netdev - Re: [RFC PATCH 2/2] xfrm: force a garbage collection after deleting a policy

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Date:	Thu, 23 May 2013 16:26 -0400
From:	Paul Moore <pmoore@...hat.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	netdev@...r.kernel.org, selinux@...ho.nsa.gov, omoris@...hat.com,
	pwouters@...hat.com
Subject: Re: [RFC PATCH 2/2] xfrm: force a garbage collection after deleting a policy

On Thursday, May 23, 2013 11:29:58 PM Sergei Shtylyov wrote:
> Hello.
> 
> On 05/23/2013 11:07 PM, Paul Moore wrote:
> > In some cases after deleting a policy from the SPD the policy would
> > remain in the dst/flow/route cache for an extended period of time
> > which caused problems for SELinux as its dynamic network access
> > controls key off of the number of XFRM policy and state entries.
> > This patch corrects this problem by forcing a XFRM garbage collection
> > whenever a policy is sucessfully removed.
> > 
> > Reported-by: Ondrej Moris <omoris@...hat.com>
> > Signed-off-by: Paul Moore <pmoore@...hat.com>
> > ---
> > 
> >   include/net/xfrm.h     |    6 ++++++
> >   net/key/af_key.c       |    4 ++++
> >   net/xfrm/xfrm_policy.c |    3 ++-
> >   net/xfrm/xfrm_user.c   |    2 ++
> >   4 files changed, 14 insertions(+), 1 deletion(-)
> > 
> > diff --git a/include/net/xfrm.h b/include/net/xfrm.h
> > index ae16531..918e4cd 100644
> > --- a/include/net/xfrm.h
> > +++ b/include/net/xfrm.h
> 
> [...]
> 
> > @@ -1194,6 +1196,10 @@ static inline int xfrm6_policy_check_reverse(struct
> > sock *sk, int dir,> 
> >   {
> >   
> >   	return 1;
> >   
> >   }
> > 
> > +static inline void xfrm_garbage_collect(struct net *net)
> > +{
> > +	return;
> 
>      Not needed.
> 
> > +}

True, I added it for the sake of completeness, but I'll go ahead and remove 
it.

-- 
paul moore
security and virtualization @ redhat

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