mirror of
https://github.com/linux-apfs/apfstests.git
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zhangyi (F)
11cf6e7a4a
chattr with [iap..] attributes open file for read-only and invoke ioctl(). If we chattr a lower file in overlay, it will get the lower file but not trigger copy-up, so ioctl() lead to modification of that lower file incorrectly. Add this test for this case. Signed-off-by: zhangyi (F) <yi.zhang@huawei.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Eryu Guan <eguan@redhat.com>
86 lines
2.2 KiB
Bash
Executable File
86 lines
2.2 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test 040
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#
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# chattr with [iap..] attributes open file for read-only and
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# invoke ioctl(). If we chattr a lower file in overlay, it
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# will get the lower file but not trigger copy-up, so ioctl()
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# lead to modification of that lower file.
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#
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# Upstream Commit 7c6893e3c9ab ("ovl: don't allow writing
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# ioctl on lower layer") return EPERM for this case to avoid
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# this issue.
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2017 Huawei. All Rights Reserved.
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# Author: zhangyi (F) <yi.zhang@huawei.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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$CHATTR_PROG -i $lowerdir/foo
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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 $seqres.full
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# real QA test starts here
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_supported_fs overlay
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_supported_os Linux
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_require_scratch
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_require_chattr i
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# remove all files from previous runs
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_scratch_mkfs
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# prepare lower test file
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lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
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mkdir -p $lowerdir
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touch $lowerdir/foo
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# mounting overlay
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_scratch_mount
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# Try to add immutable attributes in overlay, it will
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# open file for read-only and invoke ioctl(), it should not
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# modify lower origin file.
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$CHATTR_PROG +i $SCRATCH_MNT/foo > /dev/null 2>&1
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$UMOUNT_PROG $SCRATCH_MNT
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# touching origin file in lower, should succeed
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touch $lowerdir/foo
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# success, all done
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echo "Silence is golden"
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status=0
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exit
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