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authorThomas Gleixner <tglx@linutronix.de>2018-06-26 16:21:31 +0300
committerThomas Gleixner <tglx@linutronix.de>2018-07-02 12:33:25 +0300
commit6fec64e1c92d5c715c6d0f50786daa7708266bde (patch)
tree1d94835987721b47b135175daf2524835c762335 /kernel/time
parent6ff84735070276d72af716e21c3214ee20d60e70 (diff)
downloadlinux-6fec64e1c92d5c715c6d0f50786daa7708266bde.tar.xz
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')
-rw-r--r--kernel/time/alarmtimer.c4
-rw-r--r--kernel/time/posix-timers.c6
-rw-r--r--kernel/time/posix-timers.h2
3 files changed, 6 insertions, 6 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 639321bf2e39..78a3cc555823 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -581,11 +581,11 @@ static void alarm_timer_rearm(struct k_itimer *timr)
* @timr: Pointer to the posixtimer data struct
* @now: Current time to forward the timer against
*/
-static int alarm_timer_forward(struct k_itimer *timr, ktime_t now)
+static s64 alarm_timer_forward(struct k_itimer *timr, ktime_t now)
{
struct alarm *alarm = &timr->it.alarm.alarmtimer;
- return (int) alarm_forward(alarm, timr->it_interval, now);
+ return alarm_forward(alarm, timr->it_interval, now);
}
/**
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 */
diff --git a/kernel/time/posix-timers.h b/kernel/time/posix-timers.h
index 151e28f5bf30..ddb21145211a 100644
--- a/kernel/time/posix-timers.h
+++ b/kernel/time/posix-timers.h
@@ -19,7 +19,7 @@ struct k_clock {
void (*timer_get)(struct k_itimer *timr,
struct itimerspec64 *cur_setting);
void (*timer_rearm)(struct k_itimer *timr);
- int (*timer_forward)(struct k_itimer *timr, ktime_t now);
+ s64 (*timer_forward)(struct k_itimer *timr, ktime_t now);
ktime_t (*timer_remaining)(struct k_itimer *timr, ktime_t now);
int (*timer_try_to_cancel)(struct k_itimer *timr);
void (*timer_arm)(struct k_itimer *timr, ktime_t expires,