Date: Wed, 2 Sep 2020 17:45:24 +0000 (UTC) From: FreeBSD Errata Notices <errata-notices@freebsd.org> To: FreeBSD Errata Notices <errata-notices@freebsd.org> Subject: [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-20:17.linuxthread Message-ID: <20200902174524.F3AEEC921@freefall.freebsd.org>
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FreeBSD-EN-20:17.linuxthread Errata Notice
The FreeBSD Project
Topic: FreeBSD Linux ABI kernel panic
Category: core
Module: kernel
Announced: 2020-09-02
Credits: Martin Filla
Henrique L. Amorim, Independent Security Researcher
Rodrigo Rubira Branco (BSDaemon), Amazon Web Services
Affects: All supported versions of FreeBSD.
Corrected: 2020-06-25 05:24:35 UTC (stable/12, 12.1-STABLE)
2020-09-02 16:21:27 UTC (releng/12.1, 12.1-RELEASE-p9)
2020-06-25 05:35:46 UTC (stable/11, 11.4-STABLE)
2020-09-02 16:21:27 UTC (releng/11.4, 11.4-RELEASE-p3)
2020-09-02 16:21:27 UTC (releng/11.3, 11.3-RELEASE-p13)
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
The Linux ABI layer (Linuxulator) allows Linux binaries to be executed on a
FreeBSD kernel.
II. Problem Description
The kernel function handling exec(3) of a Linux binary did not correctly
handle a calling process with multiple threads.
III. Impact
A multithread non-Linux process execing a Linux binary would fail a kernel
assertion, resuting in a kernel panic "thread_detach: emuldata not found."
IV. Workaround
No workaround is available. Systems not using the Linux ABI layer 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 i386 or amd64
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-20:17/linuxthread.patch
# fetch https://security.FreeBSD.org/patches/EN-20:17/linuxthread.patch.asc
# gpg --verify linuxthread.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/ r362605
releng/12.1/ r365253
stable/11/ r362606
releng/11.4/ r365253
releng/11.3/ r365253
- -------------------------------------------------------------------------
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=247020>;
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:17.linuxthread.asc>;
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