From: Kostya Serebryany <kcc@google.com>
Date: Wed, 5 Aug 2015 23:02:57 +0000 (+0000)
Subject: [libFuzzer] in dfsan mode, set labels every time we start recording traces as opposed... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5707219e9494f14a01ad0ddf0e55a91af1723f7a;p=oota-llvm.git

[libFuzzer] in dfsan mode, set labels every time we start recording traces as opposed to doing it at process startup. This ensures that the labels are fresh.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244165 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Fuzzer/FuzzerTraceState.cpp b/lib/Fuzzer/FuzzerTraceState.cpp
index 13635a70d76..c6f7c9e5a95 100644
--- a/lib/Fuzzer/FuzzerTraceState.cpp
+++ b/lib/Fuzzer/FuzzerTraceState.cpp
@@ -394,6 +394,9 @@ static TraceState *TS;
 
 void Fuzzer::StartTraceRecording() {
   if (!TS) return;
+  if (ReallyHaveDFSan())
+    for (size_t i = 0; i < static_cast<size_t>(Options.MaxLen); i++)
+      dfsan_set_label(i + 1, &CurrentUnit[i], 1);
   TS->StartTraceRecording();
 }
 
@@ -417,7 +420,6 @@ void Fuzzer::InitializeTraceState() {
     dfsan_label L = dfsan_create_label("input", (void*)(i + 1));
     // We assume that no one else has called dfsan_create_label before.
     assert(L == i + 1);
-    dfsan_set_label(L, &CurrentUnit[i], 1);
   }
 }