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# Lambda 事件源映射执行区块示例策略
<a name="security_iam_region_switch_lambda_esm"></a>

 以下是在 Lambda 事件源映射的区域切换计划中添加执行块时要附加的示例策略。

```
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "lambda:GetEventSourceMapping",
        "lambda:UpdateEventSourceMapping"
      ],
      "Resource": "arn:aws:lambda:{{region}}:{{account-id}}:event-source-mapping:{{uuid}}"
    },
    {
      "Effect": "Allow",
      "Action": [
        "lambda:GetFunction"
      ],
      "Resource": "arn:aws:lambda:{{region}}:{{account-id}}:function:{{function-name}}"
    }
  ]
}
```