From: Thomas Gleixner <[email protected]> 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 <[email protected]> Cc: John Stultz <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Ben Greear <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> --- drivers/rtc/interface.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN drivers/rtc/interface.c~rtc-limit-frequency drivers/rtc/interface.c --- a/drivers/rtc/interface.c~rtc-limit-frequency +++ a/drivers/rtc/interface.c @@ -688,7 +688,7 @@ int rtc_irq_set_freq(struct rtc_device * int err = 0; unsigned long flags; - if (freq <= 0) + if (freq <= 0 || freq > 5000) return -EINVAL; spin_lock_irqsave(&rtc->irq_task_lock, flags); _ _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
