[sanitizer] enable random shuffling the memory chunks inside the allocator, under a flag. Set this flag for the scudo allocator, add a test.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@279793 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/scudo/scudo_allocator.cpp b/lib/scudo/scudo_allocator.cpp
index b5d8fc8bf..d5284a53e 100644
--- a/lib/scudo/scudo_allocator.cpp
+++ b/lib/scudo/scudo_allocator.cpp
@@ -38,6 +38,8 @@ struct AP {
   static const uptr kMetadataSize = 0;
   typedef DefaultSizeClassMap SizeClassMap;
   typedef NoOpMapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags =
+      SizeClassAllocator64FlagMasks::kRandomShuffleChunks;
 };
 
 typedef SizeClassAllocator64<AP> PrimaryAllocator;