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

From: Thilo Schulz (arny_at_ats.s.bawue.de)
Date: 11/21/03

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    To: bugtraq@securityfocus.com
Date: Fri, 21 Nov 2003 22:52:07 +0100

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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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