From owner-svn-src-head@freebsd.org Mon Feb 11 07:42:33 2019 Return-Path: Delivered-To: svn-src-head@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 2F8E514EBDEE; Mon, 11 Feb 2019 07:42:33 +0000 (UTC) (envelope-from gonzo@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 C0C718827C; Mon, 11 Feb 2019 07:42:32 +0000 (UTC) (envelope-from gonzo@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 B264924C24; Mon, 11 Feb 2019 07:42:32 +0000 (UTC) (envelope-from gonzo@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x1B7gWVc091262; Mon, 11 Feb 2019 07:42:32 GMT (envelope-from gonzo@FreeBSD.org) Received: (from gonzo@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x1B7gW7b091261; Mon, 11 Feb 2019 07:42:32 GMT (envelope-from gonzo@FreeBSD.org) Message-Id: <201902110742.x1B7gW7b091261@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: gonzo set sender to gonzo@FreeBSD.org using -f From: Oleksandr Tymoshenko Date: Mon, 11 Feb 2019 07:42:32 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r343998 - head/sys/dev/beri/virtio X-SVN-Group: head X-SVN-Commit-Author: gonzo X-SVN-Commit-Paths: head/sys/dev/beri/virtio X-SVN-Commit-Revision: 343998 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: C0C718827C 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)[-0.997,0]; NEURAL_HAM_SHORT(-0.98)[-0.977,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Feb 2019 07:42:33 -0000 Author: gonzo Date: Mon Feb 11 07:42:32 2019 New Revision: 343998 URL: https://svnweb.freebsd.org/changeset/base/343998 Log: Fix off-by-one error in BERI virtio driver The hardcoded ident is exactly 20 bytes long but sprintf adds terminating zero, so there is one byte written out of array bounds.As a fix use strncpy it appends \0 only if space allows and its behavior matches virtio spec: When VIRTIO_BLK_T_GET_ID is issued, the device identifier, up to 20 bytes, is written to the buffer. The identifier should be interpreted as an ascii string. It is terminated with \0, unless it is exactly 20 bytes long. PR: 202298 Reviewed by: br MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D18852 Modified: head/sys/dev/beri/virtio/virtio_block.c Modified: head/sys/dev/beri/virtio/virtio_block.c ============================================================================== --- head/sys/dev/beri/virtio/virtio_block.c Mon Feb 11 07:09:02 2019 (r343997) +++ head/sys/dev/beri/virtio/virtio_block.c Mon Feb 11 07:42:32 2019 (r343998) @@ -187,7 +187,7 @@ vtblk_proc(struct beri_vtblk_softc *sc, struct vqueue_ break; case VIRTIO_BLK_T_GET_ID: /* Assume a single buffer */ - strlcpy(iov[1].iov_base, sc->ident, + strncpy(iov[1].iov_base, sc->ident, MIN(iov[1].iov_len, sizeof(sc->ident))); err = 0; break; @@ -401,7 +401,7 @@ backend_info(struct beri_vtblk_softc *sc) s+=1; } - sprintf(sc->ident, "Virtio block backend"); + strncpy(sc->ident, "Virtio block backend", sizeof(sc->ident)); return (0); }