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MELTDOWN SPECTRE Architecture Intel Intel, ARM, AMD Entry Must have code execution on the system Must have code execution on the system Intel Privilege Escalation + Speculative Execution Branch prediction + Speculative Execution Method Impact Read kernel memory from user space Read contents of memory from other users' running programs Software patching more nuanced) Action Software patching Daniel Miessler 2018

Meltdown and Spectre CPU architecture affected


Uploaded by bagofgnutea Jan 05, 2018 at 05:12AM EST

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Origin Entry: Meltdown and Spectre

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From Date Subject Re: Avoid speculative indirect calls in kernel Linus Torvalds <> Wed, 3 Jan 2018 15:51:35-0800 On Wed, Jan 3, 2018 at 3:09 PM, Andi Kleen <andi@firstfloor.org wrote: > This is a fix for Variant 2 in ading-pr ed-memor ide > Any speculative indirect calls in the kernel can be tricked to execute any kernel code, which may allow side channel » attacks that can leak arbitrary kernel data Why is this all done without any configuration options? A *competent* CPU engineer would fix this by making sure speculation doesn't happen across protection domains. Maybe even a L1 I$ that is keyed by CPL. I think somebody inside of Intel needs to really take a long hard look at their CPU's, and actually admit that they have issues instead of writing PR blurbs that say that everything works as designed .. and that really means that all these mitigation patches should be written with "not all CPU's are crap" in mind Or is Intel basically saying "we are committed to selling you s--- forever and ever, and never fixing anything"? Because if that's the case, maybe we should start looking towards the ARM64 people more Please talk to management. Because I really see exactly two possibibilities: Intel never intends to fix anything OR - these workarounds should have a way to disable them. Which of the two is it? Linus Last update: 2018-01-04 00:53 [W:0.021 /U:1.412 seconds] ©2003-2017 Jasper Spaans. hosted at Digital Ocean idvertise on this site
Anonymous 01/03/18(Wed)20:34:33 No.64127406▶>>64127456 64128023 64128103 64128335 64130566 264130804 264131061 Intel f----- up with security Security patch was released Security patch massively downgrades performance Security patch affects all syscalls nGreddia GPUs heavily rely on syscalls because they don't have their own integrated pipeline to do this, while Radeon has it since GCN 1.1 and up Basically all noVideo GayPoos will have performance downgrade alongside with Intel CPUs if theyll be combo'ed on patched systems There will be no performance downgrade only if GayForce will be paired with Zen CPUs Performance downgrade is anywhere from 30% to 61%. Yes. Really Intel just now cancelled future gen of CPUs Brian Krzhanich sold a lot of stock and ran away before Intel's shares started falling hard
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Uploaded Jan 05, 2018 at 05:12AM EST

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Meltdown and Spectre

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meltdown, spectre, intel, amd, arm, security, hardware

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