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https://issues.apache.org/jira/browse/ZOOKEEPER-2186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15083051#comment-15083051
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Markus Aalto commented on ZOOKEEPER-2186:
-----------------------------------------
Any considerations regarding this patch if there is a need to add more
information into the InitialMessage in future?
Now with the change it would fail to accept connections from members having
different protocol version, and I see it will be quite difficult (or
impossible) to do rolling upgrades in production systems.
I'm looking at submitting a feature to implement application level keep alive
message on the TCP/IP connection used for Leader Election, which would require
either additional information on the InitialMessage or increasing the protocol
version. Currently doing either of those would break the compatibility.
> QuorumCnxManager#receiveConnection may crash with random input
> --------------------------------------------------------------
>
> Key: ZOOKEEPER-2186
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2186
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.6, 3.5.0
> Reporter: Raul Gutierrez Segales
> Assignee: Raul Gutierrez Segales
> Fix For: 3.4.7, 3.5.1, 3.6.0
>
> Attachments: ZOOKEEPER-2186-v3.4.patch, ZOOKEEPER-2186.patch,
> ZOOKEEPER-2186.patch, ZOOKEEPER-2186.patch
>
>
> This will allocate an arbitrarily large byte buffer (and try to read it!):
> {code}
> public boolean receiveConnection(Socket sock) {
> Long sid = null;
> ...
> sid = din.readLong();
> // next comes the #bytes in the remainder of the message
>
> int num_remaining_bytes = din.readInt();
> byte[] b = new byte[num_remaining_bytes];
> // remove the remainder of the message from din
>
> int num_read = din.read(b);
> {code}
> This will crash the QuorumCnxManager thread, so the cluster will keep going
> but future elections might fail to converge (ditto for leaving/joining
> members).
> Patch coming up in a bit.
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