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authorthestig <thestig@chromium.org>2016-08-19 12:04:05 -0700
committerCommit bot <commit-bot@chromium.org>2016-08-19 12:04:05 -0700
commit5b13e1dc5770b73295f0c4a61c699a10eb7922e6 (patch)
treecfa3390af842b7a3da1490721d5961e99d6ea10e /testing/libfuzzer/pdf_hint_table_fuzzer.cc
parentbb5fa043a7ef2de165c7903548e5663a6f8bcf9a (diff)
downloadpdfium-5b13e1dc5770b73295f0c4a61c699a10eb7922e6.tar.xz
Add a fuzzer for CPDF_HintTables.
BUG=636559 Review-Url: https://codereview.chromium.org/2255083004
Diffstat (limited to 'testing/libfuzzer/pdf_hint_table_fuzzer.cc')
-rw-r--r--testing/libfuzzer/pdf_hint_table_fuzzer.cc94
1 files changed, 94 insertions, 0 deletions
diff --git a/testing/libfuzzer/pdf_hint_table_fuzzer.cc b/testing/libfuzzer/pdf_hint_table_fuzzer.cc
new file mode 100644
index 0000000000..d14d9464f5
--- /dev/null
+++ b/testing/libfuzzer/pdf_hint_table_fuzzer.cc
@@ -0,0 +1,94 @@
+// Copyright 2016 The PDFium 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 <cstdint>
+
+#include "core/fpdfapi/fpdf_parser/cpdf_hint_tables.h"
+#include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
+
+struct DummyLinearizedDictionary {
+ int end_of_first_page_offset;
+ int number_of_pages;
+ int first_page_object_number;
+ int first_page_number;
+ int primary_hint_stream_offset;
+ int primary_hint_stream_length;
+ int shared_hint_table_offset;
+};
+
+int32_t GetData(const int32_t** data32, const uint8_t** data, size_t* size) {
+ const int32_t* ret = *data32;
+ ++(*data32);
+ *data += 4;
+ *size -= 4;
+ return *ret;
+}
+
+class HintTableForFuzzing : public CPDF_HintTables {
+ public:
+ HintTableForFuzzing(DummyLinearizedDictionary* dict,
+ CPDF_Dictionary* linearized_dict)
+ : CPDF_HintTables(nullptr, linearized_dict), dict_(dict) {}
+ ~HintTableForFuzzing() {}
+
+ void Fuzz(const uint8_t* data, size_t size) {
+ if (dict_->shared_hint_table_offset <= 0)
+ return;
+
+ if (size < static_cast<size_t>(dict_->shared_hint_table_offset))
+ return;
+
+ CFX_BitStream bs;
+ bs.Init(data, size);
+ if (!ReadPageHintTable(&bs))
+ return;
+ ReadSharedObjHintTable(&bs, dict_->shared_hint_table_offset);
+ }
+
+ private:
+ int GetEndOfFirstPageOffset() const override {
+ return dict_->end_of_first_page_offset;
+ }
+ int GetNumberOfPages() const override { return dict_->number_of_pages; }
+ int GetFirstPageObjectNumber() const override {
+ return dict_->first_page_object_number;
+ }
+ int GetFirstPageNumber() const override { return dict_->first_page_number; }
+ int ReadPrimaryHintStreamOffset() const override {
+ return dict_->primary_hint_stream_offset;
+ }
+ int ReadPrimaryHintStreamLength() const override {
+ return dict_->primary_hint_stream_length;
+ }
+
+ DummyLinearizedDictionary* const dict_;
+};
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+ // Need 28 bytes for |dummy_dict|.
+ // The header section of page offset hint table is 36 bytes.
+ // The header section of shared object hint table is 24 bytes.
+ if (size < 28 + 36 + 24)
+ return 0;
+
+ const int32_t* data32 = reinterpret_cast<const int32_t*>(data);
+ DummyLinearizedDictionary dummy_dict;
+ dummy_dict.end_of_first_page_offset = GetData(&data32, &data, &size);
+ dummy_dict.number_of_pages = GetData(&data32, &data, &size);
+ dummy_dict.first_page_object_number = GetData(&data32, &data, &size);
+ dummy_dict.first_page_number = GetData(&data32, &data, &size);
+ dummy_dict.primary_hint_stream_offset = GetData(&data32, &data, &size);
+ dummy_dict.primary_hint_stream_length = GetData(&data32, &data, &size);
+ dummy_dict.shared_hint_table_offset = GetData(&data32, &data, &size);
+
+ CPDF_Dictionary* dummy_linearized_dict = new CPDF_Dictionary;
+
+ {
+ HintTableForFuzzing hint_table(&dummy_dict, dummy_linearized_dict);
+ hint_table.Fuzz(data, size);
+ }
+
+ dummy_linearized_dict->Release();
+ return 0;
+}