FreeBSD Errata Notices
2021-Aug-24 20:51 UTC
[FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-21:23.virtio_blk
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================FreeBSD-EN-21:23.virtio_blk Errata Notice The FreeBSD Project Topic: virtio_blk(4) fails to attach on some hypervisors Category: core Module: virtio_blk Announced: 2021-08-24 Affects: FreeBSD 13.0 Corrected: 2021-06-28 15:16:29 UTC (stable/13, 13.0-STABLE) 2021-08-24 16:36:55 UTC (releng/13.0, 13.0-RELEASE-p4) 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 VirtIO is a specification for para-virtualized I/O in a virtual machine (VM). It defines an interface for efficient I/O between the hypervisor and VM. virtio_blk(4) is a driver handling VirtIO block devices. II. Problem Description The virtio_blk(4) driver sends commands to the host to query disk identifiers before acknowledging to the host that the driver is ready. III. Impact Affected versions of FreeBSD will not boot under some hypervisors, or under the presence of modern and non-transitional VirtIO block devices. IV. Workaround No workaround is available. FreeBSD running in QEMU emulator is not affected by this issue. 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-21:23/virtio_blk.patch # fetch https://security.FreeBSD.org/patches/EN-21:23/virtio_blk.patch.asc # gpg --verify virtio_blk.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/ 6fd5a4a6f3ac stable/13-n246114 releng/13.0/ f66e34809906 releng/13.0-n244753 - ------------------------------------------------------------------------- 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 The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-21:23.virtio_blk.asc> -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAmElV04ACgkQ05eS9J6n 5cK9NQ//cT8k06JwzqJ1rh09OK/XM9GWxXDuI/YHV4bQ8zc15aSM+PoS2FHgpcDy BaoyDBp1pFgvx/QxbWdHUYam1SZac3vqbe7qfw/QKQopC8sjgdbqTxcCPmk8qh/r upfqaLmtlxYBxxKEPtr1DUVUzt+qqT6jWK6cCR6KjXKFGQNh0DiYGopmiwPbQzYQ s2nLnQqX5UwgSLNPgY95Aam1RsKiQcSgPkegmKvbhHdgYoal7EDJ8htMnSHBYkhV K/tQ98572xKwpywpQEXvDehaGgov7XQellvA9LchKnONfrRDu23I3Ud7WmA/APwk YFRQs6S2kQGjmUIOLYb+Ey+xROOSmiIePA7e1/hVOtdkhkaeUNqXbBVyQKmHBv6k oipHzgnDQ87wlCV9NT77TevvGc7uzJ4iI9nwvecnLDeLEL8Fuuy7QaBd3KGgbEaN p2C4jBWkfjppvNovR4bCIj6uhgwKuxR6m/IH9oM38I/vtIsr03/ozX6fJT5SGrk3 XbxhXC7suolWZcKKlIQc+ReZnHOrR/4p1sHG3DcKYzP3Y9NjBUYwR+uf6WCB+v+y /jADR/Co88bEkKTK7Dexfz8cK9QQO8NvK6jkNkx7Q46ZagHgQaNVYKASsYeLcW13 ns3qKL8E7lOgJtcSX+1l39iJ9nYGdERMP7BwkuFO3iSAQP5e1mM=Cc2A -----END PGP SIGNATURE-----