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// Copyright (C) 2020 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 <memory>
#include <set>
#include <string>
#include <android-base/file.h>
#include <android-base/stringprintf.h>
#include <android/snapshot/snapshot_fuzz.pb.h>
#include <libdm/loop_control.h>
#include <libfiemap/image_manager.h>
#include <liblp/liblp.h>
#include <libsnapshot/auto_device.h>
#include <libsnapshot/test_helpers.h>
// libsnapshot-specific code for fuzzing. Defines fake classes that are depended
// by SnapshotManager.
#include "android/snapshot/snapshot_fuzz.pb.h"
namespace android::snapshot {
class AutoMemBasedDir;
class SnapshotFuzzDeviceInfo;
class NoOpAutoDevice : public AutoDevice {
public:
NoOpAutoDevice(bool mounted) : AutoDevice(mounted ? "no_op" : "") {}
};
struct SnapshotTestModule {
std::unique_ptr<ISnapshotManager> snapshot;
SnapshotFuzzDeviceInfo* device_info = nullptr;
TestPartitionOpener* opener = nullptr;
};
// Prepare test environment. This has a heavy overhead and should be done once.
class SnapshotFuzzEnv {
public:
// Check if test should run at all.
static bool ShouldSkipTest();
// Initialize the environment.
SnapshotFuzzEnv();
~SnapshotFuzzEnv();
// Soft reset part of the environment before running the next test.
// Abort if fails.
void CheckSoftReset();
// Create a snapshot manager for this test run.
// Client is responsible for maintaining the lifetime of |data| over the life time of
// ISnapshotManager.
SnapshotTestModule CheckCreateSnapshotManager(const SnapshotFuzzData& data);
std::unique_ptr<android::fiemap::IImageManager> CheckCreateFakeImageManager();
// Return path to super partition.
const std::string& super() const;
private:
std::unique_ptr<AutoMemBasedDir> fake_root_;
std::unique_ptr<android::dm::LoopControl> loop_control_;
std::string fake_data_mount_point_;
std::unique_ptr<AutoDevice> auto_delete_data_mount_point_;
std::unique_ptr<AutoDevice> mapped_super_;
std::string fake_super_;
std::unique_ptr<AutoDevice> mapped_data_;
std::string fake_data_block_device_;
std::unique_ptr<AutoDevice> mounted_data_;
static std::unique_ptr<AutoDevice> CheckMapImage(const std::string& fake_persist_path,
uint64_t size,
android::dm::LoopControl* control,
std::string* mapped_path);
static std::unique_ptr<AutoDevice> CheckMountFormatData(const std::string& blk_device,
const std::string& mount_point);
void CheckWriteSuperMetadata(const SnapshotFuzzData& proto,
const android::fs_mgr::IPartitionOpener& opener);
};
class SnapshotFuzzDeviceInfo : public ISnapshotManager::IDeviceInfo {
public:
// Client is responsible for maintaining the lifetime of |data|.
SnapshotFuzzDeviceInfo(SnapshotFuzzEnv* env, const FuzzDeviceInfoData& data,
std::unique_ptr<TestPartitionOpener>&& partition_opener,
const std::string& metadata_dir)
: env_(env),
data_(&data),
partition_opener_(std::move(partition_opener)),
metadata_dir_(metadata_dir) {}
// Following APIs are mocked.
std::string GetMetadataDir() const override { return metadata_dir_; }
std::string GetSuperDevice(uint32_t) const override {
// TestPartitionOpener can recognize this.
return "super";
}
const android::fs_mgr::IPartitionOpener& GetPartitionOpener() const override {
return *partition_opener_;
}
// Following APIs are fuzzed.
std::string GetSlotSuffix() const override { return CurrentSlotIsA() ? "_a" : "_b"; }
std::string GetOtherSlotSuffix() const override { return CurrentSlotIsA() ? "_b" : "_a"; }
bool IsOverlayfsSetup() const override { return data_->is_overlayfs_setup(); }
bool SetBootControlMergeStatus(android::hardware::boot::V1_1::MergeStatus) override {
return data_->allow_set_boot_control_merge_status();
}
bool SetSlotAsUnbootable(unsigned int) override {
return data_->allow_set_slot_as_unbootable();
}
bool IsRecovery() const override { return data_->is_recovery(); }
bool IsFirstStageInit() const override { return false; }
std::unique_ptr<IImageManager> OpenImageManager() const {
return env_->CheckCreateFakeImageManager();
}
void SwitchSlot() { switched_slot_ = !switched_slot_; }
private:
SnapshotFuzzEnv* env_;
const FuzzDeviceInfoData* data_;
std::unique_ptr<TestPartitionOpener> partition_opener_;
std::string metadata_dir_;
bool switched_slot_ = false;
bool CurrentSlotIsA() const { return data_->slot_suffix_is_a() != switched_slot_; }
};
// A spy class on ImageManager implementation. Upon destruction, unmaps all images
// map through this object.
class SnapshotFuzzImageManager : public android::fiemap::IImageManager {
public:
static std::unique_ptr<SnapshotFuzzImageManager> Open(const std::string& metadata_dir,
const std::string& data_dir) {
auto impl = android::fiemap::ImageManager::Open(metadata_dir, data_dir);
if (impl == nullptr) return nullptr;
return std::unique_ptr<SnapshotFuzzImageManager>(
new SnapshotFuzzImageManager(std::move(impl)));
}
~SnapshotFuzzImageManager();
// Spied APIs.
bool MapImageDevice(const std::string& name, const std::chrono::milliseconds& timeout_ms,
std::string* path) override;
// Other functions call through.
android::fiemap::FiemapStatus CreateBackingImage(
const std::string& name, uint64_t size, int flags,
std::function<bool(uint64_t, uint64_t)>&& on_progress) override {
return impl_->CreateBackingImage(name, size, flags, std::move(on_progress));
}
bool DeleteBackingImage(const std::string& name) override {
return impl_->DeleteBackingImage(name);
}
bool UnmapImageDevice(const std::string& name) override {
return impl_->UnmapImageDevice(name);
}
bool BackingImageExists(const std::string& name) override {
return impl_->BackingImageExists(name);
}
bool IsImageMapped(const std::string& name) override { return impl_->IsImageMapped(name); }
bool MapImageWithDeviceMapper(const IPartitionOpener& opener, const std::string& name,
std::string* dev) override {
return impl_->MapImageWithDeviceMapper(opener, name, dev);
}
bool GetMappedImageDevice(const std::string& name, std::string* device) override {
return impl_->GetMappedImageDevice(name, device);
}
bool MapAllImages(const std::function<bool(std::set<std::string>)>& init) override {
return impl_->MapAllImages(init);
}
bool DisableImage(const std::string& name) override { return impl_->DisableImage(name); }
bool RemoveDisabledImages() override { return impl_->RemoveDisabledImages(); }
std::vector<std::string> GetAllBackingImages() override { return impl_->GetAllBackingImages(); }
android::fiemap::FiemapStatus ZeroFillNewImage(const std::string& name,
uint64_t bytes) override {
return impl_->ZeroFillNewImage(name, bytes);
}
bool RemoveAllImages() override { return impl_->RemoveAllImages(); }
bool UnmapImageIfExists(const std::string& name) override {
return impl_->UnmapImageIfExists(name);
}
private:
std::unique_ptr<android::fiemap::IImageManager> impl_;
std::set<std::string> mapped_;
SnapshotFuzzImageManager(std::unique_ptr<android::fiemap::IImageManager>&& impl)
: impl_(std::move(impl)) {}
};
} // namespace android::snapshot
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