static int binder_ioctl_set_ctx_mgr(struct file *filp)
{
	int ret = 0;
	struct binder_proc *proc = filp->private_data;
	struct binder_context *context = proc->context;
	struct binder_node *new_node;
	kuid_t curr_euid = current_euid();

	mutex_lock(&context->context_mgr_node_lock);
	if (context->binder_context_mgr_node) {
		pr_err("BINDER_SET_CONTEXT_MGR already set\n");
		ret = -EBUSY;
		goto out;
	}
	ret = security_binder_set_context_mgr(proc->tsk);
	if (ret < 0)
		goto out;
	if (uid_valid(context->binder_context_mgr_uid)) {
		if (!uid_eq(context->binder_context_mgr_uid, curr_euid)) {
			pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
			       from_kuid(&init_user_ns, curr_euid),
			       from_kuid(&init_user_ns,
					 context->binder_context_mgr_uid));
			ret = -EPERM;
			goto out;
		}
	} else {
		context->binder_context_mgr_uid = curr_euid;
	}
	new_node = binder_new_node(proc, NULL);
	if (!new_node) {
		ret = -ENOMEM;
		goto out;
	}
	binder_node_lock(new_node);
	new_node->local_weak_refs++;
	new_node->local_strong_refs++;
	new_node->has_strong_ref = 1;
	new_node->has_weak_ref = 1;
	context->binder_context_mgr_node = new_node;
	binder_node_unlock(new_node);
	binder_put_node(new_node);
out:
	mutex_unlock(&context->context_mgr_node_lock);
	return ret;
}
Unknown