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283 lines
8.3 KiB
283 lines
8.3 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "VoldNativeService.h"
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#include "VolumeManager.h"
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#include "MoveTask.h"
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#include <fstream>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include <private/android_filesystem_config.h>
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#ifndef LOG_TAG
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#define LOG_TAG "vold"
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#endif
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using android::base::StringPrintf;
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using std::endl;
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namespace android {
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namespace vold {
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namespace {
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constexpr const char* kDump = "android.permission.DUMP";
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static binder::Status ok() {
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return binder::Status::ok();
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}
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static binder::Status exception(uint32_t code, const std::string& msg) {
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return binder::Status::fromExceptionCode(code, String8(msg.c_str()));
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}
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static binder::Status error(const std::string& msg) {
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PLOG(ERROR) << msg;
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return binder::Status::fromServiceSpecificError(errno, String8(msg.c_str()));
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}
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static binder::Status translate(uint32_t status) {
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if (status == 0) {
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return binder::Status::ok();
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} else {
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return binder::Status::fromExceptionCode(status);
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}
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}
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binder::Status checkPermission(const char* permission) {
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pid_t pid;
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uid_t uid;
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if (checkCallingPermission(String16(permission), reinterpret_cast<int32_t*>(&pid),
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reinterpret_cast<int32_t*>(&uid))) {
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return ok();
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} else {
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return exception(binder::Status::EX_SECURITY,
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StringPrintf("UID %d / PID %d lacks permission %s", uid, pid, permission));
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}
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}
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binder::Status checkUid(uid_t expectedUid) {
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uid_t uid = IPCThreadState::self()->getCallingUid();
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if (uid == expectedUid || uid == AID_ROOT) {
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return ok();
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} else {
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return exception(binder::Status::EX_SECURITY,
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StringPrintf("UID %d is not expected UID %d", uid, expectedUid));
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}
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}
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#define ENFORCE_UID(uid) { \
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binder::Status status = checkUid((uid)); \
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if (!status.isOk()) { \
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return status; \
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} \
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}
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#define ACQUIRE_LOCK std::lock_guard<std::mutex> lock(VolumeManager::Instance()->getLock());
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} // namespace
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status_t VoldNativeService::start() {
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IPCThreadState::self()->disableBackgroundScheduling(true);
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status_t ret = BinderService<VoldNativeService>::publish();
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if (ret != android::OK) {
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return ret;
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}
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sp<ProcessState> ps(ProcessState::self());
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ps->startThreadPool();
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ps->giveThreadPoolName();
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return android::OK;
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}
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status_t VoldNativeService::dump(int fd, const Vector<String16> & /* args */) {
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auto out = std::fstream(StringPrintf("/proc/self/fd/%d", fd));
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const binder::Status dump_permission = checkPermission(kDump);
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if (!dump_permission.isOk()) {
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out << dump_permission.toString8() << endl;
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return PERMISSION_DENIED;
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}
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ACQUIRE_LOCK;
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out << "vold is happy!" << endl;
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out.flush();
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return NO_ERROR;
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}
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binder::Status VoldNativeService::reset() {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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return translate(VolumeManager::Instance()->reset());
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}
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binder::Status VoldNativeService::shutdown() {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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return translate(VolumeManager::Instance()->shutdown());
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}
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binder::Status VoldNativeService::setDebug(bool debug) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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return translate(VolumeManager::Instance()->setDebug(debug));
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}
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binder::Status VoldNativeService::onUserAdded(int32_t userId, int32_t userSerial) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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return translate(VolumeManager::Instance()->onUserAdded(userId, userSerial));
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}
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binder::Status VoldNativeService::onUserRemoved(int32_t userId) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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return translate(VolumeManager::Instance()->onUserRemoved(userId));
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}
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binder::Status VoldNativeService::onUserStarted(int32_t userId) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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return translate(VolumeManager::Instance()->onUserStarted(userId));
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}
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binder::Status VoldNativeService::onUserStopped(int32_t userId) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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return translate(VolumeManager::Instance()->onUserStopped(userId));
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}
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binder::Status VoldNativeService::partition(const std::string& diskId, int32_t partitionType, int32_t ratio) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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auto disk = VolumeManager::Instance()->findDisk(diskId);
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if (disk == nullptr) {
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return error("Failed to find disk " + diskId);
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}
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switch (partitionType) {
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case PARTITION_TYPE_PUBLIC: return translate(disk->partitionPublic());
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case PARTITION_TYPE_PRIVATE: return translate(disk->partitionPrivate());
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case PARTITION_TYPE_MIXED: return translate(disk->partitionMixed(ratio));
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default: return error("Unknown type " + std::to_string(partitionType));
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}
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}
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binder::Status VoldNativeService::forgetPartition(const std::string& partGuid) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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return translate(VolumeManager::Instance()->forgetPartition(partGuid));
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}
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binder::Status VoldNativeService::mount(const std::string& volId, int32_t mountFlags, int32_t mountUserId) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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auto vol = VolumeManager::Instance()->findVolume(volId);
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if (vol == nullptr) {
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return error("Failed to find volume " + volId);
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}
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vol->setMountFlags(mountFlags);
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vol->setMountUserId(mountUserId);
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int res = vol->mount();
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if (mountFlags & MOUNT_FLAG_PRIMARY) {
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VolumeManager::Instance()->setPrimary(vol);
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}
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return translate(res);
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}
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binder::Status VoldNativeService::unmount(const std::string& volId) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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auto vol = VolumeManager::Instance()->findVolume(volId);
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if (vol == nullptr) {
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return error("Failed to find volume " + volId);
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}
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return translate(vol->unmount());
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}
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binder::Status VoldNativeService::format(const std::string& volId, const std::string& fsType) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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auto vol = VolumeManager::Instance()->findVolume(volId);
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if (vol == nullptr) {
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return error("Failed to find volume " + volId);
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}
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return translate(vol->format(fsType));
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}
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binder::Status VoldNativeService::benchmark(const std::string& volId, int64_t* _aidl_return) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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*_aidl_return = VolumeManager::Instance()->benchmarkPrivate(volId);
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return ok();
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}
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binder::Status VoldNativeService::moveStorage(const std::string& fromVolId, const std::string& toVolId) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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auto fromVol = VolumeManager::Instance()->findVolume(fromVolId);
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auto toVol = VolumeManager::Instance()->findVolume(toVolId);
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if (fromVol == nullptr) {
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return error("Failed to find volume " + fromVolId);
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} else if (toVol == nullptr) {
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return error("Failed to find volume " + toVolId);
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}
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(new android::vold::MoveTask(fromVol, toVol))->start();
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return ok();
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}
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binder::Status VoldNativeService::remountUid(int32_t uid, int32_t remountMode) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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std::string tmp;
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switch (remountMode) {
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case REMOUNT_MODE_NONE: tmp = "none"; break;
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case REMOUNT_MODE_DEFAULT: tmp = "default"; break;
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case REMOUNT_MODE_READ: tmp = "read"; break;
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case REMOUNT_MODE_WRITE: tmp = "write"; break;
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default: return error("Unknown mode " + std::to_string(remountMode));
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}
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return translate(VolumeManager::Instance()->remountUid(uid, tmp));
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}
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binder::Status VoldNativeService::mkdirs(const std::string& path) {
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ENFORCE_UID(AID_SYSTEM);
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ACQUIRE_LOCK;
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return translate(VolumeManager::Instance()->mkdirs(path.c_str()));
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}
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} // namespace vold
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} // namespace android
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