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