FreeBSD Errata Notices
2019-Jul-24 13:49 UTC
[FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-19:13.mds
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============================================================================FreeBSD-EN-19:13.mds
Errata Notice
The FreeBSD Project
Topic: Kernel panic from Intel CPU vulnerability mitigation
Category: core
Module: kernel
Announced: 2019-07-24
Credits: Schuendehuette, Matthias
All supported versions of FreeBSD.
Corrected: 2019-07-14 05:40:03 UTC (stable/12, 12.0-STABLE)
2019-07-24 12:50:46 UTC (releng/12.0, 12.0-RELEASE-p8)
2019-07-14 05:41:43 UTC (stable/11, 11.2-STABLE)
2019-07-24 12:50:46 UTC (releng/11.2, 11.2-RELEASE-p12)
2019-07-24 12:50:46 UTC (releng/11.3, 11.3-RELEASE-p1)
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
In a previous update FreeBSD added mitigations for an Intel CPU
vulnerability known as "microarchitectural data sampling."
II. Problem Description
Under certain configurations a pointer to the mitigation routine may be
dereferenced before it is initialized.
III. Impact
Depending on system configuration, version, and architecture, the system
may panic early in boot process, and thus be unusable.
IV. Workaround
No workaround is available.
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, and reboot.
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
# shutdown -r +10min "Errata update"
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.
[FreeBSD 11.2, FreeBSD 11.3]
# fetch https://security.FreeBSD.org/patches/EN-19:13/mds.11.patch
# fetch https://security.FreeBSD.org/patches/EN-19:13/mds.11.patch.asc
# gpg --verify mds.11.patch.asc
[FreeBSD 12.0]
# fetch https://security.FreeBSD.org/patches/EN-19:13/mds.12.patch
# fetch https://security.FreeBSD.org/patches/EN-19:13/mds.12.patch.asc
# gpg --verify mds.12.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/ r349983
releng/12.0/ r350280
stable/11/ r349985
releng/11.2/ r350280
releng/11.3/ r350280
- -------------------------------------------------------------------------
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-19:13.mds.asc>
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