netdev - Re: [PATCH net] xfrm: Guard IPsec anti replay window against replay bitmap

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Message-ID: <523800F2.3050704@windriver.com>
Date:	Tue, 17 Sep 2013 15:12:50 +0800
From:	Fan Du <fan.du@...driver.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
CC:	<davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net] xfrm: Guard IPsec anti replay window against replay
 bitmap



On 2013年09月17日 14:56, Steffen Klassert wrote:
> On Tue, Sep 17, 2013 at 02:26:05PM +0800, Fan Du wrote:
>>
>> diff --git a/net/key/af_key.c b/net/key/af_key.c
>> index 9d58537..911ef03 100644
>> --- a/net/key/af_key.c
>> +++ b/net/key/af_key.c
>> @@ -1098,7 +1098,8 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
>>
>>   	x->id.proto = proto;
>>   	x->id.spi = sa->sadb_sa_spi;
>> -	x->props.replay_window = sa->sadb_sa_replay;
>> +	x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
>> +					(sizeof(x->replay.bitmap) * 8));
>>   	if (sa->sadb_sa_flags&  SADB_SAFLAGS_NOECN)
>>   		x->props.flags |= XFRM_STATE_NOECN;
>>   	if (sa->sadb_sa_flags&  SADB_SAFLAGS_DECAP_DSCP)
>> diff --git a/net/xfrm/xfrm_replay.c b/net/xfrm/xfrm_replay.c
>> index 8dafe6d3..eeca388 100644
>> --- a/net/xfrm/xfrm_replay.c
>> +++ b/net/xfrm/xfrm_replay.c
>> @@ -129,8 +129,7 @@ static int xfrm_replay_check(struct xfrm_state *x,
>>   		return 0;
>>
>>   	diff = x->replay.seq - seq;
>> -	if (diff>= min_t(unsigned int, x->props.replay_window,
>> -			  sizeof(x->replay.bitmap) * 8)) {
>> +	if (diff>= x->props.replay_window) {
>
> So x->props.replay_window will be valid if the state was added with the
> pfkey interface, but what if the netlink interface was used? You should
> also update the netlink part to always hold a valid replay window.
>

Smell positively, v2 in seconds。。。

Thanks, Steffen.


-- 
浮沉随浪只记今朝笑

--fan
--
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