diff options
author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-04-30 07:52:44 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 15:29:34 (GMT) |
commit | e442055193e4584218006e616c9bdce0c5e9ae5c (patch) | |
tree | 5e444253953c2f48c0a194bf8c5799f03bb2e266 /kernel/signal.c | |
parent | 3b5e9e53c6f31b5a5a0f5c43707503c62bdefa46 (diff) | |
download | linux-fsl-qoriq-e442055193e4584218006e616c9bdce0c5e9ae5c.tar.xz |
signals: re-assign CLD_CONTINUED notification from the sender to reciever
Based on discussion with Jiri and Roland.
In short: currently handle_stop_signal(SIGCONT, p) sends the notification to
p->parent, with this patch p itself notifies its parent when it becomes
running.
handle_stop_signal(SIGCONT) has to drop ->siglock temporary in order to notify
the parent with do_notify_parent_cldstop(). This leads to multiple problems:
- as Jiri Kosina pointed out, the stopped task can resume without
actually seeing SIGCONT which may have a handler.
- we race with another sig_kernel_stop() signal which may come in
that window.
- we race with sig_fatal() signals which may set SIGNAL_GROUP_EXIT
in that window.
- we can't avoid taking tasklist_lock() while sending SIGCONT.
With this patch handle_stop_signal() just sets the new SIGNAL_CLD_CONTINUED
flag in p->signal->flags and returns. The notification is sent by the first
task which returns from finish_stop() (there should be at least one) or any
other signalled thread from get_signal_to_deliver().
This is a user-visible change. Say, currently kill(SIGCONT, stopped_child)
can't return without seeing SIGCHLD, with this patch SIGCHLD can be delayed
unpredictably. Another difference is that if the child is ptraced by another
process, CLD_CONTINUED may be delivered to ->real_parent after ptrace_detach()
while currently it always goes to the tracer which doesn't actually need this
notification. Hopefully not a problem.
The patch asks for the futher obvious cleanups, I'll send them separately.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r-- | kernel/signal.c | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index 91d57f8..115c04f 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -603,10 +603,8 @@ static void handle_stop_signal(int sig, struct task_struct *p) * the SIGCHLD was pending on entry to this kill. */ p->signal->group_stop_count = 0; - p->signal->flags = SIGNAL_STOP_CONTINUED; - spin_unlock(&p->sighand->siglock); - do_notify_parent_cldstop(p, CLD_STOPPED); - spin_lock(&p->sighand->siglock); + p->signal->flags = SIGNAL_STOP_CONTINUED | + SIGNAL_CLD_STOPPED; } rm_from_queue(SIG_KERNEL_STOP_MASK, &p->signal->shared_pending); t = p; @@ -643,25 +641,23 @@ static void handle_stop_signal(int sig, struct task_struct *p) * We were in fact stopped, and are now continued. * Notify the parent with CLD_CONTINUED. */ - p->signal->flags = SIGNAL_STOP_CONTINUED; + p->signal->flags = SIGNAL_STOP_CONTINUED | + SIGNAL_CLD_CONTINUED; p->signal->group_exit_code = 0; - spin_unlock(&p->sighand->siglock); - do_notify_parent_cldstop(p, CLD_CONTINUED); - spin_lock(&p->sighand->siglock); } else { /* * We are not stopped, but there could be a stop * signal in the middle of being processed after * being removed from the queue. Clear that too. */ - p->signal->flags = 0; + p->signal->flags &= ~SIGNAL_STOP_DEQUEUED; } } else if (sig == SIGKILL) { /* * Make sure that any pending stop signal already dequeued * is undone by the wakeup for SIGKILL. */ - p->signal->flags = 0; + p->signal->flags &= ~SIGNAL_STOP_DEQUEUED; } } @@ -1784,6 +1780,19 @@ relock: try_to_freeze(); spin_lock_irq(¤t->sighand->siglock); + + if (unlikely(current->signal->flags & SIGNAL_CLD_MASK)) { + int why = (current->signal->flags & SIGNAL_STOP_CONTINUED) + ? CLD_CONTINUED : CLD_STOPPED; + current->signal->flags &= ~SIGNAL_CLD_MASK; + spin_unlock_irq(¤t->sighand->siglock); + + read_lock(&tasklist_lock); + do_notify_parent_cldstop(current->group_leader, why); + read_unlock(&tasklist_lock); + goto relock; + } + for (;;) { struct k_sigaction *ka; |