netdev - Re: [PATCH 1/7] xfrm: remove policy lock when accessing policy->walk.dead

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Message-ID: <20100330143048.GB6840@gondor.apana.org.au>
Date:	Tue, 30 Mar 2010 22:30:48 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Timo Teräs <timo.teras@....fi>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 1/7] xfrm: remove policy lock when accessing
	policy->walk.dead

On Tue, Mar 30, 2010 at 04:33:52PM +0300, Timo Teräs wrote:
> Herbert Xu wrote:
>> On Tue, Mar 30, 2010 at 03:41:02PM +0300, Timo Teräs wrote:
>>> So it'd make more sense to nuke the hashes entirely for
>>> per-socket policies?
>>
>> Absolutely.
>
> I checked now the xfrm_user, and mostly it seems to prevent
> modification to per-socket policies.
>
> The only exception is XFRM_MSG_POLEXPIRE handler
> xfrm_add_pol_expire(). It calls xfrm_policy_byid() without
> verifying the direction, and can thus complete successfully on
> a per-socket policy. This can actually result in per-socket
> policy deletion via netlink.

That shouldn't be possible since the directions used by socket
policies cannot be set through xfrm_user.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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