From mboxrd@z Thu Jan  1 00:00:00 1970
Message-Id: <20070504103159.389910222@chello.nl>
References: <20070504102651.923946304@chello.nl>
Date: Fri, 04 May 2007 12:27:08 +0200
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: [PATCH 17/40] netvm: filter emergency skbs.
Content-Disposition: inline; filename=netvm-sk_filter.patch
Sender: owner-linux-mm@kvack.org
Return-Path: <owner-linux-mm@kvack.org>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, Trond Myklebust <trond.myklebust@fys.uio.no>, Thomas Graf <tgraf@suug.ch>, David Miller <davem@davemloft.net>, James Bottomley <James.Bottomley@SteelEye.com>, Mike Christie <michaelc@cs.wisc.edu>, Andrew Morton <akpm@linux-foundation.org>, Daniel Phillips <phillips@google.com>
List-ID: <linux-mm.kvack.org>

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 <a.p.zijlstra@chello.nl>
---
 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)

--

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