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

Johannes Berg
2010-09-15T23:11:08Z

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.

johannes