• [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-21:15.virtio

    From FreeBSD Errata Notices@21:1/5 to All on Thu May 27 02:00:01 2021
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    ============================================================================= FreeBSD-EN-21:15.virtio Errata Notice
    The FreeBSD Project

    Topic: virtio(4) device probing fails

    Category: core
    Module: virtio
    Announced: 2021-05-26
    Affects: FreeBSD 13.0
    Corrected: 2021-04-03 06:09:50 UTC (stable/13, 13.0-STABLE)
    2021-05-26 20:32:40 UTC (releng/13.0, 13.0-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

    VirtIO is a specification for para-virtualized I/O in a virtual machine
    (VM). It defines an interface for efficient I/O between the hypervisor
    and VM.

    II. Problem Description

    The virtio(4) driver on FreeBSD implemented support of the legacy
    interface, which was released before the specification was formalized, requiring certain characteristics that were different on some VMM implementations.

    III. Impact

    FreeBSD will not boot on certain VMM implementations.

    IV. Workaround

    No workaround is available.

    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 amd64, i386, or
    (on FreeBSD 13 and later) arm64 platforms can be updated via the freebsd-update(8) utility:

    # freebsd-update fetch
    # freebsd-update install
    # shutdown -r +10min "Rebooting for an erratum 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-21:15/virtio.patch
    # fetch https://security.FreeBSD.org/patches/EN-21:15/virtio.patch.asc
    # gpg --verify virtio.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

    This issue is corrected by the corresponding Git commit hash or Subversion revision number in the following stable and release branches:

    Branch/path Hash Revision
    - ------------------------------------------------------------------------- stable/13/ 2e107638eac2 stable/13-n245094 releng/13.0/ 61acb3179a90 releng/13.0-n244741
    - -------------------------------------------------------------------------

    Run the following command to see which files were modified by a
    particular commit:

    # git show --stat <commit hash>

    Or visit the following URL, replacing NNNNNN with the hash:

    <URL:https://cgit.freebsd.org/src/commit/?id=NNNNNN>

    To determine the commit count in a working tree (for comparison against
    nNNNNNN in the table above), run:

    # git rev-list --count --first-parent HEAD

    VII. References

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-21:15.virtio.asc> -----BEGIN PGP SIGNATURE-----

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