Re: [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-18:08.lazyfpu

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Re: [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-18:08.lazyfpu

Dave Cottlehuber-2
On Fri, 14 Sep 2018, at 09:39, Dave Cottlehuber wrote:

> On Wed, 12 Sep 2018, at 07:43, FreeBSD Errata Notices wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA512
> >
> > =============================================================================
> > FreeBSD-EN-18:08.lazyfpu                                        Errata Notice
> >                                                           The FreeBSD Project
> >
> > Topic:          LazyFPU remediation causes potential data corruption
>
> Data Corruption reads a bit like "Imminent SuperNova in Your Area".. I'm
> not really sure what it means for users & sysadmins. Given we've had the
> original lazyfpu patches out for 11.x for a few months[1]:
>
> - what might data corruption entail?
> - has this been observed in the wild?
>
> Many thanks for the efforts into making these patches available.
> Dave
>
> [1]: https://www.freebsd.org/security/advisories/FreeBSD-SA-18:07.lazyfpu.asc

Hi secteam, can you shed any light on the above?

Thanks
Dave
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Re: [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-18:08.lazyfpu

Konstantin Belousov
On Mon, Oct 08, 2018 at 11:21:11AM +0200, Dave Cottlehuber wrote:

> On Fri, 14 Sep 2018, at 09:39, Dave Cottlehuber wrote:
> > On Wed, 12 Sep 2018, at 07:43, FreeBSD Errata Notices wrote:
> > > -----BEGIN PGP SIGNED MESSAGE-----
> > > Hash: SHA512
> > >
> > > =============================================================================
> > > FreeBSD-EN-18:08.lazyfpu                                        Errata Notice
> > >                                                           The FreeBSD Project
> > >
> > > Topic:          LazyFPU remediation causes potential data corruption
> >
> > Data Corruption reads a bit like "Imminent SuperNova in Your Area".. I'm
> > not really sure what it means for users & sysadmins. Given we've had the
> > original lazyfpu patches out for 11.x for a few months[1]:
> >
> > - what might data corruption entail?
The FPU registers can be corrupted.  This was observed so far only on the
in-kernel FPU consumer, i.e. aesni.ko.


> > - has this been observed in the wild?
Yes, see above.

> >
> > Many thanks for the efforts into making these patches available.
> > Dave
> >
> > [1]: https://www.freebsd.org/security/advisories/FreeBSD-SA-18:07.lazyfpu.asc
>
> Hi secteam, can you shed any light on the above?
>
> Thanks
> Dave
> _______________________________________________
> [hidden email] mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-security
> To unsubscribe, send any mail to "[hidden email]"
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