linux-kernel - [PATCH] tty restore locked ioctl file op

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Date:	Fri, 08 Jun 2007 15:34:17 -0500
From:	Paul Fulghum <paulkf@...rogate.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Björn Steinbrink <B.Steinbrink@....de>,
	Arnd Bergmann <arnd@...db.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Nicolas Mailhot <nicolas.mailhot@...oste.net>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...zilla.kernel.org>, linux-kernel@...r.kernel.org,
	Mel Gorman <mel@....ul.ie>,
	Christoph Lameter <clameter@....com>
Subject: [PATCH] tty restore locked ioctl file op

Restore tty locked ioctl handler which was replaced with
an unlocked ioctl handler in hung_up_tty_fops by the patch:

commit e10cc1df1d2014f68a4bdcf73f6dd122c4561f94
Author: Paul Fulghum <paulkf@...rogate.com>
Date:   Thu May 10 22:22:50 2007 -0700

    tty: add compat_ioctl

This was reported in:
[Bug 8473] New: Oops: 0010 [1] SMP

The bug is caused by switching to hung_up_tty_fops in do_tty_hangup.
An ioctl call can be waiting on BLK after testing for existence of
the locked ioctl handler in the normal tty fops, but before calling
the locked ioctl handler. If a hangup occurs at that point, the
locked ioctl fop is NULL and an oops occurs.

Signed-off-by: Paul Fulghum <paulkf@...rogate.com>

--- a/drivers/char/tty_io.c	2007-06-08 14:26:10.000000000 -0500
+++ b/drivers/char/tty_io.c	2007-06-08 14:28:58.000000000 -0500
@@ -1173,8 +1173,14 @@ static unsigned int hung_up_tty_poll(str
 	return POLLIN | POLLOUT | POLLERR | POLLHUP | POLLRDNORM | POLLWRNORM;
 }
 
-static long hung_up_tty_ioctl(struct file * file,
-			      unsigned int cmd, unsigned long arg)
+static int hung_up_tty_ioctl(struct inode * inode, struct file * file,
+			     unsigned int cmd, unsigned long arg)
+{
+	return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
+}
+
+static long hung_up_tty_compat_ioctl(struct file * file,
+				     unsigned int cmd, unsigned long arg)
 {
 	return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
 }
@@ -1222,8 +1228,8 @@ static const struct file_operations hung
 	.read		= hung_up_tty_read,
 	.write		= hung_up_tty_write,
 	.poll		= hung_up_tty_poll,
-	.unlocked_ioctl = hung_up_tty_ioctl,
-	.compat_ioctl	= hung_up_tty_ioctl,
+	.ioctl		= hung_up_tty_ioctl,
+	.compat_ioctl	= hung_up_tty_compat_ioctl,
 	.release	= tty_release,
 };
 



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