From owner-svn-src-stable-12@freebsd.org Mon Aug 24 16:27:52 2020 Return-Path: Delivered-To: svn-src-stable-12@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 190873C6BA9; Mon, 24 Aug 2020 16:27:52 +0000 (UTC) (envelope-from trasz@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 4BZyGH6gNHz3bwV; Mon, 24 Aug 2020 16:27:51 +0000 (UTC) (envelope-from trasz@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 C7F741B5A5; Mon, 24 Aug 2020 16:27:51 +0000 (UTC) (envelope-from trasz@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 07OGRpXt074736; Mon, 24 Aug 2020 16:27:51 GMT (envelope-from trasz@FreeBSD.org) Received: (from trasz@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 07OGRpJr074735; Mon, 24 Aug 2020 16:27:51 GMT (envelope-from trasz@FreeBSD.org) Message-Id: <202008241627.07OGRpJr074735@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: trasz set sender to trasz@FreeBSD.org using -f From: Edward Tomasz Napierala Date: Mon, 24 Aug 2020 16:27:51 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r364707 - stable/12/sys/compat/linux X-SVN-Group: stable-12 X-SVN-Commit-Author: trasz X-SVN-Commit-Paths: stable/12/sys/compat/linux X-SVN-Commit-Revision: 364707 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-12@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Aug 2020 16:27:52 -0000 Author: trasz Date: Mon Aug 24 16:27:51 2020 New Revision: 364707 URL: https://svnweb.freebsd.org/changeset/base/364707 Log: MFC r362941: Fix Linux recvmsg(2) when msg_namelen returned is 0. Previously it would fail with EINVAL, breaking some of the Python regression tests. While here, cap the user-controlled message length. Note that the code doesn't seem to be copying out the new length in either (success or failure) case. This will be addressed separately. Sponsored by: The FreeBSD Foundation Modified: stable/12/sys/compat/linux/linux_socket.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/compat/linux/linux_socket.c ============================================================================== --- stable/12/sys/compat/linux/linux_socket.c Mon Aug 24 16:25:27 2020 (r364706) +++ stable/12/sys/compat/linux/linux_socket.c Mon Aug 24 16:27:51 2020 (r364707) @@ -1195,11 +1195,14 @@ linux_recvmsg_common(struct thread *td, l_int s, struc if (error != 0) return (error); - if (msg->msg_name) { + if (msg->msg_name != NULL && msg->msg_namelen > 0) { + msg->msg_namelen = min(msg->msg_namelen, SOCK_MAXADDRLEN); sa = malloc(msg->msg_namelen, M_SONAME, M_WAITOK); msg->msg_name = sa; - } else + } else { sa = NULL; + msg->msg_name = NULL; + } uiov = msg->msg_iov; msg->msg_iov = iov; @@ -1209,7 +1212,10 @@ linux_recvmsg_common(struct thread *td, l_int s, struc if (error != 0) goto bad; - if (msg->msg_name) { + /* + * Note that kern_recvit() updates msg->msg_namelen. + */ + if (msg->msg_name != NULL && msg->msg_namelen > 0) { msg->msg_name = PTRIN(linux_msghdr.msg_name); error = bsd_to_linux_sockaddr(sa, &lsa, msg->msg_namelen); if (error == 0)