Date: Mon, 20 Jul 2009 19:16:43 +0000 (UTC) From: Edward Tomasz Napierala <trasz@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r195785 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <200907201916.n6KJGhEl086253@svn.freebsd.org>
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Author: trasz Date: Mon Jul 20 19:16:42 2009 New Revision: 195785 URL: http://svn.freebsd.org/changeset/base/195785 Log: Fix permission handling for extended attributes in ZFS. Without this change, ZFS uses SunOS Alternate Data Streams semantics - each EA has its own permissions, which are set at EA creation time and - unlike SunOS - invisible to the user and impossible to change. From the user point of view, it's just broken: sometimes access is granted when it shouldn't be, sometimes it's denied when it shouldn't be. This patch makes it behave just like UFS, i.e. depend on current file permissions. Also, it fixes returned error codes (ENOATTR instead of ENOENT) and makes listextattr(2) return 0 instead of EPERM where there is no EA directory (i.e. the file never had any EA). Reviewed by: pjd (idea, not actual code) Approved by: re (kib) Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_acl.c head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_acl.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_acl.c Mon Jul 20 19:12:08 2009 (r195784) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_acl.c Mon Jul 20 19:16:42 2009 (r195785) @@ -2360,6 +2360,15 @@ zfs_zaccess(znode_t *zp, int mode, int f is_attr = ((zp->z_phys->zp_flags & ZFS_XATTR) && (ZTOV(zp)->v_type == VDIR)); +#ifdef __FreeBSD__ + /* + * In FreeBSD, we don't care about permissions of individual ADS. + * Note that not checking them is not just an optimization - without + * this shortcut, EA operations may bogusly fail with EACCES. + */ + if (zp->z_phys->zp_flags & ZFS_XATTR) + return (0); +#else /* * If attribute then validate against base file */ @@ -2385,6 +2394,7 @@ zfs_zaccess(znode_t *zp, int mode, int f mode |= ACE_READ_NAMED_ATTRS; } } +#endif if ((error = zfs_zaccess_common(check_zp, mode, &working_mode, &check_privs, skipaclchk, cr)) == 0) { Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c Mon Jul 20 19:12:08 2009 (r195784) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c Mon Jul 20 19:16:42 2009 (r195785) @@ -831,8 +831,14 @@ zfs_make_xattrdir(znode_t *zp, vattr_t * *xvpp = NULL; + /* + * In FreeBSD, access checking for creating an EA is being done + * in zfs_setextattr(), + */ +#ifndef __FreeBSD__ if (error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr)) return (error); +#endif tx = dmu_tx_create(zfsvfs->z_os); dmu_tx_hold_bonus(tx, zp->z_id); @@ -906,12 +912,14 @@ top: ASSERT(zp->z_phys->zp_xattr == 0); -#ifdef TODO if (!(flags & CREATE_XATTR_DIR)) { zfs_dirent_unlock(dl); +#ifdef __FreeBSD__ + return (ENOATTR); +#else return (ENOENT); - } #endif + } if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) { zfs_dirent_unlock(dl); Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c Mon Jul 20 19:12:08 2009 (r195784) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c Mon Jul 20 19:16:42 2009 (r195785) @@ -4502,6 +4502,11 @@ vop_getextattr { vnode_t *xvp = NULL, *vp; int error, flags; + error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, + ap->a_cred, ap->a_td, VREAD); + if (error != 0) + return (error); + error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname, sizeof(attrname)); if (error != 0) @@ -4523,6 +4528,8 @@ vop_getextattr { vp = nd.ni_vp; NDFREE(&nd, NDF_ONLY_PNBUF); if (error != 0) { + if (error == ENOENT) + error = ENOATTR; ZFS_EXIT(zfsvfs); return (error); } @@ -4564,6 +4571,11 @@ vop_deleteextattr { vnode_t *xvp = NULL, *vp; int error, flags; + error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, + ap->a_cred, ap->a_td, VWRITE); + if (error != 0) + return (error); + error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname, sizeof(attrname)); if (error != 0) @@ -4584,6 +4596,8 @@ vop_deleteextattr { vp = nd.ni_vp; NDFREE(&nd, NDF_ONLY_PNBUF); if (error != 0) { + if (error == ENOENT) + error = ENOATTR; ZFS_EXIT(zfsvfs); return (error); } @@ -4623,6 +4637,11 @@ vop_setextattr { vnode_t *xvp = NULL, *vp; int error, flags; + error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, + ap->a_cred, ap->a_td, VWRITE); + if (error != 0) + return (error); + error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname, sizeof(attrname)); if (error != 0) @@ -4631,7 +4650,7 @@ vop_setextattr { ZFS_ENTER(zfsvfs); error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td, - LOOKUP_XATTR); + LOOKUP_XATTR | CREATE_XATTR_DIR); if (error != 0) { ZFS_EXIT(zfsvfs); return (error); @@ -4690,6 +4709,11 @@ vop_listextattr { vnode_t *xvp = NULL, *vp; int done, error, eof, pos; + error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, + ap->a_cred, ap->a_td, VREAD); + if (error) + return (error); + error = zfs_create_attrname(ap->a_attrnamespace, "", attrprefix, sizeof(attrprefix)); if (error != 0) @@ -4701,6 +4725,12 @@ vop_listextattr { error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td, LOOKUP_XATTR); if (error != 0) { + /* + * ENOATTR means that the EA directory does not yet exist, + * i.e. there are no extended attributes there. + */ + if (error == ENOATTR) + error = 0; ZFS_EXIT(zfsvfs); return (error); }
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