| /* |
| * Copyright (C) 2015 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 "Disk.h" |
| #include "FsCrypt.h" |
| #include "PrivateVolume.h" |
| #include "PublicVolume.h" |
| #include "Utils.h" |
| #include "VolumeBase.h" |
| #include "VolumeEncryption.h" |
| #include "VolumeManager.h" |
| |
| #include <android-base/file.h> |
| #include <android-base/logging.h> |
| #include <android-base/parseint.h> |
| #include <android-base/properties.h> |
| #include <android-base/stringprintf.h> |
| #include <android-base/strings.h> |
| #include <fscrypt/fscrypt.h> |
| |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/mount.h> |
| #include <sys/stat.h> |
| #include <sys/sysmacros.h> |
| #include <sys/types.h> |
| #include <vector> |
| |
| using android::base::ReadFileToString; |
| using android::base::StringPrintf; |
| using android::base::WriteStringToFile; |
| |
| namespace android { |
| namespace vold { |
| |
| static const char* kSgdiskPath = "/system/bin/sgdisk"; |
| static const char* kSgdiskToken = " \t\n"; |
| |
| static const char* kSysfsLoopMaxMinors = "/sys/module/loop/parameters/max_part"; |
| static const char* kSysfsMmcMaxMinorsDeprecated = "/sys/module/mmcblk/parameters/perdev_minors"; |
| static const char* kSysfsMmcMaxMinors = "/sys/module/mmc_block/parameters/perdev_minors"; |
| |
| static const unsigned int kMajorBlockLoop = 7; |
| static const unsigned int kMajorBlockScsiA = 8; |
| static const unsigned int kMajorBlockScsiB = 65; |
| static const unsigned int kMajorBlockScsiC = 66; |
| static const unsigned int kMajorBlockScsiD = 67; |
| static const unsigned int kMajorBlockScsiE = 68; |
| static const unsigned int kMajorBlockScsiF = 69; |
| static const unsigned int kMajorBlockScsiG = 70; |
| static const unsigned int kMajorBlockScsiH = 71; |
| static const unsigned int kMajorBlockScsiI = 128; |
| static const unsigned int kMajorBlockScsiJ = 129; |
| static const unsigned int kMajorBlockScsiK = 130; |
| static const unsigned int kMajorBlockScsiL = 131; |
| static const unsigned int kMajorBlockScsiM = 132; |
| static const unsigned int kMajorBlockScsiN = 133; |
| static const unsigned int kMajorBlockScsiO = 134; |
| static const unsigned int kMajorBlockScsiP = 135; |
| static const unsigned int kMajorBlockMmc = 179; |
| static const unsigned int kMajorBlockDynamicMin = 234; |
| static const unsigned int kMajorBlockDynamicMax = 512; |
| |
| static const char* kGptBasicData = "EBD0A0A2-B9E5-4433-87C0-68B6B72699C7"; |
| static const char* kGptAndroidMeta = "19A710A2-B3CA-11E4-B026-10604B889DCF"; |
| static const char* kGptAndroidExpand = "193D1EA4-B3CA-11E4-B075-10604B889DCF"; |
| |
| enum class Table { |
| kUnknown, |
| kMbr, |
| kGpt, |
| }; |
| |
| static bool isNvmeBlkDevice(unsigned int major, const std::string& sysPath) { |
| return sysPath.find("nvme") != std::string::npos && major >= kMajorBlockDynamicMin && |
| major <= kMajorBlockDynamicMax; |
| } |
| |
| Disk::Disk(const std::string& eventPath, dev_t device, const std::string& nickname, int flags) |
| : mDevice(device), |
| mSize(-1), |
| mNickname(nickname), |
| mFlags(flags), |
| mCreated(false), |
| mJustPartitioned(false) { |
| mId = StringPrintf("disk:%u,%u", major(device), minor(device)); |
| mEventPath = eventPath; |
| mSysPath = StringPrintf("/sys/%s", eventPath.c_str()); |
| mDevPath = StringPrintf("/dev/block/vold/%s", mId.c_str()); |
| CreateDeviceNode(mDevPath, mDevice); |
| } |
| |
| Disk::~Disk() { |
| CHECK(!mCreated); |
| DestroyDeviceNode(mDevPath); |
| } |
| |
| std::shared_ptr<VolumeBase> Disk::findVolume(const std::string& id) { |
| for (auto vol : mVolumes) { |
| if (vol->getId() == id) { |
| return vol; |
| } |
| auto stackedVol = vol->findVolume(id); |
| if (stackedVol != nullptr) { |
| return stackedVol; |
| } |
| } |
| return nullptr; |
| } |
| |
| void Disk::listVolumes(VolumeBase::Type type, std::list<std::string>& list) const { |
| for (const auto& vol : mVolumes) { |
| if (vol->getType() == type) { |
| list.push_back(vol->getId()); |
| } |
| // TODO: consider looking at stacked volumes |
| } |
| } |
| |
| std::vector<std::shared_ptr<VolumeBase>> Disk::getVolumes() const { |
| std::vector<std::shared_ptr<VolumeBase>> vols; |
| for (const auto& vol : mVolumes) { |
| vols.push_back(vol); |
| auto stackedVolumes = vol->getVolumes(); |
| vols.insert(vols.end(), stackedVolumes.begin(), stackedVolumes.end()); |
| } |
| |
| return vols; |
| } |
| |
| status_t Disk::create() { |
| CHECK(!mCreated); |
| mCreated = true; |
| |
| auto listener = VolumeManager::Instance()->getListener(); |
| if (listener) listener->onDiskCreated(getId(), mFlags); |
| |
| if (isStub()) { |
| createStubVolume(); |
| return OK; |
| } |
| readMetadata(); |
| readPartitions(); |
| return OK; |
| } |
| |
| status_t Disk::destroy() { |
| CHECK(mCreated); |
| destroyAllVolumes(); |
| mCreated = false; |
| |
| auto listener = VolumeManager::Instance()->getListener(); |
| if (listener) listener->onDiskDestroyed(getId()); |
| |
| return OK; |
| } |
| |
| void Disk::createPublicVolume(dev_t device) { |
| auto vol = std::shared_ptr<VolumeBase>(new PublicVolume(device)); |
| if (mJustPartitioned) { |
| LOG(DEBUG) << "Device just partitioned; silently formatting"; |
| vol->setSilent(true); |
| vol->create(); |
| vol->format("auto"); |
| vol->destroy(); |
| vol->setSilent(false); |
| } |
| |
| mVolumes.push_back(vol); |
| vol->setDiskId(getId()); |
| vol->create(); |
| } |
| |
| void Disk::createPrivateVolume(dev_t device, const std::string& partGuid) { |
| std::string normalizedGuid; |
| if (NormalizeHex(partGuid, normalizedGuid)) { |
| LOG(WARNING) << "Invalid GUID " << partGuid; |
| return; |
| } |
| |
| std::string keyRaw; |
| if (!ReadFileToString(BuildKeyPath(normalizedGuid), &keyRaw)) { |
| PLOG(ERROR) << "Failed to load key for GUID " << normalizedGuid; |
| return; |
| } |
| |
| LOG(DEBUG) << "Found key for GUID " << normalizedGuid; |
| |
| auto keyBuffer = KeyBuffer(keyRaw.begin(), keyRaw.end()); |
| auto vol = std::shared_ptr<VolumeBase>(new PrivateVolume(device, keyBuffer)); |
| if (mJustPartitioned) { |
| LOG(DEBUG) << "Device just partitioned; silently formatting"; |
| vol->setSilent(true); |
| vol->create(); |
| vol->format("auto"); |
| vol->destroy(); |
| vol->setSilent(false); |
| } |
| |
| mVolumes.push_back(vol); |
| vol->setDiskId(getId()); |
| vol->setPartGuid(partGuid); |
| vol->create(); |
| } |
| |
| void Disk::createStubVolume() { |
| CHECK(mVolumes.size() == 1); |
| auto listener = VolumeManager::Instance()->getListener(); |
| if (listener) listener->onDiskMetadataChanged(getId(), mSize, mLabel, mSysPath); |
| if (listener) listener->onDiskScanned(getId()); |
| mVolumes[0]->setDiskId(getId()); |
| mVolumes[0]->create(); |
| } |
| |
| void Disk::destroyAllVolumes() { |
| for (const auto& vol : mVolumes) { |
| vol->destroy(); |
| } |
| mVolumes.clear(); |
| } |
| |
| status_t Disk::readMetadata() { |
| mSize = -1; |
| mLabel.clear(); |
| |
| if (GetBlockDevSize(mDevPath, &mSize) != OK) { |
| mSize = -1; |
| } |
| |
| unsigned int majorId = major(mDevice); |
| switch (majorId) { |
| case kMajorBlockLoop: { |
| mLabel = "Virtual"; |
| break; |
| } |
| // clang-format off |
| case kMajorBlockScsiA: case kMajorBlockScsiB: case kMajorBlockScsiC: |
| case kMajorBlockScsiD: case kMajorBlockScsiE: case kMajorBlockScsiF: |
| case kMajorBlockScsiG: case kMajorBlockScsiH: case kMajorBlockScsiI: |
| case kMajorBlockScsiJ: case kMajorBlockScsiK: case kMajorBlockScsiL: |
| case kMajorBlockScsiM: case kMajorBlockScsiN: case kMajorBlockScsiO: |
| case kMajorBlockScsiP: { |
| // clang-format on |
| std::string path(mSysPath + "/device/vendor"); |
| std::string tmp; |
| if (!ReadFileToString(path, &tmp)) { |
| PLOG(WARNING) << "Failed to read vendor from " << path; |
| return -errno; |
| } |
| tmp = android::base::Trim(tmp); |
| mLabel = tmp; |
| break; |
| } |
| case kMajorBlockMmc: { |
| std::string path(mSysPath + "/device/manfid"); |
| std::string tmp; |
| if (!ReadFileToString(path, &tmp)) { |
| PLOG(WARNING) << "Failed to read manufacturer from " << path; |
| return -errno; |
| } |
| tmp = android::base::Trim(tmp); |
| int64_t manfid; |
| if (!android::base::ParseInt(tmp, &manfid)) { |
| PLOG(WARNING) << "Failed to parse manufacturer " << tmp; |
| return -EINVAL; |
| } |
| // Our goal here is to give the user a meaningful label, ideally |
| // matching whatever is silk-screened on the card. To reduce |
| // user confusion, this list doesn't contain white-label manfid. |
| switch (manfid) { |
| // clang-format off |
| case 0x000003: mLabel = "SanDisk"; break; |
| case 0x00001b: mLabel = "Samsung"; break; |
| case 0x000028: mLabel = "Lexar"; break; |
| case 0x000074: mLabel = "Transcend"; break; |
| // clang-format on |
| } |
| break; |
| } |
| default: { |
| if (IsVirtioBlkDevice(majorId)) { |
| LOG(DEBUG) << "Recognized experimental block major ID " << majorId |
| << " as virtio-blk (emulator's virtual SD card device)"; |
| mLabel = "Virtual"; |
| break; |
| } |
| if (isNvmeBlkDevice(majorId, mSysPath)) { |
| std::string path(mSysPath + "/device/model"); |
| std::string tmp; |
| if (!ReadFileToString(path, &tmp)) { |
| PLOG(WARNING) << "Failed to read vendor from " << path; |
| return -errno; |
| } |
| mLabel = tmp; |
| break; |
| } |
| LOG(WARNING) << "Unsupported block major type " << majorId; |
| return -ENOTSUP; |
| } |
| } |
| |
| auto listener = VolumeManager::Instance()->getListener(); |
| if (listener) listener->onDiskMetadataChanged(getId(), mSize, mLabel, mSysPath); |
| |
| return OK; |
| } |
| |
| status_t Disk::readPartitions() { |
| int maxMinors = getMaxMinors(); |
| if (maxMinors < 0) { |
| return -ENOTSUP; |
| } |
| |
| destroyAllVolumes(); |
| |
| // Parse partition table |
| |
| std::vector<std::string> cmd; |
| cmd.push_back(kSgdiskPath); |
| cmd.push_back("--android-dump"); |
| cmd.push_back(mDevPath); |
| |
| std::vector<std::string> output; |
| status_t res = ForkExecvp(cmd, &output); |
| if (res != OK) { |
| LOG(WARNING) << "sgdisk failed to scan " << mDevPath; |
| |
| auto listener = VolumeManager::Instance()->getListener(); |
| if (listener) listener->onDiskScanned(getId()); |
| |
| mJustPartitioned = false; |
| return res; |
| } |
| |
| Table table = Table::kUnknown; |
| bool foundParts = false; |
| for (const auto& line : output) { |
| auto split = android::base::Split(line, kSgdiskToken); |
| auto it = split.begin(); |
| if (it == split.end()) continue; |
| |
| if (*it == "DISK") { |
| if (++it == split.end()) continue; |
| if (*it == "mbr") { |
| table = Table::kMbr; |
| } else if (*it == "gpt") { |
| table = Table::kGpt; |
| } else { |
| LOG(WARNING) << "Invalid partition table " << *it; |
| continue; |
| } |
| } else if (*it == "PART") { |
| |
| if (++it == split.end()) continue; |
| int i = 0; |
| if (!android::base::ParseInt(*it, &i, 1, maxMinors)) { |
| LOG(WARNING) << "Invalid partition number " << *it; |
| continue; |
| } |
| dev_t partDevice = makedev(major(mDevice), minor(mDevice) + i); |
| |
| if (table == Table::kMbr) { |
| if (++it == split.end()) continue; |
| int type = 0; |
| if (!android::base::ParseInt("0x" + *it, &type)) { |
| LOG(WARNING) << "Invalid partition type " << *it; |
| continue; |
| } |
| |
| switch (type) { |
| case 0x06: // FAT16 |
| case 0x07: // HPFS/NTFS/exFAT |
| case 0x0b: // W95 FAT32 (LBA) |
| case 0x0c: // W95 FAT32 (LBA) |
| case 0x0e: // W95 FAT16 (LBA) |
| createPublicVolume(partDevice); |
| foundParts = true; |
| break; |
| } |
| } else if (table == Table::kGpt) { |
| if (++it == split.end()) continue; |
| auto typeGuid = *it; |
| if (++it == split.end()) continue; |
| auto partGuid = *it; |
| |
| if (android::base::EqualsIgnoreCase(typeGuid, kGptBasicData)) { |
| createPublicVolume(partDevice); |
| foundParts = true; |
| } else if (android::base::EqualsIgnoreCase(typeGuid, kGptAndroidExpand)) { |
| createPrivateVolume(partDevice, partGuid); |
| foundParts = true; |
| } |
| } |
| } |
| } |
| |
| // Ugly last ditch effort, treat entire disk as partition |
| if (table == Table::kUnknown || !foundParts) { |
| LOG(WARNING) << mId << " has unknown partition table; trying entire device"; |
| |
| std::string fsType; |
| std::string unused; |
| if (ReadMetadataUntrusted(mDevPath, &fsType, &unused, &unused) == OK) { |
| createPublicVolume(mDevice); |
| } else { |
| LOG(WARNING) << mId << " failed to identify, giving up"; |
| } |
| } |
| |
| auto listener = VolumeManager::Instance()->getListener(); |
| if (listener) listener->onDiskScanned(getId()); |
| |
| mJustPartitioned = false; |
| return OK; |
| } |
| |
| void Disk::initializePartition(std::shared_ptr<StubVolume> vol) { |
| CHECK(isStub()); |
| CHECK(mVolumes.empty()); |
| mVolumes.push_back(vol); |
| } |
| |
| status_t Disk::unmountAll() { |
| for (const auto& vol : mVolumes) { |
| vol->unmount(); |
| } |
| return OK; |
| } |
| |
| status_t Disk::partitionPublic() { |
| int res; |
| |
| destroyAllVolumes(); |
| mJustPartitioned = true; |
| |
| // First nuke any existing partition table |
| std::vector<std::string> cmd; |
| cmd.push_back(kSgdiskPath); |
| cmd.push_back("--zap-all"); |
| cmd.push_back(mDevPath); |
| |
| // Zap sometimes returns an error when it actually succeeded, so |
| // just log as warning and keep rolling forward. |
| if ((res = ForkExecvp(cmd)) != 0) { |
| LOG(WARNING) << "Failed to zap; status " << res; |
| } |
| |
| // Now let's build the new MBR table. We heavily rely on sgdisk to |
| // force optimal alignment on the created partitions. |
| cmd.clear(); |
| cmd.push_back(kSgdiskPath); |
| cmd.push_back("--new=0:0:-0"); |
| cmd.push_back("--typecode=0:0c00"); |
| cmd.push_back("--gpttombr=1"); |
| cmd.push_back(mDevPath); |
| |
| if ((res = ForkExecvp(cmd)) != 0) { |
| LOG(ERROR) << "Failed to partition; status " << res; |
| return res; |
| } |
| |
| return OK; |
| } |
| |
| status_t Disk::partitionPrivate() { |
| return partitionMixed(0); |
| } |
| |
| status_t Disk::partitionMixed(int8_t ratio) { |
| int res; |
| |
| destroyAllVolumes(); |
| mJustPartitioned = true; |
| |
| // First nuke any existing partition table |
| std::vector<std::string> cmd; |
| cmd.push_back(kSgdiskPath); |
| cmd.push_back("--zap-all"); |
| cmd.push_back(mDevPath); |
| |
| // Zap sometimes returns an error when it actually succeeded, so |
| // just log as warning and keep rolling forward. |
| if ((res = ForkExecvp(cmd)) != 0) { |
| LOG(WARNING) << "Failed to zap; status " << res; |
| } |
| |
| // We've had some success above, so generate both the private partition |
| // GUID and encryption key and persist them. |
| std::string partGuidRaw; |
| if (GenerateRandomUuid(partGuidRaw) != OK) { |
| LOG(ERROR) << "Failed to generate GUID"; |
| return -EIO; |
| } |
| |
| KeyBuffer key; |
| if (!generate_volume_key(&key)) { |
| LOG(ERROR) << "Failed to generate key"; |
| return -EIO; |
| } |
| std::string keyRaw(key.begin(), key.end()); |
| |
| std::string partGuid; |
| StrToHex(partGuidRaw, partGuid); |
| |
| if (!WriteStringToFile(keyRaw, BuildKeyPath(partGuid))) { |
| LOG(ERROR) << "Failed to persist key"; |
| return -EIO; |
| } else { |
| LOG(DEBUG) << "Persisted key for GUID " << partGuid; |
| } |
| |
| // Now let's build the new GPT table. We heavily rely on sgdisk to |
| // force optimal alignment on the created partitions. |
| cmd.clear(); |
| cmd.push_back(kSgdiskPath); |
| |
| // If requested, create a public partition first. Mixed-mode partitioning |
| // like this is an experimental feature. |
| if (ratio > 0) { |
| if (ratio < 10 || ratio > 90) { |
| LOG(ERROR) << "Mixed partition ratio must be between 10-90%"; |
| return -EINVAL; |
| } |
| |
| uint64_t splitMb = ((mSize / 100) * ratio) / 1024 / 1024; |
| cmd.push_back(StringPrintf("--new=0:0:+%" PRId64 "M", splitMb)); |
| cmd.push_back(StringPrintf("--typecode=0:%s", kGptBasicData)); |
| cmd.push_back("--change-name=0:shared"); |
| } |
| |
| // Define a metadata partition which is designed for future use; there |
| // should only be one of these per physical device, even if there are |
| // multiple private volumes. |
| cmd.push_back("--new=0:0:+16M"); |
| cmd.push_back(StringPrintf("--typecode=0:%s", kGptAndroidMeta)); |
| cmd.push_back("--change-name=0:android_meta"); |
| |
| // Define a single private partition filling the rest of disk. |
| cmd.push_back("--new=0:0:-0"); |
| cmd.push_back(StringPrintf("--typecode=0:%s", kGptAndroidExpand)); |
| cmd.push_back(StringPrintf("--partition-guid=0:%s", partGuid.c_str())); |
| cmd.push_back("--change-name=0:android_expand"); |
| |
| cmd.push_back(mDevPath); |
| |
| if ((res = ForkExecvp(cmd)) != 0) { |
| LOG(ERROR) << "Failed to partition; status " << res; |
| return res; |
| } |
| |
| return OK; |
| } |
| |
| int Disk::getMaxMinors() { |
| // Figure out maximum partition devices supported |
| unsigned int majorId = major(mDevice); |
| switch (majorId) { |
| case kMajorBlockLoop: { |
| std::string tmp; |
| if (!ReadFileToString(kSysfsLoopMaxMinors, &tmp)) { |
| LOG(ERROR) << "Failed to read max minors"; |
| return -errno; |
| } |
| return std::stoi(tmp); |
| } |
| // clang-format off |
| case kMajorBlockScsiA: case kMajorBlockScsiB: case kMajorBlockScsiC: |
| case kMajorBlockScsiD: case kMajorBlockScsiE: case kMajorBlockScsiF: |
| case kMajorBlockScsiG: case kMajorBlockScsiH: case kMajorBlockScsiI: |
| case kMajorBlockScsiJ: case kMajorBlockScsiK: case kMajorBlockScsiL: |
| case kMajorBlockScsiM: case kMajorBlockScsiN: case kMajorBlockScsiO: |
| case kMajorBlockScsiP: { |
| // clang-format on |
| // Per Documentation/devices.txt this is static |
| return 15; |
| } |
| case kMajorBlockMmc: { |
| // Per Documentation/devices.txt this is dynamic |
| std::string tmp; |
| if (!ReadFileToString(kSysfsMmcMaxMinors, &tmp) && |
| !ReadFileToString(kSysfsMmcMaxMinorsDeprecated, &tmp)) { |
| LOG(ERROR) << "Failed to read max minors"; |
| return -errno; |
| } |
| return std::stoi(tmp); |
| } |
| default: { |
| if (IsVirtioBlkDevice(majorId)) { |
| // drivers/block/virtio_blk.c has "#define PART_BITS 4", so max is |
| // 2^4 - 1 = 15 |
| return 15; |
| } |
| if (isNvmeBlkDevice(majorId, mSysPath)) { |
| // despite kernel nvme driver supports up to 1M minors, |
| // #define NVME_MINORS (1U << MINORBITS) |
| // sgdisk can not support more than 127 partitions, due to |
| // #define MAX_MBR_PARTS 128 |
| return 127; |
| } |
| } |
| } |
| |
| LOG(ERROR) << "Unsupported block major type " << majorId; |
| return -ENOTSUP; |
| } |
| |
| } // namespace vold |
| } // namespace android |
