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

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Message-ID: <AANLkTinZmG-bv_m0ktL+NBbtMRtHkM+urfD9M1GdLxCD@mail.gmail.com>
Date:	Fri, 27 Aug 2010 15:51:47 -0700
From:	"Luis R. Rodriguez" <mcgrof@...il.com>
To:	jt@....hp.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 3:39 PM, Jean Tourrilhes <jt@....hp.com> wrote:
> 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.

Got it, ah so it would be Cc: stable@...nel.org [2.6.27+]. To get this
trickled in we first need it for wireless-testing.git, and provide
links / patches to the backport of the patch for each kernel. Once it
gets merged into Linus' tree the stable team can apply the respective
backported patches.

  Luis
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