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,URIBL_BLOCKED,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 4D740C433FF for ; Fri, 2 Aug 2019 09:50:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 26F2F20679 for ; Fri, 2 Aug 2019 09:50:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564739457; bh=3rJFkMkaF6i6+N+CP0PMLPJyRCQ20v0GyX5nZVhhU28=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QnurJLqT2SW0pnBeLkyyatEWJ8XnLJKUW4TY7KZqrG0b6KaZhH5kNjpHpD3XxObct eVr++T8RdzkTU70ZcKN1yJQcSP2Nrne0qkA9fxhDH9Kd7ERk10RO0/PgM1ahkQoL1U Ek8DNSvJGNmfQCLLAsdANGV7NL+1ujP8gaMBxTVE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405414AbfHBJuv (ORCPT ); Fri, 2 Aug 2019 05:50:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:49042 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391477AbfHBJpT (ORCPT ); Fri, 2 Aug 2019 05:45:19 -0400 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 682782087E; Fri, 2 Aug 2019 09:45:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564739118; bh=3rJFkMkaF6i6+N+CP0PMLPJyRCQ20v0GyX5nZVhhU28=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=G5/O5LZhr8DI3kyUMypb2MFOY3WyXctE3UydQwgmVUaIyxwNKjhOB8P0/AavoIgvs 6UiLr8YmvX6OIRiHbvKR0LjM0cKYplybhVG7S7qoz+jxzhWqQwOJKqHFJzD0PkYW1Q vFj7F7iaKQnXeb6TwqN47mTF1fbpZe4b/NIpGWrc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Denis Efremov , Willy Tarreau , Linus Torvalds , Sasha Levin Subject: [PATCH 4.9 106/223] floppy: fix invalid pointer dereference in drive_name Date: Fri, 2 Aug 2019 11:35:31 +0200 Message-Id: <20190802092246.115916000@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190802092238.692035242@linuxfoundation.org> References: <20190802092238.692035242@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 [ Upstream commit 9b04609b784027968348796a18f601aed9db3789 ] This fixes the invalid pointer dereference in the drive_name function of the floppy driver. The native_format field of the struct floppy_drive_params is used as floppy_type array index in the drive_name function. Thus, the field should be checked the same way as the autodetect field. To trigger the bug, one could use a value out of range and set the drive parameters with the FDSETDRVPRM ioctl. Next, FDGETDRVTYP ioctl should be used to call the drive_name. A floppy disk is not required to be inserted. CAP_SYS_ADMIN is required to call FDSETDRVPRM. The patch adds the check for a value of the native_format field to be in the '0 <= x < ARRAY_SIZE(floppy_type)' range of the floppy_type array indices. The bug was found by syzkaller. Signed-off-by: Denis Efremov Tested-by: Willy Tarreau Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/block/floppy.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) --- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -3384,7 +3384,8 @@ static int fd_getgeo(struct block_device return 0; } -static bool valid_floppy_drive_params(const short autodetect[8]) +static bool valid_floppy_drive_params(const short autodetect[8], + int native_format) { size_t floppy_type_size = ARRAY_SIZE(floppy_type); size_t i = 0; @@ -3395,6 +3396,9 @@ static bool valid_floppy_drive_params(co return false; } + if (native_format < 0 || native_format >= floppy_type_size) + return false; + return true; } @@ -3524,7 +3528,8 @@ static int fd_locked_ioctl(struct block_ SUPBOUND(size, strlen((const char *)outparam) + 1); break; case FDSETDRVPRM: - if (!valid_floppy_drive_params(inparam.dp.autodetect)) + if (!valid_floppy_drive_params(inparam.dp.autodetect, + inparam.dp.native_format)) return -EINVAL; *UDP = inparam.dp; break; @@ -3723,7 +3728,7 @@ static int compat_setdrvprm(int drive, return -EPERM; if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params))) return -EFAULT; - if (!valid_floppy_drive_params(v.autodetect)) + if (!valid_floppy_drive_params(v.autodetect, v.native_format)) return -EINVAL; mutex_lock(&floppy_mutex); UDP->cmos = v.cmos;