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From "sumit agrawal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2977) Concurrency for addAuth corrupts quorum packets
Date Mon, 26 Feb 2018 15:58:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16377075#comment-16377075
] 

sumit agrawal commented on ZOOKEEPER-2977:
------------------------------------------

https://github.com/apache/zookeeper/pull/474

> Concurrency for addAuth corrupts quorum packets
> -----------------------------------------------
>
>                 Key: ZOOKEEPER-2977
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2977
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: quorum
>    Affects Versions: 3.4.9
>         Environment: Affects all version in 3.4.x
>            Reporter: sumit agrawal
>            Priority: Critical
>             Fix For: 3.4.12
>
>         Attachments: 2977.patch
>
>
> When client performs multiple times addAuth with different credential at follower concurrently,
the communication between follower gets corrupt. This causes shutdown of Follower due to the
failure.
> Analysis:
> In org.apache.zookeeper.server.quorum.QuorumPacket.serialize method,
>  * call a_.startVector(authinfo,"authinfo"); which write the length of authinfo to packet
(suppose it writes length 1)
>  * get length of authinfo to write all details in loop (here gets length as 2)
> <-- Here in concurrency scenario, buffer gets corrupt having extra bytes in channel
for additional authinfo.
>  
> So When Leader reads next quorum packet, it reads previous extra bytes (incorrect) and
possibly identify greater size of message (as corrupt byte pattern) causes exception...
> Coordination > Unexpected exception causing shutdown while sock still open (LearnerHandler.java:633)
>  java.io.IOException: Unreasonable length = 1885430131
>  
>  
> ServerCnxn.getAuthInfo returns Unmodifiable list, but while addAuthInfo, there is no
check. So this causes concurrency issue.
>  
>  
>  
>  



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