139 lines
5.5 KiB
Text
139 lines
5.5 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-EN-14:12.zfs Errata Notice
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The FreeBSD Project
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Topic: NFSv4 and ZFS cache consistency issue
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Category: contrib
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Module: zfs
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Announced: 2014-11-04
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Credits: Bart Hsiao, Marcelo Araujo, Kevin Buhr
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Affects: All supported versions of FreeBSD.
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Corrected: 2014-10-07 06:00:09 UTC (stable/10, 10.0-STABLE)
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2014-10-15 06:31:08 UTC (releng/10.1, 10.1-RC2)
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2014-11-04 23:31:17 UTC (releng/10.0, 10.0-RELEASE-p12)
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2014-10-07 06:00:32 UTC (stable/9, 9.3-STABLE)
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2014-11-04 23:33:46 UTC (releng/9.3, 9.3-RELEASE-p5)
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2014-11-04 23:33:17 UTC (releng/9.2, 9.2-RELEASE-p15)
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2014-11-04 23:32:45 UTC (releng/9.1, 9.1-RELEASE-p22)
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2014-11-04 23:30:23 UTC (stable/8, 8.4-STABLE)
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2014-11-04 23:32:15 UTC (releng/8.4, 8.4-RELEASE-p19)
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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:http://security.freebsd.org/>.
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I. Background
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The Network File System (NFS) allows a host to export some or all of
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its file systems that can be any kind of file systems such like UFS, ZFS
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etcetera, so that other hosts can access them over the network and mount
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them as if they were on local disks.
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II. Problem Description
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In a configuration where two or more clients mount a ZFS file system over
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NFSv4 from a FreeBSD server, if client1 caches a directory listing and a
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file in the directory is renamed on client2, then client1 can end up in
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a state where the cached but incorrect directory contents persists indefinitely
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and is never updated.
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III. Impact
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When client2 renames a file or directory, client1 does not receive the
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changed attributes and never does a READDIR to get the updated contents.
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This could result in a client that has incorrect information about the
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actual content of the mounted file system.
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IV. Workaround
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No workaround is available.
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V. Solution
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Perform one of the following:
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1) Upgrade your system to a supported FreeBSD stable or release / security
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branch (releng) dated after the correction date.
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2) 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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3) To update your present 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 http://security.FreeBSD.org/patches/EN-14:12/zfs.patch
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# fetch http://security.FreeBSD.org/patches/EN-14:12/zfs.patch.asc
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# gpg --verify zfs.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/zfs.patch
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c) Recompile your kernel as described in
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<URL:http://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 revision numbers of each file that was
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corrected in FreeBSD.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/8/ r274108
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releng/8.4/ r274111
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stable/9/ r272677
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releng/9.1/ r274112
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releng/9.2/ r274113
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releng/9.3/ r274114
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stable/10/ r272676
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releng/10.0/ r274110
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releng/10.1/ r273122
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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:http://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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The latest revision of this Errata Notice is available at
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http://security.FreeBSD.org/advisories/FreeBSD-EN-14:12.zfs.asc
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