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aosp12/system/gsid/gsi_service.cpp

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/*
* Copyright (C) 2019 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 "gsi_service.h"
#include <sys/statvfs.h>
#include <sys/vfs.h>
#include <unistd.h>
#include <array>
#include <chrono>
#include <string>
#include <vector>
#include <android-base/errors.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <android/gsi/BnImageService.h>
#include <android/gsi/IGsiService.h>
#include <android/os/IVold.h>
#include <binder/IServiceManager.h>
#include <binder/LazyServiceRegistrar.h>
#include <ext4_utils/ext4_utils.h>
#include <fs_mgr.h>
#include <libavb/libavb.h>
#include <libdm/dm.h>
#include <libfiemap/image_manager.h>
#include <openssl/sha.h>
#include <private/android_filesystem_config.h>
#include <selinux/android.h>
#include <storage_literals/storage_literals.h>
#include "file_paths.h"
#include "libgsi_private.h"
namespace android {
namespace gsi {
using namespace std::literals;
using namespace android::fs_mgr;
using namespace android::fiemap;
using namespace android::storage_literals;
using android::base::ReadFileToString;
using android::base::ReadFullyAtOffset;
using android::base::RemoveFileIfExists;
using android::base::SetProperty;
using android::base::StringPrintf;
using android::base::unique_fd;
using android::base::WriteStringToFd;
using android::base::WriteStringToFile;
using android::binder::LazyServiceRegistrar;
using android::dm::DeviceMapper;
// Default userdata image size.
static constexpr int64_t kDefaultUserdataSize = int64_t(2) * 1024 * 1024 * 1024;
static bool GetAvbPublicKeyFromFd(int fd, AvbPublicKey* dst);
// Fix the file contexts of dsu metadata files.
// By default, newly created files inherit the file contexts of their parent
// directory. Since globally readable public metadata files are labeled with a
// different context, gsi_public_metadata_file, we need to call this function to
// fix their contexts after creating them.
static void RestoreconMetadataFiles() {
auto flags = SELINUX_ANDROID_RESTORECON_RECURSE | SELINUX_ANDROID_RESTORECON_SKIP_SEHASH;
selinux_android_restorecon(DSU_METADATA_PREFIX, flags);
}
GsiService::GsiService() {
progress_ = {};
}
void GsiService::Register() {
auto lazyRegistrar = LazyServiceRegistrar::getInstance();
android::sp<GsiService> service = new GsiService();
auto ret = lazyRegistrar.registerService(service, kGsiServiceName);
if (ret != android::OK) {
LOG(FATAL) << "Could not register gsi service: " << ret;
}
}
#define ENFORCE_SYSTEM \
do { \
binder::Status status = CheckUid(); \
if (!status.isOk()) return status; \
} while (0)
#define ENFORCE_SYSTEM_OR_SHELL \
do { \
binder::Status status = CheckUid(AccessLevel::SystemOrShell); \
if (!status.isOk()) return status; \
} while (0)
int GsiService::SaveInstallation(const std::string& installation) {
auto dsu_slot = GetDsuSlot(installation);
auto install_dir_file = DsuInstallDirFile(dsu_slot);
auto metadata_dir = android::base::Dirname(install_dir_file);
if (access(metadata_dir.c_str(), F_OK) != 0) {
if (mkdir(metadata_dir.c_str(), 0777) != 0) {
PLOG(ERROR) << "Failed to mkdir " << metadata_dir;
return INSTALL_ERROR_GENERIC;
}
}
auto fd = android::base::unique_fd(
open(install_dir_file.c_str(), O_RDWR | O_SYNC | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR));
if (!WriteStringToFd(installation, fd)) {
PLOG(ERROR) << "write failed: " << DsuInstallDirFile(dsu_slot);
return INSTALL_ERROR_GENERIC;
}
return INSTALL_OK;
}
static bool IsExternalStoragePath(const std::string& path);
binder::Status GsiService::openInstall(const std::string& install_dir, int* _aidl_return) {
ENFORCE_SYSTEM;
std::lock_guard<std::mutex> guard(lock_);
if (IsGsiRunning()) {
*_aidl_return = IGsiService::INSTALL_ERROR_GENERIC;
return binder::Status::ok();
}
install_dir_ = install_dir;
if (int status = ValidateInstallParams(install_dir_)) {
*_aidl_return = status;
return binder::Status::ok();
}
std::string message;
auto dsu_slot = GetDsuSlot(install_dir_);
if (!RemoveFileIfExists(GetCompleteIndication(dsu_slot), &message)) {
LOG(ERROR) << message;
}
// Remember the installation directory before allocate any resource
*_aidl_return = SaveInstallation(install_dir_);
return binder::Status::ok();
}
binder::Status GsiService::closeInstall(int* _aidl_return) {
ENFORCE_SYSTEM;
std::lock_guard<std::mutex> guard(lock_);
auto dsu_slot = GetDsuSlot(install_dir_);
std::string file = GetCompleteIndication(dsu_slot);
if (!WriteStringToFile("OK", file)) {
PLOG(ERROR) << "write failed: " << file;
*_aidl_return = INSTALL_ERROR_GENERIC;
}
*_aidl_return = INSTALL_OK;
return binder::Status::ok();
}
binder::Status GsiService::createPartition(const ::std::string& name, int64_t size, bool readOnly,
int32_t* _aidl_return) {
ENFORCE_SYSTEM;
std::lock_guard<std::mutex> guard(lock_);
if (install_dir_.empty()) {
PLOG(ERROR) << "open is required for createPartition";
*_aidl_return = INSTALL_ERROR_GENERIC;
return binder::Status::ok();
}
// Do some precursor validation on the arguments before diving into the
// install process.
if (size % LP_SECTOR_SIZE) {
LOG(ERROR) << " size " << size << " is not a multiple of " << LP_SECTOR_SIZE;
*_aidl_return = INSTALL_ERROR_GENERIC;
return binder::Status::ok();
}
if (size == 0 && name == "userdata") {
size = kDefaultUserdataSize;
}
if (name == "userdata") {
auto dsu_slot = GetDsuSlot(install_dir_);
auto key_dir = DefaultDsuMetadataKeyDir(dsu_slot);
auto key_dir_file = DsuMetadataKeyDirFile(dsu_slot);
if (!android::base::WriteStringToFile(key_dir, key_dir_file)) {
PLOG(ERROR) << "write failed: " << key_dir_file;
*_aidl_return = INSTALL_ERROR_GENERIC;
return binder::Status::ok();
}
RestoreconMetadataFiles();
}
installer_ = std::make_unique<PartitionInstaller>(this, install_dir_, name,
GetDsuSlot(install_dir_), size, readOnly);
progress_ = {};
*_aidl_return = installer_->StartInstall();
return binder::Status::ok();
}
binder::Status GsiService::closePartition(int32_t* _aidl_return) {
ENFORCE_SYSTEM;
std::lock_guard<std::mutex> guard(lock_);
if (installer_ == nullptr) {
LOG(ERROR) << "createPartition() has to be called before closePartition()";
*_aidl_return = IGsiService::INSTALL_ERROR_GENERIC;
return binder::Status::ok();
}
// It is important to not reset |installer_| here because other methods such
// as enableGsi() relies on the state of |installer_|.
*_aidl_return = installer_->FinishInstall();
return binder::Status::ok();
}
binder::Status GsiService::commitGsiChunkFromStream(const android::os::ParcelFileDescriptor& stream,
int64_t bytes, bool* _aidl_return) {
ENFORCE_SYSTEM;
std::lock_guard<std::mutex> guard(lock_);
if (!installer_) {
*_aidl_return = false;
return binder::Status::ok();
}
*_aidl_return = installer_->CommitGsiChunk(stream.get(), bytes);
return binder::Status::ok();
}
void GsiService::StartAsyncOperation(const std::string& step, int64_t total_bytes) {
std::lock_guard<std::mutex> guard(progress_lock_);
progress_.step = step;
progress_.status = STATUS_WORKING;
progress_.bytes_processed = 0;
progress_.total_bytes = total_bytes;
}
void GsiService::UpdateProgress(int status, int64_t bytes_processed) {
std::lock_guard<std::mutex> guard(progress_lock_);
progress_.status = status;
if (status == STATUS_COMPLETE) {
progress_.bytes_processed = progress_.total_bytes;
} else {
progress_.bytes_processed = bytes_processed;
}
}
binder::Status GsiService::getInstallProgress(::android::gsi::GsiProgress* _aidl_return) {
ENFORCE_SYSTEM;
std::lock_guard<std::mutex> guard(progress_lock_);
if (installer_ == nullptr) {
progress_ = {};
}
*_aidl_return = progress_;
return binder::Status::ok();
}
binder::Status GsiService::commitGsiChunkFromAshmem(int64_t bytes, bool* _aidl_return) {
ENFORCE_SYSTEM;
std::lock_guard<std::mutex> guard(lock_);
if (!installer_) {
*_aidl_return = false;
return binder::Status::ok();
}
*_aidl_return = installer_->CommitGsiChunk(bytes);
return binder::Status::ok();
}
binder::Status GsiService::setGsiAshmem(const ::android::os::ParcelFileDescriptor& ashmem,
int64_t size, bool* _aidl_return) {
ENFORCE_SYSTEM;
if (!installer_) {
*_aidl_return = false;
return binder::Status::ok();
}
*_aidl_return = installer_->MapAshmem(ashmem.get(), size);
return binder::Status::ok();
}
binder::Status GsiService::enableGsiAsync(bool one_shot, const std::string& dsuSlot,
const sp<IGsiServiceCallback>& resultCallback) {
int result;
auto status = enableGsi(one_shot, dsuSlot, &result);
if (!status.isOk()) {
LOG(ERROR) << "Could not enableGsi: " << status.exceptionMessage().string();
result = IGsiService::INSTALL_ERROR_GENERIC;
}
resultCallback->onResult(result);
return binder::Status::ok();
}
binder::Status GsiService::enableGsi(bool one_shot, const std::string& dsuSlot, int* _aidl_return) {
std::lock_guard<std::mutex> guard(lock_);
if (!WriteStringToFile(dsuSlot, kDsuActiveFile)) {
PLOG(ERROR) << "write failed: " << GetDsuSlot(install_dir_);
*_aidl_return = INSTALL_ERROR_GENERIC;
return binder::Status::ok();
}
RestoreconMetadataFiles();
if (installer_) {
ENFORCE_SYSTEM;
installer_ = {};
// Note: create the install status file last, since this is the actual boot
// indicator.
if (!SetBootMode(one_shot) || !CreateInstallStatusFile()) {
*_aidl_return = IGsiService::INSTALL_ERROR_GENERIC;
} else {
*_aidl_return = INSTALL_OK;
}
} else {
ENFORCE_SYSTEM_OR_SHELL;
*_aidl_return = ReenableGsi(one_shot);
}
installer_ = nullptr;
return binder::Status::ok();
}
binder::Status GsiService::isGsiEnabled(bool* _aidl_return) {
ENFORCE_SYSTEM_OR_SHELL;
std::lock_guard<std::mutex> guard(lock_);
std::string boot_key;
if (!GetInstallStatus(&boot_key)) {
*_aidl_return = false;
} else {
*_aidl_return = (boot_key != kInstallStatusDisabled);
}
return binder::Status::ok();
}
binder::Status GsiService::removeGsiAsync(const sp<IGsiServiceCallback>& resultCallback) {
bool result;
auto status = removeGsi(&result);
if (!status.isOk()) {
LOG(ERROR) << "Could not removeGsi: " << status.exceptionMessage().string();
result = IGsiService::INSTALL_ERROR_GENERIC;
}
resultCallback->onResult(result);
return binder::Status::ok();
}
binder::Status GsiService::removeGsi(bool* _aidl_return) {
ENFORCE_SYSTEM_OR_SHELL;
std::lock_guard<std::mutex> guard(lock_);
std::string install_dir = GetActiveInstalledImageDir();
if (IsGsiRunning()) {
// Can't remove gsi files while running.
*_aidl_return = UninstallGsi();
} else {
installer_ = {};
*_aidl_return = RemoveGsiFiles(install_dir);
}
return binder::Status::ok();
}
binder::Status GsiService::disableGsi(bool* _aidl_return) {
ENFORCE_SYSTEM_OR_SHELL;
std::lock_guard<std::mutex> guard(lock_);
*_aidl_return = DisableGsiInstall();
return binder::Status::ok();
}
binder::Status GsiService::isGsiRunning(bool* _aidl_return) {
ENFORCE_SYSTEM_OR_SHELL;
std::lock_guard<std::mutex> guard(lock_);
*_aidl_return = IsGsiRunning();
return binder::Status::ok();
}
binder::Status GsiService::isGsiInstalled(bool* _aidl_return) {
ENFORCE_SYSTEM_OR_SHELL;
std::lock_guard<std::mutex> guard(lock_);
*_aidl_return = IsGsiInstalled();
return binder::Status::ok();
}
binder::Status GsiService::isGsiInstallInProgress(bool* _aidl_return) {
ENFORCE_SYSTEM_OR_SHELL;
std::lock_guard<std::mutex> guard(lock_);
*_aidl_return = !!installer_;
return binder::Status::ok();
}
binder::Status GsiService::cancelGsiInstall(bool* _aidl_return) {
ENFORCE_SYSTEM;
should_abort_ = true;
std::lock_guard<std::mutex> guard(lock_);
should_abort_ = false;
installer_ = nullptr;
*_aidl_return = true;
return binder::Status::ok();
}
binder::Status GsiService::getInstalledGsiImageDir(std::string* _aidl_return) {
ENFORCE_SYSTEM;
std::lock_guard<std::mutex> guard(lock_);
*_aidl_return = GetActiveInstalledImageDir();
return binder::Status::ok();
}
binder::Status GsiService::getActiveDsuSlot(std::string* _aidl_return) {
ENFORCE_SYSTEM_OR_SHELL;
std::lock_guard<std::mutex> guard(lock_);
*_aidl_return = GetActiveDsuSlot();
return binder::Status::ok();
}
binder::Status GsiService::getInstalledDsuSlots(std::vector<std::string>* _aidl_return) {
ENFORCE_SYSTEM;
std::lock_guard<std::mutex> guard(lock_);
*_aidl_return = GetInstalledDsuSlots();
return binder::Status::ok();
}
binder::Status GsiService::zeroPartition(const std::string& name, int* _aidl_return) {
ENFORCE_SYSTEM_OR_SHELL;
std::lock_guard<std::mutex> guard(lock_);
if (IsGsiRunning() || !IsGsiInstalled()) {
*_aidl_return = IGsiService::INSTALL_ERROR_GENERIC;
return binder::Status::ok();
}
std::string install_dir = GetActiveInstalledImageDir();
*_aidl_return = PartitionInstaller::WipeWritable(GetDsuSlot(install_dir), install_dir, name);
return binder::Status::ok();
}
static binder::Status BinderError(const std::string& message,
FiemapStatus::ErrorCode status = FiemapStatus::ErrorCode::ERROR) {
return binder::Status::fromServiceSpecificError(static_cast<int32_t>(status), message.c_str());
}
binder::Status GsiService::dumpDeviceMapperDevices(std::string* _aidl_return) {
ENFORCE_SYSTEM_OR_SHELL;
auto& dm = DeviceMapper::Instance();
std::vector<DeviceMapper::DmBlockDevice> devices;
if (!dm.GetAvailableDevices(&devices)) {
return BinderError("Could not list devices");
}
std::stringstream text;
for (const auto& device : devices) {
text << "Device " << device.name() << " (" << device.Major() << ":" << device.Minor()
<< ")\n";
std::vector<DeviceMapper::TargetInfo> table;
if (!dm.GetTableInfo(device.name(), &table)) {
continue;
}
for (const auto& target : table) {
const auto& spec = target.spec;
auto target_type = DeviceMapper::GetTargetType(spec);
text << " " << target_type << " " << spec.sector_start << " " << spec.length << " "
<< target.data << "\n";
}
}
*_aidl_return = text.str();
return binder::Status::ok();
}
binder::Status GsiService::getAvbPublicKey(AvbPublicKey* dst, int32_t* _aidl_return) {
ENFORCE_SYSTEM;
std::lock_guard<std::mutex> guard(lock_);
if (!installer_) {
*_aidl_return = INSTALL_ERROR_GENERIC;
return binder::Status::ok();
}
int fd = installer_->GetPartitionFd();
if (!GetAvbPublicKeyFromFd(fd, dst)) {
LOG(ERROR) << "Failed to extract AVB public key";
*_aidl_return = INSTALL_ERROR_GENERIC;
return binder::Status::ok();
}
*_aidl_return = INSTALL_OK;
return binder::Status::ok();
}
binder::Status GsiService::suggestScratchSize(int64_t* _aidl_return) {
ENFORCE_SYSTEM;
static constexpr uint64_t kMinScratchSize = 512_MiB;
static constexpr uint64_t kMaxScratchSize = 2_GiB;
uint64_t size = 0;
struct statvfs info;
if (statvfs(install_dir_.c_str(), &info)) {
PLOG(ERROR) << "Could not statvfs(" << install_dir_ << ")";
} else {
// Keep the storage device at least 40% free, plus 1% for jitter.
constexpr int jitter = 1;
const uint64_t reserved_blocks =
static_cast<uint64_t>(info.f_blocks) * (kMinimumFreeSpaceThreshold + jitter) / 100;
if (info.f_bavail > reserved_blocks) {
size = (info.f_bavail - reserved_blocks) * info.f_frsize;
}
}
// We can safely downcast the result here, since we clamped the result within int64_t range.
*_aidl_return = std::clamp(size, kMinScratchSize, kMaxScratchSize);
return binder::Status::ok();
}
bool GsiService::CreateInstallStatusFile() {
if (!android::base::WriteStringToFile("0", kDsuInstallStatusFile)) {
PLOG(ERROR) << "write " << kDsuInstallStatusFile;
return false;
}
SetProperty(kGsiInstalledProp, "1");
return true;
}
bool GsiService::SetBootMode(bool one_shot) {
if (one_shot) {
if (!android::base::WriteStringToFile("1", kDsuOneShotBootFile)) {
PLOG(ERROR) << "write " << kDsuOneShotBootFile;
return false;
}
} else if (!access(kDsuOneShotBootFile, F_OK)) {
std::string error;
if (!android::base::RemoveFileIfExists(kDsuOneShotBootFile, &error)) {
LOG(ERROR) << error;
return false;
}
}
return true;
}
static binder::Status UidSecurityError() {
uid_t uid = IPCThreadState::self()->getCallingUid();
auto message = StringPrintf("UID %d is not allowed", uid);
return binder::Status::fromExceptionCode(binder::Status::EX_SECURITY, String8(message.c_str()));
}
class ImageService : public BinderService<ImageService>, public BnImageService {
public:
ImageService(GsiService* service, std::unique_ptr<ImageManager>&& impl, uid_t uid);
binder::Status getAllBackingImages(std::vector<std::string>* _aidl_return);
binder::Status createBackingImage(const std::string& name, int64_t size, int flags,
const sp<IProgressCallback>& on_progress) override;
binder::Status deleteBackingImage(const std::string& name) override;
binder::Status mapImageDevice(const std::string& name, int32_t timeout_ms,
MappedImage* mapping) override;
binder::Status unmapImageDevice(const std::string& name) override;
binder::Status backingImageExists(const std::string& name, bool* _aidl_return) override;
binder::Status isImageMapped(const std::string& name, bool* _aidl_return) override;
binder::Status getAvbPublicKey(const std::string& name, AvbPublicKey* dst,
int32_t* _aidl_return) override;
binder::Status zeroFillNewImage(const std::string& name, int64_t bytes) override;
binder::Status removeAllImages() override;
binder::Status removeDisabledImages() override;
binder::Status getMappedImageDevice(const std::string& name, std::string* device) override;
private:
bool CheckUid();
android::sp<GsiService> service_;
std::unique_ptr<ImageManager> impl_;
uid_t uid_;
};
ImageService::ImageService(GsiService* service, std::unique_ptr<ImageManager>&& impl, uid_t uid)
: service_(service), impl_(std::move(impl)), uid_(uid) {}
binder::Status ImageService::getAllBackingImages(std::vector<std::string>* _aidl_return) {
*_aidl_return = impl_->GetAllBackingImages();
return binder::Status::ok();
}
binder::Status ImageService::createBackingImage(const std::string& name, int64_t size, int flags,
const sp<IProgressCallback>& on_progress) {
if (!CheckUid()) return UidSecurityError();
std::lock_guard<std::mutex> guard(service_->lock());
std::function<bool(uint64_t, uint64_t)> callback;
if (on_progress) {
callback = [on_progress](uint64_t current, uint64_t total) -> bool {
auto status = on_progress->onProgress(static_cast<int64_t>(current),
static_cast<int64_t>(total));
if (!status.isOk()) {
LOG(ERROR) << "progress callback returned: " << status.toString8().string();
return false;
}
return true;
};
}
auto res = impl_->CreateBackingImage(name, size, flags, std::move(callback));
if (!res.is_ok()) {
return BinderError("Failed to create: " + res.string(), res.error_code());
}
return binder::Status::ok();
}
binder::Status ImageService::deleteBackingImage(const std::string& name) {
if (!CheckUid()) return UidSecurityError();
std::lock_guard<std::mutex> guard(service_->lock());
if (!impl_->DeleteBackingImage(name)) {
return BinderError("Failed to delete");
}
return binder::Status::ok();
}
binder::Status ImageService::mapImageDevice(const std::string& name, int32_t timeout_ms,
MappedImage* mapping) {
if (!CheckUid()) return UidSecurityError();
std::lock_guard<std::mutex> guard(service_->lock());
if (!impl_->MapImageDevice(name, std::chrono::milliseconds(timeout_ms), &mapping->path)) {
return BinderError("Failed to map");
}
return binder::Status::ok();
}
binder::Status ImageService::unmapImageDevice(const std::string& name) {
if (!CheckUid()) return UidSecurityError();
std::lock_guard<std::mutex> guard(service_->lock());
if (!impl_->UnmapImageDevice(name)) {
return BinderError("Failed to unmap");
}
return binder::Status::ok();
}
binder::Status ImageService::backingImageExists(const std::string& name, bool* _aidl_return) {
if (!CheckUid()) return UidSecurityError();
std::lock_guard<std::mutex> guard(service_->lock());
*_aidl_return = impl_->BackingImageExists(name);
return binder::Status::ok();
}
binder::Status ImageService::isImageMapped(const std::string& name, bool* _aidl_return) {
if (!CheckUid()) return UidSecurityError();
std::lock_guard<std::mutex> guard(service_->lock());
*_aidl_return = impl_->IsImageMapped(name);
return binder::Status::ok();
}
binder::Status ImageService::getAvbPublicKey(const std::string& name, AvbPublicKey* dst,
int32_t* _aidl_return) {
if (!CheckUid()) return UidSecurityError();
std::lock_guard<std::mutex> guard(service_->lock());
std::string device_path;
std::unique_ptr<MappedDevice> mapped_device;
if (!impl_->IsImageMapped(name)) {
mapped_device = MappedDevice::Open(impl_.get(), 10s, name);
if (!mapped_device) {
PLOG(ERROR) << "Fail to map image: " << name;
*_aidl_return = IMAGE_ERROR;
return binder::Status::ok();
}
device_path = mapped_device->path();
} else {
if (!impl_->GetMappedImageDevice(name, &device_path)) {
PLOG(ERROR) << "GetMappedImageDevice() failed";
*_aidl_return = IMAGE_ERROR;
return binder::Status::ok();
}
}
android::base::unique_fd fd(open(device_path.c_str(), O_RDONLY | O_CLOEXEC));
if (!fd.ok()) {
PLOG(ERROR) << "Fail to open mapped device: " << device_path;
*_aidl_return = IMAGE_ERROR;
return binder::Status::ok();
}
bool ok = GetAvbPublicKeyFromFd(fd.get(), dst);
fd = {};
if (!ok) {
LOG(ERROR) << "Failed to extract AVB public key";
*_aidl_return = IMAGE_ERROR;
return binder::Status::ok();
}
*_aidl_return = IMAGE_OK;
return binder::Status::ok();
}
binder::Status ImageService::zeroFillNewImage(const std::string& name, int64_t bytes) {
if (!CheckUid()) return UidSecurityError();
std::lock_guard<std::mutex> guard(service_->lock());
if (bytes < 0) {
return BinderError("Cannot use negative values");
}
auto res = impl_->ZeroFillNewImage(name, bytes);
if (!res.is_ok()) {
return BinderError("Failed to fill image with zeros: " + res.string(), res.error_code());
}
return binder::Status::ok();
}
binder::Status ImageService::removeAllImages() {
if (!CheckUid()) return UidSecurityError();
std::lock_guard<std::mutex> guard(service_->lock());
if (!impl_->RemoveAllImages()) {
return BinderError("Failed to remove all images");
}
return binder::Status::ok();
}
binder::Status ImageService::removeDisabledImages() {
if (!CheckUid()) return UidSecurityError();
std::lock_guard<std::mutex> guard(service_->lock());
if (!impl_->RemoveDisabledImages()) {
return BinderError("Failed to remove disabled images");
}
return binder::Status::ok();
}
binder::Status ImageService::getMappedImageDevice(const std::string& name, std::string* device) {
if (!CheckUid()) return UidSecurityError();
std::lock_guard<std::mutex> guard(service_->lock());
if (!impl_->GetMappedImageDevice(name, device)) {
*device = "";
}
return binder::Status::ok();
}
bool ImageService::CheckUid() {
return uid_ == IPCThreadState::self()->getCallingUid();
}
binder::Status GsiService::openImageService(const std::string& prefix,
android::sp<IImageService>* _aidl_return) {
using android::base::StartsWith;
static constexpr char kImageMetadataPrefix[] = "/metadata/gsi/";
static constexpr char kImageDataPrefix[] = "/data/gsi/";
auto in_metadata_dir = kImageMetadataPrefix + prefix;
auto in_data_dir = kImageDataPrefix + prefix;
auto install_dir_file = DsuInstallDirFile(GetDsuSlot(prefix));
std::string in_data_dir_tmp;
if (android::base::ReadFileToString(install_dir_file, &in_data_dir_tmp)) {
in_data_dir = in_data_dir_tmp;
LOG(INFO) << "load " << install_dir_file << ":" << in_data_dir;
}
std::string metadata_dir, data_dir;
if (!android::base::Realpath(in_metadata_dir, &metadata_dir)) {
PLOG(ERROR) << "realpath failed for metadata: " << in_metadata_dir;
return BinderError("Invalid path");
}
if (!android::base::Realpath(in_data_dir, &data_dir)) {
PLOG(ERROR) << "realpath failed for data: " << in_data_dir;
return BinderError("Invalid path");
}
if (!StartsWith(metadata_dir, kImageMetadataPrefix)) {
return BinderError("Invalid metadata path");
}
if (!StartsWith(data_dir, kImageDataPrefix) && !StartsWith(data_dir, kDsuSDPrefix)) {
return BinderError("Invalid data path");
}
uid_t uid = IPCThreadState::self()->getCallingUid();
if (uid != AID_ROOT) {
return UidSecurityError();
}
auto impl = ImageManager::Open(metadata_dir, data_dir);
if (!impl) {
return BinderError("Unknown error");
}
*_aidl_return = new ImageService(this, std::move(impl), uid);
return binder::Status::ok();
}
binder::Status GsiService::CheckUid(AccessLevel level) {
std::vector<uid_t> allowed_uids{AID_ROOT, AID_SYSTEM};
if (level == AccessLevel::SystemOrShell) {
allowed_uids.push_back(AID_SHELL);
}
uid_t uid = IPCThreadState::self()->getCallingUid();
for (const auto& allowed_uid : allowed_uids) {
if (allowed_uid == uid) {
return binder::Status::ok();
}
}
return UidSecurityError();
}
static bool IsExternalStoragePath(const std::string& path) {
if (!android::base::StartsWith(path, kDsuSDPrefix)) {
return false;
}
unique_fd fd(open(path.c_str(), O_RDONLY | O_CLOEXEC | O_NOFOLLOW));
if (fd < 0) {
PLOG(ERROR) << "open failed: " << path;
return false;
}
struct statfs info;
if (fstatfs(fd, &info)) {
PLOG(ERROR) << "statfs failed: " << path;
return false;
}
LOG(ERROR) << "fs type: " << info.f_type;
return info.f_type == MSDOS_SUPER_MAGIC;
}
int GsiService::ValidateInstallParams(std::string& install_dir) {
// If no install path was specified, use the default path. We also allow
// specifying the top-level folder, and then we choose the correct location
// underneath.
if (install_dir.empty() || install_dir == "/data/gsi") {
install_dir = kDefaultDsuImageFolder;
}
if (access(install_dir.c_str(), F_OK) != 0 && (errno == ENOENT)) {
if (android::base::StartsWith(install_dir, kDsuSDPrefix)) {
if (mkdir(install_dir.c_str(), 0755) != 0) {
PLOG(ERROR) << "Failed to create " << install_dir;
return INSTALL_ERROR_GENERIC;
}
}
}
// Normalize the path and add a trailing slash.
std::string origInstallDir = install_dir;
if (!android::base::Realpath(origInstallDir, &install_dir)) {
PLOG(ERROR) << "realpath failed: " << origInstallDir;
return INSTALL_ERROR_GENERIC;
}
// Ensure the path ends in / for consistency.
if (!android::base::EndsWith(install_dir, "/")) {
install_dir += "/";
}
// Currently, we can only install to /data/gsi/ or external storage.
if (IsExternalStoragePath(install_dir)) {
Fstab fstab;
if (!ReadDefaultFstab(&fstab)) {
LOG(ERROR) << "cannot read default fstab";
return INSTALL_ERROR_GENERIC;
}
FstabEntry* system = GetEntryForMountPoint(&fstab, "/system");
if (!system) {
LOG(ERROR) << "cannot find /system fstab entry";
return INSTALL_ERROR_GENERIC;
}
if (fs_mgr_verity_is_check_at_most_once(*system)) {
LOG(ERROR) << "cannot install GSIs to external media if verity uses check_at_most_once";
return INSTALL_ERROR_GENERIC;
}
} else if (install_dir != kDefaultDsuImageFolder) {
LOG(ERROR) << "cannot install DSU to " << install_dir;
return INSTALL_ERROR_GENERIC;
}
return INSTALL_OK;
}
std::string GsiService::GetActiveDsuSlot() {
if (!install_dir_.empty()) {
return GetDsuSlot(install_dir_);
} else {
std::string active_dsu;
return GetActiveDsu(&active_dsu) ? active_dsu : "";
}
}
std::string GsiService::GetActiveInstalledImageDir() {
// Just in case an install was left hanging.
if (installer_) {
return installer_->install_dir();
} else {
return GetInstalledImageDir();
}
}
std::string GsiService::GetInstalledImageDir() {
// If there's no install left, just return /data/gsi since that's where
// installs go by default.
std::string active_dsu;
std::string dir;
if (GetActiveDsu(&active_dsu) &&
android::base::ReadFileToString(DsuInstallDirFile(active_dsu), &dir)) {
return dir;
}
return kDefaultDsuImageFolder;
}
int GsiService::ReenableGsi(bool one_shot) {
if (!android::gsi::IsGsiInstalled()) {
LOG(ERROR) << "no gsi installed - cannot re-enable";
return INSTALL_ERROR_GENERIC;
}
std::string boot_key;
if (!GetInstallStatus(&boot_key)) {
PLOG(ERROR) << "read " << kDsuInstallStatusFile;
return INSTALL_ERROR_GENERIC;
}
if (boot_key != kInstallStatusDisabled) {
LOG(ERROR) << "GSI is not currently disabled";
return INSTALL_ERROR_GENERIC;
}
if (IsGsiRunning()) {
if (!SetBootMode(one_shot) || !CreateInstallStatusFile()) {
return IGsiService::INSTALL_ERROR_GENERIC;
}
return IGsiService::INSTALL_OK;
}
if (!SetBootMode(one_shot) || !CreateInstallStatusFile()) {
return IGsiService::INSTALL_ERROR_GENERIC;
}
return IGsiService::INSTALL_OK;
}
static android::sp<android::os::IVold> GetVoldService() {
return android::waitForService<android::os::IVold>(android::String16("vold"));
}
bool GsiService::RemoveGsiFiles(const std::string& install_dir) {
bool ok = true;
auto active_dsu = GetDsuSlot(install_dir);
if (auto manager = ImageManager::Open(MetadataDir(active_dsu), install_dir)) {
std::vector<std::string> images = manager->GetAllBackingImages();
for (auto&& image : images) {
if (!android::base::EndsWith(image, kDsuPostfix)) {
continue;
}
if (manager->IsImageMapped(image)) {
ok &= manager->UnmapImageDevice(image);
}
ok &= manager->DeleteBackingImage(image);
}
}
auto dsu_slot = GetDsuSlot(install_dir);
std::vector<std::string> files{
kDsuInstallStatusFile,
kDsuOneShotBootFile,
DsuInstallDirFile(dsu_slot),
GetCompleteIndication(dsu_slot),
};
for (const auto& file : files) {
std::string message;
if (!RemoveFileIfExists(file, &message)) {
LOG(ERROR) << message;
ok = false;
}
}
if (auto vold = GetVoldService()) {
auto status = vold->destroyDsuMetadataKey(dsu_slot);
if (status.isOk()) {
std::string message;
if (!RemoveFileIfExists(DsuMetadataKeyDirFile(dsu_slot), &message)) {
LOG(ERROR) << message;
ok = false;
}
} else {
LOG(ERROR) << "Failed to destroy DSU metadata encryption key.";
ok = false;
}
} else {
LOG(ERROR) << "Failed to retrieve vold service.";
ok = false;
}
if (ok) {
SetProperty(kGsiInstalledProp, "0");
}
return ok;
}
bool GsiService::DisableGsiInstall() {
if (!android::gsi::IsGsiInstalled()) {
LOG(ERROR) << "cannot disable gsi install - no install detected";
return false;
}
if (installer_) {
LOG(ERROR) << "cannot disable gsi during GSI installation";
return false;
}
if (!DisableGsi()) {
PLOG(ERROR) << "could not write gsi status";
return false;
}
return true;
}
std::string GsiService::GetCompleteIndication(const std::string& dsu_slot) {
return DSU_METADATA_PREFIX + dsu_slot + "/complete";
}
bool GsiService::IsInstallationComplete(const std::string& dsu_slot) {
if (access(kDsuInstallStatusFile, F_OK) != 0) {
return false;
}
std::string file = GetCompleteIndication(dsu_slot);
std::string content;
if (!ReadFileToString(file, &content)) {
return false;
}
return content == "OK";
}
std::vector<std::string> GsiService::GetInstalledDsuSlots() {
std::vector<std::string> dsu_slots;
auto d = std::unique_ptr<DIR, decltype(&closedir)>(opendir(DSU_METADATA_PREFIX), closedir);
if (d != nullptr) {
struct dirent* de;
while ((de = readdir(d.get())) != nullptr) {
if (de->d_name[0] == '.') {
continue;
}
auto dsu_slot = std::string(de->d_name);
if (access(DsuInstallDirFile(dsu_slot).c_str(), F_OK) != 0) {
continue;
}
dsu_slots.push_back(dsu_slot);
}
}
return dsu_slots;
}
void GsiService::CleanCorruptedInstallation() {
for (auto&& slot : GetInstalledDsuSlots()) {
bool is_complete = IsInstallationComplete(slot);
if (!is_complete) {
LOG(INFO) << "CleanCorruptedInstallation for slot: " << slot;
std::string install_dir;
if (!android::base::ReadFileToString(DsuInstallDirFile(slot), &install_dir) ||
!RemoveGsiFiles(install_dir)) {
LOG(ERROR) << "Failed to CleanCorruptedInstallation on " << slot;
}
}
}
}
void GsiService::RunStartupTasks() {
CleanCorruptedInstallation();
std::string active_dsu;
if (!GetActiveDsu(&active_dsu)) {
PLOG(INFO) << "no DSU";
return;
}
std::string boot_key;
if (!GetInstallStatus(&boot_key)) {
PLOG(ERROR) << "read " << kDsuInstallStatusFile;
return;
}
if (!IsGsiRunning()) {
// Check if a wipe was requested from fastboot or adb-in-gsi.
if (boot_key == kInstallStatusWipe) {
RemoveGsiFiles(GetInstalledImageDir());
}
} else {
// NB: When single-boot is enabled, init will write "disabled" into the
// install_status file, which will cause GetBootAttempts to return
// false. Thus, we won't write "ok" here.
int ignore;
if (GetBootAttempts(boot_key, &ignore)) {
// Mark the GSI as having successfully booted.
if (!android::base::WriteStringToFile(kInstallStatusOk, kDsuInstallStatusFile)) {
PLOG(ERROR) << "write " << kDsuInstallStatusFile;
}
}
}
}
static bool GetAvbPublicKeyFromFd(int fd, AvbPublicKey* dst) {
// Read the AVB footer from EOF.
int64_t total_size = get_block_device_size(fd);
int64_t footer_offset = total_size - AVB_FOOTER_SIZE;
std::array<uint8_t, AVB_FOOTER_SIZE> footer_bytes;
if (!ReadFullyAtOffset(fd, footer_bytes.data(), AVB_FOOTER_SIZE, footer_offset)) {
PLOG(ERROR) << "cannot read AVB footer";
return false;
}
// Validate the AVB footer data and byte swap to native byte order.
AvbFooter footer;
if (!avb_footer_validate_and_byteswap((const AvbFooter*)footer_bytes.data(), &footer)) {
LOG(ERROR) << "invalid AVB footer";
return false;
}
// Read the VBMeta image.
std::vector<uint8_t> vbmeta_bytes(footer.vbmeta_size);
if (!ReadFullyAtOffset(fd, vbmeta_bytes.data(), vbmeta_bytes.size(), footer.vbmeta_offset)) {
PLOG(ERROR) << "cannot read VBMeta image";
return false;
}
// Validate the VBMeta image and retrieve AVB public key.
// After a successful call to avb_vbmeta_image_verify(), public_key_data
// will point to the serialized AVB public key, in the same format generated
// by the `avbtool extract_public_key` command.
const uint8_t* public_key_data;
size_t public_key_size;
AvbVBMetaVerifyResult result = avb_vbmeta_image_verify(vbmeta_bytes.data(), vbmeta_bytes.size(),
&public_key_data, &public_key_size);
if (result != AVB_VBMETA_VERIFY_RESULT_OK) {
LOG(ERROR) << "invalid VBMeta image: " << avb_vbmeta_verify_result_to_string(result);
return false;
}
if (public_key_data != nullptr) {
dst->bytes.resize(public_key_size);
memcpy(dst->bytes.data(), public_key_data, public_key_size);
dst->sha1.resize(SHA_DIGEST_LENGTH);
SHA1(public_key_data, public_key_size, dst->sha1.data());
}
return true;
}
} // namespace gsi
} // namespace android
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