Intel KPTI flaw
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The Intel kernel page-table isolation flaw (Intel KPTI flaw) is a CPU bug found in a large complement of Intel CPUs and first reported on 3 January 2018 by The Register. The bug consists of a hardware security flaw that "can exploit security weaknesses and access security keys, passwords, and files cached from a disk".[1] Microsoft, Apple and Linux developers have moved to patch supported operating systems to workaround the flaw that cannot be fixed in microcode. The Linux fix is kernel page-table isolation (KPTI). In some cases, the fixes would make the computers equipped with those CPUs 30% slower.
AMD CPUs are not affected, according to Tom Lendacky.[2][3][4]
See also
- Row hammer – an unintended side effect in dynamic random-access memory causing memory cells to interact electrically
- Pentium FDIV bug
- Pentium F00F bug
References
- ^ "Intel's processors have a security bug and the fix could slow down PCs". The Verge. Retrieved 2018-01-03.
- ^ "LKML: Tom Lendacky: [PATCH] x86/cpu, x86/pti: Do not enable PTI on AMD processors". lkml.org. Retrieved 2018-01-03.
- ^ "The mysterious case of the Linux Page Table Isolation patches". python sweetness. Retrieved 2018-01-03.
- ^ "Linux Gaming Performance Doesn't Appear Affected By The x86 PTI Work - Phoronix". www.phoronix.com. Retrieved 2018-01-03.
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