Subject: [PATCH 17/40] netvm: filter emergency skbs.

From: Peter Zijlstra <[email-masked]>
Date: Fri, 04 May 2007 12:27:08 +0200

Toss all emergency packets not for a SOCK_VMIO socket. This ensures our
precious memory reserve doesn't get stuck waiting for user-space.

Signed-off-by: Peter Zijlstra <[email-masked]>
---
 include/net/sock.h |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6-git/include/net/sock.h
===================================================================
--- linux-2.6-git.orig/include/net/sock.h	2007-02-14 16:15:49.000000000 +0100
+++ linux-2.6-git/include/net/sock.h	2007-02-14 16:16:27.000000000 +0100
@@ -926,6 +926,9 @@ static inline int sk_filter(struct sock 
 {
 	int err;
 	struct sk_filter *filter;
+
+	if (skb_emergency(skb) && !sk_has_vmio(sk))
+		return -EPERM;
 	
 	err = security_sock_rcv_skb(sk, skb);
 	if (err)

--