linux-kernel - Re: objtool clac/stac handling change..

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Message-ID: <CAHk-=wh-qbjVo5-cQCAjEbQ0ykN+x6CXpNqYHqaj8kikhnWHpA@mail.gmail.com>
Date:   Thu, 2 Jul 2020 20:32:21 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@....fr>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: objtool clac/stac handling change..

On Thu, Jul 2, 2020 at 6:33 PM Al Viro <viro@...iv.linux.org.uk> wrote:
>
> What about load_unaligned_zeropad()?

What about it? It doesn't care. It's for kernel addresses, clearing AC
on exception does nothing.

There's no user_access_begin/end anywhere around that thing that I can see.

             Linus