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  • [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-19:13.mds

    From FreeBSD Errata Notices@21:1/5 to All on Tue Aug 13 05:48:37 2019
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    ============================================================================= FreeBSD-EN-19:13.mds Errata Notice
    The FreeBSD Project

    Topic: Kernel panic from Intel CPU vulnerability mitigation

    Category: core
    Module: kernel
    Announced: 2019-07-24
    Credits: Schuendehuette, Matthias
    All supported versions of FreeBSD.
    Corrected: 2019-07-14 05:40:03 UTC (stable/12, 12.0-STABLE)
    2019-07-24 12:50:46 UTC (releng/12.0, 12.0-RELEASE-p8)
    2019-07-14 05:41:43 UTC (stable/11, 11.2-STABLE)
    2019-07-24 12:50:46 UTC (releng/11.2, 11.2-RELEASE-p12)
    2019-07-24 12:50:46 UTC (releng/11.3, 11.3-RELEASE-p1)

    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

    In a previous update FreeBSD added mitigations for an Intel CPU
    vulnerability known as "microarchitectural data sampling."

    II. Problem Description

    Under certain configurations a pointer to the mitigation routine may be dereferenced before it is initialized.

    III. Impact

    Depending on system configuration, version, and architecture, the system
    may panic early in boot process, and thus be unusable.

    IV. Workaround

    No workaround is available.

    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, and reboot.

    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
    # shutdown -r +10min "Errata update"

    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.

    [FreeBSD 11.2, FreeBSD 11.3]
    # fetch https://security.FreeBSD.org/patches/EN-19:13/mds.11.patch
    # fetch https://security.FreeBSD.org/patches/EN-19:13/mds.11.patch.asc
    # gpg --verify mds.11.patch.asc

    [FreeBSD 12.0]
    # fetch https://security.FreeBSD.org/patches/EN-19:13/mds.12.patch
    # fetch https://security.FreeBSD.org/patches/EN-19:13/mds.12.patch.asc
    # gpg --verify mds.12.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/12/ r349983 releng/12.0/ r350280 stable/11/ r349985 releng/11.2/ r350280 releng/11.3/ r350280
    - -------------------------------------------------------------------------

    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

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-19:13.mds.asc> -----BEGIN PGP SIGNATURE-----

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