From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 7E0CC30568F; Wed, 19 Aug 2026 15:51:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787154683; cv=none; b=eyPfqEAFz2vvJp1sAzyuKmbhF+BPcA3J0AkO7ieRYv6DuUsEMZwk1W7OEJi9NTJAb4X1gnOqXjb0hrFgmO92i7MERl1NcrifDZWm4ZXxqAzvbA89h7j0639JSTASrsaIhgO2pP3MBIvGAS6cpsAPfppQapdTrZUTLV5UlV2ffQ4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787154683; c=relaxed/simple; bh=GGuETV83MBbaFtYqIK1RNgZq4/HyHflgym0Ph+0nYYY=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=cGIGmeHb9uOcxkbuYXBAywphgdr9fQ/8qtXpV5QjZ5FLn0sHqzRF9p7bd5hnnv5IHGjrQPUG9xdk/920zKWcz2X5NFaxAXeIivrIn3nAVlFRpnpdkO+arx5qyREJrod+Tb7AoAD/Cs3+l6xtdn/GaD9Ojy4Ri7sBCBS+h2H3Yoo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fEhfBwYO; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fEhfBwYO" Received: by smtp.kernel.org (Postfix) with UTF8SMTPSA id 14C421F00A3A; Wed, 19 Aug 2026 15:51:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787154682; bh=McnwuHHwJjOMlBvZ6VxOixglYZWnNcfL9Dde7+su5GE=; h=Date:From:To:Cc:Subject; b=fEhfBwYOqBbXJyqyua/ZMiyD47haHpPar7BSkP2GUEyJjV2RnNvc0N06dALP00onW 8LPp86FprD+/FyzQe+RLPFq+auxHmf4uFalWMpd4LE1HL29lYdVsdIHQnk2Ph310qu X+wRPj49atXGDvKfbkV2APceBp7OL3EyVlS7xyJwkmcPrqW5311lc+3Zyl7hNNbCAm Pec7d3ILi/7NEL8NgvNIJ1QPfcJp2uqQl0GAjMXlkAqc2OcdDjVkOKGmnKVGbr8d/+ iIBtRnylEFEw+/nu6d+8szTapwNd971CTGQJ14+CBEU/978DY7pgTxz5vf71V7cd7Y nlYxGKVi+W6wQ== Date: Wed, 19 Aug 2026 08:51:21 -0700 From: "Darrick J. Wong" To: Zorro Lang Cc: fstests , xfs , ljp1205831794@gmail.com Subject: [PATCH] xfs: test reflux with exchange-range Message-ID: <20260819155121.GA839663@frogsfrogsfrogs> Precedence: bulk X-Mailing-List: fstests@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline From: Darrick J. Wong Regression test for the XFS_IOC_EXCHRANGE flag INO1_WRITTEN clearing reflink flags when that shouldn't happen. Signed-off-by: "Darrick J. Wong" --- tests/generic/1957 | 72 ++++++++++++++++++++++++++++++++++++++++++++++++ tests/generic/1957.out | 16 +++++++++++ 2 files changed, 88 insertions(+) create mode 100755 tests/generic/1957 create mode 100644 tests/generic/1957.out diff --git a/tests/generic/1957 b/tests/generic/1957 new file mode 100755 index 00000000000000..bb039771970d15 --- /dev/null +++ b/tests/generic/1957 @@ -0,0 +1,72 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2026 Oracle. All Rights Reserved. +# +# FS QA Test No. 1957 +# +# Regression test for refluxfs, which is an exploit for a race condition in +# XFS' directio copy-on-write code that can be used to rewrite shared blocks +# to gain root privileges. +# +. ./common/preamble +_begin_fstest auto quick fiexchange + +_cleanup() +{ + cd / + rm -r -f $tmp.* + test -n "$dummydir" && rm -r -f "$dummydir" +} + +. ./common/filter +. ./common/reflink + +_require_scratch_reflink +_require_xfs_io_command exchangerange +_require_cp_reflink + +_fixed_by_fs_commit xfs XXXXXXXXXXXXXX \ + "xfs: fix exchange-range reflink flag clearing issue with INO1_WRITTEN" + +_scratch_mkfs >> $seqres.full +_scratch_mount + +# Create file1 as a fully written file, and file2 as a sparse file with one +# written area. +$XFS_IO_PROG -f -c "pwrite -S 0x58 0 1m" $SCRATCH_MNT/file1 >> $seqres.full +$XFS_IO_PROG -f -c "truncate 1m" -c "pwrite -S 0x59 64k 64k" $SCRATCH_MNT/file2 >> $seqres.full + +_scratch_unmount +_scratch_xfs_db -c "path /file1" -c 'print' -c "path /file2" -c 'print' | grep reflink +_scratch_mount + +# Reflink file1 so that the reflink flag gets set +_cp_reflink $SCRATCH_MNT/file1 $SCRATCH_MNT/fileC + +md5sum $SCRATCH_MNT/file1 $SCRATCH_MNT/file2 $SCRATCH_MNT/fileC | _filter_scratch + +# Exchange the written parts of file2 with file1, but only file1 has the +# reflink flag set. +$XFS_IO_PROG -c "exchangerange -w $SCRATCH_MNT/file2" $SCRATCH_MNT/file1 >> $seqres.full + +# Check reflink flags +_scratch_unmount +_scratch_xfs_db -c "path /file1" -c 'print' -c "path /file2" -c 'print' | grep reflink +_scratch_mount + +# Record content and layout +md5sum $SCRATCH_MNT/file1 $SCRATCH_MNT/file2 $SCRATCH_MNT/fileC | _filter_scratch +$XFS_IO_PROG -c 'bmap -vvvvvvvv' $SCRATCH_MNT/file[12C] >> $seqres.full + +# Write a single byte to file1, does that get echoed in fileC? +$XFS_IO_PROG -c 'pwrite -S 0x59 0 1' $SCRATCH_MNT/file1 >> $seqres.full +# +# Check reflink flags +_scratch_unmount +_scratch_xfs_db -c "path /file1" -c 'print' -c "path /file2" -c 'print' | grep reflink +_scratch_mount + +md5sum $SCRATCH_MNT/file1 $SCRATCH_MNT/file2 $SCRATCH_MNT/fileC | _filter_scratch +$XFS_IO_PROG -c 'bmap -vvvvvvvv' $SCRATCH_MNT/file[12C] >> $seqres.full + +_exit 0 diff --git a/tests/generic/1957.out b/tests/generic/1957.out new file mode 100644 index 00000000000000..7d64ea0e2c372d --- /dev/null +++ b/tests/generic/1957.out @@ -0,0 +1,16 @@ +QA output created by 1957 +v3.reflink = 0 +v3.reflink = 0 +310f146ce52077fcd3308dcbe7632bb2 SCRATCH_MNT/file1 +e6ee47dca6e786a44ae5b912be870d96 SCRATCH_MNT/file2 +310f146ce52077fcd3308dcbe7632bb2 SCRATCH_MNT/fileC +v3.reflink = 1 +v3.reflink = 1 +b630c7de58afd0ba5b8dfa24d701b5b8 SCRATCH_MNT/file1 +18cc9868973139a0bb558e09802a51b6 SCRATCH_MNT/file2 +310f146ce52077fcd3308dcbe7632bb2 SCRATCH_MNT/fileC +v3.reflink = 1 +v3.reflink = 1 +82b27c6f1b1de8fba44a911af80d9a7a SCRATCH_MNT/file1 +18cc9868973139a0bb558e09802a51b6 SCRATCH_MNT/file2 +310f146ce52077fcd3308dcbe7632bb2 SCRATCH_MNT/fileC