linux-kernel - Re: [PATCH RFC v3 6/7] proc: support new 'pids=all|ptraceable' mount option

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Message-ID: <CAEiveUe5pRBConqj_QhD6Kax2rH4nAD+=7X5kWX-+C66v-kS9g@mail.gmail.com>
Date:   Fri, 10 Nov 2017 11:38:00 +0100
From:   Djalal Harouni <tixxdz@...il.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Alexey Gladkov <gladkov.alexey@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        LSM List <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>,
        "Tobin C. Harding" <me@...in.cc>, 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>,
        Daniel Micay <danielmicay@...il.com>,
        Jonathan Corbet <corbet@....net>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Solar Designer <solar@...nwall.com>
Subject: Re: [PATCH RFC v3 6/7] proc: support new 'pids=all|ptraceable' mount option

On Fri, Nov 10, 2017 at 3:38 AM, Andy Lutomirski <luto@...nel.org> wrote:
> On Thu, Nov 9, 2017 at 8:14 AM, Djalal Harouni <tixxdz@...il.com> wrote:
>> This patch introduces the new 'pids' mount option, as it was discussed
>> and suggested by Andy Lutomirski [1].
>>
>> * If 'pids=' is passed without 'newinstance' then it has no effect.
>
> Would it be safer this were an error instead?

Hm, I tend to say that you are right, but I also keep your comment
when you said that "newinstance" should be the default later and users
won't have to explicitly pass it. What you think ?

-- 
tixxdz