netdev - Re: [PATCH net-next] {selinux, af_key} Rework pfkey_sadb2xfrm_user_sec

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Message-ID: <20131017095148.GC7660@secunet.com>
Date:	Thu, 17 Oct 2013 11:51:48 +0200
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	Fan Du <fan.du@...driver.com>
Cc:	Paul Moore <paul@...l-moore.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] {selinux, af_key} Rework
 pfkey_sadb2xfrm_user_sec_ctx

On Thu, Oct 17, 2013 at 09:34:53AM +0800, Fan Du wrote:
> 
> 
> On 2013年10月16日 23:15, Paul Moore wrote:
> >
> >The fact that you are now changing sadb_x_sec_ctx->sadb_x_sec_len whenever
> >pfkey_sadb2xfrm_user_sec_ctx() is called raises an eyebrow.  Can you elaborate
> >on why this is not a problem?
> >
> Thanks for your attention, Paul.
> 
> sadb_x_sec_ctx is extra headers passed down from user space, the usage of
> of this data structure falls down to one of pfkey_funcs function only for
> one time, more specifically speaking, it's only used by SELINUX for security
> checking for each operation. In other words, sadb_x_sec_ctx involves with a
> one shot business here. So the original codes seems do a lots of extra job
> which could easily be avoid using casting operation.
> 

Since the selinux people have to live with that change in the fist place,
I'd like to see an ack of one of the selinux maintainers before I take
in into ipsec-next, Paul?
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