87 lines
2.4 KiB
Bash
87 lines
2.4 KiB
Bash
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#!/bin/bash
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#
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# Copyright (c) 2018 Red Hat, Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will 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, see <http://www.gnu.org/licenses/>.
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#
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# Author: Boyang Xue <bxue@redhat.com>
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PACKAGE=kernel
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. /usr/share/beakerlib/beakerlib.sh
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rlJournalStart
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WDIR=/tmp/TC_freeze-protection-bypass.tmp.workdir
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ODIR=/tmp/TC_freeze-protection-bypass.tmp.oldmnt
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NDIR=/tmp/TC_freeze-protection-bypass.tmp.newmnt
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mkdir $ODIR $NDIR $WDIR
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cd $WDIR
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fallocate -l 64M 64M.img
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mkfs.ext4 -qF 64M.img
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TDEV=$(losetup -f --show 64M.img)
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TRID=$RANDOM
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rlPhaseStartSetup
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# The following patch for this bug is integrated in kernel v4.18
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#
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# vfs: add the sb_start_intwrite_trylock() helper
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# ext4: factor out helper ext4_sample_last_mounted()
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# ext4: do not update s_last_mounted of a frozen fs
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KNVR=$(uname -r | cut -d '-' -f1)
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rlCmpVersion $KNVR 4.18.0 >/dev/null
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if [[ $? -eq 2 ]]; then
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ISFIXED=0
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rlPass "Kernel version < 4.18, indicating it's vulnerable to this bug. Test skipped as pass."
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exit 0
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else
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ISFIXED=1
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fi
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rlRun "mount $TDEV $ODIR"
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rlRun "echo TC_freeze-protection-bypass > $ODIR/TC_freeze-protection-bypass"
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rlRun "umount $ODIR"
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rlPhaseEnd
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rlPhaseStartTest
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rlRun "echo \"run TC_freeze-protection-bypass#${TRID}\" >/dev/kmsg"
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rlRun "mount $TDEV $NDIR"
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rlLog "Run 'fsfreeze -f $NDIR &'"
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fsfreeze -f $NDIR &
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wait $!
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rlRun "grep TC_freeze-protection-bypass $NDIR/TC_freeze-protection-bypass"
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rlRun "! dmesg | tac | sed -ne \"0,\#run TC_freeze-protection-bypass\#${TRID}#p\" | tac | grep -E \"ext4_journal_check_start|ext4_journal_start_sb\""
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if [[ $? -eq 0 ]]; then
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rlPass "The kernel warning isn't triggered. Test passes."
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else
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rlFail "The kernel warning is triggered. Test fails."
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fi
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rlPhaseEnd
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rlPhaseStartCleanup
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rlRun "fsfreeze -u $NDIR"
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rlRun "umount $TDEV"
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rlRun "losetup -d $TDEV"
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rlRun "rm -f 64M.img"
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rlRun "rm -rf $NDIR"
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rlRun "rm -rf $ODIR"
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rlRun "rm -rf $WDIR"
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rlPhaseEnd
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rlJournalPrintText
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rlJournalEnd
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