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  • [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-17:06.hyperv

    From FreeBSD Errata Notices@21:1/5 to All on Wed Jul 12 16:00:00 2017
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    ============================================================================= FreeBSD-EN-17:06.hyperv Errata Notice
    The FreeBSD Project

    Topic: Boot compatibility improvements with Azure VMs

    Category: core
    Module: hyperv/storvsc
    Announced: 2017-07-12
    Credits: Microsoft OSTC
    Affects: FreeBSD 10.3
    Corrected: 2016-10-19 08:45:19 UTC (stable/10, 10.3-STABLE)
    2017-07-12 08:07:55 UTC (releng/10.3, 10.3-RELEASE-p20)

    For general information regarding FreeBSD Errata Notices and Security Advisories, including descriptions of the fields above, security
    branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>.

    I. Background

    Hyper-V is a default hypervisor provided on Windows server by Microsoft.
    The ATA driver is the legacy storage driver for FreeBSD on Hyperv; now they
    are replaced by a synthetic driver which has better performance.

    There are issues when attaching multiple synthetic storage drivers for
    FreeBSD 10.3 on some of Hyper-V hosts.

    The CD/DVD cannot be detected in some circumstances which causes provisioning fail on Azure.

    II. Problem Description

    The disk INQUIRY response is not complete for FreeBSD 10.3 on some
    Hyper-V hosts, which will cause the disks to be detached during boot.

    An interrupt is missing if we allow intr_shuffle_irqs on Hyper-V.

    III. Impact

    FreeBSD 10.3 can not be boot properly on a guest system on Hyper-V host.

    IV. Workaround

    No workaround is available, however systems not running within Hyper-V or
    Azure are unaffected.

    V. Solution

    Perform one of the following:

    1) Upgrade your system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date.

    A reboot is required.

    2) To update your system via a binary patch:

    Systems running a RELEASE version of FreeBSD on the i386 or amd64
    platforms can be updated via the freebsd-update(8) utility:

    # freebsd-update fetch
    # freebsd-update install

    A reboot is required.

    3) To update your system via a source code patch:

    The following patches have been verified to apply to the applicable
    FreeBSD release branches.

    a) Download the relevant patch from the location below, and verify the
    detached PGP signature using your PGP utility.

    # fetch https://security.FreeBSD.org/patches/EN-17:06/hyperv.patch
    # fetch https://security.FreeBSD.org/patches/EN-17:06/hyperv.patch.asc
    # gpg --verify hyperv.patch.asc

    b) Apply the patch. Execute the following commands as root:

    # cd /usr/src
    # patch < /path/to/patch

    c) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
    system.

    VI. Correction details

    The following list contains the correction revision numbers for each
    affected branch.

    Branch/path Revision
    - ------------------------------------------------------------------------- stable/10/ r307623 releng/10.3/ r320912
    - -------------------------------------------------------------------------

    To see which files were modified by a particular revision, run the
    following command, replacing NNNNNN with the revision number, on a
    machine with Subversion installed:

    # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

    Or visit the following URL, replacing NNNNNN with the revision number:

    <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

    VII. References

    <URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212721>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-17:06.hyperv.asc> -----BEGIN PGP SIGNATURE-----
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