From patchwork Wed Sep 28 01:09:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ian Kent X-Patchwork-Id: 12991544 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 B5383C6FA83 for ; Wed, 28 Sep 2022 01:15:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232166AbiI1BPN (ORCPT ); Tue, 27 Sep 2022 21:15:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57272 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232160AbiI1BPL (ORCPT ); Tue, 27 Sep 2022 21:15:11 -0400 X-Greylist: delayed 303 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Tue, 27 Sep 2022 18:15:03 PDT Received: from smtp01.aussiebb.com.au (smtp01.aussiebb.com.au [IPv6:2403:5800:3:25::1001]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E82D31C433; Tue, 27 Sep 2022 18:15:02 -0700 (PDT) Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp01.aussiebb.com.au (Postfix) with ESMTP id 9D1A81002E8; Wed, 28 Sep 2022 11:09:50 +1000 (AEST) X-Virus-Scanned: Debian amavisd-new at smtp01.aussiebb.com.au Received: from smtp01.aussiebb.com.au ([127.0.0.1]) by localhost (smtp01.aussiebb.com.au [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pQx7apNrMsWf; Wed, 28 Sep 2022 11:09:50 +1000 (AEST) Received: by smtp01.aussiebb.com.au (Postfix, from userid 116) id 9653210030B; Wed, 28 Sep 2022 11:09:50 +1000 (AEST) Received: from donald.themaw.net (180-150-90-198.b4965a.per.nbn.aussiebb.net [180.150.90.198]) by smtp01.aussiebb.com.au (Postfix) with ESMTP id 2560D1002E7; Wed, 28 Sep 2022 11:09:48 +1000 (AEST) Subject: [PATCH] vfs: parse sloppy mount option in correct order From: Ian Kent To: Al Viro Cc: Kernel Mailing List , linux-fsdevel , Steve French , linux-cifs@vger.kernel.org, Trond Myklebust , linux-nfs-list , Jeff Layton , David Wysochanski , David Howells , Miklos Szeredi , Roberto Bergantinos Corpas Date: Wed, 28 Sep 2022 09:09:47 +0800 Message-ID: <166432738753.7008.13932358518650344215.stgit@donald.themaw.net> User-Agent: StGit/1.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Roberto Bergantinos Corpas With addition of fs_context support, options string is parsed sequentially, if 'sloppy' option is not leftmost one, we may return ENOPARAM to userland if a non-valid option preceeds sloopy and mount will fail : host# mount -o quota,sloppy 172.23.1.225:/share /mnt mount.nfs: an incorrect mount option was specified host# mount -o sloppy,quota 172.23.1.225:/share /mnt host# This patch correct that behaviour so that sloppy takes precedence if specified anywhere on the string changes since v1: - add a boolean to fs context and postpone error reporting until parsing is done. Signed-off-by: Roberto Bergantinos Corpas --- fs/cifs/fs_context.c | 4 ++-- fs/cifs/fs_context.h | 1 - fs/fs_context.c | 14 ++++++++++++-- fs/nfs/fs_context.c | 5 +++-- fs/nfs/internal.h | 1 - include/linux/fs_context.h | 2 ++ 6 files changed, 19 insertions(+), 8 deletions(-) diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c index 0e13dec86b25..32c3fdd7d27a 100644 --- a/fs/cifs/fs_context.c +++ b/fs/cifs/fs_context.c @@ -864,7 +864,7 @@ static int smb3_fs_context_parse_param(struct fs_context *fc, if (!skip_parsing) { opt = fs_parse(fc, smb3_fs_parameters, param, &result); if (opt < 0) - return ctx->sloppy ? 1 : opt; + return fc->sloppy ? 1 : opt; } switch (opt) { @@ -1420,7 +1420,7 @@ static int smb3_fs_context_parse_param(struct fs_context *fc, ctx->multiuser = true; break; case Opt_sloppy: - ctx->sloppy = true; + fc->sloppy = true; break; case Opt_nosharesock: ctx->nosharesock = true; diff --git a/fs/cifs/fs_context.h b/fs/cifs/fs_context.h index bbaee4c2281f..75e4c41466fa 100644 --- a/fs/cifs/fs_context.h +++ b/fs/cifs/fs_context.h @@ -157,7 +157,6 @@ struct smb3_fs_context { bool uid_specified; bool cruid_specified; bool gid_specified; - bool sloppy; bool got_ip; bool got_version; bool got_rsize; diff --git a/fs/fs_context.c b/fs/fs_context.c index df04e5fc6d66..911a36bf2226 100644 --- a/fs/fs_context.c +++ b/fs/fs_context.c @@ -157,8 +157,15 @@ int vfs_parse_fs_param(struct fs_context *fc, struct fs_parameter *param) if (ret != -ENOPARAM) return ret; - return invalf(fc, "%s: Unknown parameter '%s'", - fc->fs_type->name, param->key); + /* We got an invalid parameter, but sloppy may have been specified + * later on param string. + * Let's wait to process whole params to return EINVAL. + */ + + fc->param_inval = true; + errorf(fc, "%s: Unknown parameter '%s'", fc->fs_type->name, param->key); + + return 0; } EXPORT_SYMBOL(vfs_parse_fs_param); @@ -234,6 +241,9 @@ int generic_parse_monolithic(struct fs_context *fc, void *data) } } + if (!fc->sloppy && fc->param_inval) + ret = -EINVAL; + return ret; } EXPORT_SYMBOL(generic_parse_monolithic); diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c index 4da701fd1424..09da63cc84f7 100644 --- a/fs/nfs/fs_context.c +++ b/fs/nfs/fs_context.c @@ -485,7 +485,7 @@ static int nfs_fs_context_parse_param(struct fs_context *fc, opt = fs_parse(fc, nfs_fs_parameters, param, &result); if (opt < 0) - return (opt == -ENOPARAM && ctx->sloppy) ? 1 : opt; + return (opt == -ENOPARAM && fc->sloppy) ? 1 : opt; if (fc->security) ctx->has_sec_mnt_opts = 1; @@ -853,7 +853,8 @@ static int nfs_fs_context_parse_param(struct fs_context *fc, * Special options */ case Opt_sloppy: - ctx->sloppy = true; + fc->sloppy = true; + dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); break; } diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 898dd95bc7a7..83552def96f1 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -90,7 +90,6 @@ struct nfs_fs_context { bool internal; bool skip_reconfig_option_check; bool need_mount; - bool sloppy; unsigned int flags; /* NFS{,4}_MOUNT_* flags */ unsigned int rsize, wsize; unsigned int timeo, retrans; diff --git a/include/linux/fs_context.h b/include/linux/fs_context.h index ff1375a16c8c..d91d42bc06ce 100644 --- a/include/linux/fs_context.h +++ b/include/linux/fs_context.h @@ -111,6 +111,8 @@ struct fs_context { bool need_free:1; /* Need to call ops->free() */ bool global:1; /* Goes into &init_user_ns */ bool oldapi:1; /* Coming from mount(2) */ + bool sloppy:1; /* If fs support it and was specified */ + bool param_inval:1; /* If set, check sloppy value */ }; struct fs_context_operations {