linux-kernel - Re: [PATCH v2 0/5] pid: add pidfd

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Message-ID: <CAHk-=wjq4dTPcz-qsvhpm5F42SDHCoqEWv1V=rs_kt6MC=ZThA@mail.gmail.com>
Date:   Sat, 30 Mar 2019 09:09:10 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Christian Brauner <christian@...uner.io>
Cc:     Jann Horn <jannh@...gle.com>, Andrew Lutomirski <luto@...nel.org>,
        David Howells <dhowells@...hat.com>, serge@...lyn.com,
        Linux API <linux-api@...r.kernel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Kees Cook <keescook@...omium.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Kerrisk-manpages <mtk.manpages@...il.com>,
        bl0pbl33p@...il.com, "Dmitry V. Levin" <ldv@...linux.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        nagarathnam.muthusamy@...cle.com, Aleksa Sarai <cyphar@...har.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Joel Fernandes <joel@...lfernandes.org>, dancol@...gle.com
Subject: Re: [PATCH v2 0/5] pid: add pidfd_open()

On Fri, Mar 29, 2019 at 8:54 AM Christian Brauner <christian@...uner.io> wrote:
>
> /* Introduction */
> This adds the pidfd_open() syscall.
> pidfd_open() allows to retrieve file descriptors for a given pid. This
> includes both file descriptors for processes and file descriptors for
> threads.

I'm ok with the pidfd_open() call to just get a pidfd, but that
"pidfd_to_profs()" needs to go away.

If you want to open the /proc/<pid>/status file, then just do that.
This whole "do one and convert to the other" needs to die. No, no, no.

                   Linus