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Subject[PATCH 20/30] netvm: filter emergency skbs.
Toss all emergency packets not for a SOCK_MEMALLOC socket. This ensures our
precious memory reserve doesn't get stuck waiting for user-space.

The correctness of this approach relies on the fact that networks must be
assumed lossy.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
net/core/filter.c | 3 +++
1 file changed, 3 insertions(+)

Index: linux-2.6/net/core/filter.c
===================================================================
--- linux-2.6.orig/net/core/filter.c
+++ linux-2.6/net/core/filter.c
@@ -81,6 +81,9 @@ int sk_filter(struct sock *sk, struct sk
int err;
struct sk_filter *filter;

+ if (skb_emergency(skb) && !sk_has_memalloc(sk))
+ return -ENOMEM;
+
err = security_sock_rcv_skb(sk, skb);
if (err)
return err;
--



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