da2862ef06
If we're consuming an on-disk seed, we usually write out a new one after consuming it. In that case, we might be at early boot and the randomness could be rather poor, and the kernel doesn't guarantee that it'll use the new randomness right away for us. In order to prevent the new entropy from getting any worse, hash together the old seed and the new seed, and replace the final bytes of the new seed with the hash output. This way, entropy strictly increases and never regresses. Fixes: https://github.com/systemd/systemd/issues/21983 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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