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Message-Id: <20131003040637.925829084@linuxfoundation.org>
Date: Wed, 2 Oct 2013 21:08:45 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>,
Peter Hurley <peter@...leysoftware.com>
Subject: [ 19/57] tty: Fix SIGTTOU not sent with tcflush()
3.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Peter Hurley <peter@...leysoftware.com>
commit 5cec7bf699c61d14f0538345076480bb8c8ebfbb upstream.
Commit 'e7f3880cd9b98c5bf9391ae7acdec82b75403776'
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.
Reported-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Peter Hurley <peter@...leysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/tty/tty_ioctl.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/tty/tty_ioctl.c
+++ b/drivers/tty/tty_ioctl.c
@@ -1201,6 +1201,9 @@ int n_tty_ioctl_helper(struct tty_struct
}
return 0;
case TCFLSH:
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
return __tty_perform_flush(tty, arg);
default:
/* Try the mode commands */
--
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