From owner-svn-src-all@freebsd.org Fri Apr 14 18:33:22 2017 Return-Path: Delivered-To: svn-src-all@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 5DF83D3E7B6; Fri, 14 Apr 2017 18:33:22 +0000 (UTC) (envelope-from avg@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 mx1.freebsd.org (Postfix) with ESMTPS id 204942E3; Fri, 14 Apr 2017 18:33:22 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v3EIXLF1075365; Fri, 14 Apr 2017 18:33:21 GMT (envelope-from avg@FreeBSD.org) Received: (from avg@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v3EIXLBi075363; Fri, 14 Apr 2017 18:33:21 GMT (envelope-from avg@FreeBSD.org) Message-Id: <201704141833.v3EIXLBi075363@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: avg set sender to avg@FreeBSD.org using -f From: Andriy Gapon Date: Fri, 14 Apr 2017 18:33:21 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-vendor@freebsd.org Subject: svn commit: r316925 - vendor-sys/illumos/dist/uts/common/fs/zfs X-SVN-Group: vendor-sys 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: 2.1.23 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: Fri, 14 Apr 2017 18:33:22 -0000 Author: avg Date: Fri Apr 14 18:33:20 2017 New Revision: 316925 URL: https://svnweb.freebsd.org/changeset/base/316925 Log: 6101 attempt to lzc_create() a filesystem under a volume results in a panic illumos/illumos-gate@b127fe3c059af7adf772735498680b4f2e1405ef https://github.com/illumos/illumos-gate/commit/b127fe3c059af7adf772735498680b4f2e1405ef https://www.illumos.org/issues/6101 lzc_create(), or more correctly, zfs_ioc_create() does not reject an attempt to create a filesystem as a child of a volume, instead it proceeds to a crash. A crash stack obtained on FreeBSD: page fault while in kernel mode zap_leaf_lookup() fzap_lookup() zap_lookup_norm() zap_lookup() zfs_get_zplprop() zfs_fill_zplprops_impl() zfs_ioc_create() zfsdev_ioctl() devfs_ioctl_f() kern_ioctl() sys_ioctl() This crash happened with a kernel without debugging assertions. The immediate cause of crash appears to an attempt to interpret a zvol object as a zap object. For filesystems: #define MASTER_NODE_OBJ 1 For zvols: #define ZVOL_OBJ 1ULL #define ZVOL_ZAP_OBJ 2ULL So, I see two problems here: 1. an attempt to create a filesystem under a zvol should be rejected as early as possible, maybe in zfs_fill_zplprops() 2. maybe zap_lookup / zap_lockdir should reject objects that are not of one of the zap object types Reviewed by: Matthew Ahrens Approved by: Dan McDonald Author: Andriy Gapon Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_vfsops.c Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c Fri Apr 14 18:32:38 2017 (r316924) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c Fri Apr 14 18:33:20 2017 (r316925) @@ -3035,6 +3035,9 @@ zfs_fill_zplprops_impl(objset_t *os, uin ASSERT(zplprops != NULL); + if (os != NULL && os->os_phys->os_type != DMU_OST_ZFS) + return (SET_ERROR(EINVAL)); + /* * Pull out creator prop choices, if any. */ Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_vfsops.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_vfsops.c Fri Apr 14 18:32:38 2017 (r316924) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_vfsops.c Fri Apr 14 18:33:20 2017 (r316925) @@ -2243,8 +2243,10 @@ zfs_get_zplprop(objset_t *os, zfs_prop_t else pname = zfs_prop_to_name(prop); - if (os != NULL) + if (os != NULL) { + ASSERT3U(os->os_phys->os_type, ==, DMU_OST_ZFS); error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value); + } if (error == ENOENT) { /* No value set, use the default value */