linux-kernel - Re: [PATCH] Convert struct pid count to refcount

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Message-ID: <CAGXu5j+CFmdPQd_u6=C6ew0Y-j6ihUN7yN1GpJO6V=x2_Q6kRA@mail.gmail.com>
Date:   Thu, 28 Mar 2019 09:52:09 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Jann Horn <jannh@...gle.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        Oleg Nesterov <oleg@...hat.com>,
        "Reshetova, Elena" <elena.reshetova@...el.com>
Subject: Re: [PATCH] Convert struct pid count to refcount_t

On Thu, Mar 28, 2019 at 7:37 AM Joel Fernandes <joel@...lfernandes.org> wrote:
> Kees can you describe more the race you had in mind?

I just didn't see any barriers, so it seemed racey to me.

> Also note to the on looker, the original patch I sent is not wrong, that
> still applies and is correct. We are just discussing here any possible issues
> with the *existing* code.

Correct. And akpm has (correctly) taken this for -mm.

-- 
Kees Cook