FreeBSD Errata Notice FreeBSD-EN-20:16.vmx
5 August, 2020 by errata-notices@freebsd.org | freebsd
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
=============================================================================
FreeBSD-EN-20:16.vmx Errata Notice
The FreeBSD Project
Topic: vmx driver packet loss and degraded performance
Category: core
Module: vmx
Announced: 2020-08-05
Affects: FreeBSD 12.1
Corrected: 2020-01-20 22:15:33 UTC (stable/12, 12.1-STABLE)
2020-08-05 17:09:54 UTC (releng/12.1, 12.1-RELEASE-p8)
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
vmx(4) is a driver for the virtualized network interface device used by
VMware. It implements TCP segmentation offload (TSO), a performance
feature which allows the device to perform TCP segmentation immediately
prior to packet transmission, reducing the amount of work required of
the kernel's TCP implementation.
II. Problem Description
vmx(4) in FreeBSD 12.1 contains a bug which causes the driver to set up
transmit descriptors incorrectly when performing TSO.
III. Impact
With TSO enabled in vmx(4) interfaces, TCP sessions may hang or
experience degraded performance due to packet loss.
IV. Workaround
Using ifconfig(8), TSO can be disabled on vmx(4) interfaces by
specifying "-tso".
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-20:16/vmx.patch
# fetch https://security.FreeBSD.org/patches/EN-20:16/vmx.patch.asc
# gpg --verify vmx.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/ r356932
releng/12.1/ r363920
- -------------------------------------------------------------------------
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#6999>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:16.vmx.asc>
-----BEGIN PGP SIGNATURE-----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/2NI
-----END PGP SIGNATURE-----
_______________________________________________
freebsd-announce@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-announce
To unsubscribe, send any mail to "freebsd-announce-unsubscribe@freebsd.org"