diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2011-07-26 16:08:19 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-04 21:58:32 -0700 |
| commit | ec054bbddbd0841174f4d5c3a4685eca9f9a9f93 (patch) | |
| tree | 9dd215bf9b04bfb69e78c6da3c6f1d33ed62608c /drivers/rtc/interface.c | |
| parent | e9c5291ba063473a5560d3387773e9a6997bad65 (diff) | |
| download | lwn-ec054bbddbd0841174f4d5c3a4685eca9f9a9f93.tar.gz lwn-ec054bbddbd0841174f4d5c3a4685eca9f9a9f93.zip | |
rtc: limit frequency
commit 431e2bcc371016824f419baa745f82388258f3ee upstream.
Due to the hrtimer self rearming mode a user can DoS the machine simply
because it's starved by hrtimer events.
The RTC hrtimer is self rearming. We really need to limit the frequency
to something sensible.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ben Greear <greearb@candelatech.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/rtc/interface.c')
| -rw-r--r-- | drivers/rtc/interface.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index 0900dfea3ae7..3195dbd3ec34 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -708,7 +708,7 @@ int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq) int err = 0; unsigned long flags; - if (freq <= 0) + if (freq <= 0 || freq > 5000) return -EINVAL; retry: spin_lock_irqsave(&rtc->irq_task_lock, flags); |