From: Petr Písař <ppisar@redhat.com>
Date: Fri, 15 Apr 2011 08:08:08 +0000 (+0200)
Subject: tty: Clean console safely
X-Git-Tag: v3.0-rc1~338^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f8df13e0a901fe55631fed66562369b4dba40f8b;p=pandora-kernel.git

tty: Clean console safely

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.

Signed-off-by: Petr Písař <ppisar@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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