linux-kernel - Re: [PATCH] Clean console safely

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Message-ID: <20110413153359.GC2993@dhcp-0-146.brq.redhat.com>
Date:	Wed, 13 Apr 2011 17:33:59 +0200
From:	Petr Pisar <ppisar@...hat.com>
To:	Greg KH <gregkh@...e.de>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	Artem Bityutskiy <dedekind1@...il.com>
Subject: Re: [PATCH] Clean console safely

On Wed, Apr 13, 2011 at 08:01:13AM -0700, Greg KH wrote:
> On Wed, Apr 13, 2011 at 04:54:33PM +0200, Petr Písař wrote:
> > Traditional \E[2J sequence erases console display but scroll-back
> > buffer and underlying device (frame) buffer keep data that can be
> > accessed by scrolling console back.
> > 
> > This patch introduce new \E[J parameter 3 that allows to scramble
> > scroll-back buffer explicitly. Session locking programs (screen,
> > vlock) can use it to prevent attacker to browse locked console
> > history.
> 
> Is this also documented somewhere so that people know about it?
> 
> 
Not yet as this is fresh feature. I'd like to put few words into
console_codes(4). I guess manual sources are not part of Linux.

-- Petr
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