linux-kernel - Re: [PATCH 06/11] x86/fault: Improve kernel-executing-user-memory handling

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Message-ID: <20210203160117.GF13819@zn.tnic>
Date:   Wed, 3 Feb 2021 17:01:17 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Christoph Hellwig <hch@...radead.org>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yonghong Song <yhs@...com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 06/11] x86/fault: Improve kernel-executing-user-memory
 handling

On Mon, Feb 01, 2021 at 05:00:37PM -0800, Andy Lutomirski wrote:
> I defer to Boris as to exactly what condition we should check here.

Same as for erratum #91:

https://lkml.kernel.org/r/20210201203146.GC14590@zn.tnic

A single helper containing that check is probably a good idea.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette