diff options
Diffstat (limited to 'kernel/signal.c')
| -rw-r--r-- | kernel/signal.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index 69d60540a680..9f10b246fd46 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1898,10 +1898,18 @@ retry: __set_current_state(TASK_STOPPED); spin_unlock_irq(¤t->sighand->siglock); + /* + * Notify the parent of the group stop completion. Because + * we're not holding either the siglock or tasklist_lock + * here, ptracer may attach inbetween; however, this is for + * group stop and should always be delivered to the real + * parent of the group leader. The new ptracer will get + * its notification when this task transitions into + * TASK_TRACED. + */ if (notify) { read_lock(&tasklist_lock); - do_notify_parent_cldstop(current, task_ptrace(current), - notify); + do_notify_parent_cldstop(current, false, notify); read_unlock(&tasklist_lock); } @@ -2182,9 +2190,13 @@ void exit_signals(struct task_struct *tsk) out: spin_unlock_irq(&tsk->sighand->siglock); + /* + * If group stop has completed, deliver the notification. This + * should always go to the real parent of the group leader. + */ if (unlikely(group_stop)) { read_lock(&tasklist_lock); - do_notify_parent_cldstop(tsk, task_ptrace(tsk), group_stop); + do_notify_parent_cldstop(tsk, false, group_stop); read_unlock(&tasklist_lock); } } |