init_task.c (6224B)
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 18static 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 46static 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 54unsigned 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 */ 64struct 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 .restart_block = { 89 .fn = do_no_restart_syscall, 90 }, 91 .se = { 92 .group_node = LIST_HEAD_INIT(init_task.se.group_node), 93 }, 94 .rt = { 95 .run_list = LIST_HEAD_INIT(init_task.rt.run_list), 96 .time_slice = RR_TIMESLICE, 97 }, 98 .tasks = LIST_HEAD_INIT(init_task.tasks), 99#ifdef CONFIG_SMP 100 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO), 101#endif 102#ifdef CONFIG_CGROUP_SCHED 103 .sched_task_group = &root_task_group, 104#endif 105 .ptraced = LIST_HEAD_INIT(init_task.ptraced), 106 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry), 107 .real_parent = &init_task, 108 .parent = &init_task, 109 .children = LIST_HEAD_INIT(init_task.children), 110 .sibling = LIST_HEAD_INIT(init_task.sibling), 111 .group_leader = &init_task, 112 RCU_POINTER_INITIALIZER(real_cred, &init_cred), 113 RCU_POINTER_INITIALIZER(cred, &init_cred), 114 .comm = INIT_TASK_COMM, 115 .thread = INIT_THREAD, 116 .fs = &init_fs, 117 .files = &init_files, 118#ifdef CONFIG_IO_URING 119 .io_uring = NULL, 120#endif 121 .signal = &init_signals, 122 .sighand = &init_sighand, 123 .nsproxy = &init_nsproxy, 124 .pending = { 125 .list = LIST_HEAD_INIT(init_task.pending.list), 126 .signal = {{0}} 127 }, 128 .blocked = {{0}}, 129 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock), 130 .journal_info = NULL, 131 INIT_CPU_TIMERS(init_task) 132 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock), 133 .timer_slack_ns = 50000, /* 50 usec default slack */ 134 .thread_pid = &init_struct_pid, 135 .thread_group = LIST_HEAD_INIT(init_task.thread_group), 136 .thread_node = LIST_HEAD_INIT(init_signals.thread_head), 137#ifdef CONFIG_AUDIT 138 .loginuid = INVALID_UID, 139 .sessionid = AUDIT_SID_UNSET, 140#endif 141#ifdef CONFIG_PERF_EVENTS 142 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex), 143 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list), 144#endif 145#ifdef CONFIG_PREEMPT_RCU 146 .rcu_read_lock_nesting = 0, 147 .rcu_read_unlock_special.s = 0, 148 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry), 149 .rcu_blocked_node = NULL, 150#endif 151#ifdef CONFIG_TASKS_RCU 152 .rcu_tasks_holdout = false, 153 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list), 154 .rcu_tasks_idle_cpu = -1, 155#endif 156#ifdef CONFIG_TASKS_TRACE_RCU 157 .trc_reader_nesting = 0, 158 .trc_reader_special.s = 0, 159 .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list), 160#endif 161#ifdef CONFIG_CPUSETS 162 .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq, 163 &init_task.alloc_lock), 164#endif 165#ifdef CONFIG_RT_MUTEXES 166 .pi_waiters = RB_ROOT_CACHED, 167 .pi_top_task = NULL, 168#endif 169 INIT_PREV_CPUTIME(init_task) 170#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 171 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount), 172 .vtime.starttime = 0, 173 .vtime.state = VTIME_SYS, 174#endif 175#ifdef CONFIG_NUMA_BALANCING 176 .numa_preferred_nid = NUMA_NO_NODE, 177 .numa_group = NULL, 178 .numa_faults = NULL, 179#endif 180#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) 181 .kasan_depth = 1, 182#endif 183#ifdef CONFIG_KCSAN 184 .kcsan_ctx = { 185 .scoped_accesses = {LIST_POISON1, NULL}, 186 }, 187#endif 188#ifdef CONFIG_TRACE_IRQFLAGS 189 .softirqs_enabled = 1, 190#endif 191#ifdef CONFIG_LOCKDEP 192 .lockdep_depth = 0, /* no locks held yet */ 193 .curr_chain_key = INITIAL_CHAIN_KEY, 194 .lockdep_recursion = 0, 195#endif 196#ifdef CONFIG_FUNCTION_GRAPH_TRACER 197 .ret_stack = NULL, 198 .tracing_graph_pause = ATOMIC_INIT(0), 199#endif 200#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION) 201 .trace_recursion = 0, 202#endif 203#ifdef CONFIG_LIVEPATCH 204 .patch_state = KLP_UNDEFINED, 205#endif 206#ifdef CONFIG_SECURITY 207 .security = NULL, 208#endif 209#ifdef CONFIG_SECCOMP_FILTER 210 .seccomp = { .filter_count = ATOMIC_INIT(0) }, 211#endif 212}; 213EXPORT_SYMBOL(init_task); 214 215/* 216 * Initial thread structure. Alignment of this is handled by a special 217 * linker map entry. 218 */ 219#ifndef CONFIG_THREAD_INFO_IN_TASK 220struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task); 221#endif