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 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 .exec_update_mutex = __MUTEX_INITIALIZER(init_signals.exec_update_mutex), 30 #ifdef CONFIG_POSIX_TIMERS 31 .posix_timers = LIST_HEAD_INIT(init_signals.posix_timers), 32 .cputimer = { 33 .cputime_atomic = INIT_CPUTIME_ATOMIC, 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 = REFCOUNT_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 #ifdef CONFIG_SHADOW_CALL_STACK 54 unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] 55 __init_task_data = { 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 65 #ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK 66 __init_task_data 67 #endif 68 __aligned(L1_CACHE_BYTES) 69 = { 70 #ifdef CONFIG_THREAD_INFO_IN_TASK 71 .thread_info = INIT_THREAD_INFO(init_task), 72 .stack_refcount = REFCOUNT_INIT(1), 73 #endif 74 .state = 0, 75 .stack = init_stack, 76 .usage = REFCOUNT_INIT(2), 77 .flags = PF_KTHREAD, 78 .prio = MAX_PRIO - 20, 79 .static_prio = MAX_PRIO - 20, 80 .normal_prio = MAX_PRIO - 20, 81 .policy = SCHED_NORMAL, 82 .cpus_ptr = &init_task.cpus_mask, 83 .cpus_mask = CPU_MASK_ALL, 84 .nr_cpus_allowed= NR_CPUS, 85 .mm = NULL, 86 .active_mm = &init_mm, 87 .restart_block = { 88 .fn = do_no_restart_syscall, 89 }, 90 .se = { 91 .group_node = LIST_HEAD_INIT(init_task.se.group_node), 92 }, 93 .rt = { 94 .run_list = LIST_HEAD_INIT(init_task.rt.run_list), 95 .time_slice = RR_TIMESLICE, 96 }, 97 .tasks = LIST_HEAD_INIT(init_task.tasks), 98 #ifdef CONFIG_SMP 99 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO), 100 #endif 101 #ifdef CONFIG_CGROUP_SCHED 102 .sched_task_group = &root_task_group, 103 #endif 104 .ptraced = LIST_HEAD_INIT(init_task.ptraced), 105 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry), 106 .real_parent = &init_task, 107 .parent = &init_task, 108 .children = LIST_HEAD_INIT(init_task.children), 109 .sibling = LIST_HEAD_INIT(init_task.sibling), 110 .group_leader = &init_task, 111 RCU_POINTER_INITIALIZER(real_cred, &init_cred), 112 RCU_POINTER_INITIALIZER(cred, &init_cred), 113 .comm = INIT_TASK_COMM, 114 .thread = INIT_THREAD, 115 .fs = &init_fs, 116 .files = &init_files, 117 #ifdef CONFIG_IO_URING 118 .io_uring = NULL, 119 #endif 120 .signal = &init_signals, 121 .sighand = &init_sighand, 122 .nsproxy = &init_nsproxy, 123 .pending = { 124 .list = LIST_HEAD_INIT(init_task.pending.list), 125 .signal = {{0}} 126 }, 127 .blocked = {{0}}, 128 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock), 129 .journal_info = NULL, 130 INIT_CPU_TIMERS(init_task) 131 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock), 132 .timer_slack_ns = 50000, /* 50 usec default slack */ 133 .thread_pid = &init_struct_pid, 134 .thread_group = LIST_HEAD_INIT(init_task.thread_group), 135 .thread_node = LIST_HEAD_INIT(init_signals.thread_head), 136 #ifdef CONFIG_AUDIT 137 .loginuid = INVALID_UID, 138 .sessionid = AUDIT_SID_UNSET, 139 #endif 140 #ifdef CONFIG_PERF_EVENTS 141 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex), 142 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list), 143 #endif 144 #ifdef CONFIG_PREEMPT_RCU 145 .rcu_read_lock_nesting = 0, 146 .rcu_read_unlock_special.s = 0, 147 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry), 148 .rcu_blocked_node = NULL, 149 #endif 150 #ifdef CONFIG_TASKS_RCU 151 .rcu_tasks_holdout = false, 152 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list), 153 .rcu_tasks_idle_cpu = -1, 154 #endif 155 #ifdef CONFIG_TASKS_TRACE_RCU 156 .trc_reader_nesting = 0, 157 .trc_reader_special.s = 0, 158 .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list), 159 #endif 160 #ifdef CONFIG_CPUSETS 161 .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq, 162 &init_task.alloc_lock), 163 #endif 164 #ifdef CONFIG_RT_MUTEXES 165 .pi_waiters = RB_ROOT_CACHED, 166 .pi_top_task = NULL, 167 #endif 168 INIT_PREV_CPUTIME(init_task) 169 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 170 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount), 171 .vtime.starttime = 0, 172 .vtime.state = VTIME_SYS, 173 #endif 174 #ifdef CONFIG_NUMA_BALANCING 175 .numa_preferred_nid = NUMA_NO_NODE, 176 .numa_group = NULL, 177 .numa_faults = NULL, 178 #endif 179 #ifdef CONFIG_KASAN 180 .kasan_depth = 1, 181 #endif 182 #ifdef CONFIG_KCSAN 183 .kcsan_ctx = { 184 .disable_count = 0, 185 .atomic_next = 0, 186 .atomic_nest_count = 0, 187 .in_flat_atomic = false, 188 .access_mask = 0, 189 .scoped_accesses = {LIST_POISON1, NULL}, 190 }, 191 #endif 192 #ifdef CONFIG_TRACE_IRQFLAGS 193 .softirqs_enabled = 1, 194 #endif 195 #ifdef CONFIG_LOCKDEP 196 .lockdep_depth = 0, /* no locks held yet */ 197 .curr_chain_key = INITIAL_CHAIN_KEY, 198 .lockdep_recursion = 0, 199 #endif 200 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 201 .ret_stack = NULL, 202 #endif 203 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION) 204 .trace_recursion = 0, 205 #endif 206 #ifdef CONFIG_LIVEPATCH 207 .patch_state = KLP_UNDEFINED, 208 #endif 209 #ifdef CONFIG_SECURITY 210 .security = NULL, 211 #endif 212 #ifdef CONFIG_SECCOMP 213 .seccomp = { .filter_count = ATOMIC_INIT(0) }, 214 #endif 215 }; 216 EXPORT_SYMBOL(init_task); 217 218 /* 219 * Initial thread structure. Alignment of this is handled by a special 220 * linker map entry. 221 */ 222 #ifndef CONFIG_THREAD_INFO_IN_TASK 223 struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task); 224 #endif 225