Re: [RFC PATCH] x86: Filter MSR writes from luserspace

[Ingo Molnar]

* Borislav Petkov <bp@xxxxxxxxx> wrote:

> On Tue, Nov 26, 2019 at 12:50:28PM -0800, Andi Kleen wrote:
> > You'll almost certainly violate Linus' golden rule of application
> > compatibility and the whole thing will be reverted in the end.

This objection is bogus, the ABI isn't broken, since this is basically a 
tweak of the default security model, by pushing questionable MSR 
modifications to a module or boot parameter. Those who know what they are 
doing can still do it.

The goal would be to make sure via a whitelist that end user distros 
won't have to set this parameter to permissive again, of course.

Thanks,

	Ingo