This is a note to let you know that I've just added the patch titled
alarmtimer: don't rate limit one-shot timers
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alarmtimer-don-t-rate-limit-one-shot-timers.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ghackmann@xxxxxxxxxx Tue Jul 25 10:58:26 2017
From: Greg Hackmann <ghackmann@xxxxxxxxxx>
Date: Mon, 24 Jul 2017 10:19:24 -0700
Subject: alarmtimer: don't rate limit one-shot timers
To: John Stultz <john.stultz@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ben Fennema <fennema@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Greg Hackmann <ghackmann@xxxxxxxxxx>, stable@xxxxxxxxxxxxxxx
Message-ID: <20170724171924.27898-1-ghackmann@xxxxxxxxxx>
From: Greg Hackmann <ghackmann@xxxxxxxxxx>
Commit ff86bf0c65f1 ("alarmtimer: Rate limit periodic intervals") sets a
minimum bound on the alarm timer interval. This minimum bound shouldn't
be applied if the interval is 0. Otherwise, one-shot timers will be
converted into periodic ones.
Fixes: ff86bf0c65f1 ("alarmtimer: Rate limit periodic intervals")
Reported-by: Ben Fennema <fennema@xxxxxxxxxx>
Signed-off-by: Greg Hackmann <ghackmann@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: John Stultz <john.stultz@xxxxxxxxxx>
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/time/alarmtimer.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -616,7 +616,8 @@ static int alarm_timer_set(struct k_itim
* 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)
+ if (timr->it.alarm.interval.tv64 &&
+ 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);
Patches currently in stable-queue which might be from ghackmann@xxxxxxxxxx are
queue-4.4/alarmtimer-don-t-rate-limit-one-shot-timers.patch