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Merge pull request #5000

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0391423 Discourage NOPs reserved for soft-fork upgrades (Peter Todd)
This commit is contained in:
Pieter Wuille 2014-11-20 15:23:05 +01:00
commit 3ba5ebc065
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GPG Key ID: 57896D2FF8F0B657
8 changed files with 49 additions and 3 deletions
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6
src/script/interpreter.cpp
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@ -329,8 +329,14 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, un
// Control
//
case OP_NOP:
break;
case OP_NOP1: case OP_NOP2: case OP_NOP3: case OP_NOP4: case OP_NOP5:
case OP_NOP6: case OP_NOP7: case OP_NOP8: case OP_NOP9: case OP_NOP10:
{
if (flags & SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS)
return set_error(serror, SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS);
}
break;
case OP_IF:

13
src/script/interpreter.h
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@ -57,7 +57,18 @@ enum
// any other push causes the script to fail (BIP62 rule 3).
// In addition, whenever a stack element is interpreted as a number, it must be of minimal length (BIP62 rule 4).
// (softfork safe)
SCRIPT_VERIFY_MINIMALDATA = (1U << 6)
SCRIPT_VERIFY_MINIMALDATA = (1U << 6),
// Discourage use of NOPs reserved for upgrades (NOP1-10)
//
// Provided so that nodes can avoid accepting or mining transactions
// containing executed NOP's whose meaning may change after a soft-fork,
// thus rendering the script invalid; with this flag set executing
// discouraged NOPs fails the script. This verification flag will never be
// a mandatory flag applied to scripts in a block. NOPs that are not
// executed, e.g. within an unexecuted IF ENDIF block, are *not* rejected.
SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS = (1U << 7)
};
uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);

2
src/script/script_error.cpp
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@ -59,6 +59,8 @@ const char* ScriptErrorString(const ScriptError serror)
return "Non-canonical signature: S value is unnecessarily high";
case SCRIPT_ERR_SIG_NULLDUMMY:
return "Dummy CHECKMULTISIG argument must be zero";
case SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS:
return "NOPx reserved for soft-fork upgrades";
case SCRIPT_ERR_UNKNOWN_ERROR:
case SCRIPT_ERR_ERROR_COUNT:
default: break;

3
src/script/script_error.h
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@ -43,6 +43,9 @@ typedef enum ScriptError_t
SCRIPT_ERR_SIG_HIGH_S,
SCRIPT_ERR_SIG_NULLDUMMY,
/* softfork safeness */
SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS,
SCRIPT_ERR_ERROR_COUNT
} ScriptError;

3
src/script/standard.h
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@ -47,7 +47,8 @@ static const unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH;
static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
SCRIPT_VERIFY_STRICTENC |
SCRIPT_VERIFY_MINIMALDATA |
SCRIPT_VERIFY_NULLDUMMY;
SCRIPT_VERIFY_NULLDUMMY |
SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS;
/** For convenience, standard but not mandatory verify flags. */
static const unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;

17
src/test/data/script_invalid.json
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@ -163,6 +163,23 @@ nSequences are max.
["1","NOP1 NOP2 NOP3 NOP4 NOP5 NOP6 NOP7 NOP8 NOP9 NOP10 2 EQUAL", "P2SH,STRICTENC"],
["'NOP_1_to_10' NOP1 NOP2 NOP3 NOP4 NOP5 NOP6 NOP7 NOP8 NOP9 NOP10","'NOP_1_to_11' EQUAL", "P2SH,STRICTENC"],
["Ensure 100% coverage of discouraged NOPS"],
["1", "NOP1", "P2SH,DISCOURAGE_UPGRADABLE_NOPS"],
["1", "NOP2", "P2SH,DISCOURAGE_UPGRADABLE_NOPS"],
["1", "NOP3", "P2SH,DISCOURAGE_UPGRADABLE_NOPS"],
["1", "NOP4", "P2SH,DISCOURAGE_UPGRADABLE_NOPS"],
["1", "NOP5", "P2SH,DISCOURAGE_UPGRADABLE_NOPS"],
["1", "NOP6", "P2SH,DISCOURAGE_UPGRADABLE_NOPS"],
["1", "NOP7", "P2SH,DISCOURAGE_UPGRADABLE_NOPS"],
["1", "NOP8", "P2SH,DISCOURAGE_UPGRADABLE_NOPS"],
["1", "NOP9", "P2SH,DISCOURAGE_UPGRADABLE_NOPS"],
["1", "NOP10", "P2SH,DISCOURAGE_UPGRADABLE_NOPS"],
["NOP10", "1", "P2SH,DISCOURAGE_UPGRADABLE_NOPS", "Discouraged NOP10 in scriptSig"],
["1 0x01 0xb9", "HASH160 0x14 0x15727299b05b45fdaf9ac9ecf7565cfe27c3e567 EQUAL",
"P2SH,DISCOURAGE_UPGRADABLE_NOPS", "Discouraged NOP10 in redeemScript"],
["0x50","1", "P2SH,STRICTENC", "opcode 0x50 is reserved"],
["1", "IF 0xba ELSE 1 ENDIF", "P2SH,STRICTENC", "opcodes above NOP10 invalid if executed"],
["1", "IF 0xbb ELSE 1 ENDIF", "P2SH,STRICTENC"],

5
src/test/data/script_valid.json
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@ -235,6 +235,11 @@ nSequences are max.
["1","NOP1 NOP2 NOP3 NOP4 NOP5 NOP6 NOP7 NOP8 NOP9 NOP10 1 EQUAL", "P2SH,STRICTENC"],
["'NOP_1_to_10' NOP1 NOP2 NOP3 NOP4 NOP5 NOP6 NOP7 NOP8 NOP9 NOP10","'NOP_1_to_10' EQUAL", "P2SH,STRICTENC"],
["1", "NOP", "P2SH,STRICTENC,DISCOURAGE_UPGRADABLE_NOPS", "Discourage NOPx flag allows OP_NOP"],
["0", "IF NOP10 ENDIF 1", "P2SH,STRICTENC,DISCOURAGE_UPGRADABLE_NOPS",
"Discouraged NOPs are allowed if not executed"],
["0", "IF 0xba ELSE 1 ENDIF", "P2SH,STRICTENC", "opcodes above NOP10 invalid if executed"],
["0", "IF 0xbb ELSE 1 ENDIF", "P2SH,STRICTENC"],
["0", "IF 0xbc ELSE 1 ENDIF", "P2SH,STRICTENC"],

3
src/test/transaction_tests.cpp
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@ -37,7 +37,8 @@ static std::map<string, unsigned int> mapFlagNames = boost::assign::map_list_of
(string("LOW_S"), (unsigned int)SCRIPT_VERIFY_LOW_S)
(string("SIGPUSHONLY"), (unsigned int)SCRIPT_VERIFY_SIGPUSHONLY)
(string("MINIMALDATA"), (unsigned int)SCRIPT_VERIFY_MINIMALDATA)
(string("NULLDUMMY"), (unsigned int)SCRIPT_VERIFY_NULLDUMMY);
(string("NULLDUMMY"), (unsigned int)SCRIPT_VERIFY_NULLDUMMY)
(string("DISCOURAGE_UPGRADABLE_NOPS"), (unsigned int)SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS);
unsigned int ParseScriptFlags(string strFlags)
{