mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Eric Sandeen
9343320e67
Regression test for kernel commit: 023cc840 xfs: handle array index overrun in xfs_dir2_leaf_readbuf() See commit for detailed problem description. tl;dr: readahead on weirdly fragmented multi-block directories was broken. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>
119 lines
3.4 KiB
Bash
Executable File
119 lines
3.4 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test 294
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#
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# Test readdir on fragmented multi-fsb dir blocks
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#
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# If the readahead map ends with a partial multi-fsb dir
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# block, the loop at the end of xfs_dir2_leaf_readbuf() may
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# walk off the end of the mapping array, read garbage,
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# corrupt the loop control counter, and never return.
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#
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# Failure is a hang; KASAN should also catch this.
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2017 Red Hat, Inc. All Rights Reserved.
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# Author: Eric Sandeen <sandeen@redhat.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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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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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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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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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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# Modify as appropriate.
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_supported_fs xfs
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_supported_os Linux
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_require_scratch
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_require_test_program "punch-alternating"
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# We want to mkfs with a very specific geometry
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MKFS_OPTIONS=""
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_scratch_mkfs "-d size=512m -n size=8192 -i size=1024" >> $seqres.full 2>&1 \
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|| _fail "mkfs failed"
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_scratch_mount
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# Make a ton of mostly-empty inode clusters so we can always
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# make more inodes
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mkdir $SCRATCH_MNT/tmp
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for I in `seq 1 10000`; do touch $SCRATCH_MNT/tmp/$I; done
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# These mostly-empty clusters will live here:
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mkdir $SCRATCH_MNT/clusters
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for I in `seq 1 32 10000`; do
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mv $SCRATCH_MNT/tmp/$I $SCRATCH_MNT/clusters;
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done
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rm -rf $SCRATCH_MNT/tmp
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# Make our test dir with a couple blocks, should be contiguous
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mkdir $SCRATCH_MNT/testdir
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# roughly 20 chars per file
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for I in `seq 1 100`; do
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touch $SCRATCH_MNT/testdir/12345678901234567890$I;
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done
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# Now completely fragment freespace.
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# Consume most of it:
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$XFS_IO_PROG -f -c "falloc 0 400m" $SCRATCH_MNT/fillfile ||
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_fail "Could not allocate space"
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# File to fragment:
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$XFS_IO_PROG -f -c "falloc 0 70m" $SCRATCH_MNT/fragfile ||
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_fail "Could not allocate space"
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df -h $SCRATCH_MNT >> $seqres.full 2>&1
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# Fill remaining space; let this run to failure
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dd if=/dev/zero of=$SCRATCH_MNT/spacefile1 oflag=direct >> $seqres.full 2>&1
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# Fragment our all-consuming file
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./src/punch-alternating $SCRATCH_MNT/fragfile >> $seqres.full 2>&1
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# Punching might have freed up large-ish swaths of metadata
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# Consume hopefully any remaining contiguous freespace
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# (and then some for good measure)
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dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64 >> $seqres.full 2>&1
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# Now populate the directory so that it must allocate these
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# fragmented blocks
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for I in `seq 1 1400`; do
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touch $SCRATCH_MNT/testdir/12345678901234567890$I;
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done
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# Now traverse that ugly thing!
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find $SCRATCH_MNT/testdir | sort | _filter_scratch | md5sum
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status=0
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exit
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