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FreeBSD-EN-20:15.mps                                            Errata Notice
                                                          The FreeBSD Project

Topic:          Kernel panic in mps(4) driver

Category:       core
Module:         mps
Announced:      2020-07-08
Affects:        All supported version of FreeBSD.
Corrected:      2020-06-11 14:48:20 UTC (stable/12, 12.1-STABLE)
                2020-07-08 19:58:00 UTC (releng/12.1, 12.1-RELEASE-p7)
                2020-06-11 14:49:38 UTC (stable/11, 11.4-STABLE)
                2020-07-08 19:58:00 UTC (releng/11.4, 11.4-RELEASE-p1)
                2020-07-08 19:58:00 UTC (releng/11.3, 11.3-RELEASE-p11)

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

mps(4) is a disk controller driver.  It exports an ioctl(2) interface used by
several command-line utilities to query for or set properties of the device.

II.  Problem Description

mps(4) implements a pass-through interface which allows privileged user
processes to submit commands directly to disks behind the controller.  A bug
in the code which copies command results out to the requesting process could
cause a kernel panic.

III. Impact

Administrative commands issued by, e.g., sas2ircu, could cause a kernel panic.

IV.  Workaround

No workaround is available.  Systems that do not use mps(4) are unaffected.

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 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-20:15/mps.patch
# fetch https://security.FreeBSD.org/patches/EN-20:15/mps.patch.asc
# gpg --verify mps.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/12/                                                        r362057
releng/12.1/                                                      r363024
stable/11/                                                        r362058
releng/11.4/                                                      r363024
releng/11.3/                                                      r363024
- -------------------------------------------------------------------------

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

<URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223813>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:15.mps.asc>
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