linux-kernel - Re: [RESEND v3 PATCH 3/3] vfs: make mounts and mountstats honor root dir like mountinfo does

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Date:	Mon, 29 Sep 2014 22:43:33 +0400
From:	"Dmitry V. Levin" <ldv@...linux.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND v3 PATCH 3/3] vfs: make mounts and mountstats honor root dir like mountinfo does

On Mon, Sep 29, 2014 at 07:32:22PM +0100, Al Viro wrote:
> On Mon, Sep 29, 2014 at 10:05:23PM +0400, Dmitry V. Levin wrote:
> > Date: Wed, 17 Oct 2012 20:29:55 +0400
> > 
> > Change show_vfsmnt() and show_vfsstat() to show mountpoints relative
> > to the root directory and skip mountpoints outside of chroot jail
> > the same way as show_mountinfo() does.
> 
> Sigh...  Repeat after me:  We  Do  Not  Break  Userland.  Care to explain
> why that change won't do just that?

This is definitely an information leak, and I cannot imagine how these
unaccessible entries listed in /proc/self/mounts and /proc/self/mountstats
could be used sanely.

-- 
ldv
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