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/sched/ext.h> 10 #include <linux/init.h> 11 #include <linux/fs.h> 12 #include <linux/mm.h> 13 #include <linux/audit.h> 14 #include <linux/numa.h> 15 #include <linux/scs.h> 16 #include <linux/plist.h> 17 18 #include <linux/uaccess.h> 19 20 static struct signal_struct init_signals = { 21 .nr_threads = 1, 22 .thread_head = LIST_HEAD_INIT(init_task.thread_node), 23 .wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit), 24 .shared_pending = { 25 .list = LIST_HEAD_INIT(init_signals.shared_pending.list), 26 .signal = {{0}} 27 }, 28 .multiprocess = HLIST_HEAD_INIT, 29 .rlim = INIT_RLIMITS, 30 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex), 31 .exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock), 32 #ifdef CONFIG_POSIX_TIMERS 33 .posix_timers = HLIST_HEAD_INIT, 34 .ignored_posix_timers = HLIST_HEAD_INIT, 35 .cputimer = { 36 .cputime_atomic = INIT_CPUTIME_ATOMIC, 37 }, 38 #endif 39 INIT_CPU_TIMERS(init_signals) 40 .pids = { 41 [PIDTYPE_PID] = &init_struct_pid, 42 [PIDTYPE_TGID] = &init_struct_pid, 43 [PIDTYPE_PGID] = &init_struct_pid, 44 [PIDTYPE_SID] = &init_struct_pid, 45 }, 46 INIT_PREV_CPUTIME(init_signals) 47 }; 48 49 static struct sighand_struct init_sighand = { 50 .count = REFCOUNT_INIT(1), 51 .action = { { { .sa_handler = SIG_DFL, } }, }, 52 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock), 53 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh), 54 }; 55 56 #ifdef CONFIG_SHADOW_CALL_STACK 57 unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = { 58 [(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC 59 }; 60 #endif 61 62 /* 63 * Set up the first task table, touch at your own risk!. Base=0, 64 * limit=0x1fffff (=2MB) 65 */ 66 struct task_struct init_task __aligned(L1_CACHE_BYTES) = { 67 #ifdef CONFIG_THREAD_INFO_IN_TASK 68 .thread_info = INIT_THREAD_INFO(init_task), 69 .stack_refcount = REFCOUNT_INIT(1), 70 #endif 71 .__state = 0, 72 .stack = init_stack, 73 .usage = REFCOUNT_INIT(2), 74 .flags = PF_KTHREAD, 75 .prio = MAX_PRIO - 20, 76 .static_prio = MAX_PRIO - 20, 77 .normal_prio = MAX_PRIO - 20, 78 .policy = SCHED_NORMAL, 79 .cpus_ptr = &init_task.cpus_mask, 80 .user_cpus_ptr = NULL, 81 .cpus_mask = CPU_MASK_ALL, 82 .max_allowed_capacity = SCHED_CAPACITY_SCALE, 83 .nr_cpus_allowed= NR_CPUS, 84 .mm = NULL, 85 .active_mm = &init_mm, 86 .faults_disabled_mapping = NULL, 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 #ifdef CONFIG_SCHED_CLASS_EXT 105 .scx = { 106 .dsq_list.node = LIST_HEAD_INIT(init_task.scx.dsq_list.node), 107 .sticky_cpu = -1, 108 .holding_cpu = -1, 109 .runnable_node = LIST_HEAD_INIT(init_task.scx.runnable_node), 110 .runnable_at = INITIAL_JIFFIES, 111 .ddsp_dsq_id = SCX_DSQ_INVALID, 112 .slice = SCX_SLICE_DFL, 113 }, 114 #endif 115 .ptraced = LIST_HEAD_INIT(init_task.ptraced), 116 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry), 117 .real_parent = &init_task, 118 .parent = &init_task, 119 .children = LIST_HEAD_INIT(init_task.children), 120 .sibling = LIST_HEAD_INIT(init_task.sibling), 121 .group_leader = &init_task, 122 RCU_POINTER_INITIALIZER(real_cred, &init_cred), 123 RCU_POINTER_INITIALIZER(cred, &init_cred), 124 .comm = INIT_TASK_COMM, 125 .thread = INIT_THREAD, 126 .fs = &init_fs, 127 .files = &init_files, 128 #ifdef CONFIG_IO_URING 129 .io_uring = NULL, 130 #endif 131 .signal = &init_signals, 132 .sighand = &init_sighand, 133 .nsproxy = &init_nsproxy, 134 .pending = { 135 .list = LIST_HEAD_INIT(init_task.pending.list), 136 .signal = {{0}} 137 }, 138 .blocked = {{0}}, 139 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock), 140 .journal_info = NULL, 141 INIT_CPU_TIMERS(init_task) 142 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock), 143 .timer_slack_ns = 50000, /* 50 usec default slack */ 144 .thread_pid = &init_struct_pid, 145 .thread_node = LIST_HEAD_INIT(init_signals.thread_head), 146 #ifdef CONFIG_AUDIT 147 .loginuid = INVALID_UID, 148 .sessionid = AUDIT_SID_UNSET, 149 #endif 150 #ifdef CONFIG_PERF_EVENTS 151 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex), 152 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list), 153 #endif 154 #ifdef CONFIG_PREEMPT_RCU 155 .rcu_read_lock_nesting = 0, 156 .rcu_read_unlock_special.s = 0, 157 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry), 158 .rcu_blocked_node = NULL, 159 #endif 160 #ifdef CONFIG_TASKS_RCU 161 .rcu_tasks_holdout = false, 162 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list), 163 .rcu_tasks_idle_cpu = -1, 164 .rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list), 165 #endif 166 #ifdef CONFIG_TASKS_TRACE_RCU 167 .trc_reader_nesting = 0, 168 .trc_reader_special.s = 0, 169 .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list), 170 .trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node), 171 #endif 172 #ifdef CONFIG_CPUSETS 173 .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq, 174 &init_task.alloc_lock), 175 #endif 176 #ifdef CONFIG_RT_MUTEXES 177 .pi_waiters = RB_ROOT_CACHED, 178 .pi_top_task = NULL, 179 #endif 180 INIT_PREV_CPUTIME(init_task) 181 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 182 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount), 183 .vtime.starttime = 0, 184 .vtime.state = VTIME_SYS, 185 #endif 186 #ifdef CONFIG_NUMA_BALANCING 187 .numa_preferred_nid = NUMA_NO_NODE, 188 .numa_group = NULL, 189 .numa_faults = NULL, 190 #endif 191 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) 192 .kasan_depth = 1, 193 #endif 194 #ifdef CONFIG_KCSAN 195 .kcsan_ctx = { 196 .scoped_accesses = {LIST_POISON1, NULL}, 197 }, 198 #endif 199 #ifdef CONFIG_TRACE_IRQFLAGS 200 .softirqs_enabled = 1, 201 #endif 202 #ifdef CONFIG_LOCKDEP 203 .lockdep_depth = 0, /* no locks held yet */ 204 .curr_chain_key = INITIAL_CHAIN_KEY, 205 .lockdep_recursion = 0, 206 #endif 207 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 208 .ret_stack = NULL, 209 .tracing_graph_pause = ATOMIC_INIT(0), 210 #endif 211 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION) 212 .trace_recursion = 0, 213 #endif 214 #ifdef CONFIG_LIVEPATCH 215 .patch_state = KLP_TRANSITION_IDLE, 216 #endif 217 #ifdef CONFIG_SECURITY 218 .security = NULL, 219 #endif 220 #ifdef CONFIG_SECCOMP_FILTER 221 .seccomp = { .filter_count = ATOMIC_INIT(0) }, 222 #endif 223 }; 224 EXPORT_SYMBOL(init_task); 225 226 /* 227 * Initial thread structure. Alignment of this is handled by a special 228 * linker map entry. 229 */ 230 #ifndef CONFIG_THREAD_INFO_IN_TASK 231 struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task); 232 #endif 233