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Fix false positive caused by early termination due to nested expressions.

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This commit is contained in:
Bhargava Shastry 2021-03-26 13:21:33 +01:00
parent d75a132f33
commit f3f1ccc34f
4 changed files with 19 additions and 11 deletions
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5
test/tools/ossfuzz/strictasm_diff_ossfuzz.cpp
View File

@ -86,7 +86,7 @@ extern "C" int LLVMFuzzerTestOneInput(uint8_t const* _data, size_t _size)
stack.parserResult()->code,
EVMDialect::strictAssemblyForEVMObjects(langutil::EVMVersion())
);
if (termReason == yulFuzzerUtil::TerminationReason::StepLimitReached)
if (yulFuzzerUtil::resourceLimitsExceeded(termReason))
return 0;
stack.optimize();
@ -97,6 +97,9 @@ extern "C" int LLVMFuzzerTestOneInput(uint8_t const* _data, size_t _size)
(yul::test::yul_fuzzer::yulFuzzerUtil::maxSteps * 4)
);
if (yulFuzzerUtil::resourceLimitsExceeded(termReason))
return 0;
bool isTraceEq = (os1.str() == os2.str());
yulAssert(isTraceEq, "Interpreted traces for optimized and unoptimized code differ.");
return 0;

8
test/tools/ossfuzz/yulFuzzerCommon.cpp
View File

@ -73,3 +73,11 @@ yulFuzzerUtil::TerminationReason yulFuzzerUtil::interpret(
state.dumpTraceAndState(_os);
return reason;
}
bool yulFuzzerUtil::resourceLimitsExceeded(TerminationReason _reason)
{
return
_reason == yulFuzzerUtil::TerminationReason::StepLimitReached ||
_reason == yulFuzzerUtil::TerminationReason::TraceLimitReached ||
_reason == yulFuzzerUtil::TerminationReason::ExpresionNestingLimitReached;
}

5
test/tools/ossfuzz/yulFuzzerCommon.h
View File

@ -40,6 +40,11 @@ struct yulFuzzerUtil
size_t _maxTraceSize = maxTraceSize,
size_t _maxExprNesting = maxExprNesting
);
/// @returns true if @param _reason for Yul interpreter terminating is
/// resource exhaustion of some form e.g., exceeded maximum time-out
/// threshold, number of nested expressions etc.
static bool resourceLimitsExceeded(TerminationReason _reason);
static size_t constexpr maxSteps = 100;
static size_t constexpr maxTraceSize = 75;
static size_t constexpr maxExprNesting = 64;

12
test/tools/ossfuzz/yulProto_diff_ossfuzz.cpp
View File

@ -100,11 +100,7 @@ DEFINE_PROTO_FUZZER(Program const& _input)
EVMDialect::strictAssemblyForEVMObjects(version)
);
if (
termReason == yulFuzzerUtil::TerminationReason::StepLimitReached ||
termReason == yulFuzzerUtil::TerminationReason::TraceLimitReached ||
termReason == yulFuzzerUtil::TerminationReason::ExpresionNestingLimitReached
)
if (yulFuzzerUtil::resourceLimitsExceeded(termReason))
return;
YulOptimizerTestCommon optimizerTest(
@ -119,11 +115,7 @@ DEFINE_PROTO_FUZZER(Program const& _input)
astBlock,
EVMDialect::strictAssemblyForEVMObjects(version)
);
if (
termReason == yulFuzzerUtil::TerminationReason::StepLimitReached ||
termReason == yulFuzzerUtil::TerminationReason::TraceLimitReached ||
termReason == yulFuzzerUtil::TerminationReason::ExpresionNestingLimitReached
)
if (yulFuzzerUtil::resourceLimitsExceeded(termReason))
return;
bool isTraceEq = (os1.str() == os2.str());