MINIX: Intel's hidden in-chip operating system
Why? Let's start with what. Matthew Garrett, the well-known Linux and security developer who works for Google, explained recently that, "Intel chipsets for some years have included a Management Engine [ME], a small microprocessor that runs independently of the main CPU and operating system. Various pieces of software run on the ME, ranging from code to handle media DRM to an implementation of a TPM. AMT [Active Management Technology] is another piece of software running on the ME."
In May, we found out that AMT had a major security flaw, which had been in there for nine -- count 'em -- nine years.
"Fixing this requires a system firmware update in order to provide new ME firmware (including an updated copy of the AMT code)," Garrett wrote. "Many of the affected machines are no longer receiving firmware updates from their manufacturers, and so will probably never get a fix," he said. "Anyone who ever enables AMT on one of these devices will be vulnerable."
[...]
The Electronic Frontier Foundation (EFF) has called for Intel to provide a way for users to disable ME. Russian researchers have found a way to disable ME after the hardware has initialized, and the main processor has started. That doesn't really help much. ME is already running by then.
But Minnich found that what's going on within the chip is even more troubling. At a presentation at Embedded Linux Conference Europe, he reported that systems using Intel chips that have AMT, are running MINIX.
If you learned about operating systems in the late '80s and early '90s, you knew MINIX as Andrew S Tanenbaum's educational Unix-like operating system. It was used to teach operating system principles. Today, it's best known as the OS that inspired Linus Torvalds to create Linux.
So, what's it doing in Intel chips? A lot. These processors are running a closed-source variation of the open-source MINIX 3. We don't know exactly what version or how it's been modified since we don't have the source code.
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