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 #include <linux/plist.h>
16
17 #include <linux/uaccess.h>
18
19 static struct signal_struct init_signals = {
20 .nr_threads = 1,
21 .thread_head = LIST_HEAD_INIT(init_task.thread_node),
22 .wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
23 .shared_pending = {
24 .list = LIST_HEAD_INIT(init_signals.shared_pending.list),
25 .signal = {{0}}
26 },
27 .multiprocess = HLIST_HEAD_INIT,
28 .rlim = INIT_RLIMITS,
29 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
30 .exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),
31 #ifdef CONFIG_POSIX_TIMERS
32 .posix_timers = LIST_HEAD_INIT(init_signals.posix_timers),
33 .cputimer = {
34 .cputime_atomic = INIT_CPUTIME_ATOMIC,
35 },
36 #endif
37 INIT_CPU_TIMERS(init_signals)
38 .pids = {
39 [PIDTYPE_PID] = &init_struct_pid,
40 [PIDTYPE_TGID] = &init_struct_pid,
41 [PIDTYPE_PGID] = &init_struct_pid,
42 [PIDTYPE_SID] = &init_struct_pid,
43 },
44 INIT_PREV_CPUTIME(init_signals)
45 };
46
47 static struct sighand_struct init_sighand = {
48 .count = REFCOUNT_INIT(1),
49 .action = { { { .sa_handler = SIG_DFL, } }, },
50 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
51 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
52 };
53
54 #ifdef CONFIG_SHADOW_CALL_STACK
55 unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = {
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 __aligned(L1_CACHE_BYTES) = {
65 #ifdef CONFIG_THREAD_INFO_IN_TASK
66 .thread_info = INIT_THREAD_INFO(init_task),
67 .stack_refcount = REFCOUNT_INIT(1),
68 #endif
69 .__state = 0,
70 .stack = init_stack,
71 .usage = REFCOUNT_INIT(2),
72 .flags = PF_KTHREAD,
73 .prio = MAX_PRIO - 20,
74 .static_prio = MAX_PRIO - 20,
75 .normal_prio = MAX_PRIO - 20,
76 .policy = SCHED_NORMAL,
77 .cpus_ptr = &init_task.cpus_mask,
78 .user_cpus_ptr = NULL,
79 .cpus_mask = CPU_MASK_ALL,
80 .max_allowed_capacity = SCHED_CAPACITY_SCALE,
81 .nr_cpus_allowed= NR_CPUS,
82 .mm = NULL,
83 .active_mm = &init_mm,
84 .faults_disabled_mapping = NULL,
85 .restart_block = {
86 .fn = do_no_restart_syscall,
87 },
88 .se = {
89 .group_node = LIST_HEAD_INIT(init_task.se.group_node),
90 },
91 .rt = {
92 .run_list = LIST_HEAD_INIT(init_task.rt.run_list),
93 .time_slice = RR_TIMESLICE,
94 },
95 .tasks = LIST_HEAD_INIT(init_task.tasks),
96 #ifdef CONFIG_SMP
97 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
98 #endif
99 #ifdef CONFIG_CGROUP_SCHED
100 .sched_task_group = &root_task_group,
101 #endif
102 .ptraced = LIST_HEAD_INIT(init_task.ptraced),
103 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
104 .real_parent = &init_task,
105 .parent = &init_task,
106 .children = LIST_HEAD_INIT(init_task.children),
107 .sibling = LIST_HEAD_INIT(init_task.sibling),
108 .group_leader = &init_task,
109 RCU_POINTER_INITIALIZER(real_cred, &init_cred),
110 RCU_POINTER_INITIALIZER(cred, &init_cred),
111 .comm = INIT_TASK_COMM,
112 .thread = INIT_THREAD,
113 .fs = &init_fs,
114 .files = &init_files,
115 #ifdef CONFIG_IO_URING
116 .io_uring = NULL,
117 #endif
118 .signal = &init_signals,
119 .sighand = &init_sighand,
120 .nsproxy = &init_nsproxy,
121 .pending = {
122 .list = LIST_HEAD_INIT(init_task.pending.list),
123 .signal = {{0}}
124 },
125 .blocked = {{0}},
126 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
127 .journal_info = NULL,
128 INIT_CPU_TIMERS(init_task)
129 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
130 .timer_slack_ns = 50000, /* 50 usec default slack */
131 .thread_pid = &init_struct_pid,
132 .thread_node = LIST_HEAD_INIT(init_signals.thread_head),
133 #ifdef CONFIG_AUDIT
134 .loginuid = INVALID_UID,
135 .sessionid = AUDIT_SID_UNSET,
136 #endif
137 #ifdef CONFIG_PERF_EVENTS
138 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
139 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
140 #endif
141 #ifdef CONFIG_PREEMPT_RCU
142 .rcu_read_lock_nesting = 0,
143 .rcu_read_unlock_special.s = 0,
144 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
145 .rcu_blocked_node = NULL,
146 #endif
147 #ifdef CONFIG_TASKS_RCU
148 .rcu_tasks_holdout = false,
149 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
150 .rcu_tasks_idle_cpu = -1,
151 .rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list),
152 #endif
153 #ifdef CONFIG_TASKS_TRACE_RCU
154 .trc_reader_nesting = 0,
155 .trc_reader_special.s = 0,
156 .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list),
157 .trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node),
158 #endif
159 #ifdef CONFIG_CPUSETS
160 .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,
161 &init_task.alloc_lock),
162 #endif
163 #ifdef CONFIG_RT_MUTEXES
164 .pi_waiters = RB_ROOT_CACHED,
165 .pi_top_task = NULL,
166 #endif
167 INIT_PREV_CPUTIME(init_task)
168 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
169 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
170 .vtime.starttime = 0,
171 .vtime.state = VTIME_SYS,
172 #endif
173 #ifdef CONFIG_NUMA_BALANCING
174 .numa_preferred_nid = NUMA_NO_NODE,
175 .numa_group = NULL,
176 .numa_faults = NULL,
177 #endif
178 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
179 .kasan_depth = 1,
180 #endif
181 #ifdef CONFIG_KCSAN
182 .kcsan_ctx = {
183 .scoped_accesses = {LIST_POISON1, NULL},
184 },
185 #endif
186 #ifdef CONFIG_TRACE_IRQFLAGS
187 .softirqs_enabled = 1,
188 #endif
189 #ifdef CONFIG_LOCKDEP
190 .lockdep_depth = 0, /* no locks held yet */
191 .curr_chain_key = INITIAL_CHAIN_KEY,
192 .lockdep_recursion = 0,
193 #endif
194 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
195 .ret_stack = NULL,
196 .tracing_graph_pause = ATOMIC_INIT(0),
197 #endif
198 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
199 .trace_recursion = 0,
200 #endif
201 #ifdef CONFIG_LIVEPATCH
202 .patch_state = KLP_TRANSITION_IDLE,
203 #endif
204 #ifdef CONFIG_SECURITY
205 .security = NULL,
206 #endif
207 #ifdef CONFIG_SECCOMP_FILTER
208 .seccomp = { .filter_count = ATOMIC_INIT(0) },
209 #endif
210 #if defined(CONFIG_CCSECURITY) && !defined(CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY)
211 .ccs_domain_info = NULL,
212 .ccs_flags = 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
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