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  • [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-17:07.vnet

    From FreeBSD Errata Notices@21:1/5 to All on Thu Aug 10 08:00:00 2017
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    ============================================================================= FreeBSD-EN-17:07.vnet Errata Notice
    The FreeBSD Project

    Topic: VNET kernel panic with asynchronous I/O

    Category: core
    Module: kernel
    Announced: 2017-08-10
    Credits: Kristof Provost
    Affects: FreeBSD 11.0 and later.
    Corrected: 2017-07-28 18:09:41 UTC (stable/11, 11.1-STABLE)
    2017-08-10 06:59:07 UTC (releng/11.1, 11.1-RELEASE-p1)
    2017-08-10 06:59:26 UTC (releng/11.0, 11.0-RELEASE-p12)

    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

    POSIX asynchronous I/O permits applications to request asynchronous
    completion of I/O requests. VNET permits systems to be configured
    with multiple instances of the in-kernel network stack.

    II. Problem Description

    The implementation of POSIX asynchronous I/O for sockets completes I/O
    requests in a pool of dedicated worker threads. The VNET feature requires threads to explicitly select an active instance of the network stack before performing network operations. The function used to complete asynchronous
    I/O requests was not setting a network stack instance before completing I/O requests.

    III. Impact

    Using POSIX asynchronous I/O with sockets in a VNET-enabled kernel will
    panic.

    IV. Workaround

    No workaround is available, but systems that do not enable VNET via a
    custom kernel are not affected.

    V. Solution

    Perform one of the following:

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

    Afterward, reboot the system.

    2) 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

    Recompile any custom kernel configs using VNET.

    Afterward, reboot the system.

    3) 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-17:07/vnet.patch
    # fetch https://security.FreeBSD.org/patches/EN-17:07/vnet.patch.asc
    # gpg --verify vnet.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/ r321657 releng/11.0/ r322343 releng/11.1/ r322342
    - -------------------------------------------------------------------------

    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-17:07.vnet.asc> -----BEGIN PGP SIGNATURE-----
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