linux-kernel - Re: [PATCH] time: create __getnstimeofday for WARNless calls

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Message-ID: <CAGXu5jLtfoxPC-4d-StwWuuowMOFjzVsnzPn7wRhdaTAbiS43Q@mail.gmail.com>
Date:	Fri, 14 Dec 2012 23:22:10 -0800
From:	Kees Cook <keescook@...omium.org>
To:	John Stultz <johnstul@...ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Anton Vorontsov <cbouatmailru@...il.com>,
	Colin Cross <ccross@...roid.com>,
	Tony Luck <tony.luck@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Anton Vorontsov <anton.vorontsov@...aro.org>
Subject: Re: [PATCH] time: create __getnstimeofday for WARNless calls

On Fri, Dec 14, 2012 at 5:16 PM, John Stultz <johnstul@...ibm.com> wrote:
> On 12/13/2012 10:17 AM, Kees Cook wrote:
>>
>> John, any feedback on this?
>>
> Sorry, yea, I've been meaning to get back to this.
>
> I'm still on the fence about just making getnstimeofday() safe for when
> timekeeping is suspended, but at the same time, your issue needs fixing.
> Also bailing out at the end still seems off to me. Even if someone is using
> the values despite the WARN_ON, they really are getting junk values, and for
> all the time that WARN_ON has been there, you're the first to report running
> into it.
>
> Even so, I think I'm ok with this patch for now, but I suspect we may want
> to rework it later.
>
> Looking at my inbox, I actually can't find a copy of this specific patch. Do
> you mind bouncing it to me, so I have something I can apply?
>
> Should this also get marked for -stable?

Nah, I don't think it's worth it.

Thanks!

-Kees

-- 
Kees Cook
Chrome OS Security
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