From: Miroslav Lichvar <mlichvar@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>,
linux-kernel@vger.kernel.org, y2038@lists.linaro.org,
John Stultz <john.stultz@linaro.org>,
Prarit Bhargava <prarit@redhat.com>,
Richard Cochran <richardcochran@gmail.com>
Subject: Re: [PATCH] timekeeping: Limit system time to prevent 32-bit time_t overflow
Date: Fri, 9 Oct 2015 12:47:12 +0200 [thread overview]
Message-ID: <20151009104712.GD2166@localhost> (raw)
In-Reply-To: <alpine.DEB.2.11.1510091238071.6097@nanos>
On Fri, Oct 09, 2015 at 12:38:32PM +0200, Thomas Gleixner wrote:
> On Fri, 9 Oct 2015, Miroslav Lichvar wrote:
> > Do you feel the same about preventing the time from reaching
> > KTIME_MAX?
>
> That's going to happen in ~500 years from now.
At any time if you include accidents and attacks on services with
the CAP_SYS_TIME capability (e.g. NTP/PTP implementations). Even with
32-bit time_t you are not safe, the time can be set forward by any
amount with multiple adjtimex(ADJ_SETOFFSET) calls.
--
Miroslav Lichvar
prev parent reply other threads:[~2015-10-09 10:47 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-07 13:22 [PATCH] timekeeping: Limit system time to prevent 32-bit time_t overflow Miroslav Lichvar
2015-10-07 13:47 ` Arnd Bergmann
2015-10-07 14:23 ` Miroslav Lichvar
2015-10-07 15:10 ` Arnd Bergmann
2015-10-08 6:23 ` Miroslav Lichvar
2015-10-08 8:52 ` Arnd Bergmann
2015-10-08 9:39 ` Miroslav Lichvar
2015-10-09 9:46 ` Thomas Gleixner
2015-10-09 10:34 ` Miroslav Lichvar
2015-10-09 10:38 ` Thomas Gleixner
2015-10-09 10:47 ` Miroslav Lichvar [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20151009104712.GD2166@localhost \
--to=mlichvar@redhat.com \
--cc=arnd@arndb.de \
--cc=john.stultz@linaro.org \
--cc=linux-kernel@vger.kernel.org \
--cc=prarit@redhat.com \
--cc=richardcochran@gmail.com \
--cc=tglx@linutronix.de \
--cc=y2038@lists.linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox