[pull] master from cube-js:master - #619
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Validate every frontend message length before allocating, instead of trusting the client-supplied frame length: * **Startup packet** (incl. SSLRequest/GSSENC/CancelRequest): capped at 10 KiB, in line with PostgreSQL's `MAX_STARTUP_PACKET_LENGTH`. Oversized frames are rejected with a protocol error before any allocation. * **Authentication response** (e.g. the password message, read before the session is authenticated): capped at 64 KiB. PostgreSQL uses `PQ_SMALL_MESSAGE_LIMIT` (10,000 bytes) here, but CubeSQL accepts JWTs as passwords, which need more headroom. * **Messages on authenticated connections**: capped at 16 MiB. PostgreSQL allows ~1 GiB (`PQ_LARGE_MESSAGE_LIMIT`), but CubeSQL has no COPY/bulk-ingestion path — the largest legitimate payloads are query texts (Query/Parse) and Bind parameters, and 10 MiB comfortably covers machine-generated SQL from BI tools.
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