This is a note to let you know that I've just added the patch titled
rtc: limit frequency
to the 3.0-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:
rtc-limit-frequency.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 431e2bcc371016824f419baa745f82388258f3ee Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <[email protected]>
Date: Tue, 26 Jul 2011 16:08:19 -0700
Subject: rtc: limit frequency
From: Thomas Gleixner <[email protected]>
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 <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Ben Greear <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/rtc/interface.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -708,7 +708,7 @@ int rtc_irq_set_freq(struct rtc_device *
int err = 0;
unsigned long flags;
- if (freq <= 0)
+ if (freq <= 0 || freq > 5000)
return -EINVAL;
retry:
spin_lock_irqsave(&rtc->irq_task_lock, flags);
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/rtc-fix-hrtimer-deadlock.patch
queue-3.0/rtc-handle-errors-correctly-in-rtc_irq_set_state.patch
queue-3.0/rtc-limit-frequency.patch
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