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authorThomas Gleixner <tglx@linutronix.de>2011-07-26 23:08:19 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-26 23:49:42 (GMT)
commit431e2bcc371016824f419baa745f82388258f3ee (patch)
tree11ed612c73773e5e61160efa6ff5f0c3efe5c936
parent2c4f57d12df7696d65b0247bfd57fd082a7719e6 (diff)
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.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index b6bf57f..601b053 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);

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