linux-kernel - Re: [PATCH] Add possibility to set /dev/tty number

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Message-ID: <20160105152547.GC7251@kroah.com>
Date:	Tue, 5 Jan 2016 07:25:47 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Pierre Paul MINGOT <mingot.pierre@...il.com>
Cc:	"Austin S. Hemmelgarn" <ahferroin7@...il.com>, jslaby@...e.cz,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add possibility to set /dev/tty number

On Tue, Jan 05, 2016 at 09:51:14AM +0100, Pierre Paul MINGOT wrote:
> In industrial sector, for obvious security and safety reasons we want
> configure our system and have a full control of the devices within it.
> So unused or dummy devices are not wanted , not nice to have.
>  One way to achieve this goal is to have a full picture of the devices
> in our system and then identified which type of applications can run
> and then safety or security potential risks. Base on this analysis we
> can put in place mandatory actions to fix the risks.
> An other interest for reduce dummy /dev devices is hot-plug device
> creation detection through inotify or udev. Indeed, we can configure
> udev or inotify for monitoring the /dev directory and notify watched
> dedicated events. lesser the devices in /dev is better the response
> is. This aspect is crucial for RTOS with very high time constraint
> near of microseconds. It's the case for example for a system with
> Linux RT Patch or Xenomai.

I don't understand how reducing the number of vt devices makes anything
more or less secure, or better yet, more responsive.  Please provide
specific details showing how this happens.

thanks,

greg k-h
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