Google: How to make any AMD Zen CPU always generate 4 as a random number

stapp · Feb 5, 2025

Googlers have not only figured out how to break AMD's security – allowing them to load unofficial microcode into its processors to modify the silicon's behavior as they wish – but also demonstrated this by producing a microcode patch that makes the chips always output 4 when asked for a random number.

And this ability to change the microcode not only allows Google and others to customize the operation of their AMD chips, for good and non-good reasons, but it also smashes the Epyc maker's secure encrypted virtualization and root-of-trust security features.
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https://www.theregister.com/2025/02/04/google_amd_microcode/

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Google: How to make any AMD Zen CPU always generate 4 as a random number

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