Merge pull request #2178 from ProofOfKeags/standardness-cleanup

Update standardness rules congruent to Bitcoin Core

mempool/mempool.go

@@ -49,6 +49,10 @@ const (
 	// can be evicted from the mempool when accepting a transaction
 	// replacement.
 	MaxReplacementEvictions = 100
+
+	// Transactions smaller than 65 non-witness bytes are not relayed to
+	// mitigate CVE-2017-12842.
+	MinStandardTxNonWitnessSize = 65
 )
 
 // Tag represents an identifier to use for tagging orphan transactions.  The
@@ -1355,6 +1359,12 @@ func (mp *TxPool) checkMempoolAcceptance(tx *btcutil.Tx,
 		return nil, txRuleError(wire.RejectDuplicate, str)
 	}
 
+	// Disallow transactions under the minimum standardness size.
+	if tx.MsgTx().SerializeSizeStripped() < MinStandardTxNonWitnessSize {
+		str := fmt.Sprintf("tx %v is too small", txHash)
+		return nil, txRuleError(wire.RejectNonstandard, str)
+	}
+
 	// Perform preliminary sanity checks on the transaction. This makes use
 	// of blockchain which contains the invariant rules for what
 	// transactions are allowed into blocks.

txscript/data/tx_invalid.json

@@ -333,6 +333,32 @@
 ["BIP143: wrong sighash (with FindAndDelete) = 17c50ec2181ecdfdc85ca081174b248199ba81fff730794d4f69b8ec031f2dce"],
 [[["9628667ad48219a169b41b020800162287d2c0f713c04157e95c484a8dcb7592", 7500, "0x00 0x20 0x9b66c15b4e0b4eb49fa877982cafded24859fe5b0e2dbfbe4f0df1de7743fd52", 200000]],
 "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", "P2SH,WITNESS"],
+[[["bc7fd132fcf817918334822ee6d9bd95c889099c96e07ca2c1eb2cc70db63224", 0, "CODESEPARATOR 0x21 0x038479a0fa998cd35259a2ef0a7a5c68662c1474f88ccb6d08a7677bbec7f22041 CHECKSIG"]],
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+[[["83e194f90b6ef21fa2e3a365b63794fb5daa844bdc9b25de30899fcfe7b01047", 0, "CODESEPARATOR CODESEPARATOR 0x21 0x038479a0fa998cd35259a2ef0a7a5c68662c1474f88ccb6d08a7677bbec7f22041 CHECKSIG"]],
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+[[["326882a7f22b5191f1a0cc9962ca4b878cd969cf3b3a70887aece4d801a0ba5e", 0, "0x21 0x038479a0fa998cd35259a2ef0a7a5c68662c1474f88ccb6d08a7677bbec7f22041 CODESEPARATOR CHECKSIG"]],
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 ["Make diffs cleaner by leaving a comment here without comma at the end"]
 ]