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https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Darrick J. Wong
db8feee949
While active, the media backing a swap file is leased to the kernel. Userspace has no business writing to it. Make sure we can't do this. The two kernel patches titled as below should fix the bug: mm: set S_SWAPFILE on blockdev swap devices vfs: don't allow writes to swap files Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
57 lines
1.2 KiB
Bash
Executable File
57 lines
1.2 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0-or-newer
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# Copyright (c) 2019, Oracle and/or its affiliates. All Rights Reserved.
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#
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# FS QA Test No. 570
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#
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# Check that we can't modify a block device that's an active swap device.
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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cd /
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swapoff $SCRATCH_DEV
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rm -rf $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# real QA test starts here
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_supported_os Linux
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_supported_fs generic
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_require_test_program swapon
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_require_scratch_nocheck
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_require_block_device $SCRATCH_DEV
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rm -f $seqres.full
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$MKSWAP_PROG "$SCRATCH_DEV" >> $seqres.full
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# Can you modify the swap dev via previously open file descriptors?
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for verb in 1 2 3 4; do
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echo "verb $verb"
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"$here/src/swapon" -v $verb $SCRATCH_DEV
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swapoff $SCRATCH_DEV
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done
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swapon $SCRATCH_DEV 2>&1 | _filter_scratch
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# Can we write to it?
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$XFS_IO_PROG -c 'pwrite -S 0x59 64k 64k' $SCRATCH_DEV
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$XFS_IO_PROG -d -c 'pwrite -S 0x60 64k 64k' $SCRATCH_DEV
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$XFS_IO_PROG -c 'mmap -rw 64k 64k' -c 'mwrite -S 0x61 64k 64k' $SCRATCH_DEV
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# success, all done
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status=0
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exit
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