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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed, 1 Apr 2020 13:55:11 -0700
Message-ID: <CAHk-=wihrtjjSsF6mGc7wjrtVQ-pha9ZAeo1rQAeuO1hr+i1qw@mail.gmail.com>
Subject: Re: [PATCH] signal: Extend exec_id to 64bits
To:     "Eric W. Biederman" <ebiederm@xmission.com>
Cc:     Adam Zabrocki <pi3@pi3.com.pl>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Kernel Hardening <kernel-hardening@lists.openwall.com>,
        Jann Horn <jannh@google.com>, Oleg Nesterov <oleg@redhat.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Bernd Edlinger <bernd.edlinger@hotmail.de>,
        Kees Cook <keescook@chromium.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        stable <stable@vger.kernel.org>
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On Wed, Apr 1, 2020 at 1:50 PM Eric W. Biederman <ebiederm@xmission.com> wrote:
>
> I have updated the update of exec_id on exec to use WRITE_ONCE
> and the read of exec_id in do_notify_parent to use READ_ONCE
> to make it clear that there is no locking between these two
> locations.

Ack, makes sense to me.

Just put it in your branch, this doesn't look urgent, considering that
it's something that has been around forever.

            Linus