[PATCH] hrtimer: prevent overrun DoS in hrtimer_forward()
commit13788ccc41ceea5893f9c747c59bc0b28f2416c2
authorThomas Gleixner <tglx@linutronix.de>
Fri, 16 Mar 2007 21:38:20 +0000 (16 13:38 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Sat, 17 Mar 2007 02:25:05 +0000 (16 19:25 -0700)
tree34cc13deaf8e7209def55edfad1912f308bf8c0d
parentd8ad7e0b84bde480d295ef1e0381c0c6050f57b3
[PATCH] hrtimer: prevent overrun DoS in hrtimer_forward()

hrtimer_forward() does not check for the possible overflow of
timer->expires.  This can happen on 64 bit machines with large interval
values and results currently in an endless loop in the softirq because the
expiry value becomes negative and therefor the timer is expired all the
time.

Check for this condition and set the expiry value to the max.  expiry time
in the future.  The fix should be applied to stable kernel series as well.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/hrtimer.c