diTii.com Digital News Hub

Sign up with your email address to be the first to know about latest news and more.

I agree to have my personal information transfered to MailChimp (more information)

Nov152010

‘Super-secret’ Password-protected Debugger Discovered in AMD Processors

A hardware hacker has discovered a secret debugging feature hidden in all AMD chips made in the past decade. “The password-protected debugger came as a shock to reverse-engineers who’ve hungered for an on-chip mechanism for performing conditional and direct-hardware breakpoint operations. Although AMD has built the firmware-controlled feature into all chips since the Athlon XP, the company kept it a closely guarded secret that was only disclosed by a hacker who goes by the name Czernobyl.”

“AMD processors (Athlon XP and better) have included firmware-based debugging features that expand greatly over standard, architecturally defined capabilities of x86,” the hacker wrote. “For some reason, though, AMD has been tightly secretive about these features; hint of their existence was gained by glancing at CBID’s page.”

To put a chip into developer mode, a user must first enter what amounts to a password — 9C5A203A — into the CPU’s EDI register. Czernobyl was able to deduce the secret setting by brute forcing the key.

[Source]

Share This Story, Choose Your Platform!

Get Latest News

Subscribe to Digital News Hub

Get our daily newsletter about the latest news in the industry.
First Name
Last Name
Email address
Secure and Spam free...