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- #include <linux/slab.h>
- #include <linux/export.h>
- #include <linux/init.h>
- #include <linux/sched/mm.h>
- #include <linux/sched/user.h>
- #include <linux/sched/debug.h>
- #include <linux/sched/task.h>
- #include <linux/sched/task_stack.h>
- #include <linux/sched/cputime.h>
- #include <linux/file.h>
- #include <linux/fs.h>
- #include <linux/proc_fs.h>
- #include <linux/tty.h>
- #include <linux/binfmts.h>
- #include <linux/coredump.h>
- #include <linux/security.h>
- #include <linux/syscalls.h>
- #include <linux/ptrace.h>
- #include <linux/signal.h>
- #include <linux/signalfd.h>
- #include <linux/ratelimit.h>
- #include <linux/task_work.h>
- #include <linux/capability.h>
- #include <linux/freezer.h>
- #include <linux/pid_namespace.h>
- #include <linux/nsproxy.h>
- #include <linux/user_namespace.h>
- #include <linux/uprobes.h>
- #include <linux/compat.h>
- #include <linux/cn_proc.h>
- #include <linux/compiler.h>
- #include <linux/posix-timers.h>
- #include <linux/cgroup.h>
- #include <linux/audit.h>
- #include <linux/oom.h>
- #define CREATE_TRACE_POINTS
- #include <trace/events/signal.h>
- #include <asm/param.h>
- #include <linux/uaccess.h>
- #include <asm/unistd.h>
- #include <asm/siginfo.h>
- #include <asm/cacheflush.h>
- #include <asm/syscall.h> /* for syscall_get_* */
- #undef CREATE_TRACE_POINTS
- #include <trace/hooks/signal.h>
- #include <trace/hooks/dtask.h>
- static struct kmem_cache *sigqueue_cachep;
- int print_fatal_signals __read_mostly;
- static void __user *sig_handler(struct task_struct *t, int sig)
- {
- return t->sighand->action[sig - 1].sa.sa_handler;
- }
- static inline bool sig_handler_ignored(void __user *handler, int sig)
- {
-
- return handler == SIG_IGN ||
- (handler == SIG_DFL && sig_kernel_ignore(sig));
- }
- static bool sig_task_ignored(struct task_struct *t, int sig, bool force)
- {
- void __user *handler;
- handler = sig_handler(t, sig);
-
- if (unlikely(is_global_init(t) && sig_kernel_only(sig)))
- return true;
- if (unlikely(t->signal->flags & SIGNAL_UNKILLABLE) &&
- handler == SIG_DFL && !(force && sig_kernel_only(sig)))
- return true;
-
- if (unlikely((t->flags & PF_KTHREAD) &&
- (handler == SIG_KTHREAD_KERNEL) && !force))
- return true;
- return sig_handler_ignored(handler, sig);
- }
- static bool sig_ignored(struct task_struct *t, int sig, bool force)
- {
-
- if (sigismember(&t->blocked, sig) || sigismember(&t->real_blocked, sig))
- return false;
-
- if (t->ptrace && sig != SIGKILL)
- return false;
- return sig_task_ignored(t, sig, force);
- }
- static inline bool has_pending_signals(sigset_t *signal, sigset_t *blocked)
- {
- unsigned long ready;
- long i;
- switch (_NSIG_WORDS) {
- default:
- for (i = _NSIG_WORDS, ready = 0; --i >= 0 ;)
- ready |= signal->sig[i] &~ blocked->sig[i];
- break;
- case 4: ready = signal->sig[3] &~ blocked->sig[3];
- ready |= signal->sig[2] &~ blocked->sig[2];
- ready |= signal->sig[1] &~ blocked->sig[1];
- ready |= signal->sig[0] &~ blocked->sig[0];
- break;
- case 2: ready = signal->sig[1] &~ blocked->sig[1];
- ready |= signal->sig[0] &~ blocked->sig[0];
- break;
- case 1: ready = signal->sig[0] &~ blocked->sig[0];
- }
- return ready != 0;
- }
- #define PENDING(p,b) has_pending_signals(&(p)->signal, (b))
- static bool recalc_sigpending_tsk(struct task_struct *t)
- {
- if ((t->jobctl & (JOBCTL_PENDING_MASK | JOBCTL_TRAP_FREEZE)) ||
- PENDING(&t->pending, &t->blocked) ||
- PENDING(&t->signal->shared_pending, &t->blocked) ||
- cgroup_task_frozen(t)) {
- set_tsk_thread_flag(t, TIF_SIGPENDING);
- return true;
- }
-
- return false;
- }
- void recalc_sigpending_and_wake(struct task_struct *t)
- {
- if (recalc_sigpending_tsk(t))
- signal_wake_up(t, 0);
- }
- void recalc_sigpending(void)
- {
- if (!recalc_sigpending_tsk(current) && !freezing(current))
- clear_thread_flag(TIF_SIGPENDING);
- }
- EXPORT_SYMBOL(recalc_sigpending);
- void calculate_sigpending(void)
- {
-
- spin_lock_irq(¤t->sighand->siglock);
- set_tsk_thread_flag(current, TIF_SIGPENDING);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
- }
- #define SYNCHRONOUS_MASK \
- (sigmask(SIGSEGV) | sigmask(SIGBUS) | sigmask(SIGILL) | \
- sigmask(SIGTRAP) | sigmask(SIGFPE) | sigmask(SIGSYS))
- int next_signal(struct sigpending *pending, sigset_t *mask)
- {
- unsigned long i, *s, *m, x;
- int sig = 0;
- s = pending->signal.sig;
- m = mask->sig;
-
- x = *s &~ *m;
- if (x) {
- if (x & SYNCHRONOUS_MASK)
- x &= SYNCHRONOUS_MASK;
- sig = ffz(~x) + 1;
- return sig;
- }
- switch (_NSIG_WORDS) {
- default:
- for (i = 1; i < _NSIG_WORDS; ++i) {
- x = *++s &~ *++m;
- if (!x)
- continue;
- sig = ffz(~x) + i*_NSIG_BPW + 1;
- break;
- }
- break;
- case 2:
- x = s[1] &~ m[1];
- if (!x)
- break;
- sig = ffz(~x) + _NSIG_BPW + 1;
- break;
- case 1:
-
- break;
- }
- return sig;
- }
- static inline void print_dropped_signal(int sig)
- {
- static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10);
- if (!print_fatal_signals)
- return;
- if (!__ratelimit(&ratelimit_state))
- return;
- pr_info("%s/%d: reached RLIMIT_SIGPENDING, dropped signal %d\n",
- current->comm, current->pid, sig);
- }
- bool task_set_jobctl_pending(struct task_struct *task, unsigned long mask)
- {
- BUG_ON(mask & ~(JOBCTL_PENDING_MASK | JOBCTL_STOP_CONSUME |
- JOBCTL_STOP_SIGMASK | JOBCTL_TRAPPING));
- BUG_ON((mask & JOBCTL_TRAPPING) && !(mask & JOBCTL_PENDING_MASK));
- if (unlikely(fatal_signal_pending(task) || (task->flags & PF_EXITING)))
- return false;
- if (mask & JOBCTL_STOP_SIGMASK)
- task->jobctl &= ~JOBCTL_STOP_SIGMASK;
- task->jobctl |= mask;
- return true;
- }
- void task_clear_jobctl_trapping(struct task_struct *task)
- {
- if (unlikely(task->jobctl & JOBCTL_TRAPPING)) {
- task->jobctl &= ~JOBCTL_TRAPPING;
- smp_mb();
- wake_up_bit(&task->jobctl, JOBCTL_TRAPPING_BIT);
- }
- }
- void task_clear_jobctl_pending(struct task_struct *task, unsigned long mask)
- {
- BUG_ON(mask & ~JOBCTL_PENDING_MASK);
- if (mask & JOBCTL_STOP_PENDING)
- mask |= JOBCTL_STOP_CONSUME | JOBCTL_STOP_DEQUEUED;
- task->jobctl &= ~mask;
- if (!(task->jobctl & JOBCTL_PENDING_MASK))
- task_clear_jobctl_trapping(task);
- }
- static bool task_participate_group_stop(struct task_struct *task)
- {
- struct signal_struct *sig = task->signal;
- bool consume = task->jobctl & JOBCTL_STOP_CONSUME;
- WARN_ON_ONCE(!(task->jobctl & JOBCTL_STOP_PENDING));
- task_clear_jobctl_pending(task, JOBCTL_STOP_PENDING);
- if (!consume)
- return false;
- if (!WARN_ON_ONCE(sig->group_stop_count == 0))
- sig->group_stop_count--;
-
- if (!sig->group_stop_count && !(sig->flags & SIGNAL_STOP_STOPPED)) {
- signal_set_stop_flags(sig, SIGNAL_STOP_STOPPED);
- return true;
- }
- return false;
- }
- void task_join_group_stop(struct task_struct *task)
- {
- unsigned long mask = current->jobctl & JOBCTL_STOP_SIGMASK;
- struct signal_struct *sig = current->signal;
- if (sig->group_stop_count) {
- sig->group_stop_count++;
- mask |= JOBCTL_STOP_CONSUME;
- } else if (!(sig->flags & SIGNAL_STOP_STOPPED))
- return;
-
- task_set_jobctl_pending(task, mask | JOBCTL_STOP_PENDING);
- }
- static struct sigqueue *
- __sigqueue_alloc(int sig, struct task_struct *t, gfp_t gfp_flags,
- int override_rlimit, const unsigned int sigqueue_flags)
- {
- struct sigqueue *q = NULL;
- struct ucounts *ucounts = NULL;
- long sigpending;
-
- rcu_read_lock();
- ucounts = task_ucounts(t);
- sigpending = inc_rlimit_get_ucounts(ucounts, UCOUNT_RLIMIT_SIGPENDING);
- rcu_read_unlock();
- if (!sigpending)
- return NULL;
- if (override_rlimit || likely(sigpending <= task_rlimit(t, RLIMIT_SIGPENDING))) {
- q = kmem_cache_alloc(sigqueue_cachep, gfp_flags);
- } else {
- print_dropped_signal(sig);
- }
- if (unlikely(q == NULL)) {
- dec_rlimit_put_ucounts(ucounts, UCOUNT_RLIMIT_SIGPENDING);
- } else {
- INIT_LIST_HEAD(&q->list);
- q->flags = sigqueue_flags;
- q->ucounts = ucounts;
- }
- return q;
- }
- static void __sigqueue_free(struct sigqueue *q)
- {
- if (q->flags & SIGQUEUE_PREALLOC)
- return;
- if (q->ucounts) {
- dec_rlimit_put_ucounts(q->ucounts, UCOUNT_RLIMIT_SIGPENDING);
- q->ucounts = NULL;
- }
- kmem_cache_free(sigqueue_cachep, q);
- }
- void flush_sigqueue(struct sigpending *queue)
- {
- struct sigqueue *q;
- sigemptyset(&queue->signal);
- while (!list_empty(&queue->list)) {
- q = list_entry(queue->list.next, struct sigqueue , list);
- list_del_init(&q->list);
- __sigqueue_free(q);
- }
- }
- void flush_signals(struct task_struct *t)
- {
- unsigned long flags;
- spin_lock_irqsave(&t->sighand->siglock, flags);
- clear_tsk_thread_flag(t, TIF_SIGPENDING);
- flush_sigqueue(&t->pending);
- flush_sigqueue(&t->signal->shared_pending);
- spin_unlock_irqrestore(&t->sighand->siglock, flags);
- }
- EXPORT_SYMBOL(flush_signals);
- #ifdef CONFIG_POSIX_TIMERS
- static void __flush_itimer_signals(struct sigpending *pending)
- {
- sigset_t signal, retain;
- struct sigqueue *q, *n;
- signal = pending->signal;
- sigemptyset(&retain);
- list_for_each_entry_safe(q, n, &pending->list, list) {
- int sig = q->info.si_signo;
- if (likely(q->info.si_code != SI_TIMER)) {
- sigaddset(&retain, sig);
- } else {
- sigdelset(&signal, sig);
- list_del_init(&q->list);
- __sigqueue_free(q);
- }
- }
- sigorsets(&pending->signal, &signal, &retain);
- }
- void flush_itimer_signals(void)
- {
- struct task_struct *tsk = current;
- unsigned long flags;
- spin_lock_irqsave(&tsk->sighand->siglock, flags);
- __flush_itimer_signals(&tsk->pending);
- __flush_itimer_signals(&tsk->signal->shared_pending);
- spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
- }
- #endif
- void ignore_signals(struct task_struct *t)
- {
- int i;
- for (i = 0; i < _NSIG; ++i)
- t->sighand->action[i].sa.sa_handler = SIG_IGN;
- flush_signals(t);
- }
- void
- flush_signal_handlers(struct task_struct *t, int force_default)
- {
- int i;
- struct k_sigaction *ka = &t->sighand->action[0];
- for (i = _NSIG ; i != 0 ; i--) {
- if (force_default || ka->sa.sa_handler != SIG_IGN)
- ka->sa.sa_handler = SIG_DFL;
- ka->sa.sa_flags = 0;
- #ifdef __ARCH_HAS_SA_RESTORER
- ka->sa.sa_restorer = NULL;
- #endif
- sigemptyset(&ka->sa.sa_mask);
- ka++;
- }
- }
- bool unhandled_signal(struct task_struct *tsk, int sig)
- {
- void __user *handler = tsk->sighand->action[sig-1].sa.sa_handler;
- if (is_global_init(tsk))
- return true;
- if (handler != SIG_IGN && handler != SIG_DFL)
- return false;
-
- if (fatal_signal_pending(tsk))
- return false;
-
- return !tsk->ptrace;
- }
- static void collect_signal(int sig, struct sigpending *list, kernel_siginfo_t *info,
- bool *resched_timer)
- {
- struct sigqueue *q, *first = NULL;
-
- list_for_each_entry(q, &list->list, list) {
- if (q->info.si_signo == sig) {
- if (first)
- goto still_pending;
- first = q;
- }
- }
- sigdelset(&list->signal, sig);
- if (first) {
- still_pending:
- list_del_init(&first->list);
- copy_siginfo(info, &first->info);
- *resched_timer =
- (first->flags & SIGQUEUE_PREALLOC) &&
- (info->si_code == SI_TIMER) &&
- (info->si_sys_private);
- __sigqueue_free(first);
- } else {
-
- clear_siginfo(info);
- info->si_signo = sig;
- info->si_errno = 0;
- info->si_code = SI_USER;
- info->si_pid = 0;
- info->si_uid = 0;
- }
- }
- static int __dequeue_signal(struct sigpending *pending, sigset_t *mask,
- kernel_siginfo_t *info, bool *resched_timer)
- {
- int sig = next_signal(pending, mask);
- if (sig)
- collect_signal(sig, pending, info, resched_timer);
- return sig;
- }
- int dequeue_signal(struct task_struct *tsk, sigset_t *mask,
- kernel_siginfo_t *info, enum pid_type *type)
- {
- bool resched_timer = false;
- int signr;
-
- *type = PIDTYPE_PID;
- signr = __dequeue_signal(&tsk->pending, mask, info, &resched_timer);
- if (!signr) {
- *type = PIDTYPE_TGID;
- signr = __dequeue_signal(&tsk->signal->shared_pending,
- mask, info, &resched_timer);
- #ifdef CONFIG_POSIX_TIMERS
-
- if (unlikely(signr == SIGALRM)) {
- struct hrtimer *tmr = &tsk->signal->real_timer;
- if (!hrtimer_is_queued(tmr) &&
- tsk->signal->it_real_incr != 0) {
- hrtimer_forward(tmr, tmr->base->get_time(),
- tsk->signal->it_real_incr);
- hrtimer_restart(tmr);
- }
- }
- #endif
- }
- recalc_sigpending();
- if (!signr)
- return 0;
- if (unlikely(sig_kernel_stop(signr))) {
-
- current->jobctl |= JOBCTL_STOP_DEQUEUED;
- }
- #ifdef CONFIG_POSIX_TIMERS
- if (resched_timer) {
-
- spin_unlock(&tsk->sighand->siglock);
- posixtimer_rearm(info);
- spin_lock(&tsk->sighand->siglock);
-
- info->si_sys_private = 0;
- }
- #endif
- return signr;
- }
- EXPORT_SYMBOL_GPL(dequeue_signal);
- static int dequeue_synchronous_signal(kernel_siginfo_t *info)
- {
- struct task_struct *tsk = current;
- struct sigpending *pending = &tsk->pending;
- struct sigqueue *q, *sync = NULL;
-
- if (!((pending->signal.sig[0] & ~tsk->blocked.sig[0]) & SYNCHRONOUS_MASK))
- return 0;
-
- list_for_each_entry(q, &pending->list, list) {
-
- if ((q->info.si_code > SI_USER) &&
- (sigmask(q->info.si_signo) & SYNCHRONOUS_MASK)) {
- sync = q;
- goto next;
- }
- }
- return 0;
- next:
-
- list_for_each_entry_continue(q, &pending->list, list) {
- if (q->info.si_signo == sync->info.si_signo)
- goto still_pending;
- }
- sigdelset(&pending->signal, sync->info.si_signo);
- recalc_sigpending();
- still_pending:
- list_del_init(&sync->list);
- copy_siginfo(info, &sync->info);
- __sigqueue_free(sync);
- return info->si_signo;
- }
- void signal_wake_up_state(struct task_struct *t, unsigned int state)
- {
- lockdep_assert_held(&t->sighand->siglock);
- set_tsk_thread_flag(t, TIF_SIGPENDING);
-
- if (!wake_up_state(t, state | TASK_INTERRUPTIBLE))
- kick_process(t);
- }
- static void flush_sigqueue_mask(sigset_t *mask, struct sigpending *s)
- {
- struct sigqueue *q, *n;
- sigset_t m;
- sigandsets(&m, mask, &s->signal);
- if (sigisemptyset(&m))
- return;
- sigandnsets(&s->signal, &s->signal, mask);
- list_for_each_entry_safe(q, n, &s->list, list) {
- if (sigismember(mask, q->info.si_signo)) {
- list_del_init(&q->list);
- __sigqueue_free(q);
- }
- }
- }
- static inline int is_si_special(const struct kernel_siginfo *info)
- {
- return info <= SEND_SIG_PRIV;
- }
- static inline bool si_fromuser(const struct kernel_siginfo *info)
- {
- return info == SEND_SIG_NOINFO ||
- (!is_si_special(info) && SI_FROMUSER(info));
- }
- static bool kill_ok_by_cred(struct task_struct *t)
- {
- const struct cred *cred = current_cred();
- const struct cred *tcred = __task_cred(t);
- return uid_eq(cred->euid, tcred->suid) ||
- uid_eq(cred->euid, tcred->uid) ||
- uid_eq(cred->uid, tcred->suid) ||
- uid_eq(cred->uid, tcred->uid) ||
- ns_capable(tcred->user_ns, CAP_KILL);
- }
- static int check_kill_permission(int sig, struct kernel_siginfo *info,
- struct task_struct *t)
- {
- struct pid *sid;
- int error;
- if (!valid_signal(sig))
- return -EINVAL;
- if (!si_fromuser(info))
- return 0;
- error = audit_signal_info(sig, t);
- if (error)
- return error;
- if (!same_thread_group(current, t) &&
- !kill_ok_by_cred(t)) {
- switch (sig) {
- case SIGCONT:
- sid = task_session(t);
-
- if (!sid || sid == task_session(current))
- break;
- fallthrough;
- default:
- return -EPERM;
- }
- }
- return security_task_kill(t, info, sig, NULL);
- }
- static void ptrace_trap_notify(struct task_struct *t)
- {
- WARN_ON_ONCE(!(t->ptrace & PT_SEIZED));
- lockdep_assert_held(&t->sighand->siglock);
- task_set_jobctl_pending(t, JOBCTL_TRAP_NOTIFY);
- ptrace_signal_wake_up(t, t->jobctl & JOBCTL_LISTENING);
- }
- static bool prepare_signal(int sig, struct task_struct *p, bool force)
- {
- struct signal_struct *signal = p->signal;
- struct task_struct *t;
- sigset_t flush;
- if (signal->flags & SIGNAL_GROUP_EXIT) {
- if (signal->core_state)
- return sig == SIGKILL;
-
- return false;
- } else if (sig_kernel_stop(sig)) {
-
- siginitset(&flush, sigmask(SIGCONT));
- flush_sigqueue_mask(&flush, &signal->shared_pending);
- for_each_thread(p, t)
- flush_sigqueue_mask(&flush, &t->pending);
- } else if (sig == SIGCONT) {
- unsigned int why;
-
- siginitset(&flush, SIG_KERNEL_STOP_MASK);
- flush_sigqueue_mask(&flush, &signal->shared_pending);
- for_each_thread(p, t) {
- flush_sigqueue_mask(&flush, &t->pending);
- task_clear_jobctl_pending(t, JOBCTL_STOP_PENDING);
- if (likely(!(t->ptrace & PT_SEIZED))) {
- t->jobctl &= ~JOBCTL_STOPPED;
- wake_up_state(t, __TASK_STOPPED);
- } else
- ptrace_trap_notify(t);
- }
-
- why = 0;
- if (signal->flags & SIGNAL_STOP_STOPPED)
- why |= SIGNAL_CLD_CONTINUED;
- else if (signal->group_stop_count)
- why |= SIGNAL_CLD_STOPPED;
- if (why) {
-
- signal_set_stop_flags(signal, why | SIGNAL_STOP_CONTINUED);
- signal->group_stop_count = 0;
- signal->group_exit_code = 0;
- }
- }
- return !sig_ignored(p, sig, force);
- }
- static inline bool wants_signal(int sig, struct task_struct *p)
- {
- if (sigismember(&p->blocked, sig))
- return false;
- if (p->flags & PF_EXITING)
- return false;
- if (sig == SIGKILL)
- return true;
- if (task_is_stopped_or_traced(p))
- return false;
- return task_curr(p) || !task_sigpending(p);
- }
- static void complete_signal(int sig, struct task_struct *p, enum pid_type type)
- {
- struct signal_struct *signal = p->signal;
- struct task_struct *t;
- bool wake;
-
- if (wants_signal(sig, p))
- t = p;
- else if ((type == PIDTYPE_PID) || thread_group_empty(p))
-
- return;
- else {
-
- t = signal->curr_target;
- while (!wants_signal(sig, t)) {
- t = next_thread(t);
- if (t == signal->curr_target)
-
- return;
- }
- signal->curr_target = t;
- }
-
- if (sig_fatal(p, sig) &&
- (signal->core_state || !(signal->flags & SIGNAL_GROUP_EXIT)) &&
- !sigismember(&t->real_blocked, sig) &&
- (sig == SIGKILL || !p->ptrace)) {
-
- if (!sig_kernel_coredump(sig)) {
-
- signal->flags = SIGNAL_GROUP_EXIT;
- signal->group_exit_code = sig;
- signal->group_stop_count = 0;
- t = p;
- do {
- trace_android_vh_exit_signal(t);
- task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK);
- sigaddset(&t->pending.signal, SIGKILL);
- wake = true;
- trace_android_vh_exit_signal_whether_wake(t, &wake);
- if (wake)
- signal_wake_up(t, 1);
- } while_each_thread(p, t);
- return;
- }
- }
-
- signal_wake_up(t, sig == SIGKILL);
- return;
- }
- static inline bool legacy_queue(struct sigpending *signals, int sig)
- {
- return (sig < SIGRTMIN) && sigismember(&signals->signal, sig);
- }
- static int __send_signal_locked(int sig, struct kernel_siginfo *info,
- struct task_struct *t, enum pid_type type, bool force)
- {
- struct sigpending *pending;
- struct sigqueue *q;
- int override_rlimit;
- int ret = 0, result;
- lockdep_assert_held(&t->sighand->siglock);
- result = TRACE_SIGNAL_IGNORED;
- if (!prepare_signal(sig, t, force))
- goto ret;
- pending = (type != PIDTYPE_PID) ? &t->signal->shared_pending : &t->pending;
-
- result = TRACE_SIGNAL_ALREADY_PENDING;
- if (legacy_queue(pending, sig))
- goto ret;
- result = TRACE_SIGNAL_DELIVERED;
-
- if ((sig == SIGKILL) || (t->flags & PF_KTHREAD))
- goto out_set;
-
- if (sig < SIGRTMIN)
- override_rlimit = (is_si_special(info) || info->si_code >= 0);
- else
- override_rlimit = 0;
- q = __sigqueue_alloc(sig, t, GFP_ATOMIC, override_rlimit, 0);
- if (q) {
- list_add_tail(&q->list, &pending->list);
- switch ((unsigned long) info) {
- case (unsigned long) SEND_SIG_NOINFO:
- clear_siginfo(&q->info);
- q->info.si_signo = sig;
- q->info.si_errno = 0;
- q->info.si_code = SI_USER;
- q->info.si_pid = task_tgid_nr_ns(current,
- task_active_pid_ns(t));
- rcu_read_lock();
- q->info.si_uid =
- from_kuid_munged(task_cred_xxx(t, user_ns),
- current_uid());
- rcu_read_unlock();
- break;
- case (unsigned long) SEND_SIG_PRIV:
- clear_siginfo(&q->info);
- q->info.si_signo = sig;
- q->info.si_errno = 0;
- q->info.si_code = SI_KERNEL;
- q->info.si_pid = 0;
- q->info.si_uid = 0;
- break;
- default:
- copy_siginfo(&q->info, info);
- break;
- }
- } else if (!is_si_special(info) &&
- sig >= SIGRTMIN && info->si_code != SI_USER) {
-
- result = TRACE_SIGNAL_OVERFLOW_FAIL;
- ret = -EAGAIN;
- goto ret;
- } else {
-
- result = TRACE_SIGNAL_LOSE_INFO;
- }
- out_set:
- signalfd_notify(t, sig);
- sigaddset(&pending->signal, sig);
-
- if (type > PIDTYPE_TGID) {
- struct multiprocess_signals *delayed;
- hlist_for_each_entry(delayed, &t->signal->multiprocess, node) {
- sigset_t *signal = &delayed->signal;
-
- if (sig == SIGCONT)
- sigdelsetmask(signal, SIG_KERNEL_STOP_MASK);
- else if (sig_kernel_stop(sig))
- sigdelset(signal, SIGCONT);
- sigaddset(signal, sig);
- }
- }
- complete_signal(sig, t, type);
- ret:
- trace_signal_generate(sig, info, t, type != PIDTYPE_PID, result);
- return ret;
- }
- static inline bool has_si_pid_and_uid(struct kernel_siginfo *info)
- {
- bool ret = false;
- switch (siginfo_layout(info->si_signo, info->si_code)) {
- case SIL_KILL:
- case SIL_CHLD:
- case SIL_RT:
- ret = true;
- break;
- case SIL_TIMER:
- case SIL_POLL:
- case SIL_FAULT:
- case SIL_FAULT_TRAPNO:
- case SIL_FAULT_MCEERR:
- case SIL_FAULT_BNDERR:
- case SIL_FAULT_PKUERR:
- case SIL_FAULT_PERF_EVENT:
- case SIL_SYS:
- ret = false;
- break;
- }
- return ret;
- }
- int send_signal_locked(int sig, struct kernel_siginfo *info,
- struct task_struct *t, enum pid_type type)
- {
-
- bool force = false;
- if (info == SEND_SIG_NOINFO) {
-
- force = !task_pid_nr_ns(current, task_active_pid_ns(t));
- } else if (info == SEND_SIG_PRIV) {
-
- force = true;
- } else if (has_si_pid_and_uid(info)) {
-
- struct user_namespace *t_user_ns;
- rcu_read_lock();
- t_user_ns = task_cred_xxx(t, user_ns);
- if (current_user_ns() != t_user_ns) {
- kuid_t uid = make_kuid(current_user_ns(), info->si_uid);
- info->si_uid = from_kuid_munged(t_user_ns, uid);
- }
- rcu_read_unlock();
-
- force = (info->si_code == SI_KERNEL);
-
- if (!task_pid_nr_ns(current, task_active_pid_ns(t))) {
- info->si_pid = 0;
- force = true;
- }
- }
- return __send_signal_locked(sig, info, t, type, force);
- }
- static void print_fatal_signal(int signr)
- {
- struct pt_regs *regs = signal_pt_regs();
- pr_info("potentially unexpected fatal signal %d.\n", signr);
- #if defined(__i386__) && !defined(__arch_um__)
- pr_info("code at %08lx: ", regs->ip);
- {
- int i;
- for (i = 0; i < 16; i++) {
- unsigned char insn;
- if (get_user(insn, (unsigned char *)(regs->ip + i)))
- break;
- pr_cont("%02x ", insn);
- }
- }
- pr_cont("\n");
- #endif
- preempt_disable();
- show_regs(regs);
- preempt_enable();
- }
- static int __init setup_print_fatal_signals(char *str)
- {
- get_option (&str, &print_fatal_signals);
- return 1;
- }
- __setup("print-fatal-signals=", setup_print_fatal_signals);
- int do_send_sig_info(int sig, struct kernel_siginfo *info, struct task_struct *p,
- enum pid_type type)
- {
- unsigned long flags;
- int ret = -ESRCH;
- trace_android_vh_do_send_sig_info(sig, current, p);
- if (lock_task_sighand(p, &flags)) {
- ret = send_signal_locked(sig, info, p, type);
- unlock_task_sighand(p, &flags);
- }
- return ret;
- }
- enum sig_handler {
- HANDLER_CURRENT,
- HANDLER_SIG_DFL,
- HANDLER_EXIT,
- };
- static int
- force_sig_info_to_task(struct kernel_siginfo *info, struct task_struct *t,
- enum sig_handler handler)
- {
- unsigned long int flags;
- int ret, blocked, ignored;
- struct k_sigaction *action;
- int sig = info->si_signo;
- spin_lock_irqsave(&t->sighand->siglock, flags);
- action = &t->sighand->action[sig-1];
- ignored = action->sa.sa_handler == SIG_IGN;
- blocked = sigismember(&t->blocked, sig);
- if (blocked || ignored || (handler != HANDLER_CURRENT)) {
- action->sa.sa_handler = SIG_DFL;
- if (handler == HANDLER_EXIT)
- action->sa.sa_flags |= SA_IMMUTABLE;
- if (blocked) {
- sigdelset(&t->blocked, sig);
- recalc_sigpending_and_wake(t);
- }
- }
-
- if (action->sa.sa_handler == SIG_DFL &&
- (!t->ptrace || (handler == HANDLER_EXIT)))
- t->signal->flags &= ~SIGNAL_UNKILLABLE;
- ret = send_signal_locked(sig, info, t, PIDTYPE_PID);
- spin_unlock_irqrestore(&t->sighand->siglock, flags);
- return ret;
- }
- int force_sig_info(struct kernel_siginfo *info)
- {
- return force_sig_info_to_task(info, current, HANDLER_CURRENT);
- }
- int zap_other_threads(struct task_struct *p)
- {
- struct task_struct *t = p;
- int count = 0;
- p->signal->group_stop_count = 0;
- while_each_thread(p, t) {
- task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK);
- count++;
-
- if (t->exit_state)
- continue;
- sigaddset(&t->pending.signal, SIGKILL);
- signal_wake_up(t, 1);
- }
- return count;
- }
- struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
- unsigned long *flags)
- {
- struct sighand_struct *sighand;
- rcu_read_lock();
- for (;;) {
- sighand = rcu_dereference(tsk->sighand);
- if (unlikely(sighand == NULL))
- break;
-
- spin_lock_irqsave(&sighand->siglock, *flags);
- if (likely(sighand == rcu_access_pointer(tsk->sighand)))
- break;
- spin_unlock_irqrestore(&sighand->siglock, *flags);
- }
- rcu_read_unlock();
- return sighand;
- }
- #ifdef CONFIG_LOCKDEP
- void lockdep_assert_task_sighand_held(struct task_struct *task)
- {
- struct sighand_struct *sighand;
- rcu_read_lock();
- sighand = rcu_dereference(task->sighand);
- if (sighand)
- lockdep_assert_held(&sighand->siglock);
- else
- WARN_ON_ONCE(1);
- rcu_read_unlock();
- }
- #endif
- int group_send_sig_info(int sig, struct kernel_siginfo *info,
- struct task_struct *p, enum pid_type type)
- {
- int ret;
- rcu_read_lock();
- ret = check_kill_permission(sig, info, p);
- rcu_read_unlock();
- if (!ret && sig) {
- ret = do_send_sig_info(sig, info, p, type);
- if (!ret && sig == SIGKILL) {
- bool reap = false;
- trace_android_vh_killed_process(current, p, &reap);
- if (reap)
- add_to_oom_reaper(p);
- }
- }
- return ret;
- }
- int __kill_pgrp_info(int sig, struct kernel_siginfo *info, struct pid *pgrp)
- {
- struct task_struct *p = NULL;
- int retval, success;
- success = 0;
- retval = -ESRCH;
- do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
- int err = group_send_sig_info(sig, info, p, PIDTYPE_PGID);
- success |= !err;
- retval = err;
- } while_each_pid_task(pgrp, PIDTYPE_PGID, p);
- return success ? 0 : retval;
- }
- int kill_pid_info(int sig, struct kernel_siginfo *info, struct pid *pid)
- {
- int error = -ESRCH;
- struct task_struct *p;
- for (;;) {
- rcu_read_lock();
- p = pid_task(pid, PIDTYPE_PID);
- if (p)
- error = group_send_sig_info(sig, info, p, PIDTYPE_TGID);
- rcu_read_unlock();
- if (likely(!p || error != -ESRCH))
- return error;
-
- }
- }
- static int kill_proc_info(int sig, struct kernel_siginfo *info, pid_t pid)
- {
- int error;
- rcu_read_lock();
- error = kill_pid_info(sig, info, find_vpid(pid));
- rcu_read_unlock();
- return error;
- }
- static inline bool kill_as_cred_perm(const struct cred *cred,
- struct task_struct *target)
- {
- const struct cred *pcred = __task_cred(target);
- return uid_eq(cred->euid, pcred->suid) ||
- uid_eq(cred->euid, pcred->uid) ||
- uid_eq(cred->uid, pcred->suid) ||
- uid_eq(cred->uid, pcred->uid);
- }
- int kill_pid_usb_asyncio(int sig, int errno, sigval_t addr,
- struct pid *pid, const struct cred *cred)
- {
- struct kernel_siginfo info;
- struct task_struct *p;
- unsigned long flags;
- int ret = -EINVAL;
- if (!valid_signal(sig))
- return ret;
- clear_siginfo(&info);
- info.si_signo = sig;
- info.si_errno = errno;
- info.si_code = SI_ASYNCIO;
- *((sigval_t *)&info.si_pid) = addr;
- rcu_read_lock();
- p = pid_task(pid, PIDTYPE_PID);
- if (!p) {
- ret = -ESRCH;
- goto out_unlock;
- }
- if (!kill_as_cred_perm(cred, p)) {
- ret = -EPERM;
- goto out_unlock;
- }
- ret = security_task_kill(p, &info, sig, cred);
- if (ret)
- goto out_unlock;
- if (sig) {
- if (lock_task_sighand(p, &flags)) {
- ret = __send_signal_locked(sig, &info, p, PIDTYPE_TGID, false);
- unlock_task_sighand(p, &flags);
- } else
- ret = -ESRCH;
- }
- out_unlock:
- rcu_read_unlock();
- return ret;
- }
- EXPORT_SYMBOL_GPL(kill_pid_usb_asyncio);
- static int kill_something_info(int sig, struct kernel_siginfo *info, pid_t pid)
- {
- int ret;
- if (pid > 0)
- return kill_proc_info(sig, info, pid);
-
- if (pid == INT_MIN)
- return -ESRCH;
- read_lock(&tasklist_lock);
- if (pid != -1) {
- ret = __kill_pgrp_info(sig, info,
- pid ? find_vpid(-pid) : task_pgrp(current));
- } else {
- int retval = 0, count = 0;
- struct task_struct * p;
- for_each_process(p) {
- if (task_pid_vnr(p) > 1 &&
- !same_thread_group(p, current)) {
- int err = group_send_sig_info(sig, info, p,
- PIDTYPE_MAX);
- ++count;
- if (err != -EPERM)
- retval = err;
- }
- }
- ret = count ? retval : -ESRCH;
- }
- read_unlock(&tasklist_lock);
- return ret;
- }
- int send_sig_info(int sig, struct kernel_siginfo *info, struct task_struct *p)
- {
-
- if (!valid_signal(sig))
- return -EINVAL;
- return do_send_sig_info(sig, info, p, PIDTYPE_PID);
- }
- EXPORT_SYMBOL(send_sig_info);
- #define __si_special(priv) \
- ((priv) ? SEND_SIG_PRIV : SEND_SIG_NOINFO)
- int
- send_sig(int sig, struct task_struct *p, int priv)
- {
- return send_sig_info(sig, __si_special(priv), p);
- }
- EXPORT_SYMBOL(send_sig);
- void force_sig(int sig)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = sig;
- info.si_errno = 0;
- info.si_code = SI_KERNEL;
- info.si_pid = 0;
- info.si_uid = 0;
- force_sig_info(&info);
- }
- EXPORT_SYMBOL(force_sig);
- void force_fatal_sig(int sig)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = sig;
- info.si_errno = 0;
- info.si_code = SI_KERNEL;
- info.si_pid = 0;
- info.si_uid = 0;
- force_sig_info_to_task(&info, current, HANDLER_SIG_DFL);
- }
- void force_exit_sig(int sig)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = sig;
- info.si_errno = 0;
- info.si_code = SI_KERNEL;
- info.si_pid = 0;
- info.si_uid = 0;
- force_sig_info_to_task(&info, current, HANDLER_EXIT);
- }
- void force_sigsegv(int sig)
- {
- if (sig == SIGSEGV)
- force_fatal_sig(SIGSEGV);
- else
- force_sig(SIGSEGV);
- }
- int force_sig_fault_to_task(int sig, int code, void __user *addr
- ___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr)
- , struct task_struct *t)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = sig;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = addr;
- #ifdef __ia64__
- info.si_imm = imm;
- info.si_flags = flags;
- info.si_isr = isr;
- #endif
- return force_sig_info_to_task(&info, t, HANDLER_CURRENT);
- }
- int force_sig_fault(int sig, int code, void __user *addr
- ___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr))
- {
- return force_sig_fault_to_task(sig, code, addr
- ___ARCH_SI_IA64(imm, flags, isr), current);
- }
- int send_sig_fault(int sig, int code, void __user *addr
- ___ARCH_SI_IA64(int imm, unsigned int flags, unsigned long isr)
- , struct task_struct *t)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = sig;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = addr;
- #ifdef __ia64__
- info.si_imm = imm;
- info.si_flags = flags;
- info.si_isr = isr;
- #endif
- return send_sig_info(info.si_signo, &info, t);
- }
- int force_sig_mceerr(int code, void __user *addr, short lsb)
- {
- struct kernel_siginfo info;
- WARN_ON((code != BUS_MCEERR_AO) && (code != BUS_MCEERR_AR));
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = addr;
- info.si_addr_lsb = lsb;
- return force_sig_info(&info);
- }
- int send_sig_mceerr(int code, void __user *addr, short lsb, struct task_struct *t)
- {
- struct kernel_siginfo info;
- WARN_ON((code != BUS_MCEERR_AO) && (code != BUS_MCEERR_AR));
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = addr;
- info.si_addr_lsb = lsb;
- return send_sig_info(info.si_signo, &info, t);
- }
- EXPORT_SYMBOL(send_sig_mceerr);
- int force_sig_bnderr(void __user *addr, void __user *lower, void __user *upper)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = SEGV_BNDERR;
- info.si_addr = addr;
- info.si_lower = lower;
- info.si_upper = upper;
- return force_sig_info(&info);
- }
- #ifdef SEGV_PKUERR
- int force_sig_pkuerr(void __user *addr, u32 pkey)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = SEGV_PKUERR;
- info.si_addr = addr;
- info.si_pkey = pkey;
- return force_sig_info(&info);
- }
- #endif
- int send_sig_perf(void __user *addr, u32 type, u64 sig_data)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
- info.si_code = TRAP_PERF;
- info.si_addr = addr;
- info.si_perf_data = sig_data;
- info.si_perf_type = type;
-
- info.si_perf_flags = sigismember(¤t->blocked, info.si_signo) ?
- TRAP_PERF_FLAG_ASYNC :
- 0;
- return send_sig_info(info.si_signo, &info, current);
- }
- int force_sig_seccomp(int syscall, int reason, bool force_coredump)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = SIGSYS;
- info.si_code = SYS_SECCOMP;
- info.si_call_addr = (void __user *)KSTK_EIP(current);
- info.si_errno = reason;
- info.si_arch = syscall_get_arch(current);
- info.si_syscall = syscall;
- return force_sig_info_to_task(&info, current,
- force_coredump ? HANDLER_EXIT : HANDLER_CURRENT);
- }
- int force_sig_ptrace_errno_trap(int errno, void __user *addr)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = SIGTRAP;
- info.si_errno = errno;
- info.si_code = TRAP_HWBKPT;
- info.si_addr = addr;
- return force_sig_info(&info);
- }
- int force_sig_fault_trapno(int sig, int code, void __user *addr, int trapno)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = sig;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = addr;
- info.si_trapno = trapno;
- return force_sig_info(&info);
- }
- int send_sig_fault_trapno(int sig, int code, void __user *addr, int trapno,
- struct task_struct *t)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = sig;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = addr;
- info.si_trapno = trapno;
- return send_sig_info(info.si_signo, &info, t);
- }
- int kill_pgrp(struct pid *pid, int sig, int priv)
- {
- int ret;
- read_lock(&tasklist_lock);
- ret = __kill_pgrp_info(sig, __si_special(priv), pid);
- read_unlock(&tasklist_lock);
- return ret;
- }
- EXPORT_SYMBOL(kill_pgrp);
- int kill_pid(struct pid *pid, int sig, int priv)
- {
- return kill_pid_info(sig, __si_special(priv), pid);
- }
- EXPORT_SYMBOL(kill_pid);
- struct sigqueue *sigqueue_alloc(void)
- {
- return __sigqueue_alloc(-1, current, GFP_KERNEL, 0, SIGQUEUE_PREALLOC);
- }
- void sigqueue_free(struct sigqueue *q)
- {
- unsigned long flags;
- spinlock_t *lock = ¤t->sighand->siglock;
- BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
-
- spin_lock_irqsave(lock, flags);
- q->flags &= ~SIGQUEUE_PREALLOC;
-
- if (!list_empty(&q->list))
- q = NULL;
- spin_unlock_irqrestore(lock, flags);
- if (q)
- __sigqueue_free(q);
- }
- int send_sigqueue(struct sigqueue *q, struct pid *pid, enum pid_type type)
- {
- int sig = q->info.si_signo;
- struct sigpending *pending;
- struct task_struct *t;
- unsigned long flags;
- int ret, result;
- BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
- ret = -1;
- rcu_read_lock();
- t = pid_task(pid, type);
- if (!t || !likely(lock_task_sighand(t, &flags)))
- goto ret;
- ret = 1;
- result = TRACE_SIGNAL_IGNORED;
- if (!prepare_signal(sig, t, false))
- goto out;
- ret = 0;
- if (unlikely(!list_empty(&q->list))) {
-
- BUG_ON(q->info.si_code != SI_TIMER);
- q->info.si_overrun++;
- result = TRACE_SIGNAL_ALREADY_PENDING;
- goto out;
- }
- q->info.si_overrun = 0;
- signalfd_notify(t, sig);
- pending = (type != PIDTYPE_PID) ? &t->signal->shared_pending : &t->pending;
- list_add_tail(&q->list, &pending->list);
- sigaddset(&pending->signal, sig);
- complete_signal(sig, t, type);
- result = TRACE_SIGNAL_DELIVERED;
- out:
- trace_signal_generate(sig, &q->info, t, type != PIDTYPE_PID, result);
- unlock_task_sighand(t, &flags);
- ret:
- rcu_read_unlock();
- return ret;
- }
- static void do_notify_pidfd(struct task_struct *task)
- {
- struct pid *pid;
- WARN_ON(task->exit_state == 0);
- pid = task_pid(task);
- wake_up_all(&pid->wait_pidfd);
- }
- bool do_notify_parent(struct task_struct *tsk, int sig)
- {
- struct kernel_siginfo info;
- unsigned long flags;
- struct sighand_struct *psig;
- bool autoreap = false;
- u64 utime, stime;
- WARN_ON_ONCE(sig == -1);
-
- WARN_ON_ONCE(task_is_stopped_or_traced(tsk));
- WARN_ON_ONCE(!tsk->ptrace &&
- (tsk->group_leader != tsk || !thread_group_empty(tsk)));
-
- do_notify_pidfd(tsk);
- if (sig != SIGCHLD) {
-
- if (tsk->parent_exec_id != READ_ONCE(tsk->parent->self_exec_id))
- sig = SIGCHLD;
- }
- clear_siginfo(&info);
- info.si_signo = sig;
- info.si_errno = 0;
-
- rcu_read_lock();
- info.si_pid = task_pid_nr_ns(tsk, task_active_pid_ns(tsk->parent));
- info.si_uid = from_kuid_munged(task_cred_xxx(tsk->parent, user_ns),
- task_uid(tsk));
- rcu_read_unlock();
- task_cputime(tsk, &utime, &stime);
- info.si_utime = nsec_to_clock_t(utime + tsk->signal->utime);
- info.si_stime = nsec_to_clock_t(stime + tsk->signal->stime);
- info.si_status = tsk->exit_code & 0x7f;
- if (tsk->exit_code & 0x80)
- info.si_code = CLD_DUMPED;
- else if (tsk->exit_code & 0x7f)
- info.si_code = CLD_KILLED;
- else {
- info.si_code = CLD_EXITED;
- info.si_status = tsk->exit_code >> 8;
- }
- psig = tsk->parent->sighand;
- spin_lock_irqsave(&psig->siglock, flags);
- if (!tsk->ptrace && sig == SIGCHLD &&
- (psig->action[SIGCHLD-1].sa.sa_handler == SIG_IGN ||
- (psig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT))) {
-
- autoreap = true;
- if (psig->action[SIGCHLD-1].sa.sa_handler == SIG_IGN)
- sig = 0;
- }
-
- if (valid_signal(sig) && sig)
- __send_signal_locked(sig, &info, tsk->parent, PIDTYPE_TGID, false);
- __wake_up_parent(tsk, tsk->parent);
- spin_unlock_irqrestore(&psig->siglock, flags);
- return autoreap;
- }
- static void do_notify_parent_cldstop(struct task_struct *tsk,
- bool for_ptracer, int why)
- {
- struct kernel_siginfo info;
- unsigned long flags;
- struct task_struct *parent;
- struct sighand_struct *sighand;
- u64 utime, stime;
- if (for_ptracer) {
- parent = tsk->parent;
- } else {
- tsk = tsk->group_leader;
- parent = tsk->real_parent;
- }
- clear_siginfo(&info);
- info.si_signo = SIGCHLD;
- info.si_errno = 0;
-
- rcu_read_lock();
- info.si_pid = task_pid_nr_ns(tsk, task_active_pid_ns(parent));
- info.si_uid = from_kuid_munged(task_cred_xxx(parent, user_ns), task_uid(tsk));
- rcu_read_unlock();
- task_cputime(tsk, &utime, &stime);
- info.si_utime = nsec_to_clock_t(utime);
- info.si_stime = nsec_to_clock_t(stime);
- info.si_code = why;
- switch (why) {
- case CLD_CONTINUED:
- info.si_status = SIGCONT;
- break;
- case CLD_STOPPED:
- info.si_status = tsk->signal->group_exit_code & 0x7f;
- break;
- case CLD_TRAPPED:
- info.si_status = tsk->exit_code & 0x7f;
- break;
- default:
- BUG();
- }
- sighand = parent->sighand;
- spin_lock_irqsave(&sighand->siglock, flags);
- if (sighand->action[SIGCHLD-1].sa.sa_handler != SIG_IGN &&
- !(sighand->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDSTOP))
- send_signal_locked(SIGCHLD, &info, parent, PIDTYPE_TGID);
-
- __wake_up_parent(tsk, parent);
- spin_unlock_irqrestore(&sighand->siglock, flags);
- }
- static int ptrace_stop(int exit_code, int why, unsigned long message,
- kernel_siginfo_t *info)
- __releases(¤t->sighand->siglock)
- __acquires(¤t->sighand->siglock)
- {
- bool gstop_done = false;
- if (arch_ptrace_stop_needed()) {
-
- spin_unlock_irq(¤t->sighand->siglock);
- arch_ptrace_stop();
- spin_lock_irq(¤t->sighand->siglock);
- }
-
- if (!current->ptrace || __fatal_signal_pending(current))
- return exit_code;
- set_special_state(TASK_TRACED);
- current->jobctl |= JOBCTL_TRACED;
-
- smp_wmb();
- current->ptrace_message = message;
- current->last_siginfo = info;
- current->exit_code = exit_code;
-
- if (why == CLD_STOPPED && (current->jobctl & JOBCTL_STOP_PENDING))
- gstop_done = task_participate_group_stop(current);
-
- task_clear_jobctl_pending(current, JOBCTL_TRAP_STOP);
- if (info && info->si_code >> 8 == PTRACE_EVENT_STOP)
- task_clear_jobctl_pending(current, JOBCTL_TRAP_NOTIFY);
-
- task_clear_jobctl_trapping(current);
- spin_unlock_irq(¤t->sighand->siglock);
- read_lock(&tasklist_lock);
-
- if (current->ptrace)
- do_notify_parent_cldstop(current, true, why);
- if (gstop_done && (!current->ptrace || ptrace_reparented(current)))
- do_notify_parent_cldstop(current, false, why);
-
- preempt_disable();
- read_unlock(&tasklist_lock);
- cgroup_enter_frozen();
- preempt_enable_no_resched();
- schedule();
- cgroup_leave_frozen(true);
-
- spin_lock_irq(¤t->sighand->siglock);
- exit_code = current->exit_code;
- current->last_siginfo = NULL;
- current->ptrace_message = 0;
- current->exit_code = 0;
-
- current->jobctl &= ~(JOBCTL_LISTENING | JOBCTL_PTRACE_FROZEN);
-
- recalc_sigpending_tsk(current);
- return exit_code;
- }
- static int ptrace_do_notify(int signr, int exit_code, int why, unsigned long message)
- {
- kernel_siginfo_t info;
- clear_siginfo(&info);
- info.si_signo = signr;
- info.si_code = exit_code;
- info.si_pid = task_pid_vnr(current);
- info.si_uid = from_kuid_munged(current_user_ns(), current_uid());
-
- return ptrace_stop(exit_code, why, message, &info);
- }
- int ptrace_notify(int exit_code, unsigned long message)
- {
- int signr;
- BUG_ON((exit_code & (0x7f | ~0xffff)) != SIGTRAP);
- if (unlikely(task_work_pending(current)))
- task_work_run();
- spin_lock_irq(¤t->sighand->siglock);
- signr = ptrace_do_notify(SIGTRAP, exit_code, CLD_TRAPPED, message);
- spin_unlock_irq(¤t->sighand->siglock);
- return signr;
- }
- static bool do_signal_stop(int signr)
- __releases(¤t->sighand->siglock)
- {
- struct signal_struct *sig = current->signal;
- if (!(current->jobctl & JOBCTL_STOP_PENDING)) {
- unsigned long gstop = JOBCTL_STOP_PENDING | JOBCTL_STOP_CONSUME;
- struct task_struct *t;
-
- WARN_ON_ONCE(signr & ~JOBCTL_STOP_SIGMASK);
- if (!likely(current->jobctl & JOBCTL_STOP_DEQUEUED) ||
- unlikely(sig->flags & SIGNAL_GROUP_EXIT) ||
- unlikely(sig->group_exec_task))
- return false;
-
- if (!(sig->flags & SIGNAL_STOP_STOPPED))
- sig->group_exit_code = signr;
- sig->group_stop_count = 0;
- if (task_set_jobctl_pending(current, signr | gstop))
- sig->group_stop_count++;
- t = current;
- while_each_thread(current, t) {
-
- if (!task_is_stopped(t) &&
- task_set_jobctl_pending(t, signr | gstop)) {
- sig->group_stop_count++;
- if (likely(!(t->ptrace & PT_SEIZED)))
- signal_wake_up(t, 0);
- else
- ptrace_trap_notify(t);
- }
- }
- }
- if (likely(!current->ptrace)) {
- int notify = 0;
-
- if (task_participate_group_stop(current))
- notify = CLD_STOPPED;
- current->jobctl |= JOBCTL_STOPPED;
- set_special_state(TASK_STOPPED);
- spin_unlock_irq(¤t->sighand->siglock);
-
- if (notify) {
- read_lock(&tasklist_lock);
- do_notify_parent_cldstop(current, false, notify);
- read_unlock(&tasklist_lock);
- }
-
- cgroup_enter_frozen();
- schedule();
- return true;
- } else {
-
- task_set_jobctl_pending(current, JOBCTL_TRAP_STOP);
- return false;
- }
- }
- static void do_jobctl_trap(void)
- {
- struct signal_struct *signal = current->signal;
- int signr = current->jobctl & JOBCTL_STOP_SIGMASK;
- if (current->ptrace & PT_SEIZED) {
- if (!signal->group_stop_count &&
- !(signal->flags & SIGNAL_STOP_STOPPED))
- signr = SIGTRAP;
- WARN_ON_ONCE(!signr);
- ptrace_do_notify(signr, signr | (PTRACE_EVENT_STOP << 8),
- CLD_STOPPED, 0);
- } else {
- WARN_ON_ONCE(!signr);
- ptrace_stop(signr, CLD_STOPPED, 0, NULL);
- }
- }
- static void do_freezer_trap(void)
- __releases(¤t->sighand->siglock)
- {
-
- if ((current->jobctl & (JOBCTL_PENDING_MASK | JOBCTL_TRAP_FREEZE)) !=
- JOBCTL_TRAP_FREEZE) {
- spin_unlock_irq(¤t->sighand->siglock);
- return;
- }
-
- __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
- clear_thread_flag(TIF_SIGPENDING);
- spin_unlock_irq(¤t->sighand->siglock);
- cgroup_enter_frozen();
- schedule();
- }
- static int ptrace_signal(int signr, kernel_siginfo_t *info, enum pid_type type)
- {
-
- current->jobctl |= JOBCTL_STOP_DEQUEUED;
- signr = ptrace_stop(signr, CLD_TRAPPED, 0, info);
-
- if (signr == 0)
- return signr;
-
- if (signr != info->si_signo) {
- clear_siginfo(info);
- info->si_signo = signr;
- info->si_errno = 0;
- info->si_code = SI_USER;
- rcu_read_lock();
- info->si_pid = task_pid_vnr(current->parent);
- info->si_uid = from_kuid_munged(current_user_ns(),
- task_uid(current->parent));
- rcu_read_unlock();
- }
-
- if (sigismember(¤t->blocked, signr) ||
- fatal_signal_pending(current)) {
- send_signal_locked(signr, info, current, type);
- signr = 0;
- }
- return signr;
- }
- static void hide_si_addr_tag_bits(struct ksignal *ksig)
- {
- switch (siginfo_layout(ksig->sig, ksig->info.si_code)) {
- case SIL_FAULT:
- case SIL_FAULT_TRAPNO:
- case SIL_FAULT_MCEERR:
- case SIL_FAULT_BNDERR:
- case SIL_FAULT_PKUERR:
- case SIL_FAULT_PERF_EVENT:
- ksig->info.si_addr = arch_untagged_si_addr(
- ksig->info.si_addr, ksig->sig, ksig->info.si_code);
- break;
- case SIL_KILL:
- case SIL_TIMER:
- case SIL_POLL:
- case SIL_CHLD:
- case SIL_RT:
- case SIL_SYS:
- break;
- }
- }
- bool get_signal(struct ksignal *ksig)
- {
- struct sighand_struct *sighand = current->sighand;
- struct signal_struct *signal = current->signal;
- int signr;
- clear_notify_signal();
- if (unlikely(task_work_pending(current)))
- task_work_run();
- if (!task_sigpending(current))
- return false;
- if (unlikely(uprobe_deny_signal()))
- return false;
-
- try_to_freeze();
- relock:
- spin_lock_irq(&sighand->siglock);
-
- if (unlikely(signal->flags & SIGNAL_CLD_MASK)) {
- int why;
- if (signal->flags & SIGNAL_CLD_CONTINUED)
- why = CLD_CONTINUED;
- else
- why = CLD_STOPPED;
- signal->flags &= ~SIGNAL_CLD_MASK;
- spin_unlock_irq(&sighand->siglock);
-
- read_lock(&tasklist_lock);
- do_notify_parent_cldstop(current, false, why);
- if (ptrace_reparented(current->group_leader))
- do_notify_parent_cldstop(current->group_leader,
- true, why);
- read_unlock(&tasklist_lock);
- goto relock;
- }
- for (;;) {
- struct k_sigaction *ka;
- enum pid_type type;
-
- if ((signal->flags & SIGNAL_GROUP_EXIT) ||
- signal->group_exec_task) {
- ksig->info.si_signo = signr = SIGKILL;
- sigdelset(¤t->pending.signal, SIGKILL);
- trace_signal_deliver(SIGKILL, SEND_SIG_NOINFO,
- &sighand->action[SIGKILL - 1]);
- recalc_sigpending();
- goto fatal;
- }
- if (unlikely(current->jobctl & JOBCTL_STOP_PENDING) &&
- do_signal_stop(0))
- goto relock;
- if (unlikely(current->jobctl &
- (JOBCTL_TRAP_MASK | JOBCTL_TRAP_FREEZE))) {
- if (current->jobctl & JOBCTL_TRAP_MASK) {
- do_jobctl_trap();
- spin_unlock_irq(&sighand->siglock);
- } else if (current->jobctl & JOBCTL_TRAP_FREEZE)
- do_freezer_trap();
- goto relock;
- }
-
- if (unlikely(cgroup_task_frozen(current))) {
- spin_unlock_irq(&sighand->siglock);
- cgroup_leave_frozen(false);
- goto relock;
- }
-
- type = PIDTYPE_PID;
- signr = dequeue_synchronous_signal(&ksig->info);
- if (!signr)
- signr = dequeue_signal(current, ¤t->blocked,
- &ksig->info, &type);
- if (!signr)
- break;
- if (unlikely(current->ptrace) && (signr != SIGKILL) &&
- !(sighand->action[signr -1].sa.sa_flags & SA_IMMUTABLE)) {
- signr = ptrace_signal(signr, &ksig->info, type);
- if (!signr)
- continue;
- }
- ka = &sighand->action[signr-1];
-
- trace_signal_deliver(signr, &ksig->info, ka);
- if (ka->sa.sa_handler == SIG_IGN)
- continue;
- if (ka->sa.sa_handler != SIG_DFL) {
-
- ksig->ka = *ka;
- if (ka->sa.sa_flags & SA_ONESHOT)
- ka->sa.sa_handler = SIG_DFL;
- break;
- }
-
- if (sig_kernel_ignore(signr))
- continue;
-
- if (unlikely(signal->flags & SIGNAL_UNKILLABLE) &&
- !sig_kernel_only(signr))
- continue;
- if (sig_kernel_stop(signr)) {
-
- if (signr != SIGSTOP) {
- spin_unlock_irq(&sighand->siglock);
-
- if (is_current_pgrp_orphaned())
- goto relock;
- spin_lock_irq(&sighand->siglock);
- }
- if (likely(do_signal_stop(ksig->info.si_signo))) {
-
- goto relock;
- }
-
- continue;
- }
- fatal:
- spin_unlock_irq(&sighand->siglock);
- if (unlikely(cgroup_task_frozen(current)))
- cgroup_leave_frozen(true);
-
- current->flags |= PF_SIGNALED;
- if (sig_kernel_coredump(signr)) {
- if (print_fatal_signals)
- print_fatal_signal(ksig->info.si_signo);
- proc_coredump_connector(current);
-
- do_coredump(&ksig->info);
- }
-
- if (current->flags & PF_IO_WORKER)
- goto out;
-
- do_group_exit(ksig->info.si_signo);
-
- }
- spin_unlock_irq(&sighand->siglock);
- out:
- ksig->sig = signr;
- if (!(ksig->ka.sa.sa_flags & SA_EXPOSE_TAGBITS))
- hide_si_addr_tag_bits(ksig);
- return ksig->sig > 0;
- }
- static void signal_delivered(struct ksignal *ksig, int stepping)
- {
- sigset_t blocked;
-
- clear_restore_sigmask();
- sigorsets(&blocked, ¤t->blocked, &ksig->ka.sa.sa_mask);
- if (!(ksig->ka.sa.sa_flags & SA_NODEFER))
- sigaddset(&blocked, ksig->sig);
- set_current_blocked(&blocked);
- if (current->sas_ss_flags & SS_AUTODISARM)
- sas_ss_reset(current);
- if (stepping)
- ptrace_notify(SIGTRAP, 0);
- }
- void signal_setup_done(int failed, struct ksignal *ksig, int stepping)
- {
- if (failed)
- force_sigsegv(ksig->sig);
- else
- signal_delivered(ksig, stepping);
- }
- static void retarget_shared_pending(struct task_struct *tsk, sigset_t *which)
- {
- sigset_t retarget;
- struct task_struct *t;
- sigandsets(&retarget, &tsk->signal->shared_pending.signal, which);
- if (sigisemptyset(&retarget))
- return;
- t = tsk;
- while_each_thread(tsk, t) {
- if (t->flags & PF_EXITING)
- continue;
- if (!has_pending_signals(&retarget, &t->blocked))
- continue;
-
- sigandsets(&retarget, &retarget, &t->blocked);
- if (!task_sigpending(t))
- signal_wake_up(t, 0);
- if (sigisemptyset(&retarget))
- break;
- }
- }
- void exit_signals(struct task_struct *tsk)
- {
- int group_stop = 0;
- sigset_t unblocked;
-
- cgroup_threadgroup_change_begin(tsk);
- if (thread_group_empty(tsk) || (tsk->signal->flags & SIGNAL_GROUP_EXIT)) {
- tsk->flags |= PF_EXITING;
- cgroup_threadgroup_change_end(tsk);
- return;
- }
- spin_lock_irq(&tsk->sighand->siglock);
-
- tsk->flags |= PF_EXITING;
- cgroup_threadgroup_change_end(tsk);
- if (!task_sigpending(tsk))
- goto out;
- unblocked = tsk->blocked;
- signotset(&unblocked);
- retarget_shared_pending(tsk, &unblocked);
- if (unlikely(tsk->jobctl & JOBCTL_STOP_PENDING) &&
- task_participate_group_stop(tsk))
- group_stop = CLD_STOPPED;
- out:
- spin_unlock_irq(&tsk->sighand->siglock);
-
- if (unlikely(group_stop)) {
- read_lock(&tasklist_lock);
- do_notify_parent_cldstop(tsk, false, group_stop);
- read_unlock(&tasklist_lock);
- }
- }
- SYSCALL_DEFINE0(restart_syscall)
- {
- struct restart_block *restart = ¤t->restart_block;
- return restart->fn(restart);
- }
- long do_no_restart_syscall(struct restart_block *param)
- {
- return -EINTR;
- }
- static void __set_task_blocked(struct task_struct *tsk, const sigset_t *newset)
- {
- if (task_sigpending(tsk) && !thread_group_empty(tsk)) {
- sigset_t newblocked;
-
- sigandnsets(&newblocked, newset, ¤t->blocked);
- retarget_shared_pending(tsk, &newblocked);
- }
- tsk->blocked = *newset;
- recalc_sigpending();
- }
- void set_current_blocked(sigset_t *newset)
- {
- sigdelsetmask(newset, sigmask(SIGKILL) | sigmask(SIGSTOP));
- __set_current_blocked(newset);
- }
- void __set_current_blocked(const sigset_t *newset)
- {
- struct task_struct *tsk = current;
-
- if (sigequalsets(&tsk->blocked, newset))
- return;
- spin_lock_irq(&tsk->sighand->siglock);
- __set_task_blocked(tsk, newset);
- spin_unlock_irq(&tsk->sighand->siglock);
- }
- int sigprocmask(int how, sigset_t *set, sigset_t *oldset)
- {
- struct task_struct *tsk = current;
- sigset_t newset;
-
- if (oldset)
- *oldset = tsk->blocked;
- switch (how) {
- case SIG_BLOCK:
- sigorsets(&newset, &tsk->blocked, set);
- break;
- case SIG_UNBLOCK:
- sigandnsets(&newset, &tsk->blocked, set);
- break;
- case SIG_SETMASK:
- newset = *set;
- break;
- default:
- return -EINVAL;
- }
- __set_current_blocked(&newset);
- return 0;
- }
- EXPORT_SYMBOL(sigprocmask);
- int set_user_sigmask(const sigset_t __user *umask, size_t sigsetsize)
- {
- sigset_t kmask;
- if (!umask)
- return 0;
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
- if (copy_from_user(&kmask, umask, sizeof(sigset_t)))
- return -EFAULT;
- set_restore_sigmask();
- current->saved_sigmask = current->blocked;
- set_current_blocked(&kmask);
- return 0;
- }
- #ifdef CONFIG_COMPAT
- int set_compat_user_sigmask(const compat_sigset_t __user *umask,
- size_t sigsetsize)
- {
- sigset_t kmask;
- if (!umask)
- return 0;
- if (sigsetsize != sizeof(compat_sigset_t))
- return -EINVAL;
- if (get_compat_sigset(&kmask, umask))
- return -EFAULT;
- set_restore_sigmask();
- current->saved_sigmask = current->blocked;
- set_current_blocked(&kmask);
- return 0;
- }
- #endif
- SYSCALL_DEFINE4(rt_sigprocmask, int, how, sigset_t __user *, nset,
- sigset_t __user *, oset, size_t, sigsetsize)
- {
- sigset_t old_set, new_set;
- int error;
-
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
- old_set = current->blocked;
- if (nset) {
- if (copy_from_user(&new_set, nset, sizeof(sigset_t)))
- return -EFAULT;
- sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP));
- error = sigprocmask(how, &new_set, NULL);
- if (error)
- return error;
- }
- if (oset) {
- if (copy_to_user(oset, &old_set, sizeof(sigset_t)))
- return -EFAULT;
- }
- return 0;
- }
- #ifdef CONFIG_COMPAT
- COMPAT_SYSCALL_DEFINE4(rt_sigprocmask, int, how, compat_sigset_t __user *, nset,
- compat_sigset_t __user *, oset, compat_size_t, sigsetsize)
- {
- sigset_t old_set = current->blocked;
-
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
- if (nset) {
- sigset_t new_set;
- int error;
- if (get_compat_sigset(&new_set, nset))
- return -EFAULT;
- sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP));
- error = sigprocmask(how, &new_set, NULL);
- if (error)
- return error;
- }
- return oset ? put_compat_sigset(oset, &old_set, sizeof(*oset)) : 0;
- }
- #endif
- static void do_sigpending(sigset_t *set)
- {
- spin_lock_irq(¤t->sighand->siglock);
- sigorsets(set, ¤t->pending.signal,
- ¤t->signal->shared_pending.signal);
- spin_unlock_irq(¤t->sighand->siglock);
-
- sigandsets(set, ¤t->blocked, set);
- }
- SYSCALL_DEFINE2(rt_sigpending, sigset_t __user *, uset, size_t, sigsetsize)
- {
- sigset_t set;
- if (sigsetsize > sizeof(*uset))
- return -EINVAL;
- do_sigpending(&set);
- if (copy_to_user(uset, &set, sigsetsize))
- return -EFAULT;
- return 0;
- }
- #ifdef CONFIG_COMPAT
- COMPAT_SYSCALL_DEFINE2(rt_sigpending, compat_sigset_t __user *, uset,
- compat_size_t, sigsetsize)
- {
- sigset_t set;
- if (sigsetsize > sizeof(*uset))
- return -EINVAL;
- do_sigpending(&set);
- return put_compat_sigset(uset, &set, sigsetsize);
- }
- #endif
- static const struct {
- unsigned char limit, layout;
- } sig_sicodes[] = {
- [SIGILL] = { NSIGILL, SIL_FAULT },
- [SIGFPE] = { NSIGFPE, SIL_FAULT },
- [SIGSEGV] = { NSIGSEGV, SIL_FAULT },
- [SIGBUS] = { NSIGBUS, SIL_FAULT },
- [SIGTRAP] = { NSIGTRAP, SIL_FAULT },
- #if defined(SIGEMT)
- [SIGEMT] = { NSIGEMT, SIL_FAULT },
- #endif
- [SIGCHLD] = { NSIGCHLD, SIL_CHLD },
- [SIGPOLL] = { NSIGPOLL, SIL_POLL },
- [SIGSYS] = { NSIGSYS, SIL_SYS },
- };
- static bool known_siginfo_layout(unsigned sig, int si_code)
- {
- if (si_code == SI_KERNEL)
- return true;
- else if ((si_code > SI_USER)) {
- if (sig_specific_sicodes(sig)) {
- if (si_code <= sig_sicodes[sig].limit)
- return true;
- }
- else if (si_code <= NSIGPOLL)
- return true;
- }
- else if (si_code >= SI_DETHREAD)
- return true;
- else if (si_code == SI_ASYNCNL)
- return true;
- return false;
- }
- enum siginfo_layout siginfo_layout(unsigned sig, int si_code)
- {
- enum siginfo_layout layout = SIL_KILL;
- if ((si_code > SI_USER) && (si_code < SI_KERNEL)) {
- if ((sig < ARRAY_SIZE(sig_sicodes)) &&
- (si_code <= sig_sicodes[sig].limit)) {
- layout = sig_sicodes[sig].layout;
-
- if ((sig == SIGBUS) &&
- (si_code >= BUS_MCEERR_AR) && (si_code <= BUS_MCEERR_AO))
- layout = SIL_FAULT_MCEERR;
- else if ((sig == SIGSEGV) && (si_code == SEGV_BNDERR))
- layout = SIL_FAULT_BNDERR;
- #ifdef SEGV_PKUERR
- else if ((sig == SIGSEGV) && (si_code == SEGV_PKUERR))
- layout = SIL_FAULT_PKUERR;
- #endif
- else if ((sig == SIGTRAP) && (si_code == TRAP_PERF))
- layout = SIL_FAULT_PERF_EVENT;
- else if (IS_ENABLED(CONFIG_SPARC) &&
- (sig == SIGILL) && (si_code == ILL_ILLTRP))
- layout = SIL_FAULT_TRAPNO;
- else if (IS_ENABLED(CONFIG_ALPHA) &&
- ((sig == SIGFPE) ||
- ((sig == SIGTRAP) && (si_code == TRAP_UNK))))
- layout = SIL_FAULT_TRAPNO;
- }
- else if (si_code <= NSIGPOLL)
- layout = SIL_POLL;
- } else {
- if (si_code == SI_TIMER)
- layout = SIL_TIMER;
- else if (si_code == SI_SIGIO)
- layout = SIL_POLL;
- else if (si_code < 0)
- layout = SIL_RT;
- }
- return layout;
- }
- static inline char __user *si_expansion(const siginfo_t __user *info)
- {
- return ((char __user *)info) + sizeof(struct kernel_siginfo);
- }
- int copy_siginfo_to_user(siginfo_t __user *to, const kernel_siginfo_t *from)
- {
- char __user *expansion = si_expansion(to);
- if (copy_to_user(to, from , sizeof(struct kernel_siginfo)))
- return -EFAULT;
- if (clear_user(expansion, SI_EXPANSION_SIZE))
- return -EFAULT;
- return 0;
- }
- static int post_copy_siginfo_from_user(kernel_siginfo_t *info,
- const siginfo_t __user *from)
- {
- if (unlikely(!known_siginfo_layout(info->si_signo, info->si_code))) {
- char __user *expansion = si_expansion(from);
- char buf[SI_EXPANSION_SIZE];
- int i;
-
- if (copy_from_user(&buf, expansion, SI_EXPANSION_SIZE))
- return -EFAULT;
- for (i = 0; i < SI_EXPANSION_SIZE; i++) {
- if (buf[i] != 0)
- return -E2BIG;
- }
- }
- return 0;
- }
- static int __copy_siginfo_from_user(int signo, kernel_siginfo_t *to,
- const siginfo_t __user *from)
- {
- if (copy_from_user(to, from, sizeof(struct kernel_siginfo)))
- return -EFAULT;
- to->si_signo = signo;
- return post_copy_siginfo_from_user(to, from);
- }
- int copy_siginfo_from_user(kernel_siginfo_t *to, const siginfo_t __user *from)
- {
- if (copy_from_user(to, from, sizeof(struct kernel_siginfo)))
- return -EFAULT;
- return post_copy_siginfo_from_user(to, from);
- }
- #ifdef CONFIG_COMPAT
- void copy_siginfo_to_external32(struct compat_siginfo *to,
- const struct kernel_siginfo *from)
- {
- memset(to, 0, sizeof(*to));
- to->si_signo = from->si_signo;
- to->si_errno = from->si_errno;
- to->si_code = from->si_code;
- switch(siginfo_layout(from->si_signo, from->si_code)) {
- case SIL_KILL:
- to->si_pid = from->si_pid;
- to->si_uid = from->si_uid;
- break;
- case SIL_TIMER:
- to->si_tid = from->si_tid;
- to->si_overrun = from->si_overrun;
- to->si_int = from->si_int;
- break;
- case SIL_POLL:
- to->si_band = from->si_band;
- to->si_fd = from->si_fd;
- break;
- case SIL_FAULT:
- to->si_addr = ptr_to_compat(from->si_addr);
- break;
- case SIL_FAULT_TRAPNO:
- to->si_addr = ptr_to_compat(from->si_addr);
- to->si_trapno = from->si_trapno;
- break;
- case SIL_FAULT_MCEERR:
- to->si_addr = ptr_to_compat(from->si_addr);
- to->si_addr_lsb = from->si_addr_lsb;
- break;
- case SIL_FAULT_BNDERR:
- to->si_addr = ptr_to_compat(from->si_addr);
- to->si_lower = ptr_to_compat(from->si_lower);
- to->si_upper = ptr_to_compat(from->si_upper);
- break;
- case SIL_FAULT_PKUERR:
- to->si_addr = ptr_to_compat(from->si_addr);
- to->si_pkey = from->si_pkey;
- break;
- case SIL_FAULT_PERF_EVENT:
- to->si_addr = ptr_to_compat(from->si_addr);
- to->si_perf_data = from->si_perf_data;
- to->si_perf_type = from->si_perf_type;
- to->si_perf_flags = from->si_perf_flags;
- break;
- case SIL_CHLD:
- to->si_pid = from->si_pid;
- to->si_uid = from->si_uid;
- to->si_status = from->si_status;
- to->si_utime = from->si_utime;
- to->si_stime = from->si_stime;
- break;
- case SIL_RT:
- to->si_pid = from->si_pid;
- to->si_uid = from->si_uid;
- to->si_int = from->si_int;
- break;
- case SIL_SYS:
- to->si_call_addr = ptr_to_compat(from->si_call_addr);
- to->si_syscall = from->si_syscall;
- to->si_arch = from->si_arch;
- break;
- }
- }
- int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
- const struct kernel_siginfo *from)
- {
- struct compat_siginfo new;
- copy_siginfo_to_external32(&new, from);
- if (copy_to_user(to, &new, sizeof(struct compat_siginfo)))
- return -EFAULT;
- return 0;
- }
- static int post_copy_siginfo_from_user32(kernel_siginfo_t *to,
- const struct compat_siginfo *from)
- {
- clear_siginfo(to);
- to->si_signo = from->si_signo;
- to->si_errno = from->si_errno;
- to->si_code = from->si_code;
- switch(siginfo_layout(from->si_signo, from->si_code)) {
- case SIL_KILL:
- to->si_pid = from->si_pid;
- to->si_uid = from->si_uid;
- break;
- case SIL_TIMER:
- to->si_tid = from->si_tid;
- to->si_overrun = from->si_overrun;
- to->si_int = from->si_int;
- break;
- case SIL_POLL:
- to->si_band = from->si_band;
- to->si_fd = from->si_fd;
- break;
- case SIL_FAULT:
- to->si_addr = compat_ptr(from->si_addr);
- break;
- case SIL_FAULT_TRAPNO:
- to->si_addr = compat_ptr(from->si_addr);
- to->si_trapno = from->si_trapno;
- break;
- case SIL_FAULT_MCEERR:
- to->si_addr = compat_ptr(from->si_addr);
- to->si_addr_lsb = from->si_addr_lsb;
- break;
- case SIL_FAULT_BNDERR:
- to->si_addr = compat_ptr(from->si_addr);
- to->si_lower = compat_ptr(from->si_lower);
- to->si_upper = compat_ptr(from->si_upper);
- break;
- case SIL_FAULT_PKUERR:
- to->si_addr = compat_ptr(from->si_addr);
- to->si_pkey = from->si_pkey;
- break;
- case SIL_FAULT_PERF_EVENT:
- to->si_addr = compat_ptr(from->si_addr);
- to->si_perf_data = from->si_perf_data;
- to->si_perf_type = from->si_perf_type;
- to->si_perf_flags = from->si_perf_flags;
- break;
- case SIL_CHLD:
- to->si_pid = from->si_pid;
- to->si_uid = from->si_uid;
- to->si_status = from->si_status;
- #ifdef CONFIG_X86_X32_ABI
- if (in_x32_syscall()) {
- to->si_utime = from->_sifields._sigchld_x32._utime;
- to->si_stime = from->_sifields._sigchld_x32._stime;
- } else
- #endif
- {
- to->si_utime = from->si_utime;
- to->si_stime = from->si_stime;
- }
- break;
- case SIL_RT:
- to->si_pid = from->si_pid;
- to->si_uid = from->si_uid;
- to->si_int = from->si_int;
- break;
- case SIL_SYS:
- to->si_call_addr = compat_ptr(from->si_call_addr);
- to->si_syscall = from->si_syscall;
- to->si_arch = from->si_arch;
- break;
- }
- return 0;
- }
- static int __copy_siginfo_from_user32(int signo, struct kernel_siginfo *to,
- const struct compat_siginfo __user *ufrom)
- {
- struct compat_siginfo from;
- if (copy_from_user(&from, ufrom, sizeof(struct compat_siginfo)))
- return -EFAULT;
- from.si_signo = signo;
- return post_copy_siginfo_from_user32(to, &from);
- }
- int copy_siginfo_from_user32(struct kernel_siginfo *to,
- const struct compat_siginfo __user *ufrom)
- {
- struct compat_siginfo from;
- if (copy_from_user(&from, ufrom, sizeof(struct compat_siginfo)))
- return -EFAULT;
- return post_copy_siginfo_from_user32(to, &from);
- }
- #endif
- static int do_sigtimedwait(const sigset_t *which, kernel_siginfo_t *info,
- const struct timespec64 *ts)
- {
- ktime_t *to = NULL, timeout = KTIME_MAX;
- struct task_struct *tsk = current;
- sigset_t mask = *which;
- enum pid_type type;
- int sig, ret = 0;
- if (ts) {
- if (!timespec64_valid(ts))
- return -EINVAL;
- timeout = timespec64_to_ktime(*ts);
- to = &timeout;
- }
-
- sigdelsetmask(&mask, sigmask(SIGKILL) | sigmask(SIGSTOP));
- signotset(&mask);
- spin_lock_irq(&tsk->sighand->siglock);
- sig = dequeue_signal(tsk, &mask, info, &type);
- if (!sig && timeout) {
-
- tsk->real_blocked = tsk->blocked;
- sigandsets(&tsk->blocked, &tsk->blocked, &mask);
- recalc_sigpending();
- spin_unlock_irq(&tsk->sighand->siglock);
- __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
- ret = schedule_hrtimeout_range(to, tsk->timer_slack_ns,
- HRTIMER_MODE_REL);
- spin_lock_irq(&tsk->sighand->siglock);
- __set_task_blocked(tsk, &tsk->real_blocked);
- sigemptyset(&tsk->real_blocked);
- sig = dequeue_signal(tsk, &mask, info, &type);
- }
- spin_unlock_irq(&tsk->sighand->siglock);
- if (sig)
- return sig;
- return ret ? -EINTR : -EAGAIN;
- }
- SYSCALL_DEFINE4(rt_sigtimedwait, const sigset_t __user *, uthese,
- siginfo_t __user *, uinfo,
- const struct __kernel_timespec __user *, uts,
- size_t, sigsetsize)
- {
- sigset_t these;
- struct timespec64 ts;
- kernel_siginfo_t info;
- int ret;
-
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
- if (copy_from_user(&these, uthese, sizeof(these)))
- return -EFAULT;
- if (uts) {
- if (get_timespec64(&ts, uts))
- return -EFAULT;
- }
- ret = do_sigtimedwait(&these, &info, uts ? &ts : NULL);
- if (ret > 0 && uinfo) {
- if (copy_siginfo_to_user(uinfo, &info))
- ret = -EFAULT;
- }
- return ret;
- }
- #ifdef CONFIG_COMPAT_32BIT_TIME
- SYSCALL_DEFINE4(rt_sigtimedwait_time32, const sigset_t __user *, uthese,
- siginfo_t __user *, uinfo,
- const struct old_timespec32 __user *, uts,
- size_t, sigsetsize)
- {
- sigset_t these;
- struct timespec64 ts;
- kernel_siginfo_t info;
- int ret;
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
- if (copy_from_user(&these, uthese, sizeof(these)))
- return -EFAULT;
- if (uts) {
- if (get_old_timespec32(&ts, uts))
- return -EFAULT;
- }
- ret = do_sigtimedwait(&these, &info, uts ? &ts : NULL);
- if (ret > 0 && uinfo) {
- if (copy_siginfo_to_user(uinfo, &info))
- ret = -EFAULT;
- }
- return ret;
- }
- #endif
- #ifdef CONFIG_COMPAT
- COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait_time64, compat_sigset_t __user *, uthese,
- struct compat_siginfo __user *, uinfo,
- struct __kernel_timespec __user *, uts, compat_size_t, sigsetsize)
- {
- sigset_t s;
- struct timespec64 t;
- kernel_siginfo_t info;
- long ret;
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
- if (get_compat_sigset(&s, uthese))
- return -EFAULT;
- if (uts) {
- if (get_timespec64(&t, uts))
- return -EFAULT;
- }
- ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
- if (ret > 0 && uinfo) {
- if (copy_siginfo_to_user32(uinfo, &info))
- ret = -EFAULT;
- }
- return ret;
- }
- #ifdef CONFIG_COMPAT_32BIT_TIME
- COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait_time32, compat_sigset_t __user *, uthese,
- struct compat_siginfo __user *, uinfo,
- struct old_timespec32 __user *, uts, compat_size_t, sigsetsize)
- {
- sigset_t s;
- struct timespec64 t;
- kernel_siginfo_t info;
- long ret;
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
- if (get_compat_sigset(&s, uthese))
- return -EFAULT;
- if (uts) {
- if (get_old_timespec32(&t, uts))
- return -EFAULT;
- }
- ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
- if (ret > 0 && uinfo) {
- if (copy_siginfo_to_user32(uinfo, &info))
- ret = -EFAULT;
- }
- return ret;
- }
- #endif
- #endif
- static inline void prepare_kill_siginfo(int sig, struct kernel_siginfo *info)
- {
- clear_siginfo(info);
- info->si_signo = sig;
- info->si_errno = 0;
- info->si_code = SI_USER;
- info->si_pid = task_tgid_vnr(current);
- info->si_uid = from_kuid_munged(current_user_ns(), current_uid());
- }
- SYSCALL_DEFINE2(kill, pid_t, pid, int, sig)
- {
- struct kernel_siginfo info;
- prepare_kill_siginfo(sig, &info);
- return kill_something_info(sig, &info, pid);
- }
- static bool access_pidfd_pidns(struct pid *pid)
- {
- struct pid_namespace *active = task_active_pid_ns(current);
- struct pid_namespace *p = ns_of_pid(pid);
- for (;;) {
- if (!p)
- return false;
- if (p == active)
- break;
- p = p->parent;
- }
- return true;
- }
- static int copy_siginfo_from_user_any(kernel_siginfo_t *kinfo,
- siginfo_t __user *info)
- {
- #ifdef CONFIG_COMPAT
-
- if (in_compat_syscall())
- return copy_siginfo_from_user32(
- kinfo, (struct compat_siginfo __user *)info);
- #endif
- return copy_siginfo_from_user(kinfo, info);
- }
- static struct pid *pidfd_to_pid(const struct file *file)
- {
- struct pid *pid;
- pid = pidfd_pid(file);
- if (!IS_ERR(pid))
- return pid;
- return tgid_pidfd_to_pid(file);
- }
- SYSCALL_DEFINE4(pidfd_send_signal, int, pidfd, int, sig,
- siginfo_t __user *, info, unsigned int, flags)
- {
- int ret;
- struct fd f;
- struct pid *pid;
- kernel_siginfo_t kinfo;
-
- if (flags)
- return -EINVAL;
- f = fdget(pidfd);
- if (!f.file)
- return -EBADF;
-
- pid = pidfd_to_pid(f.file);
- if (IS_ERR(pid)) {
- ret = PTR_ERR(pid);
- goto err;
- }
- ret = -EINVAL;
- if (!access_pidfd_pidns(pid))
- goto err;
- if (info) {
- ret = copy_siginfo_from_user_any(&kinfo, info);
- if (unlikely(ret))
- goto err;
- ret = -EINVAL;
- if (unlikely(sig != kinfo.si_signo))
- goto err;
-
- ret = -EPERM;
- if ((task_pid(current) != pid) &&
- (kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL))
- goto err;
- } else {
- prepare_kill_siginfo(sig, &kinfo);
- }
- ret = kill_pid_info(sig, &kinfo, pid);
- err:
- fdput(f);
- return ret;
- }
- static int
- do_send_specific(pid_t tgid, pid_t pid, int sig, struct kernel_siginfo *info)
- {
- struct task_struct *p;
- int error = -ESRCH;
- rcu_read_lock();
- p = find_task_by_vpid(pid);
- if (p && (tgid <= 0 || task_tgid_vnr(p) == tgid)) {
- error = check_kill_permission(sig, info, p);
-
- if (!error && sig) {
- error = do_send_sig_info(sig, info, p, PIDTYPE_PID);
-
- if (unlikely(error == -ESRCH))
- error = 0;
- }
- }
- rcu_read_unlock();
- return error;
- }
- static int do_tkill(pid_t tgid, pid_t pid, int sig)
- {
- struct kernel_siginfo info;
- clear_siginfo(&info);
- info.si_signo = sig;
- info.si_errno = 0;
- info.si_code = SI_TKILL;
- info.si_pid = task_tgid_vnr(current);
- info.si_uid = from_kuid_munged(current_user_ns(), current_uid());
- return do_send_specific(tgid, pid, sig, &info);
- }
- SYSCALL_DEFINE3(tgkill, pid_t, tgid, pid_t, pid, int, sig)
- {
-
- if (pid <= 0 || tgid <= 0)
- return -EINVAL;
- return do_tkill(tgid, pid, sig);
- }
- SYSCALL_DEFINE2(tkill, pid_t, pid, int, sig)
- {
-
- if (pid <= 0)
- return -EINVAL;
- return do_tkill(0, pid, sig);
- }
- static int do_rt_sigqueueinfo(pid_t pid, int sig, kernel_siginfo_t *info)
- {
-
- if ((info->si_code >= 0 || info->si_code == SI_TKILL) &&
- (task_pid_vnr(current) != pid))
- return -EPERM;
-
- return kill_proc_info(sig, info, pid);
- }
- SYSCALL_DEFINE3(rt_sigqueueinfo, pid_t, pid, int, sig,
- siginfo_t __user *, uinfo)
- {
- kernel_siginfo_t info;
- int ret = __copy_siginfo_from_user(sig, &info, uinfo);
- if (unlikely(ret))
- return ret;
- return do_rt_sigqueueinfo(pid, sig, &info);
- }
- #ifdef CONFIG_COMPAT
- COMPAT_SYSCALL_DEFINE3(rt_sigqueueinfo,
- compat_pid_t, pid,
- int, sig,
- struct compat_siginfo __user *, uinfo)
- {
- kernel_siginfo_t info;
- int ret = __copy_siginfo_from_user32(sig, &info, uinfo);
- if (unlikely(ret))
- return ret;
- return do_rt_sigqueueinfo(pid, sig, &info);
- }
- #endif
- static int do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, kernel_siginfo_t *info)
- {
-
- if (pid <= 0 || tgid <= 0)
- return -EINVAL;
-
- if ((info->si_code >= 0 || info->si_code == SI_TKILL) &&
- (task_pid_vnr(current) != pid))
- return -EPERM;
- return do_send_specific(tgid, pid, sig, info);
- }
- SYSCALL_DEFINE4(rt_tgsigqueueinfo, pid_t, tgid, pid_t, pid, int, sig,
- siginfo_t __user *, uinfo)
- {
- kernel_siginfo_t info;
- int ret = __copy_siginfo_from_user(sig, &info, uinfo);
- if (unlikely(ret))
- return ret;
- return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
- }
- #ifdef CONFIG_COMPAT
- COMPAT_SYSCALL_DEFINE4(rt_tgsigqueueinfo,
- compat_pid_t, tgid,
- compat_pid_t, pid,
- int, sig,
- struct compat_siginfo __user *, uinfo)
- {
- kernel_siginfo_t info;
- int ret = __copy_siginfo_from_user32(sig, &info, uinfo);
- if (unlikely(ret))
- return ret;
- return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
- }
- #endif
- void kernel_sigaction(int sig, __sighandler_t action)
- {
- spin_lock_irq(¤t->sighand->siglock);
- current->sighand->action[sig - 1].sa.sa_handler = action;
- if (action == SIG_IGN) {
- sigset_t mask;
- sigemptyset(&mask);
- sigaddset(&mask, sig);
- flush_sigqueue_mask(&mask, ¤t->signal->shared_pending);
- flush_sigqueue_mask(&mask, ¤t->pending);
- recalc_sigpending();
- }
- spin_unlock_irq(¤t->sighand->siglock);
- }
- EXPORT_SYMBOL(kernel_sigaction);
- void __weak sigaction_compat_abi(struct k_sigaction *act,
- struct k_sigaction *oact)
- {
- }
- int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
- {
- struct task_struct *p = current, *t;
- struct k_sigaction *k;
- sigset_t mask;
- if (!valid_signal(sig) || sig < 1 || (act && sig_kernel_only(sig)))
- return -EINVAL;
- k = &p->sighand->action[sig-1];
- spin_lock_irq(&p->sighand->siglock);
- if (k->sa.sa_flags & SA_IMMUTABLE) {
- spin_unlock_irq(&p->sighand->siglock);
- return -EINVAL;
- }
- if (oact)
- *oact = *k;
-
- BUILD_BUG_ON(UAPI_SA_FLAGS & SA_UNSUPPORTED);
-
- if (act)
- act->sa.sa_flags &= UAPI_SA_FLAGS;
- if (oact)
- oact->sa.sa_flags &= UAPI_SA_FLAGS;
- sigaction_compat_abi(act, oact);
- if (act) {
- sigdelsetmask(&act->sa.sa_mask,
- sigmask(SIGKILL) | sigmask(SIGSTOP));
- *k = *act;
-
- if (sig_handler_ignored(sig_handler(p, sig), sig)) {
- sigemptyset(&mask);
- sigaddset(&mask, sig);
- flush_sigqueue_mask(&mask, &p->signal->shared_pending);
- for_each_thread(p, t)
- flush_sigqueue_mask(&mask, &t->pending);
- }
- }
- spin_unlock_irq(&p->sighand->siglock);
- return 0;
- }
- #ifdef CONFIG_DYNAMIC_SIGFRAME
- static inline void sigaltstack_lock(void)
- __acquires(¤t->sighand->siglock)
- {
- spin_lock_irq(¤t->sighand->siglock);
- }
- static inline void sigaltstack_unlock(void)
- __releases(¤t->sighand->siglock)
- {
- spin_unlock_irq(¤t->sighand->siglock);
- }
- #else
- static inline void sigaltstack_lock(void) { }
- static inline void sigaltstack_unlock(void) { }
- #endif
- static int
- do_sigaltstack (const stack_t *ss, stack_t *oss, unsigned long sp,
- size_t min_ss_size)
- {
- struct task_struct *t = current;
- int ret = 0;
- if (oss) {
- memset(oss, 0, sizeof(stack_t));
- oss->ss_sp = (void __user *) t->sas_ss_sp;
- oss->ss_size = t->sas_ss_size;
- oss->ss_flags = sas_ss_flags(sp) |
- (current->sas_ss_flags & SS_FLAG_BITS);
- }
- if (ss) {
- void __user *ss_sp = ss->ss_sp;
- size_t ss_size = ss->ss_size;
- unsigned ss_flags = ss->ss_flags;
- int ss_mode;
- if (unlikely(on_sig_stack(sp)))
- return -EPERM;
- ss_mode = ss_flags & ~SS_FLAG_BITS;
- if (unlikely(ss_mode != SS_DISABLE && ss_mode != SS_ONSTACK &&
- ss_mode != 0))
- return -EINVAL;
-
- if (t->sas_ss_sp == (unsigned long)ss_sp &&
- t->sas_ss_size == ss_size &&
- t->sas_ss_flags == ss_flags)
- return 0;
- sigaltstack_lock();
- if (ss_mode == SS_DISABLE) {
- ss_size = 0;
- ss_sp = NULL;
- } else {
- if (unlikely(ss_size < min_ss_size))
- ret = -ENOMEM;
- if (!sigaltstack_size_valid(ss_size))
- ret = -ENOMEM;
- }
- if (!ret) {
- t->sas_ss_sp = (unsigned long) ss_sp;
- t->sas_ss_size = ss_size;
- t->sas_ss_flags = ss_flags;
- }
- sigaltstack_unlock();
- }
- return ret;
- }
- SYSCALL_DEFINE2(sigaltstack,const stack_t __user *,uss, stack_t __user *,uoss)
- {
- stack_t new, old;
- int err;
- if (uss && copy_from_user(&new, uss, sizeof(stack_t)))
- return -EFAULT;
- err = do_sigaltstack(uss ? &new : NULL, uoss ? &old : NULL,
- current_user_stack_pointer(),
- MINSIGSTKSZ);
- if (!err && uoss && copy_to_user(uoss, &old, sizeof(stack_t)))
- err = -EFAULT;
- return err;
- }
- int restore_altstack(const stack_t __user *uss)
- {
- stack_t new;
- if (copy_from_user(&new, uss, sizeof(stack_t)))
- return -EFAULT;
- (void)do_sigaltstack(&new, NULL, current_user_stack_pointer(),
- MINSIGSTKSZ);
-
- return 0;
- }
- int __save_altstack(stack_t __user *uss, unsigned long sp)
- {
- struct task_struct *t = current;
- int err = __put_user((void __user *)t->sas_ss_sp, &uss->ss_sp) |
- __put_user(t->sas_ss_flags, &uss->ss_flags) |
- __put_user(t->sas_ss_size, &uss->ss_size);
- return err;
- }
- #ifdef CONFIG_COMPAT
- static int do_compat_sigaltstack(const compat_stack_t __user *uss_ptr,
- compat_stack_t __user *uoss_ptr)
- {
- stack_t uss, uoss;
- int ret;
- if (uss_ptr) {
- compat_stack_t uss32;
- if (copy_from_user(&uss32, uss_ptr, sizeof(compat_stack_t)))
- return -EFAULT;
- uss.ss_sp = compat_ptr(uss32.ss_sp);
- uss.ss_flags = uss32.ss_flags;
- uss.ss_size = uss32.ss_size;
- }
- ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss,
- compat_user_stack_pointer(),
- COMPAT_MINSIGSTKSZ);
- if (ret >= 0 && uoss_ptr) {
- compat_stack_t old;
- memset(&old, 0, sizeof(old));
- old.ss_sp = ptr_to_compat(uoss.ss_sp);
- old.ss_flags = uoss.ss_flags;
- old.ss_size = uoss.ss_size;
- if (copy_to_user(uoss_ptr, &old, sizeof(compat_stack_t)))
- ret = -EFAULT;
- }
- return ret;
- }
- COMPAT_SYSCALL_DEFINE2(sigaltstack,
- const compat_stack_t __user *, uss_ptr,
- compat_stack_t __user *, uoss_ptr)
- {
- return do_compat_sigaltstack(uss_ptr, uoss_ptr);
- }
- int compat_restore_altstack(const compat_stack_t __user *uss)
- {
- int err = do_compat_sigaltstack(uss, NULL);
-
- return err == -EFAULT ? err : 0;
- }
- int __compat_save_altstack(compat_stack_t __user *uss, unsigned long sp)
- {
- int err;
- struct task_struct *t = current;
- err = __put_user(ptr_to_compat((void __user *)t->sas_ss_sp),
- &uss->ss_sp) |
- __put_user(t->sas_ss_flags, &uss->ss_flags) |
- __put_user(t->sas_ss_size, &uss->ss_size);
- return err;
- }
- #endif
- #ifdef __ARCH_WANT_SYS_SIGPENDING
- SYSCALL_DEFINE1(sigpending, old_sigset_t __user *, uset)
- {
- sigset_t set;
- if (sizeof(old_sigset_t) > sizeof(*uset))
- return -EINVAL;
- do_sigpending(&set);
- if (copy_to_user(uset, &set, sizeof(old_sigset_t)))
- return -EFAULT;
- return 0;
- }
- #ifdef CONFIG_COMPAT
- COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set32)
- {
- sigset_t set;
- do_sigpending(&set);
- return put_user(set.sig[0], set32);
- }
- #endif
- #endif
- #ifdef __ARCH_WANT_SYS_SIGPROCMASK
- SYSCALL_DEFINE3(sigprocmask, int, how, old_sigset_t __user *, nset,
- old_sigset_t __user *, oset)
- {
- old_sigset_t old_set, new_set;
- sigset_t new_blocked;
- old_set = current->blocked.sig[0];
- if (nset) {
- if (copy_from_user(&new_set, nset, sizeof(*nset)))
- return -EFAULT;
- new_blocked = current->blocked;
- switch (how) {
- case SIG_BLOCK:
- sigaddsetmask(&new_blocked, new_set);
- break;
- case SIG_UNBLOCK:
- sigdelsetmask(&new_blocked, new_set);
- break;
- case SIG_SETMASK:
- new_blocked.sig[0] = new_set;
- break;
- default:
- return -EINVAL;
- }
- set_current_blocked(&new_blocked);
- }
- if (oset) {
- if (copy_to_user(oset, &old_set, sizeof(*oset)))
- return -EFAULT;
- }
- return 0;
- }
- #endif
- #ifndef CONFIG_ODD_RT_SIGACTION
- SYSCALL_DEFINE4(rt_sigaction, int, sig,
- const struct sigaction __user *, act,
- struct sigaction __user *, oact,
- size_t, sigsetsize)
- {
- struct k_sigaction new_sa, old_sa;
- int ret;
-
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
- if (act && copy_from_user(&new_sa.sa, act, sizeof(new_sa.sa)))
- return -EFAULT;
- ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
- if (ret)
- return ret;
- if (oact && copy_to_user(oact, &old_sa.sa, sizeof(old_sa.sa)))
- return -EFAULT;
- return 0;
- }
- #ifdef CONFIG_COMPAT
- COMPAT_SYSCALL_DEFINE4(rt_sigaction, int, sig,
- const struct compat_sigaction __user *, act,
- struct compat_sigaction __user *, oact,
- compat_size_t, sigsetsize)
- {
- struct k_sigaction new_ka, old_ka;
- #ifdef __ARCH_HAS_SA_RESTORER
- compat_uptr_t restorer;
- #endif
- int ret;
-
- if (sigsetsize != sizeof(compat_sigset_t))
- return -EINVAL;
- if (act) {
- compat_uptr_t handler;
- ret = get_user(handler, &act->sa_handler);
- new_ka.sa.sa_handler = compat_ptr(handler);
- #ifdef __ARCH_HAS_SA_RESTORER
- ret |= get_user(restorer, &act->sa_restorer);
- new_ka.sa.sa_restorer = compat_ptr(restorer);
- #endif
- ret |= get_compat_sigset(&new_ka.sa.sa_mask, &act->sa_mask);
- ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags);
- if (ret)
- return -EFAULT;
- }
- ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
- if (!ret && oact) {
- ret = put_user(ptr_to_compat(old_ka.sa.sa_handler),
- &oact->sa_handler);
- ret |= put_compat_sigset(&oact->sa_mask, &old_ka.sa.sa_mask,
- sizeof(oact->sa_mask));
- ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags);
- #ifdef __ARCH_HAS_SA_RESTORER
- ret |= put_user(ptr_to_compat(old_ka.sa.sa_restorer),
- &oact->sa_restorer);
- #endif
- }
- return ret;
- }
- #endif
- #endif
- #ifdef CONFIG_OLD_SIGACTION
- SYSCALL_DEFINE3(sigaction, int, sig,
- const struct old_sigaction __user *, act,
- struct old_sigaction __user *, oact)
- {
- struct k_sigaction new_ka, old_ka;
- int ret;
- if (act) {
- old_sigset_t mask;
- if (!access_ok(act, sizeof(*act)) ||
- __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
- __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
- __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
- __get_user(mask, &act->sa_mask))
- return -EFAULT;
- #ifdef __ARCH_HAS_KA_RESTORER
- new_ka.ka_restorer = NULL;
- #endif
- siginitset(&new_ka.sa.sa_mask, mask);
- }
- ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
- if (!ret && oact) {
- if (!access_ok(oact, sizeof(*oact)) ||
- __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
- __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
- __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
- __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
- return -EFAULT;
- }
- return ret;
- }
- #endif
- #ifdef CONFIG_COMPAT_OLD_SIGACTION
- COMPAT_SYSCALL_DEFINE3(sigaction, int, sig,
- const struct compat_old_sigaction __user *, act,
- struct compat_old_sigaction __user *, oact)
- {
- struct k_sigaction new_ka, old_ka;
- int ret;
- compat_old_sigset_t mask;
- compat_uptr_t handler, restorer;
- if (act) {
- if (!access_ok(act, sizeof(*act)) ||
- __get_user(handler, &act->sa_handler) ||
- __get_user(restorer, &act->sa_restorer) ||
- __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
- __get_user(mask, &act->sa_mask))
- return -EFAULT;
- #ifdef __ARCH_HAS_KA_RESTORER
- new_ka.ka_restorer = NULL;
- #endif
- new_ka.sa.sa_handler = compat_ptr(handler);
- new_ka.sa.sa_restorer = compat_ptr(restorer);
- siginitset(&new_ka.sa.sa_mask, mask);
- }
- ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
- if (!ret && oact) {
- if (!access_ok(oact, sizeof(*oact)) ||
- __put_user(ptr_to_compat(old_ka.sa.sa_handler),
- &oact->sa_handler) ||
- __put_user(ptr_to_compat(old_ka.sa.sa_restorer),
- &oact->sa_restorer) ||
- __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
- __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
- return -EFAULT;
- }
- return ret;
- }
- #endif
- #ifdef CONFIG_SGETMASK_SYSCALL
- SYSCALL_DEFINE0(sgetmask)
- {
-
- return current->blocked.sig[0];
- }
- SYSCALL_DEFINE1(ssetmask, int, newmask)
- {
- int old = current->blocked.sig[0];
- sigset_t newset;
- siginitset(&newset, newmask);
- set_current_blocked(&newset);
- return old;
- }
- #endif
- #ifdef __ARCH_WANT_SYS_SIGNAL
- SYSCALL_DEFINE2(signal, int, sig, __sighandler_t, handler)
- {
- struct k_sigaction new_sa, old_sa;
- int ret;
- new_sa.sa.sa_handler = handler;
- new_sa.sa.sa_flags = SA_ONESHOT | SA_NOMASK;
- sigemptyset(&new_sa.sa.sa_mask);
- ret = do_sigaction(sig, &new_sa, &old_sa);
- return ret ? ret : (unsigned long)old_sa.sa.sa_handler;
- }
- #endif
- #ifdef __ARCH_WANT_SYS_PAUSE
- SYSCALL_DEFINE0(pause)
- {
- while (!signal_pending(current)) {
- __set_current_state(TASK_INTERRUPTIBLE);
- schedule();
- }
- return -ERESTARTNOHAND;
- }
- #endif
- static int sigsuspend(sigset_t *set)
- {
- current->saved_sigmask = current->blocked;
- set_current_blocked(set);
- while (!signal_pending(current)) {
- __set_current_state(TASK_INTERRUPTIBLE);
- schedule();
- }
- set_restore_sigmask();
- return -ERESTARTNOHAND;
- }
- SYSCALL_DEFINE2(rt_sigsuspend, sigset_t __user *, unewset, size_t, sigsetsize)
- {
- sigset_t newset;
-
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
- if (copy_from_user(&newset, unewset, sizeof(newset)))
- return -EFAULT;
- return sigsuspend(&newset);
- }
-
- #ifdef CONFIG_COMPAT
- COMPAT_SYSCALL_DEFINE2(rt_sigsuspend, compat_sigset_t __user *, unewset, compat_size_t, sigsetsize)
- {
- sigset_t newset;
-
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
- if (get_compat_sigset(&newset, unewset))
- return -EFAULT;
- return sigsuspend(&newset);
- }
- #endif
- #ifdef CONFIG_OLD_SIGSUSPEND
- SYSCALL_DEFINE1(sigsuspend, old_sigset_t, mask)
- {
- sigset_t blocked;
- siginitset(&blocked, mask);
- return sigsuspend(&blocked);
- }
- #endif
- #ifdef CONFIG_OLD_SIGSUSPEND3
- SYSCALL_DEFINE3(sigsuspend, int, unused1, int, unused2, old_sigset_t, mask)
- {
- sigset_t blocked;
- siginitset(&blocked, mask);
- return sigsuspend(&blocked);
- }
- #endif
- __weak const char *arch_vma_name(struct vm_area_struct *vma)
- {
- return NULL;
- }
- static inline void siginfo_buildtime_checks(void)
- {
- BUILD_BUG_ON(sizeof(struct siginfo) != SI_MAX_SIZE);
-
- #define CHECK_OFFSET(field) \
- BUILD_BUG_ON(offsetof(siginfo_t, field) != offsetof(kernel_siginfo_t, field))
-
- CHECK_OFFSET(si_pid);
- CHECK_OFFSET(si_uid);
-
- CHECK_OFFSET(si_tid);
- CHECK_OFFSET(si_overrun);
- CHECK_OFFSET(si_value);
-
- CHECK_OFFSET(si_pid);
- CHECK_OFFSET(si_uid);
- CHECK_OFFSET(si_value);
-
- CHECK_OFFSET(si_pid);
- CHECK_OFFSET(si_uid);
- CHECK_OFFSET(si_status);
- CHECK_OFFSET(si_utime);
- CHECK_OFFSET(si_stime);
-
- CHECK_OFFSET(si_addr);
- CHECK_OFFSET(si_trapno);
- CHECK_OFFSET(si_addr_lsb);
- CHECK_OFFSET(si_lower);
- CHECK_OFFSET(si_upper);
- CHECK_OFFSET(si_pkey);
- CHECK_OFFSET(si_perf_data);
- CHECK_OFFSET(si_perf_type);
- CHECK_OFFSET(si_perf_flags);
-
- CHECK_OFFSET(si_band);
- CHECK_OFFSET(si_fd);
-
- CHECK_OFFSET(si_call_addr);
- CHECK_OFFSET(si_syscall);
- CHECK_OFFSET(si_arch);
- #undef CHECK_OFFSET
-
- BUILD_BUG_ON(offsetof(struct siginfo, si_pid) !=
- offsetof(struct siginfo, si_addr));
- if (sizeof(int) == sizeof(void __user *)) {
- BUILD_BUG_ON(sizeof_field(struct siginfo, si_pid) !=
- sizeof(void __user *));
- } else {
- BUILD_BUG_ON((sizeof_field(struct siginfo, si_pid) +
- sizeof_field(struct siginfo, si_uid)) !=
- sizeof(void __user *));
- BUILD_BUG_ON(offsetofend(struct siginfo, si_pid) !=
- offsetof(struct siginfo, si_uid));
- }
- #ifdef CONFIG_COMPAT
- BUILD_BUG_ON(offsetof(struct compat_siginfo, si_pid) !=
- offsetof(struct compat_siginfo, si_addr));
- BUILD_BUG_ON(sizeof_field(struct compat_siginfo, si_pid) !=
- sizeof(compat_uptr_t));
- BUILD_BUG_ON(sizeof_field(struct compat_siginfo, si_pid) !=
- sizeof_field(struct siginfo, si_pid));
- #endif
- }
- void __init signals_init(void)
- {
- siginfo_buildtime_checks();
- sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC | SLAB_ACCOUNT);
- }
- #ifdef CONFIG_KGDB_KDB
- #include <linux/kdb.h>
- void kdb_send_sig(struct task_struct *t, int sig)
- {
- static struct task_struct *kdb_prev_t;
- int new_t, ret;
- if (!spin_trylock(&t->sighand->siglock)) {
- kdb_printf("Can't do kill command now.\n"
- "The sigmask lock is held somewhere else in "
- "kernel, try again later\n");
- return;
- }
- new_t = kdb_prev_t != t;
- kdb_prev_t = t;
- if (!task_is_running(t) && new_t) {
- spin_unlock(&t->sighand->siglock);
- kdb_printf("Process is not RUNNING, sending a signal from "
- "kdb risks deadlock\n"
- "on the run queue locks. "
- "The signal has _not_ been sent.\n"
- "Reissue the kill command if you want to risk "
- "the deadlock.\n");
- return;
- }
- ret = send_signal_locked(sig, SEND_SIG_PRIV, t, PIDTYPE_PID);
- spin_unlock(&t->sighand->siglock);
- if (ret)
- kdb_printf("Fail to deliver Signal %d to process %d.\n",
- sig, t->pid);
- else
- kdb_printf("Signal %d is sent to process %d.\n", sig, t->pid);
- }
- #endif
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