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Date:   Mon, 11 May 2020 16:09:50 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     David.Laight@...LAB.COM
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net/ipv4/raw Optimise ipv4 raw sends when
 IP_HDRINCL set.

From: David Laight <David.Laight@...LAB.COM>
Date: Mon, 11 May 2020 21:28:18 +0000

> In this case the "modified in userspace meanwhile" just breaks the
> application - it isn't any kind of security issue.

The kernel must provide correct behavior based upon the stable IP
header that it copies into userspace.  I'm not moving on this
requirement, sorry.

I'm sure you have great reasons why you can't use normal UDP sockets
for RTP traffic, but that's how you will get a cached route and avoid
this exact problem.

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