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Merge bitcoin/bitcoin#28207: mempool: Persist with XOR

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fa6b053b5c mempool: persist with XOR (MarcoFalke)

Pull request description:

  Currently the `mempool.dat` file stores data received from remote peers as-is. This may be problematic when a program other than Bitcoin Core tries to interpret them by accident. For example, an anti-virus program or other program may scan the file and move it into quarantine, or delete it, or corrupt it.

  While the local wallet is expected to re-submit any pending transactions, unrelated transactions may be missing from the mempool after a restart. This may cause fee estimates to be off, or may cause block relay to be slower.

  Fix this, similar to https://github.com/bitcoin/bitcoin/pull/6650, by rolling a random XOR pattern over the dat file when writing or reading it.

  Obviously this can only protect against programs that accidentally and unintentionally are trying to mess with the dat file. Any program that intentionally wants to mess with the dat file can still trivially do so.

ACKs for top commit:
  achow101:
    re-ACK fa6b053b5c
  glozow:
    reACK fa6b053b5c
  ismaelsadeeq:
    ACK fa6b053b5c

Tree-SHA512: ded2ce3d81bc944b828263534e3178a1e45a914fe8e024f4a14c6561a73e301820944ecc75dd704b3d4221a7a3a5c0597ccab79546250c1197609ee981fe324e
This commit is contained in:
Andrew Chow
2023-11-13 11:17:02 -05:00
parent 6342348072 fa6b053b5c
commit d232e36abd
9 changed files with 49 additions and 15 deletions
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doc/release-notes-28207.md Normal file
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mempool.dat compatibility
========================
The `mempool.dat` file created by -persistmempool or the savemempool RPC will
be written in a new format, which can not be read by previous software
releases. To allow for a downgrade, a temporary setting `-persistmempoolv1` has
been added to fall back to the legacy format.