Re: [Ntp] [Technical Errata Reported] RFC5905 (6550)

Harlan Stenn <stenn@nwtime.org> Mon, 19 April 2021 04:39 UTC

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To: Erik Kline <ek.ietf@gmail.com>, NTP WG <ntp@ietf.org>
Cc: "Eric Vyncke (evyncke)" <evyncke@cisco.com>, Dieter Sibold <dsibold.ietf@gmail.com>, isomer@gmail.com, Karen O'Donoghue <odonoghue@isoc.org>
References: <20210417113938.5909CF407D4@rfc-editor.org> <CAMGpriXz_zFgUwg2i9eYwwrMYyeurMz8ST93JcnA=fD=YeiXGQ@mail.gmail.com>
From: Harlan Stenn <stenn@nwtime.org>
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Date: Sun, 18 Apr 2021 21:39:05 -0700
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Subject: Re: [Ntp] [Technical Errata Reported] RFC5905 (6550)
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FWIW, no objection here.

On 4/18/2021 9:26 PM, Erik Kline wrote:
> All,
> 
> Any objection to me marking this as "verified" (or, since it's in
> appendix code, an argument for "held for document update" might be made,
> I suppose).
> 
> Thanks,
> -ek
> 
> On Sat, Apr 17, 2021 at 4:39 AM RFC Errata System
> <rfc-editor@rfc-editor.org <mailto:rfc-editor@rfc-editor.org>> wrote:
> 
>     The following errata report has been submitted for RFC5905,
>     "Network Time Protocol Version 4: Protocol and Algorithms
>     Specification".
> 
>     --------------------------------------
>     You may review the report below and at:
>     https://www.rfc-editor.org/errata/eid6550
> 
>     --------------------------------------
>     Type: Technical
>     Reported by: Perry Lorier <isomer@gmail.com <mailto:isomer@gmail.com>>
> 
>     Section: A.5.2
> 
>     Original Text
>     -------------
>             for (i = 0; i < NSTAGE; i++) {
>                     p->disp += f[i].disp / (2 ^ (i + 1));
>                     p->jitter += SQUARE(f[i].offset - f[0].offset);
>             }
> 
>     Corrected Text
>     --------------
>             for (i = 0; i < NSTAGE; i++) {
>                     p->disp += f[i].disp / (1 << (i + 1));
>                     p->jitter += SQUARE(f[i].offset - f[0].offset);
>             }
> 
>     Notes
>     -----
>     ^ is the xor operator in C, not the exponent operator.  2 xor (i+1)
>     will be zero when i == 1, causing a division by zero error.
> 
>     Instructions:
>     -------------
>     This erratum is currently posted as "Reported". If necessary, please
>     use "Reply All" to discuss whether it should be verified or
>     rejected. When a decision is reached, the verifying party 
>     can log in to change the status and edit the report, if necessary.
> 
>     --------------------------------------
>     RFC5905 (draft-ietf-ntp-ntpv4-proto-13)
>     --------------------------------------
>     Title               : Network Time Protocol Version 4: Protocol and
>     Algorithms Specification
>     Publication Date    : June 2010
>     Author(s)           : D. Mills, J. Martin, Ed., J. Burbank, W. Kasch
>     Category            : PROPOSED STANDARD
>     Source              : Network Time Protocol
>     Area                : Internet
>     Stream              : IETF
>     Verifying Party     : IESG
> 
> 
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> 

-- 
Harlan Stenn <stenn@nwtime.org>
http://networktimefoundation.org - be a member!