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