tree 105031898b999a9da275a7aa32b5d67733d5b849
parent d94206028854ba4c891004cecdbb2e220bf277bb
author Petr Písař <ppisar@redhat.com> 1302854888 +0200
committer Greg Kroah-Hartman <gregkh@suse.de> 1303256017 -0700

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>