diff options
author | Linus Walleij <linus.walleij@linaro.org> | 2017-06-29 14:27:39 +0200 |
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committer | Linus Walleij <linus.walleij@linaro.org> | 2017-06-29 14:27:39 +0200 |
commit | 61830619675b97d3da34c59c71ae51646a205e2c (patch) | |
tree | e6d39f81284bdb86ba4214c89994fb454074f583 /kernel/time/alarmtimer.c | |
parent | 8137f78a7fedeef1ffc0ac36e0ad68960eaf5010 (diff) | |
parent | c0bc126f97fb929b3ae02c1c62322645d70eb408 (diff) |
Merge tag 'v4.12-rc7' into devel
Linux 4.12-rc7
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 5cb5b0008d97..ee2f4202d82a 100644 --- a/kernel/time/alarmtimer.c +++ b/kernel/time/alarmtimer.c @@ -387,7 +387,7 @@ 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); @@ -475,7 +475,7 @@ 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); @@ -660,13 +660,21 @@ static int alarm_timer_set(struct k_itimer *timr, int flags, /* start the timer */ timr->it.alarm.interval = timespec64_to_ktime(new_setting->it_interval); + + /* + * Rate limit to the tick as a hot fix to prevent DOS. Will be + * mopped up later. + */ + if (timr->it.alarm.interval < TICK_NSEC) + timr->it.alarm.interval = TICK_NSEC; + exp = timespec64_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); |