also suffer from the same attack that was discovered
by Syzbot for IPvlan. This solution is not as effective as in
IPvlan. IPvlan defers all (Tx and Rx) multicast packet processing
to a workqueue while macvlan does this way only for the Rx. This
fix should address the Rx codition to certain extent.
Tx is still suseptible. Tx multicast processing happens when
.ndo_start_xmit is called, hence we cannot add cond_resched().
However, it's not that severe since the user which is generating
/ flooding will be affected the most.
Fixes: 412ca1550cbe ("macvlan: Move broadcasts into a work queue")
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/macvlan.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index 81aa7adf4801..e7289d67268f 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -334,6 +334,8 @@ static void macvlan_process_broadcast(struct work_struct *w) if (src) dev_put(src->dev); consume_skb(skb); + + cond_resched(); } } |