From owner-svn-src-all@freebsd.org Tue Feb 20 20:17:20 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 9CE0CF27539; Tue, 20 Feb 2018 20:17:20 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FCB76B017; Tue, 20 Feb 2018 20:17:20 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 49F2C6744; Tue, 20 Feb 2018 20:17:20 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w1KKHKQO044373; Tue, 20 Feb 2018 20:17:20 GMT (envelope-from mav@FreeBSD.org) Received: (from mav@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w1KKHK9B044372; Tue, 20 Feb 2018 20:17:20 GMT (envelope-from mav@FreeBSD.org) Message-Id: <201802202017.w1KKHK9B044372@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mav set sender to mav@FreeBSD.org using -f From: Alexander Motin Date: Tue, 20 Feb 2018 20:17:20 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r329659 - head/cddl/contrib/opensolaris/lib/libzfs/common X-SVN-Group: head X-SVN-Commit-Author: mav X-SVN-Commit-Paths: head/cddl/contrib/opensolaris/lib/libzfs/common X-SVN-Commit-Revision: 329659 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Feb 2018 20:17:20 -0000 Author: mav Date: Tue Feb 20 20:17:19 2018 New Revision: 329659 URL: https://svnweb.freebsd.org/changeset/base/329659 Log: MFV r316873: 7233 dir_is_empty should open directory with CLOEXEC illumos/illumos-gate@d420209d9c807f782c1d31f5683be74798142198 https://github.com/illumos/illumos-gate/commit/d420209d9c807f782c1d31f5683be74798142198 https://www.illumos.org/issues/7233 This fixes a race where one thread is executing zfs_mount() while another thread forks and execs. If the fork occurs while the directory is open, the child process will inherit (but not necessarily close immediately) the open fd for the directory, preventing the mount. Reviewed by: Matthew Ahrens Reviewed by: Paul Dagnelie Approved by: Richard Lowe Author: Alex Reece Modified: head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c Directory Properties: head/cddl/contrib/opensolaris/ (props changed) head/cddl/contrib/opensolaris/lib/libzfs/ (props changed) Modified: head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c ============================================================================== --- head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c Tue Feb 20 20:14:11 2018 (r329658) +++ head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c Tue Feb 20 20:17:19 2018 (r329659) @@ -22,7 +22,7 @@ /* * Copyright 2015 Nexenta Systems, Inc. All rights reserved. * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2014 by Delphix. All rights reserved. + * Copyright (c) 2014, 2015 by Delphix. All rights reserved. * Copyright 2016 Igor Kozhukhov * Copyright 2017 Joyent, Inc. * Copyright 2017 RackTop Systems. @@ -67,6 +67,7 @@ #include #include #include +#include #include #include #include @@ -187,9 +188,16 @@ dir_is_empty(const char *dirname) { DIR *dirp; struct dirent64 *dp; + int dirfd; - if ((dirp = opendir(dirname)) == NULL) + if ((dirfd = openat(AT_FDCWD, dirname, + O_RDONLY | O_NDELAY | O_LARGEFILE | O_CLOEXEC, 0)) < 0) { return (B_TRUE); + } + + if ((dirp = fdopendir(dirfd)) == NULL) { + return (B_TRUE); + } while ((dp = readdir64(dirp)) != NULL) {