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  • FreeBSD Errata Notice FreeBSD-EN-22:11.zfs

    From FreeBSD Errata Notices@21:1/5 to All on Tue Mar 15 20:00:06 2022
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    ============================================================================= FreeBSD-EN-22:11.zfs Errata Notice
    The FreeBSD Project

    Topic: ZFS lseek(2) inconsistencies

    Category: contrib
    Module: zfs
    Announced: 2022-03-15
    Affects: FreeBSD 13.0
    Corrected: 2021-12-19 15:25:26 UTC (stable/13, 13.0-STABLE)
    2022-03-15 18:09:52 UTC (releng/13.0, 13.0-RELEASE-p8)

    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.

    File "holes" are used by filesystems to limit the amount of storage
    space occupied by a file containing long runs of zero bytes. Rather
    than filling disk blocks with zeroes, file metadata can indicate the
    extent of such a run and the filesystem hides the distinction from user applications.

    II. Problem Description

    When a file containing holes is mapped using mmap(2), mapped regions
    of the file may be ignored by lseek(2) when SEEK_HOLE or SEEK_DATA are
    passed as the "whence" parameter.

    III. Impact

    The bug may cause application misbehavior; the precise effects depend
    on the nature of the application triggering the bug.

    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-22:11/zfs.patch
    # fetch https://security.FreeBSD.org/patches/EN-22:11/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
    - ------------------------------------------------------------------------- stable/13/ 3aa1cabca37d stable/13-n248633 releng/13.0/ f5be20afc356 releng/13.0-n244785
    - -------------------------------------------------------------------------

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

    # git show --stat <commit hash>

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

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

    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

    <URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256205>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-22:11.zfs.asc> -----BEGIN PGP SIGNATURE-----

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