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  • [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-20:18.getfsstat

    From FreeBSD Errata Notices@21:1/5 to All on Wed Sep 2 18:00:02 2020
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    ============================================================================= FreeBSD-EN-20:18.getfsstat Errata Notice
    The FreeBSD Project

    Topic: getfsstat compatibility system call panic

    Category: core
    Module: getfsstat
    Announced: 2020-09-02
    Credits: Rodrigo Rubira Branco (BSDaemon), Amazon Web Services
    Affects: FreeBSD 11.3 and 11.4
    Corrected: 2020-06-20 04:39:52 UTC (stable/11, 11.4-STABLE)
    2020-09-02 16:22:14 UTC (releng/11.4, 11.4-RELEASE-p3)
    2020-09-02 16:22:14 UTC (releng/11.3, 11.3-RELEASE-p13)

    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

    getfsstat(2) is a system call which provides information about mounted filesystems. The kernel provides compatibility system calls for old
    versions of the interface.

    II. Problem Description

    A bug in an internal interface used by getfsstat(2) compatibility system
    calls could result in a free of an uninitialized pointer when getfsstat(2)
    is called with an invalid argument.

    III. Impact

    A kernel panic can be triggered by an unprivileged user process.

    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 an 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-20:18/getfsstat.patch
    # fetch https://security.FreeBSD.org/patches/EN-20:18/getfsstat.patch.asc
    # gpg --verify getfsstat.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/11/ r362426 releng/11.4/ r365254 releng/11.3/ r365254
    - -------------------------------------------------------------------------

    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-20:18.getfsstat.asc> -----BEGIN PGP SIGNATURE-----

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