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Message-ID: <20100930033009.GA32199@kroah.com>
Date: Wed, 29 Sep 2010 20:30:09 -0700
From: Greg KH <greg@...ah.com>
To: Joel Becker <Joel.Becker@...cle.com>,
oss-security <oss-security@...ts.openwall.com>
Subject: Re: Small exposure in ocfs2 fast symlinks.
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?
thanks,
greg k-h
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