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

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Date:	Sun, 18 Mar 2007 22:32:59 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Chuck Ebbert <cebbert@...hat.com>
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()

On Sun, 2007-03-18 at 17:16 -0400, Chuck Ebbert wrote:
> 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?

This replaces the fix Andrew did.

http://marc.info/?l=linux-kernel&m=117407812411997&w=2

	tglx


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