Don't allow path traversal paths on the base file helpers

base/platform_file_win.cc

 // 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.
 
 #include "base/platform_file.h"
 
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/threading/thread_restrictions.h"
 
 namespace base {
-
-PlatformFile CreatePlatformFile(const FilePath& name,
-                                int flags,
-                                bool* created,
-                                PlatformFileError* error_code) {
+PlatformFile CreatePlatformFileAllowTraversal(const FilePath& name,
+                                              int flags,
+                                              bool* created,
+                                              PlatformFileError* error_code) {
   base::ThreadRestrictions::AssertIOAllowed();
 
   DWORD disposition = 0;
   if (created)
     *created = false;
 
   if (flags & PLATFORM_FILE_OPEN)
     disposition = OPEN_EXISTING;
 
   if (flags & PLATFORM_FILE_CREATE) {
@@ skipping 227 matching lines @@
   info->is_directory =
       (file_info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
   info->is_symbolic_link = false; // Windows doesn't have symbolic links.
   info->last_modified = base::Time::FromFileTime(file_info.ftLastWriteTime);
   info->last_accessed = base::Time::FromFileTime(file_info.ftLastAccessTime);
   info->creation_time = base::Time::FromFileTime(file_info.ftCreationTime);
   return true;
 }
 
 }  // namespace base