netdev - Re: [PATCH ipsec v5] xfrm: replay: Fix ESN wrap around for GSO

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Message-ID: <YzaEk6Wu5FwT5X18@gondor.apana.org.au>
Date:   Fri, 30 Sep 2022 13:54:27 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Christian Langrock <christian.langrock@...unet.com>
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH ipsec v5] xfrm: replay: Fix ESN wrap around for GSO

On Fri, Sep 30, 2022 at 07:40:24AM +0200, Christian Langrock wrote:
.
> diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
> index 9a5e79a38c67..c470a68d9c88 100644
> --- a/net/xfrm/xfrm_output.c
> +++ b/net/xfrm/xfrm_output.c
> @@ -738,7 +738,7 @@ int xfrm_output(struct sock *sk, struct sk_buff *skb)
>  		skb->encapsulation = 1;
>  
>  		if (skb_is_gso(skb)) {
> -			if (skb->inner_protocol)
> +			if (skb->inner_protocol || xfrm_replay_overflow_check(x, skb))
>  				return xfrm_output_gso(net, sk, skb);

The xfrm_state is unlocked at this point.  So how can you safely
check against a shared state from xfrm_state?

Cheers,
-- 
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