Sandbox: Fix the memory protection code to handle page boundaries....

sandbox/src/sandbox_nt_util.cc

 // Copyright (c) 2006-2010 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 "sandbox/src/sandbox_nt_util.h"
 
 #include "base/win/pe_image.h"
 #include "sandbox/src/sandbox_factory.h"
 #include "sandbox/src/target_services.h"
 
@@ skipping 455 matching lines @@
 
 NTSTATUS AutoProtectMemory::ChangeProtection(void* address, size_t bytes,
                                              ULONG protect) {
   DCHECK_NT(!changed_);
   SIZE_T new_bytes = bytes;
   NTSTATUS ret = g_nt.ProtectVirtualMemory(NtCurrentProcess, &address,
                                            &new_bytes, protect, &old_protect_);
   if (NT_SUCCESS(ret)) {
     changed_ = true;
     address_ = address;
-    bytes_ = bytes;
+    bytes_ = new_bytes;
   }
 
   return ret;
 }
 
 NTSTATUS AutoProtectMemory::RevertProtection() {
   if (!changed_)
     return STATUS_SUCCESS;
 
   DCHECK_NT(address_);
@@ skipping 90 matching lines @@
   UNREFERENCED_PARAMETER(type);
   return buffer;
 }
 
 void __cdecl operator delete(void* memory, void* buffer,
                              sandbox::AllocationType type) {
   UNREFERENCED_PARAMETER(memory);
   UNREFERENCED_PARAMETER(buffer);
   UNREFERENCED_PARAMETER(type);
 }