netdev - Re: [PATCH] netlabel: If PF_INET6, check sk

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Date:   Mon, 13 Nov 2017 17:13:34 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Richard Haines <richard_c_haines@...nternet.com>
Cc:     selinux@...ho.nsa.gov, netdev@...r.kernel.org
Subject: Re: [PATCH] netlabel: If PF_INET6, check sk_buff ip header version

On Mon, Nov 13, 2017 at 3:54 PM, Richard Haines
<richard_c_haines@...nternet.com> wrote:
> When resolving a fallback label, check the sk_buff version as it
> is possible (e.g. SCTP) to have family = PF_INET6 while
> receiving ip_hdr(skb)->version = 4.
>
> Signed-off-by: Richard Haines <richard_c_haines@...nternet.com>
> ---
>  net/netlabel/netlabel_unlabeled.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)

Thanks Richard.

Acked-by: Paul Moore <paul@...l-moore.com>

> diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
> index 22dc1b9..c070dfc 100644
> --- a/net/netlabel/netlabel_unlabeled.c
> +++ b/net/netlabel/netlabel_unlabeled.c
> @@ -1472,6 +1472,16 @@ int netlbl_unlabel_getattr(const struct sk_buff *skb,
>                 iface = rcu_dereference(netlbl_unlhsh_def);
>         if (iface == NULL || !iface->valid)
>                 goto unlabel_getattr_nolabel;
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +       /* When resolving a fallback label, check the sk_buff version as
> +        * it is possible (e.g. SCTP) to have family = PF_INET6 while
> +        * receiving ip_hdr(skb)->version = 4.
> +        */
> +       if (family == PF_INET6 && ip_hdr(skb)->version == 4)
> +               family = PF_INET;
> +#endif /* IPv6 */
> +
>         switch (family) {
>         case PF_INET: {
>                 struct iphdr *hdr4;
> --
> 2.13.6

-- 
paul moore
www.paul-moore.com