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From: Aleksa Sarai <cyphar@cyphar.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Christian Brauner <christian@brauner.io>,
	jannh@google.com, viro@zeniv.linux.org.uk,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
	arnd@arndb.de, akpm@linux-foundation.org, dhowells@redhat.com,
	ebiederm@xmission.com, elena.reshetova@intel.com,
	keescook@chromium.org, luto@amacapital.net, luto@kernel.org,
	tglx@linutronix.de, linux-alpha@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
	linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org,
	linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-s390@vger.kernel.org, linux-sh@vger.kernel.org,
	sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org,
	linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-kselftest@vger.kernel.org, joel@joelfernandes.org,
	dancol@google.com, serge@hallyn.com,
	Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: [PATCH v1 1/2] pid: add pidfd_open()
Date: Fri, 17 May 2019 00:56:07 +1000
Message-ID: <20190516145607.j43xyj26k6l5vmbd@yavin> (raw)
In-Reply-To: <20190516142659.GB22564@redhat.com>

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On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> On 05/16, Christian Brauner wrote:
> >
> > With the introduction of pidfds through CLONE_PIDFD it is possible to
> > created pidfds at process creation time.
> 
> Now I am wondering why do we need CLONE_PIDFD, you can just do
> 
> 	pid = fork();
> 	pidfd_open(pid);

While the race window would be exceptionally short, there is the
possibility that the child will die and their pid will be recycled
before you do pidfd_open(). CLONE_PIDFD removes the race completely.

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

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  reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-16 13:59 Christian Brauner
2019-05-16 13:59 ` [PATCH v1 2/2] tests: add pidfd_open() tests Christian Brauner
2019-05-16 14:27 ` [PATCH v1 1/2] pid: add pidfd_open() Oleg Nesterov
2019-05-16 14:56   ` Aleksa Sarai [this message]
2019-05-16 15:06     ` Oleg Nesterov
2019-05-16 15:12       ` Aleksa Sarai
2019-05-16 15:22         ` Oleg Nesterov
2019-05-16 15:29           ` Christian Brauner
2019-05-16 14:57   ` Christian Brauner
2019-05-16 14:56 ` Geert Uytterhoeven
2019-05-16 14:58   ` Christian Brauner

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