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 = LIST_HEAD_INIT(init_signals.posix_timers), 34 .cputimer = { 35 .cputime_atomic = INIT_CPUTIME_ATOMIC, 36 }, 37 #endif 38 INIT_CPU_TIMERS(init_signals) 39 .pids = { 40 [PIDTYPE_PID] = &init_struct_pid, 41 [PIDTYPE_TGID] = &init_struct_pid, 42 [PIDTYPE_PGID] = &init_struct_pid, 43 [PIDTYPE_SID] = &init_struct_pid, 44 }, 45 INIT_PREV_CPUTIME(init_signals) 46 }; 47 48 static struct sighand_struct init_sighand = { 49 .count = REFCOUNT_INIT(1), 50 .action = { { { .sa_handler = SIG_DFL, } }, }, 51 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock), 52 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh), 53 }; 54 55 #ifdef CONFIG_SHADOW_CALL_STACK 56 unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = { 57 [(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC 58 }; 59 #endif 60 61 /* 62 * Set up the first task table, touch at your own risk!. Base=0, 63 * limit=0x1fffff (=2MB) 64 */ 65 struct task_struct init_task __aligned(L1_CACHE_BYTES) = { 66 #ifdef CONFIG_THREAD_INFO_IN_TASK 67 .thread_info = INIT_THREAD_INFO(init_task), 68 .stack_refcount = REFCOUNT_INIT(1), 69 #endif 70 .__state = 0, 71 .stack = init_stack, 72 .usage = REFCOUNT_INIT(2), 73 .flags = PF_KTHREAD, 74 .prio = MAX_PRIO - 20, 75 .static_prio = MAX_PRIO - 20, 76 .normal_prio = MAX_PRIO - 20, 77 .policy = SCHED_NORMAL, 78 .cpus_ptr = &init_task.cpus_mask, 79 .user_cpus_ptr = NULL, 80 .cpus_mask = CPU_MASK_ALL, 81 .max_allowed_capacity = SCHED_CAPACITY_SCALE, 82 .nr_cpus_allowed= NR_CPUS, 83 .mm = NULL, 84 .active_mm = &init_mm, 85 .faults_disabled_mapping = NULL, 86 .restart_block = { 87 .fn = do_no_restart_syscall, 88 }, 89 .se = { 90 .group_node = LIST_HEAD_INIT(init_task.se.group_node), 91 }, 92 .rt = { 93 .run_list = LIST_HEAD_INIT(init_task.rt.run_list), 94 .time_slice = RR_TIMESLICE, 95 }, 96 .tasks = LIST_HEAD_INIT(init_task.tasks), 97 #ifdef CONFIG_SMP 98 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO), 99 #endif 100 #ifdef CONFIG_CGROUP_SCHED 101 .sched_task_group = &root_task_group, 102 #endif 103 #ifdef CONFIG_SCHED_CLASS_EXT 104 .scx = { 105 .dsq_node = LIST_HEAD_INIT(init_task.scx.dsq_node), 106 .sticky_cpu = -1, 107 .holding_cpu = -1, 108 .runnable_node = LIST_HEAD_INIT(init_task.scx.runnable_node), 109 .ddsp_dsq_id = SCX_DSQ_INVALID, 110 .slice = SCX_SLICE_DFL, 111 }, 112 #endif 113 .ptraced = LIST_HEAD_INIT(init_task.ptraced), 114 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry), 115 .real_parent = &init_task, 116 .parent = &init_task, 117 .children = LIST_HEAD_INIT(init_task.children), 118 .sibling = LIST_HEAD_INIT(init_task.sibling), 119 .group_leader = &init_task, 120 RCU_POINTER_INITIALIZER(real_cred, &init_cred), 121 RCU_POINTER_INITIALIZER(cred, &init_cred), 122 .comm = INIT_TASK_COMM, 123 .thread = INIT_THREAD, 124 .fs = &init_fs, 125 .files = &init_files, 126 #ifdef CONFIG_IO_URING 127 .io_uring = NULL, 128 #endif 129 .signal = &init_signals, 130 .sighand = &init_sighand, 131 .nsproxy = &init_nsproxy, 132 .pending = { 133 .list = LIST_HEAD_INIT(init_task.pending.list), 134 .signal = {{0}} 135 }, 136 .blocked = {{0}}, 137 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock), 138 .journal_info = NULL, 139 INIT_CPU_TIMERS(init_task) 140 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock), 141 .timer_slack_ns = 50000, /* 50 usec default slack */ 142 .thread_pid = &init_struct_pid, 143 .thread_node = LIST_HEAD_INIT(init_signals.thread_head), 144 #ifdef CONFIG_AUDIT 145 .loginuid = INVALID_UID, 146 .sessionid = AUDIT_SID_UNSET, 147 #endif 148 #ifdef CONFIG_PERF_EVENTS 149 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex), 150 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list), 151 #endif 152 #ifdef CONFIG_PREEMPT_RCU 153 .rcu_read_lock_nesting = 0, 154 .rcu_read_unlock_special.s = 0, 155 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry), 156 .rcu_blocked_node = NULL, 157 #endif 158 #ifdef CONFIG_TASKS_RCU 159 .rcu_tasks_holdout = false, 160 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list), 161 .rcu_tasks_idle_cpu = -1, 162 .rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list), 163 #endif 164 #ifdef CONFIG_TASKS_TRACE_RCU 165 .trc_reader_nesting = 0, 166 .trc_reader_special.s = 0, 167 .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list), 168 .trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node), 169 #endif 170 #ifdef CONFIG_CPUSETS 171 .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq, 172 &init_task.alloc_lock), 173 #endif 174 #ifdef CONFIG_RT_MUTEXES 175 .pi_waiters = RB_ROOT_CACHED, 176 .pi_top_task = NULL, 177 #endif 178 INIT_PREV_CPUTIME(init_task) 179 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 180 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount), 181 .vtime.starttime = 0, 182 .vtime.state = VTIME_SYS, 183 #endif 184 #ifdef CONFIG_NUMA_BALANCING 185 .numa_preferred_nid = NUMA_NO_NODE, 186 .numa_group = NULL, 187 .numa_faults = NULL, 188 #endif 189 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) 190 .kasan_depth = 1, 191 #endif 192 #ifdef CONFIG_KCSAN 193 .kcsan_ctx = { 194 .scoped_accesses = {LIST_POISON1, NULL}, 195 }, 196 #endif 197 #ifdef CONFIG_TRACE_IRQFLAGS 198 .softirqs_enabled = 1, 199 #endif 200 #ifdef CONFIG_LOCKDEP 201 .lockdep_depth = 0, /* no locks held yet */ 202 .curr_chain_key = INITIAL_CHAIN_KEY, 203 .lockdep_recursion = 0, 204 #endif 205 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 206 .ret_stack = NULL, 207 .tracing_graph_pause = ATOMIC_INIT(0), 208 #endif 209 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION) 210 .trace_recursion = 0, 211 #endif 212 #ifdef CONFIG_LIVEPATCH 213 .patch_state = KLP_TRANSITION_IDLE, 214 #endif 215 #ifdef CONFIG_SECURITY 216 .security = NULL, 217 #endif 218 #ifdef CONFIG_SECCOMP_FILTER 219 .seccomp = { .filter_count = ATOMIC_INIT(0) }, 220 #endif 221 }; 222 EXPORT_SYMBOL(init_task); 223 224 /* 225 * Initial thread structure. Alignment of this is handled by a special 226 * linker map entry. 227 */ 228 #ifndef CONFIG_THREAD_INFO_IN_TASK 229 struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task); 230 #endif 231