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[libFuzzer] Dump trace and provide correct msg for overwritten input. 

Summary:
Now crashes with a stacktrace and uses 'overwrites-const-input' as the error
message instead of 'out-of-memory'.

Reviewers: morehouse, Dor1s

Reviewed By: morehouse, Dor1s

Subscribers: #sanitizers, llvm-commits, metzman, Dor1s

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D68067

llvm-svn: 373130
This commit is contained in:
Mitch Phillips 2019-09-27 22:04:36 +00:00
parent 8c39d01670
commit d1e222e552
1 changed files with 3 additions and 1 deletions
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4
compiler-rt/lib/fuzzer/FuzzerLoop.cpp
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@ -515,8 +515,10 @@ size_t Fuzzer::GetCurrentUnitInFuzzingThead(const uint8_t **Data) const {
void Fuzzer::CrashOnOverwrittenData() {
Printf("==%d== ERROR: libFuzzer: fuzz target overwrites its const input\n",
GetPid());
PrintStackTrace();
Printf("SUMMARY: libFuzzer: overwrites-const-input\n");
DumpCurrentUnit("crash-");
Printf("SUMMARY: libFuzzer: out-of-memory\n");
PrintFinalStats();
_Exit(Options.ErrorExitCode); // Stop right now.
}