linux-kernel - Re: [PATCH] wireless extensions: fix kernel heap content leak

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Message-ID: <20100830180302.GM4703@outflux.net>
Date:	Mon, 30 Aug 2010 11:03:03 -0700
From:	Kees Cook <kees.cook@...onical.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	"John W. Linville" <linville@...driver.com>,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Joe Perches <joe@...ches.com>, Tejun Heo <tj@...nel.org>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	Jean Tourrilhes <jt@....hp.com>
Subject: Re: [PATCH] wireless extensions: fix kernel heap content leak

Hi Johannes,

On Mon, Aug 30, 2010 at 12:24:54PM +0200, Johannes Berg wrote:
> --- wireless-testing.orig/net/wireless/wext-compat.c	2010-08-30 12:04:57.000000000 +0200
> +++ wireless-testing/net/wireless/wext-compat.c	2010-08-30 12:11:32.000000000 +0200
> @@ -1420,6 +1420,9 @@ int cfg80211_wext_giwessid(struct net_de
>  {
>  	struct wireless_dev *wdev = dev->ieee80211_ptr;
>  
> +	data->flags = 0;
> +	data->length = 0;
> +
>  	switch (wdev->iftype) {
>  	case NL80211_IFTYPE_ADHOC:
>  		return cfg80211_ibss_wext_giwessid(dev, info, data, ssid);

Thanks for all your work on this! Were you able to trigger the leak
through cfg80211? If so, then this will need a CVE assigned and sent to
stable too, I think.

-Kees

-- 
Kees Cook
Ubuntu Security Team
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