Submission + - How to make any AMD Zen CPU always generate 4 as a random number (theregister.com)
headlessbrick writes: Google researchers have discovered a way to bypass AMD's security, enabling them to load unofficial microcode into its processors and modify the silicon’s behaviour at will. To demonstrate this, they created a microcode patch that forces the chips to always return 4 when asked for a random number.
Beyond simply allowing Google and others to customize AMD chips for both beneficial and potentially malicious purposes, this capability also undermines AMD’s secure encrypted virtualization and root-of-trust security mechanisms.
Beyond simply allowing Google and others to customize AMD chips for both beneficial and potentially malicious purposes, this capability also undermines AMD’s secure encrypted virtualization and root-of-trust security mechanisms.
