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