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 #include <linux/scs.h> 15 #include <linux/plist.h> 16 17 #include <linux/uaccess.h> 18 19 static struct signal_struct init_signals = { 20 .nr_threads = 1, 21 .thread_head = LIST_HEAD_INIT(init_task.thread_node), 22 .wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit), 23 .shared_pending = { 24 .list = LIST_HEAD_INIT(init_signals.shared_pending.list), 25 .signal = {{0}} 26 }, 27 .multiprocess = HLIST_HEAD_INIT, 28 .rlim = INIT_RLIMITS, 29 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex), 30 .exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock), 31 #ifdef CONFIG_POSIX_TIMERS 32 .posix_timers = LIST_HEAD_INIT(init_signals.posix_timers), 33 .cputimer = { 34 .cputime_atomic = INIT_CPUTIME_ATOMIC, 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 #ifdef CONFIG_SHADOW_CALL_STACK 55 unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = { 56 [(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC 57 }; 58 #endif 59 60 /* 61 * Set up the first task table, touch at your own risk!. Base=0, 62 * limit=0x1fffff (=2MB) 63 */ 64 struct task_struct init_task __aligned(L1_CACHE_BYTES) = { 65 #ifdef CONFIG_THREAD_INFO_IN_TASK 66 .thread_info = INIT_THREAD_INFO(init_task), 67 .stack_refcount = REFCOUNT_INIT(1), 68 #endif 69 .__state = 0, 70 .stack = init_stack, 71 .usage = REFCOUNT_INIT(2), 72 .flags = PF_KTHREAD, 73 .prio = MAX_PRIO - 20, 74 .static_prio = MAX_PRIO - 20, 75 .normal_prio = MAX_PRIO - 20, 76 .policy = SCHED_NORMAL, 77 .cpus_ptr = &init_task.cpus_mask, 78 .user_cpus_ptr = NULL, 79 .cpus_mask = CPU_MASK_ALL, 80 .max_allowed_capacity = SCHED_CAPACITY_SCALE, 81 .nr_cpus_allowed= NR_CPUS, 82 .mm = NULL, 83 .active_mm = &init_mm, 84 .faults_disabled_mapping = NULL, 85 .restart_block = { 86 .fn = do_no_restart_syscall, 87 }, 88 .se = { 89 .group_node = LIST_HEAD_INIT(init_task.se.group_node), 90 }, 91 .rt = { 92 .run_list = LIST_HEAD_INIT(init_task.rt.run_list), 93 .time_slice = RR_TIMESLICE, 94 }, 95 .tasks = LIST_HEAD_INIT(init_task.tasks), 96 #ifdef CONFIG_SMP 97 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO), 98 #endif 99 #ifdef CONFIG_CGROUP_SCHED 100 .sched_task_group = &root_task_group, 101 #endif 102 .ptraced = LIST_HEAD_INIT(init_task.ptraced), 103 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry), 104 .real_parent = &init_task, 105 .parent = &init_task, 106 .children = LIST_HEAD_INIT(init_task.children), 107 .sibling = LIST_HEAD_INIT(init_task.sibling), 108 .group_leader = &init_task, 109 RCU_POINTER_INITIALIZER(real_cred, &init_cred), 110 RCU_POINTER_INITIALIZER(cred, &init_cred), 111 .comm = INIT_TASK_COMM, 112 .thread = INIT_THREAD, 113 .fs = &init_fs, 114 .files = &init_files, 115 #ifdef CONFIG_IO_URING 116 .io_uring = NULL, 117 #endif 118 .signal = &init_signals, 119 .sighand = &init_sighand, 120 .nsproxy = &init_nsproxy, 121 .pending = { 122 .list = LIST_HEAD_INIT(init_task.pending.list), 123 .signal = {{0}} 124 }, 125 .blocked = {{0}}, 126 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock), 127 .journal_info = NULL, 128 INIT_CPU_TIMERS(init_task) 129 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock), 130 .timer_slack_ns = 50000, /* 50 usec default slack */ 131 .thread_pid = &init_struct_pid, 132 .thread_node = LIST_HEAD_INIT(init_signals.thread_head), 133 #ifdef CONFIG_AUDIT 134 .loginuid = INVALID_UID, 135 .sessionid = AUDIT_SID_UNSET, 136 #endif 137 #ifdef CONFIG_PERF_EVENTS 138 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex), 139 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list), 140 #endif 141 #ifdef CONFIG_PREEMPT_RCU 142 .rcu_read_lock_nesting = 0, 143 .rcu_read_unlock_special.s = 0, 144 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry), 145 .rcu_blocked_node = NULL, 146 #endif 147 #ifdef CONFIG_TASKS_RCU 148 .rcu_tasks_holdout = false, 149 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list), 150 .rcu_tasks_idle_cpu = -1, 151 .rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list), 152 #endif 153 #ifdef CONFIG_TASKS_TRACE_RCU 154 .trc_reader_nesting = 0, 155 .trc_reader_special.s = 0, 156 .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list), 157 .trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node), 158 #endif 159 #ifdef CONFIG_CPUSETS 160 .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq, 161 &init_task.alloc_lock), 162 #endif 163 #ifdef CONFIG_RT_MUTEXES 164 .pi_waiters = RB_ROOT_CACHED, 165 .pi_top_task = NULL, 166 #endif 167 INIT_PREV_CPUTIME(init_task) 168 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 169 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount), 170 .vtime.starttime = 0, 171 .vtime.state = VTIME_SYS, 172 #endif 173 #ifdef CONFIG_NUMA_BALANCING 174 .numa_preferred_nid = NUMA_NO_NODE, 175 .numa_group = NULL, 176 .numa_faults = NULL, 177 #endif 178 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) 179 .kasan_depth = 1, 180 #endif 181 #ifdef CONFIG_KCSAN 182 .kcsan_ctx = { 183 .scoped_accesses = {LIST_POISON1, NULL}, 184 }, 185 #endif 186 #ifdef CONFIG_TRACE_IRQFLAGS 187 .softirqs_enabled = 1, 188 #endif 189 #ifdef CONFIG_LOCKDEP 190 .lockdep_depth = 0, /* no locks held yet */ 191 .curr_chain_key = INITIAL_CHAIN_KEY, 192 .lockdep_recursion = 0, 193 #endif 194 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 195 .ret_stack = NULL, 196 .tracing_graph_pause = ATOMIC_INIT(0), 197 #endif 198 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION) 199 .trace_recursion = 0, 200 #endif 201 #ifdef CONFIG_LIVEPATCH 202 .patch_state = KLP_TRANSITION_IDLE, 203 #endif 204 #ifdef CONFIG_SECURITY 205 .security = NULL, 206 #endif 207 #ifdef CONFIG_SECCOMP_FILTER 208 .seccomp = { .filter_count = ATOMIC_INIT(0) }, 209 #endif 210 }; 211 EXPORT_SYMBOL(init_task); 212 213 /* 214 * Initial thread structure. Alignment of this is handled by a special 215 * linker map entry. 216 */ 217 #ifndef CONFIG_THREAD_INFO_IN_TASK 218 struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task); 219 #endif 220