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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 83733C43603 for ; Thu, 19 Dec 2019 19:11:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 56AB2227BF for ; Thu, 19 Dec 2019 19:11:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576782716; bh=U4z2sRDYdJKHX1PNo+xR3U0qZN1owb1vJ9hDYEmbJF4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=OlQotLPlsXiKfiiM2YqGR+J66e2IMCO+04F74PPrZ1WnqDJw1Yhil0jD0TzFVZ8ls tBuZKsAGBWnubpdpA4jaSWmEGVbn5v3zK7do4NyWaSo64E8yo+Tj/6xy3xBh8lexQQ wwQsztsnEkFLFHVh04tJlcn05SaAiAqYlvLxOnXY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727840AbfLSShd (ORCPT ); Thu, 19 Dec 2019 13:37:33 -0500 Received: from mail.kernel.org ([198.145.29.99]:55226 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727492AbfLSShc (ORCPT ); Thu, 19 Dec 2019 13:37:32 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 77B4224679; Thu, 19 Dec 2019 18:37:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576780651; bh=U4z2sRDYdJKHX1PNo+xR3U0qZN1owb1vJ9hDYEmbJF4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ej1v8VLU3IRWn9lpGvZSRfD2PjGp8bowlzQJwjymcMc7AH2r6cvikj1QYy5nqEZKX kaGra04H1UFprDLDzmBT4CdEGlfG3FnYCy4578kobl/6XzGJsPAfve9qNGmrOugFAl jlGk+6vb8MtrzhTVk4r3hWKc15xTYPrGw5W1Jg4E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+19340dff067c2d3835c0@syzkaller.appspotmail.com, Dmitry Torokhov Subject: [PATCH 4.4 060/162] tty: vt: keyboard: reject invalid keycodes Date: Thu, 19 Dec 2019 19:32:48 +0100 Message-Id: <20191219183211.520428414@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191219183150.477687052@linuxfoundation.org> References: <20191219183150.477687052@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dmitry Torokhov commit b2b2dd71e0859436d4e05b2f61f86140250ed3f8 upstream. Do not try to handle keycodes that are too big, otherwise we risk doing out-of-bounds writes: 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] In this case we were dealing with a fuzzed HID device that declared over 12K buttons, and while HID layer should not be reporting to us such big keycodes, we should also be defensive and reject invalid data ourselves as well. Reported-by: syzbot+19340dff067c2d3835c0@syzkaller.appspotmail.com Signed-off-by: Dmitry Torokhov Cc: stable Link: https://lore.kernel.org/r/20191122204220.GA129459@dtor-ws Signed-off-by: Greg Kroah-Hartman --- drivers/tty/vt/keyboard.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/tty/vt/keyboard.c +++ b/drivers/tty/vt/keyboard.c @@ -1460,7 +1460,7 @@ static void kbd_event(struct input_handl if (event_type == EV_MSC && event_code == MSC_RAW && HW_RAW(handle->dev)) kbd_rawcode(value); - if (event_type == EV_KEY) + if (event_type == EV_KEY && event_code <= KEY_MAX) kbd_keycode(event_code, value, HW_RAW(handle->dev)); spin_unlock(&kbd_event_lock);