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