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android / platform / system / apex / refs/heads/android13-tests-dev / . / apexd / apexd.cpp
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/*
* 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 ATRACE_TAG ATRACE_TAG_PACKAGE_MANAGER
#include "apexd.h"
#include <ApexProperties.sysprop.h>
#include <android-base/chrono_utils.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/macros.h>
#include <android-base/parseint.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 <dirent.h>
#include <fcntl.h>
#include <google/protobuf/util/message_differencer.h>
#include <libavb/libavb.h>
#include <libdm/dm.h>
#include <libdm/dm_table.h>
#include <libdm/dm_target.h>
#include <linux/f2fs.h>
#include <linux/loop.h>
#include <selinux/android.h>
#include <stdlib.h>
#include <sys/inotify.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/sysinfo.h>
#include <sys/types.h>
#include <unistd.h>
#include <utils/Trace.h>
#include <algorithm>
#include <array>
#include <chrono>
#include <cstdlib>
#include <filesystem>
#include <fstream>
#include <future>
#include <iomanip>
#include <iterator>
#include <memory>
#include <mutex>
#include <optional>
#include <queue>
#include <sstream>
#include <string>
#include <string_view>
#include <thread>
#include <unordered_map>
#include <unordered_set>
#include "VerityUtils.h"
#include "apex_constants.h"
#include "apex_database.h"
#include "apex_file.h"
#include "apex_file_repository.h"
#include "apex_manifest.h"
#include "apex_shim.h"
#include "apexd_checkpoint.h"
#include "apexd_lifecycle.h"
#include "apexd_loop.h"
#include "apexd_private.h"
#include "apexd_rollback_utils.h"
#include "apexd_session.h"
#include "apexd_utils.h"
#include "apexd_verity.h"
#include "com_android_apex.h"
using android::base::boot_clock;
using android::base::ConsumePrefix;
using android::base::ErrnoError;
using android::base::Error;
using android::base::GetProperty;
using android::base::Join;
using android::base::ParseUint;
using android::base::RemoveFileIfExists;
using android::base::Result;
using android::base::SetProperty;
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::ApexManifest;
using apex::proto::SessionState;
using google::protobuf::util::MessageDifferencer;
namespace android {
namespace apex {
using MountedApexData = MountedApexDatabase::MountedApexData;
namespace {
static constexpr const char* kBuildFingerprintSysprop = "ro.build.fingerprint";
// This should be in UAPI, but it's not :-(
static constexpr const char* kDmVerityRestartOnCorruption =
"restart_on_corruption";
MountedApexDatabase gMountedApexes;
std::optional<ApexdConfig> gConfig;
CheckpointInterface* gVoldService;
bool gSupportsFsCheckpoints = false;
bool gInFsCheckpointMode = false;
// APEXEs for which a different version was activated than in the previous boot.
// This can happen in the following scenarios:
// 1. This APEX is part of the staged session that was applied during this
// boot.
// 2. This is a compressed APEX that was decompressed during this boot.
// 3. We failed to activate APEX from /data/apex/active and fallback to the
// pre-installed APEX.
std::set<std::string> gChangedActiveApexes;
static constexpr size_t kLoopDeviceSetupAttempts = 3u;
// Please DO NOT add new modules to this list without contacting mainline-modularization@ first.
static const std::vector<std::string> kBootstrapApexes = ([]() {
std::vector<std::string> ret = {
"com.android.i18n",
"com.android.runtime",
"com.android.tzdata",
};
auto vendor_vndk_ver = GetProperty("ro.vndk.version", "");
if (vendor_vndk_ver != "") {
ret.push_back("com.android.vndk.v" + vendor_vndk_ver);
}
auto product_vndk_ver = GetProperty("ro.product.vndk.version", "");
if (product_vndk_ver != "" && product_vndk_ver != vendor_vndk_ver) {
ret.push_back("com.android.vndk.v" + product_vndk_ver);
}
return ret;
})();
static constexpr const int kNumRetriesWhenCheckpointingEnabled = 1;
bool IsBootstrapApex(const ApexFile& apex) {
return std::find(kBootstrapApexes.begin(), kBootstrapApexes.end(),
apex.GetManifest().name()) != kBootstrapApexes.end();
}
void ReleaseF2fsCompressedBlocks(const std::string& file_path) {
unique_fd fd(
TEMP_FAILURE_RETRY(open(file_path.c_str(), O_RDONLY | O_CLOEXEC, 0)));
if (fd.get() == -1) {
PLOG(ERROR) << "Failed to open " << file_path;
return;
}
unsigned int flags;
if (ioctl(fd, FS_IOC_GETFLAGS, &flags) == -1) {
PLOG(ERROR) << "Failed to call FS_IOC_GETFLAGS on " << file_path;
return;
}
if ((flags & FS_COMPR_FL) == 0) {
// Doesn't support f2fs-compression.
return;
}
uint64_t blk_cnt;
if (ioctl(fd, F2FS_IOC_RELEASE_COMPRESS_BLOCKS, &blk_cnt) == -1) {
PLOG(ERROR) << "Failed to call F2FS_IOC_RELEASE_COMPRESS_BLOCKS on "
<< file_path;
}
LOG(INFO) << "Released " << blk_cnt << " compressed blocks from "
<< file_path;
}
// Pre-allocate loop devices so that we don't have to wait for them
// later when actually activating APEXes.
Result<void> PreAllocateLoopDevices() {
auto scan = FindApexes(kApexPackageBuiltinDirs);
if (!scan.ok()) {
return scan.error();
}
auto size = 0;
for (const auto& path : *scan) {
auto apex_file = ApexFile::Open(path);
if (!apex_file.ok()) {
continue;
}
size++;
// bootstrap Apexes may be activated on separate namespaces.
if (IsBootstrapApex(*apex_file)) {
size++;
}
}
// note: do not call PreAllocateLoopDevices() if size == 0.
// For devices (e.g. ARC) which doesn't support loop-control
// PreAllocateLoopDevices() can cause problem when it tries
// to access /dev/loop-control.
if (size == 0) {
return {};
}
return loop::PreAllocateLoopDevices(size);
}
std::unique_ptr<DmTable> CreateVerityTable(const ApexVerityData& verity_data,
const std::string& block_device,
const std::string& hash_device,
bool restart_on_corruption) {
AvbHashtreeDescriptor* desc = verity_data.desc.get();
auto table = std::make_unique<DmTable>();
uint32_t hash_start_block = 0;
if (hash_device == block_device) {
hash_start_block = desc->tree_offset / desc->hash_block_size;
}
auto target = std::make_unique<DmTargetVerity>(
0, desc->image_size / 512, desc->dm_verity_version, block_device,
hash_device, desc->data_block_size, desc->hash_block_size,
desc->image_size / desc->data_block_size, hash_start_block,
verity_data.hash_algorithm, verity_data.root_digest, verity_data.salt);
target->IgnoreZeroBlocks();
if (restart_on_corruption) {
target->SetVerityMode(kDmVerityRestartOnCorruption);
}
table->AddTarget(std::move(target));
table->set_readonly(true);
return table;
}
// Deletes a dm-verity device with a given name and path
// Synchronizes on the device actually being deleted from userspace.
Result<void> DeleteVerityDevice(const std::string& name, bool deferred) {
DeviceMapper& dm = DeviceMapper::Instance();
if (deferred) {
if (!dm.DeleteDeviceDeferred(name)) {
return ErrnoError() << "Failed to issue deferred delete of verity device "
<< name;
}
return {};
}
auto timeout = std::chrono::milliseconds(
android::sysprop::ApexProperties::dm_delete_timeout().value_or(750));
if (!dm.DeleteDevice(name, timeout)) {
return Error() << "Failed to delete dm-device " << name;
}
return {};
}
class DmVerityDevice {
public:
DmVerityDevice() : cleared_(true) {}
explicit DmVerityDevice(std::string name)
: name_(std::move(name)), cleared_(false) {}
DmVerityDevice(std::string name, std::string dev_path)
: name_(std::move(name)),
dev_path_(std::move(dev_path)),
cleared_(false) {}
DmVerityDevice(DmVerityDevice&& other) noexcept
: name_(std::move(other.name_)),
dev_path_(std::move(other.dev_path_)),
cleared_(other.cleared_) {
other.cleared_ = true;
}
DmVerityDevice& operator=(DmVerityDevice&& other) noexcept {
name_ = other.name_;
dev_path_ = other.dev_path_;
cleared_ = other.cleared_;
other.cleared_ = true;
return *this;
}
~DmVerityDevice() {
if (!cleared_) {
Result<void> ret = DeleteVerityDevice(name_, /* deferred= */ false);
if (!ret.ok()) {
LOG(ERROR) << ret.error();
}
}
}
const std::string& GetName() const { return name_; }
const std::string& GetDevPath() const { return dev_path_; }
void Release() { cleared_ = true; }
private:
std::string name_;
std::string dev_path_;
bool cleared_;
};
Result<DmVerityDevice> CreateVerityDevice(
DeviceMapper& dm, const std::string& name, const DmTable& table,
const std::chrono::milliseconds& timeout) {
std::string dev_path;
if (!dm.CreateDevice(name, table, &dev_path, timeout)) {
return Errorf("Couldn't create verity device.");
}
return DmVerityDevice(name, dev_path);
}
Result<DmVerityDevice> CreateVerityDevice(const std::string& name,
const DmTable& table,
bool reuse_device) {
ATRACE_NAME("CreateVerityDevice");
LOG(VERBOSE) << "Creating verity device " << name;
auto timeout = std::chrono::milliseconds(
android::sysprop::ApexProperties::dm_create_timeout().value_or(1000));
DeviceMapper& dm = DeviceMapper::Instance();
auto state = dm.GetState(name);
if (state == DmDeviceState::INVALID) {
return CreateVerityDevice(dm, name, table, timeout);
}
if (reuse_device) {
if (state == DmDeviceState::ACTIVE) {
LOG(WARNING) << "Deleting existing active dm device " << name;
if (auto r = DeleteVerityDevice(name, /* deferred= */ false); !r.ok()) {
return r.error();
}
return CreateVerityDevice(dm, name, table, timeout);
}
if (!dm.LoadTableAndActivate(name, table)) {
dm.DeleteDevice(name);
return Error() << "Failed to activate dm device " << name;
}
std::string path;
if (!dm.WaitForDevice(name, timeout, &path)) {
dm.DeleteDevice(name);
return Error() << "Failed waiting for dm device " << name;
}
return DmVerityDevice(name, path);
} else {
if (state != DmDeviceState::INVALID) {
// Delete dangling dm-device. This can happen if apexd fails to delete it
// while unmounting an apex.
LOG(WARNING) << "Deleting existing dm device " << name;
if (auto r = DeleteVerityDevice(name, /* deferred= */ false); !r.ok()) {
return r.error();
}
}
return CreateVerityDevice(dm, name, table, timeout);
}
}
/**
* When we create hardlink for a new apex package in kActiveApexPackagesDataDir,
* there might be an older version of the same package already present in there.
* Since a new version of the same package is being installed on this boot, the
* old one needs to deleted so that we don't end up activating same package
* twice.
*
* @param affected_packages package names of the news apex that are being
* installed in this boot
* @param files_to_keep path to the new apex packages in
* kActiveApexPackagesDataDir
*/
Result<void> RemovePreviouslyActiveApexFiles(
const std::unordered_set<std::string>& affected_packages,
const std::unordered_set<std::string>& files_to_keep) {
auto all_active_apex_files =
FindFilesBySuffix(gConfig->active_apex_data_dir, {kApexPackageSuffix});
if (!all_active_apex_files.ok()) {
return all_active_apex_files.error();
}
for (const std::string& path : *all_active_apex_files) {
Result<ApexFile> apex_file = ApexFile::Open(path);
if (!apex_file.ok()) {
return apex_file.error();
}
const std::string& package_name = apex_file->GetManifest().name();
if (affected_packages.find(package_name) == affected_packages.end()) {
// This apex belongs to a package that wasn't part of this stage sessions,
// hence it should be kept.
continue;
}
if (files_to_keep.find(apex_file->GetPath()) != files_to_keep.end()) {
// This is a path that was staged and should be kept.
continue;
}
LOG(DEBUG) << "Deleting previously active apex " << apex_file->GetPath();
if (unlink(apex_file->GetPath().c_str()) != 0) {
return ErrnoError() << "Failed to unlink " << apex_file->GetPath();
}
}
return {};
}
// Reads the entire device to verify the image is authenticatic
Result<void> ReadVerityDevice(const std::string& verity_device,
uint64_t device_size) {
static constexpr int kBlockSize = 4096;
static constexpr size_t kBufSize = 1024 * kBlockSize;
std::vector<uint8_t> buffer(kBufSize);
unique_fd fd(
TEMP_FAILURE_RETRY(open(verity_device.c_str(), O_RDONLY | O_CLOEXEC)));
if (fd.get() == -1) {
return ErrnoError() << "Can't open " << verity_device;
}
size_t bytes_left = device_size;
while (bytes_left > 0) {
size_t to_read = std::min(bytes_left, kBufSize);
if (!android::base::ReadFully(fd.get(), buffer.data(), to_read)) {
return ErrnoError() << "Can't verify " << verity_device << "; corrupted?";
}
bytes_left -= to_read;
}
return {};
}
Result<void> VerifyMountedImage(const ApexFile& apex,
const std::string& mount_point) {
// Verify that apex_manifest.pb inside mounted image matches the one in the
// outer .apex container.
Result<ApexManifest> verified_manifest =
ReadManifest(mount_point + "/" + kManifestFilenamePb);
if (!verified_manifest.ok()) {
return verified_manifest.error();
}
if (!MessageDifferencer::Equals(*verified_manifest, apex.GetManifest())) {
return Errorf(
"Manifest inside filesystem does not match manifest outside it");
}
if (shim::IsShimApex(apex)) {
return shim::ValidateShimApex(mount_point, apex);
}
return {};
}
Result<MountedApexData> MountPackageImpl(const ApexFile& apex,
const std::string& mount_point,
const std::string& device_name,
const std::string& hashtree_file,
bool verify_image, bool reuse_device,
bool temp_mount = false) {
auto tag = "MountPackageImpl: " + apex.GetManifest().name();
ATRACE_NAME(tag.c_str());
if (apex.IsCompressed()) {
return Error() << "Cannot directly mount compressed APEX "
<< apex.GetPath();
}
LOG(VERBOSE) << "Creating mount point: " << mount_point;
auto time_started = boot_clock::now();
// Note: the mount point could exist in case when the APEX was activated
// during the bootstrap phase (e.g., the runtime or tzdata APEX).
// Although we have separate mount namespaces to separate the early activated
// APEXes from the normally activate APEXes, the mount points themselves
// are shared across the two mount namespaces because /apex (a tmpfs) itself
// mounted at / which is (and has to be) a shared mount. Therefore, if apexd
// finds an empty directory under /apex, it's not a problem and apexd can use
// it.
auto exists = PathExists(mount_point);
if (!exists.ok()) {
return exists.error();
}
if (!*exists && mkdir(mount_point.c_str(), kMkdirMode) != 0) {
return ErrnoError() << "Could not create mount point " << mount_point;
}
auto deleter = [&mount_point]() {
if (rmdir(mount_point.c_str()) != 0) {
PLOG(WARNING) << "Could not rmdir " << mount_point;
}
};
auto scope_guard = android::base::make_scope_guard(deleter);
if (!IsEmptyDirectory(mount_point)) {
return ErrnoError() << mount_point << " is not empty";
}
const std::string& full_path = apex.GetPath();
if (!apex.GetImageOffset() || !apex.GetImageSize()) {
return Error() << "Cannot create mount point without image offset and size";
}
loop::LoopbackDeviceUniqueFd loopback_device;
for (size_t attempts = 1;; ++attempts) {
Result<loop::LoopbackDeviceUniqueFd> ret =
loop::CreateAndConfigureLoopDevice(full_path,
apex.GetImageOffset().value(),
apex.GetImageSize().value());
if (ret.ok()) {
loopback_device = std::move(*ret);
break;
}
if (attempts >= kLoopDeviceSetupAttempts) {
return Error() << "Could not create loop device for " << full_path << ": "
<< ret.error();
}
}
LOG(VERBOSE) << "Loopback device created: " << loopback_device.name;
auto& instance = ApexFileRepository::GetInstance();
auto public_key = instance.GetPublicKey(apex.GetManifest().name());
if (!public_key.ok()) {
return public_key.error();
}
auto verity_data = apex.VerifyApexVerity(*public_key);
if (!verity_data.ok()) {
return Error() << "Failed to verify Apex Verity data for " << full_path
<< ": " << verity_data.error();
}
if (instance.IsBlockApex(apex)) {
auto root_digest =
instance.GetBlockApexRootDigest(apex.GetManifest().name());
if (root_digest.has_value() &&
root_digest.value() != verity_data->root_digest) {
return Error() << "Failed to verify Apex Verity data for " << full_path
<< ": root digest (" << verity_data->root_digest
<< ") mismatches with the one (" << root_digest.value()
<< ") specified in config";
}
}
std::string block_device = loopback_device.name;
MountedApexData apex_data(loopback_device.name, apex.GetPath(), mount_point,
/* device_name = */ "",
/* hashtree_loop_name = */ "",
/* is_temp_mount */ temp_mount);
// for APEXes in immutable partitions, 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 mount_on_verity = !instance.IsPreInstalledApex(apex) ||
// decompressed apexes are on /data
instance.IsDecompressedApex(apex) ||
// block apexes are from host
instance.IsBlockApex(apex);
DmVerityDevice verity_dev;
loop::LoopbackDeviceUniqueFd loop_for_hash;
if (mount_on_verity) {
std::string hash_device = loopback_device.name;
if (verity_data->desc->tree_size == 0) {
if (auto st = PrepareHashTree(apex, *verity_data, hashtree_file);
!st.ok()) {
return st.error();
}
auto create_loop_status =
loop::CreateAndConfigureLoopDevice(hashtree_file,
/* image_offset= */ 0,
/* image_size= */ 0);
if (!create_loop_status.ok()) {
return create_loop_status.error();
}
loop_for_hash = std::move(*create_loop_status);
hash_device = loop_for_hash.name;
apex_data.hashtree_loop_name = hash_device;
}
auto verity_table =
CreateVerityTable(*verity_data, loopback_device.name, hash_device,
/* restart_on_corruption = */ !verify_image);
Result<DmVerityDevice> verity_dev_res =
CreateVerityDevice(device_name, *verity_table, reuse_device);
if (!verity_dev_res.ok()) {
return Error() << "Failed to create Apex Verity device " << full_path
<< ": " << verity_dev_res.error();
}
verity_dev = std::move(*verity_dev_res);
apex_data.device_name = device_name;
block_device = verity_dev.GetDevPath();
Result<void> read_ahead_status =
loop::ConfigureReadAhead(verity_dev.GetDevPath());
if (!read_ahead_status.ok()) {
return read_ahead_status.error();
}
}
// TODO(b/158467418): consider moving this inside RunVerifyFnInsideTempMount.
if (mount_on_verity && verify_image) {
Result<void> verity_status =
ReadVerityDevice(block_device, (*verity_data).desc->image_size);
if (!verity_status.ok()) {
return verity_status.error();
}
}
uint32_t mount_flags = MS_NOATIME | MS_NODEV | MS_DIRSYNC | MS_RDONLY;
if (apex.GetManifest().nocode()) {
mount_flags |= MS_NOEXEC;
}
if (!apex.GetFsType()) {
return Error() << "Cannot mount package without FsType";
}
if (mount(block_device.c_str(), mount_point.c_str(),
apex.GetFsType().value().c_str(), mount_flags, nullptr) == 0) {
auto time_elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
boot_clock::now() - time_started).count();
LOG(INFO) << "Successfully mounted package " << full_path << " on "
<< mount_point << " duration=" << time_elapsed;
auto status = VerifyMountedImage(apex, mount_point);
if (!status.ok()) {
if (umount2(mount_point.c_str(), UMOUNT_NOFOLLOW) != 0) {
PLOG(ERROR) << "Failed to umount " << mount_point;
}
return Error() << "Failed to verify " << full_path << ": "
<< status.error();
}
// Time to accept the temporaries as good.
verity_dev.Release();
loopback_device.CloseGood();
loop_for_hash.CloseGood();
scope_guard.Disable(); // Accept the mount.
return apex_data;
} else {
return ErrnoError() << "Mounting failed for package " << full_path;
}
}
std::string GetHashTreeFileName(const ApexFile& apex, bool is_new) {
const std::string& id = GetPackageId(apex.GetManifest());
std::string ret =
StringPrintf("%s/%s", gConfig->apex_hash_tree_dir, id.c_str());
return is_new ? ret + ".new" : ret;
}
Result<MountedApexData> VerifyAndTempMountPackage(
const ApexFile& apex, const std::string& mount_point) {
const std::string& package_id = GetPackageId(apex.GetManifest());
LOG(DEBUG) << "Temp mounting " << package_id << " to " << mount_point;
const std::string& temp_device_name = package_id + ".tmp";
std::string hashtree_file = GetHashTreeFileName(apex, /* is_new = */ true);
if (access(hashtree_file.c_str(), F_OK) == 0) {
LOG(DEBUG) << hashtree_file << " already exists. Deleting it";
if (TEMP_FAILURE_RETRY(unlink(hashtree_file.c_str())) != 0) {
return ErrnoError() << "Failed to unlink " << hashtree_file;
}
}
auto ret =
MountPackageImpl(apex, mount_point, temp_device_name, hashtree_file,
/* verify_image = */ true, /* reuse_device= */ false,
/* temp_mount = */ true);
if (!ret.ok()) {
LOG(DEBUG) << "Cleaning up " << hashtree_file;
if (TEMP_FAILURE_RETRY(unlink(hashtree_file.c_str())) != 0) {
PLOG(ERROR) << "Failed to unlink " << hashtree_file;
}
} else {
gMountedApexes.AddMountedApex(apex.GetManifest().name(), false, *ret);
}
return ret;
}
} // namespace
Result<void> Unmount(const MountedApexData& data, bool deferred) {
LOG(DEBUG) << "Unmounting " << data.full_path << " from mount point "
<< data.mount_point << " deferred = " << deferred;
// Lazily try to umount whatever is mounted.
if (umount2(data.mount_point.c_str(), UMOUNT_NOFOLLOW) != 0 &&
errno != EINVAL && errno != ENOENT) {
return ErrnoError() << "Failed to unmount directory " << data.mount_point;
}
if (!deferred) {
if (rmdir(data.mount_point.c_str()) != 0) {
PLOG(ERROR) << "Failed to rmdir " << data.mount_point;
}
}
// Try to free up the device-mapper device.
if (!data.device_name.empty()) {
const auto& result = DeleteVerityDevice(data.device_name, deferred);
if (!result.ok()) {
return result;
}
}
// Try to free up the loop device.
auto log_fn = [](const std::string& path, const std::string& /*id*/) {
LOG(VERBOSE) << "Freeing loop device " << path << " for unmount.";
};
// Since we now use LO_FLAGS_AUTOCLEAR when configuring loop devices, in
// theory we don't need to manually call DestroyLoopDevice here even if
// |deferred| is false. However we prefer to call it to ensure the invariant
// of SubmitStagedSession (after it's done, loop devices created for temp
// mount are freed).
if (!data.loop_name.empty() && !deferred) {
loop::DestroyLoopDevice(data.loop_name, log_fn);
}
if (!data.hashtree_loop_name.empty() && !deferred) {
loop::DestroyLoopDevice(data.hashtree_loop_name, log_fn);
}
return {};
}
namespace {
// TODO(b/218672709): get the ro.build.version.sdk version of the device.
const auto kSepolicyLevel = std::to_string(__ANDROID_API_T__);
const auto kVersionedSepolicyZip = "SEPolicy-" + kSepolicyLevel + ".zip";
const auto kVersionedSepolicySig = "SEPolicy-" + kSepolicyLevel + ".zip.sig";
const auto kVersionedSepolicyFsv =
"SEPolicy-" + kSepolicyLevel + ".zip.fsv_sig";
const auto kSepolicyZip = "SEPolicy.zip";
const auto kSepolicySig = "SEPolicy.zip.sig";
const auto kSepolicyFsv = "SEPolicy.zip.fsv_sig";
Result<void> CopySepolicyToMetadata(const std::string& mount_point) {
LOG(DEBUG) << "Copying SEPolicy files to /metadata/sepolicy/staged.";
const auto policy_dir = mount_point + "/etc";
// Find SEPolicy zip and signature files.
std::optional<std::string> sepolicy_zip;
std::optional<std::string> sepolicy_sig;
std::optional<std::string> sepolicy_fsv;
auto status =
WalkDir(policy_dir, [&sepolicy_zip, &sepolicy_sig, &sepolicy_fsv](
const std::filesystem::directory_entry& entry) {
if (!entry.is_regular_file()) {
return;
}
const auto& path = entry.path().string();
if (base::EndsWith(path, kVersionedSepolicyZip)) {
sepolicy_zip = path;
} else if (base::EndsWith(path, kVersionedSepolicySig)) {
sepolicy_sig = path;
} else if (base::EndsWith(path, kVersionedSepolicyFsv)) {
sepolicy_fsv = path;
}
});
if (!status.ok()) {
return status.error();
}
if (sepolicy_zip->empty() || sepolicy_sig->empty() || sepolicy_fsv->empty()) {
return Error() << "SEPolicy files not found.";
}
LOG(INFO) << "SEPolicy files found.";
// Set up staging directory.
std::error_code ec;
const auto staged_dir =
std::string(gConfig->metadata_sepolicy_staged_dir) + "/";
status = CreateDirIfNeeded(staged_dir, 0755);
if (!status.ok()) {
return status.error();
}
// Clean up after myself.
auto scope_guard = android::base::make_scope_guard([&staged_dir]() {
std::error_code ec;
std::filesystem::remove_all(staged_dir, ec);
if (ec) {
LOG(WARNING) << "Failed to clear " << staged_dir << ": " << ec.message();
}
});
// Copy files to staged folder.
const auto stagedSepolicyZip = staged_dir + kSepolicyZip;
const auto stagedSepolicyFsv = staged_dir + kSepolicyFsv;
std::map<std::string, std::string> from_to = {
{*sepolicy_zip, stagedSepolicyZip},
{*sepolicy_sig, staged_dir + kSepolicySig},
{*sepolicy_fsv, stagedSepolicyFsv}};
for (const auto& [from, to] : from_to) {
std::filesystem::copy_file(
from, to, std::filesystem::copy_options::update_existing, ec);
if (ec) {
return Error() << "Failed to copy " << from << " to " << to << ": "
<< ec.message();
}
}
status = enableFsVerity(stagedSepolicyZip, stagedSepolicyFsv);
if (!status.ok()) {
// TODO(b/218672709): once we have a release certificate available, return
// an error and make the ApexdMountTest#CopySepolicyToMetadata test pass.
LOG(ERROR) << status.error().message();
} else {
LOG(INFO) << "fs-verity enabled on " << stagedSepolicyZip;
}
scope_guard.Disable();
return {};
}
template <typename VerifyFn>
Result<void> RunVerifyFnInsideTempMount(const ApexFile& apex,
const VerifyFn& verify_fn,
bool unmount_during_cleanup) {
// Temp mount image of this apex to validate it was properly signed;
// this will also read the entire block device through dm-verity, so
// we can be sure there is no corruption.
const std::string& temp_mount_point =
apexd_private::GetPackageTempMountPoint(apex.GetManifest());
Result<MountedApexData> mount_status =
VerifyAndTempMountPackage(apex, temp_mount_point);
if (!mount_status.ok()) {
LOG(ERROR) << "Failed to temp mount to " << temp_mount_point << " : "
<< mount_status.error();
return mount_status.error();
}
auto cleaner = [&]() {
LOG(DEBUG) << "Unmounting " << temp_mount_point;
Result<void> result = Unmount(*mount_status, /* deferred= */ false);
if (!result.ok()) {
LOG(WARNING) << "Failed to unmount " << temp_mount_point << " : "
<< result.error();
}
gMountedApexes.RemoveMountedApex(apex.GetManifest().name(), apex.GetPath(),
true);
};
auto scope_guard = android::base::make_scope_guard(cleaner);
auto result = verify_fn(temp_mount_point);
if (!result.ok()) {
return result.error();
}
if (!unmount_during_cleanup) {
scope_guard.Disable();
}
return {};
}
// Converts a list of apex file paths into a list of ApexFile objects
//
// Returns error when trying to open empty set of inputs.
Result<std::vector<ApexFile>> OpenApexFiles(
const std::vector<std::string>& paths) {
if (paths.empty()) {
return Errorf("Empty set of inputs");
}
std::vector<ApexFile> ret;
for (const std::string& path : paths) {
Result<ApexFile> apex_file = ApexFile::Open(path);
if (!apex_file.ok()) {
return apex_file.error();
}
ret.emplace_back(std::move(*apex_file));
}
return ret;
}
Result<void> ValidateStagingShimApex(const ApexFile& to) {
using android::base::StringPrintf;
auto system_shim = ApexFile::Open(
StringPrintf("%s/%s", kApexPackageSystemDir, shim::kSystemShimApexName));
if (!system_shim.ok()) {
return system_shim.error();
}
auto verify_fn = [&](const std::string& system_apex_path) {
return shim::ValidateUpdate(system_apex_path, to.GetPath());
};
return RunVerifyFnInsideTempMount(*system_shim, verify_fn, true);
}
// A version of apex verification that happens during boot.
// This function should only verification checks that are necessary to run on
// each boot. Try to avoid putting expensive checks inside this function.
Result<void> VerifyPackageBoot(const ApexFile& apex_file) {
// TODO(ioffe): why do we need this here?
auto& instance = ApexFileRepository::GetInstance();
auto public_key = instance.GetPublicKey(apex_file.GetManifest().name());
if (!public_key.ok()) {
return public_key.error();
}
Result<ApexVerityData> verity_or = apex_file.VerifyApexVerity(*public_key);
if (!verity_or.ok()) {
return verity_or.error();
}
if (shim::IsShimApex(apex_file)) {
// Validating shim is not a very cheap operation, but it's fine to perform
// it here since it only runs during CTS tests and will never be triggered
// during normal flow.
const auto& result = ValidateStagingShimApex(apex_file);
if (!result.ok()) {
return result;
}
}
return {};
}
static constexpr auto kSepolicyApexName = "com.android.sepolicy.apex";
// A version of apex verification that happens on SubmitStagedSession.
// This function contains checks that might be expensive to perform, e.g. temp
// mounting a package and reading entire dm-verity device, and shouldn't be run
// during boot.
Result<void> VerifyPackageStagedInstall(const ApexFile& apex_file) {
const auto& verify_package_boot_status = VerifyPackageBoot(apex_file);
if (!verify_package_boot_status.ok()) {
return verify_package_boot_status;
}
const auto validate_fn = [&apex_file](const std::string& mount_point) {
if (apex_file.GetManifest().name() == kSepolicyApexName) {
return CopySepolicyToMetadata(mount_point);
}
return Result<void>{};
};
return RunVerifyFnInsideTempMount(apex_file, validate_fn, false);
}
template <typename VerifyApexFn>
Result<std::vector<ApexFile>> VerifyPackages(
const std::vector<std::string>& paths, const VerifyApexFn& verify_apex_fn) {
Result<std::vector<ApexFile>> apex_files = OpenApexFiles(paths);
if (!apex_files.ok()) {
return apex_files.error();
}
LOG(DEBUG) << "VerifyPackages() for " << Join(paths, ',');
for (const ApexFile& apex_file : *apex_files) {
Result<void> result = verify_apex_fn(apex_file);
if (!result.ok()) {
return result.error();
}
}
return std::move(*apex_files);
}
Result<ApexFile> VerifySessionDir(int session_id) {
std::string session_dir_path =
StringPrintf("%s/session_%d", gConfig->staged_session_dir, session_id);
LOG(INFO) << "Scanning " << session_dir_path
<< " looking for packages to be validated";
Result<std::vector<std::string>> scan =
FindFilesBySuffix(session_dir_path, {kApexPackageSuffix});
if (!scan.ok()) {
LOG(WARNING) << scan.error();
return scan.error();
}
if (scan->size() > 1) {
return Errorf(
"More than one APEX package found in the same session directory.");
}
auto verified = VerifyPackages(*scan, VerifyPackageStagedInstall);
if (!verified.ok()) {
return verified.error();
}
return std::move((*verified)[0]);
}
Result<void> DeleteBackup() {
auto exists = PathExists(std::string(kApexBackupDir));
if (!exists.ok()) {
return Error() << "Can't clean " << kApexBackupDir << " : "
<< exists.error();
}
if (!*exists) {
LOG(DEBUG) << kApexBackupDir << " does not exist. Nothing to clean";
return {};
}
return DeleteDirContent(std::string(kApexBackupDir));
}
Result<void> BackupActivePackages() {
LOG(DEBUG) << "Initializing backup of " << gConfig->active_apex_data_dir;
// Previous restore might've delete backups folder.
auto create_status = CreateDirIfNeeded(kApexBackupDir, 0700);
if (!create_status.ok()) {
return Error() << "Backup failed : " << create_status.error();
}
auto apex_active_exists =
PathExists(std::string(gConfig->active_apex_data_dir));
if (!apex_active_exists.ok()) {
return Error() << "Backup failed : " << apex_active_exists.error();
}
if (!*apex_active_exists) {
LOG(DEBUG) << gConfig->active_apex_data_dir
<< " does not exist. Nothing to backup";
return {};
}
auto active_packages =
FindFilesBySuffix(gConfig->active_apex_data_dir, {kApexPackageSuffix});
if (!active_packages.ok()) {
return Error() << "Backup failed : " << active_packages.error();
}
auto cleanup_status = DeleteBackup();
if (!cleanup_status.ok()) {
return Error() << "Backup failed : " << cleanup_status.error();
}
auto backup_path_fn = [](const ApexFile& apex_file) {
return StringPrintf("%s/%s%s", kApexBackupDir,
GetPackageId(apex_file.GetManifest()).c_str(),
kApexPackageSuffix);
};
auto deleter = []() {
auto result = DeleteDirContent(std::string(kApexBackupDir));
if (!result.ok()) {
LOG(ERROR) << "Failed to cleanup " << kApexBackupDir << " : "
<< result.error();
}
};
auto scope_guard = android::base::make_scope_guard(deleter);
for (const std::string& path : *active_packages) {
Result<ApexFile> apex_file = ApexFile::Open(path);
if (!apex_file.ok()) {
return Error() << "Backup failed : " << apex_file.error();
}
const auto& dest_path = backup_path_fn(*apex_file);
if (link(apex_file->GetPath().c_str(), dest_path.c_str()) != 0) {
return ErrnoError() << "Failed to backup " << apex_file->GetPath();
}
}
scope_guard.Disable(); // Accept the backup.
return {};
}
Result<void> RestoreActivePackages() {
LOG(DEBUG) << "Initializing restore of " << gConfig->active_apex_data_dir;
auto backup_exists = PathExists(std::string(kApexBackupDir));
if (!backup_exists.ok()) {
return backup_exists.error();
}
if (!*backup_exists) {
return Error() << kApexBackupDir << " does not exist";
}
struct stat stat_data;
if (stat(gConfig->active_apex_data_dir, &stat_data) != 0) {
return ErrnoError() << "Failed to access " << gConfig->active_apex_data_dir;
}
LOG(DEBUG) << "Deleting existing packages in "
<< gConfig->active_apex_data_dir;
auto delete_status =
DeleteDirContent(std::string(gConfig->active_apex_data_dir));
if (!delete_status.ok()) {
return delete_status;
}
LOG(DEBUG) << "Renaming " << kApexBackupDir << " to "
<< gConfig->active_apex_data_dir;
if (rename(kApexBackupDir, gConfig->active_apex_data_dir) != 0) {
return ErrnoError() << "Failed to rename " << kApexBackupDir << " to "
<< gConfig->active_apex_data_dir;
}
LOG(DEBUG) << "Restoring original permissions for "
<< gConfig->active_apex_data_dir;
if (chmod(gConfig->active_apex_data_dir, stat_data.st_mode & ALLPERMS) != 0) {
return ErrnoError() << "Failed to restore original permissions for "
<< gConfig->active_apex_data_dir;
}
return {};
}
Result<void> UnmountPackage(const ApexFile& apex, bool allow_latest,
bool deferred) {
LOG(INFO) << "Unmounting " << GetPackageId(apex.GetManifest());
const ApexManifest& manifest = apex.GetManifest();
std::optional<MountedApexData> data;
bool latest = false;
auto fn = [&](const MountedApexData& d, bool l) {
if (d.full_path == apex.GetPath()) {
data.emplace(d);
latest = l;
}
};
gMountedApexes.ForallMountedApexes(manifest.name(), fn);
if (!data) {
return Error() << "Did not find " << apex.GetPath();
}
// Concept of latest sharedlibs apex is somewhat blurred. Since this is only
// used in testing, it is ok to always allow unmounting sharedlibs apex.
if (latest && !manifest.providesharedapexlibs()) {
if (!allow_latest) {
return Error() << "Package " << apex.GetPath() << " is active";
}
std::string mount_point = apexd_private::GetActiveMountPoint(manifest);
LOG(INFO) << "Unmounting " << mount_point;
if (umount2(mount_point.c_str(), UMOUNT_NOFOLLOW) != 0) {
return ErrnoError() << "Failed to unmount " << mount_point;
}
if (!deferred) {
if (rmdir(mount_point.c_str()) != 0) {
PLOG(ERROR) << "Failed to rmdir " << mount_point;
}
}
}
// Clean up gMountedApexes now, even though we're not fully done.
gMountedApexes.RemoveMountedApex(manifest.name(), apex.GetPath());
return Unmount(*data, deferred);
}
} // namespace
void SetConfig(const ApexdConfig& config) { gConfig = config; }
Result<void> MountPackage(const ApexFile& apex, const std::string& mount_point,
const std::string& device_name, bool reuse_device,
bool temp_mount) {
auto ret =
MountPackageImpl(apex, mount_point, device_name,
GetHashTreeFileName(apex, /* is_new= */ false),
/* verify_image = */ false, reuse_device, temp_mount);
if (!ret.ok()) {
return ret.error();
}
gMountedApexes.AddMountedApex(apex.GetManifest().name(), false, *ret);
return {};
}
namespace apexd_private {
Result<void> UnmountTempMount(const ApexFile& apex) {
const ApexManifest& manifest = apex.GetManifest();
LOG(VERBOSE) << "Unmounting all temp mounts for package " << manifest.name();
bool finished_unmounting = false;
// If multiple temp mounts exist, ensure that all are unmounted.
while (!finished_unmounting) {
Result<MountedApexData> data =
apexd_private::GetTempMountedApexData(manifest.name());
if (!data.ok()) {
finished_unmounting = true;
} else {
gMountedApexes.RemoveMountedApex(manifest.name(), data->full_path, true);
Unmount(*data, /* deferred= */ false);
}
}
return {};
}
Result<MountedApexData> GetTempMountedApexData(const std::string& package) {
bool found = false;
Result<MountedApexData> mount_data;
gMountedApexes.ForallMountedApexes(
package,
[&](const MountedApexData& data, [[maybe_unused]] bool latest) {
if (!found) {
mount_data = data;
found = true;
}
},
true);
if (found) {
return mount_data;
}
return Error() << "No temp mount data found for " << package;
}
bool IsMounted(const std::string& full_path) {
bool found_mounted = false;
gMountedApexes.ForallMountedApexes([&](const std::string&,
const MountedApexData& data,
[[maybe_unused]] bool latest) {
if (full_path == data.full_path) {
found_mounted = true;
}
});
return found_mounted;
}
std::string GetPackageMountPoint(const ApexManifest& manifest) {
return StringPrintf("%s/%s", kApexRoot, GetPackageId(manifest).c_str());
}
std::string GetPackageTempMountPoint(const ApexManifest& manifest) {
return StringPrintf("%s.tmp", GetPackageMountPoint(manifest).c_str());
}
std::string GetActiveMountPoint(const ApexManifest& manifest) {
return StringPrintf("%s/%s", kApexRoot, manifest.name().c_str());
}
} // namespace apexd_private
Result<void> ResumeRevertIfNeeded() {
auto sessions =
ApexSession::GetSessionsInState(SessionState::REVERT_IN_PROGRESS);
if (sessions.empty()) {
return {};
}
return RevertActiveSessions("", "");
}
Result<void> ActivateSharedLibsPackage(const std::string& mount_point) {
for (const auto& lib_path : {"lib", "lib64"}) {
std::string apex_lib_path = mount_point + "/" + lib_path;
auto lib_dir = PathExists(apex_lib_path);
if (!lib_dir.ok() || !*lib_dir) {
continue;
}
auto iter = std::filesystem::directory_iterator(apex_lib_path);
std::error_code ec;
while (iter != std::filesystem::end(iter)) {
const auto& lib_entry = *iter;
if (!lib_entry.is_directory()) {
iter = iter.increment(ec);
if (ec) {
return Error() << "Failed to scan " << apex_lib_path << " : "
<< ec.message();
}
continue;
}
const auto library_name = lib_entry.path().filename();
const std::string library_symlink_dir =
StringPrintf("%s/%s/%s/%s", kApexRoot, kApexSharedLibsSubDir,
lib_path, library_name.c_str());
auto symlink_dir = PathExists(library_symlink_dir);
if (!symlink_dir.ok() || !*symlink_dir) {
std::filesystem::create_directory(library_symlink_dir, ec);
if (ec) {
return Error() << "Failed to create directory " << library_symlink_dir
<< ": " << ec.message();
}
}
auto inner_iter =
std::filesystem::directory_iterator(lib_entry.path().string());
while (inner_iter != std::filesystem::end(inner_iter)) {
const auto& lib_items = *inner_iter;
const auto hash_value = lib_items.path().filename();
const std::string library_symlink_hash = StringPrintf(
"%s/%s", library_symlink_dir.c_str(), hash_value.c_str());
auto hash_dir = PathExists(library_symlink_hash);
if (hash_dir.ok() && *hash_dir) {
// Compare file size for two library files with same name and hash
// value
auto existing_file_path =
library_symlink_hash + "/" + library_name.string();
auto existing_file_size = GetFileSize(existing_file_path);
if (!existing_file_size.ok()) {
return existing_file_size.error();
}
auto new_file_path =
lib_items.path().string() + "/" + library_name.string();
auto new_file_size = GetFileSize(new_file_path);
if (!new_file_size.ok()) {
return new_file_size.error();
}
if (*existing_file_size != *new_file_size) {
return Error() << "There are two libraries with same hash and "
"different file size : "
<< existing_file_path << " and " << new_file_path;
}
inner_iter = inner_iter.increment(ec);
if (ec) {
return Error() << "Failed to scan " << lib_entry.path().string()
<< " : " << ec.message();
}
continue;
}
std::filesystem::create_directory_symlink(lib_items.path(),
library_symlink_hash, ec);
if (ec) {
return Error() << "Failed to create symlink from " << lib_items.path()
<< " to " << library_symlink_hash << ec.message();
}
inner_iter = inner_iter.increment(ec);
if (ec) {
return Error() << "Failed to scan " << lib_entry.path().string()
<< " : " << ec.message();
}
}
iter = iter.increment(ec);
if (ec) {
return Error() << "Failed to scan " << apex_lib_path << " : "
<< ec.message();
}
}
}
return {};
}
bool IsValidPackageName(const std::string& package_name) {
return kBannedApexName.count(package_name) == 0;
}
Result<void> ActivatePackageImpl(const ApexFile& apex_file,
const std::string& device_name,
bool reuse_device) {
ATRACE_NAME("ActivatePackageImpl");
const ApexManifest& manifest = apex_file.GetManifest();
if (!IsValidPackageName(manifest.name())) {
return Errorf("Package name {} is not allowed.", manifest.name());
}
// Validate upgraded shim apex
if (shim::IsShimApex(apex_file) &&
!ApexFileRepository::GetInstance().IsPreInstalledApex(apex_file)) {
// This is not cheap for shim apex, but it is fine here since we have
// upgraded shim apex only during CTS tests.
Result<void> result = VerifyPackageBoot(apex_file);
if (!result.ok()) {
LOG(ERROR) << "Failed to validate shim apex: " << apex_file.GetPath();
return result;
}
}
// 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 version_found_mounted = false;
{
uint64_t new_version = manifest.version();
bool version_found_active = false;
gMountedApexes.ForallMountedApexes(
manifest.name(), [&](const MountedApexData& data, bool latest) {
Result<ApexFile> other_apex = ApexFile::Open(data.full_path);
if (!other_apex.ok()) {
return;
}
if (static_cast<uint64_t>(other_apex->GetManifest().version()) ==
new_version) {
version_found_mounted = true;
version_found_active = latest;
}
if (static_cast<uint64_t>(other_apex->GetManifest().version()) >
new_version) {
is_newest_version = false;
}
});
// If the package provides shared libraries to other APEXs, we need to
// activate all versions available (i.e. preloaded on /system/apex and
// available on /data/apex/active). The reason is that there might be some
// APEXs loaded from /system/apex that reference the libraries contained on
// the preloaded version of the apex providing shared libraries.
if (version_found_active && !manifest.providesharedapexlibs()) {
LOG(DEBUG) << "Package " << manifest.name() << " with version "
<< manifest.version() << " already active";
return {};
}
}
const std::string& mount_point =
apexd_private::GetPackageMountPoint(manifest);
if (!version_found_mounted) {
auto mount_status = MountPackage(apex_file, mount_point, device_name,
reuse_device, /*temp_mount=*/false);
if (!mount_status.ok()) {
return mount_status;
}
}
// For packages providing shared libraries, avoid creating a bindmount since
// there is no use for the /apex/<package_name> directory. However, mark the
// highest version as latest so that the latest version of the package can be
// properly reported to PackageManager.
if (manifest.providesharedapexlibs()) {
if (is_newest_version) {
gMountedApexes.SetLatest(manifest.name(), apex_file.GetPath());
}
} else {
bool mounted_latest = false;
// Bind mount the latest version to /apex/<package_name>, unless the
// package provides shared libraries to other APEXs.
if (is_newest_version) {
const Result<void>& update_st = apexd_private::BindMount(
apexd_private::GetActiveMountPoint(manifest), mount_point);
mounted_latest = update_st.has_value();
if (!update_st.ok()) {
return Error() << "Failed to update package " << manifest.name()
<< " to version " << manifest.version() << " : "
<< update_st.error();
}
}
if (mounted_latest) {
gMountedApexes.SetLatest(manifest.name(), apex_file.GetPath());
}
}
if (manifest.providesharedapexlibs()) {
const auto& handle_shared_libs_apex =
ActivateSharedLibsPackage(mount_point);
if (!handle_shared_libs_apex.ok()) {
return handle_shared_libs_apex;
}
}
LOG(DEBUG) << "Successfully activated " << apex_file.GetPath()
<< " package_name: " << manifest.name()
<< " version: " << manifest.version();
return {};
}
Result<void> ActivatePackage(const std::string& full_path) {
LOG(INFO) << "Trying to activate " << full_path;
Result<ApexFile> apex_file = ApexFile::Open(full_path);
if (!apex_file.ok()) {
return apex_file.error();
}
return ActivatePackageImpl(*apex_file, GetPackageId(apex_file->GetManifest()),
/* reuse_device= */ false);
}
Result<void> DeactivatePackage(const std::string& full_path) {
LOG(INFO) << "Trying to deactivate " << full_path;
Result<ApexFile> apex_file = ApexFile::Open(full_path);
if (!apex_file.ok()) {
return apex_file.error();
}
return UnmountPackage(*apex_file, /* allow_latest= */ true,
/* deferred= */ false);
}
Result<std::vector<ApexFile>> GetStagedApexFiles(
int session_id, const std::vector<int>& child_session_ids) {
auto session = ApexSession::GetSession(session_id);
if (!session.ok()) {
return session.error();
}
// We should only accept sessions in SessionState::STAGED state
auto session_state = (*session).GetState();
if (session_state != SessionState::STAGED) {
return Error() << "Session " << session_id << " is not in state STAGED";
}
std::vector<int> ids_to_scan;
if (!child_session_ids.empty()) {
ids_to_scan = child_session_ids;
} else {
ids_to_scan = {session_id};
}
// Find apex files in the staging directory
std::vector<std::string> apex_file_paths;
for (int id_to_scan : ids_to_scan) {
std::string session_dir_path = std::string(gConfig->staged_session_dir) +
"/session_" + std::to_string(id_to_scan);
Result<std::vector<std::string>> scan =
FindFilesBySuffix(session_dir_path, {kApexPackageSuffix});
if (!scan.ok()) {
return scan.error();
}
if (scan->size() != 1) {
return Error() << "Expected exactly one APEX file in directory "
<< session_dir_path << ". Found: " << scan->size();
}
std::string& apex_file_path = (*scan)[0];
apex_file_paths.push_back(std::move(apex_file_path));
}
return OpenApexFiles(apex_file_paths);
}
Result<ClassPath> MountAndDeriveClassPath(
const std::vector<ApexFile>& apex_files) {
auto guard = android::base::make_scope_guard([&]() {
for (const auto& apex : apex_files) {
apexd_private::UnmountTempMount(apex);
}
});
// Mount the staged apex files
std::vector<std::string> temp_mounted_apex_paths;
for (const auto& apex : apex_files) {
const std::string& temp_mount_point =
apexd_private::GetPackageTempMountPoint(apex.GetManifest());
const std::string& package_id = GetPackageId(apex.GetManifest());
const std::string& temp_device_name = package_id + ".tmp";
auto mount_status =
MountPackage(apex, temp_mount_point, temp_device_name,
/*reuse_device=*/false, /*temp_mount=*/true);
if (!mount_status.ok()) {
return mount_status.error();
}
temp_mounted_apex_paths.push_back(temp_mount_point);
}
// Calculate classpaths of temp mounted staged apexs
return ClassPath::DeriveClassPath(temp_mounted_apex_paths);
}
std::vector<ApexFile> GetActivePackages() {
std::vector<ApexFile> ret;
gMountedApexes.ForallMountedApexes(
[&](const std::string&, const MountedApexData& data, bool latest) {
if (!latest) {
return;
}
Result<ApexFile> apex_file = ApexFile::Open(data.full_path);
if (!apex_file.ok()) {
return;
}
ret.emplace_back(std::move(*apex_file));
});
return ret;
}
std::vector<ApexFile> CalculateInactivePackages(
const std::vector<ApexFile>& active) {
std::vector<ApexFile> inactive = GetFactoryPackages();
auto new_end = std::remove_if(
inactive.begin(), inactive.end(), [&active](const ApexFile& apex) {
return std::any_of(active.begin(), active.end(),
[&apex](const ApexFile& active_apex) {
return apex.GetPath() == active_apex.GetPath();
});
});
inactive.erase(new_end, inactive.end());
return std::move(inactive);
}
Result<void> EmitApexInfoList(bool is_bootstrap) {
// on a non-updatable device, we don't have APEX database to emit
if (!android::sysprop::ApexProperties::updatable().value_or(false)) {
return {};
}
// Apexd runs both in "bootstrap" and "default" mount namespace.
// To expose /apex/apex-info-list.xml separately in each mount namespaces,
// we write /apex/.<namespace>-apex-info-list .xml file first and then
// bind mount it to the canonical file (/apex/apex-info-list.xml).
const std::string file_name =
fmt::format("{}/.{}-{}", kApexRoot,
is_bootstrap ? "bootstrap" : "default", kApexInfoList);
unique_fd fd(TEMP_FAILURE_RETRY(
open(file_name.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0644)));
if (fd.get() == -1) {
return ErrnoErrorf("Can't open {}", file_name);
}
const std::vector<ApexFile> active(GetActivePackages());
std::vector<ApexFile> inactive;
// we skip for non-activated built-in apexes in bootstrap mode
// in order to avoid boottime increase
if (!is_bootstrap) {
inactive = CalculateInactivePackages(active);
}
std::stringstream xml;
CollectApexInfoList(xml, active, inactive);
if (!android::base::WriteStringToFd(xml.str(), fd)) {
return ErrnoErrorf("Can't write to {}", file_name);
}
fd.reset();
const std::string mount_point =
fmt::format("{}/{}", kApexRoot, kApexInfoList);
if (access(mount_point.c_str(), F_OK) != 0) {
close(open(mount_point.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC,
0644));
}
if (mount(file_name.c_str(), mount_point.c_str(), nullptr, MS_BIND,
nullptr) == -1) {
return ErrnoErrorf("Can't bind mount {} to {}", file_name, mount_point);
}
return RestoreconPath(file_name);
}
namespace {
std::unordered_map<std::string, uint64_t> GetActivePackagesMap() {
std::vector<ApexFile> active_packages = GetActivePackages();
std::unordered_map<std::string, uint64_t> ret;
for (const auto& package : active_packages) {
const ApexManifest& manifest = package.GetManifest();
ret.insert({manifest.name(), manifest.version()});
}
return ret;
}
} // namespace
std::vector<ApexFile> GetFactoryPackages() {
std::vector<ApexFile> ret;
// Decompressed APEX is considered factory package
std::vector<std::string> decompressed_pkg_names;
auto active_pkgs = GetActivePackages();
for (ApexFile& apex : active_pkgs) {
if (ApexFileRepository::GetInstance().IsDecompressedApex(apex)) {
decompressed_pkg_names.push_back(apex.GetManifest().name());
ret.emplace_back(std::move(apex));
}
}
for (const auto& dir : gConfig->apex_built_in_dirs) {
auto all_apex_files = FindFilesBySuffix(
dir, {kApexPackageSuffix, kCompressedApexPackageSuffix});
if (!all_apex_files.ok()) {
LOG(ERROR) << all_apex_files.error();
continue;
}
for (const std::string& path : *all_apex_files) {
Result<ApexFile> apex_file = ApexFile::Open(path);
if (!apex_file.ok()) {
LOG(ERROR) << apex_file.error();
continue;
}
// Ignore compressed APEX if it has been decompressed already
if (apex_file->IsCompressed() &&
std::find(decompressed_pkg_names.begin(),
decompressed_pkg_names.end(),
apex_file->GetManifest().name()) !=
decompressed_pkg_names.end()) {
continue;
}
ret.emplace_back(std::move(*apex_file));
}
}
return ret;
}
Result<ApexFile> GetActivePackage(const std::string& packageName) {
std::vector<ApexFile> packages = GetActivePackages();
for (ApexFile& apex : packages) {
if (apex.GetManifest().name() == packageName) {
return std::move(apex);
}
}
return ErrnoError() << "Cannot find matching package for: " << packageName;
}
Result<void> DeleteStagedSepolicy() {
const auto staged_dir =
std::string(gConfig->metadata_sepolicy_staged_dir) + "/";
LOG(DEBUG) << "Deleting " << staged_dir;
std::error_code ec;
auto removed = std::filesystem::remove_all(staged_dir, ec);
if (removed == 0) {
LOG(INFO) << staged_dir << " already deleted.";
} else if (ec) {
return Error() << "Failed to clear " << staged_dir << ": " << ec.message();
}
return {};
}
/**
* Abort individual staged session.
*
* Returns without error only if session was successfully aborted.
**/
Result<void> AbortStagedSession(int session_id) {
auto session = ApexSession::GetSession(session_id);
if (!session.ok()) {
return Error() << "No session found with id " << session_id;
}
const auto& apex_names = session->GetApexNames();
if (std::find(std::begin(apex_names), std::end(apex_names),
kSepolicyApexName) != std::end(apex_names)) {
const auto result = DeleteStagedSepolicy();
if (!result.ok()) {
return result.error();
}
}
switch (session->GetState()) {
case SessionState::VERIFIED:
[[clang::fallthrough]];
case SessionState::STAGED:
return session->DeleteSession();
default:
return Error() << "Session " << *session << " can't be aborted";
}
}
namespace {
enum ActivationMode { kBootstrapMode = 0, kBootMode, kOtaChrootMode, kVmMode };
std::vector<Result<void>> ActivateApexWorker(
ActivationMode mode, std::queue<const ApexFile*>& apex_queue,
std::mutex& mutex) {
ATRACE_NAME("ActivateApexWorker");
std::vector<Result<void>> ret;
while (true) {
const ApexFile* apex;
{
std::lock_guard lock(mutex);
if (apex_queue.empty()) break;
apex = apex_queue.front();
apex_queue.pop();
}
std::string device_name;
if (mode == ActivationMode::kBootMode) {
device_name = apex->GetManifest().name();
} else {
device_name = GetPackageId(apex->GetManifest());
}
if (mode == ActivationMode::kOtaChrootMode) {
device_name += ".chroot";
}
bool reuse_device = mode == ActivationMode::kBootMode;
auto res = ActivatePackageImpl(*apex, device_name, reuse_device);
if (!res.ok()) {
ret.push_back(Error() << "Failed to activate " << apex->GetPath() << "("
<< device_name << "): " << res.error());
} else {
ret.push_back({});
}
}
return ret;
}
Result<void> ActivateApexPackages(const std::vector<ApexFileRef>& apexes,
ActivationMode mode) {
ATRACE_NAME("ActivateApexPackages");
std::queue<const ApexFile*> apex_queue;
std::mutex apex_queue_mutex;
for (const ApexFile& apex : apexes) {
apex_queue.emplace(&apex);
}
// Creates threads as many as half number of cores for the performance.
size_t worker_num = std::max(get_nprocs_conf() >> 1, 1);
worker_num = std::min(apex_queue.size(), worker_num);
// On -eng builds there might be two different pre-installed art apexes.
// Attempting to activate them in parallel will result in UB (e.g.
// apexd-bootstrap might crash). In order to avoid this, for the time being on
// -eng builds activate apexes sequentially.
// TODO(b/176497601): remove this.
if (GetProperty("ro.build.type", "") == "eng") {
worker_num = 1;
}
std::vector<std::future<std::vector<Result<void>>>> futures;
futures.reserve(worker_num);
for (size_t i = 0; i < worker_num; i++) {
futures.push_back(std::async(std::launch::async, ActivateApexWorker,
std::ref(mode), std::ref(apex_queue),
std::ref(apex_queue_mutex)));
}
size_t activated_cnt = 0;
size_t failed_cnt = 0;
std::string error_message;
for (size_t i = 0; i < futures.size(); i++) {
for (const auto& res : futures[i].get()) {
if (res.ok()) {
++activated_cnt;
} else {
++failed_cnt;
LOG(ERROR) << res.error();
if (failed_cnt == 1) {
error_message = res.error().message();
}
}
}
}
if (failed_cnt > 0) {
return Error() << "Failed to activate " << failed_cnt
<< " APEX packages. One of the errors: " << error_message;
}
LOG(INFO) << "Activated " << activated_cnt << " packages.";
return {};
}
// A fallback function in case some of the apexes failed to activate. For all
// such apexes that were coming from /data partition we will attempt to activate
// their corresponding pre-installed copies.
Result<void> ActivateMissingApexes(const std::vector<ApexFileRef>& apexes,
ActivationMode mode) {
LOG(INFO) << "Trying to activate pre-installed versions of missing apexes";
const auto& file_repository = ApexFileRepository::GetInstance();
const auto& activated_apexes = GetActivePackagesMap();
std::vector<ApexFileRef> fallback_apexes;
for (const auto& apex_ref : apexes) {
const auto& apex = apex_ref.get();
if (apex.GetManifest().providesharedapexlibs()) {
// We must mount both versions of sharedlibs apex anyway. Not much we can
// do here.
continue;
}
if (file_repository.IsPreInstalledApex(apex)) {
// We tried to activate pre-installed apex in the first place. No need to
// try again.
continue;
}
const std::string& name = apex.GetManifest().name();
if (activated_apexes.find(name) == activated_apexes.end()) {
fallback_apexes.push_back(file_repository.GetPreInstalledApex(name));
}
}
// Process compressed APEX, if any
std::vector<ApexFileRef> compressed_apex;
for (auto it = fallback_apexes.begin(); it != fallback_apexes.end();) {
if (it->get().IsCompressed()) {
compressed_apex.emplace_back(*it);
it = fallback_apexes.erase(it);
} else {
it++;
}
}
std::vector<ApexFile> decompressed_apex;
if (!compressed_apex.empty()) {
decompressed_apex = ProcessCompressedApex(
compressed_apex,
/* is_ota_chroot= */ mode == ActivationMode::kOtaChrootMode);
for (const ApexFile& apex_file : decompressed_apex) {
fallback_apexes.emplace_back(std::cref(apex_file));
}
}
if (mode == kBootMode) {
// Treat fallback to pre-installed APEXes as a change of the acitve APEX,
// since we are already in a pretty dire situation, so it's better if we
// drop all the caches.
for (const auto& apex : fallback_apexes) {
gChangedActiveApexes.insert(apex.get().GetManifest().name());
}
}
return ActivateApexPackages(fallback_apexes, mode);
}
} // namespace
/**
* Snapshots data from base_dir/apexdata/<apex name> to
* base_dir/apexrollback/<rollback id>/<apex name>.
*/
Result<void> SnapshotDataDirectory(const std::string& base_dir,
const int rollback_id,
const std::string& apex_name,
bool pre_restore = false) {
auto rollback_path =
StringPrintf("%s/%s/%d%s", base_dir.c_str(), kApexSnapshotSubDir,
rollback_id, pre_restore ? kPreRestoreSuffix : "");
const Result<void> result = CreateDirIfNeeded(rollback_path, 0700);
if (!result.ok()) {
return Error() << "Failed to create snapshot directory for rollback "
<< rollback_id << " : " << result.error();
}
auto from_path = StringPrintf("%s/%s/%s", base_dir.c_str(), kApexDataSubDir,
apex_name.c_str());
auto to_path =
StringPrintf("%s/%s", rollback_path.c_str(), apex_name.c_str());
return ReplaceFiles(from_path, to_path);
}
/**
* Restores snapshot from base_dir/apexrollback/<rollback id>/<apex name>
* to base_dir/apexdata/<apex name>.
* Note the snapshot will be deleted after restoration succeeded.
*/
Result<void> RestoreDataDirectory(const std::string& base_dir,
const int rollback_id,
const std::string& apex_name,
bool pre_restore = false) {
auto from_path = StringPrintf(
"%s/%s/%d%s/%s", base_dir.c_str(), kApexSnapshotSubDir, rollback_id,
pre_restore ? kPreRestoreSuffix : "", apex_name.c_str());
auto to_path = StringPrintf("%s/%s/%s", base_dir.c_str(), kApexDataSubDir,
apex_name.c_str());
Result<void> result = ReplaceFiles(from_path, to_path);
if (!result.ok()) {
return result;
}
result = RestoreconPath(to_path);
if (!result.ok()) {
return result;
}
result = DeleteDir(from_path);
if (!result.ok()) {
LOG(ERROR) << "Failed to delete the snapshot: " << result.error();
}
return {};
}
void SnapshotOrRestoreDeIfNeeded(const std::string& base_dir,
const ApexSession& session) {
if (session.HasRollbackEnabled()) {
for (const auto& apex_name : session.GetApexNames()) {
Result<void> result =
SnapshotDataDirectory(base_dir, session.GetRollbackId(), apex_name);
if (!result.ok()) {
LOG(ERROR) << "Snapshot failed for " << apex_name << ": "
<< result.error();
}
}
} else if (session.IsRollback()) {
for (const auto& apex_name : session.GetApexNames()) {
if (!gSupportsFsCheckpoints) {
// Snapshot before restore so this rollback can be reverted.
SnapshotDataDirectory(base_dir, session.GetRollbackId(), apex_name,
true /* pre_restore */);
}
Result<void> result =
RestoreDataDirectory(base_dir, session.GetRollbackId(), apex_name);
if (!result.ok()) {
LOG(ERROR) << "Restore of data failed for " << apex_name << ": "
<< result.error();
}
}
}
}
void SnapshotOrRestoreDeSysData() {
auto sessions = ApexSession::GetSessionsInState(SessionState::ACTIVATED);
for (const ApexSession& session : sessions) {
SnapshotOrRestoreDeIfNeeded(kDeSysDataDir, session);
}
}
int SnapshotOrRestoreDeUserData() {
auto user_dirs = GetDeUserDirs();
if (!user_dirs.ok()) {
LOG(ERROR) << "Error reading dirs " << user_dirs.error();
return 1;
}
auto sessions = ApexSession::GetSessionsInState(SessionState::ACTIVATED);
for (const ApexSession& session : sessions) {
for (const auto& user_dir : *user_dirs) {
SnapshotOrRestoreDeIfNeeded(user_dir, session);
}
}
return 0;
}
Result<void> SnapshotCeData(const int user_id, const int rollback_id,
const std::string& apex_name) {
auto base_dir = StringPrintf("%s/%d", kCeDataDir, user_id);
return SnapshotDataDirectory(base_dir, rollback_id, apex_name);
}
Result<void> RestoreCeData(const int user_id, const int rollback_id,
const std::string& apex_name) {
auto base_dir = StringPrintf("%s/%d", kCeDataDir, user_id);
return RestoreDataDirectory(base_dir, rollback_id, apex_name);
}
// Migrates sessions directory from /data/apex/sessions to
// /metadata/apex/sessions, if necessary.
Result<void> MigrateSessionsDirIfNeeded() {
return ApexSession::MigrateToMetadataSessionsDir();
}
Result<void> DestroySnapshots(const std::string& base_dir,
const int rollback_id) {
auto path = StringPrintf("%s/%s/%d", base_dir.c_str(), kApexSnapshotSubDir,
rollback_id);
return DeleteDir(path);
}
Result<void> DestroyDeSnapshots(const int rollback_id) {
DestroySnapshots(kDeSysDataDir, rollback_id);
auto user_dirs = GetDeUserDirs();
if (!user_dirs.ok()) {
return Error() << "Error reading user dirs " << user_dirs.error();
}
for (const auto& user_dir : *user_dirs) {
DestroySnapshots(user_dir, rollback_id);
}
return {};
}
Result<void> DestroyCeSnapshots(const int user_id, const int rollback_id) {
auto path = StringPrintf("%s/%d/%s/%d", kCeDataDir, user_id,
kApexSnapshotSubDir, rollback_id);
return DeleteDir(path);
}
/**
* Deletes all credential-encrypted snapshots for the given user, except for
* those listed in retain_rollback_ids.
*/
Result<void> DestroyCeSnapshotsNotSpecified(
int user_id, const std::vector<int>& retain_rollback_ids) {
auto snapshot_root =
StringPrintf("%s/%d/%s", kCeDataDir, user_id, kApexSnapshotSubDir);
auto snapshot_dirs = GetSubdirs(snapshot_root);
if (!snapshot_dirs.ok()) {
return Error() << "Error reading snapshot dirs " << snapshot_dirs.error();
}
for (const auto& snapshot_dir : *snapshot_dirs) {
uint snapshot_id;
bool parse_ok = ParseUint(
std::filesystem::path(snapshot_dir).filename().c_str(), &snapshot_id);
if (parse_ok &&
std::find(retain_rollback_ids.begin(), retain_rollback_ids.end(),
snapshot_id) == retain_rollback_ids.end()) {
Result<void> result = DeleteDir(snapshot_dir);
if (!result.ok()) {
return Error() << "Destroy CE snapshot failed for " << snapshot_dir
<< " : " << result.error();
}
}
}
return {};
}
void RestorePreRestoreSnapshotsIfPresent(const std::string& base_dir,
const ApexSession& session) {
auto pre_restore_snapshot_path =
StringPrintf("%s/%s/%d%s", base_dir.c_str(), kApexSnapshotSubDir,
session.GetRollbackId(), kPreRestoreSuffix);
if (PathExists(pre_restore_snapshot_path).ok()) {
for (const auto& apex_name : session.GetApexNames()) {
Result<void> result = RestoreDataDirectory(
base_dir, session.GetRollbackId(), apex_name, true /* pre_restore */);
if (!result.ok()) {
LOG(ERROR) << "Restore of pre-restore snapshot failed for " << apex_name
<< ": " << result.error();
}
}
}
}
void RestoreDePreRestoreSnapshotsIfPresent(const ApexSession& session) {
RestorePreRestoreSnapshotsIfPresent(kDeSysDataDir, session);
auto user_dirs = GetDeUserDirs();
if (!user_dirs.ok()) {
LOG(ERROR) << "Error reading user dirs to restore pre-restore snapshots"
<< user_dirs.error();
}
for (const auto& user_dir : *user_dirs) {
RestorePreRestoreSnapshotsIfPresent(user_dir, session);
}
}
void DeleteDePreRestoreSnapshots(const std::string& base_dir,
const ApexSession& session) {
auto pre_restore_snapshot_path =
StringPrintf("%s/%s/%d%s", base_dir.c_str(), kApexSnapshotSubDir,
session.GetRollbackId(), kPreRestoreSuffix);
Result<void> result = DeleteDir(pre_restore_snapshot_path);
if (!result.ok()) {
LOG(ERROR) << "Deletion of pre-restore snapshot failed: " << result.error();
}
}
void DeleteDePreRestoreSnapshots(const ApexSession& session) {
DeleteDePreRestoreSnapshots(kDeSysDataDir, session);
auto user_dirs = GetDeUserDirs();
if (!user_dirs.ok()) {
LOG(ERROR) << "Error reading user dirs to delete pre-restore snapshots"
<< user_dirs.error();
}
for (const auto& user_dir : *user_dirs) {
DeleteDePreRestoreSnapshots(user_dir, session);
}
}
void OnBootCompleted() {
ApexdLifecycle::GetInstance().MarkBootCompleted();
}
// Returns true if any session gets staged
void ScanStagedSessionsDirAndStage() {
LOG(INFO) << "Scanning " << ApexSession::GetSessionsDir()
<< " looking for sessions to be activated.";
auto sessions_to_activate =
ApexSession::GetSessionsInState(SessionState::STAGED);
if (gSupportsFsCheckpoints) {
// A session that is in the ACTIVATED state should still be re-activated if
// fs checkpointing is supported. In this case, a session may be in the
// ACTIVATED state yet the data/apex/active directory may have been
// reverted. The session should be reverted in this scenario.
auto activated_sessions =
ApexSession::GetSessionsInState(SessionState::ACTIVATED);
sessions_to_activate.insert(sessions_to_activate.end(),
activated_sessions.begin(),
activated_sessions.end());
}
for (auto& session : sessions_to_activate) {
auto session_id = session.GetId();
auto session_failed_fn = [&]() {
LOG(WARNING) << "Marking session " << session_id << " as failed.";
auto st = session.UpdateStateAndCommit(SessionState::ACTIVATION_FAILED);
if (!st.ok()) {
LOG(WARNING) << "Failed to mark session " << session_id
<< " as failed : " << st.error();
}
};
auto scope_guard = android::base::make_scope_guard(session_failed_fn);
std::string build_fingerprint = GetProperty(kBuildFingerprintSysprop, "");
if (session.GetBuildFingerprint().compare(build_fingerprint) != 0) {
auto error_message = "APEX build fingerprint has changed";
LOG(ERROR) << error_message;
session.SetErrorMessage(error_message);
continue;
}
// If device supports fs-checkpoint, then apex session should only be
// installed when in checkpoint-mode. Otherwise, we will not be able to
// revert /data on error.
if (gSupportsFsCheckpoints && !gInFsCheckpointMode) {
auto error_message =
"Cannot install apex session if not in fs-checkpoint mode";
LOG(ERROR) << error_message;
session.SetErrorMessage(error_message);
continue;
}
std::vector<std::string> dirs_to_scan;
if (session.GetChildSessionIds().empty()) {
dirs_to_scan.push_back(std::string(gConfig->staged_session_dir) +
"/session_" + std::to_string(session_id));
} else {
for (auto child_session_id : session.GetChildSessionIds()) {
dirs_to_scan.push_back(std::string(gConfig->staged_session_dir) +
"/session_" + std::to_string(child_session_id));
}
}
std::vector<std::string> apexes;
bool scan_successful = true;
for (const auto& dir_to_scan : dirs_to_scan) {
Result<std::vector<std::string>> scan =
FindFilesBySuffix(dir_to_scan, {kApexPackageSuffix});
if (!scan.ok()) {
LOG(WARNING) << scan.error();
session.SetErrorMessage(scan.error().message());
scan_successful = false;
break;
}
if (scan->size() > 1) {
std::string error_message = StringPrintf(
"More than one APEX package found in the same session directory %s "
", skipping activation",
dir_to_scan.c_str());
LOG(WARNING) << error_message;
session.SetErrorMessage(error_message);
scan_successful = false;
break;
}
if (scan->empty()) {
std::string error_message = StringPrintf(
"No APEX packages found while scanning %s session id: %d.",
dir_to_scan.c_str(), session_id);
LOG(WARNING) << error_message;
session.SetErrorMessage(error_message);
scan_successful = false;
break;
}
apexes.push_back(std::move((*scan)[0]));
}
if (!scan_successful) {
continue;
}
std::vector<std::string> staged_apex_names;
for (const auto& apex : apexes) {
// TODO(b/158470836): Avoid opening ApexFile repeatedly.
Result<ApexFile> apex_file = ApexFile::Open(apex);
if (!apex_file.ok()) {
LOG(ERROR) << "Cannot open apex file during staging: " << apex;
continue;
}
staged_apex_names.push_back(apex_file->GetManifest().name());
}
const Result<void> result = StagePackages(apexes);
if (!result.ok()) {
std::string error_message = StringPrintf(
"Activation failed for packages %s : %s", Join(apexes, ',').c_str(),
result.error().message().c_str());
LOG(ERROR) << error_message;
session.SetErrorMessage(error_message);
continue;
}
// Session was OK, release scopeguard.
scope_guard.Disable();
for (const std::string& apex : staged_apex_names) {
gChangedActiveApexes.insert(apex);
}
auto st = session.UpdateStateAndCommit(SessionState::ACTIVATED);
if (!st.ok()) {
LOG(ERROR) << "Failed to mark " << session
<< " as activated : " << st.error();
}
}
}
namespace {
std::string StageDestPath(const ApexFile& apex_file) {
return StringPrintf("%s/%s%s", gConfig->active_apex_data_dir,
GetPackageId(apex_file.GetManifest()).c_str(),
kApexPackageSuffix);
}
} // namespace
Result<void> StagePackages(const std::vector<std::string>& tmp_paths) {
if (tmp_paths.empty()) {
return Errorf("Empty set of inputs");
}
LOG(DEBUG) << "StagePackages() for " << Join(tmp_paths, ',');
// Note: this function is temporary. As such the code is not optimized, e.g.,
// it will open ApexFiles multiple times.
// 1) Verify all packages.
Result<std::vector<ApexFile>> apex_files = OpenApexFiles(tmp_paths);
if (!apex_files.ok()) {
return apex_files.error();
}
for (const ApexFile& apex_file : *apex_files) {
if (shim::IsShimApex(apex_file)) {
// Shim apex will be validated on every boot. No need to do it here.
continue;
}
Result<void> result = VerifyPackageBoot(apex_file);
if (!result.ok()) {
return result.error();
}
}
// Make sure that kActiveApexPackagesDataDir exists.
auto create_dir_status =
CreateDirIfNeeded(std::string(gConfig->active_apex_data_dir), 0755);
if (!create_dir_status.ok()) {
return create_dir_status.error();
}
// 2) Now stage all of them.
// Ensure the APEX gets removed on failure.
std::unordered_set<std::string> staged_files;
std::vector<std::string> changed_hashtree_files;
auto deleter = [&staged_files, &changed_hashtree_files]() {
for (const std::string& staged_path : staged_files) {
if (TEMP_FAILURE_RETRY(unlink(staged_path.c_str())) != 0) {
PLOG(ERROR) << "Unable to unlink " << staged_path;
}
}
for (const std::string& hashtree_file : changed_hashtree_files) {
if (TEMP_FAILURE_RETRY(unlink(hashtree_file.c_str())) != 0) {
PLOG(ERROR) << "Unable to unlink " << hashtree_file;
}
}
};
auto scope_guard = android::base::make_scope_guard(deleter);
std::unordered_set<std::string> staged_packages;
for (const ApexFile& apex_file : *apex_files) {
// First promote new hashtree file to the one that will be used when
// mounting apex.
std::string new_hashtree_file = GetHashTreeFileName(apex_file,
/* is_new = */ true);
std::string old_hashtree_file = GetHashTreeFileName(apex_file,
/* is_new = */ false);
if (access(new_hashtree_file.c_str(), F_OK) == 0) {
if (TEMP_FAILURE_RETRY(rename(new_hashtree_file.c_str(),
old_hashtree_file.c_str())) != 0) {
return ErrnoError() << "Failed to move " << new_hashtree_file << " to "
<< old_hashtree_file;
}
changed_hashtree_files.emplace_back(std::move(old_hashtree_file));
}
// And only then move apex to /data/apex/active.
std::string dest_path = StageDestPath(apex_file);
if (access(dest_path.c_str(), F_OK) == 0) {
LOG(DEBUG) << dest_path << " already exists. Deleting";
if (TEMP_FAILURE_RETRY(unlink(dest_path.c_str())) != 0) {
return ErrnoError() << "Failed to unlink " << dest_path;
}
}
if (link(apex_file.GetPath().c_str(), dest_path.c_str()) != 0) {
return ErrnoError() << "Unable to link " << apex_file.GetPath() << " to "
<< dest_path;
}
staged_files.insert(dest_path);
staged_packages.insert(apex_file.GetManifest().name());
LOG(DEBUG) << "Success linking " << apex_file.GetPath() << " to "
<< dest_path;
}
scope_guard.Disable(); // Accept the state.
return RemovePreviouslyActiveApexFiles(staged_packages, staged_files);
}
Result<void> UnstagePackages(const std::vector<std::string>& paths) {
if (paths.empty()) {
return Errorf("Empty set of inputs");
}
LOG(DEBUG) << "UnstagePackages() for " << Join(paths, ',');
for (const std::string& path : paths) {
auto apex = ApexFile::Open(path);
if (!apex.ok()) {
return apex.error();
}
if (ApexFileRepository::GetInstance().IsPreInstalledApex(*apex)) {
return Error() << "Can't uninstall pre-installed apex " << path;
}
}
for (const std::string& path : paths) {
if (unlink(path.c_str()) != 0) {
return ErrnoError() << "Can't unlink " << path;
}
}
return {};
}
/**
* During apex installation, staged sessions located in /data/apex/sessions
* mutate the active sessions in /data/apex/active. If some error occurs during
* installation of apex, we need to revert /data/apex/active to its original
* state and reboot.
*
* Also, we need to put staged sessions in /data/apex/sessions in REVERTED state
* so that they do not get activated on next reboot.
*/
Result<void> RevertActiveSessions(const std::string& crashing_native_process,
const std::string& error_message) {
// First check whenever there is anything to revert. If there is none, then
// fail. This prevents apexd from boot looping a device in case a native
// process is crashing and there are no apex updates.
auto active_sessions = ApexSession::GetActiveSessions();
if (active_sessions.empty()) {
return Error() << "Revert requested, when there are no active sessions.";
}
for (auto& session : active_sessions) {
if (!crashing_native_process.empty()) {
session.SetCrashingNativeProcess(crashing_native_process);
}
if (!error_message.empty()) {
session.SetErrorMessage(error_message);
}
auto status =
session.UpdateStateAndCommit(SessionState::REVERT_IN_PROGRESS);
if (!status.ok()) {
return Error() << "Revert of session " << session
<< " failed : " << status.error();
}
}
if (!gSupportsFsCheckpoints) {
auto restore_status = RestoreActivePackages();
if (!restore_status.ok()) {
for (auto& session : active_sessions) {
auto st = session.UpdateStateAndCommit(SessionState::REVERT_FAILED);
LOG(DEBUG) << "Marking " << session << " as failed to revert";
if (!st.ok()) {
LOG(WARNING) << "Failed to mark session " << session
<< " as failed to revert : " << st.error();
}
}
return restore_status;
}
} else {
LOG(INFO) << "Not restoring active packages in checkpoint mode.";
}
for (auto& session : active_sessions) {
if (!gSupportsFsCheckpoints && session.IsRollback()) {
// If snapshots have already been restored, undo that by restoring the
// pre-restore snapshot.
RestoreDePreRestoreSnapshotsIfPresent(session);
}
auto status = session.UpdateStateAndCommit(SessionState::REVERTED);
if (!status.ok()) {
LOG(WARNING) << "Failed to mark session " << session
<< " as reverted : " << status.error();
}
}
return {};
}
Result<void> RevertActiveSessionsAndReboot(
const std::string& crashing_native_process,
const std::string& error_message) {
auto status = RevertActiveSessions(crashing_native_process, error_message);
if (!status.ok()) {
return status;
}
LOG(ERROR) << "Successfully reverted. Time to reboot device.";
if (gInFsCheckpointMode) {
Result<void> res = gVoldService->AbortChanges(
"apexd_initiated" /* message */, false /* retry */);
if (!res.ok()) {
LOG(ERROR) << res.error();
}
}
Reboot();
return {};
}
Result<void> CreateSharedLibsApexDir() {
// Creates /apex/sharedlibs/lib{,64} for SharedLibs APEXes.
std::string shared_libs_sub_dir =
StringPrintf("%s/%s", kApexRoot, kApexSharedLibsSubDir);
auto dir_exists = PathExists(shared_libs_sub_dir);
if (!dir_exists.ok() || !*dir_exists) {
std::error_code error_code;
std::filesystem::create_directory(shared_libs_sub_dir, error_code);
if (error_code) {
return Error() << "Failed to create directory " << shared_libs_sub_dir
<< ": " << error_code.message();
}
}
for (const auto& lib_path : {"lib", "lib64"}) {
std::string apex_lib_path =
StringPrintf("%s/%s", shared_libs_sub_dir.c_str(), lib_path);
auto lib_dir_exists = PathExists(apex_lib_path);
if (!lib_dir_exists.ok() || !*lib_dir_exists) {
std::error_code error_code;
std::filesystem::create_directory(apex_lib_path, error_code);
if (error_code) {
return Error() << "Failed to create directory " << apex_lib_path << ": "
<< error_code.message();
}
}
}
return {};
}
int OnBootstrap() {
ATRACE_NAME("OnBootstrap");
auto time_started = boot_clock::now();
Result<void> pre_allocate = PreAllocateLoopDevices();
if (!pre_allocate.ok()) {
LOG(ERROR) << "Failed to pre-allocate loop devices : "
<< pre_allocate.error();
}
ApexFileRepository& instance = ApexFileRepository::GetInstance();
Result<void> status =
instance.AddPreInstalledApex(gConfig->apex_built_in_dirs);
if (!status.ok()) {
LOG(ERROR) << "Failed to collect APEX keys : " << status.error();
return 1;
}
// TODO(b/209491448) Remove this.
auto block_count = AddBlockApex(instance);
if (!block_count.ok()) {
LOG(ERROR) << status.error();
return 1;
}
pre_allocate = loop::PreAllocateLoopDevices(*block_count);
if (!pre_allocate.ok()) {
LOG(ERROR) << "Failed to pre-allocate loop devices for block apexes : "
<< pre_allocate.error();
}
DeviceMapper& dm = DeviceMapper::Instance();
// Create empty dm device for each found APEX.
// This is a boot time optimization that makes use of the fact that user space
// paths will be created by ueventd before apexd is started, and hence
// reducing the time to activate APEXEs on /data.
// Note: since at this point we don't know which APEXes are updated, we are
// optimistically creating a verity device for all of them. Once boot
// finishes, apexd will clean up unused devices.
// TODO(b/192241176): move to apexd_verity.{h,cpp}
for (const auto& apex : instance.GetPreInstalledApexFiles()) {
const std::string& name = apex.get().GetManifest().name();
if (!dm.CreateEmptyDevice(name)) {
LOG(ERROR) << "Failed to create empty device " << name;
}
}
// Create directories for APEX shared libraries.
auto sharedlibs_apex_dir = CreateSharedLibsApexDir();
if (!sharedlibs_apex_dir.ok()) {
LOG(ERROR) << sharedlibs_apex_dir.error();
return 1;
}
// Find all bootstrap apexes
std::vector<ApexFileRef> bootstrap_apexes;
for (const auto& apex : instance.GetPreInstalledApexFiles()) {
if (IsBootstrapApex(apex.get())) {
bootstrap_apexes.push_back(apex);
}
}
// Now activate bootstrap apexes.
auto ret =
ActivateApexPackages(bootstrap_apexes, ActivationMode::kBootstrapMode);
if (!ret.ok()) {
LOG(ERROR) << "Failed to activate bootstrap apex files : " << ret.error();
return 1;
}
OnAllPackagesActivated(/*is_bootstrap=*/true);
auto time_elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
boot_clock::now() - time_started).count();
LOG(INFO) << "OnBootstrap done, duration=" << time_elapsed;
return 0;
}
Result<void> RemountApexFile(const std::string& path) {
if (auto ret = DeactivatePackage(path); !ret.ok()) {
return ret;
}
return ActivatePackage(path);
}
void InitializeVold(CheckpointInterface* checkpoint_service) {
if (checkpoint_service != nullptr) {
gVoldService = checkpoint_service;
Result<bool> supports_fs_checkpoints =
gVoldService->SupportsFsCheckpoints();
if (supports_fs_checkpoints.ok()) {
gSupportsFsCheckpoints = *supports_fs_checkpoints;
} else {
LOG(ERROR) << "Failed to check if filesystem checkpoints are supported: "
<< supports_fs_checkpoints.error();
}
if (gSupportsFsCheckpoints) {
Result<bool> needs_checkpoint = gVoldService->NeedsCheckpoint();
if (needs_checkpoint.ok()) {
gInFsCheckpointMode = *needs_checkpoint;
} else {
LOG(ERROR) << "Failed to check if we're in filesystem checkpoint mode: "
<< needs_checkpoint.error();
}
}
}
}
void Initialize(CheckpointInterface* checkpoint_service) {
InitializeVold(checkpoint_service);
ApexFileRepository& instance = ApexFileRepository::GetInstance();
Result<void> status = instance.AddPreInstalledApex(kApexPackageBuiltinDirs);
if (!status.ok()) {
LOG(ERROR) << "Failed to collect pre-installed APEX files : "
<< status.error();
return;
}
// TODO(b/209491448) Remove this.
if (auto block_status = AddBlockApex(instance); !block_status.ok()) {
LOG(ERROR) << status.error();
return;
}
gMountedApexes.PopulateFromMounts(gConfig->active_apex_data_dir,
gConfig->decompression_dir,
gConfig->apex_hash_tree_dir);
}
// Note: Pre-installed apex are initialized in Initialize(CheckpointInterface*)
// TODO(b/172911822): Consolidate this with Initialize() when
// ApexFileRepository can act as cache and re-scanning is not expensive
void InitializeDataApex() {
ApexFileRepository& instance = ApexFileRepository::GetInstance();
Result<void> status = instance.AddDataApex(kActiveApexPackagesDataDir);
if (!status.ok()) {
LOG(ERROR) << "Failed to collect data APEX files : " << status.error();
return;
}
}
/**
* For every package X, there can be at most two APEX, pre-installed vs
* installed on data. We usually select only one of these APEX for each package
* based on the following conditions:
* - Package X must be pre-installed on one of the built-in directories.
* - If there are multiple APEX, we select the one with highest version.
* - If there are multiple with same version, we give priority to APEX on
* /data partition.
*
* Typically, only one APEX is activated for each package, but APEX that provide
* shared libs are exceptions. We have to activate both APEX for them.
*
* @param all_apex all the APEX grouped by their package name
* @return list of ApexFile that needs to be activated
*/
std::vector<ApexFileRef> SelectApexForActivation(
const std::unordered_map<std::string, std::vector<ApexFileRef>>& all_apex,
const ApexFileRepository& instance) {
LOG(INFO) << "Selecting APEX for activation";
std::vector<ApexFileRef> activation_list;
// For every package X, select which APEX to activate
for (auto& apex_it : all_apex) {
const std::string& package_name = apex_it.first;
const std::vector<ApexFileRef>& apex_files = apex_it.second;
if (apex_files.size() > 2 || apex_files.size() == 0) {
LOG(FATAL) << "Unexpectedly found more than two versions or none for "
"APEX package "
<< package_name;
continue;
}
// The package must have a pre-installed version before we consider it for
// activation
if (!instance.HasPreInstalledVersion(package_name)) {
LOG(INFO) << "Package " << package_name << " is not pre-installed";
continue;
}
if (apex_files.size() == 1) {
LOG(DEBUG) << "Selecting the only APEX: " << package_name << " "
<< apex_files[0].get().GetPath();
activation_list.emplace_back(apex_files[0]);
continue;
}
// TODO(b/179497746): Now that we are dealing with list of reference, this
// selection process can be simplified by sorting the vector.
// Given an APEX A and the version of the other APEX B, should we activate
// it?
auto select_apex = [&instance, &activation_list](
const ApexFileRef& a_ref,
const int version_b) mutable {
const ApexFile& a = a_ref.get();
// If A has higher version than B, then it should be activated
const bool higher_version = a.GetManifest().version() > version_b;
// If A has same version as B, then data version should get activated
const bool same_version_priority_to_data =
a.GetManifest().version() == version_b &&
!instance.IsPreInstalledApex(a);
// APEX that provides shared library are special:
// - if preinstalled version is lower than data version, both versions
// are activated.
// - if preinstalled version is equal to data version, data version only
// is activated.
// - if preinstalled version is higher than data version, preinstalled
// version only is activated.
const bool provides_shared_apex_libs =
a.GetManifest().providesharedapexlibs();
bool activate = false;
if (provides_shared_apex_libs) {
// preinstalled version gets activated in all cases except when same
// version as data.
if (instance.IsPreInstalledApex(a) &&
(a.GetManifest().version() != version_b)) {
LOG(DEBUG) << "Activating preinstalled shared libs APEX: "
<< a.GetManifest().name() << " " << a.GetPath();
activate = true;
}
// data version gets activated in all cases except when its version
// is lower than preinstalled version.
if (!instance.IsPreInstalledApex(a) &&
(a.GetManifest().version() >= version_b)) {
LOG(DEBUG) << "Activating shared libs APEX: "
<< a.GetManifest().name() << " " << a.GetPath();
activate = true;
}
} else if (higher_version || same_version_priority_to_data) {
LOG(DEBUG) << "Selecting between two APEX: " << a.GetManifest().name()
<< " " << a.GetPath();
activate = true;
}
if (activate) {
activation_list.emplace_back(a_ref);
}
};
const int version_0 = apex_files[0].get().GetManifest().version();
const int version_1 = apex_files[1].get().GetManifest().version();
select_apex(apex_files[0].get(), version_1);
select_apex(apex_files[1].get(), version_0);
}
return activation_list;
}
namespace {
Result<ApexFile> OpenAndValidateDecompressedApex(const ApexFile& capex,
const std::string& apex_path) {
auto apex = ApexFile::Open(apex_path);
if (!apex.ok()) {
return Error() << "Failed to open decompressed APEX: " << apex.error();
}
auto result = ValidateDecompressedApex(capex, *apex);
if (!result.ok()) {
return result.error();
}
auto ctx = GetfileconPath(apex_path);
if (!ctx.ok()) {
return ctx.error();
}
if (!StartsWith(*ctx, gConfig->active_apex_selinux_ctx)) {
return Error() << apex_path << " has wrong SELinux context " << *ctx;
}
return std::move(*apex);
}
// Process a single compressed APEX. Returns the decompressed APEX if
// successful.
Result<ApexFile> ProcessCompressedApex(const ApexFile& capex,
bool is_ota_chroot) {
LOG(INFO) << "Processing compressed APEX " << capex.GetPath();
const auto decompressed_apex_path =
StringPrintf("%s/%s%s", gConfig->decompression_dir,
GetPackageId(capex.GetManifest()).c_str(),
kDecompressedApexPackageSuffix);
// Check if decompressed APEX already exist
auto decompressed_path_exists = PathExists(decompressed_apex_path);
if (decompressed_path_exists.ok() && *decompressed_path_exists) {
// Check if existing decompressed APEX is valid
auto result =
OpenAndValidateDecompressedApex(capex, decompressed_apex_path);
if (result.ok()) {
LOG(INFO) << "Skipping decompression for " << capex.GetPath();
return result;
}
// Do not delete existing decompressed APEX when is_ota_chroot is true
if (!is_ota_chroot) {
// Existing decompressed APEX is not valid. We will have to redecompress
LOG(WARNING) << "Existing decompressed APEX is invalid: "
<< result.error();
RemoveFileIfExists(decompressed_apex_path);
}
}
// We can also reuse existing OTA APEX, depending on situation
auto ota_apex_path = StringPrintf("%s/%s%s", gConfig->decompression_dir,
GetPackageId(capex.GetManifest()).c_str(),
kOtaApexPackageSuffix);
auto ota_path_exists = PathExists(ota_apex_path);
if (ota_path_exists.ok() && *ota_path_exists) {
if (is_ota_chroot) {
// During ota_chroot, we try to reuse ota APEX as is
auto result = OpenAndValidateDecompressedApex(capex, ota_apex_path);
if (result.ok()) {
LOG(INFO) << "Skipping decompression for " << ota_apex_path;
return result;
}
// Existing ota_apex is not valid. We will have to decompress
LOG(WARNING) << "Existing decompressed OTA APEX is invalid: "
<< result.error();
RemoveFileIfExists(ota_apex_path);
} else {
// During boot, we can avoid decompression by renaming OTA apex
// to expected decompressed_apex path
// Check if ota_apex APEX is valid
auto result = OpenAndValidateDecompressedApex(capex, ota_apex_path);
if (result.ok()) {
// ota_apex matches with capex. Slot has been switched.
// Rename ota_apex to expected decompressed_apex path
if (rename(ota_apex_path.c_str(), decompressed_apex_path.c_str()) ==
0) {
// Check if renamed decompressed APEX is valid
result =
OpenAndValidateDecompressedApex(capex, decompressed_apex_path);
if (result.ok()) {
LOG(INFO) << "Renamed " << ota_apex_path << " to "
<< decompressed_apex_path;
return result;
}
// Renamed ota_apex is not valid. We will have to decompress
LOG(WARNING) << "Renamed decompressed APEX from " << ota_apex_path
<< " to " << decompressed_apex_path
<< " is invalid: " << result.error();
RemoveFileIfExists(decompressed_apex_path);
} else {
PLOG(ERROR) << "Failed to rename file " << ota_apex_path;
}
}
}
}
// There was no way to avoid decompression
// Clean up reserved space before decompressing capex
if (auto ret = DeleteDirContent(gConfig->ota_reserved_dir); !ret.ok()) {
LOG(ERROR) << "Failed to clean up reserved space: " << ret.error();
}
auto decompression_dest =
is_ota_chroot ? ota_apex_path : decompressed_apex_path;
auto scope_guard = android::base::make_scope_guard(
[&]() { RemoveFileIfExists(decompression_dest); });
auto decompression_result = capex.Decompress(decompression_dest);
if (!decompression_result.ok()) {
return Error() << "Failed to decompress : " << capex.GetPath().c_str()
<< " " << decompression_result.error();
}
// Fix label of decompressed file
auto restore = RestoreconPath(decompression_dest);
if (!restore.ok()) {
return restore.error();
}
// Validate the newly decompressed APEX
auto return_apex = OpenAndValidateDecompressedApex(capex, decompression_dest);
if (!return_apex.ok()) {
return Error() << "Failed to decompress CAPEX: " << return_apex.error();
}
gChangedActiveApexes.insert(return_apex->GetManifest().name());
/// Release compressed blocks in case decompression_dest is on f2fs-compressed
// filesystem.
ReleaseF2fsCompressedBlocks(decompression_dest);
scope_guard.Disable();
return return_apex;
}
} // namespace
/**
* For each compressed APEX, decompress it to kApexDecompressedDir
* and return the decompressed APEX.
*
* Returns list of decompressed APEX.
*/
std::vector<ApexFile> ProcessCompressedApex(
const std::vector<ApexFileRef>& compressed_apex, bool is_ota_chroot) {
LOG(INFO) << "Processing compressed APEX";
std::vector<ApexFile> decompressed_apex_list;
for (const ApexFile& capex : compressed_apex) {
if (!capex.IsCompressed()) {
continue;
}
auto decompressed_apex = ProcessCompressedApex(capex, is_ota_chroot);
if (decompressed_apex.ok()) {
decompressed_apex_list.emplace_back(std::move(*decompressed_apex));
continue;
}
LOG(ERROR) << "Failed to process compressed APEX: "
<< decompressed_apex.error();
}
return std::move(decompressed_apex_list);
}
Result<void> ValidateDecompressedApex(const ApexFile& capex,
const ApexFile& apex) {
// Decompressed APEX must have same public key as CAPEX
if (capex.GetBundledPublicKey() != apex.GetBundledPublicKey()) {
return Error()
<< "Public key of compressed APEX is different than original "
<< "APEX for " << apex.GetPath();
}
// Decompressed APEX must have same version as CAPEX
if (capex.GetManifest().version() != apex.GetManifest().version()) {
return Error()
<< "Compressed APEX has different version than decompressed APEX "
<< apex.GetPath();
}
// Decompressed APEX must have same root digest as what is stored in CAPEX
auto apex_verity = apex.VerifyApexVerity(apex.GetBundledPublicKey());
if (!apex_verity.ok() ||
capex.GetManifest().capexmetadata().originalapexdigest() !=
apex_verity->root_digest) {
return Error() << "Root digest of " << apex.GetPath()
<< " does not match with"
<< " expected root digest in " << capex.GetPath();
}
return {};
}
void OnStart() {
ATRACE_NAME("OnStart");
LOG(INFO) << "Marking APEXd as starting";
auto time_started = boot_clock::now();
if (!SetProperty(gConfig->apex_status_sysprop, kApexStatusStarting)) {
PLOG(ERROR) << "Failed to set " << gConfig->apex_status_sysprop << " to "
<< kApexStatusStarting;
}
// Ask whether we should revert any active sessions; this can happen if
// we've exceeded the retry count on a device that supports filesystem
// checkpointing.
if (gSupportsFsCheckpoints) {
Result<bool> needs_revert = gVoldService->NeedsRollback();
if (!needs_revert.ok()) {
LOG(ERROR) << "Failed to check if we need a revert: "
<< needs_revert.error();
} else if (*needs_revert) {
LOG(INFO) << "Exceeded number of session retries ("
<< kNumRetriesWhenCheckpointingEnabled
<< "). Starting a revert";
RevertActiveSessions("", "");
}
}
// Create directories for APEX shared libraries.
auto sharedlibs_apex_dir = CreateSharedLibsApexDir();
if (!sharedlibs_apex_dir.ok()) {
LOG(ERROR) << sharedlibs_apex_dir.error();
}
// If there is any new apex to be installed on /data/app-staging, hardlink
// them to /data/apex/active first.
ScanStagedSessionsDirAndStage();
if (auto status = ApexFileRepository::GetInstance().AddDataApex(
gConfig->active_apex_data_dir);
!status.ok()) {
LOG(ERROR) << "Failed to collect data APEX files : " << status.error();
}
auto status = ResumeRevertIfNeeded();
if (!status.ok()) {
LOG(ERROR) << "Failed to resume revert : " << status.error();
}
// Group every ApexFile on device by name
const auto& instance = ApexFileRepository::GetInstance();
const auto& all_apex = instance.AllApexFilesByName();
// There can be multiple APEX packages with package name X. Determine which
// one to activate.
// TODO(b/218672709): skip activation of sepolicy APEX during boot.
auto activation_list = SelectApexForActivation(all_apex, instance);
// Process compressed APEX, if any
std::vector<ApexFileRef> compressed_apex;
for (auto it = activation_list.begin(); it != activation_list.end();) {
if (it->get().IsCompressed()) {
compressed_apex.emplace_back(*it);
it = activation_list.erase(it);
} else {
it++;
}
}
std::vector<ApexFile> decompressed_apex;
if (!compressed_apex.empty()) {
decompressed_apex =
ProcessCompressedApex(compressed_apex, /* is_ota_chroot= */ false);
for (const ApexFile& apex_file : decompressed_apex) {
activation_list.emplace_back(std::cref(apex_file));
}
}
int data_apex_cnt = std::count_if(
activation_list.begin(), activation_list.end(), [](const auto& a) {
return !ApexFileRepository::GetInstance().IsPreInstalledApex(a.get());
});
if (data_apex_cnt > 0) {
Result<void> pre_allocate = loop::PreAllocateLoopDevices(data_apex_cnt);
if (!pre_allocate.ok()) {
LOG(ERROR) << "Failed to pre-allocate loop devices : "
<< pre_allocate.error();
}
}
// TODO(b/179248390): activate parallelly if possible
auto activate_status =
ActivateApexPackages(activation_list, ActivationMode::kBootMode);
if (!activate_status.ok()) {
std::string error_message =
StringPrintf("Failed to activate packages: %s",
activate_status.error().message().c_str());
LOG(ERROR) << error_message;
Result<void> revert_status =
RevertActiveSessionsAndReboot("", error_message);
if (!revert_status.ok()) {
LOG(ERROR) << "Failed to revert : " << revert_status.error();
}
auto retry_status =
ActivateMissingApexes(activation_list, ActivationMode::kBootMode);
if (!retry_status.ok()) {
LOG(ERROR) << retry_status.error();
}
}
// Now that APEXes are mounted, snapshot or restore DE_sys data.
SnapshotOrRestoreDeSysData();
auto time_elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
boot_clock::now() - time_started).count();
LOG(INFO) << "OnStart done, duration=" << time_elapsed;
}
void OnAllPackagesActivated(bool is_bootstrap) {
auto result = EmitApexInfoList(is_bootstrap);
if (!result.ok()) {
LOG(ERROR) << "cannot emit apex info list: " << result.error();
}
// Because apexd in bootstrap mode runs in blocking mode
// we don't have to set as activated.
if (is_bootstrap) {
return;
}
// Set a system property to let other components know that APEXs are
// activated, but are not yet ready to be used. init is expected to wait
// for this status before performing configuration based on activated
// apexes. Other components that need to use APEXs should wait for the
// ready state instead.
LOG(INFO) << "Marking APEXd as activated";
if (!SetProperty(gConfig->apex_status_sysprop, kApexStatusActivated)) {
PLOG(ERROR) << "Failed to set " << gConfig->apex_status_sysprop << " to "
<< kApexStatusActivated;
}
}
void OnAllPackagesReady() {
// Set a system property to let other components 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.
LOG(INFO) << "Marking APEXd as ready";
if (!SetProperty(gConfig->apex_status_sysprop, kApexStatusReady)) {
PLOG(ERROR) << "Failed to set " << gConfig->apex_status_sysprop << " to "
<< kApexStatusReady;
}
}
Result<std::vector<ApexFile>> SubmitStagedSession(
const int session_id, const std::vector<int>& child_session_ids,
const bool has_rollback_enabled, const bool is_rollback,
const int rollback_id) {
if (session_id == 0) {
return Error() << "Session id was not provided.";
}
if (!gSupportsFsCheckpoints) {
Result<void> backup_status = BackupActivePackages();
if (!backup_status.ok()) {
// Do not proceed with staged install without backup
return backup_status.error();
}
}
std::vector<int> ids_to_scan;
if (!child_session_ids.empty()) {
ids_to_scan = child_session_ids;
} else {
ids_to_scan = {session_id};
}
std::vector<ApexFile> ret;
auto guard = android::base::make_scope_guard([&]() {
for (const auto& apex : ret) {
apexd_private::UnmountTempMount(apex);
}
});
for (int id_to_scan : ids_to_scan) {
auto verified = VerifySessionDir(id_to_scan);
if (!verified.ok()) {
return verified.error();
}
LOG(DEBUG) << verified->GetPath() << " is verified";
ret.push_back(std::move(*verified));
}
if (has_rollback_enabled && is_rollback) {
return Error() << "Cannot set session " << session_id << " as both a"
<< " rollback and enabled for rollback.";
}
auto session = ApexSession::CreateSession(session_id);
if (!session.ok()) {
return session.error();
}
(*session).SetChildSessionIds(child_session_ids);
std::string build_fingerprint = GetProperty(kBuildFingerprintSysprop, "");
(*session).SetBuildFingerprint(build_fingerprint);
session->SetHasRollbackEnabled(has_rollback_enabled);
session->SetIsRollback(is_rollback);
session->SetRollbackId(rollback_id);
for (const auto& apex_file : ret) {
session->AddApexName(apex_file.GetManifest().name());
}
Result<void> commit_status =
(*session).UpdateStateAndCommit(SessionState::VERIFIED);
if (!commit_status.ok()) {
return commit_status.error();
}
for (const auto& apex : ret) {
// Release compressed blocks in case /data is f2fs-compressed filesystem.
ReleaseF2fsCompressedBlocks(apex.GetPath());
}
// The scope guard above uses lambda that captures ret by reference.
// Unfortunately, for the capture by-reference, lifetime of the captured
// reference ends together with the lifetime of the closure object. This means
// that we need to manually call UnmountTempMount here.
for (const auto& apex : ret) {
apexd_private::UnmountTempMount(apex);
}
return ret;
}
Result<void> MarkStagedSessionReady(const int session_id) {
auto session = ApexSession::GetSession(session_id);
if (!session.ok()) {
return session.error();
}
// We should only accept sessions in SessionState::VERIFIED or
// SessionState::STAGED state. In the SessionState::STAGED case, this
// function is effectively a no-op.
auto session_state = (*session).GetState();
if (session_state == SessionState::STAGED) {
return {};
}
if (session_state == SessionState::VERIFIED) {
return (*session).UpdateStateAndCommit(SessionState::STAGED);
}
return Error() << "Invalid state for session " << session_id
<< ". Cannot mark it as ready.";
}
Result<void> MarkStagedSessionSuccessful(const int session_id) {
auto session = ApexSession::GetSession(session_id);
if (!session.ok()) {
return session.error();
}
// Only SessionState::ACTIVATED or SessionState::SUCCESS states are accepted.
// In the SessionState::SUCCESS state, this function is a no-op.
if (session->GetState() == SessionState::SUCCESS) {
return {};
} else if (session->GetState() == SessionState::ACTIVATED) {
auto cleanup_status = DeleteBackup();
if (!cleanup_status.ok()) {
return Error() << "Failed to mark session " << *session
<< " as successful : " << cleanup_status.error();
}
if (session->IsRollback() && !gSupportsFsCheckpoints) {
DeleteDePreRestoreSnapshots(*session);
}
return session->UpdateStateAndCommit(SessionState::SUCCESS);
} else {
return Error() << "Session " << *session << " can not be marked successful";
}
}
// Removes APEXes on /data that have not been activated
void RemoveInactiveDataApex() {
std::vector<std::string> all_apex_files;
Result<std::vector<std::string>> active_apex =
FindFilesBySuffix(gConfig->active_apex_data_dir, {kApexPackageSuffix});
if (!active_apex.ok()) {
LOG(ERROR) << "Failed to scan " << gConfig->active_apex_data_dir << " : "
<< active_apex.error();
} else {
all_apex_files.insert(all_apex_files.end(),
std::make_move_iterator(active_apex->begin()),
std::make_move_iterator(active_apex->end()));
}
Result<std::vector<std::string>> decompressed_apex = FindFilesBySuffix(
gConfig->decompression_dir, {kDecompressedApexPackageSuffix});
if (!decompressed_apex.ok()) {
LOG(ERROR) << "Failed to scan " << gConfig->decompression_dir << " : "
<< decompressed_apex.error();
} else {
all_apex_files.insert(all_apex_files.end(),
std::make_move_iterator(decompressed_apex->begin()),
std::make_move_iterator(decompressed_apex->end()));
}
for (const auto& path : all_apex_files) {
if (!apexd_private::IsMounted(path)) {
LOG(INFO) << "Removing inactive data APEX " << path;
if (unlink(path.c_str()) != 0) {
PLOG(ERROR) << "Failed to unlink inactive data APEX " << path;
}
}
}
}
bool IsApexDevice(const std::string& dev_name) {
auto& repo = ApexFileRepository::GetInstance();
for (const auto& apex : repo.GetPreInstalledApexFiles()) {
if (StartsWith(dev_name, apex.get().GetManifest().name())) {
return true;
}
}
return false;
}
// TODO(b/192241176): move to apexd_verity.{h,cpp}.
void DeleteUnusedVerityDevices() {
DeviceMapper& dm = DeviceMapper::Instance();
std::vector<DeviceMapper::DmBlockDevice> all_devices;
if (!dm.GetAvailableDevices(&all_devices)) {
LOG(WARNING) << "Failed to fetch dm devices";
return;
}
for (const auto& dev : all_devices) {
auto state = dm.GetState(dev.name());
if (state == DmDeviceState::SUSPENDED && IsApexDevice(dev.name())) {
LOG(INFO) << "Deleting unused dm device " << dev.name();
auto res = DeleteVerityDevice(dev.name(), /* deferred= */ false);
if (!res.ok()) {
LOG(WARNING) << res.error();
}
}
}
}
void BootCompletedCleanup() {
RemoveInactiveDataApex();
ApexSession::DeleteFinalizedSessions();
DeleteUnusedVerityDevices();
}
int UnmountAll() {
gMountedApexes.PopulateFromMounts(gConfig->active_apex_data_dir,
gConfig->decompression_dir,
gConfig->apex_hash_tree_dir);
int ret = 0;
gMountedApexes.ForallMountedApexes([&](const std::string& /*package*/,
const MountedApexData& data,
bool latest) {
LOG(INFO) << "Unmounting " << data.full_path << " mounted on "
<< data.mount_point;
auto apex = ApexFile::Open(data.full_path);
if (!apex.ok()) {
LOG(ERROR) << "Failed to open " << data.full_path << " : "
<< apex.error();
ret = 1;
return;
}
if (latest && !apex->GetManifest().providesharedapexlibs()) {
auto pos = data.mount_point.find('@');
CHECK(pos != std::string::npos);
std::string bind_mount = data.mount_point.substr(0, pos);
if (umount2(bind_mount.c_str(), UMOUNT_NOFOLLOW) != 0) {
PLOG(ERROR) << "Failed to unmount bind-mount " << bind_mount;
ret = 1;
}
}
if (auto status = Unmount(data, /* deferred= */ false); !status.ok()) {
LOG(ERROR) << "Failed to unmount " << data.mount_point << " : "
<< status.error();
ret = 1;
}
});
return ret;
}
Result<void> RemountPackages() {
std::vector<std::string> apexes;
gMountedApexes.ForallMountedApexes([&apexes](const std::string& /*package*/,
const MountedApexData& data,
bool latest) {
if (latest) {
LOG(DEBUG) << "Found active APEX " << data.full_path;
apexes.push_back(data.full_path);
}
});
std::vector<std::string> failed;
for (const std::string& apex : apexes) {
// Since this is only used during development workflow, we are trying to
// remount as many apexes as possible instead of failing fast.
if (auto ret = RemountApexFile(apex); !ret.ok()) {
LOG(WARNING) << "Failed to remount " << apex << " : " << ret.error();
failed.emplace_back(apex);
}
}
static constexpr const char* kErrorMessage =
"Failed to remount following APEX packages, hence previous versions of "
"them are still active. If APEX you are developing is in this list, it "
"means that there still are alive processes holding a reference to the "
"previous version of your APEX.\n";
if (!failed.empty()) {
return Error() << kErrorMessage << "Failed (" << failed.size() << ") "
<< "APEX packages: [" << Join(failed, ',') << "]";
}
return {};
}
// Given a single new APEX incoming via OTA, should we allocate space for it?
bool ShouldAllocateSpaceForDecompression(const std::string& new_apex_name,
const int64_t new_apex_version,
const ApexFileRepository& instance) {
// An apex at most will have two versions on device: pre-installed and data.
// Check if there is a pre-installed version for the new apex.
if (!instance.HasPreInstalledVersion(new_apex_name)) {
// We are introducing a new APEX that doesn't exist at all
return true;
}
// Check if there is a data apex
if (!instance.HasDataVersion(new_apex_name)) {
// Data apex doesn't exist. Compare against pre-installed APEX
auto pre_installed_apex = instance.GetPreInstalledApex(new_apex_name);
if (!pre_installed_apex.get().IsCompressed()) {
// Compressing an existing uncompressed system APEX.
return true;
}
// Since there is no data apex, it means device is using the compressed
// pre-installed version. If new apex has higher version, we are upgrading
// the pre-install version and if new apex has lower version, we are
// downgrading it. So the current decompressed apex should be replaced
// with the new decompressed apex to reflect that.
const int64_t pre_installed_version =
instance.GetPreInstalledApex(new_apex_name)
.get()
.GetManifest()
.version();
return new_apex_version != pre_installed_version;
}
// From here on, data apex exists. So we should compare directly against data
// apex.
auto data_apex = instance.GetDataApex(new_apex_name);
// Compare the data apex version with new apex
const int64_t data_version = data_apex.get().GetManifest().version();
// We only decompress the new_apex if it has higher version than data apex.
return new_apex_version > data_version;
}
int64_t CalculateSizeForCompressedApex(
const std::vector<std::tuple<std::string, int64_t, int64_t>>&
compressed_apexes,
const ApexFileRepository& instance) {
int64_t result = 0;
for (const auto& compressed_apex : compressed_apexes) {
std::string module_name;
int64_t version_code;
int64_t decompressed_size;
std::tie(module_name, version_code, decompressed_size) = compressed_apex;
if (ShouldAllocateSpaceForDecompression(module_name, version_code,
instance)) {
result += decompressed_size;
}
}
return result;
}
void CollectApexInfoList(std::ostream& os,
const std::vector<ApexFile>& active_apexs,
const std::vector<ApexFile>& inactive_apexs) {
std::vector<com::android::apex::ApexInfo> apex_infos;
auto convert_to_autogen = [&apex_infos](const ApexFile& apex,
bool is_active) {
auto& instance = ApexFileRepository::GetInstance();
auto preinstalled_path =
instance.GetPreinstalledPath(apex.GetManifest().name());
std::optional<std::string> preinstalled_module_path;
if (preinstalled_path.ok()) {
preinstalled_module_path = *preinstalled_path;
}
std::optional<int64_t> mtime =
instance.GetBlockApexLastUpdateSeconds(apex.GetManifest().name());
if (!mtime.has_value()) {
struct stat stat_buf;
if (stat(apex.GetPath().c_str(), &stat_buf) == 0) {
mtime.emplace(stat_buf.st_mtime);
} else {
PLOG(WARNING) << "Failed to stat " << apex.GetPath();
}
}
com::android::apex::ApexInfo apex_info(
apex.GetManifest().name(), apex.GetPath(), preinstalled_module_path,
apex.GetManifest().version(), apex.GetManifest().versionname(),
instance.IsPreInstalledApex(apex), is_active, mtime,
apex.GetManifest().providesharedapexlibs());
apex_infos.emplace_back(std::move(apex_info));
};
for (const auto& apex : active_apexs) {
convert_to_autogen(apex, /* is_active= */ true);
}
for (const auto& apex : inactive_apexs) {
convert_to_autogen(apex, /* is_active= */ false);
}
com::android::apex::ApexInfoList apex_info_list(apex_infos);
com::android::apex::write(os, apex_info_list);
}
// Reserve |size| bytes in |dest_dir| by creating a zero-filled file.
// Also, we always clean up ota_apex that has been processed as
// part of pre-reboot decompression whenever we reserve space.
Result<void> ReserveSpaceForCompressedApex(int64_t size,
const std::string& dest_dir) {
if (size < 0) {
return Error() << "Cannot reserve negative byte of space";
}
// Since we are reserving space, then we must be preparing for a new OTA.
// Clean up any processed ota_apex from previous OTA.
auto ota_apex_files =
FindFilesBySuffix(gConfig->decompression_dir, {kOtaApexPackageSuffix});
if (!ota_apex_files.ok()) {
return Error() << "Failed to clean up ota_apex: " << ota_apex_files.error();
}
for (const std::string& ota_apex : *ota_apex_files) {
RemoveFileIfExists(ota_apex);
}
auto file_path = StringPrintf("%s/full.tmp", dest_dir.c_str());
if (size == 0) {
LOG(INFO) << "Cleaning up reserved space for compressed APEX";
// Ota is being cancelled. Clean up reserved space
RemoveFileIfExists(file_path);
return {};
}
LOG(INFO) << "Reserving " << size << " bytes for compressed APEX";
unique_fd dest_fd(
open(file_path.c_str(), O_WRONLY | O_CLOEXEC | O_CREAT, 0644));
if (dest_fd.get() == -1) {
return ErrnoError() << "Failed to open file for reservation "
<< file_path.c_str();
}
// Resize to required size
std::error_code ec;
std::filesystem::resize_file(file_path, size, ec);
if (ec) {
RemoveFileIfExists(file_path);
return ErrnoError() << "Failed to resize file " << file_path.c_str()
<< " : " << ec.message();
}
return {};
}
// Adds block apexes if system property is set.
Result<int> AddBlockApex(ApexFileRepository& instance) {
auto prop = GetProperty(gConfig->vm_payload_metadata_partition_prop, "");
if (prop != "") {
auto block_count = instance.AddBlockApex(prop);
if (!block_count.ok()) {
return Error() << "Failed to scan block APEX files: "
<< block_count.error();
}
return block_count;
} else {
LOG(INFO) << "No block apex metadata partition found, not adding block "
<< "apexes";
}
return 0;
}
// When running in the VM mode, we follow the minimal start-up operations.
// - CreateSharedLibsApexDir
// - AddPreInstalledApex: note that CAPEXes are not supported in the VM mode
// - AddBlockApex
// - ActivateApexPackages
// - setprop apexd.status: activated/ready
int OnStartInVmMode() {
// waits for /dev/loop-control
loop::PreAllocateLoopDevices(0);
// Create directories for APEX shared libraries.
if (auto status = CreateSharedLibsApexDir(); !status.ok()) {
LOG(ERROR) << "Failed to create /apex/sharedlibs : " << status.ok();
return 1;
}
auto& instance = ApexFileRepository::GetInstance();
// Scan pre-installed apexes
if (auto status = instance.AddPreInstalledApex(gConfig->apex_built_in_dirs);
!status.ok()) {
LOG(ERROR) << "Failed to scan pre-installed APEX files: " << status.error();
return 1;
}
if (auto status = AddBlockApex(instance); !status.ok()) {
LOG(ERROR) << status.error();
return 1;
}
if (auto status = ActivateApexPackages(instance.GetPreInstalledApexFiles(),
ActivationMode::kVmMode);
!status.ok()) {
LOG(ERROR) << "Failed to activate apex packages : " << status.error();
return 1;
}
if (auto status = ActivateApexPackages(instance.GetDataApexFiles(),
ActivationMode::kVmMode);
!status.ok()) {
LOG(ERROR) << "Failed to activate apex packages : " << status.error();
return 1;
}
OnAllPackagesActivated(false);
// In VM mode, we don't run a separate --snapshotde mode.
// Instead, we mark apexd.status "ready" right now.
OnAllPackagesReady();
return 0;
}
int OnOtaChrootBootstrap() {
auto& instance = ApexFileRepository::GetInstance();
if (auto status = instance.AddPreInstalledApex(gConfig->apex_built_in_dirs);
!status.ok()) {
LOG(ERROR) << "Failed to scan pre-installed apexes from "
<< Join(gConfig->apex_built_in_dirs, ',');
return 1;
}
if (auto status = instance.AddDataApex(gConfig->active_apex_data_dir);
!status.ok()) {
LOG(ERROR) << "Failed to scan upgraded apexes from "
<< gConfig->active_apex_data_dir;
// Failing to scan upgraded apexes is not fatal, since we can still try to
// run otapreopt using only pre-installed apexes. Worst case, apps will be
// re-optimized on next boot.
}
// Create directories for APEX shared libraries.
if (auto status = CreateSharedLibsApexDir(); !status.ok()) {
LOG(ERROR) << "Failed to create /apex/sharedlibs : " << status.ok();
return 1;
}
auto activation_list =
SelectApexForActivation(instance.AllApexFilesByName(), instance);
// TODO(b/179497746): This is the third time we are duplicating this code
// block. This will be easier to dedup once we start opening ApexFiles via
// ApexFileRepository. That way, ProcessCompressedApex can return list of
// ApexFileRef, instead of ApexFile.
// Process compressed APEX, if any
std::vector<ApexFileRef> compressed_apex;
for (auto it = activation_list.begin(); it != activation_list.end();) {
if (it->get().IsCompressed()) {
compressed_apex.emplace_back(*it);
it = activation_list.erase(it);
} else {
it++;
}
}
std::vector<ApexFile> decompressed_apex;
if (!compressed_apex.empty()) {
decompressed_apex =
ProcessCompressedApex(compressed_apex, /* is_ota_chroot= */ true);
for (const ApexFile& apex_file : decompressed_apex) {
activation_list.emplace_back(std::cref(apex_file));
}
}
auto activate_status =
ActivateApexPackages(activation_list, ActivationMode::kOtaChrootMode);
if (!activate_status.ok()) {
LOG(ERROR) << "Failed to activate apex packages : "
<< activate_status.error();
auto retry_status =
ActivateMissingApexes(activation_list, ActivationMode::kOtaChrootMode);
if (!retry_status.ok()) {
LOG(ERROR) << retry_status.error();
}
}
// There are a bunch of places that are producing apex-info.xml file.
// We should consolidate the logic in one function and make all other places
// use it.
auto active_apexes = GetActivePackages();
std::vector<ApexFile> inactive_apexes = GetFactoryPackages();
auto new_end = std::remove_if(
inactive_apexes.begin(), inactive_apexes.end(),
[&active_apexes](const ApexFile& apex) {
return std::any_of(active_apexes.begin(), active_apexes.end(),
[&apex](const ApexFile& active_apex) {
return apex.GetPath() == active_apex.GetPath();
});
});
inactive_apexes.erase(new_end, inactive_apexes.end());
std::stringstream xml;
CollectApexInfoList(xml, active_apexes, inactive_apexes);
std::string file_name = StringPrintf("%s/%s", kApexRoot, kApexInfoList);
unique_fd fd(TEMP_FAILURE_RETRY(
open(file_name.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0644)));
if (fd.get() == -1) {
PLOG(ERROR) << "Can't open " << file_name;
return 1;
}
if (!android::base::WriteStringToFd(xml.str(), fd)) {
PLOG(ERROR) << "Can't write to " << file_name;
return 1;
}
fd.reset();
if (auto status = RestoreconPath(file_name); !status.ok()) {
LOG(ERROR) << "Failed to restorecon " << file_name << " : "
<< status.error();
return 1;
}
return 0;
}
int ActivateFlattenedApex() {
LOG(INFO) << "ActivateFlattenedApex";
std::vector<com::android::apex::ApexInfo> apex_infos;
for (const std::string& dir : gConfig->apex_built_in_dirs) {
LOG(INFO) << "Scanning " << dir;
auto dir_content = ReadDir(dir, [](const auto& entry) {
std::error_code ec;
return entry.is_directory(ec);
});
if (!dir_content.ok()) {
LOG(ERROR) << "Failed to scan " << dir << " : " << dir_content.error();
continue;
}
// Sort to make sure that /apex/apex-info-list.xml generation doesn't depend
// on the unstable directory scan.
std::vector<std::string> entries = std::move(*dir_content);
std::sort(entries.begin(), entries.end());
for (const std::string& apex_dir : entries) {
std::string manifest_file = apex_dir + "/" + kManifestFilenamePb;
if (access(manifest_file.c_str(), F_OK) != 0) {
PLOG(ERROR) << "Failed to access " << manifest_file;
continue;
}
auto manifest = ReadManifest(manifest_file);
if (!manifest.ok()) {
LOG(ERROR) << "Failed to read apex manifest from " << manifest_file
<< " : " << manifest.error();
continue;
}
std::string mount_point = std::string(kApexRoot) + "/" + manifest->name();
if (mkdir(mount_point.c_str(), 0755) != 0) {
PLOG(ERROR) << "Failed to mkdir " << mount_point;
continue;
}
LOG(INFO) << "Bind mounting " << apex_dir << " onto " << mount_point;
if (mount(apex_dir.c_str(), mount_point.c_str(), nullptr, MS_BIND,
nullptr) != 0) {
PLOG(ERROR) << "Failed to bind mount " << apex_dir << " to "
<< mount_point;
continue;
}
apex_infos.emplace_back(manifest->name(), /* modulePath= */ apex_dir,
/* preinstalledModulePath= */ apex_dir,
/* versionCode= */ manifest->version(),
/* versionName= */ manifest->versionname(),
/* isFactory= */ true, /* isActive= */ true,
/* lastUpdateMillis= */ 0,
/* provideSharedApexLibs= */ false);
}
}
std::string file_name = StringPrintf("%s/%s", kApexRoot, kApexInfoList);
unique_fd fd(TEMP_FAILURE_RETRY(
open(file_name.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0644)));
if (fd.get() == -1) {
PLOG(ERROR) << "Can't open " << file_name;
return 1;
}
std::ostringstream xml;
com::android::apex::ApexInfoList apex_info_list(apex_infos);
com::android::apex::write(xml, apex_info_list);
if (!android::base::WriteStringToFd(xml.str(), fd)) {
PLOG(ERROR) << "Can't write to " << file_name;
return 1;
}
fd.reset();
if (auto status = RestoreconPath(file_name); !status.ok()) {
LOG(ERROR) << "Failed to restorecon " << file_name << " : "
<< status.error();
return 1;
}
return 0;
}
android::apex::MountedApexDatabase& GetApexDatabaseForTesting() {
return gMountedApexes;
}
// A version of apex verification that happens during non-staged APEX
// installation.
Result<void> VerifyPackageNonStagedInstall(const ApexFile& apex_file) {
const auto& verify_package_boot_status = VerifyPackageBoot(apex_file);
if (!verify_package_boot_status.ok()) {
return verify_package_boot_status;
}
auto check_fn = [&apex_file](const std::string& mount_point) -> Result<void> {
auto dirs = GetSubdirs(mount_point);
if (!dirs.ok()) {
return dirs.error();
}
if (std::find(dirs->begin(), dirs->end(), mount_point + "/app") !=
dirs->end()) {
return Error() << apex_file.GetPath() << " contains app inside";
}
if (std::find(dirs->begin(), dirs->end(), mount_point + "/priv-app") !=
dirs->end()) {
return Error() << apex_file.GetPath() << " contains priv-app inside";
}
return Result<void>{};
};
return RunVerifyFnInsideTempMount(apex_file, check_fn, true);
}
Result<void> CheckSupportsNonStagedInstall(const ApexFile& cur_apex,
const ApexFile& new_apex) {
const auto& cur_manifest = cur_apex.GetManifest();
const auto& new_manifest = new_apex.GetManifest();
if (!new_manifest.supportsrebootlessupdate()) {
return Error() << new_apex.GetPath()
<< " does not support non-staged update";
}
// Check if update will impact linkerconfig.
// Updates to shared libs APEXes must be done via staged install flow.
if (new_manifest.providesharedapexlibs()) {
return Error() << new_apex.GetPath() << " is a shared libs APEX";
}
// This APEX provides native libs to other parts of the platform. It can only
// be updated via staged install flow.
if (new_manifest.providenativelibs_size() > 0) {
return Error() << new_apex.GetPath() << " provides native libs";
}
// This APEX requires libs provided by dynamic common library APEX, hence it
// can only be installed using staged install flow.
if (new_manifest.requiresharedapexlibs_size() > 0) {
return Error() << new_apex.GetPath() << " requires shared apex libs";
}
// We don't allow non-staged updates of APEXES that have java libs inside.
if (new_manifest.jnilibs_size() > 0) {
return Error() << new_apex.GetPath() << " requires JNI libs";
}
// For requireNativeLibs bit, we only allow updates that don't change list of
// required libs.
std::vector<std::string> cur_required_libs(
cur_manifest.requirenativelibs().begin(),
cur_manifest.requirenativelibs().end());
sort(cur_required_libs.begin(), cur_required_libs.end());
std::vector<std::string> new_required_libs(
new_manifest.requirenativelibs().begin(),
new_manifest.requirenativelibs().end());
sort(new_required_libs.begin(), new_required_libs.end());
if (cur_required_libs != new_required_libs) {
return Error() << "Set of native libs required by " << new_apex.GetPath()
<< " differs from the one required by the currently active "
<< cur_apex.GetPath();
}
auto expected_public_key =
ApexFileRepository::GetInstance().GetPublicKey(new_manifest.name());
if (!expected_public_key.ok()) {
return expected_public_key.error();
}
auto verity_data = new_apex.VerifyApexVerity(*expected_public_key);
if (!verity_data.ok()) {
return verity_data.error();
}
// Supporting non-staged install of APEXes without a hashtree is additional
// hassle, it's easier not to support it.
if (verity_data->desc->tree_size == 0) {
return Error() << new_apex.GetPath()
<< " does not have an embedded hash tree";
}
return {};
}
Result<size_t> ComputePackageIdMinor(const ApexFile& apex) {
static constexpr size_t kMaxVerityDevicesPerApexName = 3u;
DeviceMapper& dm = DeviceMapper::Instance();
std::vector<DeviceMapper::DmBlockDevice> dm_devices;
if (!dm.GetAvailableDevices(&dm_devices)) {
return Error() << "Failed to list dm devices";
}
size_t devices = 0;
size_t next_minor = 1;
for (const auto& dm_device : dm_devices) {
std::string_view dm_name(dm_device.name());
// Format is <module_name>@<version_code>[_<minor>]
if (!ConsumePrefix(&dm_name, apex.GetManifest().name())) {
continue;
}
devices++;
auto pos = dm_name.find_last_of('_');
if (pos == std::string_view::npos) {
continue;
}
size_t minor;
if (!ParseUint(std::string(dm_name.substr(pos + 1)), &minor)) {
return Error() << "Unexpected dm device name " << dm_device.name();
}
if (next_minor < minor + 1) {
next_minor = minor + 1;
}
}
if (devices > kMaxVerityDevicesPerApexName) {
return Error() << "There are too many (" << devices
<< ") dm block devices associated with package "
<< apex.GetManifest().name();
}
while (true) {
std::string target_file =
StringPrintf("%s/%s_%zu.apex", gConfig->active_apex_data_dir,
GetPackageId(apex.GetManifest()).c_str(), next_minor);
if (access(target_file.c_str(), F_OK) == 0) {
next_minor++;
} else {
break;
}
}
return next_minor;
}
Result<void> UpdateApexInfoList() {
std::vector<ApexFile> active(GetActivePackages());
std::vector<ApexFile> inactive = CalculateInactivePackages(active);
std::stringstream xml;
CollectApexInfoList(xml, active, inactive);
std::string name = StringPrintf("%s/.default-%s", kApexRoot, kApexInfoList);
unique_fd fd(TEMP_FAILURE_RETRY(
open(name.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0644)));
if (fd.get() == -1) {
return ErrnoError() << "Can't open " << name;
}
if (!WriteStringToFd(xml.str(), fd)) {
return ErrnoError() << "Failed to write to " << name;
}
return {};
}
Result<ApexFile> InstallPackage(const std::string& package_path) {
LOG(INFO) << "Installing " << package_path;
auto temp_apex = ApexFile::Open(package_path);
if (!temp_apex.ok()) {
return temp_apex.error();
}
const std::string& module_name = temp_apex->GetManifest().name();
// Don't allow non-staged update if there are no active versions of this APEX.
auto cur_mounted_data = gMountedApexes.GetLatestMountedApex(module_name);
if (!cur_mounted_data.has_value()) {
return Error() << "No active version found for package " << module_name;
}
auto cur_apex = ApexFile::Open(cur_mounted_data->full_path);
if (!cur_apex.ok()) {
return cur_apex.error();
}
// Do a quick check if this APEX can be installed without a reboot.
// Note that passing this check doesn't guarantee that APEX will be
// successfully installed.
if (auto r = CheckSupportsNonStagedInstall(*cur_apex, *temp_apex); !r.ok()) {
return r.error();
}
// 1. Verify that APEX is correct. This is a heavy check that involves
// mounting an APEX on a temporary mount point and reading the entire
// dm-verity block device.
if (auto verify = VerifyPackageNonStagedInstall(*temp_apex); !verify.ok()) {
return verify.error();
}
// 2. Compute params for mounting new apex.
auto new_id_minor = ComputePackageIdMinor(*temp_apex);
if (!new_id_minor.ok()) {
return new_id_minor.error();
}
std::string new_id = GetPackageId(temp_apex->GetManifest()) + "_" +
std::to_string(*new_id_minor);
// 2. Unmount currently active APEX.
if (auto res = UnmountPackage(*cur_apex, /* allow_latest= */ true,
/* deferred= */ true);
!res.ok()) {
return res.error();
}
// 3. Hard link to final destination.
std::string target_file =
StringPrintf("%s/%s.apex", gConfig->active_apex_data_dir, new_id.c_str());
auto guard = android::base::make_scope_guard([&]() {
if (unlink(target_file.c_str()) != 0 && errno != ENOENT) {
PLOG(ERROR) << "Failed to unlink " << target_file;
}
// We can't really rely on the fact that dm-verity device backing up
// previously active APEX is still around. We need to create a new one.
std::string old_new_id = GetPackageId(temp_apex->GetManifest()) + "_" +
std::to_string(*new_id_minor + 1);
auto res = ActivatePackageImpl(*cur_apex, old_new_id,
/* reuse_device= */ false);
if (!res.ok()) {
// At this point not much we can do... :(
LOG(ERROR) << res.error();
}
});
// At this point it should be safe to hard link |temp_apex| to
// |params->target_file|. In case reboot happens during one of the stages
// below, then on next boot apexd will pick up the new verified APEX.
if (link(package_path.c_str(), target_file.c_str()) != 0) {
return ErrnoError() << "Failed to link " << package_path << " to "
<< target_file;
}
auto new_apex = ApexFile::Open(target_file);
if (!new_apex.ok()) {
return new_apex.error();
}
// 4. And activate new one.
auto activate_status = ActivatePackageImpl(*new_apex, new_id,
/* reuse_device= */ false);
if (!activate_status.ok()) {
return activate_status.error();
}
// Accept the install.
guard.Disable();
// 4. Now we can unlink old APEX if it's not pre-installed.
if (!ApexFileRepository::GetInstance().IsPreInstalledApex(*cur_apex)) {
if (unlink(cur_mounted_data->full_path.c_str()) != 0) {
PLOG(ERROR) << "Failed to unlink " << cur_mounted_data->full_path;
}
}
if (auto res = UpdateApexInfoList(); !res.ok()) {
LOG(ERROR) << res.error();
}
// Release compressed blocks in case target_file is on f2fs-compressed
// filesystem.
ReleaseF2fsCompressedBlocks(target_file);
return new_apex;
}
bool IsActiveApexChanged(const ApexFile& apex) {
return gChangedActiveApexes.find(apex.GetManifest().name()) !=
gChangedActiveApexes.end();
}
std::set<std::string>& GetChangedActiveApexesForTesting() {
return gChangedActiveApexes;
}
} // namespace apex
} // namespace android