[compiler-rt] r311421 - [libFuzzer] fix the stack-depth initialization, add a lit test for DeepRecursionTest.cpp

[Kostya Serebryany via llvm-commits]

Author: kcc
Date: Mon Aug 21 18:50:00 2017
New Revision: 311421

URL: http://llvm.org/viewvc/llvm-project?rev=311421&view=rev
Log:
[libFuzzer] fix the stack-depth initialization, add a lit test for DeepRecursionTest.cpp 

Added:
    compiler-rt/trunk/test/fuzzer/deep-recursion.test
Modified:
    compiler-rt/trunk/lib/fuzzer/FuzzerTracePC.cpp

Modified: compiler-rt/trunk/lib/fuzzer/FuzzerTracePC.cpp
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/fuzzer/FuzzerTracePC.cpp?rev=311421&r1=311420&r2=311421&view=diff
==============================================================================
--- compiler-rt/trunk/lib/fuzzer/FuzzerTracePC.cpp (original)
+++ compiler-rt/trunk/lib/fuzzer/FuzzerTracePC.cpp Mon Aug 21 18:50:00 2017
@@ -343,8 +343,10 @@ void TracePC::ClearInlineCounters() {
   }
 }
 
+ATTRIBUTE_NO_SANITIZE_ALL
 void TracePC::RecordInitialStack() {
-  InitialStack = __sancov_lowest_stack;
+  int stack;
+  __sancov_lowest_stack = InitialStack = reinterpret_cast<uintptr_t>(&stack);
 }
 
 uintptr_t TracePC::GetMaxStackOffset() const {

Added: compiler-rt/trunk/test/fuzzer/deep-recursion.test
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/test/fuzzer/deep-recursion.test?rev=311421&view=auto
==============================================================================
--- compiler-rt/trunk/test/fuzzer/deep-recursion.test (added)
+++ compiler-rt/trunk/test/fuzzer/deep-recursion.test Mon Aug 21 18:50:00 2017
@@ -0,0 +1,4 @@
+# Test that we can find a stack overflow
+RUN: %cpp_compiler -fsanitize-coverage=stack-depth %S/DeepRecursionTest.cpp -o %t
+RUN: not %t -seed=1 -runs=100000000 2>&1 | FileCheck %s
+CHECK: ERROR: libFuzzer: deadly signal