linux/init/init_task.c at wasm · tombl/linux

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// SPDX-License-Identifier: GPL-2.0

#include <linux/init_task.h>

#include <linux/export.h>

#include <linux/mqueue.h>

#include <linux/sched.h>

#include <linux/sched/sysctl.h>

#include <linux/sched/rt.h>

#include <linux/sched/task.h>

#include <linux/sched/ext.h>

#include <linux/init.h>

#include <linux/fs.h>

#include <linux/mm.h>

#include <linux/audit.h>

#include <linux/numa.h>

#include <linux/scs.h>

#include <linux/plist.h>

#include <linux/uaccess.h>

static struct signal_struct init_signals = {

.nr_threads = 1,

.thread_head = LIST_HEAD_INIT(init_task.thread_node),

.wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),

.shared_pending = {

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

.signal = {{0}}

.multiprocess = HLIST_HEAD_INIT,

.rlim = INIT_RLIMITS,

#ifdef CONFIG_CGROUPS

.cgroup_threadgroup_rwsem = __RWSEM_INITIALIZER(init_signals.cgroup_threadgroup_rwsem),

#endif

.cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),

.exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),

#ifdef CONFIG_POSIX_TIMERS

.posix_timers = HLIST_HEAD_INIT,

.ignored_posix_timers = HLIST_HEAD_INIT,

.cputimer = {

.cputime_atomic = INIT_CPUTIME_ATOMIC,

#endif

INIT_CPU_TIMERS(init_signals)

.pids = {

[PIDTYPE_PID] = &init_struct_pid,

[PIDTYPE_TGID] = &init_struct_pid,

[PIDTYPE_PGID] = &init_struct_pid,

[PIDTYPE_SID] = &init_struct_pid,

INIT_PREV_CPUTIME(init_signals)

};

static struct sighand_struct init_sighand = {

.count = REFCOUNT_INIT(1),

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

.siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),

.signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),

};

#ifdef CONFIG_SHADOW_CALL_STACK

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

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

};

#endif

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

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

* The initial credentials for the initial task

static struct cred init_cred = {

.usage = ATOMIC_INIT(4),

.uid = GLOBAL_ROOT_UID,

.gid = GLOBAL_ROOT_GID,

.suid = GLOBAL_ROOT_UID,

.sgid = GLOBAL_ROOT_GID,

.euid = GLOBAL_ROOT_UID,

.egid = GLOBAL_ROOT_GID,

.fsuid = GLOBAL_ROOT_UID,

.fsgid = GLOBAL_ROOT_GID,

.securebits = SECUREBITS_DEFAULT,

.cap_inheritable = CAP_EMPTY_SET,

.cap_permitted = CAP_FULL_SET,

.cap_effective = CAP_FULL_SET,

.cap_bset = CAP_FULL_SET,

.user = INIT_USER,

.user_ns = &init_user_ns,

.group_info = &init_groups,

.ucounts = &init_ucounts,

};

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

* limit=0x1fffff (=2MB)

struct task_struct init_task __aligned(L1_CACHE_BYTES) = {

#ifdef CONFIG_THREAD_INFO_IN_TASK

.thread_info = INIT_THREAD_INFO(init_task),

.stack_refcount = REFCOUNT_INIT(1),

#endif

.__state = 0,

.stack = init_stack,

.usage = REFCOUNT_INIT(2),

.flags = PF_KTHREAD,

.prio = MAX_PRIO - 20,

.static_prio = MAX_PRIO - 20,

.normal_prio = MAX_PRIO - 20,

.policy = SCHED_NORMAL,

.cpus_ptr = &init_task.cpus_mask,

.user_cpus_ptr = NULL,

.cpus_mask = CPU_MASK_ALL,

.max_allowed_capacity = SCHED_CAPACITY_SCALE,

.nr_cpus_allowed= NR_CPUS,

.mm = NULL,

.active_mm = &init_mm,

.restart_block = {

.fn = do_no_restart_syscall,

.se = {

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

.rt = {

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

.time_slice = RR_TIMESLICE,

.tasks = LIST_HEAD_INIT(init_task.tasks),

#ifdef CONFIG_SMP

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

#endif

#ifdef CONFIG_CGROUP_SCHED

.sched_task_group = &root_task_group,

#endif

#ifdef CONFIG_SCHED_CLASS_EXT

.scx = {

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

.sticky_cpu = -1,

.holding_cpu = -1,

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

.runnable_at = INITIAL_JIFFIES,

.ddsp_dsq_id = SCX_DSQ_INVALID,

.slice = SCX_SLICE_DFL,

#endif

.ptraced = LIST_HEAD_INIT(init_task.ptraced),

.ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),

.real_parent = &init_task,

.parent = &init_task,

.children = LIST_HEAD_INIT(init_task.children),

.sibling = LIST_HEAD_INIT(init_task.sibling),

.group_leader = &init_task,

RCU_POINTER_INITIALIZER(real_cred, &init_cred),

RCU_POINTER_INITIALIZER(cred, &init_cred),

.comm = INIT_TASK_COMM,

.thread = INIT_THREAD,

.fs = &init_fs,

.files = &init_files,

#ifdef CONFIG_IO_URING

.io_uring = NULL,

#endif

.signal = &init_signals,

.sighand = &init_sighand,

.nsproxy = &init_nsproxy,

.pending = {

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

.signal = {{0}}

.blocked = {{0}},

.alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),

.journal_info = NULL,

INIT_CPU_TIMERS(init_task)

.pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),

.blocked_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.blocked_lock),

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

.thread_pid = &init_struct_pid,

.thread_node = LIST_HEAD_INIT(init_signals.thread_head),

#ifdef CONFIG_AUDIT

.loginuid = INVALID_UID,

.sessionid = AUDIT_SID_UNSET,

#endif

#ifdef CONFIG_PERF_EVENTS

.perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),

.perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),

#endif

#ifdef CONFIG_PREEMPT_RCU

.rcu_read_lock_nesting = 0,

.rcu_read_unlock_special.s = 0,

.rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),

.rcu_blocked_node = NULL,

#endif

#ifdef CONFIG_TASKS_RCU

.rcu_tasks_holdout = false,

.rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),

.rcu_tasks_idle_cpu = -1,

.rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list),

#endif

#ifdef CONFIG_TASKS_TRACE_RCU

.trc_reader_nesting = 0,

#endif

#ifdef CONFIG_CPUSETS

.mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,

&init_task.alloc_lock),

#endif

#ifdef CONFIG_RT_MUTEXES

.pi_waiters = RB_ROOT_CACHED,

.pi_top_task = NULL,

#endif

INIT_PREV_CPUTIME(init_task)

#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN

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

.vtime.starttime = 0,

.vtime.state = VTIME_SYS,

#endif

#ifdef CONFIG_NUMA_BALANCING

.numa_preferred_nid = NUMA_NO_NODE,

.numa_group = NULL,

.numa_faults = NULL,

#endif

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

.kasan_depth = 1,

#endif

#ifdef CONFIG_KCSAN

.kcsan_ctx = {

.scoped_accesses = {LIST_POISON1, NULL},

#endif

#ifdef CONFIG_TRACE_IRQFLAGS

.softirqs_enabled = 1,

#endif

#ifdef CONFIG_LOCKDEP

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

.curr_chain_key = INITIAL_CHAIN_KEY,

.lockdep_recursion = 0,

#endif

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

.ret_stack = NULL,

.tracing_graph_pause = ATOMIC_INIT(0),

#endif

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

.trace_recursion = 0,

#endif

#ifdef CONFIG_LIVEPATCH

.patch_state = KLP_TRANSITION_IDLE,

#endif

#ifdef CONFIG_SECURITY

.security = NULL,

#endif

#ifdef CONFIG_SECCOMP_FILTER

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

#endif

#ifdef CONFIG_SCHED_MM_CID

.mm_cid = { .cid = MM_CID_UNSET, },

#endif

};

EXPORT_SYMBOL(init_task);

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

* linker map entry.

#ifndef CONFIG_THREAD_INFO_IN_TASK

struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);

#endif

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