Date: Thu, 1 Feb 2001 09:59:57 +0100 From: Michel Talon <michel@lpthe.jussieu.fr> To: freebsd-stable@FreeBSD.ORG Subject: Re: URG: IPFW and kernel msgbuf corruption Message-ID: <20010201095957.A469@lpthe.jussieu.fr> In-Reply-To: <3A784846.27E560E9@jonny.eng.br> References: <3A784846.27E560E9@jonny.eng.br>
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On Wed, Jan 31, 2001 at 03:15:51PM -0200, Joao Carlos Mendes Luis wrote: > Hi, > > I've seen some messages in the mail archives about this, but none got to > the real problem! FreeBSD -stable from yesterday (2000.01.30) has a bug in > ipfw logging that corrupts kernel msgbuf (dmesg) area. Maybe some other > modules have this bug also, but I could not reproduce them. This bug is > definitely not present in 4.2-RELEASE, as I have downgraded my system with > cvsup and repeated the tests. > > My test procedure is to attack my test system with nmap, and look for the > ipfw log messages. They corrupt the whole msgbuf area, like this: > > bash-2.04# dmesg > >ipfw: 20050 Deny TCP 200.255.125.133:39372 200.255.125.137:6007 in via fxp0 > bash-2.04# > > Only one line of messages? I have 80k of message buffer defined: > I had dmesg corruption recently. I have redone make buildworld make buildkernel make installkernel make installworld and the corruption disappeared. Perhaps you had incorrectly synchronized world and kernel. -- Michel Talon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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