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Date:   Thu, 12 Jul 2018 18:52:04 +0100
From:   Al Viro <viro@ZenIV.linux.org.uk>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     David Howells <dhowells@redhat.com>,
        Andrew Lutomirski <luto@kernel.org>,
        Linux API <linux-api@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Jann Horn <jannh@google.com>
Subject: Re: [PATCH 24/32] vfs: syscall: Add fsopen() to prepare for
 superblock creation [ver #9]
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On Thu, Jul 12, 2018 at 09:39:31AM -0700, Linus Torvalds wrote:

> > [1] one man's data is another man's commands, for starters.  All networking
> > protocols would fit your description.  So would ANSI escape sequences ("move
> > cursor to line 12 column 45" does sound like a command), so would writing
> > postscript to printer, etc.
> 
> .. and all of that is just data to the kernel.
> 
> Yes, vt100 escape sequences etc _are_ commands, and boy have we had
> bugs in that area. But there the excuse is "that's how the world is".

... along with "something similar to ncurses-based programs usable over
ssh is a good thing to have, without having said ssh somehow intercept
and marshal ioctls" ;-)  I can just imagine something e.g. RDMA people
would've designed instead... OTOH, I'm eating right now, so better
not go there...