mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
[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>
This commit is contained in:
parent
d8ad7e0b84
commit
13788ccc41
1 changed files with 6 additions and 0 deletions
|
@ -644,6 +644,12 @@ hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
|
|||
orun++;
|
||||
}
|
||||
timer->expires = ktime_add(timer->expires, interval);
|
||||
/*
|
||||
* Make sure, that the result did not wrap with a very large
|
||||
* interval.
|
||||
*/
|
||||
if (timer->expires.tv64 < 0)
|
||||
timer->expires = ktime_set(KTIME_SEC_MAX, 0);
|
||||
|
||||
return orun;
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue