linux-kernel - Re: Using x86 segments against NULL pointer deference exploit

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Message-ID: <4AF7B715.7080205@zytor.com>
Date:	Sun, 08 Nov 2009 22:30:45 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	matthieu castet <castet.matthieu@...e.fr>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: Using x86 segments against NULL pointer deference exploit

On 11/06/2009 12:35 PM, matthieu castet wrote:
> 
> May be the sane way should be to forbid mapping page 0, and make run
> application needing page 0 in a
> emulator. After all it is for special case [1] :
> - Win16 binary for wine
> - upstream version of dosemu and qemu have workaround
> 
> But some distro still set mmap_min_addr to 0 (ubuntu+wine, ...) :(
> 

Don't Do That, Then[TM].

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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