linux-kernel - Re: [PATCH] x86/msr: Block writes to certain MSRs unconditionally

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Message-ID: <20210412093728.GA24283@zn.tnic>
Date:   Mon, 12 Apr 2021 11:37:28 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Feng Tang <feng.tang@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Zhang, Rui" <rui.zhang@...el.com>,
        "Kleen, Andi" <andi.kleen@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Len Brown <len.brown@...el.com>
Subject: Re: [PATCH] x86/msr: Block writes to certain MSRs unconditionally

On Sun, Apr 11, 2021 at 04:21:21PM -0700, Andy Lutomirski wrote:
> https://bugs.winehq.org/show_bug.cgi?id=33275#c19
> 
> I sure hope no one is still doing this.

Aha, IRET with rFLAGS.NT set. At least it is only an ad-hoc program to
fix this particular issue and I hope too it hasn't propagated somewhere
else.

Thx.

-- 
Regards/Gruss,
    Boris.

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