3bdc44ff8a
o Fix kqueue write events never fired for files greater 2GB. [2] o Fix kpplications exiting due to segmentation violation on a correct memory address. [3] PR: 204046 [1] PR: 204203 [1] Errata Notice: FreeBSD-EN-15:19.kqueue [2] Errata Notice: FreeBSD-EN-15:20.vm [3] Approved by: so
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137 lines
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=============================================================================
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FreeBSD-EN-15:20.vm Errata Notice
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The FreeBSD Project
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Topic: Applications exiting due to segmentation violation
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on a correct memory address
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Category: core
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Module: kernel
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Announced: 2015-11-04
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Credits: Konstantin Belousov
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Affects: All supported versions of FreeBSD.
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Corrected: 2015-09-15 04:20:39 UTC (stable/10, 10.2-STABLE)
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2015-11-04 11:27:13 UTC (releng/10.2, 10.2-RELEASE-p7)
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2015-11-04 11:27:21 UTC (releng/10.1, 10.1-RELEASE-p24)
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2015-10-30 13:05:39 UTC (stable/9, 9.3-STABLE)
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2015-11-04 11:27:30 UTC (releng/9.3, 9.3-RELEASE-p30)
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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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The FreeBSD virtual memory system provides processes with virtual
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address space. Features of virtual address space include copy-on-write
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pages and page wiring.
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II. Problem Description
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A race condition exists in the virtual memory implementation. When an
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application writes to a valid address in its address space, and the
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corresponding map entry is marked as copy-on-write, and right now
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undergoes wiring process, and the corresponding page does not yet have
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a page table entry installed, the application receives a segmentation
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violation signal. A usual case for this scenario to happen is a write
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into a never written map entry in a child process right after fork(2)
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system call.
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III. Impact
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Under certain conditions, a correctly behaving application could be
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terminated.
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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 and reboot the system.
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2) To update your vulnerable 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
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3) To update your vulnerable 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-15:20/vm.patch
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# fetch https://security.FreeBSD.org/patches/EN-15:20/vm.patch.asc
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# gpg --verify vm.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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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/ r290194
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releng/9.3/ r290363
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stable/10/ r287846
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releng/10.1/ r290362
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releng/10.2/ r290361
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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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<URL:https://svnweb.freebsd.org/base?view=revision&revision=r287591>
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<URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204048>
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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-15:20.vm.asc>
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