From owner-svn-src-all@freebsd.org Tue Nov 20 01:59:58 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6C9F41136D11; Tue, 20 Nov 2018 01:59:58 +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 TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 0CAE47159B; Tue, 20 Nov 2018 01:59:58 +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 D6D302709; Tue, 20 Nov 2018 01:59:57 +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 wAK1xvHD028409; Tue, 20 Nov 2018 01:59:57 GMT (envelope-from rmacklem@FreeBSD.org) Received: (from rmacklem@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wAK1xvjj028408; Tue, 20 Nov 2018 01:59:57 GMT (envelope-from rmacklem@FreeBSD.org) Message-Id: <201811200159.wAK1xvjj028408@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: rmacklem set sender to rmacklem@FreeBSD.org using -f From: Rick Macklem Date: Tue, 20 Nov 2018 01:59:57 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r340663 - head/sys/fs/nfsserver X-SVN-Group: head X-SVN-Commit-Author: rmacklem X-SVN-Commit-Paths: head/sys/fs/nfsserver X-SVN-Commit-Revision: 340663 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 0CAE47159B X-Spamd-Result: default: False [0.52 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_SPAM_MEDIUM(0.02)[0.018,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_SPAM_SHORT(0.51)[0.507,0]; NEURAL_HAM_LONG(-0.00)[-0.003,0] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Nov 2018 01:59:58 -0000 Author: rmacklem Date: Tue Nov 20 01:59:57 2018 New Revision: 340663 URL: https://svnweb.freebsd.org/changeset/base/340663 Log: Improve sanity checking for the dircount hint argument to NFSv3's ReaddirPlus and NFSv4's Readdir operations. The code checked for a zero argument, but did not check for a very large value. This patch clips dircount at the server's maximum data size. MFC after: 1 week Modified: head/sys/fs/nfsserver/nfs_nfsdport.c Modified: head/sys/fs/nfsserver/nfs_nfsdport.c ============================================================================== --- head/sys/fs/nfsserver/nfs_nfsdport.c Tue Nov 20 01:56:34 2018 (r340662) +++ head/sys/fs/nfsserver/nfs_nfsdport.c Tue Nov 20 01:59:57 2018 (r340663) @@ -2107,9 +2107,15 @@ nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdg * cookie) should be in the reply. At least one client "hints" 0, * so I set it to cnt for that case. I also round it up to the * next multiple of DIRBLKSIZ. + * Since the size of a Readdirplus directory entry reply will always + * be greater than a directory entry returned by VOP_READDIR(), it + * does not make sense to read more than NFS_SRVMAXDATA() via + * VOP_READDIR(). */ if (siz <= 0) siz = cnt; + else if (siz > NFS_SRVMAXDATA(nd)) + siz = NFS_SRVMAXDATA(nd); siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1)); if (nd->nd_flag & ND_NFSV4) {