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Message-ID: <20100930054949.GA9118@mail.oracle.com>
Date: Wed, 29 Sep 2010 22:49:50 -0700
From: Joel Becker <Joel.Becker@...cle.com>
To: Greg KH <greg@...ah.com>
Cc: oss-security <oss-security@...ts.openwall.com>
Subject: Re: Small exposure in ocfs2 fast symlinks.
On Wed, Sep 29, 2010 at 08:30:09PM -0700, Greg KH wrote:
> On Wed, Sep 29, 2010 at 07:04:07PM -0700, Joel Becker wrote:
> > Hey Everyone,
> > We just discovered that ocfs2 could walk off the end of fast
> > symlinks -- that is, symlinks that are stored directly in the inode
> > block. ocfs2 terminates these with NUL characters, but a disk
> > corruption or an attacker with direct access to the ocfs2 disk could
> > overwrite the NUL. Following the symlink via the filesystem would walk
> > off the end of the in-memory block buffer. We're not sure how
> > exploitable this is, but I figured I'd provide a heads-up. The fix is
> > in ocfs2's git tree and will be sent upstream tonight. Erratas with the
> > fix are being built.
>
> Care to send the git commit id to the stable@...nel.org tree when it
> hits Linus's tree so it gets backported there?
I Cc'd stable@...nel.org in the commit, don't worry ;-)
Joel
--
Life's Little Instruction Book #267
"Lie on your back and look at the stars."
Joel Becker
Consulting Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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