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Date: Mon, 14 May 2018 11:01:17 +0200
From: Alexey Gladkov <gladkov.alexey@...il.com>
To: Jann Horn <jannh@...gle.com>
Cc: Kees Cook <keescook@...omium.org>, Andy Lutomirski <luto@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org,
	kernel list <linux-kernel@...r.kernel.org>,
	Kernel Hardening <kernel-hardening@...ts.openwall.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Akinobu Mita <akinobu.mita@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Jeff Layton <jlayton@...chiereds.net>,
	Ingo Molnar <mingo@...nel.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	aniel Micay <danielmicay@...il.com>,
	Jonathan Corbet <corbet@....net>, bfields@...ldses.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Solar Designer <solar@...nwall.com>,
	"Dmitry V. Levin" <ldv@...linux.org>,
	Djalal Harouni <tixxdz@...il.com>
Subject: Re: [PATCH v5 7/7] proc: add option to mount only a pids subset

On Fri, May 11, 2018 at 03:58:39PM +0200, Jann Horn wrote:
> On Fri, May 11, 2018 at 11:37 AM, Alexey Gladkov
> <gladkov.alexey@...il.com> wrote:
> > This allows to hide all files and directories in the procfs that are not
> > related to tasks.
> 
> /proc/$pid/net and /proc/$pid/task/$tid/net aren't in scope for this
> protection, even though they contain information about the whole
> network namespace of the task, right?

Yes. The pidonly makes visible only pids subset. You can still access the
process namespaces via /proc/$pid/ns.

We can think of additional constraints since the parameters are not
stored in the pid namespace anymore.

-- 
Rgrds, legion

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