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  • FreeBSD Errata Notice FreeBSD-EN-22:17.cam

    From FreeBSD Errata Notices@21:1/5 to All on Tue Aug 9 23:00:13 2022
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    ============================================================================= FreeBSD-EN-22:17.cam Errata Notice
    The FreeBSD Project

    Topic: Kernel memory corruption during SCSI error recovery

    Category: core
    Module: cam
    Announced: 2022-08-09
    Affects: All supported versions of FreeBSD.
    Corrected: 2022-05-03 20:32:45 UTC (stable/13, 13.1-STABLE)
    2022-08-09 20:01:20 UTC (releng/13.1, 13.1-RELEASE-p1)
    2022-08-09 20:00:26 UTC (releng/13.0, 13.0-RELEASE-p12)
    2022-05-04 01:04:43 UTC (stable/12, 12.3-STABLE)
    2022-08-09 19:59:40 UTC (releng/12.3, 12.3-RELEASE-p6)

    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

    CAM (Common Access Method) is a FreeBSD kernel subsystem which handles
    various aspects of storage device management. Among other
    responsibilities, it handles device error recovery and can automatically retransmit commands to peripheral devices when a transient error is encountered.

    II. Problem Description

    When a CAM-managed device responds to a command with an error condition,
    CAM may automatically retry the command following some error recovery
    protocol. For instance, it may send a SCSI START UNIT command to the
    device before retrying the failed command. In this case, an in-memory
    copy of the original command is preserved for a later retry. However,
    a specific portion of the command state was not saved correctly, and
    upon a retry this could lead to memory corruption.

    III. Impact

    The bug can cause kernel panics or other system-level misbehaviour.

    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 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-22:17/cam.patch
    # fetch https://security.FreeBSD.org/patches/EN-22:17/cam.patch.asc
    # gpg --verify cam.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/ 84849cfd1dc0 stable/13-n250673 releng/13.1/ db8082886fd8 releng/13.1-n250149 releng/13.0/ 5430423b6d63 releng/13.0-n244803 stable/12/ r372069 releng/12.3/ r372378
    - -------------------------------------------------------------------------

    For FreeBSD 13 and later:

    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

    For FreeBSD 12 and earlier:

    Run the following command to see which files were modified by a particular revision, replacing NNNNNN with the revision number:

    # 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=262894>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-22:17.cam.asc> -----BEGIN PGP SIGNATURE-----

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