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 }, 34 #endif 35 INIT_CPU_TIMERS(init_signals) 36 .pids = { 37 [PIDTYPE_PID] = &init_struct_pid, 38 [PIDTYPE_TGID] = &init_struct_pid, 39 [PIDTYPE_PGID] = &init_struct_pid, 40 [PIDTYPE_SID] = &init_struct_pid, 41 }, 42 INIT_PREV_CPUTIME(init_signals) 43 }; 44 45 static struct sighand_struct init_sighand = { 46 .count = REFCOUNT_INIT(1), 47 .action = { { { .sa_handler = SIG_DFL, } }, }, 48 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock), 49 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh), 50 }; 51 52 /* 53 * Set up the first task table, touch at your own risk!. Base=0, 54 * limit=0x1fffff (=2MB) 55 */ 56 struct task_struct init_task 57 #ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK 58 __init_task_data 59 #endif 60 = { 61 #ifdef CONFIG_THREAD_INFO_IN_TASK 62 .thread_info = INIT_THREAD_INFO(init_task), 63 .stack_refcount = REFCOUNT_INIT(1), 64 #endif 65 .state = 0, 66 .stack = init_stack, 67 .usage = REFCOUNT_INIT(2), 68 .flags = PF_KTHREAD, 69 .prio = MAX_PRIO - 20, 70 .static_prio = MAX_PRIO - 20, 71 .normal_prio = MAX_PRIO - 20, 72 .policy = SCHED_NORMAL, 73 .cpus_ptr = &init_task.cpus_mask, 74 .cpus_mask = 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_AUDIT 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 = NUMA_NO_NODE, 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_depth = 0, /* no locks held yet */ 169 .curr_chain_key = INITIAL_CHAIN_KEY, 170 .lockdep_recursion = 0, 171 #endif 172 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 173 .ret_stack = NULL, 174 #endif 175 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION) 176 .trace_recursion = 0, 177 #endif 178 #ifdef CONFIG_LIVEPATCH 179 .patch_state = KLP_UNDEFINED, 180 #endif 181 #ifdef CONFIG_SECURITY 182 .security = NULL, 183 #endif 184 }; 185 EXPORT_SYMBOL(init_task); 186 187 /* 188 * Initial thread structure. Alignment of this is handled by a special 189 * linker map entry. 190 */ 191 #ifndef CONFIG_THREAD_INFO_IN_TASK 192 struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task); 193 #endif 194