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Merge #7387: Get rid of inaccurate ScriptSigArgsExpected

52b29dc Get rid of inaccurate ScriptSigArgsExpected (Pieter Wuille)
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laanwj committed Jan 22, 2016
2 parents 7726c48 + 52b29dc commit f4b2ce8ee8630789922a14cd9ee9037d96dba1b1
Showing with 6 additions and 70 deletions.
  1. +6 −31 src/policy/policy.cpp
  2. +0 −21 src/script/standard.cpp
  3. +0 −1 src/script/standard.h
  4. +0 −9 src/test/script_P2SH_tests.cpp
  5. +0 −8 src/test/transaction_tests.cpp
View
@@ -135,45 +135,20 @@ bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
const CScript& prevScript = prev.scriptPubKey;
if (!Solver(prevScript, whichType, vSolutions))
return false;
- int nArgsExpected = ScriptSigArgsExpected(whichType, vSolutions);
- if (nArgsExpected < 0)
- return false;
-
- // Transactions with extra stuff in their scriptSigs are
- // non-standard. Note that this EvalScript() call will
- // be quick, because if there are any operations
- // beside "push data" in the scriptSig
- // IsStandardTx() will have already returned false
- // and this method isn't called.
- std::vector<std::vector<unsigned char> > stack;
- if (!EvalScript(stack, tx.vin[i].scriptSig, SCRIPT_VERIFY_NONE, BaseSignatureChecker()))
- return false;
if (whichType == TX_SCRIPTHASH)
{
+ std::vector<std::vector<unsigned char> > stack;
+ // convert the scriptSig into a stack, so we can inspect the redeemScript
+ if (!EvalScript(stack, tx.vin[i].scriptSig, SCRIPT_VERIFY_NONE, BaseSignatureChecker(), 0))
+ return false;
if (stack.empty())
return false;
CScript subscript(stack.back().begin(), stack.back().end());
- std::vector<std::vector<unsigned char> > vSolutions2;
- txnouttype whichType2;
- if (Solver(subscript, whichType2, vSolutions2))
- {
- int tmpExpected = ScriptSigArgsExpected(whichType2, vSolutions2);
- if (tmpExpected < 0)
- return false;
- nArgsExpected += tmpExpected;
- }
- else
- {
- // Any other Script with less than 15 sigops OK:
- unsigned int sigops = subscript.GetSigOpCount(true);
- // ... extra data left on the stack after execution is OK, too:
- return (sigops <= MAX_P2SH_SIGOPS);
+ if (subscript.GetSigOpCount(true) > MAX_P2SH_SIGOPS) {
+ return false;
}
}
-
- if (stack.size() != (unsigned int)nArgsExpected)
- return false;
}
return true;
View
@@ -161,27 +161,6 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsi
return false;
}
-int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions)
-{
- switch (t)
- {
- case TX_NONSTANDARD:
- case TX_NULL_DATA:
- return -1;
- case TX_PUBKEY:
- return 1;
- case TX_PUBKEYHASH:
- return 2;
- case TX_MULTISIG:
- if (vSolutions.size() < 1 || vSolutions[0].size() < 1)
- return -1;
- return vSolutions[0][0] + 1;
- case TX_SCRIPTHASH:
- return 1; // doesn't include args needed by the script
- }
- return -1;
-}
-
bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet)
{
vector<valtype> vSolutions;
View
@@ -71,7 +71,6 @@ typedef boost::variant<CNoDestination, CKeyID, CScriptID> CTxDestination;
const char* GetTxnOutputType(txnouttype t);
bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);
-int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions);
bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);
bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);
@@ -346,15 +346,6 @@ BOOST_AUTO_TEST_CASE(AreInputsStandard)
// 22 P2SH sigops for all inputs (1 for vin[0], 6 for vin[3], 15 for vin[4]
BOOST_CHECK_EQUAL(GetP2SHSigOpCount(txTo, coins), 22U);
- // Make sure adding crap to the scriptSigs makes them non-standard:
- for (int i = 0; i < 3; i++)
- {
- CScript t = txTo.vin[i].scriptSig;
- txTo.vin[i].scriptSig = (CScript() << 11) + t;
- BOOST_CHECK(!::AreInputsStandard(txTo, coins));
- txTo.vin[i].scriptSig = t;
- }
-
CMutableTransaction txToNonStd1;
txToNonStd1.vout.resize(1);
txToNonStd1.vout[0].scriptPubKey = GetScriptForDestination(key[1].GetPubKey().GetID());
@@ -310,14 +310,6 @@ BOOST_AUTO_TEST_CASE(test_Get)
BOOST_CHECK(AreInputsStandard(t1, coins));
BOOST_CHECK_EQUAL(coins.GetValueIn(t1), (50+21+22)*CENT);
-
- // Adding extra junk to the scriptSig should make it non-standard:
- t1.vin[0].scriptSig << OP_11;
- BOOST_CHECK(!AreInputsStandard(t1, coins));
-
- // ... as should not having enough:
- t1.vin[0].scriptSig = CScript();
- BOOST_CHECK(!AreInputsStandard(t1, coins));
}
BOOST_AUTO_TEST_CASE(test_IsStandard)

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