media: dvb-core: Fix use-after-free due to race condition occurring in dvb_ca_en50221

Commit Message

Hyunwoo Kim Nov. 21, 2022, 6:33 a.m. UTC

If the device node of dvb_ca_en50221 is open() and the
device is disconnected, a UAF may occur when calling
close() on the device node.

The root cause is that wake_up() and wait_event() for
dvbdev->wait_queue are not implemented.

So implement wait_event() function in dvb_ca_en50221_release()
and add 'remove_mutex' which prevents race condition
for 'ca->exit'.

Signed-off-by: Hyunwoo Kim <[e-mail]>
---
 drivers/media/dvb-core/dvb_ca_en50221.c | 36 ++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

Comments

Takashi Iwai Jan. 10, 2023, 2:20 p.m. UTC | #1

On Mon, 21 Nov 2022 07:33:08 +0100,
Hyunwoo Kim wrote:
> 
> If the device node of dvb_ca_en50221 is open() and the
> device is disconnected, a UAF may occur when calling
> close() on the device node.
> 
> The root cause is that wake_up() and wait_event() for
> dvbdev->wait_queue are not implemented.
> 
> So implement wait_event() function in dvb_ca_en50221_release()
> and add 'remove_mutex' which prevents race condition
> for 'ca->exit'.
> 
> Signed-off-by: Hyunwoo Kim <[e-mail]>

Just wonder what happens on this.  Is this still persistent with the
latest upstream kernel?

Note that CVE-2022-45919 has been assigned to this bug.


thanks,

Takashi

Patch

diff --git a/drivers/media/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb-core/dvb_ca_en50221.c
index 15a08d8c69ef..60133a315701 100644
--- a/drivers/media/dvb-core/dvb_ca_en50221.c
+++ b/drivers/media/dvb-core/dvb_ca_en50221.c
@@ -151,6 +151,12 @@  struct dvb_ca_private {
 
 	/* mutex serializing ioctls */
 	struct mutex ioctl_mutex;
+
+	/* A mutex used when a device is disconnected */
+	struct mutex remove_mutex;
+
+	/* Whether the device is disconnected */
+	int exit;
 };
 
 static void dvb_ca_private_free(struct dvb_ca_private *ca)
@@ -1709,12 +1715,22 @@  static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
 
 	dprintk("%s\n", __func__);
 
-	if (!try_module_get(ca->pub->owner))
+	mutex_lock(&ca->remove_mutex);
+
+	if (ca->exit) {
+		mutex_unlock(&ca->remove_mutex);
+		return -ENODEV;
+	}
+
+	if (!try_module_get(ca->pub->owner)) {
+		mutex_unlock(&ca->remove_mutex);
 		return -EIO;
+	}
 
 	err = dvb_generic_open(inode, file);
 	if (err < 0) {
 		module_put(ca->pub->owner);
+		mutex_unlock(&ca->remove_mutex);
 		return err;
 	}
 
@@ -1739,6 +1755,7 @@  static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
 
 	dvb_ca_private_get(ca);
 
+	mutex_unlock(&ca->remove_mutex);
 	return 0;
 }
 
@@ -1758,6 +1775,8 @@  static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
 
 	dprintk("%s\n", __func__);
 
+	mutex_lock(&ca->remove_mutex);
+
 	/* mark the CA device as closed */
 	ca->open = 0;
 	dvb_ca_en50221_thread_update_delay(ca);
@@ -1768,6 +1787,12 @@  static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
 
 	dvb_ca_private_put(ca);
 
+	if (dvbdev->users == 1 && ca->exit == 1) {
+		mutex_unlock(&ca->remove_mutex);
+		wake_up(&dvbdev->wait_queue);
+	} else
+		mutex_unlock(&ca->remove_mutex);
+
 	return err;
 }
 
@@ -1891,6 +1916,7 @@  int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
 	}
 
 	mutex_init(&ca->ioctl_mutex);
+	mutex_init(&ca->remove_mutex);
 
 	if (signal_pending(current)) {
 		ret = -EINTR;
@@ -1933,6 +1959,14 @@  void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
 
 	dprintk("%s\n", __func__);
 
+	mutex_lock(&ca->remove_mutex);
+	ca->exit = 1;
+	mutex_unlock(&ca->remove_mutex);
+
+	if (ca->dvbdev->users < 1)
+		wait_event(ca->dvbdev->wait_queue,
+				ca->dvbdev->users == 1);
+
 	/* shutdown the thread if there was one */
 	kthread_stop(ca->thread);