Commit 7e1d90f6 authored by Daniel Mentz's avatar Daniel Mentz Committed by Takashi Iwai

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

commit 4842e98f ("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: 4842e98f ("ALSA: seq: Fix race at creating a queue")
Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarDaniel Mentz <danielmentz@google.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 8df4b003
......@@ -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;
}
......
......@@ -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 */
......
......@@ -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);
......
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