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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/web_package/web_bundle_parser.h"
#include <stddef.h>
#include <stdint.h>
#include <optional>
#include <string>
#include "base/at_exit.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/web_package/web_bundle_parser_factory.h"
#include "mojo/core/embedder/embedder.h"
#include "mojo/public/cpp/bindings/receiver_set.h"
namespace {
class DataSource : public web_package::mojom::BundleDataSource {
public:
DataSource(const bool is_random_access_context, const std::string& data)
: is_random_access_context_(is_random_access_context), data_(data) {}
void Read(uint64_t offset, uint64_t length, ReadCallback callback) override {
if (offset >= data_.size()) {
std::move(callback).Run(std::nullopt);
return;
}
const auto start = data_.begin() + offset;
length = std::min(length, data_.size() - offset);
std::move(callback).Run(std::vector<uint8_t>(start, start + length));
}
void Length(LengthCallback callback) override {
std::move(callback).Run(data_.size());
}
void IsRandomAccessContext(IsRandomAccessContextCallback callback) override {
std::move(callback).Run(is_random_access_context_);
}
void AddReceiver(
mojo::PendingReceiver<web_package::mojom::BundleDataSource> receiver) {
receivers_.Add(this, std::move(receiver));
}
void Close(CloseCallback callback) override { std::move(callback).Run(); }
private:
bool is_random_access_context_;
const std::string data_;
mojo::ReceiverSet<web_package::mojom::BundleDataSource> receivers_;
};
class WebBundleParserFuzzer {
public:
WebBundleParserFuzzer(const bool is_random_access_context,
const bool parse_integrity_block,
const std::string& data)
: data_source_(is_random_access_context, data),
parse_integrity_block_(parse_integrity_block) {}
void FuzzBundle(base::RunLoop* run_loop) {
mojo::PendingRemote<web_package::mojom::BundleDataSource>
data_source_remote;
data_source_.AddReceiver(
data_source_remote.InitWithNewPipeAndPassReceiver());
web_package::WebBundleParserFactory factory_impl;
web_package::mojom::WebBundleParserFactory& factory = factory_impl;
factory.GetParserForDataSource(parser_.BindNewPipeAndPassReceiver(),
/*base_url=*/std::nullopt,
std::move(data_source_remote));
quit_loop_ = run_loop->QuitClosure();
if (parse_integrity_block_) {
parser_->ParseIntegrityBlock(
base::BindOnce(&WebBundleParserFuzzer::OnParseIntegrityBlock,
base::Unretained(this)));
return;
} else {
parser_->ParseMetadata(
/*offset=*/std::nullopt,
base::BindOnce(&WebBundleParserFuzzer::OnParseMetadata,
base::Unretained(this)));
}
}
void OnParseIntegrityBlock(
web_package::mojom::BundleIntegrityBlockPtr integrity_block,
web_package::mojom::BundleIntegrityBlockParseErrorPtr error) {
if (!integrity_block) {
std::move(quit_loop_).Run();
return;
}
parser_->ParseMetadata(
integrity_block->size,
base::BindOnce(&WebBundleParserFuzzer::OnParseMetadata,
base::Unretained(this)));
}
void OnParseMetadata(web_package::mojom::BundleMetadataPtr metadata,
web_package::mojom::BundleMetadataParseErrorPtr error) {
if (!metadata) {
std::move(quit_loop_).Run();
return;
}
for (auto& item : metadata->requests) {
locations_.push_back(std::move(item.second));
}
ParseResponses(0);
}
void ParseResponses(size_t index) {
if (index >= locations_.size()) {
std::move(quit_loop_).Run();
return;
}
parser_->ParseResponse(
locations_[index]->offset, locations_[index]->length,
base::BindOnce(&WebBundleParserFuzzer::OnParseResponse,
base::Unretained(this), index));
}
void OnParseResponse(size_t index,
web_package::mojom::BundleResponsePtr response,
web_package::mojom::BundleResponseParseErrorPtr error) {
ParseResponses(index + 1);
}
private:
mojo::Remote<web_package::mojom::WebBundleParser> parser_;
DataSource data_source_;
bool parse_integrity_block_;
base::OnceClosure quit_loop_;
std::vector<web_package::mojom::BundleResponseLocationPtr> locations_;
};
struct Environment {
Environment() {
mojo::core::Init();
CHECK(base::i18n::InitializeICU());
}
// Used by ICU integration.
base::AtExitManager at_exit_manager;
base::SingleThreadTaskExecutor task_executor;
};
} // namespace
// Entry point for LibFuzzer.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
static Environment* env = new Environment();
std::string web_bundle(reinterpret_cast<const char*>(data), size);
auto hash = std::hash<std::string>()(web_bundle);
bool is_random_access_context = hash & 0b01;
bool parse_integrity_block = hash & 0b10;
WebBundleParserFuzzer fuzzer(is_random_access_context, parse_integrity_block,
web_bundle);
base::RunLoop run_loop;
env->task_executor.task_runner()->PostTask(
FROM_HERE, base::BindOnce(&WebBundleParserFuzzer::FuzzBundle,
base::Unretained(&fuzzer), &run_loop));
run_loop.Run();
return 0;
}
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