linux-kernel - Re: [PATCH 1/6] x86/uaccess: Dont evaluate argument inside AC region

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Message-ID: <CALCETrWQpG2aOxxeoNXUPD-A7h3j4NSTqoN+vN9Nr2E_Fo19zg@mail.gmail.com>
Date:   Mon, 25 Feb 2019 07:43:53 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Julien Thierry <julien.thierry@....com>,
        Will Deacon <will.deacon@....com>,
        Ingo Molnar <mingo@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>, valentin.schneider@....com,
        Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] x86/uaccess: Dont evaluate argument inside AC region

On Mon, Feb 25, 2019 at 4:53 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> AC regions are special, make sure we don't do possibly complex
> evaluations there.
>
> Probably-Signed-off-by: Andy Lutomirski <luto@...nel.org>

I put a slightly fancier version here last night so that the 0day bot
could chew on it:

https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?h=x86/fixes&id=b294da548d92320f194172272dda1f734e51013d

want to snarf it up?  It's the same thing except that I added Linus'
suggested change, found the offending patch that broke it (hi Linus!)
and added a bit more changelog :)