netdev - Re: [vendor-sec] [PATCH] wireless: fix 64K kernel heap content leak via ioctl

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Date:	Wed, 15 Sep 2010 16:28:04 -0700
From:	Greg KH <greg@...ah.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Kees Cook <kees.cook@...onical.com>, linux-kernel@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Joe Perches <joe@...ches.com>, Jean Tourrilhes <jt@....hp.com>,
	Tejun Heo <tj@...nel.org>, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [vendor-sec] [PATCH] wireless: fix 64K kernel heap content
 leak via ioctl

On Thu, Sep 16, 2010 at 01:11:07AM +0200, Johannes Berg wrote:
> On Wed, 2010-09-15 at 15:48 -0700, Greg KH wrote:
> > On Fri, Aug 27, 2010 at 02:02:41PM -0700, Kees Cook wrote:
> > > This problem was originally tracked down by Brad Spengler.
> > > 
> > > When calling wireless ioctls, if a driver does not correctly
> > > validate/shrink iwp->length, the resulting copy_to_user can leak up to
> > > 64K of kernel heap contents.
> > > 
> > > It seems that this is triggerable[1] in 2.6.32 at least on ath5k, but
> > > I was not able to track down how. The twisty maze of ioctl handlers
> > > stumped me. :) Other drivers I checked did not appear to have any problems,
> > > but the potential remains. I'm not sure if this patch is the right approach;
> > > it was fixed differently[2] in grsecurity.
> > > 
> > > [1] http://forums.grsecurity.net/viewtopic.php?f=3&t=2290&start=0
> > > [2] http://grsecurity.net/~spender/wireless-infoleak-fix2.patch
> > 
> > Is this fixed differently upstream in the kernel with commit id
> > 42da2f948d949efd0111309f5827bf0298bcc9a4?
> 
> Yes, that's the fix for this.

Wonderful, thanks for letting me know.

greg k-h
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