linux-kernel - Re: [PATCH] hrtimer: prevent overrun DoS in hrtimer

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Date:	Sun, 18 Mar 2007 17:16:43 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	tglx@...utronix.de
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Bauer <JohannesBauer@....de>,
	linux-kernel@...r.kernel.org, schwab@...e.de,
	Stable Kernel Team <stable@...nel.org>,
	Greg KH <greg@...ah.com>, Adrian Bunk <bunk@...sta.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] hrtimer: prevent overrun DoS in hrtimer_forward()

Thomas Gleixner wrote:
> 
> I'd prefer this one: The maximum seconds value we can handle on 32bit is
> LONG_MAX.
> 
> diff --git a/include/linux/ktime.h b/include/linux/ktime.h
> index c68c7ac..248305b 100644
> --- a/include/linux/ktime.h
> +++ b/include/linux/ktime.h
> @@ -57,7 +57,11 @@ typedef union {
>  } ktime_t;
>  
>  #define KTIME_MAX			((s64)~((u64)1 << 63))
> -#define KTIME_SEC_MAX			(KTIME_MAX / NSEC_PER_SEC)
> +#if (BITS_PER_LONG == 64)
> +# define KTIME_SEC_MAX			(KTIME_MAX / NSEC_PER_SEC)
> +#else
> +# define KTIME_SEC_MAX			LONG_MAX
> +#endif
>  
>  /*
>   * ktime_t definitions when using the 64-bit scalar representation:
> 

Just to be clear: this replaces the earlier patch, right?




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