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Date:   Sat, 28 Mar 2020 22:25:47 +0100
From:   Alexey Gladkov <gladkov.alexey@gmail.com>
To:     Kees Cook <keescook@chromium.org>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Kernel Hardening <kernel-hardening@lists.openwall.com>,
        Linux API <linux-api@vger.kernel.org>,
        Linux FS Devel <linux-fsdevel@vger.kernel.org>,
        Linux Security Module <linux-security-module@vger.kernel.org>,
        Akinobu Mita <akinobu.mita@gmail.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@kernel.org>,
        Daniel Micay <danielmicay@gmail.com>,
        Djalal Harouni <tixxdz@gmail.com>,
        "Dmitry V . Levin" <ldv@altlinux.org>,
        "Eric W . Biederman" <ebiederm@xmission.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Ingo Molnar <mingo@kernel.org>,
        "J . Bruce Fields" <bfields@fieldses.org>,
        Jeff Layton <jlayton@poochiereds.net>,
        Jonathan Corbet <corbet@lwn.net>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Oleg Nesterov <oleg@redhat.com>
Subject: Re: [PATCH v10 7/9] proc: move hidepid values to uapi as they are
 user interface to mount
Message-ID: <20200328212547.xxiqxqhxzwp6w5n5@comp-core-i7-2640m-0182e6>
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 <20200327172331.418878-8-gladkov.alexey@gmail.com>
 <202003281340.B73225DCC9@keescook>
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On Sat, Mar 28, 2020 at 01:41:02PM -0700, Kees Cook wrote:
 > diff --git a/include/uapi/linux/proc_fs.h b/include/uapi/linux/proc_fs.h
> > new file mode 100644
> > index 000000000000..dc6d717aa6ec
> > --- /dev/null
> > +++ b/include/uapi/linux/proc_fs.h
> > @@ -0,0 +1,13 @@
> > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> > +#ifndef _UAPI_PROC_FS_H
> > +#define _UAPI_PROC_FS_H
> > +
> > +/* definitions for hide_pid field */
> > +enum {
> > +	HIDEPID_OFF            = 0,
> > +	HIDEPID_NO_ACCESS      = 1,
> > +	HIDEPID_INVISIBLE      = 2,
> > +	HIDEPID_NOT_PTRACEABLE = 4,
> > +};
> > +
> > +#endif
> > -- 
> > 2.25.2
> > 
> 
> Should the numeric values still be UAPI if there is string parsing now?

I think yes, because these are still valid hidepid= values.

-- 
Rgrds, legion