Added protection against mapping image sections between processes.

base/memory/shared_memory.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MEMORY_SHARED_MEMORY_H_
 #define BASE_MEMORY_SHARED_MEMORY_H_
 
 #include "build/build_config.h"
 
 #include <string>
@@ skipping 264 matching lines @@
   enum ShareMode {
     SHARE_READONLY,
     SHARE_CURRENT_MODE,
   };
   bool ShareToProcessCommon(ProcessHandle process,
                             SharedMemoryHandle* new_handle,
                             bool close_self,
                             ShareMode);
 
 #if defined(OS_WIN)
+  // If true indicates this came from an external source so needs extra checks
+  // before being mapped.
+  bool external_section_;
   std::wstring       name_;
   HANDLE             mapped_file_;
 #elif defined(OS_MACOSX) && !defined(OS_IOS)
   // The OS primitive that backs the shared memory region.
   SharedMemoryHandle shm_;
 
   // The mechanism by which the memory is mapped. Only valid if |memory_| is not
   // |nullptr|.
   SharedMemoryHandle::Type mapped_memory_mechanism_;
 
   int readonly_mapped_file_;
 #elif defined(OS_POSIX)
   int                mapped_file_;
   int                readonly_mapped_file_;
 #endif
   size_t             mapped_size_;
   void*              memory_;
   bool               read_only_;
   size_t             requested_size_;
 
   DISALLOW_COPY_AND_ASSIGN(SharedMemory);
 };
 }  // namespace base
 
 #endif  // BASE_MEMORY_SHARED_MEMORY_H_