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Supply code for Alder Lake BIOS was posted to GitHub

by vybmedia1
October 9, 2022
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In a nutshell: Obvious supply code for Alder Lake BIOS has been shared on-line. It appears to have been leaked in its entirety at 5.9 GB uncompressed, probably by somebody working at a motherboard vendor, or unintentionally by a Lenovo manufacturing companion.

Some Twitter customers appear to suppose that the code originated from 4chan. It made its approach onto GitHub yesterday and earlier than it was taken down earlier this morning, somebody peered into its supply logs and located that the preliminary commit was dated September 30 and authored by an worker of LC Future Middle, a Chinese language firm that probably manufactures Lenovo laptops. The code is now accessible from a number of mirrors and is being shared and talked about all around the Web.

It may take days earlier than somebody analyzes all 5.9 GB however some attention-grabbing sections have already been found. There are apparently a number of references to a “Lenovo Function Tag Take a look at” that additional hyperlink the leak to the OEM. Different sections allegedly title AMD CPUs, suggesting the code has been altered since leaving Intel. Most alarmingly, a researcher has discovered express references to undocumented MSRs, which may pose a major safety danger.

I can not consider: NDA-ed MSRs, for the most recent CPU, what a great day… pic.twitter.com/bNitVJlkkL

— Mark Ermolov (@_markel___) October 8, 2022

MSRs (mannequin particular registers) are particular registers that solely privileged code just like the BIOS or working system can entry. Distributors use them for toggling choices throughout the CPU, like enabling particular modes for debugging or efficiency monitoring, or options reminiscent of sure varieties of directions.

CPUs can have lots of of MSRs, and Intel and AMD solely publish the documentation for half to two-thirds of them. The undocumented MSRs are sometimes linked to choices that CPU producer desires to maintain secret. For instance, an undocumented MSR contained in the AMD K8 CPU was found by researchers to allow a privileged debugging mode. MSRs additionally play an vital half in safety. Intel and AMD each used MSR choices to patch the Spectre vulnerabilities of their CPUs that predated {hardware} mitigation.

Safety researchers have proven that it is doable to create new assault vectors in fashionable CPUs by manipulating undocumented MSRs. The situation during which that may be doable may be very complicated and never essentially what’s unfolding proper now, nevertheless it stays a chance. It is as much as Intel to make clear the scenario and the dangers posed to their clients.





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