Adding method to create process using LowBox token in sandbox code.

base/memory/shared_memory_win.cc

 // Copyright (c) 2011 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.
 
 #include "base/memory/shared_memory.h"
 
 #include <aclapi.h>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 125 matching lines @@
       return false;
 
     // Windows ignores DACLs on certain unnamed objects (like shared sections).
     // So, we generate a random name when we need to enforce read-only.
     uint64_t rand_values[4];
     RandBytes(&rand_values, sizeof(rand_values));
     name_ = StringPrintf(L"CrSharedMem_%016x%016x%016x%016x",
                          rand_values[0], rand_values[1],
                          rand_values[2], rand_values[3]);
   }
+
+  LPCWSTR shared_memory_name = NULL;

[rvargas (doing something else), 2015/02/21 01:01:22]

nit: wchar_t* or char16*

[Shrikant Kelkar, 2015/02/21 02:32:40]

removed, as per second comment.

+  if (!name_.empty())
+    shared_memory_name = name_.c_str();
+
   mapped_file_ = CreateFileMapping(INVALID_HANDLE_VALUE, &sa,
-      PAGE_READWRITE, 0, static_cast<DWORD>(rounded_size), name_.c_str());
+      PAGE_READWRITE, 0, static_cast<DWORD>(rounded_size), shared_memory_name);

[rvargas (doing something else), 2015/02/21 01:01:22]

name_.empty() ? nullptr : name_.c_str() ?
Separate cl?

[Shrikant Kelkar, 2015/02/21 02:32:40]

Done.

   if (!mapped_file_)
     return false;
 
   requested_size_ = options.size;
 
   // Check if the shared memory pre-exists.
   if (GetLastError() == ERROR_ALREADY_EXISTS) {
     // If the file already existed, set requested_size_ to 0 to show that
     // we don't know the size.
     requested_size_ = 0;
@@ skipping 116 matching lines @@
 void SharedMemory::UnlockDeprecated() {
   DCHECK(lock_ != NULL);
   ReleaseMutex(lock_);
 }
 
 SharedMemoryHandle SharedMemory::handle() const {
   return mapped_file_;
 }
 
 }  // namespace base