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| author | Thomas Gleixner <tglx@linutronix.de> | 2018-06-26 15:21:31 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-07-02 11:33:25 +0200 |
| commit | 6fec64e1c92d5c715c6d0f50786daa7708266bde (patch) | |
| tree | 1d94835987721b47b135175daf2524835c762335 /kernel/time/posix-timers.c | |
| parent | time: Change types to new y2038 safe __kernel_itimerspec (diff) | |
| download | linux-6fec64e1c92d5c715c6d0f50786daa7708266bde.tar.xz linux-6fec64e1c92d5c715c6d0f50786daa7708266bde.zip | |
posix-timers: Make forward callback return s64
The posix timer ti_overrun handling is broken because the forwarding
functions can return a huge number of overruns which does not fit in an
int. As a consequence timer_getoverrun(2) and siginfo::si_overrun can turn
into random number generators.
As a first step to address that let the timer_forward() callbacks return
the full 64 bit value.
Cast it to (int) temporarily until k_itimer::ti_overrun is converted to
64bit and the conversion to user space visible values is sanitized.
Reported-by: Team OWL337 <icytxw@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <john.stultz@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Link: https://lkml.kernel.org/r/20180626132704.922098090@linutronix.de
Diffstat (limited to 'kernel/time/posix-timers.c')
| -rw-r--r-- | kernel/time/posix-timers.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index 80d59333c76e..db1d65963a57 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -645,11 +645,11 @@ static ktime_t common_hrtimer_remaining(struct k_itimer *timr, ktime_t now) return __hrtimer_expires_remaining_adjusted(timer, now); } -static int common_hrtimer_forward(struct k_itimer *timr, ktime_t now) +static s64 common_hrtimer_forward(struct k_itimer *timr, ktime_t now) { struct hrtimer *timer = &timr->it.real.timer; - return (int)hrtimer_forward(timer, now, timr->it_interval); + return hrtimer_forward(timer, now, timr->it_interval); } /* @@ -702,7 +702,7 @@ void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting) * expiry time forward by intervals, so expiry is > now. */ if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || sig_none)) - timr->it_overrun += kc->timer_forward(timr, now); + timr->it_overrun += (int)kc->timer_forward(timr, now); remaining = kc->timer_remaining(timr, now); /* Return 0 only, when the timer is expired and not pending */ |