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Date: Sun, 29 Mar 2020 00:00:46 +0100
From: Alexey Gladkov <gladkov.alexey@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Kernel Hardening <kernel-hardening@...ts.openwall.com>,
	Linux API <linux-api@...r.kernel.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux Security Module <linux-security-module@...r.kernel.org>,
	Akinobu Mita <akinobu.mita@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Daniel Micay <danielmicay@...il.com>,
	Djalal Harouni <tixxdz@...il.com>,
	"Dmitry V . Levin" <ldv@...linux.org>,
	"Eric W . Biederman" <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	"J . Bruce Fields" <bfields@...ldses.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	Jonathan Corbet <corbet@....net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH v10 7/9] proc: move hidepid values to uapi as they are
 user interface to mount

On Sat, Mar 28, 2020 at 02:53:49PM -0700, Kees Cook wrote:
> > > > +/* definitions for hide_pid field */
> > > > +enum {
> > > > +	HIDEPID_OFF            = 0,
> > > > +	HIDEPID_NO_ACCESS      = 1,
> > > > +	HIDEPID_INVISIBLE      = 2,
> > > > +	HIDEPID_NOT_PTRACEABLE = 4,
> > > > +};
> > > Should the numeric values still be UAPI if there is string parsing now?
> > 
> > I think yes, because these are still valid hidepid= values.
> 
> But if we don't expose the values, we can do whatever we like with
> future numbers (e.g. the "is this a value or a bit field?" question).

Alexey Dobriyan suggested to put these parameters into the UAPI and it
makes sense because these are user parameters.

-- 
Rgrds, legion

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