tty: Clean console safely

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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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Petr Písař 2011-04-15 10:08:08 +02:00 • committed by Greg Kroah-Hartman

parent d942060288

commit f8df13e0a9

1 changed files with 7 additions and 0 deletions

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7

drivers/tty/vt/vt.c

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