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  • [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-20:16.vmx

    From FreeBSD Errata Notices@21:1/5 to All on Wed Aug 5 18:00:00 2020
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    ============================================================================= FreeBSD-EN-20:16.vmx Errata Notice
    The FreeBSD Project

    Topic: vmx driver packet loss and degraded performance

    Category: core
    Module: vmx
    Announced: 2020-08-05
    Affects: FreeBSD 12.1
    Corrected: 2020-01-20 22:15:33 UTC (stable/12, 12.1-STABLE)
    2020-08-05 17:09:54 UTC (releng/12.1, 12.1-RELEASE-p8)

    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

    vmx(4) is a driver for the virtualized network interface device used by
    VMware. It implements TCP segmentation offload (TSO), a performance
    feature which allows the device to perform TCP segmentation immediately
    prior to packet transmission, reducing the amount of work required of
    the kernel's TCP implementation.

    II. Problem Description

    vmx(4) in FreeBSD 12.1 contains a bug which causes the driver to set up transmit descriptors incorrectly when performing TSO.

    III. Impact

    With TSO enabled in vmx(4) interfaces, TCP sessions may hang or
    experience degraded performance due to packet loss.

    IV. Workaround

    Using ifconfig(8), TSO can be disabled on vmx(4) interfaces by
    specifying "-tso".

    V. Solution

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

    Perform one of the following:

    1) 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 "Rebooting for errata update"

    2) 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-20:16/vmx.patch
    # fetch https://security.FreeBSD.org/patches/EN-20:16/vmx.patch.asc
    # gpg --verify vmx.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/ r356932 releng/12.1/ r363920
    - -------------------------------------------------------------------------

    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=236999>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:16.vmx.asc> -----BEGIN PGP SIGNATURE-----

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