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| author | Thomas Gleixner <tglx@linutronix.de> | 2011-07-26 16:08:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-26 16:49:42 -0700 |
| commit | 431e2bcc371016824f419baa745f82388258f3ee (patch) | |
| tree | 11ed612c73773e5e61160efa6ff5f0c3efe5c936 | |
| parent | 2c4f57d12df7696d65b0247bfd57fd082a7719e6 (diff) | |
| download | linux-431e2bcc371016824f419baa745f82388258f3ee.tar.gz linux-431e2bcc371016824f419baa745f82388258f3ee.tar.bz2 linux-431e2bcc371016824f419baa745f82388258f3ee.zip | |
rtc: limit frequency
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>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -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 b6bf57f25cc9..601b053bc0e5 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -688,7 +688,7 @@ 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; spin_lock_irqsave(&rtc->irq_task_lock, flags); |