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 #ifdef CONFIG_CGROUPS 31 .cgroup_threadgroup_rwsem = __RWSEM_INITIALIZER(init_signals.cgroup_threadgroup_rwsem), 32 #endif 33 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex), 34 .exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock), 35 #ifdef CONFIG_POSIX_TIMERS 36 .posix_timers = HLIST_HEAD_INIT, 37 .ignored_posix_timers = HLIST_HEAD_INIT, 38 .cputimer = { 39 .cputime_atomic = INIT_CPUTIME_ATOMIC, 40 }, 41 #endif 42 INIT_CPU_TIMERS(init_signals) 43 .pids = { 44 [PIDTYPE_PID] = &init_struct_pid, 45 [PIDTYPE_TGID] = &init_struct_pid, 46 [PIDTYPE_PGID] = &init_struct_pid, 47 [PIDTYPE_SID] = &init_struct_pid, 48 }, 49 INIT_PREV_CPUTIME(init_signals) 50 }; 51 52 static struct sighand_struct init_sighand = { 53 .count = REFCOUNT_INIT(1), 54 .action = { { { .sa_handler = SIG_DFL, } }, }, 55 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock), 56 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh), 57 }; 58 59 #ifdef CONFIG_SHADOW_CALL_STACK 60 unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = { 61 [(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC 62 }; 63 #endif 64 65 /* 66 * Set up the first task table, touch at your own risk!. Base=0, 67 * limit=0x1fffff (=2MB) 68 */ 69 struct task_struct init_task __aligned(L1_CACHE_BYTES) = { 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 .user_cpus_ptr = NULL, 84 .cpus_mask = CPU_MASK_ALL, 85 .max_allowed_capacity = SCHED_CAPACITY_SCALE, 86 .nr_cpus_allowed= NR_CPUS, 87 .mm = NULL, 88 .active_mm = &init_mm, 89 .faults_disabled_mapping = NULL, 90 .restart_block = { 91 .fn = do_no_restart_syscall, 92 }, 93 .se = { 94 .group_node = LIST_HEAD_INIT(init_task.se.group_node), 95 }, 96 .rt = { 97 .run_list = LIST_HEAD_INIT(init_task.rt.run_list), 98 .time_slice = RR_TIMESLICE, 99 }, 100 .tasks = LIST_HEAD_INIT(init_task.tasks), 101 #ifdef CONFIG_SMP 102 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO), 103 #endif 104 #ifdef CONFIG_CGROUP_SCHED 105 .sched_task_group = &root_task_group, 106 #endif 107 #ifdef CONFIG_SCHED_CLASS_EXT 108 .scx = { 109 .dsq_list.node = LIST_HEAD_INIT(init_task.scx.dsq_list.node), 110 .sticky_cpu = -1, 111 .holding_cpu = -1, 112 .runnable_node = LIST_HEAD_INIT(init_task.scx.runnable_node), 113 .runnable_at = INITIAL_JIFFIES, 114 .ddsp_dsq_id = SCX_DSQ_INVALID, 115 .slice = SCX_SLICE_DFL, 116 }, 117 #endif 118 .ptraced = LIST_HEAD_INIT(init_task.ptraced), 119 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry), 120 .real_parent = &init_task, 121 .parent = &init_task, 122 .children = LIST_HEAD_INIT(init_task.children), 123 .sibling = LIST_HEAD_INIT(init_task.sibling), 124 .group_leader = &init_task, 125 RCU_POINTER_INITIALIZER(real_cred, &init_cred), 126 RCU_POINTER_INITIALIZER(cred, &init_cred), 127 .comm = INIT_TASK_COMM, 128 .thread = INIT_THREAD, 129 .fs = &init_fs, 130 .files = &init_files, 131 #ifdef CONFIG_IO_URING 132 .io_uring = NULL, 133 #endif 134 .signal = &init_signals, 135 .sighand = &init_sighand, 136 .nsproxy = &init_nsproxy, 137 .pending = { 138 .list = LIST_HEAD_INIT(init_task.pending.list), 139 .signal = {{0}} 140 }, 141 .blocked = {{0}}, 142 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock), 143 .journal_info = NULL, 144 INIT_CPU_TIMERS(init_task) 145 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock), 146 .timer_slack_ns = 50000, /* 50 usec default slack */ 147 .thread_pid = &init_struct_pid, 148 .thread_node = LIST_HEAD_INIT(init_signals.thread_head), 149 #ifdef CONFIG_AUDIT 150 .loginuid = INVALID_UID, 151 .sessionid = AUDIT_SID_UNSET, 152 #endif 153 #ifdef CONFIG_PERF_EVENTS 154 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex), 155 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list), 156 #endif 157 #ifdef CONFIG_PREEMPT_RCU 158 .rcu_read_lock_nesting = 0, 159 .rcu_read_unlock_special.s = 0, 160 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry), 161 .rcu_blocked_node = NULL, 162 #endif 163 #ifdef CONFIG_TASKS_RCU 164 .rcu_tasks_holdout = false, 165 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list), 166 .rcu_tasks_idle_cpu = -1, 167 .rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list), 168 #endif 169 #ifdef CONFIG_TASKS_TRACE_RCU 170 .trc_reader_nesting = 0, 171 .trc_reader_special.s = 0, 172 .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list), 173 .trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node), 174 #endif 175 #ifdef CONFIG_CPUSETS 176 .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq, 177 &init_task.alloc_lock), 178 #endif 179 #ifdef CONFIG_RT_MUTEXES 180 .pi_waiters = RB_ROOT_CACHED, 181 .pi_top_task = NULL, 182 #endif 183 INIT_PREV_CPUTIME(init_task) 184 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 185 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount), 186 .vtime.starttime = 0, 187 .vtime.state = VTIME_SYS, 188 #endif 189 #ifdef CONFIG_NUMA_BALANCING 190 .numa_preferred_nid = NUMA_NO_NODE, 191 .numa_group = NULL, 192 .numa_faults = NULL, 193 #endif 194 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) 195 .kasan_depth = 1, 196 #endif 197 #ifdef CONFIG_KCSAN 198 .kcsan_ctx = { 199 .scoped_accesses = {LIST_POISON1, NULL}, 200 }, 201 #endif 202 #ifdef CONFIG_TRACE_IRQFLAGS 203 .softirqs_enabled = 1, 204 #endif 205 #ifdef CONFIG_LOCKDEP 206 .lockdep_depth = 0, /* no locks held yet */ 207 .curr_chain_key = INITIAL_CHAIN_KEY, 208 .lockdep_recursion = 0, 209 #endif 210 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 211 .ret_stack = NULL, 212 .tracing_graph_pause = ATOMIC_INIT(0), 213 #endif 214 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION) 215 .trace_recursion = 0, 216 #endif 217 #ifdef CONFIG_LIVEPATCH 218 .patch_state = KLP_TRANSITION_IDLE, 219 #endif 220 #ifdef CONFIG_SECURITY 221 .security = NULL, 222 #endif 223 #ifdef CONFIG_SECCOMP_FILTER 224 .seccomp = { .filter_count = ATOMIC_INIT(0) }, 225 #endif 226 }; 227 EXPORT_SYMBOL(init_task); 228 229 /* 230 * Initial thread structure. Alignment of this is handled by a special 231 * linker map entry. 232 */ 233 #ifndef CONFIG_THREAD_INFO_IN_TASK 234 struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task); 235 #endif 236