src/patches/suse-2.6.27.25/patches.suse/SoN-22-netvm-sk_filter.patch

   1 From: Peter Zijlstra <a.p.zijlstra@chello.nl>
   2 Subject: netvm: filter emergency skbs.
   3 Patch-mainline: No
   4 References: FATE#303834
   5
   6 Toss all emergency packets not for a SOCK_MEMALLOC socket. This ensures our
   7 precious memory reserve doesn't get stuck waiting for user-space.
   8
   9 The correctness of this approach relies on the fact that networks must be
  10 assumed lossy.
  11
  12 Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
  13 Acked-by: Neil Brown <neilb@suse.de>
  14 Acked-by: Suresh Jayaraman <sjayaraman@suse.de>
  15
  16 ---
  17  net/core/filter.c |    3 +++
  18  1 file changed, 3 insertions(+)
  19
  20 Index: linux-2.6/net/core/filter.c
  21 ===================================================================
  22 --- linux-2.6.orig/net/core/filter.c
  23 +++ linux-2.6/net/core/filter.c
  24 @@ -81,6 +81,9 @@ int sk_filter(struct sock *sk, struct sk
  25         int err;
  26         struct sk_filter *filter;
  27
  28 +       if (skb_emergency(skb) && !sk_has_memalloc(sk))
  29 +               return -ENOMEM;
  30 +
  31         err = security_sock_rcv_skb(sk, skb);
  32         if (err)
  33                 return err;