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=ham 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 76E79C2D0DB for ; Wed, 22 Jan 2020 09:38:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4E5A12467F for ; Wed, 22 Jan 2020 09:38:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579685911; bh=i5fPU1cllSzTaPk4Z7mwMsA3fQcRdvAfVBYInl39Iwk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rWJ6NVomGvqdeiq7mui+n3Kn9xEbOh3dDHg7Fw+SM9hnR9qUX3D1IvCjjmj5JOB/m DaWoIz7Cc1UQKkh0xtWNAywlpFOStSdrUG0oWTREr/sQ8x3uzYIhRIZu5mL4MFXjv5 asn3Bre36Mjt6y78N4SCjk3ue10FQHyLaJBN5Mno= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733030AbgAVJi3 (ORCPT ); Wed, 22 Jan 2020 04:38:29 -0500 Received: from mail.kernel.org ([198.145.29.99]:55170 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732980AbgAVJiZ (ORCPT ); Wed, 22 Jan 2020 04:38:25 -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 F34912467B; Wed, 22 Jan 2020 09:38:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579685904; bh=i5fPU1cllSzTaPk4Z7mwMsA3fQcRdvAfVBYInl39Iwk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C9st4+xJ5ZLOIF6yGi48MNhO37Py9eVMacWFtNnoeA7wGcZ3vjfjUP4A0gweicZbW qEmJqK9hemn0fYsQzXTCGCMZoGdVUuUyMqzk81q/+gf67j2vq8FxQSsvNUeQQotZvX GXAa5JwHS4xsgd7CeNWMopFgQbn0ywtG/MopPROQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Martin K. Petersen" , Ming Lei , Mikulas Patocka , Jens Axboe Subject: [PATCH 4.14 06/65] block: fix an integer overflow in logical block size Date: Wed, 22 Jan 2020 10:28:51 +0100 Message-Id: <20200122092752.258862391@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200122092750.976732974@linuxfoundation.org> References: <20200122092750.976732974@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mikulas Patocka commit ad6bf88a6c19a39fb3b0045d78ea880325dfcf15 upstream. Logical block size has type unsigned short. That means that it can be at most 32768. However, there are architectures that can run with 64k pages (for example arm64) and on these architectures, it may be possible to create block devices with 64k block size. For exmaple (run this on an architecture with 64k pages): Mount will fail with this error because it tries to read the superblock using 2-sector access: device-mapper: writecache: I/O is not aligned, sector 2, size 1024, block size 65536 EXT4-fs (dm-0): unable to read superblock This patch changes the logical block size from unsigned short to unsigned int to avoid the overflow. Cc: stable@vger.kernel.org Reviewed-by: Martin K. Petersen Reviewed-by: Ming Lei Signed-off-by: Mikulas Patocka Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/blk-settings.c | 2 +- drivers/md/dm-snap-persistent.c | 2 +- drivers/md/raid0.c | 2 +- include/linux/blkdev.h | 8 ++++---- 4 files changed, 7 insertions(+), 7 deletions(-) --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -379,7 +379,7 @@ EXPORT_SYMBOL(blk_queue_max_segment_size * storage device can address. The default of 512 covers most * hardware. **/ -void blk_queue_logical_block_size(struct request_queue *q, unsigned short size) +void blk_queue_logical_block_size(struct request_queue *q, unsigned int size) { q->limits.logical_block_size = size; --- a/drivers/md/dm-snap-persistent.c +++ b/drivers/md/dm-snap-persistent.c @@ -17,7 +17,7 @@ #include "dm-bufio.h" #define DM_MSG_PREFIX "persistent snapshot" -#define DM_CHUNK_SIZE_DEFAULT_SECTORS 32 /* 16KB */ +#define DM_CHUNK_SIZE_DEFAULT_SECTORS 32U /* 16KB */ #define DM_PREFETCH_CHUNKS 12 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -94,7 +94,7 @@ static int create_strip_zones(struct mdd char b[BDEVNAME_SIZE]; char b2[BDEVNAME_SIZE]; struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL); - unsigned short blksize = 512; + unsigned blksize = 512; *private_conf = ERR_PTR(-ENOMEM); if (!conf) --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -343,6 +343,7 @@ struct queue_limits { unsigned int max_sectors; unsigned int max_segment_size; unsigned int physical_block_size; + unsigned int logical_block_size; unsigned int alignment_offset; unsigned int io_min; unsigned int io_opt; @@ -353,7 +354,6 @@ struct queue_limits { unsigned int discard_granularity; unsigned int discard_alignment; - unsigned short logical_block_size; unsigned short max_segments; unsigned short max_integrity_segments; unsigned short max_discard_segments; @@ -1178,7 +1178,7 @@ extern void blk_queue_max_write_same_sec unsigned int max_write_same_sectors); extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, unsigned int max_write_same_sectors); -extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); +extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); extern void blk_queue_alignment_offset(struct request_queue *q, unsigned int alignment); @@ -1436,7 +1436,7 @@ static inline unsigned int queue_max_seg return q->limits.max_segment_size; } -static inline unsigned short queue_logical_block_size(struct request_queue *q) +static inline unsigned queue_logical_block_size(struct request_queue *q) { int retval = 512; @@ -1446,7 +1446,7 @@ static inline unsigned short queue_logic return retval; } -static inline unsigned short bdev_logical_block_size(struct block_device *bdev) +static inline unsigned int bdev_logical_block_size(struct block_device *bdev) { return queue_logical_block_size(bdev_get_queue(bdev)); }