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