On 08/12, Oleg Nesterov wrote:
>
> > > - spin_unlock_irqrestore(&process->sighand->siglock, flags);
> > > process = NULL;
> > > }
> > > + spin_unlock_irqrestore(&process->sighand->siglock, flags);
>
> i'll resend this patch tomorrow. We can't do spin_unlock_irqrestore(&process->...)
> if we set process = NULL above.
Another attempt, no cleanups, just a minimal fix for now.
[PATCH 2/4] posix-timers: fix creation race
sys_timer_create() sets ->it_process and unlocks ->siglock, then checks
tmr->it_sigev_notify to define if get_task_struct() is needed.
We already passed ->it_id to the caller, another thread can delete this
timer and free its memory in between.
As a minimal fix, move this code under ->siglock, sys_timer_delete() takes
it too before calling release_posix_timer(). A proper serialization would
be to take ->it_lock, we add a partly initialized timer on posix_timers_id,
not good.
Signed-off-by: Oleg Nesterov <[email protected]>
--- t/kernel/posix-timers.c~ 2007-08-12 23:50:46.000000000 +0400
+++ t/kernel/posix-timers.c 2007-08-12 23:52:07.000000000 +0400
@@ -547,9 +547,9 @@ sys_timer_create(const clockid_t which_c
new_timer->it_process = process;
list_add(&new_timer->list,
&process->signal->posix_timers);
- spin_unlock_irqrestore(&process->sighand->siglock, flags);
if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
get_task_struct(process);
+ spin_unlock_irqrestore(&process->sighand->siglock, flags);
} else {
spin_unlock_irqrestore(&process->sighand->siglock, flags);
process = NULL;
-
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