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

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Message-ID: <20100827215316.GA32405@bougret.hpl.hp.com>
Date:	Fri, 27 Aug 2010 14:53:16 -0700
From:	Jean Tourrilhes <jt@....hp.com>
To:	Kees Cook <kees.cook@...onical.com>
Cc:	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 02:43:57PM -0700, Kees Cook wrote:
> Hi Jean,
> 
> The comment should probably be clarified -- it's the caller's iwp->length
> that may be causing problems

	Ha ! I see. It would be for regular iwpoint queries, not for
extended NOMAX queries (scan is a extended NOMAX query).
	Note that I don't like the idea of reducing the mallocated
size, especially with regular queries, as I know that some driver may
expect a fixed size in extra and may memcpy to it without double
checking.

> Regardless, the above patch would appear to limit the copy_to_user
> to only the kzalloced region.

	I'm glad you like it.

> Thanks!
> 
> -Kees

	Regards,

	Jean
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