linux-kernel - Re: [netfilter-core] [PATCH 2.6.19-rc6] netfilter: fix panic on ip_conntrack_h323 with CONFIG_IP_NF_CT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Thu, 16 Nov 2006 12:30:02 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Faidon Liambotis <paravoid@...ian.org>
CC:	coreteam@...filter.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: [netfilter-core] [PATCH 2.6.19-rc6] netfilter: fix panic on	ip_conntrack_h323
 with CONFIG_IP_NF_CT_ACCT

Faidon Liambotis wrote:
> H.323 connection tracking code calls ip_ct_refresh_acct() when
> processing RCFs and URQs but passes NULL as the skb.
> When CONFIG_IP_NF_CT_ACCT is enabled, the connection tracking core tries
> to derefence the skb, which results in an obvious panic.
> A similar fix was applied on the SIP connection tracking code some time
> ago.

Good catch, but the fix is wrong and will lead to double accounting
of the skb. The correct fix is to use ip_ct_refresh() instead,
which only updates the timeout. Can you send a new patch please?

> Signed-off-by: Faidon Liambotis <paravoid@...ian.org>
> 
> --- a/net/ipv4/netfilter/ip_conntrack_helper_h323.c	2006-11-15 19:07:50.000000000 +0200
> +++ b/net/ipv4/netfilter/ip_conntrack_helper_h323.c	2006-11-16 11:09:46.000000000 +0200
> @@ -1417,7 +1417,7 @@ static int process_rcf(struct sk_buff **
>  		DEBUGP
>  		    ("ip_ct_ras: set RAS connection timeout to %u seconds\n",
>  		     info->timeout);
> -		ip_ct_refresh_acct(ct, ctinfo, NULL, info->timeout * HZ);
> +		ip_ct_refresh_acct(ct, ctinfo, *pskb, info->timeout * HZ);
>  
>  		/* Set expect timeout */
>  		read_lock_bh(&ip_conntrack_lock);
> @@ -1465,7 +1465,7 @@ static int process_urq(struct sk_buff **
>  	info->sig_port[!dir] = 0;
>  
>  	/* Give it 30 seconds for UCF or URJ */
> -	ip_ct_refresh_acct(ct, ctinfo, NULL, 30 * HZ);
> +	ip_ct_refresh_acct(ct, ctinfo, *pskb, 30 * HZ);
>  
>  	return 0;
>  }
> 

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/