linux-kernel - Re: [Y2038] [PATCH 7/8] ppdev: fix PPGETTIME/PPSETTIME ioctls

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Message-ID: <CAK8P3a3vEBepxkP-UmcpHHqrpq2m3woxyxVf2DSL125UYb9Ktg@mail.gmail.com>
Date:   Thu, 21 Nov 2019 15:06:39 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Ben Hutchings <ben.hutchings@...ethink.co.uk>
Cc:     y2038 Mailman List <y2038@...ts.linaro.org>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "# 3.4.x" <stable@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>
Subject: Re: [Y2038] [PATCH 7/8] ppdev: fix PPGETTIME/PPSETTIME ioctls

On Wed, Nov 20, 2019 at 8:29 PM Ben Hutchings
<ben.hutchings@...ethink.co.uk> wrote:
>
> On Fri, 2019-11-08 at 21:34 +0100, Arnd Bergmann wrote:
> > Going through the uses of timeval in the user space API,
> > I noticed two bugs in ppdev that were introduced in the y2038
> > conversion:
> >
> > * The range check was accidentally moved from ppsettime to
> >   ppgettime
> >
> > * On sparc64, the microseconds are in the other half of the
> >   64-bit word.
> >
> > Fix both, and mark the fix for stable backports.
>
> Like the patch for lpdev, this also doesn't completely fix sparc64.

I think the same applies as in the other patch:

- it actually works correctly because of the alignment
- it's already merged in linux-next
- if you wish, I can add another cleanup patch on top, but I'd
  prefer to just leave it as it is.

      Arnd