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Merge pull request from GHSA-mg2p-657r-46cj
* Fix size-and-allocate OCALLs - Enclave functions that make two OCALLs to size and allocate enclave buffers which are then returned to host can leak enclave heap information if the enclave is provided a larger size than necessary, then copies the larger size out to host. - Functions that do this now require that the initial size matches the written data size before information based on that buffer size are copied back to host. * Update SECURITY.md
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