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Date:   Fri, 15 Feb 2019 12:00:09 -0800 (PST)
From:   David Miller <>
Subject: Re: [PATCH] NETWORKING: avoid use IPCB in cipso_v4_error

From: Paul Moore <>
Date: Fri, 15 Feb 2019 14:02:31 -0500

> On Thu, Feb 14, 2019 at 11:43 AM David Miller <> wrote:
>> From: Nazarov Sergey <>
>> Date: Tue, 12 Feb 2019 18:10:03 +0300
>> > Since cipso_v4_error might be called from different network stack layers, we can't safely use icmp_send there.
>> > icmp_send copies IP options with ip_option_echo, which uses IPCB to take access to IP header compiled data.
>> > But after commit 971f10ec ("tcp: better TCP_SKB_CB layout to reduce cache line misses"), IPCB can't be used
>> > above IP layer.
>> > This patch fixes the problem by creating in cipso_v4_error a local copy of compiled IP options and using it with
>> > introduced __icmp_send function. This looks some overloaded, but in quite rare error conditions only.
>> >
>> > The original discussion is here:
>> >
>> >
>> > Signed-off-by: Sergey Nazarov <>
>> This problem is not unique to Cipso, net/atm/clip.c's error handler
>> has the same exact issue.
>> I didn't scan more of the tree, there are probably a couple more
>> locations as well.
> David, are you happy with Sergey's solution as a fix for this?
> If so, would you prefer a respin of this patch to apply the to the
> other broken callers (e.g. net/atm/clip.c), or would you rather merge
> this patch and deal with the other callers in separate patches?

I'd like the other broken callers to be handled.

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