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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Sat, 30 Mar 2019 09:18:12 -0700
Message-ID: <CAHk-=wi1kQDVN22qv7M=bWU+CngZZXcPAMKCsDZMeuY3k2tkyg@mail.gmail.com>
Subject: Re: [PATCH v2 0/5] pid: add pidfd_open()
To:     Daniel Colascione <dancol@google.com>
Cc:     Christian Brauner <christian@brauner.io>,
        Jann Horn <jannh@google.com>,
        Andrew Lutomirski <luto@kernel.org>,
        David Howells <dhowells@redhat.com>,
        "Serge E. Hallyn" <serge@hallyn.com>,
        Linux API <linux-api@vger.kernel.org>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        Arnd Bergmann <arnd@arndb.de>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
        Kees Cook <keescook@chromium.org>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Michael Kerrisk-manpages <mtk.manpages@gmail.com>,
        Jonathan Kowalski <bl0pbl33p@gmail.com>,
        "Dmitry V. Levin" <ldv@altlinux.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Oleg Nesterov <oleg@redhat.com>,
        Nagarathnam Muthusamy <nagarathnam.muthusamy@oracle.com>,
        Aleksa Sarai <cyphar@cyphar.com>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Joel Fernandes <joel@joelfernandes.org>
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On Sat, Mar 30, 2019 at 9:16 AM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> And no, we are *NOT* making pidfd_open() into some "let's expose /proc
> even when it's not mounted" horror. Seriously. That's disgusting,
> wrong, insecure and stupid.

And btw, this is not debatable. In fact, this whole discussion is
making me feel like I should just revert pidfd, not because the code I
merged is wrong, but because people are clearly intending to do
completely inappropriate things with this.

Get your act together.  Stop hacking up garbage.

               Linus