Vulnerability: sound/core/timer.c in the Linux kernel before 4.4.1 uses an incorrect type of mutex, which allows local users to cause a denial of service (race condition, use-after-free, and system crash) via a crafted ioctl call.
Vulnerability ID: CVE-2016-2546
CWE: CWE-362
Severity score: 6.9
Project: https://github.com/torvalds/linux
Published: 2016-04-27
File: sound/core/timer.c
Commit message: ALSA: timer: Fix race among timer ioctls

ALSA timer ioctls have an open race and this may lead to a
use-after-free of timer instance object.  A simplistic fix is to make
each ioctl exclusive.  We have already tread_sem for controlling the
tread, and extend this as a global mutex to be applied to each ioctl.

The downside is, of course, the worse concurrency.  But these ioctls
aren't to be parallel accessible, in anyway, so it should be fine to
serialize there.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Commit author: Takashi Iwai

Vulnerable version (before fix):
 struct snd_timer_user { 	struct timespec tstamp;		/* trigger tstamp */ 	wait_queue_head_t qchange_sleep; 	struct fasync_struct *fasync; 	struct mutex tread_sem; };  /* list of timers */ static int snd_timer_user_open(struct inode *inode, struct file *file) 		return -ENOMEM; 	spin_lock_init(&tu->qlock); 	init_waitqueue_head(&tu->qchange_sleep); 	mutex_init(&tu->tread_sem); 	tu->ticks = 1; 	tu->queue_size = 128; 	tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), static int snd_timer_user_release(struct inode *inode, struct file *file) 	if (file->private_data) { 		tu = file->private_data; 		file->private_data = NULL; 		if (tu->timeri) 			snd_timer_close(tu->timeri); 		kfree(tu->queue); 		kfree(tu->tqueue); 		kfree(tu); static int snd_timer_user_tselect(struct file *file, 	int err = 0;  	tu = file->private_data; 	mutex_lock(&tu->tread_sem); 	if (tu->timeri) { 		snd_timer_close(tu->timeri); 		tu->timeri = NULL; static int snd_timer_user_tselect(struct file *file, 	}        __err:       	mutex_unlock(&tu->tread_sem); 	return err; }  enum { 	SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), };  static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 				 unsigned long arg) { 	struct snd_timer_user *tu; static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 	{ 		int xarg;  		mutex_lock(&tu->tread_sem); 		if (tu->timeri)	{	/* too late */ 			mutex_unlock(&tu->tread_sem); 			return -EBUSY; 		} 		if (get_user(xarg, p)) { 			mutex_unlock(&tu->tread_sem); 			return -EFAULT; 		} 		tu->tread = xarg ? 1 : 0; 		mutex_unlock(&tu->tread_sem); 		return 0; 	} 	case SNDRV_TIMER_IOCTL_GINFO: static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 	return -ENOTTY; }  static int snd_timer_user_fasync(int fd, struct file * file, int on) { 	struct snd_timer_user *tu;

Fixed version (after fix):
 struct snd_timer_user { 	struct timespec tstamp;		/* trigger tstamp */ 	wait_queue_head_t qchange_sleep; 	struct fasync_struct *fasync; 	struct mutex ioctl_lock; };  /* list of timers */ static int snd_timer_user_open(struct inode *inode, struct file *file) 		return -ENOMEM; 	spin_lock_init(&tu->qlock); 	init_waitqueue_head(&tu->qchange_sleep); 	mutex_init(&tu->ioctl_lock); 	tu->ticks = 1; 	tu->queue_size = 128; 	tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), static int snd_timer_user_release(struct inode *inode, struct file *file) 	if (file->private_data) { 		tu = file->private_data; 		file->private_data = NULL; 		mutex_lock(&tu->ioctl_lock); 		if (tu->timeri) 			snd_timer_close(tu->timeri); 		mutex_unlock(&tu->ioctl_lock); 		kfree(tu->queue); 		kfree(tu->tqueue); 		kfree(tu); static int snd_timer_user_tselect(struct file *file, 	int err = 0;  	tu = file->private_data; 	if (tu->timeri) { 		snd_timer_close(tu->timeri); 		tu->timeri = NULL; static int snd_timer_user_tselect(struct file *file, 	}        __err: 	return err; }  enum { 	SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), };  static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, 				 unsigned long arg) { 	struct snd_timer_user *tu; static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 	{ 		int xarg;  		if (tu->timeri)	/* too late */ 			return -EBUSY; 		if (get_user(xarg, p)) 			return -EFAULT; 		tu->tread = xarg ? 1 : 0; 		return 0; 	} 	case SNDRV_TIMER_IOCTL_GINFO: static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 	return -ENOTTY; }  static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 				 unsigned long arg) { 	struct snd_timer_user *tu = file->private_data; 	long ret;  	mutex_lock(&tu->ioctl_lock); 	ret = __snd_timer_user_ioctl(file, cmd, arg); 	mutex_unlock(&tu->ioctl_lock); 	return ret; }  static int snd_timer_user_fasync(int fd, struct file * file, int on) { 	struct snd_timer_user *tu;

Patch:
patch: @@ -73,7 +73,7 @@ struct snd_timer_user {
 	struct timespec tstamp;		/* trigger tstamp */
 	wait_queue_head_t qchange_sleep;
 	struct fasync_struct *fasync;
-	struct mutex tread_sem;
+	struct mutex ioctl_lock;
 };
 
 /* list of timers */
@@ -1253,7 +1253,7 @@ static int snd_timer_user_open(struct inode *inode, struct file *file)
 		return -ENOMEM;
 	spin_lock_init(&tu->qlock);
 	init_waitqueue_head(&tu->qchange_sleep);
-	mutex_init(&tu->tread_sem);
+	mutex_init(&tu->ioctl_lock);
 	tu->ticks = 1;
 	tu->queue_size = 128;
 	tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
@@ -1273,8 +1273,10 @@ static int snd_timer_user_release(struct inode *inode, struct file *file)
 	if (file->private_data) {
 		tu = file->private_data;
 		file->private_data = NULL;
+		mutex_lock(&tu->ioctl_lock);
 		if (tu->timeri)
 			snd_timer_close(tu->timeri);
+		mutex_unlock(&tu->ioctl_lock);
 		kfree(tu->queue);
 		kfree(tu->tqueue);
 		kfree(tu);
@@ -1512,7 +1514,6 @@ static int snd_timer_user_tselect(struct file *file,
 	int err = 0;
 
 	tu = file->private_data;
-	mutex_lock(&tu->tread_sem);
 	if (tu->timeri) {
 		snd_timer_close(tu->timeri);
 		tu->timeri = NULL;
@@ -1556,7 +1557,6 @@ static int snd_timer_user_tselect(struct file *file,
 	}
 
       __err:
-      	mutex_unlock(&tu->tread_sem);
 	return err;
 }
 
@@ -1769,7 +1769,7 @@ enum {
 	SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
 };
 
-static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
+static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
 				 unsigned long arg)
 {
 	struct snd_timer_user *tu;
@@ -1786,17 +1786,11 @@ static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
 	{
 		int xarg;
 
-		mutex_lock(&tu->tread_sem);
-		if (tu->timeri)	{	/* too late */
-			mutex_unlock(&tu->tread_sem);
+		if (tu->timeri)	/* too late */
 			return -EBUSY;
-		}
-		if (get_user(xarg, p)) {
-			mutex_unlock(&tu->tread_sem);
+		if (get_user(xarg, p))
 			return -EFAULT;
-		}
 		tu->tread = xarg ? 1 : 0;
-		mutex_unlock(&tu->tread_sem);
 		return 0;
 	}
 	case SNDRV_TIMER_IOCTL_GINFO:
@@ -1829,6 +1823,18 @@ static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
 	return -ENOTTY;
 }
 
+static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
+				 unsigned long arg)
+{
+	struct snd_timer_user *tu = file->private_data;
+	long ret;
+
+	mutex_lock(&tu->ioctl_lock);
+	ret = __snd_timer_user_ioctl(file, cmd, arg);
+	mutex_unlock(&tu->ioctl_lock);
+	return ret;
+}
+
 static int snd_timer_user_fasync(int fd, struct file * file, int on)
 {
 	struct snd_timer_user *tu;
path: sound/core/timer.c