netdev - Re: [Patch net v2] xfrm: clean up xfrm protocol checks

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Date:   Mon, 25 Mar 2019 18:42:58 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev@...r.kernel.org,
        syzbot+0bf0519d6e0de15914fe@...kaller.appspotmail.com,
        Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [Patch net v2] xfrm: clean up xfrm protocol checks

On Fri, Mar 22, 2019 at 04:26:19PM -0700, Cong Wang wrote:
> In commit 6a53b7593233 ("xfrm: check id proto in validate_tmpl()")
> I introduced a check for xfrm protocol, but according to Herbert
> IPSEC_PROTO_ANY should only be used as a wildcard for lookup, so
> it should be removed from validate_tmpl().
> 
> And, IPSEC_PROTO_ANY is expected to only match 3 IPSec-specific
> protocols, this is why xfrm_state_flush() could still miss
> IPPROTO_ROUTING, which leads that those entries are left in
> net->xfrm.state_all before exit net. Fix this by replacing
> IPSEC_PROTO_ANY with zero.
> 
> This patch also extracts the check from validate_tmpl() to
> xfrm_id_proto_valid() and uses it in parse_ipsecrequest().
> With this, no other protocols should be added into xfrm.
> 
> Fixes: 6a53b7593233 ("xfrm: check id proto in validate_tmpl()")
> Reported-by: syzbot+0bf0519d6e0de15914fe@...kaller.appspotmail.com
> Cc: Steffen Klassert <steffen.klassert@...unet.com>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
> ---
>  include/net/xfrm.h      | 17 +++++++++++++++++
>  net/ipv6/xfrm6_tunnel.c |  2 +-
>  net/key/af_key.c        |  4 +++-
>  net/xfrm/xfrm_state.c   |  2 +-
>  net/xfrm/xfrm_user.c    | 14 +-------------
>  5 files changed, 23 insertions(+), 16 deletions(-)

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt