Linked by Thom Holwerda on Wed 3rd Jan 2018 00:42 UTC

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.

That's one hell of a bug.

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RE[3]: Overhyped
by le_c on Wed 3rd Jan 2018 07:23 UTC in reply to "RE[2]: Overhyped"
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Would it be possible to slow down page fault notifications? For example, if the page fault was not on kernel space, halt the application for the time offset of a kernel read. In this way all segfaults would be reported at the same time.

Are there any sane apps that depends on timely segfault handling and thus would be affected by such a workaround?

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