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771f098a4d
New mutation: InsertRepeatedBytes. Updated mutation: EraseByte => EraseBytes. This helps https://github.com/google/sanitizers/issues/710 where libFuzzer was not able to find a known bug. Now it finds it in minutes. Hopefully, the change is general enough to help other targets. llvm-svn: 278687
30 lines
845 B
C++
30 lines
845 B
C++
// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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// Simple test for a fuzzer. The fuzzer must find repeated bytes.
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#include <assert.h>
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#include <cstdint>
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#include <cstdlib>
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#include <cstddef>
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#include <iostream>
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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assert(Data);
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// Looking for AAAAAAAAAAAAAAAAAAAAAA or some such.
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size_t CurA = 0, MaxA = 0;
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for (size_t i = 0; i < Size; i++) {
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// Make sure there are no conditionals in the loop so that
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// coverage can't help the fuzzer.
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int EQ = Data[i] == 'A';
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CurA = EQ * (CurA + 1);
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int GT = CurA > MaxA;
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MaxA = GT * CurA + (!GT) * MaxA;
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}
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if (MaxA >= 20) {
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std::cout << "BINGO; Found the target (Max: " << MaxA << "), exiting\n";
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exit(0);
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}
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return 0;
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}
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