oss-security - CVE-2010-0727 kernel: gfs/gfs2 locking code DoS flaw

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Date: Fri, 12 Mar 2010 13:17:55 +0800
From: Eugene Teo <eugeneteo@...nel.sg>
To: oss-security@...ts.openwall.com
CC: coley@...us.mitre.org
Subject: CVE-2010-0727 kernel: gfs/gfs2 locking code DoS flaw

static int
gfs_lock(struct file *file, int cmd, struct file_lock *fl)
{
..
         if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
                 return -ENOLCK;
..
}

This is a check for mandatory locking where the GFS/GFS2 locking code 
will skip the lock in case sgid bits are set for the file. This can be 
triggered to cause a crash on a system mounting a GFS/GFS2 filesystem.

I believe only GFS2 is part of the upstream kernel, and GFS only affects 
Red Hat Enterprise Linux.

https://bugzilla.redhat.com/CVE-2010-0727
http://lkml.org/lkml/2010/3/11/269

Thanks, Eugene

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