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Kernel-memory-leaking Intel processor design flaw forces Linux, Windows redesign | Pe

Submitted by: SINep @ 08:23 PM | Wednesday, January 3, 2018 | (url: https://www.there...)

A fundamental design flaw in Intel's processor chips has forced a significant redesign of the Linux and Windows kernels to defang the chip-level security bug.

Programmers are scrambling to overhaul the open-source Linux kernel's virtual memory system. Meanwhile, Microsoft is expected to publicly introduce the necessary changes to its Windows operating system in an upcoming Patch Tuesday: these changes were seeded to beta testers running fast-ring Windows Insider builds in November and December.

Crucially, these updates to both Linux and Windows will incur a performance hit on Intel products. The effects are still being benchmarked, however we're looking at a ballpark figure of five to 30 per cent slow down, depending on the task and the processor model. More recent Intel chips have features such as PCID to reduce the performance hit. Your mileage may vary.

Best case: 17% slowdown
Worst case: 23% slowdown
The Register (@TheRegister) January 2, 2018

Similar operating systems, such as Apple's 64-bit macOS, will also need to be updated the flaw is in the Intel x86-64 hardware, and it appears a microcode update can't address it. It has to be fixed in software at the OS level, or go buy a new processor without the design blunder.

Details of the vulnerability within Intel's silicon are under wraps: an embargo on the specifics is due to lift early this month, perhaps in time for Microsoft's Patch Tuesday next week. Indeed, patches for the Linux kernel are available for all to see but comments in the source code have been redacted to obfuscate the issue.

However, some details of the flaw have surfaced, and so this is what we know.


More:
https://www.theregister.co.uk/2018/01/02/intel_cpu_design_flaw/