dcb9c59cc2
Fix bsnmpd remote denial of service vulnerability. [SA-14:01] Fix ntpd distributed reflection Denial of Service vulnerability. [SA-14:02] Fix OpenSSL multiple vulnerabilities. [SA-14:03] Fix BIND remote denial of service vulnerability. [SA-14:04] Disable hardware RNGs by default. [EN-14:01] Fix incorrect coalescing of stack entry with mmap. [EN-14:02]
127 lines
4.9 KiB
Text
127 lines
4.9 KiB
Text
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=============================================================================
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FreeBSD-EN-14:02.mmap Errata Notice
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The FreeBSD Project
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Topic: mmap should not coalesce stack entry
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Category: core
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Module: kernel
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Announced: 2014-01-14
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Credits: Konstantin Belousov
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Affects: All supported versions of FreeBSD.
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Corrected: 2013-12-30 08:57:54 UTC (stable/10, 10.0-PRERELEASE)
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2013-12-31 08:02:34 UTC (releng/10.0, 10.0-RC4)
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2013-12-31 08:02:34 UTC (releng/10.0, 10.0-RC3-p1)
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2013-12-31 08:02:34 UTC (releng/10.0, 10.0-RC2-p1)
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2013-12-31 08:02:34 UTC (releng/10.0, 10.0-RC1-p1)
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2013-12-30 09:04:06 UTC (stable/9, 9.2-STABLE)
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2014-01-14 19:42:28 UTC (releng/9.2, 9.2-RELEASE-p3)
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2014-01-14 19:42:28 UTC (releng/9.1, 9.1-RELEASE-p10)
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2014-01-14 19:33:28 UTC (stable/8, 8.4-STABLE)
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2014-01-14 19:42:28 UTC (releng/8.4, 8.4-RELEASE-p7)
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2014-01-14 19:42:28 UTC (releng/8.3, 8.3-RELEASE-p14)
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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 FreeBSD virtual memory system allows growing stack by mapping anonymous
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memory region on top of a stack via mmap(2) system call with MAP_STACK bit
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enabled in flags parameter.
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II. Problem Description
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The FreeBSD virtual memory system tries to coalesce adjacent memory regions
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into one single object when possible. When growing the stack via mmap(2), it
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will also try to coalesce the newly allocated memory into the existing object.
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This would result in a failed assertion later in vm_map_stack(), which expects
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that a new object is returned.
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III. Impact
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The system will panic when this happens.
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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 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-14:02/mmap.patch
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# fetch http://security.FreeBSD.org/patches/EN-14:02/mmap.patch.asc
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# gpg --verify mmap.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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3) 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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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/ r260645
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releng/8.3/ r260647
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releng/8.4/ r260647
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stable/9/ r260082
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releng/9.1/ r260647
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releng/9.2/ r260647
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stable/10/ r260081
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releng/10.0/ r260122
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- -------------------------------------------------------------------------
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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-14:02.mmap.asc
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