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/* SPDX-License-Identifier: GPL-2.0 / #ifndef _LINUX_SCHED_SIGNAL_H #define _LINUX_SCHED_SIGNAL_H #include <linux/rculist.h> #include <linux/signal.h> #include <linux/sched.h> #include <linux/sched/jobctl.h> #include <linux/sched/task.h> #include <linux/cred.h> #include <linux/refcount.h> #include <linux/posix-timers.h> / * Types defining task->signal and task->sighand and APIs using them: / struct sighand_struct { spinlock_t siglock; refcount_t count; wait_queue_head_t signalfd_wqh; struct k_sigaction action[_NSIG]; }; / * Per-process accounting stats: / struct pacct_struct { int ac_flag; long ac_exitcode; unsigned long ac_mem; u64 ac_utime, ac_stime; unsigned long ac_minflt, ac_majflt; }; struct cpu_itimer { u64 expires; u64 incr; }; / * This is the atomic variant of task_cputime, which can be used for * storing and updating task_cputime statistics without locking. / struct task_cputime_atomic { atomic64_t utime; atomic64_t stime; atomic64_t sum_exec_runtime; }; #define INIT_CPUTIME_ATOMIC \ (struct task_cputime_atomic) { \ .utime = ATOMIC64_INIT(0), \ .stime = ATOMIC64_INIT(0), \ .sum_exec_runtime = ATOMIC64_INIT(0), \ } /* * struct thread_group_cputimer - thread group interval timer counts * @cputime_atomic: atomic thread group interval timers. * * This structure contains the version of task_cputime, above, that is * used for thread group CPU timer calculations. / struct thread_group_cputimer { struct task_cputime_atomic cputime_atomic; }; struct multiprocess_signals { sigset_t signal; struct hlist_node node; }; / * NOTE! "signal_struct" does not have its own * locking, because a shared signal_struct always * implies a shared sighand_struct, so locking * sighand_struct is always a proper superset of * the locking of signal_struct. / struct signal_struct { refcount_t sigcnt; atomic_t live; int nr_threads; struct list_head thread_head; wait_queue_head_t wait_chldexit; / for wait4() / / current thread group signal load-balancing target: / struct task_struct curr_target; /* shared signal handling: / struct sigpending shared_pending; / For collecting multiprocess signals during fork / struct hlist_head multiprocess; / thread group exit support / int group_exit_code; / overloaded: * - notify group_exit_task when ->count is equal to notify_count * - everyone except group_exit_task is stopped during signal delivery * of fatal signals, group_exit_task processes the signal. / int notify_count; struct task_struct group_exit_task; /* thread group stop support, overloads group_exit_code too / int group_stop_count; unsigned int flags; / see SIGNAL_* flags below / / * PR_SET_CHILD_SUBREAPER marks a process, like a service * manager, to re-parent orphan (double-forking) child processes * to this process instead of 'init'. The service manager is * able to receive SIGCHLD signals and is able to investigate * the process until it calls wait(). All children of this * process will inherit a flag if they should look for a * child_subreaper process at exit. / unsigned int is_child_subreaper:1; unsigned int has_child_subreaper:1; #ifdef CONFIG_POSIX_TIMERS / POSIX.1b Interval Timers / unsigned int next_posix_timer_id; struct list_head posix_timers; / ITIMER_REAL timer for the process / struct hrtimer real_timer; ktime_t it_real_incr; / * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these * values are defined to 0 and 1 respectively / struct cpu_itimer it[2]; / * Thread group totals for process CPU timers. * See thread_group_cputimer(), et al, for details. / struct thread_group_cputimer cputimer; #endif / Empty if CONFIG_POSIX_TIMERS=n / struct posix_cputimers posix_cputimers; / PID/PID hash table linkage. / struct pid pids[PIDTYPE_MAX]; #ifdef CONFIG_NO_HZ_FULL atomic_t tick_dep_mask; #endif struct pid tty_old_pgrp; / boolean value for session group leader / int leader; struct tty_struct tty; /* NULL if no tty / #ifdef CONFIG_SCHED_AUTOGROUP struct autogroup autogroup; #endif /* * Cumulative resource counters for dead threads in the group, * and for reaped dead child processes forked by this group. * Live threads maintain their own counters and add to these * in __exit_signal, except for the group leader. / seqlock_t stats_lock; u64 utime, stime, cutime, cstime; u64 gtime; u64 cgtime; struct prev_cputime prev_cputime; unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; unsigned long inblock, oublock, cinblock, coublock; unsigned long maxrss, cmaxrss; struct task_io_accounting ioac; / * Cumulative ns of schedule CPU time fo dead threads in the * group, not including a zombie group leader, (This only differs * from jiffies_to_ns(utime + stime) if sched_clock uses something * other than jiffies.) / unsigned long long sum_sched_runtime; / * We don't bother to synchronize most readers of this at all, * because there is no reader checking a limit that actually needs * to get both rlim_cur and rlim_max atomically, and either one * alone is a single word that can safely be read normally. * getrlimit/setrlimit use task_lock(current->group_leader) to * protect this instead of the siglock, because they really * have no need to disable irqs. / struct rlimit rlim[RLIM_NLIMITS]; #ifdef CONFIG_BSD_PROCESS_ACCT struct pacct_struct pacct; / per-process accounting information / #endif #ifdef CONFIG_TASKSTATS struct taskstats stats; #endif #ifdef CONFIG_AUDIT unsigned audit_tty; struct tty_audit_buf tty_audit_buf; #endif / * Thread is the potential origin of an oom condition; kill first on * oom / bool oom_flag_origin; short oom_score_adj; / OOM kill score adjustment / short oom_score_adj_min; / OOM kill score adjustment min value. * Only settable by CAP_SYS_RESOURCE. / struct mm_struct oom_mm; /* recorded mm when the thread group got * killed by the oom killer / struct mutex cred_guard_mutex; / guard against foreign influences on * credential calculations * (notably. ptrace) * Deprecated do not use in new code. * Use exec_update_lock instead. / struct rw_semaphore exec_update_lock; / Held while task_struct is * being updated during exec, * and may have inconsistent * permissions. / } __randomize_layout; / * Bits in flags field of signal_struct. / #define SIGNAL_STOP_STOPPED 0x00000001 / job control stop in effect / #define SIGNAL_STOP_CONTINUED 0x00000002 / SIGCONT since WCONTINUED reap / #define SIGNAL_GROUP_EXIT 0x00000004 / group exit in progress / #define SIGNAL_GROUP_COREDUMP 0x00000008 / coredump in progress / / * Pending notifications to parent. / #define SIGNAL_CLD_STOPPED 0x00000010 #define SIGNAL_CLD_CONTINUED 0x00000020 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED\|SIGNAL_CLD_CONTINUED) #define SIGNAL_UNKILLABLE 0x00000040 / for init: ignore fatal signals / #define SIGNAL_STOP_MASK (SIGNAL_CLD_MASK \| SIGNAL_STOP_STOPPED \| \ SIGNAL_STOP_CONTINUED) static inline void signal_set_stop_flags(struct signal_struct sig, unsigned int flags) { WARN_ON(sig->flags & (SIGNAL_GROUP_EXIT\|SIGNAL_GROUP_COREDUMP)); sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) \| flags; } /* If true, all threads except ->group_exit_task have pending SIGKILL / static inline int signal_group_exit(const struct signal_struct sig) { return (sig->flags & SIGNAL_GROUP_EXIT) \|\| (sig->group_exit_task != NULL); } extern void flush_signals(struct task_struct ); extern void ignore_signals(struct task_struct ); extern void flush_signal_handlers(struct task_struct , int force_default); extern int dequeue_signal(struct task_struct task, sigset_t mask, kernel_siginfo_t info); static inline int kernel_dequeue_signal(void) { struct task_struct task = current; kernel_siginfo_t __info; int ret; spin_lock_irq(&task->sighand->siglock); ret = dequeue_signal(task, &task->blocked, &__info); spin_unlock_irq(&task->sighand->siglock); return ret; } static inline void kernel_signal_stop(void) { spin_lock_irq(&current->sighand->siglock); if (current->jobctl & JOBCTL_STOP_DEQUEUED) set_special_state(TASK_STOPPED); spin_unlock_irq(&current->sighand->siglock); schedule(); } #ifdef __ARCH_SI_TRAPNO # define ___ARCH_SI_TRAPNO(_a1) , _a1 #else # define ___ARCH_SI_TRAPNO(_a1) #endif #ifdef __ia64__ # define ___ARCH_SI_IA64(_a1, _a2, _a3) , _a1, _a2, _a3 #else # define ___ARCH_SI_IA64(_a1, _a2, _a3) #endif int force_sig_fault_to_task(int sig, int code, void __user addr ___ARCH_SI_TRAPNO(int trapno) ___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr) , struct task_struct t); int force_sig_fault(int sig, int code, void __user addr ___ARCH_SI_TRAPNO(int trapno) ___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr)); int send_sig_fault(int sig, int code, void __user addr ___ARCH_SI_TRAPNO(int trapno) ___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr) , struct task_struct t); int force_sig_mceerr(int code, void __user , short); int send_sig_mceerr(int code, void __user , short, struct task_struct ); int force_sig_bnderr(void __user addr, void __user lower, void __user upper); int force_sig_pkuerr(void __user addr, u32 pkey); int force_sig_ptrace_errno_trap(int errno, void __user addr); extern int send_sig_info(int, struct kernel_siginfo , struct task_struct ); extern void force_sigsegv(int sig); extern int force_sig_info(struct kernel_siginfo ); extern int __kill_pgrp_info(int sig, struct kernel_siginfo info, struct pid pgrp); extern int kill_pid_info(int sig, struct kernel_siginfo info, struct pid pid); extern int kill_pid_usb_asyncio(int sig, int errno, sigval_t addr, struct pid , const struct cred ); extern int kill_pgrp(struct pid pid, int sig, int priv); extern int kill_pid(struct pid pid, int sig, int priv); extern __must_check bool do_notify_parent(struct task_struct , int); extern void __wake_up_parent(struct task_struct p, struct task_struct parent); extern void force_sig(int); extern int send_sig(int, struct task_struct , int); extern int zap_other_threads(struct task_struct p); extern struct sigqueue sigqueue_alloc(void); extern void sigqueue_free(struct sigqueue ); extern int send_sigqueue(struct sigqueue , struct pid , enum pid_type); extern int do_sigaction(int, struct k_sigaction , struct k_sigaction ); static inline int restart_syscall(void) { set_tsk_thread_flag(current, TIF_SIGPENDING); return -ERESTARTNOINTR; } static inline int signal_pending(struct task_struct p) { return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); } static inline int __fatal_signal_pending(struct task_struct p) { return unlikely(sigismember(&p->pending.signal, SIGKILL)); } static inline int fatal_signal_pending(struct task_struct p) { return signal_pending(p) && __fatal_signal_pending(p); } static inline int signal_pending_state(long state, struct task_struct p) { if (!(state & (TASK_INTERRUPTIBLE \| TASK_WAKEKILL))) return 0; if (!signal_pending(p)) return 0; return (state & TASK_INTERRUPTIBLE) \|\| __fatal_signal_pending(p); } /* * Reevaluate whether the task has signals pending delivery. * Wake the task if so. * This is required every time the blocked sigset_t changes. * callers must hold sighand->siglock. / extern void recalc_sigpending_and_wake(struct task_struct t); extern void recalc_sigpending(void); extern void calculate_sigpending(void); extern void signal_wake_up_state(struct task_struct t, unsigned int state); static inline void signal_wake_up(struct task_struct t, bool resume) { signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0); } static inline void ptrace_signal_wake_up(struct task_struct t, bool resume) { signal_wake_up_state(t, resume ? __TASK_TRACED : 0); } void task_join_group_stop(struct task_struct task); #ifdef TIF_RESTORE_SIGMASK /* * Legacy restore_sigmask accessors. These are inefficient on * SMP architectures because they require atomic operations. / /* * set_restore_sigmask() - make sure saved_sigmask processing gets done * * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code * will run before returning to user mode, to process the flag. For * all callers, TIF_SIGPENDING is already set or it's no harm to set * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the * arch code will notice on return to user mode, in case those bits * are scarce. We set TIF_SIGPENDING here to ensure that the arch * signal code always gets run when TIF_RESTORE_SIGMASK is set. / static inline void set_restore_sigmask(void) { set_thread_flag(TIF_RESTORE_SIGMASK); } static inline void clear_tsk_restore_sigmask(struct task_struct task) { clear_tsk_thread_flag(task, TIF_RESTORE_SIGMASK); } static inline void clear_restore_sigmask(void) { clear_thread_flag(TIF_RESTORE_SIGMASK); } static inline bool test_tsk_restore_sigmask(struct task_struct task) { return test_tsk_thread_flag(task, TIF_RESTORE_SIGMASK); } static inline bool test_restore_sigmask(void) { return test_thread_flag(TIF_RESTORE_SIGMASK); } static inline bool test_and_clear_restore_sigmask(void) { return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK); } #else / TIF_RESTORE_SIGMASK / / Higher-quality implementation, used if TIF_RESTORE_SIGMASK doesn't exist. / static inline void set_restore_sigmask(void) { current->restore_sigmask = true; } static inline void clear_tsk_restore_sigmask(struct task_struct task) { task->restore_sigmask = false; } static inline void clear_restore_sigmask(void) { current->restore_sigmask = false; } static inline bool test_restore_sigmask(void) { return current->restore_sigmask; } static inline bool test_tsk_restore_sigmask(struct task_struct task) { return task->restore_sigmask; } static inline bool test_and_clear_restore_sigmask(void) { if (!current->restore_sigmask) return false; current->restore_sigmask = false; return true; } #endif static inline void restore_saved_sigmask(void) { if (test_and_clear_restore_sigmask()) __set_current_blocked(&current->saved_sigmask); } extern int set_user_sigmask(const sigset_t __user umask, size_t sigsetsize); static inline void restore_saved_sigmask_unless(bool interrupted) { if (interrupted) WARN_ON(!test_thread_flag(TIF_SIGPENDING)); else restore_saved_sigmask(); } static inline sigset_t sigmask_to_save(void) { sigset_t res = &current->blocked; if (unlikely(test_restore_sigmask())) res = &current->saved_sigmask; return res; } static inline int kill_cad_pid(int sig, int priv) { return kill_pid(cad_pid, sig, priv); } /* These can be the second arg to send_sig_info/send_group_sig_info. / #define SEND_SIG_NOINFO ((struct kernel_siginfo ) 0) #define SEND_SIG_PRIV ((struct kernel_siginfo ) 1) static inline int __on_sig_stack(unsigned long sp) { #ifdef CONFIG_STACK_GROWSUP return sp >= current->sas_ss_sp && sp - current->sas_ss_sp < current->sas_ss_size; #else return sp > current->sas_ss_sp && sp - current->sas_ss_sp <= current->sas_ss_size; #endif } / * True if we are on the alternate signal stack. / static inline int on_sig_stack(unsigned long sp) { / * If the signal stack is SS_AUTODISARM then, by construction, we * can't be on the signal stack unless user code deliberately set * SS_AUTODISARM when we were already on it. * * This improves reliability: if user state gets corrupted such that * the stack pointer points very close to the end of the signal stack, * then this check will enable the signal to be handled anyway. / if (current->sas_ss_flags & SS_AUTODISARM) return 0; return __on_sig_stack(sp); } static inline int sas_ss_flags(unsigned long sp) { if (!current->sas_ss_size) return SS_DISABLE; return on_sig_stack(sp) ? SS_ONSTACK : 0; } static inline void sas_ss_reset(struct task_struct p) { p->sas_ss_sp = 0; p->sas_ss_size = 0; p->sas_ss_flags = SS_DISABLE; } static inline unsigned long sigsp(unsigned long sp, struct ksignal ksig) { if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp)) #ifdef CONFIG_STACK_GROWSUP return current->sas_ss_sp; #else return current->sas_ss_sp + current->sas_ss_size; #endif return sp; } extern void __cleanup_sighand(struct sighand_struct ); extern void flush_itimer_signals(void); #define tasklist_empty() \ list_empty(&init_task.tasks) #define next_task(p) \ list_entry_rcu((p)->tasks.next, struct task_struct, tasks) #define for_each_process(p) \ for (p = &init_task ; (p = next_task(p)) != &init_task ; ) extern bool current_is_single_threaded(void); /* * Careful: do_each_thread/while_each_thread is a double loop so * 'break' will not work as expected - use goto instead. / #define do_each_thread(g, t) \ for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do #define while_each_thread(g, t) \ while ((t = next_thread(t)) != g) #define __for_each_thread(signal, t) \ list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node) #define for_each_thread(p, t) \ __for_each_thread((p)->signal, t) / Careful: this is a double loop, 'break' won't work as expected. / #define for_each_process_thread(p, t) \ for_each_process(p) for_each_thread(p, t) typedef int (proc_visitor)(struct task_struct p, void data); void walk_process_tree(struct task_struct top, proc_visitor, void ); static inline struct pid task_pid_type(struct task_struct task, enum pid_type type) { struct pid pid; if (type == PIDTYPE_PID) pid = task_pid(task); else pid = task->signal->pids[type]; return pid; } static inline struct pid task_tgid(struct task_struct task) { return task->signal->pids[PIDTYPE_TGID]; } / * Without tasklist or RCU lock it is not safe to dereference * the result of task_pgrp/task_session even if task == current, * we can race with another thread doing sys_setsid/sys_setpgid. / static inline struct pid task_pgrp(struct task_struct task) { return task->signal->pids[PIDTYPE_PGID]; } static inline struct pid task_session(struct task_struct task) { return task->signal->pids[PIDTYPE_SID]; } static inline int get_nr_threads(struct task_struct task) { return task->signal->nr_threads; } static inline bool thread_group_leader(struct task_struct p) { return p->exit_signal >= 0; } / Do to the insanities of de_thread it is possible for a process * to have the pid of the thread group leader without actually being * the thread group leader. For iteration through the pids in proc * all we care about is that we have a task with the appropriate * pid, we don't actually care if we have the right task. / static inline bool has_group_leader_pid(struct task_struct p) { return task_pid(p) == task_tgid(p); } static inline bool same_thread_group(struct task_struct p1, struct task_struct p2) { return p1->signal == p2->signal; } static inline struct task_struct next_thread(const struct task_struct p) { return list_entry_rcu(p->thread_group.next, struct task_struct, thread_group); } static inline int thread_group_empty(struct task_struct p) { return list_empty(&p->thread_group); } #define delay_group_leader(p) \ (thread_group_leader(p) && !thread_group_empty(p)) extern struct sighand_struct __lock_task_sighand(struct task_struct task, unsigned long flags); static inline struct sighand_struct lock_task_sighand(struct task_struct task, unsigned long flags) { struct sighand_struct ret; ret = __lock_task_sighand(task, flags); (void)__cond_lock(&task->sighand->siglock, ret); return ret; } static inline void unlock_task_sighand(struct task_struct task, unsigned long flags) { spin_unlock_irqrestore(&task->sighand->siglock, flags); } static inline unsigned long task_rlimit(const struct task_struct task, unsigned int limit) { return READ_ONCE(task->signal->rlim[limit].rlim_cur); } static inline unsigned long task_rlimit_max(const struct task_struct task, unsigned int limit) { return READ_ONCE(task->signal->rlim[limit].rlim_max); } static inline unsigned long rlimit(unsigned int limit) { return task_rlimit(current, limit); } static inline unsigned long rlimit_max(unsigned int limit) { return task_rlimit_max(current, limit); } #endif / _LINUX_SCHED_SIGNAL_H */

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