Re: [PATCH 4.4 018/101] netfilter: synproxy: fix conntrackd interaction

[Stefan Bader]

On 03.07.2017 15:34, Greg Kroah-Hartman wrote:
> 4.4-stable review patch.  If anyone has any objections, please let me know.

We found that pulling below patch into stable trees without also pulling

commit 9c3f3794926a997b1cab6c42480ff300efa2d162
Author: Liping Zhang <zlpnobody@xxxxxxxxx>
Date:   Sat Mar 25 16:35:29 2017 +0800

    netfilter: nf_ct_ext: fix possible panic after nf_ct_extend_unregister

will result in a regression, at least in 4.4.y[1]. Stable maintainers who picked
up below patch might want to consider picking up above fix.

-Stefan


[1] http://bugs.launchpad.net/bugs/1709032
> 
> ------------------
> 
> From: Eric Leblond <eric@xxxxxxxxx>
> 
> commit 87e94dbc210a720a34be5c1174faee5c84be963e upstream.
> 
> This patch fixes the creation of connection tracking entry from
> netlink when synproxy is used. It was missing the addition of
> the synproxy extension.
> 
> This was causing kernel crashes when a conntrack entry created by
> conntrackd was used after the switch of traffic from active node
> to the passive node.
> 
> Signed-off-by: Eric Leblond <eric@xxxxxxxxx>
> Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> 
> ---
>  net/netfilter/nf_conntrack_netlink.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> --- a/net/netfilter/nf_conntrack_netlink.c
> +++ b/net/netfilter/nf_conntrack_netlink.c
> @@ -45,6 +45,8 @@
>  #include <net/netfilter/nf_conntrack_zones.h>
>  #include <net/netfilter/nf_conntrack_timestamp.h>
>  #include <net/netfilter/nf_conntrack_labels.h>
> +#include <net/netfilter/nf_conntrack_seqadj.h>
> +#include <net/netfilter/nf_conntrack_synproxy.h>
>  #ifdef CONFIG_NF_NAT_NEEDED
>  #include <net/netfilter/nf_nat_core.h>
>  #include <net/netfilter/nf_nat_l4proto.h>
> @@ -1798,6 +1800,8 @@ ctnetlink_create_conntrack(struct net *n
>  	nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
>  	nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
>  	nf_ct_labels_ext_add(ct);
> +	nfct_seqadj_ext_add(ct);
> +	nfct_synproxy_ext_add(ct);
>  
>  	/* we must add conntrack extensions before confirmation. */
>  	ct->status |= IPS_CONFIRMED;
> 
>

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