linux-kernel - Re: [Oops 1/2]Something wrong with copy_from

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Message-ID: <alpine.LNX.2.00.1104302311530.12035@pobox.suse.cz>
Date:	Sat, 30 Apr 2011 23:13:10 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Harry Wei <jiaweiwei.xiyou@...il.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	greg@...ah.com, joe@...ches.com, randy.dunlap@...cle.com
Subject: Re: [Oops 1/2]Something wrong with copy_from_user() function

On Sat, 30 Apr 2011, Harry Wei wrote:

> Hi us,
> 	When i was compiling 2.6.38.2 kernel. Something wrong happend to me.
> It shows like following.
> 
> [...]
> Warning: call to 'copy_from_user_overflow' declared with attribute warning:
> copy_from_user buffer size is not provably correct.
> [...]
> 
> See http://s1202.photobucket.com/albums/bb364/harrywei/Kernel/?action=view&current=report_bug.png for details.
> 	I tried to fix this warning, but i don't know how to deal with
> it. Can anyone help me.

wpa_set_keys() function (from staging drivers) in your kernel uses 
copy_from_user() without proper bounds checking, and thus can overflow and 
corrupt memory.

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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