Felix Dörre
e375bc5fcc
Currently empty epochs are not sealed. This allows an attacker to truncate a sealed log and continue it without any problems showing when verifying the log. This partially addresses CVE-2023-31438. One way to extend this change to address CVE-2023-31438 completely, would be to verify that there is exactly one seal per epoch (and not sealing when the epoch has not ended yet). the change also adds a journal-file flag: HEADER_COMPATIBLE_SEALED_CONTINUOUS this flag indicates that a journal file is sealed continuously and decides whether any missing crypto epochs should trigger a warning or an error.
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