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consensus/beacon: verify timestamp is greater than parent timestamp (#25236)

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Marius van der Wijden 2022-07-05 09:05:10 +02:00 committed by GitHub
parent 87bb5db675
commit 7217ef4c9c
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1 changed files with 6 additions and 1 deletions
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7
consensus/beacon/consensus.go
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@ -45,6 +45,7 @@ var (
errTooManyUncles = errors.New("too many uncles")
errInvalidNonce = errors.New("invalid nonce")
errInvalidUncleHash = errors.New("invalid uncle hash")
errInvalidTimestamp = errors.New("invalid timestamp")
)
// Beacon is a consensus engine that combines the eth1 consensus and proof-of-stake
@ -213,7 +214,7 @@ func (beacon *Beacon) VerifyUncles(chain consensus.ChainReader, block *types.Blo
// - nonce is expected to be 0
// - unclehash is expected to be Hash(emptyHeader)
// to be the desired constants
// (b) the timestamp is not verified anymore
// (b) we don't verify if a block is in the future anymore
// (c) the extradata is limited to 32 bytes
func (beacon *Beacon) verifyHeader(chain consensus.ChainHeaderReader, header, parent *types.Header) error {
// Ensure that the header's extra-data section is of a reasonable size
@ -227,6 +228,10 @@ func (beacon *Beacon) verifyHeader(chain consensus.ChainHeaderReader, header, pa
if header.UncleHash != types.EmptyUncleHash {
return errInvalidUncleHash
}
// Verify the timestamp
if header.Time <= parent.Time {
return errInvalidTimestamp
}
// Verify the block's difficulty to ensure it's the default constant
if beaconDifficulty.Cmp(header.Difficulty) != 0 {
return fmt.Errorf("invalid difficulty: have %v, want %v", header.Difficulty, beaconDifficulty)