enclave: fix overflow #888
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There is a strange issue with
S3ListKeyswhere, for very long lists of keys (i.e. ~40 KB), the OCall + ECall combination seems to corrupt some enclave state, in a way that SGX'smallocoverwrites some state in the EnclaveWasmModule.In this PR I polish some tangential issues, making this work for relatively long keys (but not aribtrarily long ones). I will address the latter in follow-up PRs.