diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/ptrace.c | 16 | ||||
| -rw-r--r-- | kernel/signal.c | 10 |
2 files changed, 21 insertions, 5 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 36a5b7a00d2f..328a34a99124 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -185,7 +185,12 @@ static bool looks_like_a_spurious_pid(struct task_struct *task) return true; } -/* Ensure that nothing can wake it up, even SIGKILL */ +/* + * Ensure that nothing can wake it up, even SIGKILL + * + * A task is switched to this state while a ptrace operation is in progress; + * such that the ptrace operation is uninterruptible. + */ static bool ptrace_freeze_traced(struct task_struct *task) { bool ret = false; @@ -216,8 +221,10 @@ static void ptrace_unfreeze_traced(struct task_struct *task) */ if (lock_task_sighand(task, &flags)) { task->jobctl &= ~JOBCTL_PTRACE_FROZEN; - if (__fatal_signal_pending(task)) + if (__fatal_signal_pending(task)) { + task->jobctl &= ~TASK_TRACED; wake_up_state(task, __TASK_TRACED); + } unlock_task_sighand(task, &flags); } } @@ -462,8 +469,10 @@ static int ptrace_attach(struct task_struct *task, long request, * in and out of STOPPED are protected by siglock. */ if (task_is_stopped(task) && - task_set_jobctl_pending(task, JOBCTL_TRAP_STOP | JOBCTL_TRAPPING)) + task_set_jobctl_pending(task, JOBCTL_TRAP_STOP | JOBCTL_TRAPPING)) { + task->jobctl &= ~JOBCTL_STOPPED; signal_wake_up_state(task, __TASK_STOPPED); + } spin_unlock(&task->sighand->siglock); @@ -875,6 +884,7 @@ static int ptrace_resume(struct task_struct *child, long request, */ spin_lock_irq(&child->sighand->siglock); child->exit_code = data; + child->jobctl &= ~JOBCTL_TRACED; wake_up_state(child, __TASK_TRACED); spin_unlock_irq(&child->sighand->siglock); diff --git a/kernel/signal.c b/kernel/signal.c index a58b68a2d3c6..e782c2611b64 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -762,7 +762,10 @@ still_pending: */ 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); + /* * TASK_WAKEKILL also means wake it up in the stopped/traced/killable * case. We don't check t->state here because there is a race with it @@ -930,9 +933,10 @@ static bool prepare_signal(int sig, struct task_struct *p, bool force) 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))) + if (likely(!(t->ptrace & PT_SEIZED))) { + t->jobctl &= ~JOBCTL_STOPPED; wake_up_state(t, __TASK_STOPPED); - else + } else ptrace_trap_notify(t); } @@ -2218,6 +2222,7 @@ static int ptrace_stop(int exit_code, int why, unsigned long message, return exit_code; set_special_state(TASK_TRACED); + current->jobctl |= JOBCTL_TRACED; /* * We're committing to trapping. TRACED should be visible before @@ -2436,6 +2441,7 @@ static bool do_signal_stop(int signr) if (task_participate_group_stop(current)) notify = CLD_STOPPED; + current->jobctl |= JOBCTL_STOPPED; set_special_state(TASK_STOPPED); spin_unlock_irq(¤t->sighand->siglock); |