| /* |
| * Copyright (C) 2008 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 <ctype.h> |
| #include <dirent.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <libgen.h> |
| #include <paths.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/epoll.h> |
| #include <sys/mount.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/un.h> |
| #include <sys/wait.h> |
| #include <termios.h> |
| #include <unistd.h> |
| |
| #include <mtd/mtd-user.h> |
| |
| #include <selinux/selinux.h> |
| #include <selinux/label.h> |
| #include <selinux/android.h> |
| |
| #include <base/file.h> |
| #include <base/stringprintf.h> |
| #include <cutils/android_reboot.h> |
| #include <cutils/fs.h> |
| #include <cutils/iosched_policy.h> |
| #include <cutils/list.h> |
| #include <cutils/sockets.h> |
| #include <private/android_filesystem_config.h> |
| |
| #include <memory> |
| |
| #include "devices.h" |
| #include "init.h" |
| #include "log.h" |
| #include "property_service.h" |
| #include "bootchart.h" |
| #include "signal_handler.h" |
| #include "keychords.h" |
| #include "init_parser.h" |
| #include "util.h" |
| #include "ueventd.h" |
| #include "watchdogd.h" |
| |
| struct selabel_handle *sehandle; |
| struct selabel_handle *sehandle_prop; |
| |
| static int property_triggers_enabled = 0; |
| |
| static char qemu[32]; |
| |
| static struct action *cur_action = NULL; |
| static struct command *cur_command = NULL; |
| |
| static int have_console; |
| static char console_name[PROP_VALUE_MAX] = "/dev/console"; |
| static time_t process_needs_restart; |
| |
| static const char *ENV[32]; |
| |
| bool waiting_for_exec = false; |
| |
| static int epoll_fd = -1; |
| |
| void register_epoll_handler(int fd, void (*fn)()) { |
| epoll_event ev; |
| ev.events = EPOLLIN; |
| ev.data.ptr = reinterpret_cast<void*>(fn); |
| if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) { |
| ERROR("epoll_ctl failed: %s\n", strerror(errno)); |
| } |
| } |
| |
| void service::NotifyStateChange(const char* new_state) { |
| if (!properties_initialized()) { |
| // If properties aren't available yet, we can't set them. |
| return; |
| } |
| |
| if ((flags & SVC_EXEC) != 0) { |
| // 'exec' commands don't have properties tracking their state. |
| return; |
| } |
| |
| char prop_name[PROP_NAME_MAX]; |
| if (snprintf(prop_name, sizeof(prop_name), "init.svc.%s", name) >= PROP_NAME_MAX) { |
| // If the property name would be too long, we can't set it. |
| ERROR("Property name \"init.svc.%s\" too long; not setting to %s\n", name, new_state); |
| return; |
| } |
| |
| property_set(prop_name, new_state); |
| } |
| |
| /* add_environment - add "key=value" to the current environment */ |
| int add_environment(const char *key, const char *val) |
| { |
| size_t n; |
| size_t key_len = strlen(key); |
| |
| /* The last environment entry is reserved to terminate the list */ |
| for (n = 0; n < (ARRAY_SIZE(ENV) - 1); n++) { |
| |
| /* Delete any existing entry for this key */ |
| if (ENV[n] != NULL) { |
| size_t entry_key_len = strcspn(ENV[n], "="); |
| if ((entry_key_len == key_len) && (strncmp(ENV[n], key, entry_key_len) == 0)) { |
| free((char*)ENV[n]); |
| ENV[n] = NULL; |
| } |
| } |
| |
| /* Add entry if a free slot is available */ |
| if (ENV[n] == NULL) { |
| char* entry; |
| asprintf(&entry, "%s=%s", key, val); |
| ENV[n] = entry; |
| return 0; |
| } |
| } |
| |
| ERROR("No env. room to store: '%s':'%s'\n", key, val); |
| |
| return -1; |
| } |
| |
| void zap_stdio(void) |
| { |
| int fd; |
| fd = open("/dev/null", O_RDWR); |
| dup2(fd, 0); |
| dup2(fd, 1); |
| dup2(fd, 2); |
| close(fd); |
| } |
| |
| static void open_console() |
| { |
| int fd; |
| if ((fd = open(console_name, O_RDWR)) < 0) { |
| fd = open("/dev/null", O_RDWR); |
| } |
| ioctl(fd, TIOCSCTTY, 0); |
| dup2(fd, 0); |
| dup2(fd, 1); |
| dup2(fd, 2); |
| close(fd); |
| } |
| |
| static void publish_socket(const char *name, int fd) |
| { |
| char key[64] = ANDROID_SOCKET_ENV_PREFIX; |
| char val[64]; |
| |
| strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1, |
| name, |
| sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX)); |
| snprintf(val, sizeof(val), "%d", fd); |
| add_environment(key, val); |
| |
| /* make sure we don't close-on-exec */ |
| fcntl(fd, F_SETFD, 0); |
| } |
| |
| void service_start(struct service *svc, const char *dynamic_args) |
| { |
| // Starting a service removes it from the disabled or reset state and |
| // immediately takes it out of the restarting state if it was in there. |
| svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING|SVC_RESET|SVC_RESTART|SVC_DISABLED_START)); |
| svc->time_started = 0; |
| |
| // Running processes require no additional work --- if they're in the |
| // process of exiting, we've ensured that they will immediately restart |
| // on exit, unless they are ONESHOT. |
| if (svc->flags & SVC_RUNNING) { |
| return; |
| } |
| |
| bool needs_console = (svc->flags & SVC_CONSOLE); |
| if (needs_console && !have_console) { |
| ERROR("service '%s' requires console\n", svc->name); |
| svc->flags |= SVC_DISABLED; |
| return; |
| } |
| |
| struct stat s; |
| if (stat(svc->args[0], &s) != 0) { |
| ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name); |
| svc->flags |= SVC_DISABLED; |
| return; |
| } |
| |
| if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) { |
| ERROR("service '%s' must be one-shot to use dynamic args, disabling\n", |
| svc->args[0]); |
| svc->flags |= SVC_DISABLED; |
| return; |
| } |
| |
| char* scon = NULL; |
| if (is_selinux_enabled() > 0) { |
| if (svc->seclabel) { |
| scon = strdup(svc->seclabel); |
| if (!scon) { |
| ERROR("Out of memory while starting '%s'\n", svc->name); |
| return; |
| } |
| } else { |
| char *mycon = NULL, *fcon = NULL; |
| |
| INFO("computing context for service '%s'\n", svc->args[0]); |
| int rc = getcon(&mycon); |
| if (rc < 0) { |
| ERROR("could not get context while starting '%s'\n", svc->name); |
| return; |
| } |
| |
| rc = getfilecon(svc->args[0], &fcon); |
| if (rc < 0) { |
| ERROR("could not get context while starting '%s'\n", svc->name); |
| freecon(mycon); |
| return; |
| } |
| |
| rc = security_compute_create(mycon, fcon, string_to_security_class("process"), &scon); |
| if (rc == 0 && !strcmp(scon, mycon)) { |
| ERROR("Warning! Service %s needs a SELinux domain defined; please fix!\n", svc->name); |
| } |
| freecon(mycon); |
| freecon(fcon); |
| if (rc < 0) { |
| ERROR("could not get context while starting '%s'\n", svc->name); |
| return; |
| } |
| } |
| } |
| |
| NOTICE("Starting service '%s'...\n", svc->name); |
| |
| pid_t pid = fork(); |
| if (pid == 0) { |
| struct socketinfo *si; |
| struct svcenvinfo *ei; |
| char tmp[32]; |
| int fd, sz; |
| |
| umask(077); |
| if (properties_initialized()) { |
| get_property_workspace(&fd, &sz); |
| snprintf(tmp, sizeof(tmp), "%d,%d", dup(fd), sz); |
| add_environment("ANDROID_PROPERTY_WORKSPACE", tmp); |
| } |
| |
| for (ei = svc->envvars; ei; ei = ei->next) |
| add_environment(ei->name, ei->value); |
| |
| for (si = svc->sockets; si; si = si->next) { |
| int socket_type = ( |
| !strcmp(si->type, "stream") ? SOCK_STREAM : |
| (!strcmp(si->type, "dgram") ? SOCK_DGRAM : SOCK_SEQPACKET)); |
| int s = create_socket(si->name, socket_type, |
| si->perm, si->uid, si->gid, si->socketcon ?: scon); |
| if (s >= 0) { |
| publish_socket(si->name, s); |
| } |
| } |
| |
| freecon(scon); |
| scon = NULL; |
| |
| if (svc->ioprio_class != IoSchedClass_NONE) { |
| if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) { |
| ERROR("Failed to set pid %d ioprio = %d,%d: %s\n", |
| getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno)); |
| } |
| } |
| |
| if (needs_console) { |
| setsid(); |
| open_console(); |
| } else { |
| zap_stdio(); |
| } |
| |
| if (false) { |
| for (size_t n = 0; svc->args[n]; n++) { |
| INFO("args[%zu] = '%s'\n", n, svc->args[n]); |
| } |
| for (size_t n = 0; ENV[n]; n++) { |
| INFO("env[%zu] = '%s'\n", n, ENV[n]); |
| } |
| } |
| |
| setpgid(0, getpid()); |
| |
| // As requested, set our gid, supplemental gids, and uid. |
| if (svc->gid) { |
| if (setgid(svc->gid) != 0) { |
| ERROR("setgid failed: %s\n", strerror(errno)); |
| _exit(127); |
| } |
| } |
| if (svc->nr_supp_gids) { |
| if (setgroups(svc->nr_supp_gids, svc->supp_gids) != 0) { |
| ERROR("setgroups failed: %s\n", strerror(errno)); |
| _exit(127); |
| } |
| } |
| if (svc->uid) { |
| if (setuid(svc->uid) != 0) { |
| ERROR("setuid failed: %s\n", strerror(errno)); |
| _exit(127); |
| } |
| } |
| if (svc->seclabel) { |
| if (is_selinux_enabled() > 0 && setexeccon(svc->seclabel) < 0) { |
| ERROR("cannot setexeccon('%s'): %s\n", svc->seclabel, strerror(errno)); |
| _exit(127); |
| } |
| } |
| |
| if (!dynamic_args) { |
| if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) { |
| ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno)); |
| } |
| } else { |
| char *arg_ptrs[INIT_PARSER_MAXARGS+1]; |
| int arg_idx = svc->nargs; |
| char *tmp = strdup(dynamic_args); |
| char *next = tmp; |
| char *bword; |
| |
| /* Copy the static arguments */ |
| memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *))); |
| |
| while((bword = strsep(&next, " "))) { |
| arg_ptrs[arg_idx++] = bword; |
| if (arg_idx == INIT_PARSER_MAXARGS) |
| break; |
| } |
| arg_ptrs[arg_idx] = NULL; |
| execve(svc->args[0], (char**) arg_ptrs, (char**) ENV); |
| } |
| _exit(127); |
| } |
| |
| freecon(scon); |
| |
| if (pid < 0) { |
| ERROR("failed to start '%s'\n", svc->name); |
| svc->pid = 0; |
| return; |
| } |
| |
| svc->time_started = gettime(); |
| svc->pid = pid; |
| svc->flags |= SVC_RUNNING; |
| |
| if ((svc->flags & SVC_EXEC) != 0) { |
| INFO("SVC_EXEC pid %d (uid %d gid %d+%zu context %s) started; waiting...\n", |
| svc->pid, svc->uid, svc->gid, svc->nr_supp_gids, |
| svc->seclabel ? : "default"); |
| waiting_for_exec = true; |
| } |
| |
| svc->NotifyStateChange("running"); |
| } |
| |
| /* The how field should be either SVC_DISABLED, SVC_RESET, or SVC_RESTART */ |
| static void service_stop_or_reset(struct service *svc, int how) |
| { |
| /* The service is still SVC_RUNNING until its process exits, but if it has |
| * already exited it shoudn't attempt a restart yet. */ |
| svc->flags &= ~(SVC_RESTARTING | SVC_DISABLED_START); |
| |
| if ((how != SVC_DISABLED) && (how != SVC_RESET) && (how != SVC_RESTART)) { |
| /* Hrm, an illegal flag. Default to SVC_DISABLED */ |
| how = SVC_DISABLED; |
| } |
| /* if the service has not yet started, prevent |
| * it from auto-starting with its class |
| */ |
| if (how == SVC_RESET) { |
| svc->flags |= (svc->flags & SVC_RC_DISABLED) ? SVC_DISABLED : SVC_RESET; |
| } else { |
| svc->flags |= how; |
| } |
| |
| if (svc->pid) { |
| NOTICE("Service '%s' is being killed...\n", svc->name); |
| kill(-svc->pid, SIGKILL); |
| svc->NotifyStateChange("stopping"); |
| } else { |
| svc->NotifyStateChange("stopped"); |
| } |
| } |
| |
| void service_reset(struct service *svc) |
| { |
| service_stop_or_reset(svc, SVC_RESET); |
| } |
| |
| void service_stop(struct service *svc) |
| { |
| service_stop_or_reset(svc, SVC_DISABLED); |
| } |
| |
| void service_restart(struct service *svc) |
| { |
| if (svc->flags & SVC_RUNNING) { |
| /* Stop, wait, then start the service. */ |
| service_stop_or_reset(svc, SVC_RESTART); |
| } else if (!(svc->flags & SVC_RESTARTING)) { |
| /* Just start the service since it's not running. */ |
| service_start(svc, NULL); |
| } /* else: Service is restarting anyways. */ |
| } |
| |
| void property_changed(const char *name, const char *value) |
| { |
| if (property_triggers_enabled) |
| queue_property_triggers(name, value); |
| } |
| |
| static void restart_service_if_needed(struct service *svc) |
| { |
| time_t next_start_time = svc->time_started + 5; |
| |
| if (next_start_time <= gettime()) { |
| svc->flags &= (~SVC_RESTARTING); |
| service_start(svc, NULL); |
| return; |
| } |
| |
| if ((next_start_time < process_needs_restart) || |
| (process_needs_restart == 0)) { |
| process_needs_restart = next_start_time; |
| } |
| } |
| |
| static void restart_processes() |
| { |
| process_needs_restart = 0; |
| service_for_each_flags(SVC_RESTARTING, |
| restart_service_if_needed); |
| } |
| |
| static void msg_start(const char *name) |
| { |
| struct service *svc = NULL; |
| char *tmp = NULL; |
| char *args = NULL; |
| |
| if (!strchr(name, ':')) |
| svc = service_find_by_name(name); |
| else { |
| tmp = strdup(name); |
| if (tmp) { |
| args = strchr(tmp, ':'); |
| *args = '\0'; |
| args++; |
| |
| svc = service_find_by_name(tmp); |
| } |
| } |
| |
| if (svc) { |
| service_start(svc, args); |
| } else { |
| ERROR("no such service '%s'\n", name); |
| } |
| if (tmp) |
| free(tmp); |
| } |
| |
| static void msg_stop(const char *name) |
| { |
| struct service *svc = service_find_by_name(name); |
| |
| if (svc) { |
| service_stop(svc); |
| } else { |
| ERROR("no such service '%s'\n", name); |
| } |
| } |
| |
| static void msg_restart(const char *name) |
| { |
| struct service *svc = service_find_by_name(name); |
| |
| if (svc) { |
| service_restart(svc); |
| } else { |
| ERROR("no such service '%s'\n", name); |
| } |
| } |
| |
| void handle_control_message(const char *msg, const char *arg) |
| { |
| if (!strcmp(msg,"start")) { |
| msg_start(arg); |
| } else if (!strcmp(msg,"stop")) { |
| msg_stop(arg); |
| } else if (!strcmp(msg,"restart")) { |
| msg_restart(arg); |
| } else { |
| ERROR("unknown control msg '%s'\n", msg); |
| } |
| } |
| |
| static struct command *get_first_command(struct action *act) |
| { |
| struct listnode *node; |
| node = list_head(&act->commands); |
| if (!node || list_empty(&act->commands)) |
| return NULL; |
| |
| return node_to_item(node, struct command, clist); |
| } |
| |
| static struct command *get_next_command(struct action *act, struct command *cmd) |
| { |
| struct listnode *node; |
| node = cmd->clist.next; |
| if (!node) |
| return NULL; |
| if (node == &act->commands) |
| return NULL; |
| |
| return node_to_item(node, struct command, clist); |
| } |
| |
| static int is_last_command(struct action *act, struct command *cmd) |
| { |
| return (list_tail(&act->commands) == &cmd->clist); |
| } |
| |
| |
| void build_triggers_string(char *name_str, int length, struct action *cur_action) { |
| struct listnode *node; |
| struct trigger *cur_trigger; |
| |
| list_for_each(node, &cur_action->triggers) { |
| cur_trigger = node_to_item(node, struct trigger, nlist); |
| if (node != cur_action->triggers.next) { |
| strlcat(name_str, " " , length); |
| } |
| strlcat(name_str, cur_trigger->name , length); |
| } |
| } |
| |
| void execute_one_command() { |
| Timer t; |
| |
| char cmd_str[256] = ""; |
| char name_str[256] = ""; |
| |
| if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) { |
| cur_action = action_remove_queue_head(); |
| cur_command = NULL; |
| if (!cur_action) { |
| return; |
| } |
| |
| build_triggers_string(name_str, sizeof(name_str), cur_action); |
| |
| INFO("processing action %p (%s)\n", cur_action, name_str); |
| cur_command = get_first_command(cur_action); |
| } else { |
| cur_command = get_next_command(cur_action, cur_command); |
| } |
| |
| if (!cur_command) { |
| return; |
| } |
| |
| int result = cur_command->func(cur_command->nargs, cur_command->args); |
| if (klog_get_level() >= KLOG_INFO_LEVEL) { |
| for (int i = 0; i < cur_command->nargs; i++) { |
| strlcat(cmd_str, cur_command->args[i], sizeof(cmd_str)); |
| if (i < cur_command->nargs - 1) { |
| strlcat(cmd_str, " ", sizeof(cmd_str)); |
| } |
| } |
| char source[256]; |
| if (cur_command->filename) { |
| snprintf(source, sizeof(source), " (%s:%d)", cur_command->filename, cur_command->line); |
| } else { |
| *source = '\0'; |
| } |
| INFO("Command '%s' action=%s%s returned %d took %.2fs\n", |
| cmd_str, cur_action ? name_str : "", source, result, t.duration()); |
| } |
| } |
| |
| static int wait_for_coldboot_done_action(int nargs, char **args) { |
| Timer t; |
| |
| NOTICE("Waiting for %s...\n", COLDBOOT_DONE); |
| // Any longer than 1s is an unreasonable length of time to delay booting. |
| // If you're hitting this timeout, check that you didn't make your |
| // sepolicy regular expressions too expensive (http://b/19899875). |
| if (wait_for_file(COLDBOOT_DONE, 1)) { |
| ERROR("Timed out waiting for %s\n", COLDBOOT_DONE); |
| } |
| |
| NOTICE("Waiting for %s took %.2fs.\n", COLDBOOT_DONE, t.duration()); |
| return 0; |
| } |
| |
| /* |
| * Writes 512 bytes of output from Hardware RNG (/dev/hw_random, backed |
| * by Linux kernel's hw_random framework) into Linux RNG's via /dev/urandom. |
| * Does nothing if Hardware RNG is not present. |
| * |
| * Since we don't yet trust the quality of Hardware RNG, these bytes are not |
| * mixed into the primary pool of Linux RNG and the entropy estimate is left |
| * unmodified. |
| * |
| * If the HW RNG device /dev/hw_random is present, we require that at least |
| * 512 bytes read from it are written into Linux RNG. QA is expected to catch |
| * devices/configurations where these I/O operations are blocking for a long |
| * time. We do not reboot or halt on failures, as this is a best-effort |
| * attempt. |
| */ |
| static int mix_hwrng_into_linux_rng_action(int nargs, char **args) |
| { |
| int result = -1; |
| int hwrandom_fd = -1; |
| int urandom_fd = -1; |
| char buf[512]; |
| ssize_t chunk_size; |
| size_t total_bytes_written = 0; |
| |
| hwrandom_fd = TEMP_FAILURE_RETRY( |
| open("/dev/hw_random", O_RDONLY | O_NOFOLLOW | O_CLOEXEC)); |
| if (hwrandom_fd == -1) { |
| if (errno == ENOENT) { |
| ERROR("/dev/hw_random not found\n"); |
| /* It's not an error to not have a Hardware RNG. */ |
| result = 0; |
| } else { |
| ERROR("Failed to open /dev/hw_random: %s\n", strerror(errno)); |
| } |
| goto ret; |
| } |
| |
| urandom_fd = TEMP_FAILURE_RETRY( |
| open("/dev/urandom", O_WRONLY | O_NOFOLLOW | O_CLOEXEC)); |
| if (urandom_fd == -1) { |
| ERROR("Failed to open /dev/urandom: %s\n", strerror(errno)); |
| goto ret; |
| } |
| |
| while (total_bytes_written < sizeof(buf)) { |
| chunk_size = TEMP_FAILURE_RETRY( |
| read(hwrandom_fd, buf, sizeof(buf) - total_bytes_written)); |
| if (chunk_size == -1) { |
| ERROR("Failed to read from /dev/hw_random: %s\n", strerror(errno)); |
| goto ret; |
| } else if (chunk_size == 0) { |
| ERROR("Failed to read from /dev/hw_random: EOF\n"); |
| goto ret; |
| } |
| |
| chunk_size = TEMP_FAILURE_RETRY(write(urandom_fd, buf, chunk_size)); |
| if (chunk_size == -1) { |
| ERROR("Failed to write to /dev/urandom: %s\n", strerror(errno)); |
| goto ret; |
| } |
| total_bytes_written += chunk_size; |
| } |
| |
| INFO("Mixed %zu bytes from /dev/hw_random into /dev/urandom", |
| total_bytes_written); |
| result = 0; |
| |
| ret: |
| if (hwrandom_fd != -1) { |
| close(hwrandom_fd); |
| } |
| if (urandom_fd != -1) { |
| close(urandom_fd); |
| } |
| return result; |
| } |
| |
| static int keychord_init_action(int nargs, char **args) |
| { |
| keychord_init(); |
| return 0; |
| } |
| |
| static int console_init_action(int nargs, char **args) |
| { |
| char console[PROP_VALUE_MAX]; |
| if (property_get("ro.boot.console", console) > 0) { |
| snprintf(console_name, sizeof(console_name), "/dev/%s", console); |
| } |
| |
| int fd = open(console_name, O_RDWR | O_CLOEXEC); |
| if (fd >= 0) |
| have_console = 1; |
| close(fd); |
| |
| fd = open("/dev/tty0", O_WRONLY | O_CLOEXEC); |
| if (fd >= 0) { |
| const char *msg; |
| msg = "\n" |
| "\n" |
| "\n" |
| "\n" |
| "\n" |
| "\n" |
| "\n" // console is 40 cols x 30 lines |
| "\n" |
| "\n" |
| "\n" |
| "\n" |
| "\n" |
| "\n" |
| "\n" |
| " A N D R O I D "; |
| write(fd, msg, strlen(msg)); |
| close(fd); |
| } |
| |
| return 0; |
| } |
| |
| static void import_kernel_nv(char *name, bool for_emulator) |
| { |
| char *value = strchr(name, '='); |
| int name_len = strlen(name); |
| |
| if (value == 0) return; |
| *value++ = 0; |
| if (name_len == 0) return; |
| |
| if (for_emulator) { |
| /* in the emulator, export any kernel option with the |
| * ro.kernel. prefix */ |
| char buff[PROP_NAME_MAX]; |
| int len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name ); |
| |
| if (len < (int)sizeof(buff)) |
| property_set( buff, value ); |
| return; |
| } |
| |
| if (!strcmp(name,"qemu")) { |
| strlcpy(qemu, value, sizeof(qemu)); |
| } else if (!strncmp(name, "androidboot.", 12) && name_len > 12) { |
| const char *boot_prop_name = name + 12; |
| char prop[PROP_NAME_MAX]; |
| int cnt; |
| |
| cnt = snprintf(prop, sizeof(prop), "ro.boot.%s", boot_prop_name); |
| if (cnt < PROP_NAME_MAX) |
| property_set(prop, value); |
| } |
| } |
| |
| static void export_kernel_boot_props() { |
| struct { |
| const char *src_prop; |
| const char *dst_prop; |
| const char *default_value; |
| } prop_map[] = { |
| { "ro.boot.serialno", "ro.serialno", "", }, |
| { "ro.boot.mode", "ro.bootmode", "unknown", }, |
| { "ro.boot.baseband", "ro.baseband", "unknown", }, |
| { "ro.boot.bootloader", "ro.bootloader", "unknown", }, |
| { "ro.boot.hardware", "ro.hardware", "unknown", }, |
| { "ro.boot.revision", "ro.revision", "0", }, |
| }; |
| for (size_t i = 0; i < ARRAY_SIZE(prop_map); i++) { |
| char value[PROP_VALUE_MAX]; |
| int rc = property_get(prop_map[i].src_prop, value); |
| property_set(prop_map[i].dst_prop, (rc > 0) ? value : prop_map[i].default_value); |
| } |
| } |
| |
| static void process_kernel_dt(void) |
| { |
| static const char android_dir[] = "/proc/device-tree/firmware/android"; |
| |
| std::string file_name = android::base::StringPrintf("%s/compatible", android_dir); |
| |
| std::string dt_file; |
| android::base::ReadFileToString(file_name, &dt_file); |
| if (!dt_file.compare("android,firmware")) { |
| ERROR("firmware/android is not compatible with 'android,firmware'\n"); |
| return; |
| } |
| |
| std::unique_ptr<DIR, int(*)(DIR*)>dir(opendir(android_dir), closedir); |
| if (!dir) |
| return; |
| |
| struct dirent *dp; |
| while ((dp = readdir(dir.get())) != NULL) { |
| if (dp->d_type != DT_REG || !strcmp(dp->d_name, "compatible")) |
| continue; |
| |
| file_name = android::base::StringPrintf("%s/%s", android_dir, dp->d_name); |
| |
| android::base::ReadFileToString(file_name, &dt_file); |
| std::replace(dt_file.begin(), dt_file.end(), ',', '.'); |
| |
| std::string property_name = android::base::StringPrintf("ro.boot.%s", dp->d_name); |
| property_set(property_name.c_str(), dt_file.c_str()); |
| } |
| } |
| |
| static void process_kernel_cmdline(void) |
| { |
| /* don't expose the raw commandline to nonpriv processes */ |
| chmod("/proc/cmdline", 0440); |
| |
| /* first pass does the common stuff, and finds if we are in qemu. |
| * second pass is only necessary for qemu to export all kernel params |
| * as props. |
| */ |
| import_kernel_cmdline(false, import_kernel_nv); |
| if (qemu[0]) |
| import_kernel_cmdline(true, import_kernel_nv); |
| } |
| |
| static int queue_property_triggers_action(int nargs, char **args) |
| { |
| queue_all_property_triggers(); |
| /* enable property triggers */ |
| property_triggers_enabled = 1; |
| return 0; |
| } |
| |
| static void selinux_init_all_handles(void) |
| { |
| sehandle = selinux_android_file_context_handle(); |
| selinux_android_set_sehandle(sehandle); |
| sehandle_prop = selinux_android_prop_context_handle(); |
| } |
| |
| enum selinux_enforcing_status { SELINUX_DISABLED, SELINUX_PERMISSIVE, SELINUX_ENFORCING }; |
| |
| static selinux_enforcing_status selinux_status_from_cmdline() { |
| selinux_enforcing_status status = SELINUX_ENFORCING; |
| |
| std::function<void(char*,bool)> fn = [&](char* name, bool in_qemu) { |
| char *value = strchr(name, '='); |
| if (value == nullptr) { return; } |
| *value++ = '\0'; |
| if (strcmp(name, "androidboot.selinux") == 0) { |
| if (strcmp(value, "disabled") == 0) { |
| status = SELINUX_DISABLED; |
| } else if (strcmp(value, "permissive") == 0) { |
| status = SELINUX_PERMISSIVE; |
| } |
| } |
| }; |
| import_kernel_cmdline(false, fn); |
| |
| return status; |
| } |
| |
| |
| static bool selinux_is_disabled(void) |
| { |
| if (ALLOW_DISABLE_SELINUX) { |
| if (access("/sys/fs/selinux", F_OK) != 0) { |
| // SELinux is not compiled into the kernel, or has been disabled |
| // via the kernel command line "selinux=0". |
| return true; |
| } |
| return selinux_status_from_cmdline() == SELINUX_DISABLED; |
| } |
| |
| return false; |
| } |
| |
| static bool selinux_is_enforcing(void) |
| { |
| if (ALLOW_DISABLE_SELINUX) { |
| return selinux_status_from_cmdline() == SELINUX_ENFORCING; |
| } |
| return true; |
| } |
| |
| int selinux_reload_policy(void) |
| { |
| if (selinux_is_disabled()) { |
| return -1; |
| } |
| |
| INFO("SELinux: Attempting to reload policy files\n"); |
| |
| if (selinux_android_reload_policy() == -1) { |
| return -1; |
| } |
| |
| if (sehandle) |
| selabel_close(sehandle); |
| |
| if (sehandle_prop) |
| selabel_close(sehandle_prop); |
| |
| selinux_init_all_handles(); |
| return 0; |
| } |
| |
| static int audit_callback(void *data, security_class_t /*cls*/, char *buf, size_t len) { |
| snprintf(buf, len, "property=%s", !data ? "NULL" : (char *)data); |
| return 0; |
| } |
| |
| static void security_failure() { |
| ERROR("Security failure; rebooting into recovery mode...\n"); |
| android_reboot(ANDROID_RB_RESTART2, 0, "recovery"); |
| while (true) { pause(); } // never reached |
| } |
| |
| static void selinux_initialize(bool in_kernel_domain) { |
| Timer t; |
| |
| selinux_callback cb; |
| cb.func_log = selinux_klog_callback; |
| selinux_set_callback(SELINUX_CB_LOG, cb); |
| cb.func_audit = audit_callback; |
| selinux_set_callback(SELINUX_CB_AUDIT, cb); |
| |
| if (selinux_is_disabled()) { |
| return; |
| } |
| |
| if (in_kernel_domain) { |
| INFO("Loading SELinux policy...\n"); |
| if (selinux_android_load_policy() < 0) { |
| ERROR("failed to load policy: %s\n", strerror(errno)); |
| security_failure(); |
| } |
| |
| bool is_enforcing = selinux_is_enforcing(); |
| security_setenforce(is_enforcing); |
| |
| if (write_file("/sys/fs/selinux/checkreqprot", "0") == -1) { |
| security_failure(); |
| } |
| |
| NOTICE("(Initializing SELinux %s took %.2fs.)\n", |
| is_enforcing ? "enforcing" : "non-enforcing", t.duration()); |
| } else { |
| selinux_init_all_handles(); |
| } |
| } |
| |
| int main(int argc, char** argv) { |
| if (!strcmp(basename(argv[0]), "ueventd")) { |
| return ueventd_main(argc, argv); |
| } |
| |
| if (!strcmp(basename(argv[0]), "watchdogd")) { |
| return watchdogd_main(argc, argv); |
| } |
| |
| // Clear the umask. |
| umask(0); |
| |
| add_environment("PATH", _PATH_DEFPATH); |
| |
| bool is_first_stage = (argc == 1) || (strcmp(argv[1], "--second-stage") != 0); |
| |
| // Get the basic filesystem setup we need put together in the initramdisk |
| // on / and then we'll let the rc file figure out the rest. |
| if (is_first_stage) { |
| mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755"); |
| mkdir("/dev/pts", 0755); |
| mkdir("/dev/socket", 0755); |
| mount("devpts", "/dev/pts", "devpts", 0, NULL); |
| mount("proc", "/proc", "proc", 0, NULL); |
| mount("sysfs", "/sys", "sysfs", 0, NULL); |
| } |
| |
| // We must have some place other than / to create the device nodes for |
| // kmsg and null, otherwise we won't be able to remount / read-only |
| // later on. Now that tmpfs is mounted on /dev, we can actually talk |
| // to the outside world. |
| open_devnull_stdio(); |
| klog_init(); |
| klog_set_level(KLOG_NOTICE_LEVEL); |
| |
| NOTICE("init%s started!\n", is_first_stage ? "" : " second stage"); |
| |
| if (!is_first_stage) { |
| // Indicate that booting is in progress to background fw loaders, etc. |
| close(open("/dev/.booting", O_WRONLY | O_CREAT | O_CLOEXEC, 0000)); |
| |
| property_init(); |
| |
| // If arguments are passed both on the command line and in DT, |
| // properties set in DT always have priority over the command-line ones. |
| process_kernel_dt(); |
| process_kernel_cmdline(); |
| |
| // Propogate the kernel variables to internal variables |
| // used by init as well as the current required properties. |
| export_kernel_boot_props(); |
| } |
| |
| // Set up SELinux, including loading the SELinux policy if we're in the kernel domain. |
| selinux_initialize(is_first_stage); |
| |
| // If we're in the kernel domain, re-exec init to transition to the init domain now |
| // that the SELinux policy has been loaded. |
| if (is_first_stage) { |
| if (restorecon("/init") == -1) { |
| ERROR("restorecon failed: %s\n", strerror(errno)); |
| security_failure(); |
| } |
| char* path = argv[0]; |
| char* args[] = { path, const_cast<char*>("--second-stage"), nullptr }; |
| if (execv(path, args) == -1) { |
| ERROR("execv(\"%s\") failed: %s\n", path, strerror(errno)); |
| security_failure(); |
| } |
| } |
| |
| // These directories were necessarily created before initial policy load |
| // and therefore need their security context restored to the proper value. |
| // This must happen before /dev is populated by ueventd. |
| INFO("Running restorecon...\n"); |
| restorecon("/dev"); |
| restorecon("/dev/socket"); |
| restorecon("/dev/__properties__"); |
| restorecon_recursive("/sys"); |
| |
| epoll_fd = epoll_create1(EPOLL_CLOEXEC); |
| if (epoll_fd == -1) { |
| ERROR("epoll_create1 failed: %s\n", strerror(errno)); |
| exit(1); |
| } |
| |
| signal_handler_init(); |
| |
| property_load_boot_defaults(); |
| start_property_service(); |
| |
| init_parse_config_file("/init.rc"); |
| |
| action_for_each_trigger("early-init", action_add_queue_tail); |
| |
| // Queue an action that waits for coldboot done so we know ueventd has set up all of /dev... |
| queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done"); |
| // ... so that we can start queuing up actions that require stuff from /dev. |
| queue_builtin_action(mix_hwrng_into_linux_rng_action, "mix_hwrng_into_linux_rng"); |
| queue_builtin_action(keychord_init_action, "keychord_init"); |
| queue_builtin_action(console_init_action, "console_init"); |
| |
| // Trigger all the boot actions to get us started. |
| action_for_each_trigger("init", action_add_queue_tail); |
| |
| // Repeat mix_hwrng_into_linux_rng in case /dev/hw_random or /dev/random |
| // wasn't ready immediately after wait_for_coldboot_done |
| queue_builtin_action(mix_hwrng_into_linux_rng_action, "mix_hwrng_into_linux_rng"); |
| |
| // Don't mount filesystems or start core system services in charger mode. |
| char bootmode[PROP_VALUE_MAX]; |
| if (property_get("ro.bootmode", bootmode) > 0 && strcmp(bootmode, "charger") == 0) { |
| action_for_each_trigger("charger", action_add_queue_tail); |
| } else { |
| action_for_each_trigger("late-init", action_add_queue_tail); |
| } |
| |
| // Run all property triggers based on current state of the properties. |
| queue_builtin_action(queue_property_triggers_action, "queue_property_triggers"); |
| |
| while (true) { |
| if (!waiting_for_exec) { |
| execute_one_command(); |
| restart_processes(); |
| } |
| |
| int timeout = -1; |
| if (process_needs_restart) { |
| timeout = (process_needs_restart - gettime()) * 1000; |
| if (timeout < 0) |
| timeout = 0; |
| } |
| |
| if (!action_queue_empty() || cur_action) { |
| timeout = 0; |
| } |
| |
| bootchart_sample(&timeout); |
| |
| epoll_event ev; |
| int nr = TEMP_FAILURE_RETRY(epoll_wait(epoll_fd, &ev, 1, timeout)); |
| if (nr == -1) { |
| ERROR("epoll_wait failed: %s\n", strerror(errno)); |
| } else if (nr == 1) { |
| ((void (*)()) ev.data.ptr)(); |
| } |
| } |
| |
| return 0; |
| } |