137 lines
5 KiB
Text
137 lines
5 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-EN-16:08.zfs Errata Notice
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The FreeBSD Project
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Topic: Memory leak in ZFS
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Category: contrib
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Module: zfs
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Announced: 2016-05-04
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Credits: Eric Borisch
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Affects: All supported versions of FreeBSD.
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Corrected: 2016-03-18 13:32:00 UTC (stable/10, 10.3-STABLE)
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2016-05-04 15:25:47 UTC (releng/10.3, 10.3-RELEASE-p2)
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2016-05-04 15:26:23 UTC (releng/10.2, 10.2-RELEASE-p16)
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2016-05-04 15:27:09 UTC (releng/10.1, 10.1-RELEASE-p33)
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2016-03-18 13:32:37 UTC (stable/9, 9.3-STABLE)
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2016-05-04 15:27:09 UTC (releng/9.3, 9.3-RELEASE-p41)
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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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ZFS is one of several filesystems available on FreeBSD. ZFS supports many
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advanced features, including snapshots, which provides a frozen read-only
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image of file system at a given time.
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File system snapshots can be accessed under the .zfs/snapshot directory
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in the root of the file system.
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II. Problem Description
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There is a memory leak in the error path when mounting a snapshot via the
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automatic .zfs/snapshot directory, which can be triggered when the snapshot
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was once mounted, but later deleted by the system administrator.
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III. Impact
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A local user may be able to trigger the memory leak multiple times and
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eventually exhaust kernel memory, if the user knows a snapshot and access
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it before the system administrator deletes it.
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IV. Workaround
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No workaround is available, but systems that do not use ZFS snapshots are
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not affected.
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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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Reboot is required.
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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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Reboot is required.
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3) 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-16:08/zfs.patch
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# fetch https://security.FreeBSD.org/patches/EN-16:08/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/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/9/ r297022
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releng/9.3/ r299068
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stable/10/ r297021
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releng/10.1/ r299068
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releng/10.2/ r299067
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releng/10.3/ r299066
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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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The latest revision of this advisory is available at
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<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-16:08.zfs.asc>
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