code for encrypting sensitive tcmalloc metadata

third_party/tcmalloc/chromium/src/tcmalloc.cc

 // Copyright (c) 2005, Google Inc.
 // 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
@@ skipping 107 matching lines @@
 #include <google/malloc_hook.h>         // for MallocHook
 #include "base/basictypes.h"            // for int64
 #include "base/commandlineflags.h"      // for RegisterFlagValidator, etc
 #include "base/dynamic_annotations.h"   // for RunningOnValgrind
 #include "base/spinlock.h"              // for SpinLockHolder
 #include "central_freelist.h"  // for CentralFreeListPadded
 #include "common.h"            // for StackTrace, kPageShift, etc
 #include "free_list.h"         // for FL_Init
 #include "internal_logging.h"  // for ASSERT, TCMalloc_Printer, etc
 #include "malloc_hook-inl.h"       // for MallocHook::InvokeNewHook, etc
+#include "metadata_encode.h"
 #include "page_heap.h"         // for PageHeap, PageHeap::Stats
 #include "page_heap_allocator.h"  // for PageHeapAllocator
 #include "span.h"              // for Span, DLL_Prepend, etc
 #include "stack_trace_table.h"  // for StackTraceTable
 #include "static_vars.h"       // for Static
 #include "system-alloc.h"      // for DumpSystemAllocatorStats, etc
 #include "tcmalloc_guard.h"    // for TCMallocGuard
 #include "thread_cache.h"      // for ThreadCache
 
 // We only need malloc.h for struct mallinfo.
@@ skipping 1788 matching lines @@
   *mark = ~allocated_mark;  //  Distinctively not allocated.
 }
 
 static void MarkAllocatedRegion(void* ptr) {
   if (ptr == NULL) return;
   MarkType* mark = GetMarkLocation(ptr);
   *mark = GetMarkValue(ptr, mark);
 }
 
 #endif  // TCMALLOC_VALIDATION