netdev - Re: 2.6.35, netfilter/iptables not working with 32bit userspace + 64bit kernel?

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Message-ID: <20100813164055.14665dw79nab4cjk@naisho.dyndns.info>
Date:	Fri, 13 Aug 2010 16:40:55 +0300
From:	Jussi Kivilinna <jukivili@...il.com>
To:	"Florian Westphal" <fw@...len.de>
Cc:	"Eric Dumazet" <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	"Netfilter Development Mailinglist" <netfilter-devel@...r.kernel.org>
Subject: Re: 2.6.35, netfilter/iptables not working with 32bit userspace +
	64bit kernel?

Thanks!

Is this patch going for stable?

-Jussi

Quoting "Florian Westphal" <fw@...len.de>:

> Eric Dumazet <eric.dumazet@...il.com> wrote:
>> CC netfilter-devel to get more people in touch
>>
>> Thanks !
>>
>> Le vendredi 13 août 2010 à 13:47 +0300, Jussi Kivilinna a écrit :
>> > Hello!
>> >
>> > I have server/firewall running Debian lenny with 32bit userspace and
>> > 64bit kernel. After upgrading from 2.6.34 to 2.6.35, I couldn't get
>> > any new chains work. Simply doing (with 32bit iptables)
>> >
>> >    iptables -N new_chain
>> >    iptables -A OUTPUT -j new_chain
>> >    iptables -A OUTPUT -j ACCEPT
>> >
>> > cause output to freeze. "iptables -L -vn" shows:
>> >
>> > Chain OUTPUT (policy ACCEPT 3397 packets, 637K bytes)
>> >   pkts bytes target     prot opt in     out     source         destination
>> >      3   252 new_chain  all  --  *      *       0.0.0.0/0      0.0.0.0/0
>> >      0     0 ACCEPT     all  --  *      *       0.0.0.0/0      0.0.0.0/0
>> >
>> > Ping shows "ping: sendmsg: Operation not permitted".
>> >
>> > With recompiled 64bit iptables, example above works fine.
>
> You need this patch:
>
> commit f3c5c1bfd430858d3a05436f82c51e53104feb6b
> (netfilter: xtables: make ip_tables reentrant) forgot to
> also compute the jumpstack size in the compat handlers.
>
> Result is that "iptables -I INPUT -j userchain" turns into -j DROP.
>
> Reported by Sebastian Roesner on #netfilter, closes
> http://bugzilla.netfilter.org/show_bug.cgi?id=669.
>
> Note: arptables change is compile-tested only.
>
> Signed-off-by: Florian Westphal <fw@...len.de>
> ---
>  net/ipv4/netfilter/arp_tables.c |    3 +++
>  net/ipv4/netfilter/ip_tables.c  |    3 +++
>  net/ipv6/netfilter/ip6_tables.c |    3 +++
>  3 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/net/ipv4/netfilter/arp_tables.c  
> b/net/ipv4/netfilter/arp_tables.c
> index 6bccba3..4829766 100644
> --- a/net/ipv4/netfilter/arp_tables.c
> +++ b/net/ipv4/netfilter/arp_tables.c
> @@ -1418,6 +1418,9 @@ static int translate_compat_table(const char *name,
>  		if (ret != 0)
>  			break;
>  		++i;
> +		if (strcmp(arpt_get_target(iter1)->u.user.name,
> +		    XT_ERROR_TARGET) == 0)
> +			++newinfo->stacksize;
>  	}
>  	if (ret) {
>  		/*
> diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
> index c439721..3d3b695 100644
> --- a/net/ipv4/netfilter/ip_tables.c
> +++ b/net/ipv4/netfilter/ip_tables.c
> @@ -1749,6 +1749,9 @@ translate_compat_table(struct net *net,
>  		if (ret != 0)
>  			break;
>  		++i;
> +		if (strcmp(ipt_get_target(iter1)->u.user.name,
> +		    XT_ERROR_TARGET) == 0)
> +			++newinfo->stacksize;
>  	}
>  	if (ret) {
>  		/*
> diff --git a/net/ipv6/netfilter/ip6_tables.c  
> b/net/ipv6/netfilter/ip6_tables.c
> index 5359ef4..bad3c7f 100644
> --- a/net/ipv6/netfilter/ip6_tables.c
> +++ b/net/ipv6/netfilter/ip6_tables.c
> @@ -1764,6 +1764,9 @@ translate_compat_table(struct net *net,
>  		if (ret != 0)
>  			break;
>  		++i;
> +		if (strcmp(ip6t_get_target(iter1)->u.user.name,
> +		    XT_ERROR_TARGET) == 0)
> +			++newinfo->stacksize;
>  	}
>  	if (ret) {
>  		/*
> --
> 1.7.1
>
>
>


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