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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