From: Andi Kleen <ak@linux.intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: x86-ml <x86@kernel.org>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH] x86: Filter MSR writes from luserspace
Date: Tue, 26 Nov 2019 12:50:28 -0800 [thread overview]
Message-ID: <20191126205028.GJ84886@tassilo.jf.intel.com> (raw)
In-Reply-To: <20191126203336.GF31379@zn.tnic>
On Tue, Nov 26, 2019 at 09:33:36PM +0100, Borislav Petkov wrote:
> On Tue, Nov 26, 2019 at 12:15:10PM -0800, Andi Kleen wrote:
> > This will break a bazillion of tools that rely on programing many of
> > those MSRs from user space.
>
> Userspace has no deal to poke into random MSRs. End of story.
You'll almost certainly violate Linus' golden rule of application
compatibility and the whole thing will be reverted in the end.
-Andi
next prev parent reply other threads:[~2019-11-26 20:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-26 11:22 [RFC PATCH] x86: Filter MSR writes from luserspace Borislav Petkov
2019-11-26 11:36 ` Borislav Petkov
2019-11-26 20:15 ` Andi Kleen
2019-11-26 20:33 ` Borislav Petkov
2019-11-26 20:50 ` Andi Kleen [this message]
2019-11-26 20:53 ` Borislav Petkov
2019-11-27 7:08 ` Ingo Molnar
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