Date: Fri, 7 Sep 2012 11:36:56 +0200 From: Petr Matousek <pmatouse@...hat.com> To: akuster <akuster@...sta.com> Cc: oss-security@...ts.openwall.com Subject: Re: CVE Request -- kernel: net: slab corruption due to improper synchronization around inet->opt Hi, On Fri, Aug 31, 2012 at 12:37:58PM -0700, akuster wrote: > Is there a range of affected kernel versions? > > Was this issue introduced by 1c32c5ad6fac8cee1a77449f5abf211e911ff830? the race seems to be present even before this commit. Petr > > - Armin > > On 08/31/2012 09:11 AM, Petr Matousek wrote: > > Description of the problem: > > Lack proper synchronization to manipulate inet->opt ip_options can lead > > to system crash. > > > > Problem is that ip_make_skb() calls ip_setup_cork() and ip_setup_cork() > > possibly makes a copy of ipc->opt (struct ip_options), without any > > protection against another thread manipulating inet->opt. Another thread > > can change inet->opt pointer and free old one under us. > > > > Given right server application (setting socket options and processing > > traffic over the same socket at the same time), remote attacker could > > use this flaw to crash the system. More likely though, local > > unprivileged user could use this flaw to crash the system. > > > > Upstream fix: > > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=f6d8bd051c391c1c0458a30b2a7abcd939329259 > > > > Thanks, > > -- Petr Matousek / Red Hat Security Response Team
Powered by blists - more mailing lists
Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.