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https://issues.apache.org/jira/browse/IMPALA-13150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Becker resolved IMPALA-13150.
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Resolution: Fixed
> Possible buffer overflow in StringVal::CopyFrom()
> -------------------------------------------------
>
> Key: IMPALA-13150
> URL: https://issues.apache.org/jira/browse/IMPALA-13150
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Daniel Becker
> Assignee: Daniel Becker
> Priority: Major
>
> In {{{}StringVal::CopyFrom(){}}}, we take the 'len' parameter as a
> {{{}size_t{}}}, which is usually a 64-bit unsigned integer. We pass it to the
> constructor of {{{}StringVal{}}}, which takes it as an {{{}int{}}}, which is
> usually a 32-bit signed integer. The constructor then allocates memory for
> the length using the {{int}} value, but back in {{{}CopyFrom(){}}}, we copy
> the buffer with the {{size_t}} length. If {{size_t}} is indeed 64 bits and
> {{int}} is 32 bits, and the value is truncated, we may copy more bytes that
> what we have allocated the destination for. See
> https://github.com/apache/impala/blob/ce8078204e5995277f79e226e26fe8b9eaca408b/be/src/udf/udf.cc#L546
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