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https://github.com/linux-apfs/apfstests.git
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76 lines
2.2 KiB
Bash
76 lines
2.2 KiB
Bash
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#! /bin/bash
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# FSQA Test No. 400
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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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#-----------------------------------------------------------------------
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# Copyright (c) 2017 Oracle, Inc. All Rights Reserved.
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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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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_os Linux
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_supported_fs xfs
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_require_scratch_nocheck
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_disable_dmesg_check
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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 > $testdir/a
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inum=$(stat -c "%i" $testdir/a)
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echo "Corrupt filesystem"
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_scratch_unmount
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_scratch_xfs_db -x -c "inode ${inum}" -c 'write core.size -- -1' >> $seqres.full
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echo "Remount, try to append"
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_scratch_mount
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dd if=/dev/zero of=$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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