From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D13D6C0018A for ; Mon, 6 Nov 2023 13:11:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232045AbjKFNLw (ORCPT ); Mon, 6 Nov 2023 08:11:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232073AbjKFNLv (ORCPT ); Mon, 6 Nov 2023 08:11:51 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B8F15100 for ; Mon, 6 Nov 2023 05:11:48 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0758DC433C8; Mon, 6 Nov 2023 13:11:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1699276308; bh=JUFq5yO/YBGreBq6EuOpw6bcPRKYu3FYXEtq3pqyBTU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CL9WD7YbYyEDtgwuWXYDEgOs6xqSpj0KhwHYssOJLPfR30DuW1volNluml8GdOudD 5Xw8xK5asi9AqR3tw5u4pVVhsYqCzirx+uZkMfygPz5WYpNPVSsbLvk6HwAsO4bdiI sBq6TbZdvVma+dUF193o88fZNTrDeAWSGT8rzd9I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jeff Layton , Chuck Lever , Al Viro Subject: [PATCH 4.19 31/61] nfsd: lock_rename() needs both directories to live on the same fs Date: Mon, 6 Nov 2023 14:03:27 +0100 Message-ID: <20231106130300.683892260@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231106130259.573843228@linuxfoundation.org> References: <20231106130259.573843228@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Al Viro commit 1aee9158bc978f91701c5992e395efbc6da2de3c upstream. ... checking that after lock_rename() is too late. Incidentally, NFSv2 had no nfserr_xdev... Fixes: aa387d6ce153 "nfsd: fix EXDEV checking in rename" Cc: stable@vger.kernel.org # v3.9+ Reviewed-by: Jeff Layton Acked-by: Chuck Lever Tested-by: Jeff Layton Signed-off-by: Al Viro Signed-off-by: Greg Kroah-Hartman --- fs/nfsd/vfs.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1691,6 +1691,12 @@ nfsd_rename(struct svc_rqst *rqstp, stru if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) goto out; + err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; + if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) + goto out; + if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) + goto out; + host_err = fh_want_write(ffhp); if (host_err) { err = nfserrno(host_err); @@ -1724,12 +1730,6 @@ nfsd_rename(struct svc_rqst *rqstp, stru if (ndentry == trap) goto out_dput_new; - host_err = -EXDEV; - if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) - goto out_dput_new; - if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) - goto out_dput_new; - host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0); if (!host_err) { host_err = commit_metadata(tfhp);