linux-kernel - Re: [PATCH v3 2/3] nsproxy: attach to namespaces via pidfds

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Message-ID: <87h7wvoefw.fsf@x220.int.ebiederm.org>
Date:   Mon, 04 May 2020 11:25:07 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Stéphane Graber <stgraber@...ntu.com>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        Serge Hallyn <serge@...lyn.com>, Jann Horn <jannh@...gle.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Aleksa Sarai <cyphar@...har.com>, linux-api@...r.kernel.org
Subject: Re: [PATCH v3 2/3] nsproxy: attach to namespaces via pidfds

I am not thrilled about treating nstype as a flags fields when it is not
currently.  It was my hope when I designed the interface that not
treating nstype as a flags field would save us from the problem of bits
running out.

That aside.  It would be very good if the default version of setting
everything from a pidfd would set the root directory from the process it
is copying everything else from.

Eric