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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <fuzzer/FuzzedDataProvider.h>
#include <hidl/metadata.h>
#include <import_parser.h>
#include <interface_utils.h>
#include <rlimit_parser.h>
using namespace android;
using namespace android::init;
const std::vector<std::string> kValidInputs[] = {
{"", "cpu", "10", "10"}, {"", "RLIM_CPU", "10", "10"}, {"", "12", "unlimited", "10"},
{"", "13", "-1", "10"}, {"", "14", "10", "unlimited"}, {"", "15", "10", "-1"},
};
const std::string kValidPaths[] = {
"/system/etc/init/hw/init.rc",
"/system/etc/init",
};
const int32_t kMaxBytes = 256;
const std::string kValidInterfaces = "android.frameworks.vr.composer@2.0::IVrComposerClient";
class InitParserFuzzer {
public:
InitParserFuzzer(const uint8_t* data, size_t size) : fdp_(data, size){};
void Process();
private:
void InvokeParser();
void InvokeLimitParser();
void InvokeInterfaceUtils();
InterfaceInheritanceHierarchyMap GenerateHierarchyMap();
std::vector<HidlInterfaceMetadata> GenerateInterfaceMetadata();
FuzzedDataProvider fdp_;
};
void InitParserFuzzer::InvokeLimitParser() {
if (fdp_.ConsumeBool()) {
std::vector<std::string> input;
input.push_back("");
input.push_back(fdp_.ConsumeRandomLengthString(kMaxBytes));
input.push_back(fdp_.ConsumeRandomLengthString(kMaxBytes));
input.push_back(fdp_.ConsumeRandomLengthString(kMaxBytes));
ParseRlimit(input);
} else {
ParseRlimit(fdp_.PickValueInArray(kValidInputs));
}
}
std::vector<HidlInterfaceMetadata> InitParserFuzzer::GenerateInterfaceMetadata() {
std::vector<HidlInterfaceMetadata> random_interface;
for (size_t idx = 0; idx < fdp_.ConsumeIntegral<size_t>(); ++idx) {
HidlInterfaceMetadata metadata;
metadata.name = fdp_.ConsumeRandomLengthString(kMaxBytes);
for (size_t idx1 = 0; idx1 < fdp_.ConsumeIntegral<size_t>(); ++idx1) {
metadata.inherited.push_back(fdp_.ConsumeRandomLengthString(kMaxBytes));
}
random_interface.push_back(metadata);
}
return random_interface;
}
InterfaceInheritanceHierarchyMap InitParserFuzzer::GenerateHierarchyMap() {
InterfaceInheritanceHierarchyMap result;
std::vector<HidlInterfaceMetadata> random_interface;
if (fdp_.ConsumeBool()) {
random_interface = GenerateInterfaceMetadata();
} else {
random_interface = HidlInterfaceMetadata::all();
}
for (const HidlInterfaceMetadata& iface : random_interface) {
std::set<FQName> inherited_interfaces;
for (const std::string& intf : iface.inherited) {
FQName fqname;
(void)fqname.setTo(intf);
inherited_interfaces.insert(fqname);
}
FQName fqname;
(void)fqname.setTo(iface.name);
result[fqname] = inherited_interfaces;
}
return result;
}
void InitParserFuzzer::InvokeInterfaceUtils() {
InterfaceInheritanceHierarchyMap hierarchy_map = GenerateHierarchyMap();
SetKnownInterfaces(hierarchy_map);
IsKnownInterface(fdp_.ConsumeRandomLengthString(kMaxBytes));
std::set<std::string> interface_set;
for (size_t idx = 0; idx < fdp_.ConsumeIntegral<size_t>(); ++idx) {
auto set_interface_values = fdp_.PickValueInArray<const std::function<void()>>({
[&]() {
interface_set.insert(("aidl/" + fdp_.ConsumeRandomLengthString(kMaxBytes)));
},
[&]() { interface_set.insert(fdp_.ConsumeRandomLengthString(kMaxBytes)); },
[&]() { interface_set.insert(kValidInterfaces); },
});
set_interface_values();
}
CheckInterfaceInheritanceHierarchy(interface_set, hierarchy_map);
}
void InitParserFuzzer::InvokeParser() {
Parser parser;
std::string name = fdp_.ConsumeBool() ? fdp_.ConsumeRandomLengthString(kMaxBytes) : "import";
parser.AddSectionParser(name, std::make_unique<ImportParser>(&parser));
std::string path = fdp_.ConsumeBool() ? fdp_.PickValueInArray(kValidPaths)
: fdp_.ConsumeRandomLengthString(kMaxBytes);
parser.ParseConfig(path);
parser.ParseConfigFileInsecure(path, false /* follow_symlinks */);
}
void InitParserFuzzer::Process() {
while (fdp_.remaining_bytes()) {
auto invoke_parser_fuzzer = fdp_.PickValueInArray<const std::function<void()>>({
[&]() { InvokeParser(); },
[&]() { InvokeInterfaceUtils(); },
[&]() { InvokeLimitParser(); },
});
invoke_parser_fuzzer();
}
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
InitParserFuzzer init_parser_fuzzer(data, size);
init_parser_fuzzer.Process();
return 0;
}
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