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posix-timers: fix creation race

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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 <oleg@tv-sign.ru>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2007-08-22 14:01:37 -07:00 committed by Linus Torvalds
parent 179394af7a
commit d02479bdeb
1 changed files with 1 additions and 1 deletions
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2
kernel/posix-timers.c
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@ -547,9 +547,9 @@ sys_timer_create(const clockid_t which_clock,
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;