diff options
author | Alex Shi <alex.shi@linaro.org> | 2017-06-30 14:26:00 +0800 |
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committer | Alex Shi <alex.shi@linaro.org> | 2017-06-30 14:26:00 +0800 |
commit | 267aa95e09eec438abf8979b58cded5cbc5586cb (patch) | |
tree | 7401fc52691565f31c0ad96a94a7a54971cc6e6a /kernel/time/alarmtimer.c | |
parent | d87abdcbf8871b5ee58083b3bdf216ba406224b9 (diff) | |
parent | 6ee496d7218aeccffe5380cb65e9d50d1a61c323 (diff) |
Merge tag 'v4.4.75' into linux-linaro-lsk-v4.4lsk-v4.4-17.06
This is the 4.4.75 stable release
Diffstat (limited to 'kernel/time/alarmtimer.c')
-rw-r--r-- | kernel/time/alarmtimer.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c index 7fbba635a549..2c3a23d77704 100644 --- a/kernel/time/alarmtimer.c +++ b/kernel/time/alarmtimer.c @@ -339,7 +339,7 @@ void alarm_start_relative(struct alarm *alarm, ktime_t start) { struct alarm_base *base = &alarm_bases[alarm->type]; - start = ktime_add(start, base->gettime()); + start = ktime_add_safe(start, base->gettime()); alarm_start(alarm, start); } EXPORT_SYMBOL_GPL(alarm_start_relative); @@ -425,7 +425,7 @@ u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval) overrun++; } - alarm->node.expires = ktime_add(alarm->node.expires, interval); + alarm->node.expires = ktime_add_safe(alarm->node.expires, interval); return overrun; } EXPORT_SYMBOL_GPL(alarm_forward); @@ -611,13 +611,21 @@ static int alarm_timer_set(struct k_itimer *timr, int flags, /* start the timer */ timr->it.alarm.interval = timespec_to_ktime(new_setting->it_interval); + + /* + * Rate limit to the tick as a hot fix to prevent DOS. Will be + * mopped up later. + */ + if (ktime_to_ns(timr->it.alarm.interval) < TICK_NSEC) + timr->it.alarm.interval = ktime_set(0, TICK_NSEC); + exp = timespec_to_ktime(new_setting->it_value); /* Convert (if necessary) to absolute time */ if (flags != TIMER_ABSTIME) { ktime_t now; now = alarm_bases[timr->it.alarm.alarmtimer.type].gettime(); - exp = ktime_add(now, exp); + exp = ktime_add_safe(now, exp); } alarm_start(&timr->it.alarm.alarmtimer, exp); |