From owner-svn-src-all@freebsd.org Fri Dec 20 16:20:38 2019 Return-Path: Delivered-To: svn-src-all@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 E770F1DD610; Fri, 20 Dec 2019 16:20:38 +0000 (UTC) (envelope-from kevans@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 47fYrQ5t7pz47Fg; Fri, 20 Dec 2019 16:20:38 +0000 (UTC) (envelope-from kevans@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 C51BD14A0; Fri, 20 Dec 2019 16:20:38 +0000 (UTC) (envelope-from kevans@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id xBKGKccX014688; Fri, 20 Dec 2019 16:20:38 GMT (envelope-from kevans@FreeBSD.org) Received: (from kevans@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id xBKGKciY014687; Fri, 20 Dec 2019 16:20:38 GMT (envelope-from kevans@FreeBSD.org) Message-Id: <201912201620.xBKGKciY014687@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kevans set sender to kevans@FreeBSD.org using -f From: Kyle Evans Date: Fri, 20 Dec 2019 16:20:38 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r355935 - head/sys/dev/vt X-SVN-Group: head X-SVN-Commit-Author: kevans X-SVN-Commit-Paths: head/sys/dev/vt X-SVN-Commit-Revision: 355935 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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: Fri, 20 Dec 2019 16:20:39 -0000 Author: kevans Date: Fri Dec 20 16:20:38 2019 New Revision: 355935 URL: https://svnweb.freebsd.org/changeset/base/355935 Log: vt: fix post-boot keyboard attachment With absolutely no keyboards attached and no kbdmux in kernel, we descend down this error path. 0 is a valid keyboard index, so leaving vd->vd_keyboard at 0 when there's no keyboard found is objectively wrong as later attachment of a keyboard will fail -- it gets index 0, and vt thinks it's already using that keyboard. This is decidedly the corniest of corner cases, but it's easy enough to get correct that we should do so. Tested in a kernel without atkbdc, atkbd, psm, kbdmux, ukbd, hyperv then loading ukbd post-boot and attaching a usb keyboard. Modified: head/sys/dev/vt/vt_core.c Modified: head/sys/dev/vt/vt_core.c ============================================================================== --- head/sys/dev/vt/vt_core.c Fri Dec 20 16:05:29 2019 (r355934) +++ head/sys/dev/vt/vt_core.c Fri Dec 20 16:20:38 2019 (r355935) @@ -1039,6 +1039,13 @@ vt_allocate_keyboard(struct vt_device *vd) DPRINTF(20, "%s: no kbdmux allocated\n", __func__); idx0 = kbd_allocate("*", -1, vd, vt_kbdevent, vd); if (idx0 < 0) { + /* + * We don't have a keyboard yet, so we must invalidate + * vd->vd_keyboard so that later keyboard attachment can + * succeed. Any value >= 0 can accidentally match a + * keyboard. + */ + vd->vd_keyboard = -1; DPRINTF(10, "%s: No keyboard found.\n", __func__); return (-1); }