132 lines
5 KiB
Text
132 lines
5 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-EN-20:17.linuxthread Errata Notice
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The FreeBSD Project
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Topic: FreeBSD Linux ABI kernel panic
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Category: core
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Module: kernel
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Announced: 2020-09-02
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Credits: Martin Filla
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Henrique L. Amorim, Independent Security Researcher
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Rodrigo Rubira Branco (BSDaemon), Amazon Web Services
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Affects: All supported versions of FreeBSD.
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Corrected: 2020-06-25 05:24:35 UTC (stable/12, 12.1-STABLE)
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2020-09-02 16:21:27 UTC (releng/12.1, 12.1-RELEASE-p9)
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2020-06-25 05:35:46 UTC (stable/11, 11.4-STABLE)
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2020-09-02 16:21:27 UTC (releng/11.4, 11.4-RELEASE-p3)
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2020-09-02 16:21:27 UTC (releng/11.3, 11.3-RELEASE-p13)
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For general information regarding FreeBSD Errata Notices and Security
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Advisories, including descriptions of the fields above, security
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branches, and the following sections, please visit
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<URL:https://security.FreeBSD.org/>.
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I. Background
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The Linux ABI layer (Linuxulator) allows Linux binaries to be executed on a
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FreeBSD kernel.
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II. Problem Description
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The kernel function handling exec(3) of a Linux binary did not correctly
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handle a calling process with multiple threads.
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III. Impact
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A multithread non-Linux process execing a Linux binary would fail a kernel
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assertion, resuting in a kernel panic "thread_detach: emuldata not found."
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IV. Workaround
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No workaround is available. Systems not using the Linux ABI layer are not
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affected.
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V. Solution
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Upgrade your system to a supported FreeBSD stable or release / security
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branch (releng) dated after the correction date, and reboot.
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Perform one of the following:
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1) To update your system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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# shutdown -r +10min "Rebooting for an errata update"
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2) To update your system via a source code patch:
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The following patches have been verified to apply to the applicable
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FreeBSD release branches.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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# fetch https://security.FreeBSD.org/patches/EN-20:17/linuxthread.patch
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# fetch https://security.FreeBSD.org/patches/EN-20:17/linuxthread.patch.asc
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# gpg --verify linuxthread.patch.asc
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b) Apply the patch. Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile your kernel as described in
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<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
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system.
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/12/ r362605
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releng/12.1/ r365253
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stable/11/ r362606
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releng/11.4/ r365253
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releng/11.3/ r365253
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing NNNNNN with the revision number, on a
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machine with Subversion installed:
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# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing NNNNNN with the revision number:
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<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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<URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247020>
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The latest revision of this advisory is available at
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<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:17.linuxthread.asc>
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