netdev - Re: [PATCH] cipso: don't use IPCB() to locate the CIPSO IP option

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Date:	Fri, 06 Feb 2015 14:51:02 -0800
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Paul Moore <pmoore@...hat.com>, davem@...emloft.net
CC:	linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
	netdev@...r.kernel.org, Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH] cipso: don't use IPCB() to locate the CIPSO IP option

On 2/6/2015 12:03 PM, Paul Moore wrote:
> On Friday, February 06, 2015 02:57:28 PM Paul Moore wrote:
>> Using the IPCB() macro to get the IPv4 options is convenient, but
>> unfortunately NetLabel often needs to examine the CIPSO option outside
>> of the scope of the IP layer in the stack.  While historically IPCB()
>> worked above the IP layer, due to the inclusion of the inet_skb_param
>> struct at the head of the {tcp,udp}_skb_cb structs, recent commit
>> 971f10ec ("tcp: better TCP_SKB_CB layout to reduce cache line misses")
>> reordered the tcp_skb_cb struct and invalidated this IPCB() trick.
>>
>> This patch fixes the problem by creating a new function,
>> cipso_v4_optptr(), which locates the CIPSO option inside the IP header
>> without calling IPCB().  Unfortunately, this isn't as fast as a simple
>> lookup so some additional tweaks were made to limit the use of this
>> new function.
>>
>> Cc: <stable@...r.kernel.org> # 3.18
>> Reported-by: Casey Schaufler <casey@...aufler-ca.com>
>> Signed-off-by: Paul Moore <pmoore@...hat.com>

Tested-by: Casey Schaufler <casey@...aufler-ca.com>
 

> DaveM, I'd prefer this go upstream via the SELinux/security tree so we don't 
> have to worry about syncing up with the netdev tree to get this fix.  Any 
> objections on your part (this patch only touches NetLabel/CIPSO)?
>

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