Re: Huge Intel CPU Bug Allegedly Causes Kernel Memory Vulnerability With Up To 30% Performance Hit

[Pavel Alyev <aliech@aliech.ru>]

It's main reason why coreboot developers recommend to include LATEST 
microcode patch in build of BIOS image.

And if this can't be fixed... Nothing happened. There is many bugs in 
CPUs. And kernel have workarounds for this. Look on non x86 sources. 
Look on huge errata's lists of ARM, for example. It's normal practice.


03.01.2018 13:43, Vincent Deffontaines пишет:
> Greetings,
>
> And happy new year.
>
> This is hitting all of us soon.
> In short : a huge (and long lasting) hardware bug, present in about 
> all Intel CPUs that have been sold for the last 10 years.
> It is not fixable by microcode, and requires ugly patching from the 
> kernel layer. Other OSes such as Microsoft are concerned as well.
>
> Nice overview of the thing :
> https://hothardware.com/news/intel-cpu-bug-kernel-memory-isolation-linux-windows-macos 
>
>
> More detail :
> http://pythonsweetness.tumblr.com/post/169166980422/the-mysterious-case-of-the-linux-page-table 
>
>
> Linus' patch :
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5aa90a84589282b87666f92b6c3c917c8080a9bf 
>
>
>
> Vincent Deffontaines

--
With best regards