linux-kernel - Re: [PATCH v2 1/3] x86/mce: Avoid infinite loop for copy from user recovery

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Message-ID: <20210113161933.GE16960@zn.tnic>
Date:   Wed, 13 Jan 2021 17:19:33 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-edac <linux-edac@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH v2 1/3] x86/mce: Avoid infinite loop for copy from user
 recovery

On Wed, Jan 13, 2021 at 04:06:09PM +0000, Luck, Tony wrote:
> Maybe the other difference in approach between Andy and me is whether to
> go for a solution that covers all the corner cases, or just make an incremental
> improvement that allows for recover in some useful subset of remaining fatal
> cases, but still dies in other cases.

Does that mean more core code surgery?

> I'm happy to replace error messages with ones that are more descriptive and
> helpful to humans.

Yap, that: "Multiple copyin" with something more understandable to users...

Thx.

-- 
Regards/Gruss,
    Boris.

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