linux-kernel - Re: [PATCH 14/24] x86: Restrict MSR access when the kernel is locked down

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Date:   Fri, 14 Apr 2017 20:30:33 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     David Howells <dhowells@...hat.com>
cc:     linux-kernel@...r.kernel.org, matthew.garrett@...ula.com,
        linux-efi@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        gnomes@...rguk.ukuu.org.uk, gregkh@...uxfoundation.org,
        x86@...nel.org, linux-security-module@...r.kernel.org,
        keyrings@...r.kernel.org
Subject: Re: [PATCH 14/24] x86: Restrict MSR access when the kernel is locked
 down

On Wed, 5 Apr 2017, David Howells wrote:

Can you please change the subsys in $subject to 'x86/msr:' ?

> From: Matthew Garrett <matthew.garrett@...ula.com>
> 
> Writing to MSRs should not be allowed if the kernel is locked down, since
> it could lead to execution of arbitrary code in kernel mode.  Based on a
> patch by Kees Cook.
> 
> Signed-off-by: Matthew Garrett <matthew.garrett@...ula.com>
> Signed-off-by: David Howells <dhowells@...hat.com>
> Acked-by: Kees Cook <keescook@...omium.org>
> cc: x86@...nel.org

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>