Make SyzyAsan support the allocation > 1GB

syzygy/agent/asan/block.cc

 // Copyright 2014 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 221 matching lines @@
                      uint32_t size,
                      uint32_t min_left_redzone_size,
                      uint32_t min_right_redzone_size,
                      BlockLayout* layout) {
   DCHECK_LE(kShadowRatio, chunk_size);
   DCHECK(::common::IsPowerOfTwo(chunk_size));
   DCHECK_LE(kShadowRatio, alignment);
   DCHECK_GE(chunk_size, alignment);
   DCHECK(::common::IsPowerOfTwo(alignment));
 
+  // Prevent from trying to allocate a memory block bigger than what we can
+  // represent in the block header.
+  if (size > kMaxBlockHeaderBodySize)
+    return false;
+
   // Calculate minimum redzone sizes that respect the parameters.
   uint32_t left_redzone_size = static_cast<uint32_t>(::common::AlignUp(
       std::max<uint32_t>(min_left_redzone_size, sizeof(BlockHeader)),
       alignment));
   uint32_t right_redzone_size = std::max<uint32_t>(min_right_redzone_size,
                                                    sizeof(BlockTrailer));
 
   // Calculate the total size of the allocation.
   uint32_t total_size = static_cast<uint32_t>(::common::AlignUp(
       left_redzone_size + size + right_redzone_size, chunk_size));
@@ skipping 681 matching lines @@
 void SetOnExceptionCallback(OnExceptionCallback callback) {
   g_on_exception_callback = callback;
 }
 
 void ClearOnExceptionCallback() {
   g_on_exception_callback.Reset();
 }
 
 }  // namespace asan
 }  // namespace agent