| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "reboot.h" |
| |
| #include <dirent.h> |
| #include <fcntl.h> |
| #include <linux/fs.h> |
| #include <linux/loop.h> |
| #include <mntent.h> |
| #include <semaphore.h> |
| #include <stdlib.h> |
| #include <sys/cdefs.h> |
| #include <sys/ioctl.h> |
| #include <sys/mount.h> |
| #include <sys/stat.h> |
| #include <sys/swap.h> |
| #include <sys/syscall.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| |
| #include <chrono> |
| #include <memory> |
| #include <set> |
| #include <thread> |
| #include <vector> |
| |
| #include <InitProperties.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/properties.h> |
| #include <android-base/scopeguard.h> |
| #include <android-base/strings.h> |
| #include <android-base/unique_fd.h> |
| #include <bootloader_message/bootloader_message.h> |
| #include <cutils/android_reboot.h> |
| #include <fs_mgr.h> |
| #include <logwrap/logwrap.h> |
| #include <private/android_filesystem_config.h> |
| #include <selinux/selinux.h> |
| |
| #include "action.h" |
| #include "action_manager.h" |
| #include "builtin_arguments.h" |
| #include "init.h" |
| #include "mount_namespace.h" |
| #include "property_service.h" |
| #include "reboot_utils.h" |
| #include "service.h" |
| #include "service_list.h" |
| #include "sigchld_handler.h" |
| #include "util.h" |
| |
| using namespace std::literals; |
| |
| using android::base::boot_clock; |
| using android::base::GetBoolProperty; |
| using android::base::GetUintProperty; |
| using android::base::SetProperty; |
| using android::base::Split; |
| using android::base::Timer; |
| using android::base::unique_fd; |
| using android::base::WaitForProperty; |
| using android::base::WriteStringToFile; |
| |
| namespace android { |
| namespace init { |
| |
| static bool shutting_down = false; |
| |
| static const std::set<std::string> kDebuggingServices{"tombstoned", "logd", "adbd", "console"}; |
| |
| static std::vector<Service*> GetDebuggingServices(bool only_post_data) { |
| std::vector<Service*> ret; |
| ret.reserve(kDebuggingServices.size()); |
| for (const auto& s : ServiceList::GetInstance()) { |
| if (kDebuggingServices.count(s->name()) && (!only_post_data || s->is_post_data())) { |
| ret.push_back(s.get()); |
| } |
| } |
| return ret; |
| } |
| |
| static void PersistRebootReason(const char* reason, bool write_to_property) { |
| if (write_to_property) { |
| SetProperty(LAST_REBOOT_REASON_PROPERTY, reason); |
| } |
| auto fd = unique_fd(TEMP_FAILURE_RETRY(open( |
| LAST_REBOOT_REASON_FILE, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC | O_BINARY, 0666))); |
| if (!fd.ok()) { |
| PLOG(ERROR) << "Could not open '" << LAST_REBOOT_REASON_FILE |
| << "' to persist reboot reason"; |
| return; |
| } |
| WriteStringToFd(reason, fd); |
| fsync(fd.get()); |
| } |
| |
| // represents umount status during reboot / shutdown. |
| enum UmountStat { |
| /* umount succeeded. */ |
| UMOUNT_STAT_SUCCESS = 0, |
| /* umount was not run. */ |
| UMOUNT_STAT_SKIPPED = 1, |
| /* umount failed with timeout. */ |
| UMOUNT_STAT_TIMEOUT = 2, |
| /* could not run due to error */ |
| UMOUNT_STAT_ERROR = 3, |
| /* not used by init but reserved for other part to use this to represent the |
| the state where umount status before reboot is not found / available. */ |
| UMOUNT_STAT_NOT_AVAILABLE = 4, |
| }; |
| |
| // Utility for struct mntent |
| class MountEntry { |
| public: |
| explicit MountEntry(const mntent& entry) |
| : mnt_fsname_(entry.mnt_fsname), |
| mnt_dir_(entry.mnt_dir), |
| mnt_type_(entry.mnt_type), |
| mnt_opts_(entry.mnt_opts) {} |
| |
| bool Umount(bool force) { |
| LOG(INFO) << "Unmounting " << mnt_fsname_ << ":" << mnt_dir_ << " opts " << mnt_opts_; |
| int r = umount2(mnt_dir_.c_str(), force ? MNT_FORCE : 0); |
| if (r == 0) { |
| LOG(INFO) << "Umounted " << mnt_fsname_ << ":" << mnt_dir_ << " opts " << mnt_opts_; |
| return true; |
| } else { |
| PLOG(WARNING) << "Cannot umount " << mnt_fsname_ << ":" << mnt_dir_ << " opts " |
| << mnt_opts_; |
| return false; |
| } |
| } |
| |
| void DoFsck() { |
| int st; |
| if (IsF2Fs()) { |
| const char* f2fs_argv[] = { |
| "/system/bin/fsck.f2fs", |
| "-a", |
| mnt_fsname_.c_str(), |
| }; |
| logwrap_fork_execvp(arraysize(f2fs_argv), f2fs_argv, &st, false, LOG_KLOG, true, |
| nullptr); |
| } else if (IsExt4()) { |
| const char* ext4_argv[] = { |
| "/system/bin/e2fsck", |
| "-y", |
| mnt_fsname_.c_str(), |
| }; |
| logwrap_fork_execvp(arraysize(ext4_argv), ext4_argv, &st, false, LOG_KLOG, true, |
| nullptr); |
| } |
| } |
| |
| static bool IsBlockDevice(const struct mntent& mntent) { |
| return android::base::StartsWith(mntent.mnt_fsname, "/dev/block"); |
| } |
| |
| static bool IsEmulatedDevice(const struct mntent& mntent) { |
| return android::base::StartsWith(mntent.mnt_fsname, "/data/"); |
| } |
| |
| private: |
| bool IsF2Fs() const { return mnt_type_ == "f2fs"; } |
| |
| bool IsExt4() const { return mnt_type_ == "ext4"; } |
| |
| std::string mnt_fsname_; |
| std::string mnt_dir_; |
| std::string mnt_type_; |
| std::string mnt_opts_; |
| }; |
| |
| // Turn off backlight while we are performing power down cleanup activities. |
| static void TurnOffBacklight() { |
| Service* service = ServiceList::GetInstance().FindService("blank_screen"); |
| if (service == nullptr) { |
| LOG(WARNING) << "cannot find blank_screen in TurnOffBacklight"; |
| return; |
| } |
| if (auto result = service->Start(); !result.ok()) { |
| LOG(WARNING) << "Could not start blank_screen service: " << result.error(); |
| } |
| } |
| |
| static Result<void> CallVdc(const std::string& system, const std::string& cmd) { |
| LOG(INFO) << "Calling /system/bin/vdc " << system << " " << cmd; |
| const char* vdc_argv[] = {"/system/bin/vdc", system.c_str(), cmd.c_str()}; |
| int status; |
| if (logwrap_fork_execvp(arraysize(vdc_argv), vdc_argv, &status, false, LOG_KLOG, true, |
| nullptr) != 0) { |
| return ErrnoError() << "Failed to call '/system/bin/vdc " << system << " " << cmd << "'"; |
| } |
| if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { |
| return {}; |
| } |
| return Error() << "'/system/bin/vdc " << system << " " << cmd << "' failed : " << status; |
| } |
| |
| static void LogShutdownTime(UmountStat stat, Timer* t) { |
| LOG(WARNING) << "powerctl_shutdown_time_ms:" << std::to_string(t->duration().count()) << ":" |
| << stat; |
| } |
| |
| static bool IsDataMounted() { |
| std::unique_ptr<std::FILE, int (*)(std::FILE*)> fp(setmntent("/proc/mounts", "re"), endmntent); |
| if (fp == nullptr) { |
| PLOG(ERROR) << "Failed to open /proc/mounts"; |
| return false; |
| } |
| mntent* mentry; |
| while ((mentry = getmntent(fp.get())) != nullptr) { |
| if (mentry->mnt_dir == "/data"s) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| // Find all read+write block devices and emulated devices in /proc/mounts and add them to |
| // the correpsponding list. |
| static bool FindPartitionsToUmount(std::vector<MountEntry>* block_dev_partitions, |
| std::vector<MountEntry>* emulated_partitions, bool dump) { |
| std::unique_ptr<std::FILE, int (*)(std::FILE*)> fp(setmntent("/proc/mounts", "re"), endmntent); |
| if (fp == nullptr) { |
| PLOG(ERROR) << "Failed to open /proc/mounts"; |
| return false; |
| } |
| mntent* mentry; |
| while ((mentry = getmntent(fp.get())) != nullptr) { |
| if (dump) { |
| LOG(INFO) << "mount entry " << mentry->mnt_fsname << ":" << mentry->mnt_dir << " opts " |
| << mentry->mnt_opts << " type " << mentry->mnt_type; |
| } else if (MountEntry::IsBlockDevice(*mentry) && hasmntopt(mentry, "rw")) { |
| std::string mount_dir(mentry->mnt_dir); |
| // These are R/O partitions changed to R/W after adb remount. |
| // Do not umount them as shutdown critical services may rely on them. |
| if (mount_dir != "/" && mount_dir != "/system" && mount_dir != "/vendor" && |
| mount_dir != "/oem") { |
| block_dev_partitions->emplace(block_dev_partitions->begin(), *mentry); |
| } |
| } else if (MountEntry::IsEmulatedDevice(*mentry)) { |
| emulated_partitions->emplace(emulated_partitions->begin(), *mentry); |
| } |
| } |
| return true; |
| } |
| |
| static void DumpUmountDebuggingInfo() { |
| int status; |
| if (!security_getenforce()) { |
| LOG(INFO) << "Run lsof"; |
| const char* lsof_argv[] = {"/system/bin/lsof"}; |
| logwrap_fork_execvp(arraysize(lsof_argv), lsof_argv, &status, false, LOG_KLOG, true, |
| nullptr); |
| } |
| FindPartitionsToUmount(nullptr, nullptr, true); |
| // dump current CPU stack traces and uninterruptible tasks |
| WriteStringToFile("l", PROC_SYSRQ); |
| WriteStringToFile("w", PROC_SYSRQ); |
| } |
| |
| static UmountStat UmountPartitions(std::chrono::milliseconds timeout) { |
| Timer t; |
| /* data partition needs all pending writes to be completed and all emulated partitions |
| * umounted.If the current waiting is not good enough, give |
| * up and leave it to e2fsck after reboot to fix it. |
| */ |
| while (true) { |
| std::vector<MountEntry> block_devices; |
| std::vector<MountEntry> emulated_devices; |
| if (!FindPartitionsToUmount(&block_devices, &emulated_devices, false)) { |
| return UMOUNT_STAT_ERROR; |
| } |
| if (block_devices.size() == 0) { |
| return UMOUNT_STAT_SUCCESS; |
| } |
| bool unmount_done = true; |
| if (emulated_devices.size() > 0) { |
| for (auto& entry : emulated_devices) { |
| if (!entry.Umount(false)) unmount_done = false; |
| } |
| if (unmount_done) { |
| sync(); |
| } |
| } |
| for (auto& entry : block_devices) { |
| if (!entry.Umount(timeout == 0ms)) unmount_done = false; |
| } |
| if (unmount_done) { |
| return UMOUNT_STAT_SUCCESS; |
| } |
| if ((timeout < t.duration())) { // try umount at least once |
| return UMOUNT_STAT_TIMEOUT; |
| } |
| std::this_thread::sleep_for(100ms); |
| } |
| } |
| |
| static void KillAllProcesses() { |
| WriteStringToFile("i", PROC_SYSRQ); |
| } |
| |
| // Create reboot/shutdwon monitor thread |
| void RebootMonitorThread(unsigned int cmd, const std::string& reboot_target, |
| sem_t* reboot_semaphore, std::chrono::milliseconds shutdown_timeout, |
| bool* reboot_monitor_run) { |
| unsigned int remaining_shutdown_time = 0; |
| |
| // 300 seconds more than the timeout passed to the thread as there is a final Umount pass |
| // after the timeout is reached. |
| constexpr unsigned int shutdown_watchdog_timeout_default = 300; |
| auto shutdown_watchdog_timeout = android::base::GetUintProperty( |
| "ro.build.shutdown.watchdog.timeout", shutdown_watchdog_timeout_default); |
| remaining_shutdown_time = shutdown_watchdog_timeout + shutdown_timeout.count() / 1000; |
| |
| while (*reboot_monitor_run == true) { |
| if (TEMP_FAILURE_RETRY(sem_wait(reboot_semaphore)) == -1) { |
| LOG(ERROR) << "sem_wait failed and exit RebootMonitorThread()"; |
| return; |
| } |
| |
| timespec shutdown_timeout_timespec; |
| if (clock_gettime(CLOCK_MONOTONIC, &shutdown_timeout_timespec) == -1) { |
| LOG(ERROR) << "clock_gettime() fail! exit RebootMonitorThread()"; |
| return; |
| } |
| |
| // If there are some remaining shutdown time left from previous round, we use |
| // remaining time here. |
| shutdown_timeout_timespec.tv_sec += remaining_shutdown_time; |
| |
| LOG(INFO) << "shutdown_timeout_timespec.tv_sec: " << shutdown_timeout_timespec.tv_sec; |
| |
| int sem_return = 0; |
| while ((sem_return = sem_timedwait_monotonic_np(reboot_semaphore, |
| &shutdown_timeout_timespec)) == -1 && |
| errno == EINTR) { |
| } |
| |
| if (sem_return == -1) { |
| LOG(ERROR) << "Reboot thread timed out"; |
| |
| if (android::base::GetBoolProperty("ro.debuggable", false) == true) { |
| if (false) { |
| // SEPolicy will block debuggerd from running and this is intentional. |
| // But these lines are left to be enabled during debugging. |
| LOG(INFO) << "Try to dump init process call trace:"; |
| const char* vdc_argv[] = {"/system/bin/debuggerd", "-b", "1"}; |
| int status; |
| logwrap_fork_execvp(arraysize(vdc_argv), vdc_argv, &status, false, LOG_KLOG, |
| true, nullptr); |
| } |
| LOG(INFO) << "Show stack for all active CPU:"; |
| WriteStringToFile("l", PROC_SYSRQ); |
| |
| LOG(INFO) << "Show tasks that are in disk sleep(uninterruptable sleep), which are " |
| "like " |
| "blocked in mutex or hardware register access:"; |
| WriteStringToFile("w", PROC_SYSRQ); |
| } |
| |
| // In shutdown case,notify kernel to sync and umount fs to read-only before shutdown. |
| if (cmd == ANDROID_RB_POWEROFF || cmd == ANDROID_RB_THERMOFF) { |
| WriteStringToFile("s", PROC_SYSRQ); |
| |
| WriteStringToFile("u", PROC_SYSRQ); |
| |
| RebootSystem(cmd, reboot_target); |
| } |
| |
| LOG(ERROR) << "Trigger crash at last!"; |
| WriteStringToFile("c", PROC_SYSRQ); |
| } else { |
| timespec current_time_timespec; |
| |
| if (clock_gettime(CLOCK_MONOTONIC, ¤t_time_timespec) == -1) { |
| LOG(ERROR) << "clock_gettime() fail! exit RebootMonitorThread()"; |
| return; |
| } |
| |
| remaining_shutdown_time = |
| shutdown_timeout_timespec.tv_sec - current_time_timespec.tv_sec; |
| |
| LOG(INFO) << "remaining_shutdown_time: " << remaining_shutdown_time; |
| } |
| } |
| } |
| |
| /* Try umounting all emulated file systems R/W block device cfile systems. |
| * This will just try umount and give it up if it fails. |
| * For fs like ext4, this is ok as file system will be marked as unclean shutdown |
| * and necessary check can be done at the next reboot. |
| * For safer shutdown, caller needs to make sure that |
| * all processes / emulated partition for the target fs are all cleaned-up. |
| * |
| * return true when umount was successful. false when timed out. |
| */ |
| static UmountStat TryUmountAndFsck(unsigned int cmd, bool run_fsck, |
| std::chrono::milliseconds timeout, sem_t* reboot_semaphore) { |
| Timer t; |
| std::vector<MountEntry> block_devices; |
| std::vector<MountEntry> emulated_devices; |
| |
| if (run_fsck && !FindPartitionsToUmount(&block_devices, &emulated_devices, false)) { |
| return UMOUNT_STAT_ERROR; |
| } |
| |
| UmountStat stat = UmountPartitions(timeout - t.duration()); |
| if (stat != UMOUNT_STAT_SUCCESS) { |
| LOG(INFO) << "umount timeout, last resort, kill all and try"; |
| if (DUMP_ON_UMOUNT_FAILURE) DumpUmountDebuggingInfo(); |
| KillAllProcesses(); |
| // even if it succeeds, still it is timeout and do not run fsck with all processes killed |
| UmountStat st = UmountPartitions(0ms); |
| if ((st != UMOUNT_STAT_SUCCESS) && DUMP_ON_UMOUNT_FAILURE) DumpUmountDebuggingInfo(); |
| } |
| |
| if (stat == UMOUNT_STAT_SUCCESS && run_fsck) { |
| LOG(INFO) << "Pause reboot monitor thread before fsck"; |
| sem_post(reboot_semaphore); |
| |
| // fsck part is excluded from timeout check. It only runs for user initiated shutdown |
| // and should not affect reboot time. |
| for (auto& entry : block_devices) { |
| entry.DoFsck(); |
| } |
| |
| LOG(INFO) << "Resume reboot monitor thread after fsck"; |
| sem_post(reboot_semaphore); |
| } |
| return stat; |
| } |
| |
| // zram is able to use backing device on top of a loopback device. |
| // In order to unmount /data successfully, we have to kill the loopback device first |
| #define ZRAM_DEVICE "/dev/block/zram0" |
| #define ZRAM_RESET "/sys/block/zram0/reset" |
| #define ZRAM_BACK_DEV "/sys/block/zram0/backing_dev" |
| static Result<void> KillZramBackingDevice() { |
| if (access(ZRAM_BACK_DEV, F_OK) != 0 && errno == ENOENT) { |
| LOG(INFO) << "No zram backing device configured"; |
| return {}; |
| } |
| std::string backing_dev; |
| if (!android::base::ReadFileToString(ZRAM_BACK_DEV, &backing_dev)) { |
| return ErrnoError() << "Failed to read " << ZRAM_BACK_DEV; |
| } |
| |
| // cut the last "\n" |
| backing_dev.erase(backing_dev.length() - 1); |
| |
| // shutdown zram handle |
| Timer swap_timer; |
| LOG(INFO) << "swapoff() start..."; |
| if (swapoff(ZRAM_DEVICE) == -1) { |
| return ErrnoError() << "zram_backing_dev: swapoff (" << backing_dev << ")" |
| << " failed"; |
| } |
| LOG(INFO) << "swapoff() took " << swap_timer;; |
| |
| if (!WriteStringToFile("1", ZRAM_RESET)) { |
| return Error() << "zram_backing_dev: reset (" << backing_dev << ")" |
| << " failed"; |
| } |
| |
| if (!android::base::StartsWith(backing_dev, "/dev/block/loop")) { |
| LOG(INFO) << backing_dev << " is not a loop device. Exiting early"; |
| return {}; |
| } |
| |
| // clear loopback device |
| unique_fd loop(TEMP_FAILURE_RETRY(open(backing_dev.c_str(), O_RDWR | O_CLOEXEC))); |
| if (loop.get() < 0) { |
| return ErrnoError() << "zram_backing_dev: open(" << backing_dev << ")" |
| << " failed"; |
| } |
| |
| if (ioctl(loop.get(), LOOP_CLR_FD, 0) < 0) { |
| return ErrnoError() << "zram_backing_dev: loop_clear (" << backing_dev << ")" |
| << " failed"; |
| } |
| LOG(INFO) << "zram_backing_dev: `" << backing_dev << "` is cleared successfully."; |
| return {}; |
| } |
| |
| // Stops given services, waits for them to be stopped for |timeout| ms. |
| // If terminate is true, then SIGTERM is sent to services, otherwise SIGKILL is sent. |
| static void StopServices(const std::vector<Service*>& services, std::chrono::milliseconds timeout, |
| bool terminate) { |
| LOG(INFO) << "Stopping " << services.size() << " services by sending " |
| << (terminate ? "SIGTERM" : "SIGKILL"); |
| std::vector<pid_t> pids; |
| pids.reserve(services.size()); |
| for (const auto& s : services) { |
| if (s->pid() > 0) { |
| pids.push_back(s->pid()); |
| } |
| if (terminate) { |
| s->Terminate(); |
| } else { |
| s->Stop(); |
| } |
| } |
| if (timeout > 0ms) { |
| WaitToBeReaped(pids, timeout); |
| } else { |
| // Even if we don't to wait for services to stop, we still optimistically reap zombies. |
| ReapAnyOutstandingChildren(); |
| } |
| } |
| |
| // Like StopServices, but also logs all the services that failed to stop after the provided timeout. |
| // Returns number of violators. |
| static int StopServicesAndLogViolations(const std::vector<Service*>& services, |
| std::chrono::milliseconds timeout, bool terminate) { |
| StopServices(services, timeout, terminate); |
| int still_running = 0; |
| for (const auto& s : services) { |
| if (s->IsRunning()) { |
| LOG(ERROR) << "[service-misbehaving] : service '" << s->name() << "' is still running " |
| << timeout.count() << "ms after receiving " |
| << (terminate ? "SIGTERM" : "SIGKILL"); |
| still_running++; |
| } |
| } |
| return still_running; |
| } |
| |
| //* Reboot / shutdown the system. |
| // cmd ANDROID_RB_* as defined in android_reboot.h |
| // reason Reason string like "reboot", "shutdown,userrequested" |
| // reboot_target Reboot target string like "bootloader". Otherwise, it should be an empty string. |
| // run_fsck Whether to run fsck after umount is done. |
| // |
| static void DoReboot(unsigned int cmd, const std::string& reason, const std::string& reboot_target, |
| bool run_fsck) { |
| Timer t; |
| LOG(INFO) << "Reboot start, reason: " << reason << ", reboot_target: " << reboot_target; |
| |
| bool is_thermal_shutdown = cmd == ANDROID_RB_THERMOFF; |
| |
| auto shutdown_timeout = 0ms; |
| if (!SHUTDOWN_ZERO_TIMEOUT) { |
| constexpr unsigned int shutdown_timeout_default = 6; |
| constexpr unsigned int max_thermal_shutdown_timeout = 3; |
| auto shutdown_timeout_final = android::base::GetUintProperty("ro.build.shutdown_timeout", |
| shutdown_timeout_default); |
| if (is_thermal_shutdown && shutdown_timeout_final > max_thermal_shutdown_timeout) { |
| shutdown_timeout_final = max_thermal_shutdown_timeout; |
| } |
| shutdown_timeout = std::chrono::seconds(shutdown_timeout_final); |
| } |
| LOG(INFO) << "Shutdown timeout: " << shutdown_timeout.count() << " ms"; |
| |
| sem_t reboot_semaphore; |
| if (sem_init(&reboot_semaphore, false, 0) == -1) { |
| // These should never fail, but if they do, skip the graceful reboot and reboot immediately. |
| LOG(ERROR) << "sem_init() fail and RebootSystem() return!"; |
| RebootSystem(cmd, reboot_target); |
| } |
| |
| // Start a thread to monitor init shutdown process |
| LOG(INFO) << "Create reboot monitor thread."; |
| bool reboot_monitor_run = true; |
| std::thread reboot_monitor_thread(&RebootMonitorThread, cmd, reboot_target, &reboot_semaphore, |
| shutdown_timeout, &reboot_monitor_run); |
| reboot_monitor_thread.detach(); |
| |
| // Start reboot monitor thread |
| sem_post(&reboot_semaphore); |
| |
| // Ensure last reboot reason is reduced to canonical |
| // alias reported in bootloader or system boot reason. |
| size_t skip = 0; |
| std::vector<std::string> reasons = Split(reason, ","); |
| if (reasons.size() >= 2 && reasons[0] == "reboot" && |
| (reasons[1] == "recovery" || reasons[1] == "bootloader" || reasons[1] == "cold" || |
| reasons[1] == "hard" || reasons[1] == "warm")) { |
| skip = strlen("reboot,"); |
| } |
| PersistRebootReason(reason.c_str() + skip, true); |
| |
| // If /data isn't mounted then we can skip the extra reboot steps below, since we don't need to |
| // worry about unmounting it. |
| if (!IsDataMounted()) { |
| sync(); |
| RebootSystem(cmd, reboot_target); |
| abort(); |
| } |
| |
| // watchdogd is a vendor specific component but should be alive to complete shutdown safely. |
| const std::set<std::string> to_starts{"watchdogd"}; |
| std::vector<Service*> stop_first; |
| stop_first.reserve(ServiceList::GetInstance().services().size()); |
| for (const auto& s : ServiceList::GetInstance()) { |
| if (kDebuggingServices.count(s->name())) { |
| // keep debugging tools until non critical ones are all gone. |
| s->SetShutdownCritical(); |
| } else if (to_starts.count(s->name())) { |
| if (auto result = s->Start(); !result.ok()) { |
| LOG(ERROR) << "Could not start shutdown 'to_start' service '" << s->name() |
| << "': " << result.error(); |
| } |
| s->SetShutdownCritical(); |
| } else if (s->IsShutdownCritical()) { |
| // Start shutdown critical service if not started. |
| if (auto result = s->Start(); !result.ok()) { |
| LOG(ERROR) << "Could not start shutdown critical service '" << s->name() |
| << "': " << result.error(); |
| } |
| } else { |
| stop_first.push_back(s.get()); |
| } |
| } |
| |
| // remaining operations (specifically fsck) may take a substantial duration |
| if (cmd == ANDROID_RB_POWEROFF || is_thermal_shutdown) { |
| TurnOffBacklight(); |
| } |
| |
| Service* boot_anim = ServiceList::GetInstance().FindService("bootanim"); |
| Service* surface_flinger = ServiceList::GetInstance().FindService("surfaceflinger"); |
| if (boot_anim != nullptr && surface_flinger != nullptr && surface_flinger->IsRunning()) { |
| bool do_shutdown_animation = GetBoolProperty("ro.init.shutdown_animation", false); |
| |
| if (do_shutdown_animation) { |
| SetProperty("service.bootanim.exit", "0"); |
| // Could be in the middle of animation. Stop and start so that it can pick |
| // up the right mode. |
| boot_anim->Stop(); |
| } |
| |
| for (const auto& service : ServiceList::GetInstance()) { |
| if (service->classnames().count("animation") == 0) { |
| continue; |
| } |
| |
| // start all animation classes if stopped. |
| if (do_shutdown_animation) { |
| service->Start(); |
| } |
| service->SetShutdownCritical(); // will not check animation class separately |
| } |
| |
| if (do_shutdown_animation) { |
| boot_anim->Start(); |
| surface_flinger->SetShutdownCritical(); |
| boot_anim->SetShutdownCritical(); |
| } |
| } |
| |
| // optional shutdown step |
| // 1. terminate all services except shutdown critical ones. wait for delay to finish |
| if (shutdown_timeout > 0ms) { |
| StopServicesAndLogViolations(stop_first, shutdown_timeout / 2, true /* SIGTERM */); |
| } |
| // Send SIGKILL to ones that didn't terminate cleanly. |
| StopServicesAndLogViolations(stop_first, 0ms, false /* SIGKILL */); |
| SubcontextTerminate(); |
| // Reap subcontext pids. |
| ReapAnyOutstandingChildren(); |
| |
| // 3. send volume abort_fuse and volume shutdown to vold |
| Service* vold_service = ServiceList::GetInstance().FindService("vold"); |
| if (vold_service != nullptr && vold_service->IsRunning()) { |
| // Manually abort FUSE connections, since the FUSE daemon is already dead |
| // at this point, and unmounting it might hang. |
| CallVdc("volume", "abort_fuse"); |
| CallVdc("volume", "shutdown"); |
| vold_service->Stop(); |
| } else { |
| LOG(INFO) << "vold not running, skipping vold shutdown"; |
| } |
| // logcat stopped here |
| StopServices(GetDebuggingServices(false /* only_post_data */), 0ms, false /* SIGKILL */); |
| // 4. sync, try umount, and optionally run fsck for user shutdown |
| { |
| Timer sync_timer; |
| LOG(INFO) << "sync() before umount..."; |
| sync(); |
| LOG(INFO) << "sync() before umount took" << sync_timer; |
| } |
| // 5. drop caches and disable zram backing device, if exist |
| KillZramBackingDevice(); |
| |
| UmountStat stat = |
| TryUmountAndFsck(cmd, run_fsck, shutdown_timeout - t.duration(), &reboot_semaphore); |
| // Follow what linux shutdown is doing: one more sync with little bit delay |
| { |
| Timer sync_timer; |
| LOG(INFO) << "sync() after umount..."; |
| sync(); |
| LOG(INFO) << "sync() after umount took" << sync_timer; |
| } |
| if (!is_thermal_shutdown) std::this_thread::sleep_for(100ms); |
| LogShutdownTime(stat, &t); |
| |
| // Send signal to terminate reboot monitor thread. |
| reboot_monitor_run = false; |
| sem_post(&reboot_semaphore); |
| |
| // Reboot regardless of umount status. If umount fails, fsck after reboot will fix it. |
| RebootSystem(cmd, reboot_target); |
| abort(); |
| } |
| |
| static void EnterShutdown() { |
| LOG(INFO) << "Entering shutdown mode"; |
| shutting_down = true; |
| // Skip wait for prop if it is in progress |
| ResetWaitForProp(); |
| // Clear EXEC flag if there is one pending |
| for (const auto& s : ServiceList::GetInstance()) { |
| s->UnSetExec(); |
| } |
| } |
| |
| static void LeaveShutdown() { |
| LOG(INFO) << "Leaving shutdown mode"; |
| shutting_down = false; |
| StartSendingMessages(); |
| } |
| |
| static Result<void> UnmountAllApexes() { |
| const char* args[] = {"/system/bin/apexd", "--unmount-all"}; |
| int status; |
| if (logwrap_fork_execvp(arraysize(args), args, &status, false, LOG_KLOG, true, nullptr) != 0) { |
| return ErrnoError() << "Failed to call '/system/bin/apexd --unmount-all'"; |
| } |
| if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { |
| return {}; |
| } |
| return Error() << "'/system/bin/apexd --unmount-all' failed : " << status; |
| } |
| |
| static std::chrono::milliseconds GetMillisProperty(const std::string& name, |
| std::chrono::milliseconds default_value) { |
| auto value = GetUintProperty(name, static_cast<uint64_t>(default_value.count())); |
| return std::chrono::milliseconds(std::move(value)); |
| } |
| |
| static Result<void> DoUserspaceReboot() { |
| LOG(INFO) << "Userspace reboot initiated"; |
| // An ugly way to pass a more precise reason on why fallback to hard reboot was triggered. |
| std::string sub_reason = ""; |
| auto guard = android::base::make_scope_guard([&sub_reason] { |
| // Leave shutdown so that we can handle a full reboot. |
| LeaveShutdown(); |
| trigger_shutdown("reboot,userspace_failed,shutdown_aborted," + sub_reason); |
| }); |
| // Triggering userspace-reboot-requested will result in a bunch of setprop |
| // actions. We should make sure, that all of them are propagated before |
| // proceeding with userspace reboot. Synchronously setting sys.init.userspace_reboot.in_progress |
| // property is not perfect, but it should do the trick. |
| if (!android::sysprop::InitProperties::userspace_reboot_in_progress(true)) { |
| sub_reason = "setprop"; |
| return Error() << "Failed to set sys.init.userspace_reboot.in_progress property"; |
| } |
| EnterShutdown(); |
| if (!SetProperty("sys.powerctl", "")) { |
| sub_reason = "resetprop"; |
| return Error() << "Failed to reset sys.powerctl property"; |
| } |
| std::vector<Service*> stop_first; |
| // Remember the services that were enabled. We will need to manually enable them again otherwise |
| // triggers like class_start won't restart them. |
| std::vector<Service*> were_enabled; |
| stop_first.reserve(ServiceList::GetInstance().services().size()); |
| for (const auto& s : ServiceList::GetInstance().services_in_shutdown_order()) { |
| if (s->is_post_data() && !kDebuggingServices.count(s->name())) { |
| stop_first.push_back(s); |
| } |
| if (s->is_post_data() && s->IsEnabled()) { |
| were_enabled.push_back(s); |
| } |
| } |
| { |
| Timer sync_timer; |
| LOG(INFO) << "sync() before terminating services..."; |
| sync(); |
| LOG(INFO) << "sync() took " << sync_timer; |
| } |
| auto sigterm_timeout = GetMillisProperty("init.userspace_reboot.sigterm.timeoutmillis", 5s); |
| auto sigkill_timeout = GetMillisProperty("init.userspace_reboot.sigkill.timeoutmillis", 10s); |
| LOG(INFO) << "Timeout to terminate services: " << sigterm_timeout.count() << "ms " |
| << "Timeout to kill services: " << sigkill_timeout.count() << "ms"; |
| StopServicesAndLogViolations(stop_first, sigterm_timeout, true /* SIGTERM */); |
| if (int r = StopServicesAndLogViolations(stop_first, sigkill_timeout, false /* SIGKILL */); |
| r > 0) { |
| sub_reason = "sigkill"; |
| // TODO(b/135984674): store information about offending services for debugging. |
| return Error() << r << " post-data services are still running"; |
| } |
| if (auto result = KillZramBackingDevice(); !result.ok()) { |
| sub_reason = "zram"; |
| return result; |
| } |
| if (auto result = CallVdc("volume", "reset"); !result.ok()) { |
| sub_reason = "vold_reset"; |
| return result; |
| } |
| if (int r = StopServicesAndLogViolations(GetDebuggingServices(true /* only_post_data */), |
| sigkill_timeout, false /* SIGKILL */); |
| r > 0) { |
| sub_reason = "sigkill_debug"; |
| // TODO(b/135984674): store information about offending services for debugging. |
| return Error() << r << " debugging services are still running"; |
| } |
| { |
| Timer sync_timer; |
| LOG(INFO) << "sync() after stopping services..."; |
| sync(); |
| LOG(INFO) << "sync() took " << sync_timer; |
| } |
| if (auto result = UnmountAllApexes(); !result.ok()) { |
| sub_reason = "apex"; |
| return result; |
| } |
| if (!SwitchToBootstrapMountNamespaceIfNeeded()) { |
| sub_reason = "ns_switch"; |
| return Error() << "Failed to switch to bootstrap namespace"; |
| } |
| // Remove services that were defined in an APEX. |
| ServiceList::GetInstance().RemoveServiceIf([](const std::unique_ptr<Service>& s) -> bool { |
| if (s->is_from_apex()) { |
| LOG(INFO) << "Removing service '" << s->name() << "' because it's defined in an APEX"; |
| return true; |
| } |
| return false; |
| }); |
| // Re-enable services |
| for (const auto& s : were_enabled) { |
| LOG(INFO) << "Re-enabling service '" << s->name() << "'"; |
| s->Enable(); |
| } |
| ServiceList::GetInstance().ResetState(); |
| LeaveShutdown(); |
| ActionManager::GetInstance().QueueEventTrigger("userspace-reboot-resume"); |
| guard.Disable(); // Go on with userspace reboot. |
| return {}; |
| } |
| |
| static void UserspaceRebootWatchdogThread() { |
| auto started_timeout = GetMillisProperty("init.userspace_reboot.started.timeoutmillis", 10s); |
| if (!WaitForProperty("sys.init.userspace_reboot.in_progress", "1", started_timeout)) { |
| LOG(ERROR) << "Userspace reboot didn't start in " << started_timeout.count() |
| << "ms. Switching to full reboot"; |
| // Init might be wedged, don't try to write reboot reason into a persistent property and do |
| // a dirty reboot. |
| PersistRebootReason("userspace_failed,watchdog_triggered,failed_to_start", false); |
| RebootSystem(ANDROID_RB_RESTART2, "userspace_failed,watchdog_triggered,failed_to_start"); |
| } |
| LOG(INFO) << "Starting userspace reboot watchdog"; |
| auto watchdog_timeout = GetMillisProperty("init.userspace_reboot.watchdog.timeoutmillis", 5min); |
| LOG(INFO) << "UserspaceRebootWatchdog timeout: " << watchdog_timeout.count() << "ms"; |
| if (!WaitForProperty("sys.boot_completed", "1", watchdog_timeout)) { |
| LOG(ERROR) << "Failed to boot in " << watchdog_timeout.count() |
| << "ms. Switching to full reboot"; |
| // In this case device is in a boot loop. Only way to recover is to do dirty reboot. |
| // Since init might be wedged, don't try to write reboot reason into a persistent property. |
| PersistRebootReason("userspace_failed,watchdog_triggered,failed_to_boot", false); |
| RebootSystem(ANDROID_RB_RESTART2, "userspace_failed,watchdog_triggered,failed_to_boot"); |
| } |
| LOG(INFO) << "Device booted, stopping userspace reboot watchdog"; |
| } |
| |
| static void HandleUserspaceReboot() { |
| if (!android::sysprop::InitProperties::is_userspace_reboot_supported().value_or(false)) { |
| LOG(ERROR) << "Attempted a userspace reboot on a device that doesn't support it"; |
| return; |
| } |
| // Spinnig up a separate thread will fail the setns call later in the boot sequence. |
| // Fork a new process to monitor userspace reboot while we are investigating a better solution. |
| pid_t pid = fork(); |
| if (pid < 0) { |
| PLOG(ERROR) << "Failed to fork process for userspace reboot watchdog. Switching to full " |
| << "reboot"; |
| trigger_shutdown("reboot,userspace_failed,watchdog_fork"); |
| return; |
| } |
| if (pid == 0) { |
| // Child |
| UserspaceRebootWatchdogThread(); |
| _exit(EXIT_SUCCESS); |
| } |
| LOG(INFO) << "Clearing queue and starting userspace-reboot-requested trigger"; |
| auto& am = ActionManager::GetInstance(); |
| am.ClearQueue(); |
| am.QueueEventTrigger("userspace-reboot-requested"); |
| auto handler = [](const BuiltinArguments&) { return DoUserspaceReboot(); }; |
| am.QueueBuiltinAction(handler, "userspace-reboot"); |
| } |
| |
| /** |
| * Check if "command" field is set in bootloader message. |
| * |
| * If "command" field is broken (contains non-printable characters prior to |
| * terminating zero), it will be zeroed. |
| * |
| * @param[in,out] boot Bootloader message (BCB) structure |
| * @return true if "command" field is already set, and false if it's empty |
| */ |
| static bool CommandIsPresent(bootloader_message* boot) { |
| if (boot->command[0] == '\0') |
| return false; |
| |
| for (size_t i = 0; i < arraysize(boot->command); ++i) { |
| if (boot->command[i] == '\0') |
| return true; |
| if (!isprint(boot->command[i])) |
| break; |
| } |
| |
| memset(boot->command, 0, sizeof(boot->command)); |
| return false; |
| } |
| |
| void HandlePowerctlMessage(const std::string& command) { |
| unsigned int cmd = 0; |
| std::vector<std::string> cmd_params = Split(command, ","); |
| std::string reboot_target = ""; |
| bool run_fsck = false; |
| bool command_invalid = false; |
| bool userspace_reboot = false; |
| |
| if (cmd_params[0] == "shutdown") { |
| cmd = ANDROID_RB_POWEROFF; |
| if (cmd_params.size() >= 2) { |
| if (cmd_params[1] == "userrequested") { |
| // The shutdown reason is PowerManager.SHUTDOWN_USER_REQUESTED. |
| // Run fsck once the file system is remounted in read-only mode. |
| run_fsck = true; |
| } else if (cmd_params[1] == "thermal") { |
| // Turn off sources of heat immediately. |
| TurnOffBacklight(); |
| // run_fsck is false to avoid delay |
| cmd = ANDROID_RB_THERMOFF; |
| } |
| } |
| } else if (cmd_params[0] == "reboot") { |
| cmd = ANDROID_RB_RESTART2; |
| if (cmd_params.size() >= 2) { |
| reboot_target = cmd_params[1]; |
| if (reboot_target == "userspace") { |
| LOG(INFO) << "Userspace reboot requested"; |
| userspace_reboot = true; |
| } |
| // adb reboot fastboot should boot into bootloader for devices not |
| // supporting logical partitions. |
| if (reboot_target == "fastboot" && |
| !android::base::GetBoolProperty("ro.boot.dynamic_partitions", false)) { |
| reboot_target = "bootloader"; |
| } |
| // When rebooting to the bootloader notify the bootloader writing |
| // also the BCB. |
| if (reboot_target == "bootloader") { |
| std::string err; |
| if (!write_reboot_bootloader(&err)) { |
| LOG(ERROR) << "reboot-bootloader: Error writing " |
| "bootloader_message: " |
| << err; |
| } |
| } else if (reboot_target == "recovery") { |
| bootloader_message boot = {}; |
| if (std::string err; !read_bootloader_message(&boot, &err)) { |
| LOG(ERROR) << "Failed to read bootloader message: " << err; |
| } |
| // Update the boot command field if it's empty, and preserve |
| // the other arguments in the bootloader message. |
| if (!CommandIsPresent(&boot)) { |
| strlcpy(boot.command, "boot-recovery", sizeof(boot.command)); |
| if (std::string err; !write_bootloader_message(boot, &err)) { |
| LOG(ERROR) << "Failed to set bootloader message: " << err; |
| return; |
| } |
| } |
| } else if (reboot_target == "sideload" || reboot_target == "sideload-auto-reboot" || |
| reboot_target == "fastboot") { |
| std::string arg = reboot_target == "sideload-auto-reboot" ? "sideload_auto_reboot" |
| : reboot_target; |
| const std::vector<std::string> options = { |
| "--" + arg, |
| }; |
| std::string err; |
| if (!write_bootloader_message(options, &err)) { |
| LOG(ERROR) << "Failed to set bootloader message: " << err; |
| return; |
| } |
| reboot_target = "recovery"; |
| } |
| |
| // If there are additional parameter, pass them along |
| for (size_t i = 2; (cmd_params.size() > i) && cmd_params[i].size(); ++i) { |
| reboot_target += "," + cmd_params[i]; |
| } |
| } |
| } else { |
| command_invalid = true; |
| } |
| if (command_invalid) { |
| LOG(ERROR) << "powerctl: unrecognized command '" << command << "'"; |
| return; |
| } |
| |
| // We do not want to process any messages (queue'ing triggers, shutdown messages, control |
| // messages, etc) from properties during reboot. |
| StopSendingMessages(); |
| |
| if (userspace_reboot) { |
| HandleUserspaceReboot(); |
| return; |
| } |
| |
| LOG(INFO) << "Clear action queue and start shutdown trigger"; |
| ActionManager::GetInstance().ClearQueue(); |
| // Queue shutdown trigger first |
| ActionManager::GetInstance().QueueEventTrigger("shutdown"); |
| // Queue built-in shutdown_done |
| auto shutdown_handler = [cmd, command, reboot_target, run_fsck](const BuiltinArguments&) { |
| DoReboot(cmd, command, reboot_target, run_fsck); |
| return Result<void>{}; |
| }; |
| ActionManager::GetInstance().QueueBuiltinAction(shutdown_handler, "shutdown_done"); |
| |
| EnterShutdown(); |
| } |
| |
| bool IsShuttingDown() { |
| return shutting_down; |
| } |
| |
| } // namespace init |
| } // namespace android |
