Date: Sun, 4 Apr 2004 00:32:30 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Ryan Sommers <ryans@gamersimpact.com> Cc: current@freebsd.org Subject: Re: Panic from bad length parameter in bind (Possible DOS attack) Message-ID: <20040403223230.GC613@darkness.comp.waw.pl> In-Reply-To: <49165.65.103.5.228.1081027268.squirrel@www2.neuroflux.com> References: <49165.65.103.5.228.1081027268.squirrel@www2.neuroflux.com>
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[-- Attachment #1 --] On Sat, Apr 03, 2004 at 02:21:08PM -0700, Ryan Sommers wrote: +> Whenever I supply a length of 4 as the final bind parameter I get the +> following panic. Looks like bind returns fine, however, when the program +> exits it stumbles over some mutex associated with the descriptor. The +> mutex passed to mtx_destroy() has MTX_RECURSED set. I attempted to find +> where the call to bind was clobbering the mutex but couldn't. I attached +> the simple program to exploit this. I was able to do it as a regular user. Yes, could you try this patch: http://people.freebsd.org/~pjd/patches/tcp_usrreq.c.patch -- Pawel Jakub Dawidek http://www.FreeBSD.org pjd@FreeBSD.org http://garage.freebsd.pl FreeBSD committer Am I Evil? Yes, I Am! [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAbzt+ForvXbEpPzQRAsqtAJ4ictPclPyW5vZWENyEJo3ipiGzbQCgp58h Te/ADQaxPkVzM/0JNPapyAs= =uVJG -----END PGP SIGNATURE-----help
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