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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/init/init_task.c
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// SPDX-License-Identifier: GPL-2.0

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#include <linux/init_task.h>

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#include <linux/export.h>

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#include <linux/mqueue.h>

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#include <linux/sched.h>

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#include <linux/sched/sysctl.h>

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#include <linux/sched/rt.h>

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#include <linux/sched/task.h>

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#include <linux/sched/ext.h>

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#include <linux/init.h>

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#include <linux/fs.h>

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#include <linux/mm.h>

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#include <linux/audit.h>

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#include <linux/numa.h>

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#include <linux/scs.h>

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#include <linux/plist.h>

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#include <linux/uaccess.h>

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static struct signal_struct init_signals = {

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	.nr_threads	= 1,

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	.thread_head	= LIST_HEAD_INIT(init_task.thread_node),

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	.wait_chldexit	= __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),

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	.shared_pending	= {

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		.list = LIST_HEAD_INIT(init_signals.shared_pending.list),

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		.signal =  {{0}}

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	},

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	.multiprocess	= HLIST_HEAD_INIT,

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	.rlim		= INIT_RLIMITS,

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#ifdef CONFIG_CGROUPS

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	.cgroup_threadgroup_rwsem	= __RWSEM_INITIALIZER(init_signals.cgroup_threadgroup_rwsem),

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#endif

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	.cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),

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	.exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),

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#ifdef CONFIG_POSIX_TIMERS

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	.posix_timers		= HLIST_HEAD_INIT,

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	.ignored_posix_timers	= HLIST_HEAD_INIT,

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	.cputimer		= {

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		.cputime_atomic	= INIT_CPUTIME_ATOMIC,

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	},

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#endif

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	INIT_CPU_TIMERS(init_signals)

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	.pids = {

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		[PIDTYPE_PID]	= &init_struct_pid,

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		[PIDTYPE_TGID]	= &init_struct_pid,

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		[PIDTYPE_PGID]	= &init_struct_pid,

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		[PIDTYPE_SID]	= &init_struct_pid,

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	},

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	INIT_PREV_CPUTIME(init_signals)

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};

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static struct sighand_struct init_sighand = {

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	.count		= REFCOUNT_INIT(1),

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	.action		= { { { .sa_handler = SIG_DFL, } }, },

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	.siglock	= __SPIN_LOCK_UNLOCKED(init_sighand.siglock),

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	.signalfd_wqh	= __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),

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};

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#ifdef CONFIG_SHADOW_CALL_STACK

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unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = {

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	[(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC

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};

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#endif

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/* init to 2 - one for init_task, one to ensure it is never freed */

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static struct group_info init_groups = { .usage = REFCOUNT_INIT(2) };

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/*

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 * The initial credentials for the initial task

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 */

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static struct cred init_cred = {

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	.usage			= ATOMIC_INIT(4),

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	.uid			= GLOBAL_ROOT_UID,

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	.gid			= GLOBAL_ROOT_GID,

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	.suid			= GLOBAL_ROOT_UID,

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	.sgid			= GLOBAL_ROOT_GID,

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	.euid			= GLOBAL_ROOT_UID,

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	.egid			= GLOBAL_ROOT_GID,

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	.fsuid			= GLOBAL_ROOT_UID,

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	.fsgid			= GLOBAL_ROOT_GID,

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	.securebits		= SECUREBITS_DEFAULT,

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	.cap_inheritable	= CAP_EMPTY_SET,

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	.cap_permitted		= CAP_FULL_SET,

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	.cap_effective		= CAP_FULL_SET,

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	.cap_bset		= CAP_FULL_SET,

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	.user			= INIT_USER,

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	.user_ns		= &init_user_ns,

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	.group_info		= &init_groups,

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	.ucounts		= &init_ucounts,

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};

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/*

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 * Set up the first task table, touch at your own risk!. Base=0,

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 * limit=0x1fffff (=2MB)

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 */

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struct task_struct init_task __aligned(L1_CACHE_BYTES) = {

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#ifdef CONFIG_THREAD_INFO_IN_TASK

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	.thread_info	= INIT_THREAD_INFO(init_task),

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	.stack_refcount	= REFCOUNT_INIT(1),

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#endif

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	.__state	= 0,

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	.stack		= init_stack,

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	.usage		= REFCOUNT_INIT(2),

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	.flags		= PF_KTHREAD,

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	.prio		= MAX_PRIO - 20,

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	.static_prio	= MAX_PRIO - 20,

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	.normal_prio	= MAX_PRIO - 20,

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	.policy		= SCHED_NORMAL,

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	.cpus_ptr	= &init_task.cpus_mask,

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	.user_cpus_ptr	= NULL,

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	.cpus_mask	= CPU_MASK_ALL,

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	.max_allowed_capacity	= SCHED_CAPACITY_SCALE,

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	.nr_cpus_allowed= NR_CPUS,

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	.mm		= NULL,

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	.active_mm	= &init_mm,

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	.faults_disabled_mapping = NULL,

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	.restart_block	= {

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		.fn = do_no_restart_syscall,

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	},

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	.se		= {

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		.group_node 	= LIST_HEAD_INIT(init_task.se.group_node),

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	},

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	.rt		= {

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		.run_list	= LIST_HEAD_INIT(init_task.rt.run_list),

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		.time_slice	= RR_TIMESLICE,

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	},

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	.tasks		= LIST_HEAD_INIT(init_task.tasks),

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#ifdef CONFIG_SMP

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	.pushable_tasks	= PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),

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#endif

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#ifdef CONFIG_CGROUP_SCHED

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	.sched_task_group = &root_task_group,

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#endif

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#ifdef CONFIG_SCHED_CLASS_EXT

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	.scx		= {

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		.dsq_list.node	= LIST_HEAD_INIT(init_task.scx.dsq_list.node),

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		.sticky_cpu	= -1,

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		.holding_cpu	= -1,

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		.runnable_node	= LIST_HEAD_INIT(init_task.scx.runnable_node),

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		.runnable_at	= INITIAL_JIFFIES,

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		.ddsp_dsq_id	= SCX_DSQ_INVALID,

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		.slice		= SCX_SLICE_DFL,

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	},

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#endif

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	.ptraced	= LIST_HEAD_INIT(init_task.ptraced),

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	.ptrace_entry	= LIST_HEAD_INIT(init_task.ptrace_entry),

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	.real_parent	= &init_task,

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	.parent		= &init_task,

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	.children	= LIST_HEAD_INIT(init_task.children),

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	.sibling	= LIST_HEAD_INIT(init_task.sibling),

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	.group_leader	= &init_task,

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	RCU_POINTER_INITIALIZER(real_cred, &init_cred),

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	RCU_POINTER_INITIALIZER(cred, &init_cred),

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	.comm		= INIT_TASK_COMM,

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	.thread		= INIT_THREAD,

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	.fs		= &init_fs,

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	.files		= &init_files,

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#ifdef CONFIG_IO_URING

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	.io_uring	= NULL,

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#endif

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	.signal		= &init_signals,

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	.sighand	= &init_sighand,

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	.nsproxy	= &init_nsproxy,

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	.pending	= {

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		.list = LIST_HEAD_INIT(init_task.pending.list),

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		.signal = {{0}}

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	},

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	.blocked	= {{0}},

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	.alloc_lock	= __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),

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	.journal_info	= NULL,

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	INIT_CPU_TIMERS(init_task)

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	.pi_lock	= __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),

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	.timer_slack_ns = 50000, /* 50 usec default slack */

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	.thread_pid	= &init_struct_pid,

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	.thread_node	= LIST_HEAD_INIT(init_signals.thread_head),

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#ifdef CONFIG_AUDIT

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	.loginuid	= INVALID_UID,

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	.sessionid	= AUDIT_SID_UNSET,

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#endif

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#ifdef CONFIG_PERF_EVENTS

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	.perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),

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	.perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),

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#endif

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#ifdef CONFIG_PREEMPT_RCU

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	.rcu_read_lock_nesting = 0,

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	.rcu_read_unlock_special.s = 0,

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	.rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),

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	.rcu_blocked_node = NULL,

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#endif

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#ifdef CONFIG_TASKS_RCU

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	.rcu_tasks_holdout = false,

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	.rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),

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	.rcu_tasks_idle_cpu = -1,

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	.rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list),

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#endif

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#ifdef CONFIG_TASKS_TRACE_RCU

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	.trc_reader_nesting = 0,

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	.trc_reader_special.s = 0,

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	.trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list),

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	.trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node),

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#endif

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#ifdef CONFIG_CPUSETS

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	.mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,

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						 &init_task.alloc_lock),

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#endif

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#ifdef CONFIG_RT_MUTEXES

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	.pi_waiters	= RB_ROOT_CACHED,

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	.pi_top_task	= NULL,

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#endif

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	INIT_PREV_CPUTIME(init_task)

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#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN

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	.vtime.seqcount	= SEQCNT_ZERO(init_task.vtime_seqcount),

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	.vtime.starttime = 0,

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	.vtime.state	= VTIME_SYS,

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#endif

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#ifdef CONFIG_NUMA_BALANCING

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	.numa_preferred_nid = NUMA_NO_NODE,

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	.numa_group	= NULL,

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	.numa_faults	= NULL,

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#endif

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#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)

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	.kasan_depth	= 1,

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#endif

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#ifdef CONFIG_KCSAN

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	.kcsan_ctx = {

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		.scoped_accesses	= {LIST_POISON1, NULL},

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	},

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#endif

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#ifdef CONFIG_TRACE_IRQFLAGS

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	.softirqs_enabled = 1,

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#endif

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#ifdef CONFIG_LOCKDEP

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	.lockdep_depth = 0, /* no locks held yet */

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	.curr_chain_key = INITIAL_CHAIN_KEY,

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	.lockdep_recursion = 0,

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#endif

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#ifdef CONFIG_FUNCTION_GRAPH_TRACER

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	.ret_stack		= NULL,

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	.tracing_graph_pause	= ATOMIC_INIT(0),

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#endif

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#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)

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	.trace_recursion = 0,

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#endif

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#ifdef CONFIG_LIVEPATCH

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	.patch_state	= KLP_TRANSITION_IDLE,

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#endif

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#ifdef CONFIG_SECURITY

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	.security	= NULL,

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#endif

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#ifdef CONFIG_SECCOMP_FILTER

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	.seccomp	= { .filter_count = ATOMIC_INIT(0) },

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#endif

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#ifdef CONFIG_SCHED_MM_CID

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	.mm_cid		= { .cid = MM_CID_UNSET, },

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#endif

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};

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EXPORT_SYMBOL(init_task);

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/*

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 * Initial thread structure. Alignment of this is handled by a special

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 * linker map entry.

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 */

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#ifndef CONFIG_THREAD_INFO_IN_TASK

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struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);

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#endif

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