Commit 5cec7bf6 authored Sep 25, 2013 by Peter Hurley Committed by Greg Kroah-Hartman Sep 25, 2013

tty: Fix SIGTTOU not sent with tcflush()



Commit 'e7f3880c'
  tty: Fix recursive deadlock in tty_perform_flush()
introduced a regression where tcflush() does not generate
SIGTTOU for background process groups.

Make sure ioctl(TCFLSH) calls tty_check_change() when
invoked from the line discipline.

Cc: stable@vger.kernel.org # v3.10+
Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 93a8d416

drivers/tty/tty_ioctl.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1201,6 +1201,9 @@ int n_tty_ioctl_helper(struct tty_struct tty, struct file file,
		}
		return 0;
		case TCFLSH:
		retval = tty_check_change(tty);
		if (retval)
		return retval;
		return __tty_perform_flush(tty, arg);
		default:
		/* Try the mode commands */