diff options
Diffstat (limited to 'llvm/lib/Fuzzer/FuzzerTracePC.cpp')
| -rw-r--r-- | llvm/lib/Fuzzer/FuzzerTracePC.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/Fuzzer/FuzzerTracePC.cpp b/llvm/lib/Fuzzer/FuzzerTracePC.cpp index 53454371f3e..91a9746e729 100644 --- a/llvm/lib/Fuzzer/FuzzerTracePC.cpp +++ b/llvm/lib/Fuzzer/FuzzerTracePC.cpp @@ -214,9 +214,12 @@ void TracePC::AddValueForMemcmp(void *caller_pc, const void *s1, const void *s2, uint8_t B2[Word::kMaxSize]; // Copy the data into locals in this non-msan-instrumented function // to avoid msan complaining further. + size_t Hash = 0; // Compute some simple hash of both strings. for (size_t i = 0; i < Len; i++) { B1[i] = A1[i]; B2[i] = A2[i]; + size_t T = B1[i]; + Hash ^= (T << 8) | B2[i]; } size_t I = 0; for (; I < Len; I++) @@ -225,7 +228,7 @@ void TracePC::AddValueForMemcmp(void *caller_pc, const void *s1, const void *s2, size_t PC = reinterpret_cast<size_t>(caller_pc); size_t Idx = (PC & 4095) | (I << 12); TPC.HandleValueProfile(Idx); - TORCW.Insert(Idx, Word(B1, Len), Word(B2, Len)); + TORCW.Insert(Idx ^ Hash, Word(B1, Len), Word(B2, Len)); } template <class T> |
