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Topic Title: AMD64 AntiVirus?
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Created On: 09/25/2004 06:17 PM
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 09/25/2004 06:17 PM
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quantum00
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Joined: 09/25/2004

Can someone explain what this is and how it works? I have yet to see anyone write a "how it works" on this. Toms hardware should have been all over it by now.
 09/25/2004 06:19 PM
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Ardrid
Heavy Wizardry

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Joined: 10/08/2003

It's not really AV per se. It prevents a specific type of attack known as a buffer overflow.

http://www.amd.com/us-en/Weble...32_1...4_11105,00.html' ">http://www.amd.com/us-en/Weble...32_11104_11105,00.html

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 09/27/2004 10:51 AM
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Greyhound
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Joined: 10/07/2003

What you call an 'AntiVirus' is a processor-feature called 'NX'(No execute), also known as 'Data Execution Prevention'(that's what Microsoft calls it) or 'Execute Disable' - AMD calls this 'Enhanced Virus Protection'(EVP).

In conjunction with Microsofts' Service Pack 2 for Windows XP, an Athlon 64/Athlon 64 FX/Opteron processor(they all support NX/EVP) can mark a certain part of the system memory(RAM) as 'non-executable' thus preventing any malicious code(e.g. a virus) from being run(=executed).

So like Ardrid pointed out, viruses of a certain type which exploit what is called a 'buffer-overflow' just won't 'work' on your system

More info here' ">http://www.microsoft.com/techn...maintain/sp2mempr.mspx

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