ALSA: seq: 2nd attempt at fixing race creating a queue

commit 4842e98f26dd80be3623c4714a244ba52ea096a8 ("ALSA: seq: Fix race at
creating a queue") attempted to fix a race reported by syzkaller. That
fix has been described as follows:

"
When a sequencer queue is created in snd_seq_queue_alloc(),it adds the
new queue element to the public list before referencing it.  Thus the
queue might be deleted before the call of snd_seq_queue_use(), and it
results in the use-after-free error, as spotted by syzkaller.

The fix is to reference the queue object at the right time.
"

Even with that fix in place, syzkaller reported a use-after-free error.
It specifically pointed to the last instruction "return q->queue" in
snd_seq_queue_alloc(). The pointer q is being used after kfree() has
been called on it.

It turned out that there is still a small window where a race can
happen. The window opens at
snd_seq_ioctl_create_queue()->snd_seq_queue_alloc()->queue_list_add()
and closes at
snd_seq_ioctl_create_queue()->queueptr()->snd_use_lock_use(). Between
these two calls, a different thread could delete the queue and possibly
re-create a different queue in the same location in queue_list.

This change prevents this situation by calling snd_use_lock_use() from
snd_seq_queue_alloc() prior to calling queue_list_add(). It is then the
caller's responsibility to call snd_use_lock_free(&q->use_lock).

Fixes: 4842e98f26dd ("ALSA: seq: Fix race at creating a queue")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Daniel Mentz <danielmentz@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index 272c55fe17c88aec700a7552da4473349c4ce359..ea2d0ae85bd367d5ea70068ee74d925a349789c3 100644 (file)
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -1502,16 +1502,11 @@ static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
 {
        struct snd_seq_queue_info *info = arg;
-       int result;
        struct snd_seq_queue *q;
 
-       result = snd_seq_queue_alloc(client->number, info->locked, info->flags);
-       if (result < 0)
-               return result;
-
-       q = queueptr(result);
-       if (q == NULL)
-               return -EINVAL;
+       q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
+       if (IS_ERR(q))
+               return PTR_ERR(q);
 
        info->queue = q->queue;
        info->locked = q->locked;
@@ -1521,7 +1516,7 @@ static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
        if (!info->name[0])
                snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
        strlcpy(q->name, info->name, sizeof(q->name));
-       queuefree(q);
+       snd_use_lock_free(&q->use_lock);
 
        return 0;
 }

diff --git a/sound/core/seq/seq_queue.c b/sound/core/seq/seq_queue.c
index 450c5187eecb6bb083736d2d2a1aad43b98c7c3f..79e0c5604ef806d62eca084293e66222b8fe6828 100644 (file)
--- a/sound/core/seq/seq_queue.c
+++ b/sound/core/seq/seq_queue.c
@@ -184,22 +184,26 @@ void __exit snd_seq_queues_delete(void)
 static void queue_use(struct snd_seq_queue *queue, int client, int use);
 
 /* allocate a new queue -
- * return queue index value or negative value for error
+ * return pointer to new queue or ERR_PTR(-errno) for error
+ * The new queue's use_lock is set to 1. It is the caller's responsibility to
+ * call snd_use_lock_free(&q->use_lock).
  */
-int snd_seq_queue_alloc(int client, int locked, unsigned int info_flags)
+struct snd_seq_queue *snd_seq_queue_alloc(int client, int locked, unsigned int info_flags)
 {
        struct snd_seq_queue *q;
 
        q = queue_new(client, locked);
        if (q == NULL)
-               return -ENOMEM;
+               return ERR_PTR(-ENOMEM);
        q->info_flags = info_flags;
        queue_use(q, client, 1);
+       snd_use_lock_use(&q->use_lock);
        if (queue_list_add(q) < 0) {
+               snd_use_lock_free(&q->use_lock);
                queue_delete(q);
-               return -ENOMEM;
+               return ERR_PTR(-ENOMEM);
        }
-       return q->queue;
+       return q;
 }
 
 /* delete a queue - queue must be owned by the client */

diff --git a/sound/core/seq/seq_queue.h b/sound/core/seq/seq_queue.h
index 30c8111477f61ed26987dc03abbe9670b36db221..719093489a2c4eec57fed70d4ba2b862cb64a9cf 100644 (file)
--- a/sound/core/seq/seq_queue.h
+++ b/sound/core/seq/seq_queue.h
@@ -71,7 +71,7 @@ void snd_seq_queues_delete(void);
 
 
 /* create new queue (constructor) */
-int snd_seq_queue_alloc(int client, int locked, unsigned int flags);
+struct snd_seq_queue *snd_seq_queue_alloc(int client, int locked, unsigned int flags);
 
 /* delete queue (destructor) */
 int snd_seq_queue_delete(int client, int queueid);