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From: ebiederm@xmission.com (Eric W. Biederman)
To: Christian Brauner <christian.brauner@canonical.com>
Cc: Daniel Colascione <dancol@google.com>,
	Joel Fernandes <joelaf@google.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Tim Murray <timmurray@google.com>,
	Suren Baghdasaryan <surenb@google.com>
Subject: Re: [RFC PATCH] Implement /proc/pid/kill
Date: Wed, 31 Oct 2018 00:00:51 -0500	[thread overview]
Message-ID: <87h8h21zi4.fsf@xmission.com> (raw)
In-Reply-To: <CAPP7u0X-FRgS0kGcL7dMEGzLys54UkXU3+drX76=NmMbCOLsxg@mail.gmail.com> (Christian Brauner's message of "Tue, 30 Oct 2018 12:19:51 +0100")

Christian Brauner <christian.brauner@canonical.com> writes:

> On Tue, Oct 30, 2018 at 12:12 PM Daniel Colascione <dancol@google.com> wrote:
>>
>> On Tue, Oct 30, 2018 at 11:04 AM, Christian Brauner
>> <christian.brauner@canonical.com> wrote:
>> > On Tue, Oct 30, 2018 at 11:48 AM Daniel Colascione <dancol@google.com> wrote:
>> >>
>> >> Why not?
>> >>
>> >> Does your proposed API allow for a race-free pkill, with arbitrary
>> >> selection criteria? This capability is a good litmus test for fixing
>> >> the long-standing Unix process API issues.
>> >
>> > You'd have a handle on the process with an fd so yes, it would be.
>>
>> Thanks. That's good to hear.
>>
>> Any idea on the timetable for this proposal? I'm open to lots of
>> alternative technical approaches, but I don't want this capability to
>> languish for a long time.
>
> Latest end of year likely sooner depending on the feedback I'm getting
> during LPC.

Frankly.  If you want a race free fork variant probably the easiest
thing to do is to return a open copy of the proc directory entry.  Wrapped
in a bind mount so that you can't see beyond that directory in proc.

My only concern would be if a vfsmount per process would be too heavy for such a use.

Eric




  reply	other threads:[~2018-10-31  5:01 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-29 22:10 [RFC PATCH] Implement /proc/pid/kill Daniel Colascione
2018-10-30  3:21 ` Joel Fernandes
2018-10-30  8:50   ` Daniel Colascione
2018-10-30 10:39     ` Christian Brauner
2018-10-30 10:40       ` Christian Brauner
2018-10-30 10:48         ` Daniel Colascione
2018-10-30 11:04           ` Christian Brauner
2018-10-30 11:12             ` Daniel Colascione
2018-10-30 11:19               ` Christian Brauner
2018-10-31  5:00                 ` Eric W. Biederman [this message]
2018-10-30 17:01     ` Joel Fernandes
2018-10-30  5:00 ` Aleksa Sarai
2018-10-30  9:05   ` Daniel Colascione
2018-10-30 20:45     ` Aleksa Sarai
2018-10-30 21:42       ` Joel Fernandes
2018-10-30 22:23         ` Aleksa Sarai
2018-10-30 22:33           ` Joel Fernandes
2018-10-30 22:49             ` Aleksa Sarai
2018-10-31  0:42               ` Joel Fernandes
2018-10-31  1:59                 ` Daniel Colascione
2018-10-30 23:10             ` Daniel Colascione
2018-10-30 23:23               ` Christian Brauner
2018-10-30 23:55                 ` Daniel Colascione
2018-10-31  2:56                 ` Aleksa Sarai
2018-10-31  4:24                   ` Joel Fernandes
2018-11-01 20:40                     ` Joel Fernandes
2018-11-02  9:46                       ` Christian Brauner
2018-11-02 14:34                         ` Serge E. Hallyn
2018-10-31  0:57               ` Joel Fernandes
2018-10-31  1:56                 ` Daniel Colascione
2018-10-31  4:47   ` Eric W. Biederman
2018-10-31  4:44 ` Eric W. Biederman
2018-10-31 12:44   ` Oleg Nesterov
2018-10-31 13:27     ` Daniel Colascione
2018-10-31 15:10       ` Oleg Nesterov
2018-10-31 15:16         ` Daniel Colascione
2018-10-31 15:49           ` Oleg Nesterov
2018-11-01 11:53       ` David Laight
2018-11-01 15:50         ` Daniel Colascione
2018-10-31 14:37 ` [PATCH v2] " Daniel Colascione
2018-10-31 15:05   ` Joel Fernandes
2018-10-31 17:33     ` Aleksa Sarai
2018-10-31 21:47       ` Joel Fernandes
2018-10-31 15:59 ` [PATCH v3] " Daniel Colascione
2018-10-31 17:54   ` Tycho Andersen
2018-10-31 18:00     ` Daniel Colascione
2018-10-31 18:17       ` Tycho Andersen
2018-10-31 19:33         ` Daniel Colascione
2018-10-31 20:06           ` Tycho Andersen
2018-11-01 11:33           ` David Laight
2018-11-12  1:19             ` Eric W. Biederman
2018-10-31 16:22 ` [RFC PATCH] " Jann Horn
2018-11-01  4:53   ` Andy Lutomirski
2018-11-12 23:13 ` Pavel Machek

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