From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 74E36C55186 for ; Thu, 23 Apr 2020 23:15:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 58A6420780 for ; Thu, 23 Apr 2020 23:15:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729555AbgDWXPV (ORCPT ); Thu, 23 Apr 2020 19:15:21 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:49728 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728424AbgDWXGr (ORCPT ); Thu, 23 Apr 2020 19:06:47 -0400 Received: from [192.168.4.242] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1jRkvS-0004hX-3O; Fri, 24 Apr 2020 00:06:34 +0100 Received: from ben by deadeye with local (Exim 4.93) (envelope-from ) id 1jRkvP-00E6nz-QF; Fri, 24 Apr 2020 00:06:31 +0100 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, Denis Kirjanov , "Jiri Kosina" , "Benjamin Tissoires" , "Dmitry Torokhov" , syzbot+19340dff067c2d3835c0@syzkaller.appspotmail.com Date: Fri, 24 Apr 2020 00:05:39 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 112/245] HID: hid-input: clear unmapped usages In-Reply-To: X-SA-Exim-Connect-IP: 192.168.4.242 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.83-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Dmitry Torokhov commit 4f3882177240a1f55e45a3d241d3121341bead78 upstream. We should not be leaving half-mapped usages with potentially invalid keycodes, as that may confuse hidinput_find_key() when the key is located by index, which may end up feeding way too large keycode into the VT keyboard handler and cause OOB write there: BUG: KASAN: global-out-of-bounds in clear_bit include/asm-generic/bitops-instrumented.h:56 [inline] BUG: KASAN: global-out-of-bounds in kbd_keycode drivers/tty/vt/keyboard.c:1411 [inline] BUG: KASAN: global-out-of-bounds in kbd_event+0xe6b/0x3790 drivers/tty/vt/keyboard.c:1495 Write of size 8 at addr ffffffff89a1b2d8 by task syz-executor108/1722 ... kbd_keycode drivers/tty/vt/keyboard.c:1411 [inline] kbd_event+0xe6b/0x3790 drivers/tty/vt/keyboard.c:1495 input_to_handler+0x3b6/0x4c0 drivers/input/input.c:118 input_pass_values.part.0+0x2e3/0x720 drivers/input/input.c:145 input_pass_values drivers/input/input.c:949 [inline] input_set_keycode+0x290/0x320 drivers/input/input.c:954 evdev_handle_set_keycode_v2+0xc4/0x120 drivers/input/evdev.c:882 evdev_do_ioctl drivers/input/evdev.c:1150 [inline] Reported-by: syzbot+19340dff067c2d3835c0@syzkaller.appspotmail.com Signed-off-by: Dmitry Torokhov Tested-by: Benjamin Tissoires Signed-off-by: Jiri Kosina Signed-off-by: Ben Hutchings --- drivers/hid/hid-input.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) --- a/drivers/hid/hid-input.c +++ b/drivers/hid/hid-input.c @@ -947,9 +947,15 @@ static void hidinput_configure_usage(str } mapped: - if (device->driver->input_mapped && device->driver->input_mapped(device, - hidinput, field, usage, &bit, &max) < 0) - goto ignore; + if (device->driver->input_mapped && + device->driver->input_mapped(device, hidinput, field, usage, + &bit, &max) < 0) { + /* + * The driver indicated that no further generic handling + * of the usage is desired. + */ + return; + } set_bit(usage->type, input->evbit); @@ -1008,9 +1014,11 @@ mapped: set_bit(MSC_SCAN, input->mscbit); } -ignore: return; +ignore: + usage->type = 0; + usage->code = 0; } void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value)