174 lines
6.8 KiB
Text
174 lines
6.8 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-EN-14:06.exec Errata Notice
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The FreeBSD Project
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Topic: triple-fault when executing from a threaded process
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Category: core
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Module: kern
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Announced: 2014-06-03
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Credits: Ivo De Decker and Debian GNU/kFreeBSD porters
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Affects: All supported versions of FreeBSD.
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Corrected: 2014-05-23 09:29:04 UTC (stable/10, 10.0-STABLE)
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2014-06-03 19:02:52 UTC (releng/10.0, 10.0-RELEASE-p4)
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2014-05-23 11:56:32 UTC (stable/9, 9.2-STABLE)
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2014-06-03 19:03:11 UTC (releng/9.2, 9.2-RELEASE-p7)
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2014-06-03 19:03:11 UTC (releng/9.1, 9.1-RELEASE-p14)
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2014-05-23 09:48:42 UTC (stable/8, 8.4-STABLE)
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2014-06-03 19:03:23 UTC (releng/8.4, 8.4-RELEASE-p11)
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CVE Name: CVE-2014-3880
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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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0. Revision History
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v1.0 2014-06-03 Initial release.
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v1.1 2014-06-03 Corrected some technical details for the advisory.
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v1.1 2014-06-04 Corrected a typo.
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I. Background
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The execve(2) and fexecve(2) system calls transforms the calling process
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into a new process, constructed from an ordinary file.
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When executing a new process, the FreeBSD virtual memory subsystem tries to
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optimize the process by avoiding destroying the old virtual memory address
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space when the calling process does not share its address space with another
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process (for instance, via rfork(2) with RFMEM) and when the new
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minimum/maximum address limit stays the same. In the optimized scenario,
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the virtual memory subsystem only removes usermode mappings from the existing
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virtual memory address space instead of destroying and recreating it.
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II. Problem Description
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When the virtual memory address space is recreated for the calling
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process, the old virtual memory address space, as well as its
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associated mappings, may be destroyed if the old address space is not
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suitable for the new image execution. The destruction happens before
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other threads in the current process are terminated. If the address
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space is destroyed, such threads still reference old address space and
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corresponding mapping structures, and an attempt to switch to them to
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gracefully terminate the remaining threads cause a triple fault and
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machine reset.
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III. Impact
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The system will reboot without any log or panic message when this
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happens due to a triple-fault triggered by dereferencing an invalid
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page table pointer.
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IV. Workaround
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No workaround is available, but systems that do not run binaries that are
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of different bit-ness (e.g. 32-bit and 64-bit binaries) are 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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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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[FreeBSD 8.4]
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# fetch http://security.FreeBSD.org/patches/EN-14:06/exec-8.4.patch
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# fetch http://security.FreeBSD.org/patches/EN-14:06/exec-8.4.patch.asc
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# gpg --verify exec-8.4.patch.asc
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[FreeBSD 9.1]
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# fetch http://security.FreeBSD.org/patches/EN-14:06/exec-9.1.patch
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# fetch http://security.FreeBSD.org/patches/EN-14:06/exec-9.1.patch.asc
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# gpg --verify exec-9.1.patch.asc
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[FreeBSD 9.2]
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# fetch http://security.FreeBSD.org/patches/EN-14:06/exec-9.2.patch
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# fetch http://security.FreeBSD.org/patches/EN-14:06/exec-9.2.patch.asc
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# gpg --verify exec-9.2.patch.asc
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[FreeBSD 10.0]
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# fetch http://security.FreeBSD.org/patches/EN-14:06/exec-10.0.patch
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# fetch http://security.FreeBSD.org/patches/EN-14:06/exec-10.0.patch.asc
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# gpg --verify exec-10.0.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: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/ r266583
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releng/8.4/ r267019
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stable/9/ r266585
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releng/9.1/ r267018
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releng/9.2/ r267018
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stable/10/ r266582
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releng/10.0/ r267017
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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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<URL:http://bugs.debian.org/743141>
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<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3880>
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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-14:06.exec.asc
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