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https://issues.apache.org/jira/browse/KUDU-2305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16393792#comment-16393792
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Joe McDonnell commented on KUDU-2305:
-------------------------------------
Other thought:
InboundCall::AddOutboundSidecar()/RpcController::AddOutboundSidecar() already
return Status and are used to construct the list of sidecars. If those would
fail when the total size of the sidecars reaches INT_MAX, then we would never
even get to
OutboundCall::SetRequestPayload()/InboundCall::SerializeResponseBuffer().
Essentially, no one could construct a message that is too big. We already limit
the total number of sidecars. It makes sense to limit the total size of the
sidecars.
> Local variables can overflow when serializing a 2GB message
> -----------------------------------------------------------
>
> Key: KUDU-2305
> URL: https://issues.apache.org/jira/browse/KUDU-2305
> Project: Kudu
> Issue Type: Bug
> Components: rpc
> Affects Versions: 1.6.0
> Reporter: Joe McDonnell
> Assignee: Joe McDonnell
> Priority: Major
> Fix For: 1.7.0
>
>
> When rpc_max_message_size is set to its maximum of INT_MAX (2147483647),
> certain local variables in SerializeMessage can overflow as messages approach
> this size. Specifically, recorded_size, size_with_delim, and total_size are 4
> byte signed integers and could overflow when additional_size becomes large.
> Since INT_MAX is the largest allowable value for rpc_max_message_size (a 4
> byte signed integer), these variables will not overflow if changed to 4 byte
> unsigned integers. This would eliminate the potential problem for
> serialization.
> A similar problem exists in the InboundTransfer::ReceiveBuffer() and similar
> codepaths. Changing those variables to unsigned integers should resolve the
> issue.
> This does not impact existing systems, because the default value of
> rpc_max_message_size is 50MB.
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