• [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-20:14.linuxkpi

    From FreeBSD Errata Notices@21:1/5 to All on Wed Jul 8 22:00:01 2020
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    ============================================================================= FreeBSD-EN-20:14.linuxkpi Errata Notice
    The FreeBSD Project

    Topic: Kernel panic in LinuxKPI subsystem

    Category: core
    Module: linuxkpi
    Announced: 2020-07-08
    Affects: FreeBSD 12.1 and 11.3
    Corrected: 2020-01-22 00:30:27 UTC (stable/12, 12.1-STABLE)
    2020-07-08 19:57:24 UTC (releng/12.1, 12.1-RELEASE-p7)
    2020-01-22 15:51:24 UTC (stable/11, 11.3-STABLE)
    2020-07-08 19:57:24 UTC (releng/11.3, 11.3-RELEASE-p11)

    Note: FreeBSD 11.4 was branched after the original commit to the stable/11 branch and already includes this erratum.

    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

    The LinuxKPI subsystem allows kernel code ported from Linux to run in the FreeBSD kernel without extensive modification. Some graphics drivers make
    use of this subsystem.

    II. Problem Description

    A bug in one of the LinuxKPI subroutines could cause a kernel panic.

    III. Impact

    Certain graphical applications may trigger a kernel panic. This is most
    often observed when using X11 forwarding to run an application remotely.

    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 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-20:14/linuxpki.patch
    # fetch https://security.FreeBSD.org/patches/EN-20:14/linuxpki.patch.asc
    # gpg --verify linuxkpi.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/ r356953 releng/12.1/ r363023 stable/11/ r356987 releng/11.3/ r363023
    - -------------------------------------------------------------------------

    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

    <other info on the problem>

    <URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242913>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:14.linuxkpi.asc> -----BEGIN PGP SIGNATURE-----

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