[SyzyAsan] Disable registry filter for sandboxed processes.

syzygy/agent/asan/registry_cache.cc

 // Copyright 2015 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 41 matching lines @@
                              size_t max_versions)
     : max_days_in_registry_(max_days_in_registry),
       max_entries_per_version_(max_entries_per_version),
       max_modules_(max_modules),
       max_versions_(max_versions),
       registry_cache_key_(kRegistryBaseKey),
       is_init_(false) {
   registry_cache_key_.append(registry_name);
 }
 
+// static
+bool RegistryCache::RegistryAvailable() {
+  base::win::RegKey test_key(kRegistryRootKey, L"SYSTEM", KEY_ALL_ACCESS);
+  if (!test_key.Valid())
+    return false;
+  test_key.Close();
+  return true;
+}
+
 bool RegistryCache::Init() {
+  DCHECK(RegistryAvailable());
+
   // Always start by cleaning up the values, to limit the size of entries in
   // the registry.
   CleanUp();
   // We can fail if we are not able to initialize the module information.
   is_init_ = InitModuleInfo();
   if (!is_init_)
     return false;
   LoadEntries();
   return true;
 }
@@ skipping 205 matching lines @@
   for (RegValueIter iter(kRegistryRootKey, module_key_name_.c_str());
        iter.Valid(); ++iter) {
     DCHECK_EQ(sizeof(StackId), iter.ValueSize());
     const StackId* ptr_value = reinterpret_cast<const StackId*>(iter.Value());
     entries_.insert(*ptr_value);
   }
 }
 
 }  // namespace asan
 }  // namespace agent