netdev - Re: [PATCH net] ipv6: un-do: defrag: drop non-last frags smaller than min mtu

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Date:   Fri, 5 Apr 2019 06:50:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Captain Wiggum <captwiggum@...il.com>
Cc:     Florian Westphal <fw@...len.de>,
        Eric Dumazet <edumazet@...gle.com>,
        Peter Oskolkov <posk@...gle.com>, netdev@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH net] ipv6: un-do: defrag: drop non-last frags smaller
 than min mtu

On Thu, Apr 04, 2019 at 06:18:30PM -0600, Captain Wiggum wrote:
> Hi Greg,
> 
> A previous bad patch breaks 18 test cases for IPv6 fragment headers.
> This has already been un-done in upstream, but not in any of the LTS.
> However two upstream patches are first needed to cover a DoS vulnerability.
> 
> For background, there are two mail threads in [netdev] on this subject:
> 1) Subject: TAHI testing fails for IPv6 Fragments in Kernel 4.9 (from
> captwiggum)
> 2) Subject: Please merge IPv6 fix for drop fragment smaller than MTU
> (from captwiggum)
> 
> Two patches from upstream needed first to cover the DoS:
> 
> commit d4289fcc9b16b89619ee1c54f829e05e56de8b9a
> net: IP6 defrag: use rbtrees for IPv6 defrag
> 
> commit 997dd96471641e147cb2c33ad54284000d0f5e35
> net: IP6 defrag: use rbtrees in nf_conntrack_reasm.c
> 
> One undo-patch to fix the IPv6 fragment headers:
> 
> ipv6: defrag: drop non-last frags smaller than min mtu
> UN-DO: commit a8444b1ccb20339774af58e40ad42296074fb484

For what kernel version(s) do these patches need to be applied?

thanks,

greg k-h