Re: [RFC PATCH 4/4] X.509: Handle midnight alternative notation in GeneralizedTime

From: One Thousand Gnomes
Date: Wed Jan 20 2016 - 10:31:06 EST

On Wed, 20 Jan 2016 15:20:00 +0000
David Howells <dhowells@xxxxxxxxxx> wrote:

> Rudolf Polzer <rpolzer@xxxxxxxxxx> wrote:
> > As for 24:xx:yy times - I'm split about this. This code doesn't
> > require a bijective decoding anyway (and if it did, 24:00:00 and
> > 00:00:00 mapping to the same time64_t would be problem enough) so this
> > is sure safe. On the other hand, a cert with a 24:xx:yy time that's
> > not 24:00:00 probably should be regarded as invalid and not trusted
> > for that reason alone.
> Feel free to argue that one with Linus:-/

Pedantic hat on 24:00:01 is also potentially valid. The ANSI and ISO
standards allow for double leap seconds even though CCIR-460 doesn't
allow it to actually happen.