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

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Message-ID: <65440fd9977a2e1f0467b7ece38240e5dac2b736.camel@opteya.com>
Date:   Mon, 01 Apr 2019 10:47:11 +0200
From:   Yann Droneaud <ydroneaud@...eya.com>
To:     Jann Horn <jannh@...gle.com>,
        Christian Brauner <christian@...uner.io>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Daniel Colascione <dancol@...gle.com>,
        Andrew Lutomirski <luto@...nel.org>,
        David Howells <dhowells@...hat.com>,
        "Serge E. Hallyn" <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>,
        Jonathan Kowalski <bl0pbl33p@...il.com>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: Re: [PATCH v2 0/5] pid: add pidfd_open()

Hi,

Le lundi 01 avril 2019 à 02:52 +0200, Jann Horn a écrit :

> One minor detail to keep in mind for the future is that in a
> straightforward implementation of this concept, if a non-capable
> process is running in a mount namespace, but in the initial network
> namespace, without any reachable /proc mount, it will be able to look
> at information about other processes' network connections by first
> using pidfd_open() on itself or by using clone(CLONE_PIDFD), then
> looking at the "net" directory under the resulting file descriptor.

I also think it would punch a hole in chroot() ... (but in 2019, nobody
should rely on it for security purpose).

Regards.

-- 
Yann Droneaud
OPTEYA