linux-kernel - Re: [PATCH] Revert "exec: make de_thread() freezable (was: Re: Linux 4.20-rc4)

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Message-ID: <20181205143618.GA9535@redhat.com>
Date:   Wed, 5 Dec 2018 15:36:19 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Chanho Min <chanho.min@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Pavel Machek <pavel@....cz>, Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] Revert "exec: make de_thread() freezable (was: Re: Linux
 4.20-rc4)

Ingo, et al,

Sorry, I am sick and can't participate this discussion right now,

On 12/04, Ingo Molnar wrote:
>
> * Oleg Nesterov <oleg@...hat.com> wrote:
>
> > we really need to narrow the (huge) scope of ->cred_guard_mutex in exec paths.
> >
> > my attempt to fix this was nacked, and nobody suggested a better solution so far.
>
> Any link to your patch and the NAK?

See https://lore.kernel.org/lkml/20170213141452.GA30203@redhat.com/

No questions, the patch wasn't pretty. And imo we need to rework the security
hooks in the long term.

Oleg.