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tty: amiserial: fix TIOCSSERIAL permission check 

commit 1d31a831cc04f5f942de3e7d91edaa52310d3c99 upstream.

Changing the port closing_wait parameter is a privileged operation.

Add the missing check to TIOCSSERIAL so that -EPERM is returned in case
an unprivileged user tries to change the closing-wait setting.

Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210407102334.32361-9-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2021-04-07 12:23:26 +02:00 committed by Greg Kroah-Hartman
parent e503d7bc7b
commit edce324120
1 changed files with 1 additions and 0 deletions
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drivers/tty/amiserial.c
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@ -1032,6 +1032,7 @@ static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
if (!serial_isroot()) {
if ((ss->baud_base != state->baud_base) ||
(ss->close_delay != port->close_delay) ||
(ss->closing_wait != port->closing_wait) ||
(ss->xmit_fifo_size != state->xmit_fifo_size) ||
((ss->flags & ~ASYNC_USR_MASK) !=
(port->flags & ~ASYNC_USR_MASK))) {