Date: Mon, 14 Sep 2009 06:57:44 +0200 From: Willy Tarreau <w@....eu> To: Eugene Teo <eugeneteo@...nel.sg> Cc: oss-security@...ts.openwall.com, "Steven M. Christey" <coley@...us.mitre.org>, Greg KH <gregkh@...e.de> Subject: Re: CVE-2009-2903 kernel: appletalk: denial of service when handling IP tunnelled over DDP datagrams Hi Eugene, On Mon, Sep 14, 2009 at 08:57:02AM +0800, Eugene Teo wrote: > The check for the ipddpN device in the handle_ip_over_ddp() function > returns -NODEV to the atalk_rcv() function when the device does not > exist. The atalk_rcv() function then directly returns that value to its > caller. There is a missing call to kfree_skb() in these unaccepted > IP-DDP datagram that can exhaust the kernel memory eventually. It > affects Linux hosts with appletalk and ipddp modules loaded, that are > attached to the same link. Thanks to Mark Smith for reporting this issue > to us. > > net-next-2.6 commit: > http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commit;h=ffcfb8db540ff879c2a85bf7e404954281443414 > > > Possible mitigation method: > https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-2903#c3 > > Reference: > https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-2903 > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=Documentation/networking/ipddp.txt;h=661a5558dd8e928f15771c07ef34b3ee9cb81e57;hb=HEAD > > Greg, this should go to -stable. Davem generally handles his own -stable queue for the net subsystem and submits fixes himself, but that's nice to notify about upcoming patches in case it gets missed ! > Willy, this affects upstream 2.4 I believe. Indeed, it seems so. I'm queuing it up for next release. I will have to review it since the changes are not obvious. If you're aware of any reproducer, I'd be glad to get it (in private) ; I'd like to at least ensure I don't break the driver while trying to fix it ! Thanks! Willy
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