From owner-svn-src-all@freebsd.org Sat Jan 5 15:28:21 2019 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 C1970149E7AF; Sat, 5 Jan 2019 15:28:21 +0000 (UTC) (envelope-from markj@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) server-signature RSA-PSS (4096 bits) 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 45E3786FC0; Sat, 5 Jan 2019 15:28:21 +0000 (UTC) (envelope-from markj@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 38CD11A737; Sat, 5 Jan 2019 15:28:21 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x05FSLr2032770; Sat, 5 Jan 2019 15:28:21 GMT (envelope-from markj@FreeBSD.org) Received: (from markj@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x05FSLRx032769; Sat, 5 Jan 2019 15:28:21 GMT (envelope-from markj@FreeBSD.org) Message-Id: <201901051528.x05FSLRx032769@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: markj set sender to markj@FreeBSD.org using -f From: Mark Johnston Date: Sat, 5 Jan 2019 15:28:21 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r342787 - head/sys/dev/tws X-SVN-Group: head X-SVN-Commit-Author: markj X-SVN-Commit-Paths: head/sys/dev/tws X-SVN-Commit-Revision: 342787 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 45E3786FC0 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.97 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.998,0]; NEURAL_HAM_LONG(-1.00)[-0.999,0]; NEURAL_HAM_SHORT(-0.97)[-0.970,0] 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: Sat, 05 Jan 2019 15:28:21 -0000 Author: markj Date: Sat Jan 5 15:28:20 2019 New Revision: 342787 URL: https://svnweb.freebsd.org/changeset/base/342787 Log: Add a bounds check to the tws(4) passthrough ioctl handler. tws_passthru() was doing a copyin of a user-specified request without validating its length, so a malicious request could overrun the buffer. By default, the tws(4) device file is only accessible as root. admbug: 825 Reported by: Anonymous of the Shellphish Grill Team Reviewed by: delphij MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D18536 Modified: head/sys/dev/tws/tws_user.c Modified: head/sys/dev/tws/tws_user.c ============================================================================== --- head/sys/dev/tws/tws_user.c Sat Jan 5 15:09:50 2019 (r342786) +++ head/sys/dev/tws/tws_user.c Sat Jan 5 15:28:20 2019 (r342787) @@ -92,9 +92,13 @@ tws_passthru(struct tws_softc *sc, void *buf) struct tws_request *req; struct tws_ioctl_no_data_buf *ubuf = (struct tws_ioctl_no_data_buf *)buf; int error; + u_int32_t buffer_length; u_int16_t lun4; - + buffer_length = roundup2(ubuf->driver_pkt.buffer_length, 512); + if ( buffer_length > TWS_MAX_IO_SIZE ) { + return(EINVAL); + } if ( tws_get_state(sc) != TWS_ONLINE) { return(EBUSY); } @@ -118,7 +122,7 @@ tws_passthru(struct tws_softc *sc, void *buf) } } while(1); - req->length = (ubuf->driver_pkt.buffer_length + 511) & ~511; + req->length = buffer_length; TWS_TRACE_DEBUG(sc, "datal,rid", req->length, req->request_id); if ( req->length ) { req->data = sc->ioctl_data_mem;