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

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Message-ID: <20100827223926.GB32498@bougret.hpl.hp.com>
Date:	Fri, 27 Aug 2010 15:39:26 -0700
From:	Jean Tourrilhes <jt@....hp.com>
To:	"Luis R. Rodriguez" <mcgrof@...il.com>
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>,
	Johannes Berg <johannes@...solutions.net>,
	Joe Perches <joe@...ches.com>, Tejun Heo <tj@...nel.org>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] wireless: fix 64K kernel heap content leak via ioctl

On Fri, Aug 27, 2010 at 03:35:19PM -0700, Luis R. Rodriguez wrote:
> >
> > diff -u -p wext.j2.c wext.c
> > --- wext.j2.c   2010-08-27 14:17:26.000000000 -0700
> > +++ wext.c      2010-08-27 14:19:33.000000000 -0700
> > @@ -800,9 +800,12 @@ static int ioctl_standard_iw_point(struc
> >                        goto out;
> >                }
> >
> > -               if (copy_to_user(iwp->pointer, extra,
> > -                                iwp->length *
> > -                                descr->token_size)) {
> > +               /* Verify how much we should return. Some driver
> > +                * may abuse iwp->length... */
> > +               if((iwp->length * descr->token_size) < extra_size)
> > +                       extra_size = iwp->length * descr->token_size;
> > +
> > +               if (copy_to_user(iwp->pointer, extra, extra_size)) {
> >                        err = -EFAULT;
> >                        goto out;
> >                }
> 
> 
> Jean, can you submit in a new thread and right before the SOB add in
> the commit log Cc: stable@...nel.org [2.6.32+]

	The current patch was made for 2.6.27 and was only
compiled. Someone would need to verify it works for 2.6.32. I could
probably find some time next week.

>   Luis

	Regards,

	Jean
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