core/types/bal: check correct rlp encoding size

core/block_validator.go

@@ -49,7 +49,7 @@ func NewBlockValidator(config *params.ChainConfig, blockchain *BlockChain) *Bloc
 // validated at this point.
 func (v *BlockValidator) ValidateBody(block *types.Block) error {
 	// check EIP 7934 RLP-encoded block size cap
-	if v.config.IsOsaka(block.Number(), block.Time()) && block.Size() > params.MaxBlockSize {
+	if v.config.IsOsaka(block.Number(), block.Time()) && block.ConsensusSize() > params.MaxBlockSize {
 		return ErrBlockOversized
 	}
 	// Check whether the block is already imported.

core/types/block.go

@@ -462,6 +462,19 @@ func (b *Block) Size() uint64 {
 	return uint64(c)
 }
 
+// ConsensusSize returns the RLP encoded size of the block without the BAL
+// (block access list), which is not part of the consensus encoding.
+func (b *Block) ConsensusSize() uint64 {
+	c := writeCounter(0)
+	rlp.Encode(&c, &extblock{
+		Header:      b.header,
+		Txs:         b.transactions,
+		Uncles:      b.uncles,
+		Withdrawals: b.withdrawals,
+	})
+	return uint64(c)
+}
+
 // SanityCheck can be used to prevent that unbounded fields are
 // stuffed with junk data to add processing overhead
 func (b *Block) SanityCheck() error {