diff options
| author |   Thomas Gleixner <tglx@linutronix.de> | 2018-12-17 13:31:05 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-12-17 17:35:45 +0100 |
| commit | 0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94 (patch) | |
| tree | e10400116050673c0667f7cac51f4aed72ea27f6 | |
| parent | Linux 4.20-rc7 (diff) | |
| download | linux-dev-0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94.tar.xz linux-dev-0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94.zip | |
posix-timers: Fix division by zero bug
The signal delivery path of posix-timers can try to rearm the timer even if
the interval is zero. That's handled for the common case (hrtimer) but not
for alarm timers. In that case the forwarding function raises a division by
zero exception.
The handling for hrtimer based posix timers is wrong because it marks the
timer as active despite the fact that it is stopped.
Move the check from common_hrtimer_rearm() to posixtimer_rearm() to cure
both issues.
Reported-by: syzbot+9d38bedac9cc77b8ad5e@syzkaller.appspotmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: sboyd@kernel.org
Cc: stable@vger.kernel.org
Cc: syzkaller-bugs@googlegroups.com
Link: http://lkml.kernel.org/r/alpine.DEB.2.21.1812171328050.1880@nanos.tec.linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | kernel/time/posix-timers.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index bd62b5eeb5a0..31f49ae80f43 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -289,9 +289,6 @@ static void common_hrtimer_rearm(struct k_itimer *timr) { struct hrtimer *timer = &timr->it.real.timer; - if (!timr->it_interval) - return; - timr->it_overrun += hrtimer_forward(timer, timer->base->get_time(), timr->it_interval); hrtimer_restart(timer); @@ -317,7 +314,7 @@ void posixtimer_rearm(struct kernel_siginfo *info) if (!timr) return; - if (timr->it_requeue_pending == info->si_sys_private) { + if (timr->it_interval && timr->it_requeue_pending == info->si_sys_private) { timr->kclock->timer_rearm(timr); timr->it_active = 1; |