linux-kernel - Memory exhaust issue with only IPsec policies configured on continuous traffic

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]

Message-ID: <F0B93D0554724543876B9A180DC988575B7430@039-SN1MPN1-001.039d.mgd.msft.net>
Date:	Wed, 9 May 2012 09:23:16 +0000
From:	Agarwal Nikhil-B38457 <B38457@...escale.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Memory exhaust issue with only IPsec policies configured on
 continuous traffic

Hi all,
               In a typical scenario, when IPSEC policies are configured in the system but SA is not present or negotiation fails or IKE daemon is not running.  The current behavior of xfrm is to send those matching packets to blackhole route.  i.e. xfrm_bundle_lookup returns a bundle with null route and xfrm_lookup returns a blackhole route.

For each of these packet a dst_alloc is called in ipv4_blackhole_route. However when these skbs get free and their dst's get discarded using dst_free and the garbage collector is scheduled using cancel_delayed_work and schedule_delayed_work.

If the packets are coming continuously garbage collector may not get scheduled and large amount of memory is stuck to be freed causing the system to go into non-recoverable state.

Any ideas? 

Regards
Nikhil

--
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/