linux-kernel - Re: [PATCH v2] locks: Filter /proc/locks output on proc pid ns

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Date:	Wed, 03 Aug 2016 12:35:39 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Nikolay Borisov <kernel@...p.com>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Pavel Emelyanov <xemul@...tuozzo.com>,
	Jeff Layton <jlayton@...chiereds.net>,
	Andrey Vagin <avagin@...nvz.org>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH v2] locks: Filter /proc/locks output on proc pid ns

Nikolay Borisov <kernel@...p.com> writes:

> On 08/03/2016 06:06 PM, J. Bruce Fields wrote:
>> Digging around...  Oh, I see, there's an optional 'lock:..' line in
>> /proc/[pid]/fdinfo/[pid] file, is that what you're looking at?  I'd
>> forgotten.  Yeah, maybe that would make more sense long term.
>
> Yep, that's the one but this requires the userspace to be updated to use
> that interface. In the meantime we could do away with some maintenance
> of the existing /proc/locks :)

I am tempted to say let's not change /proc/locks at all, but if locks
really are in a pid namespace than I do think it makes sense to filter
them in /proc just so there is not excessive visiblity outside of the
pid namespace.

Excessive visibility is a problem on it's own.

Eric