From patchwork Thu Jun 3 20:52:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuck Lever X-Patchwork-Id: 12297983 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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 14058C47082 for ; Thu, 3 Jun 2021 20:52:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F099C613E7 for ; Thu, 3 Jun 2021 20:52:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229994AbhFCUyJ (ORCPT ); Thu, 3 Jun 2021 16:54:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:44954 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229576AbhFCUyI (ORCPT ); Thu, 3 Jun 2021 16:54:08 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 63AA261263; Thu, 3 Jun 2021 20:52:23 +0000 (UTC) Subject: [PATCH 18/29] lockd: Update the NLMv4 TEST arguments decoder to use struct xdr_stream From: Chuck Lever To: bfields@fieldses.org Cc: linux-nfs@vger.kernel.org Date: Thu, 03 Jun 2021 16:52:22 -0400 Message-ID: <162275354269.32691.11833072523415969778.stgit@klimt.1015granger.net> In-Reply-To: <162275337584.32691.3943139351165347555.stgit@klimt.1015granger.net> References: <162275337584.32691.3943139351165347555.stgit@klimt.1015granger.net> User-Agent: StGit/1.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Signed-off-by: Chuck Lever --- fs/lockd/xdr4.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 66 insertions(+), 6 deletions(-) diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c index d0960a8551f8..cf64794fdc1f 100644 --- a/fs/lockd/xdr4.c +++ b/fs/lockd/xdr4.c @@ -96,6 +96,32 @@ nlm4_decode_fh(__be32 *p, struct nfs_fh *f) return p + XDR_QUADLEN(f->size); } +/* + * NLM file handles are defined by specification to be a variable-length + * XDR opaque no longer than 1024 bytes. However, this implementation + * limits their length to the size of an NFSv3 file handle. + */ +static bool +svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh) +{ + __be32 *p; + u32 len; + + if (xdr_stream_decode_u32(xdr, &len) < 0) + return false; + if (len > NFS_MAXFHSIZE) + return false; + + p = xdr_inline_decode(xdr, len); + if (!p) + return false; + fh->size = len; + memcpy(fh->data, p, len); + memset(fh->data + len, 0, sizeof(fh->data) - len); + + return true; +} + /* * Encode and decode owner handle */ @@ -135,6 +161,39 @@ nlm4_decode_lock(__be32 *p, struct nlm_lock *lock) return p; } +static bool +svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock) +{ + struct file_lock *fl = &lock->fl; + u64 len, start; + s64 end; + + if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len)) + return false; + if (!svcxdr_decode_fhandle(xdr, &lock->fh)) + return false; + if (!svcxdr_decode_owner(xdr, &lock->oh)) + return false; + if (xdr_stream_decode_u32(xdr, &lock->svid) < 0) + return false; + if (xdr_stream_decode_u64(xdr, &start) < 0) + return false; + if (xdr_stream_decode_u64(xdr, &len) < 0) + return false; + + locks_init_lock(fl); + fl->fl_flags = FL_POSIX; + fl->fl_type = F_RDLCK; + end = start + len - 1; + fl->fl_start = s64_to_loff_t(start); + if (len == 0 || end < 0) + fl->fl_end = OFFSET_MAX; + else + fl->fl_end = s64_to_loff_t(end); + + return true; +} + /* * Encode result of a TEST/TEST_MSG call */ @@ -189,19 +248,20 @@ nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p) int nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p) { + struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nlm_args *argp = rqstp->rq_argp; - u32 exclusive; + u32 exclusive; - if (!(p = nlm4_decode_cookie(p, &argp->cookie))) + if (!svcxdr_decode_cookie(xdr, &argp->cookie)) return 0; - - exclusive = ntohl(*p++); - if (!(p = nlm4_decode_lock(p, &argp->lock))) + if (xdr_stream_decode_bool(xdr, &exclusive) < 0) + return 0; + if (!svcxdr_decode_lock(xdr, &argp->lock)) return 0; if (exclusive) argp->lock.fl.fl_type = F_WRLCK; - return xdr_argsize_check(rqstp, p); + return 1; } int