From nobody Fri Oct 24 20:13:46 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F001CC00140 for ; Mon, 15 Aug 2022 23:33:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345398AbiHOXdU (ORCPT ); Mon, 15 Aug 2022 19:33:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43804 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345396AbiHOX0s (ORCPT ); Mon, 15 Aug 2022 19:26:48 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E32A80F52; Mon, 15 Aug 2022 13:06:55 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 50894B810C5; Mon, 15 Aug 2022 20:06:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 87050C433C1; Mon, 15 Aug 2022 20:06:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660594012; bh=RhHLeYGdNEDcEC9n0pCBwyvJaJEEUECb9tN9lvLQVCc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=INXs3dCRb7zt6q6uqj3RJ1sBsmpDebeYyWHUebY/YsDJV4Ggbjtg4mDG05w5fg8aF UeYwjqwTpuLxAcase/evdp3+jGP2IHOJgs9C0QCGOUrjighLCujK8twFMTfpu9ffZ4 1WG+uQh+X4qNZyhzFh+3+F/jFRglr9sMsaCFxkwg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mikulas Patocka , Mike Snitzer , Sasha Levin Subject: [PATCH 5.18 1042/1095] dm raid: fix address sanitizer warning in raid_status Date: Mon, 15 Aug 2022 20:07:21 +0200 Message-Id: <20220815180512.194205458@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180429.240518113@linuxfoundation.org> References: <20220815180429.240518113@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Mikulas Patocka [ Upstream commit 1fbeea217d8f297fe0e0956a1516d14ba97d0396 ] There is this warning when using a kernel with the address sanitizer and running this testsuite: https://gitlab.com/cki-project/kernel-tests/-/tree/main/storage/swraid/scsi= _raid =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D BUG: KASAN: slab-out-of-bounds in raid_status+0x1747/0x2820 [dm_raid] Read of size 4 at addr ffff888079d2c7e8 by task lvcreate/13319 CPU: 0 PID: 13319 Comm: lvcreate Not tainted 5.18.0-0.rc3. #1 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 Call Trace: dump_stack_lvl+0x6a/0x9c print_address_description.constprop.0+0x1f/0x1e0 print_report.cold+0x55/0x244 kasan_report+0xc9/0x100 raid_status+0x1747/0x2820 [dm_raid] dm_ima_measure_on_table_load+0x4b8/0xca0 [dm_mod] table_load+0x35c/0x630 [dm_mod] ctl_ioctl+0x411/0x630 [dm_mod] dm_ctl_ioctl+0xa/0x10 [dm_mod] __x64_sys_ioctl+0x12a/0x1a0 do_syscall_64+0x5b/0x80 The warning is caused by reading conf->max_nr_stripes in raid_status. The code in raid_status reads mddev->private, casts it to struct r5conf and reads the entry max_nr_stripes. However, if we have different raid type than 4/5/6, mddev->private doesn't point to struct r5conf; it may point to struct r0conf, struct r1conf, struct r10conf or struct mpconf. If we cast a pointer to one of these structs to struct r5conf, we will be reading invalid memory and KASAN warns about it. Fix this bug by reading struct r5conf only if raid type is 4, 5 or 6. Cc: stable@vger.kernel.org Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer Signed-off-by: Sasha Levin --- drivers/md/dm-raid.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index e362a7471512..92e6b731f9d6 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -3514,7 +3514,7 @@ static void raid_status(struct dm_target *ti, status_= type_t type, { struct raid_set *rs =3D ti->private; struct mddev *mddev =3D &rs->md; - struct r5conf *conf =3D mddev->private; + struct r5conf *conf =3D rs_is_raid456(rs) ? mddev->private : NULL; int i, max_nr_stripes =3D conf ? conf->max_nr_stripes : 0; unsigned long recovery; unsigned int raid_param_cnt =3D 1; /* at least 1 for chunksize */ --=20 2.35.1