Manually randomize the memory addresses for regions of JIT code in the Large ...

src/platform.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 264 matching lines @@
 
   // Returns the activation frame alignment constraint or zero if
   // the platform doesn't care. Guaranteed to be a power of two.
   static int ActivationFrameAlignment();
 
   static void ReleaseStore(volatile AtomicWord* ptr, AtomicWord value);
 
  private:
   static const int msPerSecond = 1000;
 
+  // The address range used to randomize RWX allocations in OS::Allocate
+  // Try not to map pages into the default range that windows loads DLLs
+  // Note: This does not guarantee RWX regions will be within the
+  // range kAllocationRandomAddressMin to kAllocationRandomAddressMax
+#ifdef V8_HOST_ARCH_64_BIT
+  static const intptr_t kAllocationRandomAddressMin = 0x0000000080000000;
+  static const intptr_t kAllocationRandomAddressMax = 0x000004FFFFFFFFFF;
+#else
+  static const intptr_t kAllocationRandomAddressMin = 0x04000000;
+  static const intptr_t kAllocationRandomAddressMax = 0x4FFFFFFF;
+#endif
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(OS);
 };
 
 
 class VirtualMemory {
  public:
   // Reserves virtual memory with size.
   explicit VirtualMemory(size_t size);
   ~VirtualMemory();
 
@@ skipping 273 matching lines @@
   bool active_;
   PlatformData* data_;  // Platform specific data.
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
 };
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_