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29 lines
819 B
29 lines
819 B
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Subject: [PATCH 19/31] netvm: filter emergency skbs.
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Patch-mainline: not yet
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Toss all emergency packets not for a SOCK_MEMALLOC socket. This ensures our
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precious memory reserve doesn't get stuck waiting for user-space.
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The correctness of this approach relies on the fact that networks must be
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assumed lossy.
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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
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---
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net/core/filter.c | 3 +++
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1 file changed, 3 insertions(+)
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--- a/net/core/filter.c
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+++ b/net/core/filter.c
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@@ -82,6 +82,9 @@ int sk_filter(struct sock *sk, struct sk
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int err;
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struct sk_filter *filter;
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+ if (skb_emergency(skb) && !sk_has_memalloc(sk))
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+ return -ENOMEM;
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+
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err = security_sock_rcv_skb(sk, skb);
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if (err)
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return err;
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