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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