1
2#ifndef _LINUX_SCHED_SIGNAL_H
3#define _LINUX_SCHED_SIGNAL_H
4
5#include <linux/rculist.h>
6#include <linux/signal.h>
7#include <linux/sched.h>
8#include <linux/sched/jobctl.h>
9#include <linux/sched/task.h>
10#include <linux/cred.h>
11#include <linux/refcount.h>
12
13
14
15
16
17struct sighand_struct {
18 refcount_t count;
19 struct k_sigaction action[_NSIG];
20 spinlock_t siglock;
21 wait_queue_head_t signalfd_wqh;
22};
23
24
25
26
27struct pacct_struct {
28 int ac_flag;
29 long ac_exitcode;
30 unsigned long ac_mem;
31 u64 ac_utime, ac_stime;
32 unsigned long ac_minflt, ac_majflt;
33};
34
35struct cpu_itimer {
36 u64 expires;
37 u64 incr;
38};
39
40
41
42
43
44struct task_cputime_atomic {
45 atomic64_t utime;
46 atomic64_t stime;
47 atomic64_t sum_exec_runtime;
48};
49
50#define INIT_CPUTIME_ATOMIC \
51 (struct task_cputime_atomic) { \
52 .utime = ATOMIC64_INIT(0), \
53 .stime = ATOMIC64_INIT(0), \
54 .sum_exec_runtime = ATOMIC64_INIT(0), \
55 }
56
57
58
59
60
61
62
63
64
65
66
67struct thread_group_cputimer {
68 struct task_cputime_atomic cputime_atomic;
69 bool running;
70 bool checking_timer;
71};
72
73struct multiprocess_signals {
74 sigset_t signal;
75 struct hlist_node node;
76};
77
78
79
80
81
82
83
84
85struct signal_struct {
86 refcount_t sigcnt;
87 atomic_t live;
88 int nr_threads;
89 struct list_head thread_head;
90
91 wait_queue_head_t wait_chldexit;
92
93
94 struct task_struct *curr_target;
95
96
97 struct sigpending shared_pending;
98
99
100 struct hlist_head multiprocess;
101
102
103 int group_exit_code;
104
105
106
107
108
109 int notify_count;
110 struct task_struct *group_exit_task;
111
112
113 int group_stop_count;
114 unsigned int flags;
115
116
117
118
119
120
121
122
123
124
125 unsigned int is_child_subreaper:1;
126 unsigned int has_child_subreaper:1;
127
128#ifdef CONFIG_POSIX_TIMERS
129
130
131 int posix_timer_id;
132 struct list_head posix_timers;
133
134
135 struct hrtimer real_timer;
136 ktime_t it_real_incr;
137
138
139
140
141
142
143 struct cpu_itimer it[2];
144
145
146
147
148
149 struct thread_group_cputimer cputimer;
150
151
152 struct task_cputime cputime_expires;
153
154 struct list_head cpu_timers[3];
155
156#endif
157
158
159 struct pid *pids[PIDTYPE_MAX];
160
161#ifdef CONFIG_NO_HZ_FULL
162 atomic_t tick_dep_mask;
163#endif
164
165 struct pid *tty_old_pgrp;
166
167
168 int leader;
169
170 struct tty_struct *tty;
171
172#ifdef CONFIG_SCHED_AUTOGROUP
173 struct autogroup *autogroup;
174#endif
175
176
177
178
179
180
181 seqlock_t stats_lock;
182 u64 utime, stime, cutime, cstime;
183 u64 gtime;
184 u64 cgtime;
185 struct prev_cputime prev_cputime;
186 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
187 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
188 unsigned long inblock, oublock, cinblock, coublock;
189 unsigned long maxrss, cmaxrss;
190 struct task_io_accounting ioac;
191
192
193
194
195
196
197
198 unsigned long long sum_sched_runtime;
199
200
201
202
203
204
205
206
207
208
209 struct rlimit rlim[RLIM_NLIMITS];
210
211#ifdef CONFIG_BSD_PROCESS_ACCT
212 struct pacct_struct pacct;
213#endif
214#ifdef CONFIG_TASKSTATS
215 struct taskstats *stats;
216#endif
217#ifdef CONFIG_AUDIT
218 unsigned audit_tty;
219 struct tty_audit_buf *tty_audit_buf;
220#endif
221
222
223
224
225
226 bool oom_flag_origin;
227 short oom_score_adj;
228 short oom_score_adj_min;
229
230 struct mm_struct *oom_mm;
231
232
233 struct mutex cred_guard_mutex;
234
235
236} __randomize_layout;
237
238
239
240
241#define SIGNAL_STOP_STOPPED 0x00000001
242#define SIGNAL_STOP_CONTINUED 0x00000002
243#define SIGNAL_GROUP_EXIT 0x00000004
244#define SIGNAL_GROUP_COREDUMP 0x00000008
245
246
247
248#define SIGNAL_CLD_STOPPED 0x00000010
249#define SIGNAL_CLD_CONTINUED 0x00000020
250#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
251
252#define SIGNAL_UNKILLABLE 0x00000040
253
254#define SIGNAL_STOP_MASK (SIGNAL_CLD_MASK | SIGNAL_STOP_STOPPED | \
255 SIGNAL_STOP_CONTINUED)
256
257static inline void signal_set_stop_flags(struct signal_struct *sig,
258 unsigned int flags)
259{
260 WARN_ON(sig->flags & (SIGNAL_GROUP_EXIT|SIGNAL_GROUP_COREDUMP));
261 sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags;
262}
263
264
265static inline int signal_group_exit(const struct signal_struct *sig)
266{
267 return (sig->flags & SIGNAL_GROUP_EXIT) ||
268 (sig->group_exit_task != NULL);
269}
270
271extern void flush_signals(struct task_struct *);
272extern void ignore_signals(struct task_struct *);
273extern void flush_signal_handlers(struct task_struct *, int force_default);
274extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, kernel_siginfo_t *info);
275
276static inline int kernel_dequeue_signal(void)
277{
278 struct task_struct *tsk = current;
279 kernel_siginfo_t __info;
280 int ret;
281
282 spin_lock_irq(&tsk->sighand->siglock);
283 ret = dequeue_signal(tsk, &tsk->blocked, &__info);
284 spin_unlock_irq(&tsk->sighand->siglock);
285
286 return ret;
287}
288
289static inline void kernel_signal_stop(void)
290{
291 spin_lock_irq(¤t->sighand->siglock);
292 if (current->jobctl & JOBCTL_STOP_DEQUEUED)
293 set_special_state(TASK_STOPPED);
294 spin_unlock_irq(¤t->sighand->siglock);
295
296 schedule();
297}
298#ifdef __ARCH_SI_TRAPNO
299# define ___ARCH_SI_TRAPNO(_a1) , _a1
300#else
301# define ___ARCH_SI_TRAPNO(_a1)
302#endif
303#ifdef __ia64__
304# define ___ARCH_SI_IA64(_a1, _a2, _a3) , _a1, _a2, _a3
305#else
306# define ___ARCH_SI_IA64(_a1, _a2, _a3)
307#endif
308
309int force_sig_fault(int sig, int code, void __user *addr
310 ___ARCH_SI_TRAPNO(int trapno)
311 ___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr)
312 , struct task_struct *t);
313int send_sig_fault(int sig, int code, void __user *addr
314 ___ARCH_SI_TRAPNO(int trapno)
315 ___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr)
316 , struct task_struct *t);
317
318int force_sig_mceerr(int code, void __user *, short, struct task_struct *);
319int send_sig_mceerr(int code, void __user *, short, struct task_struct *);
320
321int force_sig_bnderr(void __user *addr, void __user *lower, void __user *upper);
322int force_sig_pkuerr(void __user *addr, u32 pkey);
323
324int force_sig_ptrace_errno_trap(int errno, void __user *addr);
325
326extern int send_sig_info(int, struct kernel_siginfo *, struct task_struct *);
327extern void force_sigsegv(int sig, struct task_struct *p);
328extern int force_sig_info(int, struct kernel_siginfo *, struct task_struct *);
329extern int __kill_pgrp_info(int sig, struct kernel_siginfo *info, struct pid *pgrp);
330extern int kill_pid_info(int sig, struct kernel_siginfo *info, struct pid *pid);
331extern int kill_pid_info_as_cred(int, struct kernel_siginfo *, struct pid *,
332 const struct cred *);
333extern int kill_pgrp(struct pid *pid, int sig, int priv);
334extern int kill_pid(struct pid *pid, int sig, int priv);
335extern __must_check bool do_notify_parent(struct task_struct *, int);
336extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
337extern void force_sig(int, struct task_struct *);
338extern int send_sig(int, struct task_struct *, int);
339extern int zap_other_threads(struct task_struct *p);
340extern struct sigqueue *sigqueue_alloc(void);
341extern void sigqueue_free(struct sigqueue *);
342extern int send_sigqueue(struct sigqueue *, struct pid *, enum pid_type);
343extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
344
345static inline int restart_syscall(void)
346{
347 set_tsk_thread_flag(current, TIF_SIGPENDING);
348 return -ERESTARTNOINTR;
349}
350
351static inline int signal_pending(struct task_struct *p)
352{
353 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
354}
355
356static inline int __fatal_signal_pending(struct task_struct *p)
357{
358 return unlikely(sigismember(&p->pending.signal, SIGKILL));
359}
360
361static inline int fatal_signal_pending(struct task_struct *p)
362{
363 return signal_pending(p) && __fatal_signal_pending(p);
364}
365
366static inline int signal_pending_state(long state, struct task_struct *p)
367{
368 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
369 return 0;
370 if (!signal_pending(p))
371 return 0;
372
373 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
374}
375
376
377
378
379
380
381
382extern void recalc_sigpending_and_wake(struct task_struct *t);
383extern void recalc_sigpending(void);
384extern void calculate_sigpending(void);
385
386extern void signal_wake_up_state(struct task_struct *t, unsigned int state);
387
388static inline void signal_wake_up(struct task_struct *t, bool resume)
389{
390 signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0);
391}
392static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume)
393{
394 signal_wake_up_state(t, resume ? __TASK_TRACED : 0);
395}
396
397void task_join_group_stop(struct task_struct *task);
398
399#ifdef TIF_RESTORE_SIGMASK
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416static inline void set_restore_sigmask(void)
417{
418 set_thread_flag(TIF_RESTORE_SIGMASK);
419 WARN_ON(!test_thread_flag(TIF_SIGPENDING));
420}
421
422static inline void clear_tsk_restore_sigmask(struct task_struct *tsk)
423{
424 clear_tsk_thread_flag(tsk, TIF_RESTORE_SIGMASK);
425}
426
427static inline void clear_restore_sigmask(void)
428{
429 clear_thread_flag(TIF_RESTORE_SIGMASK);
430}
431static inline bool test_tsk_restore_sigmask(struct task_struct *tsk)
432{
433 return test_tsk_thread_flag(tsk, TIF_RESTORE_SIGMASK);
434}
435static inline bool test_restore_sigmask(void)
436{
437 return test_thread_flag(TIF_RESTORE_SIGMASK);
438}
439static inline bool test_and_clear_restore_sigmask(void)
440{
441 return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
442}
443
444#else
445
446
447static inline void set_restore_sigmask(void)
448{
449 current->restore_sigmask = true;
450 WARN_ON(!test_thread_flag(TIF_SIGPENDING));
451}
452static inline void clear_tsk_restore_sigmask(struct task_struct *tsk)
453{
454 tsk->restore_sigmask = false;
455}
456static inline void clear_restore_sigmask(void)
457{
458 current->restore_sigmask = false;
459}
460static inline bool test_restore_sigmask(void)
461{
462 return current->restore_sigmask;
463}
464static inline bool test_tsk_restore_sigmask(struct task_struct *tsk)
465{
466 return tsk->restore_sigmask;
467}
468static inline bool test_and_clear_restore_sigmask(void)
469{
470 if (!current->restore_sigmask)
471 return false;
472 current->restore_sigmask = false;
473 return true;
474}
475#endif
476
477static inline void restore_saved_sigmask(void)
478{
479 if (test_and_clear_restore_sigmask())
480 __set_current_blocked(¤t->saved_sigmask);
481}
482
483static inline sigset_t *sigmask_to_save(void)
484{
485 sigset_t *res = ¤t->blocked;
486 if (unlikely(test_restore_sigmask()))
487 res = ¤t->saved_sigmask;
488 return res;
489}
490
491static inline int kill_cad_pid(int sig, int priv)
492{
493 return kill_pid(cad_pid, sig, priv);
494}
495
496
497#define SEND_SIG_NOINFO ((struct kernel_siginfo *) 0)
498#define SEND_SIG_PRIV ((struct kernel_siginfo *) 1)
499
500
501
502
503static inline int on_sig_stack(unsigned long sp)
504{
505
506
507
508
509
510
511
512
513
514 if (current->sas_ss_flags & SS_AUTODISARM)
515 return 0;
516
517#ifdef CONFIG_STACK_GROWSUP
518 return sp >= current->sas_ss_sp &&
519 sp - current->sas_ss_sp < current->sas_ss_size;
520#else
521 return sp > current->sas_ss_sp &&
522 sp - current->sas_ss_sp <= current->sas_ss_size;
523#endif
524}
525
526static inline int sas_ss_flags(unsigned long sp)
527{
528 if (!current->sas_ss_size)
529 return SS_DISABLE;
530
531 return on_sig_stack(sp) ? SS_ONSTACK : 0;
532}
533
534static inline void sas_ss_reset(struct task_struct *p)
535{
536 p->sas_ss_sp = 0;
537 p->sas_ss_size = 0;
538 p->sas_ss_flags = SS_DISABLE;
539}
540
541static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
542{
543 if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
544#ifdef CONFIG_STACK_GROWSUP
545 return current->sas_ss_sp;
546#else
547 return current->sas_ss_sp + current->sas_ss_size;
548#endif
549 return sp;
550}
551
552extern void __cleanup_sighand(struct sighand_struct *);
553extern void flush_itimer_signals(void);
554
555#define tasklist_empty() \
556 list_empty(&init_task.tasks)
557
558#define next_task(p) \
559 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
560
561#define for_each_process(p) \
562 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
563
564extern bool current_is_single_threaded(void);
565
566
567
568
569
570#define do_each_thread(g, t) \
571 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
572
573#define while_each_thread(g, t) \
574 while ((t = next_thread(t)) != g)
575
576#define __for_each_thread(signal, t) \
577 list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
578
579#define for_each_thread(p, t) \
580 __for_each_thread((p)->signal, t)
581
582
583#define for_each_process_thread(p, t) \
584 for_each_process(p) for_each_thread(p, t)
585
586typedef int (*proc_visitor)(struct task_struct *p, void *data);
587void walk_process_tree(struct task_struct *top, proc_visitor, void *);
588
589static inline
590struct pid *task_pid_type(struct task_struct *task, enum pid_type type)
591{
592 struct pid *pid;
593 if (type == PIDTYPE_PID)
594 pid = task_pid(task);
595 else
596 pid = task->signal->pids[type];
597 return pid;
598}
599
600static inline struct pid *task_tgid(struct task_struct *task)
601{
602 return task->signal->pids[PIDTYPE_TGID];
603}
604
605
606
607
608
609
610static inline struct pid *task_pgrp(struct task_struct *task)
611{
612 return task->signal->pids[PIDTYPE_PGID];
613}
614
615static inline struct pid *task_session(struct task_struct *task)
616{
617 return task->signal->pids[PIDTYPE_SID];
618}
619
620static inline int get_nr_threads(struct task_struct *tsk)
621{
622 return tsk->signal->nr_threads;
623}
624
625static inline bool thread_group_leader(struct task_struct *p)
626{
627 return p->exit_signal >= 0;
628}
629
630
631
632
633
634
635
636static inline bool has_group_leader_pid(struct task_struct *p)
637{
638 return task_pid(p) == task_tgid(p);
639}
640
641static inline
642bool same_thread_group(struct task_struct *p1, struct task_struct *p2)
643{
644 return p1->signal == p2->signal;
645}
646
647static inline struct task_struct *next_thread(const struct task_struct *p)
648{
649 return list_entry_rcu(p->thread_group.next,
650 struct task_struct, thread_group);
651}
652
653static inline int thread_group_empty(struct task_struct *p)
654{
655 return list_empty(&p->thread_group);
656}
657
658#define delay_group_leader(p) \
659 (thread_group_leader(p) && !thread_group_empty(p))
660
661extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
662 unsigned long *flags);
663
664static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
665 unsigned long *flags)
666{
667 struct sighand_struct *ret;
668
669 ret = __lock_task_sighand(tsk, flags);
670 (void)__cond_lock(&tsk->sighand->siglock, ret);
671 return ret;
672}
673
674static inline void unlock_task_sighand(struct task_struct *tsk,
675 unsigned long *flags)
676{
677 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
678}
679
680static inline unsigned long task_rlimit(const struct task_struct *tsk,
681 unsigned int limit)
682{
683 return READ_ONCE(tsk->signal->rlim[limit].rlim_cur);
684}
685
686static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
687 unsigned int limit)
688{
689 return READ_ONCE(tsk->signal->rlim[limit].rlim_max);
690}
691
692static inline unsigned long rlimit(unsigned int limit)
693{
694 return task_rlimit(current, limit);
695}
696
697static inline unsigned long rlimit_max(unsigned int limit)
698{
699 return task_rlimit_max(current, limit);
700}
701
702#endif
703