bugtraq - Re: [aadams@...urityfocus.com: Linux Kernel <= 2.4.21 MXCSR Local DOS Exploitation]

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Date: Fri, 21 Nov 2003 22:52:07 +0100
From: Thilo Schulz <arny@....s.bawue.de>
To: bugtraq@...urityfocus.com
Subject: Re: [aadams@...urityfocus.com: Linux Kernel <= 2.4.21 MXCSR Local DOS Exploitation]


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On Friday 21 November 2003 01:10, David Ahmad wrote:
> Starting with the P3, Intel processors included SSE support which amongst
> many other things added the MXCSR register to handle SSE status and
> control information (and various behavioral flags). MXCSR is a 32-bit
> register, the MSB 16-bits of which are reserved. Intel specifies that if
> these reserved bits are written to a general protection fault (#GP) will
> occur.

An interesting question is: does this problem apply to AMD Processors as well 
if /proc/cpuinfo has sse included in the cpuflags?
Anyone able to clear this issue up?

- -- 
 - Thilo Schulz

My public GnuPG key is available at http://home.bawue.de/~arny/public_key.asc
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