From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A4495358D0A; Wed, 3 Dec 2025 16:20:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764778855; cv=none; b=d9SsVDnsxVn6t4t+9J/xUvtsxNBqtaiRInV0OHBFtpo0fi/feZmDq0EFdpiWyBWya2QSO8MFQbxMJoccA+zxg+mnhmvJVuhOW9jp8YKi9Ns5N7m56+eHglEoHiwQscnOQQDCCZkemcIOF1JGaV8FiK0PSieChCCsZRVC8eEsPAc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764778855; c=relaxed/simple; bh=MoV+pQX/ZKFRTd8oXlUtZ5/yZXYc+1l8MdNh9qEHQnM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WGA6av0fX5QK5z678GqSJ4IH4lOJgWpsGTzzd1c+1jdwdb//aVP2SG+hPuHhkDDF8UPDZpOMBLIJb8kWV3b6ISbWWanhJpe98nEiQM15Uy3fr2woFPvz9eT3N7gmSave9DzgcbmHocfWTmfsvbLW1GOexU7/U2jK3UI70FGjWbE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=yWxl+Pi0; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="yWxl+Pi0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8EB6EC4CEF5; Wed, 3 Dec 2025 16:20:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1764778855; bh=MoV+pQX/ZKFRTd8oXlUtZ5/yZXYc+1l8MdNh9qEHQnM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yWxl+Pi0HcrmFzvyB3yolWC8RXI1U2FojnNKSvepGx/8AyhnYwXPt/Hst55R6AZcz etTliewtGlUxnXWXFAquskG1jaDEKU8b+SF8lea+XMZaADP3eUQfGH0P9WToGtnzZp Qm4DpUEN0S+Lgum3ffpJxyGLThd8M2zS76MZbasc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Darrick J. Wong" , Christoph Hellwig , Luis Chamberlain , Shinichiro Kawasaki , Jens Axboe , Mahmoud Adam Subject: [PATCH 6.1 081/568] block: fix race between set_blocksize and read paths Date: Wed, 3 Dec 2025 16:21:23 +0100 Message-ID: <20251203152443.687366299@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251203152440.645416925@linuxfoundation.org> References: <20251203152440.645416925@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: "Darrick J. Wong" commit c0e473a0d226479e8e925d5ba93f751d8df628e9 upstream. With the new large sector size support, it's now the case that set_blocksize can change i_blksize and the folio order in a manner that conflicts with a concurrent reader and causes a kernel crash. Specifically, let's say that udev-worker calls libblkid to detect the labels on a block device. The read call can create an order-0 folio to read the first 4096 bytes from the disk. But then udev is preempted. Next, someone tries to mount an 8k-sectorsize filesystem from the same block device. The filesystem calls set_blksize, which sets i_blksize to 8192 and the minimum folio order to 1. Now udev resumes, still holding the order-0 folio it allocated. It then tries to schedule a read bio and do_mpage_readahead tries to create bufferheads for the folio. Unfortunately, blocks_per_folio == 0 because the page size is 4096 but the blocksize is 8192 so no bufferheads are attached and the bh walk never sets bdev. We then submit the bio with a NULL block device and crash. Therefore, truncate the page cache after flushing but before updating i_blksize. However, that's not enough -- we also need to lock out file IO and page faults during the update. Take both the i_rwsem and the invalidate_lock in exclusive mode for invalidations, and in shared mode for read/write operations. I don't know if this is the correct fix, but xfs/259 found it. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig Reviewed-by: Luis Chamberlain Tested-by: Shin'ichiro Kawasaki Link: https://lore.kernel.org/r/174543795699.4139148.2086129139322431423.stgit@frogsfrogsfrogs Signed-off-by: Jens Axboe [use bdev->bd_inode instead & fix small contextual changes] Signed-off-by: Mahmoud Adam Signed-off-by: Greg Kroah-Hartman --- block/bdev.c | 17 +++++++++++++++++ block/blk-zoned.c | 5 ++++- block/fops.c | 16 ++++++++++++++++ block/ioctl.c | 6 ++++++ 4 files changed, 43 insertions(+), 1 deletion(-) --- a/block/bdev.c +++ b/block/bdev.c @@ -147,9 +147,26 @@ int set_blocksize(struct block_device *b /* Don't change the size if it is same as current */ if (bdev->bd_inode->i_blkbits != blksize_bits(size)) { + /* + * Flush and truncate the pagecache before we reconfigure the + * mapping geometry because folio sizes are variable now. If a + * reader has already allocated a folio whose size is smaller + * than the new min_order but invokes readahead after the new + * min_order becomes visible, readahead will think there are + * "zero" blocks per folio and crash. Take the inode and + * invalidation locks to avoid racing with + * read/write/fallocate. + */ + inode_lock(bdev->bd_inode); + filemap_invalidate_lock(bdev->bd_inode->i_mapping); + sync_blockdev(bdev); + kill_bdev(bdev); + bdev->bd_inode->i_blkbits = blksize_bits(size); kill_bdev(bdev); + filemap_invalidate_unlock(bdev->bd_inode->i_mapping); + inode_unlock(bdev->bd_inode); } return 0; } --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -417,6 +417,7 @@ int blkdev_zone_mgmt_ioctl(struct block_ op = REQ_OP_ZONE_RESET; /* Invalidate the page cache, including dirty pages. */ + inode_lock(bdev->bd_inode); filemap_invalidate_lock(bdev->bd_inode->i_mapping); ret = blkdev_truncate_zone_range(bdev, mode, &zrange); if (ret) @@ -439,8 +440,10 @@ int blkdev_zone_mgmt_ioctl(struct block_ GFP_KERNEL); fail: - if (cmd == BLKRESETZONE) + if (cmd == BLKRESETZONE) { filemap_invalidate_unlock(bdev->bd_inode->i_mapping); + inode_unlock(bdev->bd_inode); + } return ret; } --- a/block/fops.c +++ b/block/fops.c @@ -592,7 +592,14 @@ static ssize_t blkdev_write_iter(struct ret = direct_write_fallback(iocb, from, ret, generic_perform_write(iocb, from)); } else { + /* + * Take i_rwsem and invalidate_lock to avoid racing with + * set_blocksize changing i_blkbits/folio order and punching + * out the pagecache. + */ + inode_lock_shared(bd_inode); ret = generic_perform_write(iocb, from); + inode_unlock_shared(bd_inode); } if (ret > 0) @@ -605,6 +612,7 @@ static ssize_t blkdev_write_iter(struct static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to) { struct block_device *bdev = iocb->ki_filp->private_data; + struct inode *bd_inode = bdev->bd_inode; loff_t size = bdev_nr_bytes(bdev); loff_t pos = iocb->ki_pos; size_t shorted = 0; @@ -652,7 +660,13 @@ static ssize_t blkdev_read_iter(struct k goto reexpand; } + /* + * Take i_rwsem and invalidate_lock to avoid racing with set_blocksize + * changing i_blkbits/folio order and punching out the pagecache. + */ + inode_lock_shared(bd_inode); ret = filemap_read(iocb, to, ret); + inode_unlock_shared(bd_inode); reexpand: if (unlikely(shorted)) @@ -695,6 +709,7 @@ static long blkdev_fallocate(struct file if ((start | len) & (bdev_logical_block_size(bdev) - 1)) return -EINVAL; + inode_lock(inode); filemap_invalidate_lock(inode->i_mapping); /* @@ -735,6 +750,7 @@ static long blkdev_fallocate(struct file fail: filemap_invalidate_unlock(inode->i_mapping); + inode_unlock(inode); return error; } --- a/block/ioctl.c +++ b/block/ioctl.c @@ -114,6 +114,7 @@ static int blk_ioctl_discard(struct bloc end > bdev_nr_bytes(bdev)) return -EINVAL; + inode_lock(inode); filemap_invalidate_lock(inode->i_mapping); err = truncate_bdev_range(bdev, mode, start, end - 1); if (err) @@ -121,6 +122,7 @@ static int blk_ioctl_discard(struct bloc err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); fail: filemap_invalidate_unlock(inode->i_mapping); + inode_unlock(inode); return err; } @@ -146,12 +148,14 @@ static int blk_ioctl_secure_erase(struct end > bdev_nr_bytes(bdev)) return -EINVAL; + inode_lock(bdev->bd_inode); filemap_invalidate_lock(bdev->bd_inode->i_mapping); err = truncate_bdev_range(bdev, mode, start, end - 1); if (!err) err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9, GFP_KERNEL); filemap_invalidate_unlock(bdev->bd_inode->i_mapping); + inode_unlock(bdev->bd_inode); return err; } @@ -184,6 +188,7 @@ static int blk_ioctl_zeroout(struct bloc return -EINVAL; /* Invalidate the page cache, including dirty pages */ + inode_lock(inode); filemap_invalidate_lock(inode->i_mapping); err = truncate_bdev_range(bdev, mode, start, end); if (err) @@ -194,6 +199,7 @@ static int blk_ioctl_zeroout(struct bloc fail: filemap_invalidate_unlock(inode->i_mapping); + inode_unlock(inode); return err; }