From: Johan Hovold <johan@xxxxxxxxxx> 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@xxxxxxxxxxxxxxx Signed-off-by: Johan Hovold <johan@xxxxxxxxxx> Link: https://lore.kernel.org/r/20210407102334.32361-9-johan@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/tty/amiserial.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/tty/amiserial.c +++ b/drivers/tty/amiserial.c @@ -970,6 +970,7 @@ static int set_serial_info(struct tty_st 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))) {
