linux-kernel - Re: RFC: on adding new CLONE_* flags [WAS Re: [PATCH 0/4] clone: add CLONE

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Message-ID: <20190430123901.GD23020@redhat.com>
Date:   Tue, 30 Apr 2019 14:39:01 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Jann Horn <jannh@...gle.com>, Kevin Easton <kevin@...rana.org>,
        Andy Lutomirski <luto@...nel.org>,
        Christian Brauner <christian@...uner.io>,
        Aleksa Sarai <cyphar@...har.com>,
        "Enrico Weigelt, metux IT consult" <lkml@...ux.net>,
        Al Viro <viro@...iv.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        Linux API <linux-api@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Arnd Bergmann <arnd@...db.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Daniel Colascione <dancol@...gle.com>
Subject: Re: RFC: on adding new CLONE_* flags [WAS Re: [PATCH 0/4] clone: add
 CLONE_PIDFD]

On 04/29, Linus Torvalds wrote:
>
> Linux vfork() is very much a real vfork(). What do you mean?

Yes, but I am wondering if man vfork should clarify what "child terminates"
actually means. I mean, the child can do clone(CLONE_THREAD) + sys_exit(),
this will wake the parent thread up before the child process exits or execs.

I see nothing wrong, but I was always curious whether it was designed this
way on purpose or not.

Oleg.