netdev - Re: [PATCH] xfrm: Zero padding when dumping algos and encap

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Date:   Thu, 9 Feb 2023 07:08:57 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Sabrina Dubroca <sd@...asysnail.net>
Cc:     Hyunwoo Kim <v4bel@...ori.io>, steffen.klassert@...unet.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, imv4bel@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] xfrm: Zero padding when dumping algos and encap

On Wed, Feb 08, 2023 at 02:15:47PM +0100, Sabrina Dubroca wrote:
>
> Do you mean as a replacement for Hyunwoo's patch, or that both are
> needed? pfkey_msg2xfrm_state doesn't always initialize encap_sport and
> encap_dport (and calg->alg_key_len, but you're not using that in
> copy_to_user_calg), so I guess you mean both patches.

It's meant to be a replacement but yes we should still zero x->encap
because that will leak out in other ways, e.g., on the wire.

Hyunwoo, could you please repost your patch just for x->encap?

> > +static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb)
> > +{
> > +	struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*ep));
> 
> XFRMA_ENCAP

Good catch.  I will repost the patch.

> > +	uep->encap_oa = ep->encap_oa;
> 
> Should that be a memcpy? At least that's how xfrm_user.c usually does
> copies of xfrm_address_t.

It doesn't really matter.

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