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 X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90FCCC169C4 for ; Mon, 11 Feb 2019 15:14:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 572E3222A7 for ; Mon, 11 Feb 2019 15:14:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549898080; bh=pBnxoF1MfhXXgv2s7NpYzz+jHeA3fkqL38TB/Urps9k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Z3u65Qo7rbxp+sP0l7RGr6MewoGEXNTRsX/6o15UOzMipMIm1Emy5eflq6Zja1qCx BDkwEYBeGEFiPT7BXvatiGOzmgLaVZCLwxFrsqF665uTuCMeMyHvLAlS2rH/w7tqzw DhOSH0USdtJB/Z15ycvNppOQrltPGqP8JVrFxez0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728350AbfBKPI3 (ORCPT ); Mon, 11 Feb 2019 10:08:29 -0500 Received: from mail.kernel.org ([198.145.29.99]:58334 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391495AbfBKPI0 (ORCPT ); Mon, 11 Feb 2019 10:08:26 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 19EF7222A7; Mon, 11 Feb 2019 15:08:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549897705; bh=pBnxoF1MfhXXgv2s7NpYzz+jHeA3fkqL38TB/Urps9k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cCscd5xiVu/grJ4B4AnYdZhUGJR+Vd0m/SSr03QCI+XeLFitGUG+p2HdxnSiUVEKH Hxq8OLX05ge1Q7hApgMWCzf1nHs6vZ1/uv663PxJraHdxscOc+c7Uw2qdjfyEYwrdb ez+1WHdDlw5x3NmWzX3oJBW6AF2pUMJGRUNPmDUM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chris Perl , Anna Schumaker , Sasha Levin Subject: [PATCH 4.9 080/137] NFS: nfs_compare_mount_options always compare auth flavors. Date: Mon, 11 Feb 2019 15:19:21 +0100 Message-Id: <20190211141819.444919975@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141811.964925535@linuxfoundation.org> References: <20190211141811.964925535@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 594d1644cd59447f4fceb592448d5cd09eb09b5e ] This patch removes the check from nfs_compare_mount_options to see if a `sec' option was passed for the current mount before comparing auth flavors and instead just always compares auth flavors. Consider the following scenario: You have a server with the address 192.168.1.1 and two exports /export/a and /export/b. The first export supports `sys' and `krb5' security, the second just `sys'. Assume you start with no mounts from the server. The following results in EIOs being returned as the kernel nfs client incorrectly thinks it can share the underlying `struct nfs_server's: $ mkdir /tmp/{a,b} $ sudo mount -t nfs -o vers=3,sec=krb5 192.168.1.1:/export/a /tmp/a $ sudo mount -t nfs -o vers=3 192.168.1.1:/export/b /tmp/b $ df >/dev/null df: ‘/tmp/b’: Input/output error Signed-off-by: Chris Perl Signed-off-by: Anna Schumaker Signed-off-by: Sasha Levin --- fs/nfs/super.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 2fdb8f5a7b69..35aef192a13f 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -2403,8 +2403,7 @@ static int nfs_compare_mount_options(const struct super_block *s, const struct n goto Ebusy; if (a->acdirmax != b->acdirmax) goto Ebusy; - if (b->auth_info.flavor_len > 0 && - clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) + if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) goto Ebusy; return 1; Ebusy: -- 2.19.1