linux-kernel - RE: [PATCH v3] Implement /proc/pid/kill

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Message-ID: <c49f552e34784e8dbb40a43015bed642@AcuMS.aculab.com>
Date:   Thu, 1 Nov 2018 11:33:29 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Daniel Colascione' <dancol@...gle.com>,
        Tycho Andersen <tycho@...ho.ws>
CC:     linux-kernel <linux-kernel@...r.kernel.org>,
        Tim Murray <timmurray@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        "Suren Baghdasaryan" <surenb@...gle.com>,
        Aleksa Sarai <cyphar@...har.com>,
        "Christian Brauner" <christian.brauner@...onical.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Oleg Nesterov <oleg@...hat.com>
Subject: RE: [PATCH v3] Implement /proc/pid/kill

From: Daniel Colascione
> Sent: 31 October 2018 19:33
...
> You can't do it today with kill. The idea that keeping a open file
> descriptor to a /proc/pid or a file within it prevents PID reuse is
> widespread, but incorrect.

Is there a real good reason why that shouldn't be the case?
ie Holding a reference on the 'struct pid' being enough to stop reuse.

A patch to do that would be more generally useful.

	David

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