FreeBSD Errata Notice FreeBSD-EN-23:10.pci
6 September, 2023 by errata-notices@freebsd.org | freebsd
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
=============================================================================
FreeBSD-EN-23:10.pci Errata Notice
The FreeBSD Project
Topic: PCI-e hot-plug is broken with certain devices
Category: core
Module: pci
Announced: 2023-09-06
Affects: FreeBSD 13.2
Corrected: 2023-06-28 01:32:47 UTC (stable/13, 13.2-STABLE)
2023-09-06 16:57:02 UTC (releng/13.2, 13.2-RELEASE-p3)
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
FreeBSD's pcib(4) PCI-e bridge driver implements support for hot-plugging PCIe
devices. When attaching to a hot-plug-capable slot, the pcib(4) driver
allocates a MSI or MSI-X vector used to trigger handling of hot-plug
events.
II. Problem Description
The code which allocated the hot-plug interrupt did not allocate MSI-X
vectors properly. When attaching to devices which support only MSI-X
messages, the interrupt would not be allocated.
III. Impact
PCIe hot-plug would fail to work for certain devices. In particular,
this affects certain Amazon EC2 instance types which require functional
hot-plug support in order to attach network devices.
IV. Workaround
No workaround is available for affected devices.
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 amd64, i386, or
(on FreeBSD 13 and later) arm64 platforms can be updated via the
freebsd-update(8) utility:
# freebsd-update fetch
# freebsd-update install
# shutdown -r +10min "Rebooting for an erratum 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-23:10/pci.patch
# fetch https://security.FreeBSD.org/patches/EN-23:10/pci.patch.asc
# gpg --verify pci.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
This issue is corrected by the corresponding Git commit hash or Subversion
revision number in the following stable and release branches:
Branch/path Hash Revision
- -------------------------------------------------------------------------
stable/13/ 12ce57e6d3e7 stable/13-n255700
releng/13.2/ e80d2d894ff1 releng/13.2-n254629
- -------------------------------------------------------------------------
Run the following command to see which files were modified by a
particular commit:
# git show --stat <commit hash>
Or visit the following URL, replacing NNNNNN with the hash:
<URL:https://cgit.freebsd.org/src/commit/?id=NNNNNN>
To determine the commit count in a working tree (for comparison against
nNNNNNN in the table above), run:
# git rev-list --count --first-parent HEAD
VII. References
<URL:https://reviews.freebsd.org/D40581>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-23:10.pci.asc>
-----BEGIN PGP SIGNATURE-----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=N9UQ
-----END PGP SIGNATURE-----