• FreeBSD Errata Notice FreeBSD-EN-22:13.zfs

    From FreeBSD Errata Notices@21:1/5 to All on Mon Mar 21 20:00:04 2022
    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA512

    ============================================================================= FreeBSD-EN-22:13.zfs Errata Notice
    The FreeBSD Project

    Topic: ZFS data loss

    Category: contrib
    Module: zfs
    Announced: 2022-03-21
    Affects: FreeBSD 13.0-p8
    Corrected: 2022-03-20 14:10:36 UTC (releng/13.0, 13.0-RELEASE-p9)

    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

    ZFS is one of several filesystems available on FreeBSD. ZFS supports
    many advanced features, including checksumming, transparent compression,
    and snapshots.

    II. Problem Description

    Erratum FreeBSD-EN-22:11.zfs was addressed by a patch which modified a
    ZFS kernel function that determines whether the in-memory copy of a
    filesystem object is dirty with respect to its representation on stable storage. The modification contained a bug which could cause the
    function to return false negatives.

    III. Impact

    Under heavy load, files written to a ZFS filesystem may not be correctly
    saved to disk.

    IV. Workaround

    No workaround is available, but systems not using ZFS are not affected.

    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 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-22:13/zfs.patch
    # fetch https://security.FreeBSD.org/patches/EN-22:13/zfs.patch.asc
    # gpg --verify zfs.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
    - ------------------------------------------------------------------------- releng/13.0/ b8ae329db949 releng/13.0-n244788
    - -------------------------------------------------------------------------

    For FreeBSD 13 and later:

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

    # git show --stat NNNNNNNNNNNN

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

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

    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-22:13.zfs.asc> -----BEGIN PGP SIGNATURE-----

    iQIzBAEBCgAdFiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAmI4zUQACgkQ05eS9J6n 5cJN8w//cVuY7dgMFIFsxLdMUfWQevqhWKHgT3itBo+WCYgpDixBHGvXrduYbFGO gBB4Q9qlTKnNqVVR3AQvzmc7t2quJcjI+p6Sfq1UlmjyEEYmsSQndYOSUGeR0zli P8UgjMx9VDXyugZWy/jGDBIXr3tKYXdeTlfSwJ0Dxkf3k0NpOCPvvpZSCAQlrCXd dwI25I39fGOZKES8rW6TPcN8K2uSvlHu4i2v3MYfPHkRVOwdbMA33YaX/bCvTwHa h8hg2hnwLNGUWhQZ6cwW/kPBjp7yVuDc0VIqfCyA7DqgUbo6juYm7ZD+EHUaVfAV 32FFrMY/crH6UoZ1LXYK7I/xmyec5o66VewoGYsiY+5bFb0jNC8Pv/fmtzFPOFGW rHPxsLP/2rFpqwoNnhTX9wohqxHLOoN/DtjcTzznlL+VutOdQqNuU+U9o8wG5tea e+8tfNbvxSV2qvEZ/gqliSkpICe70jM04/ZkBw+eFdFqRZdV/tIIfEonzutqCi3x h/9r335b+6gJvpEkyq1VHesuydY5K21aPPnyETEOGKQAGfPMNyB67LNSd29gATHi CjJDkylMhMMf/qaTBxViMYSEZ3mzkbTkIQE9Oph2M2YMbZoh8VwNfu0mU6kxBBfT kSeGF1QZjnHeHWeRpd/lsKxFbNfElwVeoQc8e9evYHqNEdeyle8=
    =085i
    -----END PGP SIGNATURE-----

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)