netdev - Re: xfrm: Fix initialize repl field of struct xfrm

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Message-ID: <4D86F4EA.6030909@cn.fujitsu.com>
Date:	Mon, 21 Mar 2011 14:49:14 +0800
From:	Wei Yongjun <yjwei@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org, steffen.klassert@...unet.com
Subject: Re: xfrm: Fix initialize repl field of struct xfrm_state


> From: Wei Yongjun <yjwei@...fujitsu.com>
> Date: Mon, 21 Mar 2011 14:36:45 +0800
>
>> Sorry for not said clearly, at the first time I want to do like this. 
>> But when I grep 'xfrm_init_state', it be used in many place, not
>> any pf_key, but also XFRM MIGRATE, ipcomp, ipcomp6. So I did this ugly
>> patch by add this to xfrm_init_state() to avoid dup code.
>>
>> Not sure whether the other case like ipcomp/ipcomp6 etc can cause panic, if
>> it panic, maybe we can fix by introduce new xfrm_init_replay() function
>> like to assign the default reply function.
>>   int xfrm_init_replay(struct xfrm_state *x)
>>   {
>>   	x->repl = &xfrm_replay_legacy;
>>   	return 0;
>>   }
>> and change the orig xfrm_init_replay to xfrm_update_replay()? 
>> Or dup those code to all used place?
>>
>> If I was wrong, I will fix this by adding the necessary call to af_key.c.
> Ok, thanks for the explanation.
>
> I think there is a simple way out of this:
>
> 1) Rename current xfrm_init_state to __xfrm_init_state, add
>    "bool init_replay" argument.  Add the xfrm_init_replay()
>    call, as in your patch, but conditionalized on this boolean.
>
> 2) Implement xfrm_init_state as inline, which calls
>    __xfrm_init_state(..., true)
>
> 3) Replace xfrm_init_state() call in xfrm_user.c with
>    __xfrm_init_state(..., false)
>
> This seems to avoid all the problems.  We don't need to touch every
> caller, and we avoid initializing the replay state twice in xfrm_user
>
> Ok?

This OK, I will do this change, thanks.

>
>
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