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ptrace_untrace: fix the SIGNAL_STOP_STOPPED check

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This bug is ancient too. ptrace_untrace() must not resume the task
if the group stop in progress, we should set TASK_STOPPED instead.

Unfortunately, we still have problems here:

	- if the process/thread was traced, SIGNAL_STOP_STOPPED
	  does not necessary means this thread group is stopped.

	- ptrace breaks the bookkeeping of ->group_stop_count.

Signed-off-by: Oleg Nesterov <[email protected]>
Cc: Jerome Marchand <[email protected]>
Cc: Roland McGrath <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Oleg Nesterov 2009-04-02 16:58:23 -07:00 • committed by Linus Torvalds
commit 1ee1184485
1 changed files with 7 additions and 3 deletions
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10
kernel/ptrace.c
View file

@ -60,11 +60,15 @@ static void ptrace_untrace(struct task_struct *child)
{
spin_lock(&child->sighand->siglock);
if (task_is_traced(child)) {
if (child->signal->flags & SIGNAL_STOP_STOPPED) {
/*
* If the group stop is completed or in progress,
* this thread was already counted as stopped.
*/
if (child->signal->flags & SIGNAL_STOP_STOPPED ||
child->signal->group_stop_count)
__set_task_state(child, TASK_STOPPED);
} else {
else
signal_wake_up(child, 1);
}
}
spin_unlock(&child->sighand->siglock);
}