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https://github.com/linux-apfs/apfstests.git
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Darrick J. Wong
a860a167d8
fstests only supports Linux, so get rid of this unnecessary predicate. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
65 lines
1.7 KiB
Bash
Executable File
65 lines
1.7 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2017 Oracle, Inc. All Rights Reserved.
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#
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# FSQA Test No. ext4/040 (was shared/005)
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#
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# Since loff_t is a signed type, it is invalid for a filesystem to load
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# an inode with i_size = -1ULL. Unfortunately, nobody checks this,
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# which means that we can trivially DoS the VFS by creating such a file
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# and appending to it. This causes an integer overflow in the routines
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# underlying writeback, which results in the kernel locking up.
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#
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# So, create this malformed inode and try a buffered append to make
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# sure we catch this situation.
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#
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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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PIDS=""
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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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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# real QA test starts here
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_supported_fs ext2 ext3 ext4
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_require_scratch_nocheck
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_disable_dmesg_check
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_require_command "$DEBUGFS_PROG"
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rm -f $seqres.full
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echo "Format and mount"
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_scratch_mkfs >> $seqres.full 2>&1
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_scratch_mount
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testdir=$SCRATCH_MNT
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echo m > $testdir/a
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echo "Corrupt filesystem"
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_scratch_unmount
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$DEBUGFS_PROG -w -R "sif /a size -1" $SCRATCH_DEV >> $seqres.full 2>&1
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# check whether debugfs succeeds to set i_size to -1 or not
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$DEBUGFS_PROG -R "stat /a" $SCRATCH_DEV 2>&1 | grep -q "Size: 18446744073709551615" || \
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_notrun "Could not set i_size to -1 successfully, skip test."
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echo "Remount, try to append"
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_scratch_mount
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dd if=/dev/zero of=$testdir/a bs=512 count=1 oflag=append conv=notrunc >> $seqres.full 2>&1 || echo "Write did not succeed (ok)."
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sync
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# success, all done
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status=0
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exit
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