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- // Copyright 2016 The Chromium 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 <stddef.h>
- #include <stdint.h>
- #include <random>
- #include <string>
- #include "libxml/parser.h"
- #include "base/at_exit.h"
- #include "base/bind.h"
- #include "base/command_line.h"
- #include "base/i18n/icu_util.h"
- #include "base/run_loop.h"
- #include "base/task/single_thread_task_executor.h"
- #include "components/search_engines/search_terms_data.h"
- #include "components/search_engines/template_url.h"
- #include "components/search_engines/template_url_parser.h"
- #include "mojo/core/embedder/embedder.h"
- #include "services/data_decoder/public/cpp/test_support/in_process_data_decoder.h"
- #include "testing/libfuzzer/libfuzzer_exports.h"
- bool PseudoRandomFilter(std::mt19937* generator,
- std::uniform_int_distribution<uint16_t>* pool,
- const std::string&,
- const std::string&) {
- // Return true 254/255 times, ie: as if pool only returned uint8_t.
- return (*pool)(*generator) % (UINT8_MAX + 1);
- }
- struct FuzzerFixedParams {
- uint32_t seed_;
- };
- base::AtExitManager at_exit_manager; // used by ICU integration
- extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv) {
- CHECK(base::i18n::InitializeICU());
- CHECK(base::CommandLine::Init(*argc, *argv));
- return 0;
- }
- void ignore(void* ctx, const char* msg, ...) {
- // Error handler to avoid error message spam from libxml parser.
- }
- class Env {
- public:
- Env() : executor_(base::MessagePumpType::IO) {
- mojo::core::Init();
- xmlSetGenericErrorFunc(nullptr, &ignore);
- }
- private:
- base::SingleThreadTaskExecutor executor_;
- data_decoder::test::InProcessDataDecoder data_decoder_;
- };
- extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
- static Env env;
- if (size < sizeof(FuzzerFixedParams)) {
- return 0;
- }
- const FuzzerFixedParams* params =
- reinterpret_cast<const FuzzerFixedParams*>(data);
- size -= sizeof(FuzzerFixedParams);
- std::mt19937 generator(params->seed_);
- // Use a uint16_t here instead of uint8_t because uniform_int_distribution
- // does not support 8 bit types on Windows.
- std::uniform_int_distribution<uint16_t> pool(0, 1);
- base::RunLoop run_loop;
- SearchTermsData search_terms_data;
- std::string string_data(reinterpret_cast<const char*>(params + 1), size);
- TemplateURLParser::ParameterFilter filter =
- base::BindRepeating(&PseudoRandomFilter, base::Unretained(&generator),
- base::Unretained(&pool));
- TemplateURLParser::Parse(&search_terms_data, string_data, filter,
- base::BindOnce(
- [](base::OnceClosure quit_closure,
- std::unique_ptr<TemplateURL> ignored) {
- std::move(quit_closure).Run();
- },
- run_loop.QuitClosure()));
- run_loop.Run();
- return 0;
- }
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