From owner-freebsd-announce@freebsd.org Wed Nov 4 13:14:49 2015 Return-Path: Delivered-To: freebsd-announce@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 5453DA245B9 for ; Wed, 4 Nov 2015 13:14:49 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:1900:2254:206c::16:87]) by mx1.freebsd.org (Postfix) with ESMTP id 3753A1E77; Wed, 4 Nov 2015 13:14:49 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: by freefall.freebsd.org (Postfix, from userid 1025) id 368A81AD1; Wed, 4 Nov 2015 13:14:49 +0000 (UTC) From: FreeBSD Errata Notices To: FreeBSD Errata Notices Reply-To: freebsd-stable@freebsd.org Precedence: bulk Message-Id: <20151104131449.368A81AD1@freefall.freebsd.org> Date: Wed, 4 Nov 2015 13:14:49 +0000 (UTC) Subject: [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-15:19.kqueue X-BeenThere: freebsd-announce@freebsd.org X-Mailman-Version: 2.1.20 List-Id: "Project Announcements \[moderated\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Nov 2015 13:14:49 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-EN-15:19.kqueue Errata Notice The FreeBSD Project Topic: kqueue write events for files greater 2GB would never fire Category: core Module: kern Announced: 2015-11-04 Credits: Steven Hartland Affects: All supported versions of FreeBSD. Corrected: 2015-09-24 08:42:08 UTC (stable/10, 10.2-STABLE) 2015-11-04 11:27:13 UTC (releng/10.2, 10.2-RELEASE-p7) 2015-11-04 11:27:21 UTC (releng/10.1, 10.1-RELEASE-p24) 2015-09-24 09:35:35 UTC (stable/9, 9.3-STABLE) 2015-11-04 11:27:30 UTC (releng/9.3, 9.3-RELEASE-p30) For general information regarding FreeBSD Errata Notices and Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background The kqueue(2) system call provides a generic method of notifying the user when an event happens or a condition holds, based on the results of small pieces of kernel code termed filters. II. Problem Description Due to int usage for file offsets in the VOP_WRITE_(PRE|POST) macros, kqueue(2) write events for files greater 2GB where never fired. III. Impact Any kqueue(2) consumer monitoring for file changes will fail to receive an event if the monitored file is greater than 2GB. This causes commands such as 'tail -f' to never see updates. IV. Workaround For the specific case of tail(1), using '-F' instead of '-f' avoids the issue, however other consumers of kqueue(2) events to monitor files do not have a workaround. V. Solution Perform one of the following: 1) Upgrade your system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, and reboot the system. 2) To update your present system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install And reboot the system. 3) To update your present system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch https://security.FreeBSD.org/patches/EN-15:19/kqueue.patch # fetch https://security.FreeBSD.org/patches/EN-15:19/kqueue.patch.asc # gpg --verify kqueue.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in and reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/9/ r288168 releng/9.3/ r290363 stable/10/ r288167 releng/10.1/ r290362 releng/10.2/ r290361 - ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: VII. References The latest revision of this Errata Notice is available at https://security.FreeBSD.org/advisories/FreeBSD-EN-15:19.kqueue.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCgAGBQJWOe7vAAoJEO1n7NZdz2rneAkP/0FCRnyH6vkJFZBbfdIQY5u7 XPSbSD+2847aJRWw/xU+FWHsFjjcfKrvKqgRtdZXkTBe3FjTgiNbf6jQRCSy0f6u odcPXt4ZprXmhn6BOsyF92NgDHE5VXIiO1h0Jz1Y/+PTi/52BjNbevGUox6VpbMc t9XwxuARKG5bSNU+QdWdilP4H//+SAxuhK4Y96i6pccbT51DoO3ACCa8EpuOJYW9 elXTQbB4XC1n0EATr5gtTwKE+5/yPDEgl9pPNjsN8UTWCqzPwxPTwfplf3idN5Vq Oe5YIiI5aaAE16fSYUkIZR0kZ/ScR6gbmc2ALKRtHPa4+9g9TpNINpfmreV2htfH CrUW4qGZaoABpX1X2sFJ6su2NCgW3DliOuSAJUyK8Re2XEJZVfcVauyWaZxocJhu NRoH8yBoLJKrPB0Z3Dr9eygmDNGEvaFUB/ZpbeCbyebwyFTmTMUshwfZwcfPftaB bNd+R4J9UkY5wJWYUve7VpGDY2L6+j2MoPnlZJDfZZpYmFByD/GmdV5Pxxl4yEj3 2DBevZIGOGlH9E26JrPTcCYjkX15OS0KUkWQy7xv1jdxXCZ4AVbRq8CRiFdQ2JPU uSsrwgrGPdYkku0k6xXbb5YDw4475lQPAy9gMSeEDCqcl4GjKf1AVbrN9Jq73C8o c65YAK83vX3x9HDWCrss =OODP -----END PGP SIGNATURE-----