fix(migtd): check event log capacity before RTMR extend - #1027
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haitaohuang wants to merge 1 commit into
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fix(migtd): check event log capacity before RTMR extend#1027haitaohuang wants to merge 1 commit into
haitaohuang wants to merge 1 commit into
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Reject an event that cannot fit in the CCEL buffer before extending the RTMR. This keeps the attested register consistent with its replayable event log when capacity is exhausted. Signed-off-by: Haitao Huang <haitaohuang@microsoft.com> Assisted-by: GitHub Copilot CLI:GPT-5.6-Sol [migtd-review]
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Summary
Check that a complete tagged event record fits in the CCEL buffer before extending the corresponding RTMR.
RTMR extends are irreversible. Extending first and then discovering that the CCEL record cannot be stored leaves remote attestation with an RTMR value that cannot be reproduced from the event log. The new ordering rejects the write before changing the RTMR, preserving RTMR/CCEL consistency.
The scope is limited to the capacity-check ordering in
event_log.rsand a regression test that proves capacity is evaluated before the RTMR path.Validation
cargo fmt --checkcargo test -p migtd --lib event_logmainAzCVMEmu integration matrix