netdev - Re: [PATCHv3 linux-next] hrtimer: Add notifier when clock_was

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CANcMJZCvoynPh4rCkKfnGTHeG2evpKwS0gj_VLmFtmbRusmEog@mail.gmail.com>
Date:	Thu, 12 Sep 2013 13:35:02 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Fan Du <fan.du@...driver.com>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	David Miller <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCHv3 linux-next] hrtimer: Add notifier when clock_was_set was called

On Thu, Sep 12, 2013 at 6:44 AM, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> On Thu, Sep 12, 2013 at 03:21:24PM +0200, Thomas Gleixner wrote:
>>
>> > (3): http://www.spinics.net/lists/netdev/msg245169.html
>>
>> Thanks for the explanation so far.
>>
>> What's still unclear to me is why these timeouts are bound to wall
>> time in the first place.
>>
>> Is there any real reason why the key life time can't simply be
>> expressed in monotonic time, e.g. N seconds after creation or M
>> seconds after usage? Looking at the relevant RFCs I can't find any
>> requirement for binding the life time to wall time.
>>
>> A life time of 10 minutes does not change when the wall clock is
>> adjusted for whatever reasons. It's still 10 minutes and not some
>> random result of the wall clock adjustments. But I might be wrong as
>> usual :)
>
> Well we started out with straight timers.  It was changed because
> people wanted IPsec SAs to expire after a suspect/resume which
> AFAIK does not touch normal timers.

I'm not sure I've totally groked the specific need here, but if you're
wanting a monotonic clockbase that includes suspend time, then you
might checkout CLOCK_BOOTTIME.

thanks
-john
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html