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============================================================================= FreeBSD-EN-17:08.pf Errata Notice
The FreeBSD Project
Topic: pf(4) housekeeping thread causes kernel panic
Category: core
Module: pf
Announced: 2017-08-10
Credits: Kristof Provost, VinÃcius Zavam, Paul Herman
Affects: FreeBSD 11.x
Corrected: 2017-07-20 17:15:18 UTC (stable/11, 11.1-STABLE)
2017-08-10 06:59:07 UTC (releng/11.1, 11.1-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
pf(4) is one of several packet filter available in FreeBSD, originally
written for OpenBSD. In addition to filtering packets, it also has packet normalization capabilities.
II. Problem Description
A pf housekeeping thread (pf_purge_thread) could potentially use an uninitialized variable, leading to a division by zero and a kernel panic.
III. Impact
Affected systems panic during startup.
IV. Workaround
No workaround is available, but systems not loading the pf kernel module are not affected. Once a system has started successfully it will not be at risk
of this problem until it is restarted.
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.
Afterward, reboot the system.
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
Afterward, reboot the system.
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.
# fetch
https://security.FreeBSD.org/patches/EN-17:08/pf.patch
# fetch
https://security.FreeBSD.org/patches/EN-17:08/pf.patch.asc
# gpg --verify pf.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/11/ r321296 releng/11.1/ r322342
- -------------------------------------------------------------------------
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=220830>
The latest revision of this advisory is available at <URL:
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