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Subject: Re: [PATCH v5 5/7] proc: instantiate only pids that we can ptrace on
 'limit_pids=1' mount option
To:     Alexey Gladkov <gladkov.alexey@gmail.com>,
        Kees Cook <keescook@chromium.org>,
        Andy Lutomirski <luto@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        kernel-hardening@lists.openwall.com,
        linux-security-module@vger.kernel.org, linux-api@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Akinobu Mita <akinobu.mita@gmail.com>,
        Oleg Nesterov <oleg@redhat.com>,
        Jeff Layton <jlayton@poochiereds.net>,
        Ingo Molnar <mingo@kernel.org>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        aniel Micay <danielmicay@gmail.com>,
        Jonathan Corbet <corbet@lwn.net>, bfields@fieldses.org,
        Stephen Rothwell <sfr@canb.auug.org.au>, solar@openwall.com,
        "Dmitry V. Levin" <ldv@altlinux.org>,
        Djalal Harouni <tixxdz@gmail.com>
References: <20180511093613.GA1330@comp-core-i7-2640m-0182e6>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <7c638a92-8c40-fa15-8c63-777232588137@infradead.org>
Date:   Fri, 11 May 2018 09:09:04 -0700
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On 05/11/2018 02:36 AM, Alexey Gladkov wrote:
> From: Djalal Harouni <tixxdz@gmail.com>
> 
> If "limit_pids=1" mount option is set then do not instantiate pids that
> we can not ptrace. "limit_pids=1" means that procfs should only contain
> pids that the caller can ptrace.

Where can I find documentation on these mount options (pidonly, limit_pids)?

Thanks.

> Cc: Kees Cook <keescook@chromium.org>
> Cc: Andy Lutomirski <luto@kernel.org>
> Signed-off-by: Djalal Harouni <tixxdz@gmail.com>
> ---
>  fs/proc/base.c | 9 +++++++++
>  1 file changed, 9 insertions(+)


-- 
~Randy