1    :  // Copyright 2012 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/pe/transforms/prepare_headers_transform.h"
  16    :  
  17    :  #include "base/stringprintf.h"
  18    :  #include "gtest/gtest.h"
  19    :  #include "syzygy/block_graph/typed_block.h"
  20    :  #include "syzygy/pe/pe_utils.h"
  21    :  
  22    :  namespace pe {
  23    :  namespace transforms {
  24    :  
  25    :  using block_graph::BlockGraph;
  26    :  using block_graph::ConstTypedBlock;
  27    :  using block_graph::TypedBlock;
  28    :  
  29    :  namespace {
  30    :  
  31    :  class PrepareHeadersTransformTest : public testing::Test {
  32    :   public:
  33  E :    PrepareHeadersTransformTest()
  34    :        : dos_header_block_(NULL), nt_headers_block_(NULL) {
  35  E :    }
  36    :  
  37  E :    virtual void SetUp() {
  38  E :      block_graph_.AddSection(kCodeSectionName, kCodeCharacteristics);
  39    :      block_graph_.AddSection(kReadOnlyDataSectionName,
  40  E :                               kReadOnlyDataCharacteristics);
  41    :      block_graph_.AddSection(kReadWriteDataSectionName,
  42  E :                               kReadWriteDataCharacteristics);
  43  E :      block_graph_.AddSection(kTlsSectionName, kReadOnlyDataCharacteristics);
  44    :      block_graph_.AddSection(kResourceSectionName,
  45  E :                               kReadOnlyDataCharacteristics);
  46  E :      block_graph_.AddSection(kRelocSectionName, kRelocCharacteristics);
  47    :  
  48  E :      expected_dos_header_size_ = sizeof(IMAGE_DOS_HEADER);
  49    :      expected_nt_headers_size_ = sizeof(IMAGE_NT_HEADERS) +
  50  E :          block_graph_.sections().size() * sizeof(IMAGE_SECTION_HEADER);
  51  E :    }
  52    :  
  53    :    // Builds a set of dummy DOS and NT headers.
  54  E :    void BuildHeaders(size_t extra_dos_header_bytes, size_t section_count) {
  55    :      dos_header_block_ = block_graph_.AddBlock(BlockGraph::DATA_BLOCK,
  56    :          sizeof(IMAGE_DOS_HEADER) + extra_dos_header_bytes,
  57  E :          "Dos Header");
  58  E :      ASSERT_TRUE(dos_header_block_ != NULL);
  59  E :      dos_header_block_->AllocateData(dos_header_block_->size());
  60    :  
  61    :      nt_headers_block_ = block_graph_.AddBlock(BlockGraph::DATA_BLOCK,
  62    :          sizeof(IMAGE_NT_HEADERS) + section_count * sizeof(IMAGE_SECTION_HEADER),
  63  E :          "Nt Headers");
  64  E :      ASSERT_TRUE(nt_headers_block_ != NULL);
  65  E :      nt_headers_block_->AllocateData(nt_headers_block_->size());
  66    :  
  67  E :      TypedBlock<IMAGE_DOS_HEADER> dos_header;
  68  E :      ASSERT_TRUE(dos_header.Init(0, dos_header_block_));
  69    :      dos_header.SetReference(BlockGraph::RELATIVE_REF,
  70    :                              dos_header->e_lfanew,
  71    :                              nt_headers_block_,
  72  E :                              0, 0);
  73    :  
  74  E :      TypedBlock<IMAGE_NT_HEADERS> nt_headers;
  75  E :      ASSERT_TRUE(nt_headers.Init(0, nt_headers_block_));
  76  E :      nt_headers->OptionalHeader.FileAlignment = 512;
  77  E :    }
  78    :  
  79    :    size_t expected_dos_header_size_;
  80    :    size_t expected_nt_headers_size_;
  81    :  
  82    :    BlockGraph block_graph_;
  83    :    BlockGraph::Block* dos_header_block_;
  84    :    BlockGraph::Block* nt_headers_block_;
  85    :  };
  86    :  
  87    :  }  // namespace
  88    :  
  89  E :  TEST_F(PrepareHeadersTransformTest, ShrinkHeaders) {
  90  E :    BuildHeaders(100, block_graph_.sections().size() + 2);
  91    :  
  92  E :    PrepareHeadersTransform tx;
  93  E :    EXPECT_TRUE(tx.TransformBlockGraph(&block_graph_, dos_header_block_));
  94    :  
  95  E :    ConstTypedBlock<IMAGE_NT_HEADERS> nt_headers;
  96  E :    ASSERT_TRUE(nt_headers.Init(0, nt_headers_block_));
  97    :  
  98  E :    EXPECT_TRUE(IsValidDosHeaderBlock(dos_header_block_));
  99  E :    EXPECT_EQ(expected_nt_headers_size_, nt_headers_block_->size());
 100  E :    EXPECT_EQ(expected_nt_headers_size_, nt_headers_block_->data_size());
 101    :    EXPECT_EQ(block_graph_.sections().size(),
 102  E :              nt_headers->FileHeader.NumberOfSections);
 103  E :  }
 104    :  
 105  E :  TEST_F(PrepareHeadersTransformTest, GrowHeaders) {
 106  E :    size_t section_count = block_graph_.sections().size() - 2;
 107  E :    ASSERT_LT(section_count, block_graph_.sections().size());
 108  E :    BuildHeaders(0, section_count);
 109    :  
 110  E :    PrepareHeadersTransform tx;
 111  E :    EXPECT_TRUE(tx.TransformBlockGraph(&block_graph_, dos_header_block_));
 112    :  
 113  E :    ConstTypedBlock<IMAGE_NT_HEADERS> nt_headers;
 114  E :    ASSERT_TRUE(nt_headers.Init(0, nt_headers_block_));
 115    :  
 116  E :    EXPECT_TRUE(IsValidDosHeaderBlock(dos_header_block_));
 117  E :    EXPECT_EQ(expected_nt_headers_size_, nt_headers_block_->size());
 118  E :    EXPECT_EQ(expected_nt_headers_size_, nt_headers_block_->data_size());
 119    :    EXPECT_EQ(block_graph_.sections().size(),
 120  E :              nt_headers->FileHeader.NumberOfSections);
 121  E :  }
 122    :  
 123    :  }  // namespace transforms
 124    :  }  // namespace pe