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limit bit-length of justification bitfield to strict 64, prevent SSZ encoding crash due to too large integer size

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protolambda 2019-04-10 11:14:22 +10:00
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specs/core/0_beacon-chain.md
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@ -1819,6 +1819,8 @@ def update_justification_and_finalization(state: BeaconState) -> None:
# Rotate the justification bitfield up one epoch to make room for the current epoch
state.justification_bitfield <<= 1
# Python var length integers: justification bitfield is 64 bits, and may not be bigger (for SSZ serialization)
state.justification_bitfield &= (1 << 64) - 1
# If the previous epoch gets justified, fill the second last bit
previous_boundary_attesting_balance = get_attesting_balance(state, get_previous_epoch_boundary_attestations(state))
if previous_boundary_attesting_balance * 3 >= get_previous_total_balance(state) * 2: