| /* |
| * Copyright (C) 2018 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. |
| */ |
| |
| #define LOG_TAG "apexd" |
| |
| #include "apexd.h" |
| #include "apexd_private.h" |
| |
| #include "apex_database.h" |
| #include "apex_file.h" |
| #include "apex_manifest.h" |
| #include "apexd_prepostinstall.h" |
| #include "apexd_session.h" |
| #include "status_or.h" |
| #include "string_log.h" |
| |
| #include <android-base/file.h> |
| #include <android-base/logging.h> |
| #include <android-base/macros.h> |
| #include <android-base/properties.h> |
| #include <android-base/scopeguard.h> |
| #include <android-base/stringprintf.h> |
| #include <android-base/strings.h> |
| #include <android-base/unique_fd.h> |
| #include <libavb/libavb.h> |
| #include <libdm/dm.h> |
| #include <libdm/dm_table.h> |
| #include <libdm/dm_target.h> |
| #include <selinux/android.h> |
| |
| #include <dirent.h> |
| #include <fcntl.h> |
| #include <linux/loop.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/mount.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include <algorithm> |
| #include <array> |
| #include <fstream> |
| #include <iomanip> |
| #include <memory> |
| #include <string> |
| |
| using android::base::EndsWith; |
| using android::base::ReadFullyAtOffset; |
| using android::base::StartsWith; |
| using android::base::StringPrintf; |
| using android::base::unique_fd; |
| using android::dm::DeviceMapper; |
| using android::dm::DmDeviceState; |
| using android::dm::DmTable; |
| using android::dm::DmTargetVerity; |
| |
| using apex::proto::SessionState; |
| |
| namespace android { |
| namespace apex { |
| |
| using MountedApexData = MountedApexDatabase::MountedApexData; |
| |
| namespace { |
| |
| static constexpr const char* kApexPackageSuffix = ".apex"; |
| static constexpr const char* kApexLoopIdPrefix = "apex:"; |
| static constexpr const char* kApexKeySystemDirectory = |
| "/system/etc/security/apex/"; |
| static constexpr const char* kApexKeyProductDirectory = |
| "/product/etc/security/apex/"; |
| |
| // 128 kB read-ahead, which we currently use for /system as well |
| static constexpr const char* kReadAheadKb = "128"; |
| |
| // These should be in-sync with system/sepolicy/public/property_contexts |
| static constexpr const char* kApexStatusSysprop = "apexd.status"; |
| static constexpr const char* kApexStatusStarting = "starting"; |
| static constexpr const char* kApexStatusReady = "ready"; |
| |
| static constexpr const char* kApexVerityOnSystemProp = |
| "persist.apexd.verity_on_system"; |
| static bool gForceDmVerityOnSystem = |
| android::base::GetBoolProperty(kApexVerityOnSystemProp, false); |
| |
| MountedApexDatabase gMountedApexes; |
| |
| struct LoopbackDeviceUniqueFd { |
| unique_fd device_fd; |
| std::string name; |
| |
| LoopbackDeviceUniqueFd() {} |
| LoopbackDeviceUniqueFd(unique_fd&& fd, const std::string& name) |
| : device_fd(std::move(fd)), name(name) {} |
| |
| LoopbackDeviceUniqueFd(LoopbackDeviceUniqueFd&& fd) noexcept |
| : device_fd(std::move(fd.device_fd)), name(fd.name) {} |
| LoopbackDeviceUniqueFd& operator=(LoopbackDeviceUniqueFd&& other) noexcept { |
| MaybeCloseBad(); |
| device_fd = std::move(other.device_fd); |
| name = std::move(other.name); |
| return *this; |
| } |
| |
| ~LoopbackDeviceUniqueFd() { MaybeCloseBad(); } |
| |
| void MaybeCloseBad() { |
| if (device_fd.get() != -1) { |
| // Disassociate any files. |
| if (ioctl(device_fd.get(), LOOP_CLR_FD) == -1) { |
| PLOG(ERROR) << "Unable to clear fd for loopback device"; |
| } |
| } |
| } |
| |
| void CloseGood() { device_fd.reset(-1); } |
| |
| int get() { return device_fd.get(); } |
| }; |
| |
| Status configureReadAhead(const std::string& device_path) { |
| auto pos = device_path.find("/dev/block/"); |
| if (pos != 0) { |
| return Status::Fail(StringLog() |
| << "Device path does not start with /dev/block."); |
| } |
| pos = device_path.find_last_of("/"); |
| std::string device_name = device_path.substr(pos + 1, std::string::npos); |
| |
| std::string sysfs_device = |
| StringPrintf("/sys/block/%s/queue/read_ahead_kb", device_name.c_str()); |
| unique_fd sysfs_fd(open(sysfs_device.c_str(), O_RDWR | O_CLOEXEC)); |
| if (sysfs_fd.get() == -1) { |
| return Status::Fail(PStringLog() << "Failed to open " << sysfs_device); |
| } |
| |
| int ret = TEMP_FAILURE_RETRY( |
| write(sysfs_fd.get(), kReadAheadKb, strlen(kReadAheadKb) + 1)); |
| if (ret < 0) { |
| return Status::Fail(PStringLog() << "Failed to write to " << sysfs_device); |
| } |
| |
| return Status::Success(); |
| } |
| |
| StatusOr<LoopbackDeviceUniqueFd> createLoopDevice(const std::string& target, |
| const int32_t imageOffset, |
| const size_t imageSize) { |
| using Failed = StatusOr<LoopbackDeviceUniqueFd>; |
| unique_fd ctl_fd(open("/dev/loop-control", O_RDWR | O_CLOEXEC)); |
| if (ctl_fd.get() == -1) { |
| return Failed::MakeError(PStringLog() << "Failed to open loop-control"); |
| } |
| |
| int num = ioctl(ctl_fd.get(), LOOP_CTL_GET_FREE); |
| if (num == -1) { |
| return Failed::MakeError(PStringLog() << "Failed LOOP_CTL_GET_FREE"); |
| } |
| |
| std::string device = StringPrintf("/dev/block/loop%d", num); |
| |
| unique_fd target_fd(open(target.c_str(), O_RDONLY | O_CLOEXEC)); |
| if (target_fd.get() == -1) { |
| return Failed::MakeError(PStringLog() << "Failed to open " << target); |
| } |
| LoopbackDeviceUniqueFd device_fd( |
| unique_fd(open(device.c_str(), O_RDWR | O_CLOEXEC)), device); |
| if (device_fd.get() == -1) { |
| return Failed::MakeError(PStringLog() << "Failed to open " << device); |
| } |
| |
| if (ioctl(device_fd.get(), LOOP_SET_FD, target_fd.get()) == -1) { |
| return Failed::MakeError(PStringLog() << "Failed to LOOP_SET_FD"); |
| } |
| |
| struct loop_info64 li; |
| memset(&li, 0, sizeof(li)); |
| strlcpy((char*)li.lo_crypt_name, kApexLoopIdPrefix, LO_NAME_SIZE); |
| li.lo_offset = imageOffset; |
| li.lo_sizelimit = imageSize; |
| if (ioctl(device_fd.get(), LOOP_SET_STATUS64, &li) == -1) { |
| return Failed::MakeError(PStringLog() << "Failed to LOOP_SET_STATUS64"); |
| } |
| |
| if (ioctl(device_fd.get(), BLKFLSBUF, 0) == -1) { |
| // This works around a kernel bug where the following happens. |
| // 1) The device runs with a value of loop.max_part > 0 |
| // 2) As part of LOOP_SET_FD above, we do a partition scan, which loads |
| // the first 2 pages of the underlying file into the buffer cache |
| // 3) When we then change the offset with LOOP_SET_STATUS64, those pages |
| // are not invalidated from the cache. |
| // 4) When we try to mount an ext4 filesystem on the loop device, the ext4 |
| // code will try to find a superblock by reading 4k at offset 0; but, |
| // because we still have the old pages at offset 0 lying in the cache, |
| // those pages will be returned directly. However, those pages contain |
| // the data at offset 0 in the underlying file, not at the offset that |
| // we configured |
| // 5) the ext4 driver fails to find a superblock in the (wrong) data, and |
| // fails to mount the filesystem. |
| // |
| // To work around this, explicitly flush the block device, which will flush |
| // the buffer cache and make sure we actually read the data at the correct |
| // offset. |
| return Failed::MakeError(PStringLog() |
| << "Failed to flush buffers on the loop device."); |
| } |
| |
| // Direct-IO requires the loop device to have the same block size as the |
| // underlying filesystem. |
| if (ioctl(device_fd.get(), LOOP_SET_BLOCK_SIZE, 4096) == -1) { |
| PLOG(WARNING) << "Failed to LOOP_SET_BLOCK_SIZE"; |
| } else { |
| if (ioctl(device_fd.get(), LOOP_SET_DIRECT_IO, 1) == -1) { |
| PLOG(WARNING) << "Failed to LOOP_SET_DIRECT_IO"; |
| // TODO Eventually we'll want to fail on this; right now we can't because |
| // not all devices have the necessary kernel patches. |
| } |
| } |
| |
| Status readAheadStatus = configureReadAhead(device); |
| if (!readAheadStatus.Ok()) { |
| return Failed::MakeError(StringLog() << readAheadStatus.ErrorMessage()); |
| } |
| return StatusOr<LoopbackDeviceUniqueFd>(std::move(device_fd)); |
| } |
| |
| template <typename T> |
| void DestroyLoopDevice(const std::string& path, T extra) { |
| unique_fd fd(open(path.c_str(), O_RDWR | O_CLOEXEC)); |
| if (fd.get() == -1) { |
| if (errno != ENOENT) { |
| PLOG(WARNING) << "Failed to open " << path; |
| } |
| return; |
| } |
| |
| struct loop_info64 li; |
| if (ioctl(fd.get(), LOOP_GET_STATUS64, &li) < 0) { |
| if (errno != ENXIO) { |
| PLOG(WARNING) << "Failed to LOOP_GET_STATUS64 " << path; |
| } |
| return; |
| } |
| |
| auto id = std::string((char*)li.lo_crypt_name); |
| if (android::base::StartsWith(id, kApexLoopIdPrefix)) { |
| extra(path, id); |
| |
| if (ioctl(fd.get(), LOOP_CLR_FD, 0) < 0) { |
| PLOG(WARNING) << "Failed to LOOP_CLR_FD " << path; |
| } |
| } |
| } |
| |
| void destroyAllLoopDevices() { |
| std::string root = "/dev/block/"; |
| auto dirp = |
| std::unique_ptr<DIR, int (*)(DIR*)>(opendir(root.c_str()), closedir); |
| if (!dirp) { |
| PLOG(ERROR) << "Failed to open /dev/block/, can't destroy loop devices."; |
| return; |
| } |
| |
| // Poke through all devices looking for loop devices. |
| auto log_fn = [](const std::string& path, const std::string& id) { |
| LOG(DEBUG) << "Tearing down stale loop device at " << path << " named " |
| << id; |
| }; |
| struct dirent* de; |
| while ((de = readdir(dirp.get()))) { |
| auto test = std::string(de->d_name); |
| if (!android::base::StartsWith(test, "loop")) continue; |
| |
| auto path = root + de->d_name; |
| DestroyLoopDevice(path, log_fn); |
| } |
| } |
| |
| static constexpr size_t kLoopDeviceSetupAttempts = 3u; |
| static constexpr size_t kMountAttempts = 5u; |
| |
| std::unique_ptr<DmTable> createVerityTable(const ApexVerityData& verity_data, |
| const std::string& loop) { |
| AvbHashtreeDescriptor* desc = verity_data.desc.get(); |
| auto table = std::make_unique<DmTable>(); |
| |
| std::ostringstream hash_algorithm; |
| hash_algorithm << desc->hash_algorithm; |
| |
| auto target = std::make_unique<DmTargetVerity>( |
| 0, desc->image_size / 512, desc->dm_verity_version, loop, loop, |
| desc->data_block_size, desc->hash_block_size, |
| desc->image_size / desc->data_block_size, |
| desc->tree_offset / desc->hash_block_size, hash_algorithm.str(), |
| verity_data.root_digest, verity_data.salt); |
| |
| target->IgnoreZeroBlocks(); |
| table->AddTarget(std::move(target)); |
| |
| table->set_readonly(true); |
| |
| return table; |
| } |
| |
| class DmVerityDevice { |
| public: |
| DmVerityDevice() : cleared_(true) {} |
| explicit DmVerityDevice(const std::string& name) |
| : name_(name), cleared_(false) {} |
| DmVerityDevice(const std::string& name, const std::string& dev_path) |
| : name_(name), dev_path_(dev_path), cleared_(false) {} |
| |
| DmVerityDevice(DmVerityDevice&& other) |
| : name_(other.name_), |
| dev_path_(other.dev_path_), |
| cleared_(other.cleared_) { |
| other.cleared_ = true; |
| } |
| |
| DmVerityDevice& operator=(DmVerityDevice&& other) { |
| name_ = other.name_; |
| dev_path_ = other.dev_path_; |
| cleared_ = other.cleared_; |
| other.cleared_ = true; |
| return *this; |
| } |
| |
| ~DmVerityDevice() { |
| if (!cleared_) { |
| DeviceMapper& dm = DeviceMapper::Instance(); |
| dm.DeleteDevice(name_); |
| } |
| } |
| |
| const std::string& GetName() const { return name_; } |
| const std::string& GetDevPath() const { return dev_path_; } |
| void SetDevPath(const std::string& dev_path) { dev_path_ = dev_path; } |
| |
| void Release() { cleared_ = true; } |
| |
| private: |
| std::string name_; |
| std::string dev_path_; |
| bool cleared_; |
| }; |
| |
| StatusOr<DmVerityDevice> createVerityDevice(const std::string& name, |
| const DmTable& table) { |
| DeviceMapper& dm = DeviceMapper::Instance(); |
| |
| if (dm.GetState(name) != DmDeviceState::INVALID) { |
| LOG(WARNING) << "Deleting existing dm device " << name; |
| dm.DeleteDevice(name); |
| } |
| |
| if (!dm.CreateDevice(name, table)) { |
| return StatusOr<DmVerityDevice>::MakeError( |
| "Couldn't create verity device."); |
| } |
| DmVerityDevice dev(name); |
| |
| std::string dev_path; |
| if (!dm.GetDmDevicePathByName(name, &dev_path)) { |
| return StatusOr<DmVerityDevice>::MakeError( |
| "Couldn't get verity device path!"); |
| } |
| dev.SetDevPath(dev_path); |
| |
| return StatusOr<DmVerityDevice>(std::move(dev)); |
| } |
| |
| template <typename FilterFn> |
| StatusOr<std::vector<std::string>> ReadDir(const std::string& path, |
| FilterFn fn) { |
| // This code would be much shorter if C++17's std::filesystem were available, |
| // which is not at the time of writing this. |
| auto d = std::unique_ptr<DIR, int (*)(DIR*)>(opendir(path.c_str()), closedir); |
| if (!d) { |
| return StatusOr<std::vector<std::string>>::MakeError( |
| PStringLog() << "Can't open " << path << " for reading."); |
| } |
| |
| std::vector<std::string> ret; |
| struct dirent* dp; |
| while ((dp = readdir(d.get())) != NULL) { |
| if ((strcmp(dp->d_name, ".") == 0) || (strcmp(dp->d_name, "..") == 0)) { |
| continue; |
| } |
| if (!fn(dp->d_type, dp->d_name)) { |
| continue; |
| } |
| ret.push_back(path + "/" + dp->d_name); |
| } |
| |
| return StatusOr<std::vector<std::string>>(std::move(ret)); |
| } |
| |
| template <char kTypeVal> |
| bool DTypeFilter(unsigned char d_type, const char* d_name ATTRIBUTE_UNUSED) { |
| return d_type == kTypeVal; |
| } |
| |
| StatusOr<std::vector<std::string>> FindApexFilesByName(const std::string& path, |
| bool include_dirs) { |
| auto filter_fn = [include_dirs](unsigned char d_type, const char* d_name) { |
| if (d_type == DT_REG && EndsWith(d_name, kApexPackageSuffix)) { |
| return true; // APEX file, take. |
| } |
| // Directory and asked to scan for flattened. |
| return d_type == DT_DIR && include_dirs; |
| }; |
| return ReadDir(path, filter_fn); |
| } |
| |
| Status mountNonFlattened(const ApexFile& apex, const std::string& mountPoint, |
| MountedApexData* apex_data) { |
| const ApexManifest& manifest = apex.GetManifest(); |
| const std::string& full_path = apex.GetPath(); |
| const std::string& packageId = manifest.GetPackageId(); |
| |
| LoopbackDeviceUniqueFd loopbackDevice; |
| for (size_t attempts = 1;; ++attempts) { |
| StatusOr<LoopbackDeviceUniqueFd> ret = |
| createLoopDevice(full_path, apex.GetImageOffset(), apex.GetImageSize()); |
| if (ret.Ok()) { |
| loopbackDevice = std::move(*ret); |
| break; |
| } |
| if (attempts >= kLoopDeviceSetupAttempts) { |
| return Status::Fail(StringLog() |
| << "Could not create loop device for " << full_path |
| << ": " << ret.ErrorMessage()); |
| } |
| } |
| LOG(VERBOSE) << "Loopback device created: " << loopbackDevice.name; |
| |
| auto verityData = apex.VerifyApexVerity( |
| {kApexKeySystemDirectory, kApexKeyProductDirectory}); |
| if (!verityData.Ok()) { |
| return Status(StringLog() |
| << "Failed to verify Apex Verity data for " << full_path |
| << ": " << verityData.ErrorMessage()); |
| } |
| std::string blockDevice = loopbackDevice.name; |
| apex_data->loop_name = loopbackDevice.name; |
| |
| // for APEXes in system partition, we don't need to mount them on dm-verity |
| // because they are already in the dm-verity protected partition; system. |
| // However, note that we don't skip verification to ensure that APEXes are |
| // correctly signed. |
| const bool mountOnVerity = |
| gForceDmVerityOnSystem || |
| !android::base::StartsWith(full_path, kApexPackageSystemDir); |
| DmVerityDevice verityDev; |
| if (mountOnVerity) { |
| auto verityTable = createVerityTable(*verityData, loopbackDevice.name); |
| StatusOr<DmVerityDevice> verityDevRes = |
| createVerityDevice(packageId, *verityTable); |
| if (!verityDevRes.Ok()) { |
| return Status(StringLog() |
| << "Failed to create Apex Verity device " << full_path |
| << ": " << verityDevRes.ErrorMessage()); |
| } |
| verityDev = std::move(*verityDevRes); |
| blockDevice = verityDev.GetDevPath(); |
| |
| Status readAheadStatus = configureReadAhead(verityDev.GetDevPath()); |
| if (!readAheadStatus.Ok()) { |
| return readAheadStatus; |
| } |
| } |
| |
| for (size_t count = 0; count < kMountAttempts; ++count) { |
| if (mount(blockDevice.c_str(), mountPoint.c_str(), "ext4", |
| MS_NOATIME | MS_NODEV | MS_DIRSYNC | MS_RDONLY, NULL) == 0) { |
| LOG(INFO) << "Successfully mounted package " << full_path << " on " |
| << mountPoint; |
| |
| // Time to accept the temporaries as good. |
| if (mountOnVerity) { |
| verityDev.Release(); |
| } |
| loopbackDevice.CloseGood(); |
| |
| return Status::Success(); |
| } else { |
| // TODO(b/122059364): Even though the kernel has created the verity |
| // device, we still depend on ueventd to run to actually create the |
| // device node in userspace. To solve this properly we should listen on |
| // the netlink socket for uevents, or use inotify. For now, this will |
| // have to do. |
| usleep(50000); |
| } |
| } |
| return Status::Fail(PStringLog() |
| << "Mounting failed for package " << full_path); |
| } |
| |
| Status mountFlattened(const ApexFile& apex, const std::string& mountPoint, |
| MountedApexData* apex_data) { |
| if (!android::base::StartsWith(apex.GetPath(), kApexPackageSystemDir)) { |
| return Status::Fail(StringLog() |
| << "Cannot activate flattened APEX " << apex.GetPath()); |
| } |
| |
| if (mount(apex.GetPath().c_str(), mountPoint.c_str(), nullptr, MS_BIND, |
| nullptr) == 0) { |
| LOG(INFO) << "Successfully bind-mounted flattened package " |
| << apex.GetPath() << " on " << mountPoint; |
| |
| apex_data->loop_name = ""; // No loop device. |
| |
| return Status::Success(); |
| } |
| return Status::Fail(PStringLog() << "Mounting failed for flattened package " |
| << apex.GetPath()); |
| } |
| |
| Status deactivatePackageImpl(const ApexFile& apex) { |
| // TODO: It's not clear what the right thing to do is for umount failures. |
| |
| const ApexManifest& manifest = apex.GetManifest(); |
| // Unmount "latest" bind-mount. |
| // TODO: What if bind-mount isn't latest? |
| { |
| std::string mount_point = apexd_private::GetActiveMountPoint(manifest); |
| LOG(VERBOSE) << "Unmounting and deleting " << mount_point; |
| if (umount2(mount_point.c_str(), UMOUNT_NOFOLLOW | MNT_DETACH) != 0) { |
| return Status::Fail(PStringLog() << "Failed to unmount " << mount_point); |
| } |
| if (rmdir(mount_point.c_str()) != 0) { |
| PLOG(ERROR) << "Could not rmdir " << mount_point; |
| // Continue here. |
| } |
| } |
| |
| std::string mount_point = apexd_private::GetPackageMountPoint(manifest); |
| LOG(VERBOSE) << "Unmounting and deleting " << mount_point; |
| if (umount2(mount_point.c_str(), UMOUNT_NOFOLLOW | MNT_DETACH) != 0) { |
| return Status::Fail(PStringLog() << "Failed to unmount " << mount_point); |
| } |
| std::string error_msg; |
| if (rmdir(mount_point.c_str()) != 0) { |
| // If we cannot delete the directory, we're in a bad state (e.g., getting |
| // active packages depends on directory existence right now). |
| // TODO: consider additional delayed cleanups, and rewrite once we have |
| // a package database. |
| error_msg = PStringLog() << "Failed to rmdir " << mount_point; |
| } |
| |
| // TODO: Find the loop device connected with the mount. For now, just run the |
| // destroy-all and rely on EBUSY. |
| if (!apex.IsFlattened()) { |
| destroyAllLoopDevices(); |
| } |
| |
| if (error_msg.empty()) { |
| return Status::Success(); |
| } else { |
| return Status::Fail(error_msg); |
| } |
| } |
| |
| } // namespace |
| |
| namespace apexd_private { |
| |
| Status MountPackage(const ApexFile& apex, const std::string& mountPoint) { |
| LOG(VERBOSE) << "Creating mount point: " << mountPoint; |
| if (mkdir(mountPoint.c_str(), kMkdirMode) != 0) { |
| return Status::Fail(PStringLog() |
| << "Could not create mount point " << mountPoint); |
| } |
| |
| MountedApexData data("", apex.GetPath()); |
| Status st = apex.IsFlattened() ? mountFlattened(apex, mountPoint, &data) |
| : mountNonFlattened(apex, mountPoint, &data); |
| if (!st.Ok()) { |
| if (rmdir(mountPoint.c_str()) != 0) { |
| PLOG(WARNING) << "Could not rmdir " << mountPoint; |
| } |
| return st; |
| } |
| |
| gMountedApexes.AddMountedApex(apex.GetManifest().GetName(), false, |
| std::move(data)); |
| return Status::Success(); |
| } |
| |
| Status UnmountPackage(const ApexFile& apex) { |
| LOG(VERBOSE) << "Unmounting " << apex.GetManifest().GetPackageId(); |
| |
| const ApexManifest& manifest = apex.GetManifest(); |
| |
| const MountedApexData* data = nullptr; |
| bool latest = false; |
| |
| gMountedApexes.ForallMountedApexes(manifest.GetName(), |
| [&](const MountedApexData& d, bool l) { |
| if (d.full_path == apex.GetPath()) { |
| data = &d; |
| latest = l; |
| } |
| }); |
| |
| if (data == nullptr) { |
| return Status::Fail(StringLog() << "Did not find " << apex.GetPath()); |
| } |
| |
| if (latest) { |
| return Status::Fail(StringLog() |
| << "Package " << apex.GetPath() << " is active"); |
| } |
| |
| std::string mount_point = apexd_private::GetPackageMountPoint(manifest); |
| // Lazily try to umount whatever is mounted. |
| if (umount2(mount_point.c_str(), UMOUNT_NOFOLLOW | MNT_DETACH) != 0 && |
| errno != EINVAL && errno != ENOENT) { |
| return Status::Fail(PStringLog() |
| << "Failed to unmount directory " << mount_point); |
| } |
| |
| // Clean up gMountedApexes now, even though we're not fully done. |
| std::string loop = data->loop_name; |
| gMountedApexes.RemoveMountedApex(manifest.GetName(), apex.GetPath()); |
| |
| // Attempt to delete the folder. If the folder is retained, other |
| // data may be incorrect. |
| if (rmdir(mount_point.c_str()) != 0) { |
| PLOG(ERROR) << "Failed to rmdir directory " << mount_point; |
| } |
| |
| // Try to free up the loop device. |
| if (!loop.empty()) { |
| auto log_fn = [](const std::string& path, |
| const std::string& id ATTRIBUTE_UNUSED) { |
| LOG(VERBOSE) << "Freeing loop device " << path << "for unmount."; |
| }; |
| DestroyLoopDevice(loop, log_fn); |
| } |
| |
| return Status::Success(); |
| } |
| |
| bool IsMounted(const std::string& name, const std::string& full_path) { |
| bool found_mounted = false; |
| gMountedApexes.ForallMountedApexes( |
| name, [&](const MountedApexData& data, bool latest ATTRIBUTE_UNUSED) { |
| if (full_path == data.full_path) { |
| found_mounted = true; |
| } |
| }); |
| return found_mounted; |
| } |
| |
| std::string GetPackageMountPoint(const ApexManifest& manifest) { |
| return StringPrintf("%s/%s", kApexRoot, manifest.GetPackageId().c_str()); |
| } |
| |
| std::string GetActiveMountPoint(const ApexManifest& manifest) { |
| return StringPrintf("%s/%s", kApexRoot, manifest.GetName().c_str()); |
| } |
| |
| } // namespace apexd_private |
| |
| Status activatePackage(const std::string& full_path) { |
| LOG(INFO) << "Trying to activate " << full_path; |
| |
| StatusOr<ApexFile> apexFile = ApexFile::Open(full_path); |
| if (!apexFile.Ok()) { |
| return apexFile.ErrorStatus(); |
| } |
| const ApexManifest& manifest = apexFile->GetManifest(); |
| |
| // See whether we think it's active, and do not allow to activate the same |
| // version. Also detect whether this is the highest version. |
| // We roll this into a single check. |
| bool is_newest_version = true; |
| bool found_other_version = false; |
| bool version_found_mounted = false; |
| { |
| uint64_t new_version = manifest.GetVersion(); |
| bool version_found_active = false; |
| gMountedApexes.ForallMountedApexes( |
| manifest.GetName(), [&](const MountedApexData& data, bool latest) { |
| StatusOr<ApexFile> otherApex = ApexFile::Open(data.full_path); |
| if (!otherApex.Ok()) { |
| return; |
| } |
| found_other_version = true; |
| if (otherApex->GetManifest().GetVersion() == new_version) { |
| version_found_mounted = true; |
| version_found_active = latest; |
| } |
| if (otherApex->GetManifest().GetVersion() > new_version) { |
| is_newest_version = false; |
| } |
| }); |
| if (version_found_active) { |
| return Status::Fail("Package is already active."); |
| } |
| } |
| |
| std::string mountPoint = apexd_private::GetPackageMountPoint(manifest); |
| |
| if (!version_found_mounted) { |
| Status mountStatus = apexd_private::MountPackage(*apexFile, mountPoint); |
| if (!mountStatus.Ok()) { |
| return mountStatus; |
| } |
| } |
| |
| bool mounted_latest = false; |
| if (is_newest_version) { |
| Status update_st = apexd_private::BindMount( |
| apexd_private::GetActiveMountPoint(manifest), mountPoint); |
| mounted_latest = update_st.Ok(); |
| if (!update_st.Ok()) { |
| // TODO: Fail? |
| LOG(ERROR) << update_st.ErrorMessage(); |
| } |
| } |
| if (mounted_latest) { |
| gMountedApexes.SetLatest(manifest.GetName(), full_path); |
| } |
| |
| return Status::Success(); |
| } |
| |
| Status deactivatePackage(const std::string& full_path) { |
| LOG(INFO) << "Trying to deactivate " << full_path; |
| |
| StatusOr<ApexFile> apexFile = ApexFile::Open(full_path); |
| if (!apexFile.Ok()) { |
| return apexFile.ErrorStatus(); |
| } |
| |
| Status st = deactivatePackageImpl(*apexFile); |
| |
| if (st.Ok()) { |
| gMountedApexes.RemoveMountedApex(apexFile->GetManifest().GetName(), |
| full_path); |
| } |
| |
| return st; |
| } |
| |
| std::vector<ApexFile> getActivePackages() { |
| std::vector<ApexFile> ret; |
| gMountedApexes.ForallMountedApexes( |
| [&](const std::string&, const MountedApexData& data, bool latest) { |
| if (!latest) { |
| return; |
| } |
| |
| StatusOr<ApexFile> apexFile = ApexFile::Open(data.full_path); |
| if (!apexFile.Ok()) { |
| // TODO: Fail? |
| return; |
| } |
| |
| ret.emplace_back(std::move(*apexFile)); |
| }); |
| |
| return ret; |
| } |
| |
| StatusOr<ApexFile> getActivePackage(const std::string& packageName) { |
| std::vector<ApexFile> packages = getActivePackages(); |
| for (ApexFile& apex : packages) { |
| if (apex.GetManifest().GetName() == packageName) { |
| return StatusOr<ApexFile>(std::move(apex)); |
| } |
| } |
| |
| return StatusOr<ApexFile>::MakeError( |
| PStringLog() << "Cannot find matching package for: " << packageName); |
| } |
| |
| void unmountAndDetachExistingImages() { |
| // TODO: this procedure should probably not be needed anymore when apexd |
| // becomes an actual daemon. Remove if that's the case. |
| LOG(INFO) << "Scanning " << kApexRoot |
| << " looking for packages already mounted."; |
| StatusOr<std::vector<std::string>> folders_status = |
| ReadDir(kApexRoot, &DTypeFilter<DT_DIR>); |
| if (!folders_status.Ok()) { |
| LOG(ERROR) << folders_status.ErrorMessage(); |
| return; |
| } |
| |
| // Sort the folders. This way, the "latest" folder will appear before any |
| // versioned folder, so we'll unmount the bind-mount first. |
| std::vector<std::string>& folders = *folders_status; |
| std::sort(folders.begin(), folders.end()); |
| |
| for (const std::string& full_path : folders) { |
| LOG(INFO) << "Unmounting " << full_path; |
| // Lazily try to umount whatever is mounted. |
| if (umount2(full_path.c_str(), UMOUNT_NOFOLLOW | MNT_DETACH) != 0 && |
| errno != EINVAL && errno != ENOENT) { |
| PLOG(ERROR) << "Failed to unmount directory " << full_path; |
| } |
| // Attempt to delete the folder. If the folder is retained, other |
| // data may be incorrect. |
| // TODO: Fix this. |
| if (rmdir(full_path.c_str()) != 0) { |
| PLOG(ERROR) << "Failed to rmdir directory " << full_path; |
| } |
| } |
| |
| destroyAllLoopDevices(); |
| } |
| |
| void scanPackagesDirAndActivate(const char* apex_package_dir) { |
| LOG(INFO) << "Scanning " << apex_package_dir << " looking for APEX packages."; |
| |
| const bool scanSystemApexes = |
| android::base::StartsWith(apex_package_dir, kApexPackageSystemDir); |
| StatusOr<std::vector<std::string>> scan = |
| FindApexFilesByName(apex_package_dir, scanSystemApexes); |
| if (!scan.Ok()) { |
| LOG(WARNING) << scan.ErrorMessage(); |
| return; |
| } |
| |
| for (const std::string& name : *scan) { |
| LOG(INFO) << "Found " << name; |
| |
| Status res = activatePackage(name); |
| if (!res.Ok()) { |
| LOG(ERROR) << res.ErrorMessage(); |
| } |
| } |
| } |
| |
| StatusOr<std::vector<ApexFile>> verifySessionDir(const int session_id) { |
| std::string sessionDirPath = std::string(kStagedSessionsDir) + "/session_" + |
| std::to_string(session_id); |
| LOG(INFO) << "Scanning " << sessionDirPath |
| << " looking for packages to be validated"; |
| StatusOr<std::vector<std::string>> scan = |
| FindApexFilesByName(sessionDirPath, /* include_dirs=*/false); |
| if (!scan.Ok()) { |
| LOG(WARNING) << scan.ErrorMessage(); |
| return StatusOr<std::vector<ApexFile>>::MakeError(scan.ErrorMessage()); |
| } |
| |
| // TODO(b/118865310): support sessions of sessions i.e. multi-package |
| // sessions. |
| if (scan->size() > 1) { |
| return StatusOr<std::vector<ApexFile>>::MakeError( |
| "More than one APEX package found in the same session directory."); |
| } |
| |
| return verifyPackages(*scan); |
| } |
| |
| void scanStagedSessionsDirAndStage() { |
| LOG(INFO) << "Scanning " << kStagedSessionsDir |
| << " looking for sessions to be activated."; |
| |
| StatusOr<std::vector<std::string>> sessions = |
| ReadDir(kStagedSessionsDir, [](unsigned char d_type, const char* d_name) { |
| return (d_type == DT_DIR) && StartsWith(d_name, "session_"); |
| }); |
| if (!sessions.Ok()) { |
| LOG(WARNING) << sessions.ErrorMessage(); |
| return; |
| } |
| |
| for (const std::string sessionDirPath : *sessions) { |
| // TODO(b/118865310): support sessions of sessions i.e. multi-package |
| // sessions. |
| StatusOr<std::vector<std::string>> apexes = |
| FindApexFilesByName(sessionDirPath, /* include_dirs=*/false); |
| if (!apexes.Ok()) { |
| LOG(WARNING) << apexes.ErrorMessage(); |
| continue; |
| } |
| |
| // TODO(b/118865310): double check that there is only one apex file per |
| // dir? |
| |
| for (const std::string& apexFilePath : *apexes) { |
| const Status result = |
| stagePackages({apexFilePath}, /* linkPackages */ true); |
| if (!result.Ok()) { |
| LOG(ERROR) << "Activation failed for package " << apexFilePath << ": " |
| << result.ErrorMessage(); |
| // TODO(b/118865310): mark session as failed, rollback the changes |
| // and reboot the device |
| } |
| } |
| } |
| // TODO(b/118865310): mark session as successful |
| } |
| |
| StatusOr<std::vector<ApexFile>> verifyPackages( |
| const std::vector<std::string>& paths) { |
| LOG(DEBUG) << "verifyPackages() for " << android::base::Join(paths, ','); |
| |
| if (paths.empty()) { |
| return StatusOr<std::vector<ApexFile>>::MakeError("Empty set of inputs"); |
| } |
| std::vector<ApexFile> ret; |
| // Note: assume that sessions do not have thousands of paths, so that it is |
| // OK to keep the ApexFile/ApexManifests in memory. |
| |
| // Open all to check they can be opened and have valid manifests etc. |
| for (const std::string& path : paths) { |
| StatusOr<ApexFile> apex_file = ApexFile::Open(path); |
| if (!apex_file.Ok()) { |
| return StatusOr<std::vector<ApexFile>>::MakeError( |
| apex_file.ErrorMessage()); |
| } |
| StatusOr<ApexVerityData> verity_or = apex_file->VerifyApexVerity( |
| {kApexKeySystemDirectory, kApexKeyProductDirectory}); |
| if (!verity_or.Ok()) { |
| return StatusOr<std::vector<ApexFile>>::MakeError( |
| verity_or.ErrorMessage()); |
| } |
| ret.push_back(std::move(*apex_file)); |
| } |
| |
| return StatusOr<std::vector<ApexFile>>(std::move(ret)); |
| } |
| |
| Status preinstallPackages(const std::vector<std::string>& paths) { |
| LOG(DEBUG) << "preinstallPackages() for " << android::base::Join(paths, ','); |
| |
| if (paths.empty()) { |
| return Status::Fail("Empty set of inputs"); |
| } |
| |
| // Note: assume that sessions do not have thousands of paths, so that it is |
| // OK to keep the ApexFile/ApexManifests in memory. |
| |
| // 1) Open all APEXes, check whether they have hooks. |
| bool has_preInstallHooks = false; |
| std::vector<ApexFile> apex_files; |
| for (const std::string& path : paths) { |
| StatusOr<ApexFile> apex_file = ApexFile::Open(path); |
| if (!apex_file.Ok()) { |
| return apex_file.ErrorStatus(); |
| } |
| if (!apex_file->GetManifest().GetPreInstallHook().empty()) { |
| has_preInstallHooks = true; |
| } |
| apex_files.emplace_back(std::move(*apex_file)); |
| } |
| |
| // 2) If we found hooks, run pre-install. |
| if (has_preInstallHooks) { |
| Status preinstall_status = StagePreInstall(apex_files); |
| if (!preinstall_status.Ok()) { |
| return preinstall_status; |
| } |
| } |
| |
| return Status::Success(); |
| } |
| |
| Status stagePackages(const std::vector<std::string>& tmpPaths, |
| bool linkPackages) { |
| LOG(DEBUG) << "stagePackages() for " << android::base::Join(tmpPaths, ','); |
| |
| // Note: this function is temporary. As such the code is not optimized, e.g., |
| // it will open ApexFiles multiple times. |
| |
| // 1) Verify all packages. |
| auto verify_status = verifyPackages(tmpPaths); |
| if (!verify_status.Ok()) { |
| return Status::Fail(verify_status.ErrorMessage()); |
| } |
| if (tmpPaths.empty()) { |
| return Status::Fail("Empty set of inputs"); |
| } |
| |
| // 2) Now stage all of them. |
| |
| auto path_fn = [](const ApexFile& apex_file) { |
| return StringPrintf("%s/%s%s", kApexPackageDataDir, |
| apex_file.GetManifest().GetPackageId().c_str(), |
| kApexPackageSuffix); |
| }; |
| |
| // Ensure the APEX gets removed on failure. |
| std::vector<std::string> staged; |
| auto deleter = [&staged]() { |
| for (const std::string& staged_path : staged) { |
| if (TEMP_FAILURE_RETRY(unlink(staged_path.c_str())) != 0) { |
| PLOG(ERROR) << "Unable to unlink " << staged_path; |
| } |
| } |
| }; |
| auto scope_guard = android::base::make_scope_guard(deleter); |
| |
| for (const std::string& path : tmpPaths) { |
| StatusOr<ApexFile> apex_file = ApexFile::Open(path); |
| if (!apex_file.Ok()) { |
| return apex_file.ErrorStatus(); |
| } |
| std::string dest_path = path_fn(*apex_file); |
| |
| if (linkPackages) { |
| if (link(apex_file->GetPath().c_str(), dest_path.c_str()) != 0) { |
| // TODO: Get correct binder error status. |
| return Status::Fail(PStringLog() |
| << "Unable to link " << apex_file->GetPath() |
| << " to " << dest_path); |
| } |
| } else { |
| if (rename(apex_file->GetPath().c_str(), dest_path.c_str()) != 0) { |
| // TODO: Get correct binder error status. |
| return Status::Fail(PStringLog() |
| << "Unable to rename " << apex_file->GetPath() |
| << " to " << dest_path); |
| } |
| } |
| staged.push_back(dest_path); |
| |
| if (!linkPackages) { |
| // TODO(b/112669193,b/118865310) remove this. Link files from staging |
| // directory should be the only method allowed. |
| if (selinux_android_restorecon(dest_path.c_str(), 0) < 0) { |
| return Status::Fail(PStringLog() |
| << "Failed to restorecon " << dest_path); |
| } |
| } |
| LOG(DEBUG) << "Success linking " << apex_file->GetPath() << " to " |
| << dest_path; |
| } |
| |
| // 3) Run preinstall, if necessary. |
| Status preinstall_status = preinstallPackages(staged); |
| if (!preinstall_status.Ok()) { |
| return preinstall_status; |
| } |
| |
| scope_guard.Disable(); // Accept the state. |
| return Status::Success(); |
| } |
| |
| void onStart() { |
| if (!android::base::SetProperty(kApexStatusSysprop, kApexStatusStarting)) { |
| PLOG(ERROR) << "Failed to set " << kApexStatusSysprop << " to " |
| << kApexStatusStarting; |
| } |
| } |
| |
| void onAllPackagesReady() { |
| // Set a system property to let other components to know that APEXs are |
| // correctly mounted and ready to be used. Before using any file from APEXs, |
| // they can query this system property to ensure that they are okay to |
| // access. Or they may have a on-property trigger to delay a task until |
| // APEXs become ready. |
| if (!android::base::SetProperty(kApexStatusSysprop, kApexStatusReady)) { |
| PLOG(ERROR) << "Failed to set " << kApexStatusSysprop << " to " |
| << kApexStatusReady; |
| } |
| } |
| |
| StatusOr<std::vector<ApexFile>> submitStagedSession(const int session_id) { |
| auto verified = verifySessionDir(session_id); |
| if (verified.Ok()) { |
| SessionState sessionState; |
| sessionState.set_state(SessionState::STAGED); |
| sessionState.set_retry_count(0); |
| auto stateWritten = writeSessionState(session_id, sessionState); |
| if (!stateWritten.Ok()) { |
| return StatusOr<std::vector<ApexFile>>::MakeError( |
| stateWritten.ErrorMessage()); |
| } |
| } |
| return verified; |
| } |
| |
| } // namespace apex |
| } // namespace android |