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 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 5CA55C432C0 for ; Wed, 20 Nov 2019 15:41:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A69920709 for ; Wed, 20 Nov 2019 15:41:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731969AbfKTPkh (ORCPT ); Wed, 20 Nov 2019 10:40:37 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:52590 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729666AbfKTPkQ (ORCPT ); Wed, 20 Nov 2019 10:40:16 -0500 Received: from [167.98.27.226] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1iXS5T-0004aP-SN; Wed, 20 Nov 2019 15:40:11 +0000 Received: from ben by deadeye with local (Exim 4.93-RC1) (envelope-from ) id 1iXS5T-0004Gi-5B; Wed, 20 Nov 2019 15:40:11 +0000 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 , "Kees Cook" , "Jeffrin Jose T" , "Nick Desaulniers" , "Jens Axboe" Date: Wed, 20 Nov 2019 15:37:26 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 16/83] libata: zpodd: Fix small read overflow in zpodd_get_mech_type() In-Reply-To: X-SA-Exim-Connect-IP: 167.98.27.226 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 3.16.78-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Kees Cook commit 71d6c505b4d9e6f76586350450e785e3d452b346 upstream. Jeffrin reported a KASAN issue: BUG: KASAN: global-out-of-bounds in ata_exec_internal_sg+0x50f/0xc70 Read of size 16 at addr ffffffff91f41f80 by task scsi_eh_1/149 ... The buggy address belongs to the variable: cdb.48319+0x0/0x40 Much like commit 18c9a99bce2a ("libata: zpodd: small read overflow in eject_tray()"), this fixes a cdb[] buffer length, this time in zpodd_get_mech_type(): We read from the cdb[] buffer in ata_exec_internal_sg(). It has to be ATAPI_CDB_LEN (16) bytes long, but this buffer is only 12 bytes. Reported-by: Jeffrin Jose T Fixes: afe759511808c ("libata: identify and init ZPODD devices") Link: https://lore.kernel.org/lkml/201907181423.E808958@keescook/ Tested-by: Jeffrin Jose T Reviewed-by: Nick Desaulniers Signed-off-by: Kees Cook Signed-off-by: Jens Axboe Signed-off-by: Ben Hutchings --- drivers/ata/libata-zpodd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/ata/libata-zpodd.c +++ b/drivers/ata/libata-zpodd.c @@ -55,7 +55,7 @@ static enum odd_mech_type zpodd_get_mech unsigned int ret; struct rm_feature_desc *desc = (void *)(buf + 8); struct ata_taskfile tf; - static const char cdb[] = { GPCMD_GET_CONFIGURATION, + static const char cdb[ATAPI_CDB_LEN] = { GPCMD_GET_CONFIGURATION, 2, /* only 1 feature descriptor requested */ 0, 3, /* 3, removable medium feature */ 0, 0, 0,/* reserved */