tty: wipe buffer if not echoing data
authorGreg Kroah-Hartman <greg@kroah.com>
Thu, 4 Oct 2018 18:06:14 +0000 (11:06 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 1 Dec 2018 08:42:59 +0000 (09:42 +0100)
commitb008f3b25588868a89e9e4562b4dc641d1032553
tree5ed69b367930dbbcd8e54a0de82525e201894171
parent5e063b64163be65e2f04588808760e790a889e3c
tty: wipe buffer if not echoing data

commit b97b3d9fb57860a60592859e332de7759fd54c2e upstream.

If we are not echoing the data to userspace or the console is in icanon
mode, then perhaps it is a "secret" so we should wipe it once we are
done with it.

This mirrors the logic that the audit code has.

Reported-by: aszlig <aszlig@nix.build>
Tested-by: Milan Broz <gmazyland@gmail.com>
Tested-by: Daniel Zatovic <daniel.zatovic@gmail.com>
Tested-by: aszlig <aszlig@nix.build>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/n_tty.c