linux-kernel - KAISER, fun with the CPUs -- especially Intel. Cache effects can leak non-readable memory

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Message-ID: <20180104000152.GA29745@amd>
Date:   Thu, 4 Jan 2018 01:01:52 +0100
From:   Pavel Machek <pavel@....cz>
To:     kernel list <linux-kernel@...r.kernel.org>
Subject: KAISER, fun with the CPUs -- especially Intel. Cache effects can
 leak non-readable memory 

Hi!

I guess half of the lkml people already know, but others may have
noticed something funny/serious is going on with Intel CPUs in last
few days. And ... it is. Apparently you can read kernel memory from
userspace, abusing speculative execution on modern CPUs.

Issue was known for half a year now, and at least Intel, AMD and ARM
CPUs are affected.

https://googleprojectzero.blogspot.cz/2018/01/reading-privileged-memory-with-side.html

Grab popcorn, there is going to be a lot of fun, becuase these are CPU
bugs, not kernel bugs...

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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