在 2021/5/17 下午5:55, Xie Yongji 写道:
+
+static int vduse_dev_msg_sync(struct vduse_dev *dev,
+ struct vduse_dev_msg *msg)
+{
+ init_waitqueue_head(&msg->waitq);
+ spin_lock(&dev->msg_lock);
+ vduse_enqueue_msg(&dev->send_list, msg);
+ wake_up(&dev->waitq);
+ spin_unlock(&dev->msg_lock);
+ wait_event_killable(msg->waitq, msg->completed);
What happens if the userspace(malicous) doesn't give a response forever?
It looks like a DOS. If yes, we need to consider a way to fix that.
Thanks
+ spin_lock(&dev->msg_lock);
+ if (!msg->completed) {
+ list_del(&msg->list);
+ msg->resp.result = VDUSE_REQUEST_FAILED;
+ }
+ spin_unlock(&dev->msg_lock);
+
+ return (msg->resp.result == VDUSE_REQUEST_OK) ? 0 : -1;
+}
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