• [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-20:15.mps

    From FreeBSD Errata Notices@21:1/5 to All on Wed Jul 8 22:00:01 2020
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    ============================================================================= FreeBSD-EN-20:15.mps Errata Notice
    The FreeBSD Project

    Topic: Kernel panic in mps(4) driver

    Category: core
    Module: mps
    Announced: 2020-07-08
    Affects: All supported version of FreeBSD.
    Corrected: 2020-06-11 14:48:20 UTC (stable/12, 12.1-STABLE)
    2020-07-08 19:58:00 UTC (releng/12.1, 12.1-RELEASE-p7)
    2020-06-11 14:49:38 UTC (stable/11, 11.4-STABLE)
    2020-07-08 19:58:00 UTC (releng/11.4, 11.4-RELEASE-p1)
    2020-07-08 19:58:00 UTC (releng/11.3, 11.3-RELEASE-p11)

    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

    mps(4) is a disk controller driver. It exports an ioctl(2) interface used by several command-line utilities to query for or set properties of the device.

    II. Problem Description

    mps(4) implements a pass-through interface which allows privileged user processes to submit commands directly to disks behind the controller. A bug
    in the code which copies command results out to the requesting process could cause a kernel panic.

    III. Impact

    Administrative commands issued by, e.g., sas2ircu, could cause a kernel panic.

    IV. Workaround

    No workaround is available. Systems that do not use mps(4) are unaffected.

    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-20:15/mps.patch
    # fetch https://security.FreeBSD.org/patches/EN-20:15/mps.patch.asc
    # gpg --verify mps.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/ r362057 releng/12.1/ r363024 stable/11/ r362058 releng/11.4/ r363024 releng/11.3/ r363024
    - -------------------------------------------------------------------------

    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=223813>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:15.mps.asc> -----BEGIN PGP SIGNATURE-----

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