1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/init_task.h> 3 #include <linux/export.h> 4 #include <linux/mqueue.h> 5 #include <linux/sched.h> 6 #include <linux/sched/sysctl.h> 7 #include <linux/sched/rt.h> 8 #include <linux/sched/task.h> 9 #include <linux/init.h> 10 #include <linux/fs.h> 11 #include <linux/mm.h> 12 #include <linux/audit.h> 13 #include <linux/numa.h> 14 15 #include <asm/pgtable.h> 16 #include <linux/uaccess.h> 17 18 static struct signal_struct init_signals = { 19 .nr_threads = 1, 20 .thread_head = LIST_HEAD_INIT(init_task.thread_node), 21 .wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit), 22 .shared_pending = { 23 .list = LIST_HEAD_INIT(init_signals.shared_pending.list), 24 .signal = {{0}} 25 }, 26 .multiprocess = HLIST_HEAD_INIT, 27 .rlim = INIT_RLIMITS, 28 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex), 29 #ifdef CONFIG_POSIX_TIMERS 30 .posix_timers = LIST_HEAD_INIT(init_signals.posix_timers), 31 .cputimer = { 32 .cputime_atomic = INIT_CPUTIME_ATOMIC, 33 .running = false, 34 .checking_timer = false, 35 }, 36 #endif 37 INIT_CPU_TIMERS(init_signals) 38 .pids = { 39 [PIDTYPE_PID] = &init_struct_pid, 40 [PIDTYPE_TGID] = &init_struct_pid, 41 [PIDTYPE_PGID] = &init_struct_pid, 42 [PIDTYPE_SID] = &init_struct_pid, 43 }, 44 INIT_PREV_CPUTIME(init_signals) 45 }; 46 47 static struct sighand_struct init_sighand = { 48 .count = REFCOUNT_INIT(1), 49 .action = { { { .sa_handler = SIG_DFL, } }, }, 50 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock), 51 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh), 52 }; 53 54 /* 55 * Set up the first task table, touch at your own risk!. Base=0, 56 * limit=0x1fffff (=2MB) 57 */ 58 struct task_struct init_task 59 #ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK 60 __init_task_data 61 #endif 62 = { 63 #ifdef CONFIG_THREAD_INFO_IN_TASK 64 .thread_info = INIT_THREAD_INFO(init_task), 65 .stack_refcount = REFCOUNT_INIT(1), 66 #endif 67 .state = 0, 68 .stack = init_stack, 69 .usage = REFCOUNT_INIT(2), 70 .flags = PF_KTHREAD, 71 .prio = MAX_PRIO - 20, 72 .static_prio = MAX_PRIO - 20, 73 .normal_prio = MAX_PRIO - 20, 74 .policy = SCHED_NORMAL, 75 .cpus_allowed = CPU_MASK_ALL, 76 .nr_cpus_allowed= NR_CPUS, 77 .mm = NULL, 78 .active_mm = &init_mm, 79 .restart_block = { 80 .fn = do_no_restart_syscall, 81 }, 82 .se = { 83 .group_node = LIST_HEAD_INIT(init_task.se.group_node), 84 }, 85 .rt = { 86 .run_list = LIST_HEAD_INIT(init_task.rt.run_list), 87 .time_slice = RR_TIMESLICE, 88 }, 89 .tasks = LIST_HEAD_INIT(init_task.tasks), 90 #ifdef CONFIG_SMP 91 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO), 92 #endif 93 #ifdef CONFIG_CGROUP_SCHED 94 .sched_task_group = &root_task_group, 95 #endif 96 .ptraced = LIST_HEAD_INIT(init_task.ptraced), 97 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry), 98 .real_parent = &init_task, 99 .parent = &init_task, 100 .children = LIST_HEAD_INIT(init_task.children), 101 .sibling = LIST_HEAD_INIT(init_task.sibling), 102 .group_leader = &init_task, 103 RCU_POINTER_INITIALIZER(real_cred, &init_cred), 104 RCU_POINTER_INITIALIZER(cred, &init_cred), 105 .comm = INIT_TASK_COMM, 106 .thread = INIT_THREAD, 107 .fs = &init_fs, 108 .files = &init_files, 109 .signal = &init_signals, 110 .sighand = &init_sighand, 111 .nsproxy = &init_nsproxy, 112 .pending = { 113 .list = LIST_HEAD_INIT(init_task.pending.list), 114 .signal = {{0}} 115 }, 116 .blocked = {{0}}, 117 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock), 118 .journal_info = NULL, 119 INIT_CPU_TIMERS(init_task) 120 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock), 121 .timer_slack_ns = 50000, /* 50 usec default slack */ 122 .thread_pid = &init_struct_pid, 123 .thread_group = LIST_HEAD_INIT(init_task.thread_group), 124 .thread_node = LIST_HEAD_INIT(init_signals.thread_head), 125 #ifdef CONFIG_AUDIT 126 .loginuid = INVALID_UID, 127 .sessionid = AUDIT_SID_UNSET, 128 #endif 129 #ifdef CONFIG_PERF_EVENTS 130 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex), 131 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list), 132 #endif 133 #ifdef CONFIG_PREEMPT_RCU 134 .rcu_read_lock_nesting = 0, 135 .rcu_read_unlock_special.s = 0, 136 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry), 137 .rcu_blocked_node = NULL, 138 #endif 139 #ifdef CONFIG_TASKS_RCU 140 .rcu_tasks_holdout = false, 141 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list), 142 .rcu_tasks_idle_cpu = -1, 143 #endif 144 #ifdef CONFIG_CPUSETS 145 .mems_allowed_seq = SEQCNT_ZERO(init_task.mems_allowed_seq), 146 #endif 147 #ifdef CONFIG_RT_MUTEXES 148 .pi_waiters = RB_ROOT_CACHED, 149 .pi_top_task = NULL, 150 #endif 151 INIT_PREV_CPUTIME(init_task) 152 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 153 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount), 154 .vtime.starttime = 0, 155 .vtime.state = VTIME_SYS, 156 #endif 157 #ifdef CONFIG_NUMA_BALANCING 158 .numa_preferred_nid = NUMA_NO_NODE, 159 .numa_group = NULL, 160 .numa_faults = NULL, 161 #endif 162 #ifdef CONFIG_KASAN 163 .kasan_depth = 1, 164 #endif 165 #ifdef CONFIG_TRACE_IRQFLAGS 166 .softirqs_enabled = 1, 167 #endif 168 #ifdef CONFIG_LOCKDEP 169 .lockdep_recursion = 0, 170 #endif 171 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 172 .ret_stack = NULL, 173 #endif 174 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT) 175 .trace_recursion = 0, 176 #endif 177 #ifdef CONFIG_LIVEPATCH 178 .patch_state = KLP_UNDEFINED, 179 #endif 180 #ifdef CONFIG_SECURITY 181 .security = NULL, 182 #endif 183 }; 184 EXPORT_SYMBOL(init_task); 185 186 /* 187 * Initial thread structure. Alignment of this is handled by a special 188 * linker map entry. 189 */ 190 #ifndef CONFIG_THREAD_INFO_IN_TASK 191 struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task); 192 #endif 193