Date: Wed, 24 Nov 2010 07:24:02 -0500 (EST) From: Josh Bressers <bressers@...hat.com> To: oss-security@...ts.openwall.com Cc: Petr Matousek <pmatouse@...hat.com>, coley@...us.mitre.org Subject: Re: CVE request: kernel: L2TP send buffer allocation size overflows I don't understand this comment. Is he saying every send/recv in the kernel suffers from this? The below CVE id really only applies to the l2tp overflows. Thanks. -- JB ----- "Thomas Biege" <thomas@...e.de> wrote: > A comment from our kernel maintainer Jeff: > "That applies to overflows for any send/recv not just the l2tp ones. I > can use > that CVE if there isn't another one, though." > > Is this known? Should we use only on CVE-ID here? > > > Bye > Thomas > > > Am Mittwoch 10 November 2010 20:44:11 schrieb Josh Bressers: > > Please use CVE-2010-4160. > > > > Thanks. > > > > > "Both PPPoL2TP (in net/l2tp/l2tp_ppp.c, pppol2tp_sendmsg()) and > > > IPoL2TP (in > > > net/l2tp/l2tp_ip.c, l2tp_ip_sendmsg()) make calls to > sock_wmalloc() > > > that > > > perform arithmetic on the size argument without any maximum bound. > As > > > a result, > > > by issuing sendto() calls with very large sizes, this allocation > size > > > will wrap > > > and result in a small buffer being allocated, leading to ugliness > > > immediately > > > after (probably kernel panics due to bad sk_buff tail position, > but > > > possibly > > > kernel heap corruption)." > > > > > > Credit: Dan Rosenberg > > > > > > Reference: > > > http://www.spinics.net/lists/netdev/msg145673.html > > > https://bugzilla.redhat.com/show_bug.cgi?id=651892 > > > > > > Thanks, > > > -- > > > Petr Matousek / Red Hat Security Response Team > > > > -- > Thomas Biege <thomas@...e.de>, SUSE LINUX, Security Support & > Auditing > SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nuernberg) > -- > Wer aufhoert besser werden zu wollen, hoert auf gut zu sein. > -- Marie von Ebner-Eschenbach
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