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From: Werner Almesberger <wa@almesberger.net>
To: Robert Love <rml@tech9.net>
Cc: Julien Oster <frodo@dereference.de>, linux-kernel@vger.kernel.org
Subject: Re: kernel ring buffer accessible by users
Date: Wed, 23 Apr 2003 13:23:59 -0300	[thread overview]
Message-ID: <20030423132359.B3557@almesberger.net> (raw)
In-Reply-To: <1051113589.707.948.camel@localhost>; from rml@tech9.net on Wed, Apr 23, 2003 at 11:59:49AM -0400

Robert Love wrote:
> Why on earth would the user give the kernel a password?

That's just an example. It could be any other sensitive information,
including kernel state that you don't want to reveal to users.

I think it's a reasonable assumption that one can speak freely in a
printk message. Avoiding to print anything that may possibly contain
sensitive information is likely to make messages less useful, just
think of all the data revealed in an oops.

> The point is user input like telephone numbers or passwords should never
> be fed into the kernel anyhow.

Yes, a bit odd. Maybe because of "intelligent" cards that implement
the signalling in firmware. Anyway, this is an entirely different
issue.
 
- Werner

-- 
  _________________________________________________________________________
 / Werner Almesberger, Buenos Aires, Argentina         wa@almesberger.net /
/_http://www.almesberger.net/____________________________________________/

  reply	other threads:[~2003-04-23 16:12 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-04-22 16:21 kernel ring buffer accessible by users Julien Oster
2003-04-22 16:44 ` Michael Buesch
2003-04-22 16:52   ` Grzegorz Jaskiewicz
2003-04-22 16:54   ` Jörn Engel
2003-04-22 16:54   ` Julien Oster
2003-04-22 17:54     ` Richard B. Johnson
2003-04-22 17:17 ` Robert Love
2003-04-23 15:56   ` Werner Almesberger
2003-04-23 15:59     ` Robert Love
2003-04-23 16:23       ` Werner Almesberger [this message]
2003-04-24  0:30         ` David Wagner
2003-04-24 14:02       ` Grzegorz Jaskiewicz
2003-04-23 16:05     ` Julien Oster
2003-04-23 16:45       ` Werner Almesberger
2003-04-23 16:59         ` Frank v Waveren
2003-04-24  0:31       ` David Wagner
2003-04-24 13:10         ` Stephan von Krawczynski
2003-04-22 19:53 ` Jason Cook
2003-04-23  9:33 ` Olaf Hering

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