From owner-freebsd-stable Sun Feb 25 10:21:16 2001 Delivered-To: freebsd-stable@freebsd.org Received: from ady.warpnet.ro (ftp.warpnet.ro [194.102.224.8]) by hub.freebsd.org (Postfix) with ESMTP id 9425D37B401; Sun, 25 Feb 2001 10:20:37 -0800 (PST) (envelope-from ady@warpnet.ro) Received: from localhost (ady@localhost) by ady.warpnet.ro (8.9.3/8.9.3) with ESMTP id UAA00953; Sun, 25 Feb 2001 20:26:40 +0200 (EET) (envelope-from ady@warpnet.ro) Date: Sun, 25 Feb 2001 20:26:40 +0200 (EET) From: Adrian Penisoara To: freebsd-stable@freebsd.org, freebsd-net@freebsd.org Subject: Kernel crush due to frag attack Message-ID: MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="0-693727142-983125600=:446" Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mime@docserver.cac.washington.edu for more info. --0-693727142-983125600=:446 Content-Type: TEXT/PLAIN; charset=US-ASCII Hi, As we are facing a heavy fragments attack (40-60byte packets in a ~ 1000 pkts/sec flow) I see some sporadic panics. Kernel/world is 4.2-STABLE as of 18 Jan 2001 -- it's a production machine and I hadn't yet the chance for another update; if it's been fixed in the mean time I would be glad to hear it... I have attached a gdb trace and a snip of a tcpdump log. When I rebuilt the kernel with debug options it seemed to crush less often. I remember that at the time of this panic I had an ipfw rule to deny IP fragments. If you need further data just ask, I'd be glad to help, Ady (@warpnet.ro) --0-693727142-983125600=:446 Content-Type: TEXT/PLAIN; charset=X-UNKNOWN; name="gdb.log" Content-Transfer-Encoding: BASE64 Content-ID: Content-Description: gdb -k log Content-Disposition: attachment; filename="gdb.log" U2NyaXB0IHN0YXJ0ZWQgb24gU3VuIEZlYiAyNSAyMDowMDoxNCAyMDAxDQpH TlUgZ2RiIDQuMTgNDQpDb3B5cmlnaHQgMTk5OCBGcmVlIFNvZnR3YXJlIEZv dW5kYXRpb24sIEluYy4NDQpHREIgaXMgZnJlZSBzb2Z0d2FyZSwgY292ZXJl ZCBieSB0aGUgR05VIEdlbmVyYWwgUHVibGljIExpY2Vuc2UsIGFuZCB5b3Ug YXJlDQ0Kd2VsY29tZSB0byBjaGFuZ2UgaXQgYW5kL29yIGRpc3RyaWJ1dGUg Y29waWVzIG9mIGl0IHVuZGVyIGNlcnRhaW4gY29uZGl0aW9ucy4NDQpUeXBl ICJzaG93IGNvcHlpbmciIHRvIHNlZSB0aGUgY29uZGl0aW9ucy4NDQpUaGVy ZSBpcyBhYnNvbHV0ZWx5IG5vIHdhcnJhbnR5IGZvciBHREIuICBUeXBlICJz aG93IHdhcnJhbnR5IiBmb3IgZGV0YWlscy4NDQpUaGlzIEdEQiB3YXMgY29u ZmlndXJlZCBhcyAiaTM4Ni11bmtub3duLWZyZWVic2QiLg0NCihrZ2RiKSBz eW1ib2wtZmlsZSBrZXJuZWwuZGVidWcNDQpSZWFkaW5nIHN5bWJvbHMgZnJv 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