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binder: A Channel might check its SecurityPolicy even after declaring termination

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4/5
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42/100
Issue 类型
缺陷
描述清晰度
需要澄清
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冷清
技术栈
java

调研方向

首先阅读 BinderClientTransport 的 AsyncSecurityPolicy 路径,尤其检查 checkServerAuthorizationAsync()、checkAuthorization()、shutdownNow() 和 transportTerminated() 回调。跟踪提交到 offloadExecutor 的过程以及状态转换,以确定授权是否可能在终止后运行;当生命周期保证得到确立,并由回归测试或明确记录的推理加以覆盖时,即视为完成。

由索引模型根据 Issue 内容生成。

描述

What version of gRPC-Java are you using?

master/HEAD on any version of Android

What did you expect to see?

Some reasoning/guarantee that a Channel will no longer call into its SecurityPolicy after it declares termination.

Steps to reproduce the bug

One of many ways is to call ManagedChannel.shutdownNow() while it's establishing a new connection.

Analysis

When using AsyncSecurityPolicy, BinderClientTransport calls checkServerAuthorizationAsync() while holding its this lock and only after carefully checking that it's not in state SHUTDOWN or SHUTDOWN_TERMINATED. This is safe because clientTransportListener.transportTerminated() is only called after transitioning into those states while holding the same lock. (We do this on the assumption that AsyncSecurityPolicy checks don't block)

However, when using an ordinary blocking SecurityPolicy, checkServerAuthorizationAsync() is implemented by submit()ing this presumably blocking work to offloadExecutor. We first do the same state checks, but because we release the this lock, the transport could shutdown and declare termination after this submission but before the offload executor actually calls checkAuthorization().

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Java
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