linux-kernel - Re: [PATCH v2 5/6] x86/cpu: Remove "noexec"

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Message-ID: <YgKrCZkiU3X2OV6b@google.com>
Date:   Tue, 8 Feb 2022 17:40:25 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Borislav Petkov <bp@...en8.de>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH v2 5/6] x86/cpu: Remove "noexec"

On Mon, Feb 07, 2022, Kees Cook wrote:
> On Thu, Jan 27, 2022 at 12:56:25PM +0100, Borislav Petkov wrote:
> > From: Borislav Petkov <bp@...e.de>
> > 
> > It doesn't make any sense to disable non-executable mappings -
> > security-wise or else.

Heh, I've actually used noexec relatively recently to triage KVM goofs.  That
said, the same net result can still be achieved via clearcpuid=52, so I've no
objection to removing the dedicated parameter.