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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include <stddef.h>
#include <stdint.h>
#include <random>
#include <string>
#include "libxml/parser.h"
#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/functional/bind.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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