linux-kernel - Re: [PATCH v10 7/9] proc: move hidepid values to uapi as they are user interface to mount

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Message-ID: <202003281340.B73225DCC9@keescook>
Date:   Sat, 28 Mar 2020 13:41:02 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Alexey Gladkov <gladkov.alexey@...il.com>
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>,
        Alexey Gladkov <legion@...nel.org>,
        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 Fri, Mar 27, 2020 at 06:23:29PM +0100, Alexey Gladkov wrote:
> Suggested-by: Alexey Dobriyan <adobriyan@...il.com>
> Reviewed-by: Alexey Dobriyan <adobriyan@...il.com>
> Signed-off-by: Alexey Gladkov <gladkov.alexey@...il.com>
> ---
>  include/linux/proc_fs.h      |  9 +--------
>  include/uapi/linux/proc_fs.h | 13 +++++++++++++
>  2 files changed, 14 insertions(+), 8 deletions(-)
>  create mode 100644 include/uapi/linux/proc_fs.h
> 
> diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
> index afd38cae2339..d259817ec913 100644
> --- a/include/linux/proc_fs.h
> +++ b/include/linux/proc_fs.h
> @@ -7,6 +7,7 @@
>  
>  #include <linux/types.h>
>  #include <linux/fs.h>
> +#include <uapi/linux/proc_fs.h>
>  
>  struct proc_dir_entry;
>  struct seq_file;
> @@ -27,14 +28,6 @@ struct proc_ops {
>  	unsigned long (*proc_get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
>  };
>  
> -/* definitions for hide_pid field */
> -enum {
> -	HIDEPID_OFF	  = 0,
> -	HIDEPID_NO_ACCESS = 1,
> -	HIDEPID_INVISIBLE = 2,
> -	HIDEPID_NOT_PTRACEABLE = 4, /* Limit pids to only ptraceable pids */
> -};
> -
>  /* definitions for proc mount option pidonly */
>  enum {
>  	PROC_PIDONLY_OFF = 0,
> 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?

-- 
Kees Cook