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fuzz: Script validation flags

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This commit is contained in:
MarcoFalke 2019-02-13 14:25:49 -05:00
parent fabcfa5f0c
commit fab15ff70e
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GPG key ID: CE2B75697E69A548
2 changed files with 90 additions and 0 deletions
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18
src/Makefile.test.include
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@ -21,6 +21,7 @@ FUZZ_TARGETS = \
test/fuzz/inv_deserialize \
test/fuzz/messageheader_deserialize \
test/fuzz/netaddr_deserialize \
test/fuzz/script_flags \
test/fuzz/service_deserialize \
test/fuzz/transaction_deserialize \
test/fuzz/txoutcompressor_deserialize \
@ -358,6 +359,23 @@ test_fuzz_netaddr_deserialize_LDADD = \
$(LIBSECP256K1)
test_fuzz_netaddr_deserialize_LDADD += $(BOOST_LIBS) $(CRYPTO_LIBS)
test_fuzz_script_flags_SOURCES = $(FUZZ_SUITE) test/fuzz/script_flags.cpp
test_fuzz_script_flags_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
test_fuzz_script_flags_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
test_fuzz_script_flags_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
test_fuzz_script_flags_LDADD = \
$(LIBUNIVALUE) \
$(LIBBITCOIN_SERVER) \
$(LIBBITCOIN_COMMON) \
$(LIBBITCOIN_UTIL) \
$(LIBBITCOIN_CONSENSUS) \
$(LIBBITCOIN_CRYPTO) \
$(LIBBITCOIN_CRYPTO_SSE41) \
$(LIBBITCOIN_CRYPTO_AVX2) \
$(LIBBITCOIN_CRYPTO_SHANI) \
$(LIBSECP256K1)
test_fuzz_script_flags_LDADD += $(BOOST_LIBS) $(CRYPTO_LIBS)
test_fuzz_service_deserialize_SOURCES = $(FUZZ_SUITE) test/fuzz/deserialize.cpp
test_fuzz_service_deserialize_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) -DSERVICE_DESERIALIZE=1
test_fuzz_service_deserialize_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)

72
src/test/fuzz/script_flags.cpp Normal file
View file

@ -0,0 +1,72 @@
// Copyright (c) 2009-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <script/interpreter.h>
#include <script/script.h>
#include <streams.h>
#include <version.h>
#include <test/fuzz/fuzz.h>
/** Flags that are not forbidden by an assert */
static bool IsValidFlagCombination(unsigned flags);
void test_one_input(std::vector<uint8_t> buffer)
{
CDataStream ds(buffer, SER_NETWORK, INIT_PROTO_VERSION);
try {
int nVersion;
ds >> nVersion;
ds.SetVersion(nVersion);
} catch (const std::ios_base::failure&) {
return;
}
try {
const CTransaction tx(deserialize, ds);
const PrecomputedTransactionData txdata(tx);
unsigned int verify_flags;
ds >> verify_flags;
if (!IsValidFlagCombination(verify_flags)) return;
unsigned int fuzzed_flags;
ds >> fuzzed_flags;
for (unsigned i = 0; i < tx.vin.size(); ++i) {
CTxOut prevout;
ds >> prevout;
const TransactionSignatureChecker checker{&tx, i, prevout.nValue, txdata};
ScriptError serror;
const bool ret = VerifyScript(tx.vin.at(i).scriptSig, prevout.scriptPubKey, &tx.vin.at(i).scriptWitness, verify_flags, checker, &serror);
assert(ret == (serror == SCRIPT_ERR_OK));
// Verify that removing flags from a passing test or adding flags to a failing test does not change the result
if (ret) {
verify_flags &= ~fuzzed_flags;
} else {
verify_flags |= fuzzed_flags;
}
if (!IsValidFlagCombination(verify_flags)) return;
ScriptError serror_fuzzed;
const bool ret_fuzzed = VerifyScript(tx.vin.at(i).scriptSig, prevout.scriptPubKey, &tx.vin.at(i).scriptWitness, verify_flags, checker, &serror_fuzzed);
assert(ret_fuzzed == (serror_fuzzed == SCRIPT_ERR_OK));
assert(ret_fuzzed == ret);
}
} catch (const std::ios_base::failure&) {
return;
}
}
static bool IsValidFlagCombination(unsigned flags)
{
if (flags & SCRIPT_VERIFY_CLEANSTACK && ~flags & (SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS)) return false;
if (flags & SCRIPT_VERIFY_WITNESS && ~flags & SCRIPT_VERIFY_P2SH) return false;
return true;
}