1    :  // Copyright 2014 Google Inc. All Rights Reserved.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  
  15    :  #include "syzygy/agent/asan/block_utils.h"
  16    :  
  17    :  #include "syzygy/agent/asan/page_protection_helpers.h"
  18    :  
  19    :  namespace agent {
  20    :  namespace asan {
  21    :  
  22  E :  bool IsBlockCorrupt(const uint8* block_header, BlockInfo* block_info) {
  23    :    // If no output structure is provided then use a local one.
  24  E :    BlockInfo local_block_info = {};
  25  E :    if (block_info == NULL) {
  26  E :      block_info = &local_block_info;
  27  E :    } else {
  28  i :      ::memset(block_info, 0, sizeof(BlockInfo));
  29    :    }
  30    :  
  31    :    if (!GetBlockInfo(block_header, block_info) ||
  32    :        block_info->header->magic != kBlockHeaderMagic ||
  33  E :        !BlockChecksumIsValid(*block_info)) {
  34  E :      return true;
  35    :    }
  36  E :    return false;
  37  E :  }
  38    :  
  39    :  }  // namespace asan
  40    :  }  // namespace agent