3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
118 lines
4.4 KiB
Text
118 lines
4.4 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-04:11.msync Security Advisory
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The FreeBSD Project
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Topic: buffer cache invalidation implementation issues
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Category: core
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Module: sys
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Announced: 2004-05-26
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Credits: Stephan Uphoff <ups@tree.com>
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Matt Dillon <dillon@apollo.backplane.com>
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Affects: All FreeBSD versions prior to the correction date
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Corrected: 2004-05-25 22:46:38 UTC (RELENG_4, 4.10-STABLE)
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2004-05-25 23:07:55 UTC (RELENG_5_2, 5.2.1-RELEASE-p8)
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2004-05-22 23:09:19 UTC (RELENG_4_10, 4.10-RELEASE)
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2004-05-25 23:01:21 UTC (RELENG_4_9, 4.9-RELEASE-p9)
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2004-05-25 23:01:19 UTC (RELENG_4_8, 4.8-RELEASE-p22)
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CVE Name: CAN-2004-0435
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FreeBSD only: YES
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For general information regarding FreeBSD Security Advisories,
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including descriptions of the fields above, security branches, and the
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following sections, please visit
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<URL:http://www.freebsd.org/security/>.
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I. Background
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The msync(2) system call is used by applications to request that
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modified memory pages are written to permanent storage.
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II. Problem Description
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Programming errors in the implementation of the msync(2) system call
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involving the MS_INVALIDATE operation lead to cache consistency
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problems between the virtual memory system and on-disk contents.
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III. Impact
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In some situations, a user with read access to a file may be able to
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prevent changes to that file from being committed to disk.
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IV. Workaround
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There is no workaround.
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V. Solution
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Perform one of the following:
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1) Upgrade your vulnerable system to 4-STABLE; or to the RELENG_5_2,
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RELENG_4_10, RELENG_4_9, or RELENG_4_8 security branch dated after the
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correction date.
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2) To patch your present system:
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The following patches have been verified to apply to FreeBSD 4.8, 4.9,
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4.10 and 5.2 systems.
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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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[FreeBSD 5.2]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:11/msync5.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:11/msync5.patch.asc
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[FreeBSD 4.8, 4.9, 4.10]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:11/msync4.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:11/msync4.patch.asc
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b) Apply the patch.
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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: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 Revision
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Path
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- -------------------------------------------------------------------------
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RELENG_4
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src/sys/ufs/ufs/ufs_readwrite.c 1.65.2.16
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src/sys/vm/vm_map.c 1.187.2.30
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RELENG_4_10
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src/sys/ufs/ufs/ufs_readwrite.c 1.65.2.14.4.1
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src/sys/vm/vm_map.c 1.187.2.24.2.4
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RELENG_4_9
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src/UPDATING 1.73.2.89.2.10
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src/sys/conf/newvers.sh 1.44.2.32.2.10
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src/sys/ufs/ufs/ufs_readwrite.c 1.65.2.14.2.1
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src/sys/vm/vm_map.c 1.187.2.23.2.1
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RELENG_4_8
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src/UPDATING 1.73.2.80.2.25
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src/sys/conf/newvers.sh 1.44.2.29.2.23
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src/sys/ufs/ufs/ufs_readwrite.c 1.65.2.13.2.1
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src/sys/vm/vm_map.c 1.187.2.17.2.1
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RELENG_5_2
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src/UPDATING 1.282.2.16
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src/sys/conf/newvers.sh 1.56.2.15
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src/sys/ufs/ffs/ffs_vnops.c 1.119.2.1
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src/sys/vm/vm_object.c 1.317.2.1
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- -------------------------------------------------------------------------
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