From owner-svn-src-stable@freebsd.org Wed Sep 23 01:56:22 2020 Return-Path: Delivered-To: svn-src-stable@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 091F33E8E47; Wed, 23 Sep 2020 01:56:22 +0000 (UTC) (envelope-from rmacklem@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Bx1Vs6T2Zz44tN; Wed, 23 Sep 2020 01:56:21 +0000 (UTC) (envelope-from rmacklem@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id C1ACC8FA8; Wed, 23 Sep 2020 01:56:21 +0000 (UTC) (envelope-from rmacklem@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 08N1uLK1085184; Wed, 23 Sep 2020 01:56:21 GMT (envelope-from rmacklem@FreeBSD.org) Received: (from rmacklem@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 08N1uLg7085183; Wed, 23 Sep 2020 01:56:21 GMT (envelope-from rmacklem@FreeBSD.org) Message-Id: <202009230156.08N1uLg7085183@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: rmacklem set sender to rmacklem@FreeBSD.org using -f From: Rick Macklem Date: Wed, 23 Sep 2020 01:56:21 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r366052 - stable/11/sys/fs/nfsserver X-SVN-Group: stable-11 X-SVN-Commit-Author: rmacklem X-SVN-Commit-Paths: stable/11/sys/fs/nfsserver X-SVN-Commit-Revision: 366052 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Sep 2020 01:56:22 -0000 Author: rmacklem Date: Wed Sep 23 01:56:21 2020 New Revision: 366052 URL: https://svnweb.freebsd.org/changeset/base/366052 Log: MFC: r365789 Fix a LOR between the NFS server and server side krpc. Recent testing of the NFS-over-TLS code found a LOR between the mutex lock used for sessions and the sleep lock used for server side krpc socket structures. The code in nfsrv_checksequence() would call SVC_RELEASE() with the mutex held. Normally this is ok, since all that happens is SVC_RELEASE() decrements a reference count. However, if the socket has just been shut down, SVC_RELEASE() drops the reference count to 0 and acquires a sleep lock during destruction of the server side krpc structure. This patch fixes the problem by moving the SVC_RELEASE() call in nfsrv_checksequence() down a few lines to below where the mutex is released. Modified: stable/11/sys/fs/nfsserver/nfs_nfsdstate.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/fs/nfsserver/nfs_nfsdstate.c ============================================================================== --- stable/11/sys/fs/nfsserver/nfs_nfsdstate.c Wed Sep 23 01:51:01 2020 (r366051) +++ stable/11/sys/fs/nfsserver/nfs_nfsdstate.c Wed Sep 23 01:56:21 2020 (r366052) @@ -6091,6 +6091,7 @@ nfsrv_checksequence(struct nfsrv_descript *nd, uint32_ * bound as well, do the implicit binding unless a * BindConnectiontoSession has already been done on the session. */ + savxprt = NULL; if (sep->sess_clp->lc_req.nr_client != NULL && sep->sess_cbsess.nfsess_xprt != nd->nd_xprt && (sep->sess_crflags & NFSV4CRSESS_CONNBACKCHAN) != 0 && @@ -6103,14 +6104,14 @@ nfsrv_checksequence(struct nfsrv_descript *nd, uint32_ sep->sess_clp->lc_req.nr_client->cl_private; nd->nd_xprt->xp_idletimeout = 0; /* Disable timeout. */ sep->sess_cbsess.nfsess_xprt = nd->nd_xprt; - if (savxprt != NULL) - SVC_RELEASE(savxprt); } *sflagsp = 0; if (sep->sess_clp->lc_req.nr_client == NULL) *sflagsp |= NFSV4SEQ_CBPATHDOWN; NFSUNLOCKSESSION(shp); + if (savxprt != NULL) + SVC_RELEASE(savxprt); if (error == NFSERR_EXPIRED) { *sflagsp |= NFSV4SEQ_EXPIREDALLSTATEREVOKED; error = 0;