From 260ab739694b554c3cdec8531b98e0334753fbe1 Mon Sep 17 00:00:00 2001 From: Gustav Simonsson Date: Wed, 25 Feb 2015 20:00:32 +0100 Subject: [PATCH] Validate block header gas limit * Add block header gas limit validation in ValidateBlock function, see eq 39 and 45 in yellow paper. Before it was calculated _for_ the block instead of validated. * Use the block header gas limit when setting the gas pool instead of calculating the value for the block. --- core/block_processor.go | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/core/block_processor.go b/core/block_processor.go index fd591a29d..f66d158b2 100644 --- a/core/block_processor.go +++ b/core/block_processor.go @@ -62,7 +62,7 @@ func NewBlockProcessor(db ethutil.Database, txpool *TxPool, chainManager *ChainM func (sm *BlockProcessor) TransitionState(statedb *state.StateDB, parent, block *types.Block, transientProcess bool) (receipts types.Receipts, err error) { coinbase := statedb.GetOrNewStateObject(block.Header().Coinbase) - coinbase.SetGasPool(CalcGasLimit(parent, block)) + coinbase.SetGasPool(block.Header().GasLimit) // Process the transactions on to parent state receipts, _, _, _, err = sm.ApplyTransactions(coinbase, statedb, block, block.Transactions(), transientProcess) @@ -247,6 +247,11 @@ func (sm *BlockProcessor) ValidateBlock(block, parent *types.Block) error { return fmt.Errorf("Difficulty check failed for block %v, %v", block.Header().Difficulty, expd) } + expl := CalcGasLimit(parent, block) + if expl.Cmp(block.Header().GasLimit) != 0 { + return fmt.Errorf("GasLimit check failed for block %v, %v", block.Header().GasLimit, expl) + } + if block.Time() < parent.Time() { return ValidationError("Block timestamp not after prev block (%v - %v)", block.Header().Time, parent.Header().Time) }