b66ff2c298
There are many existing qcow2 images that specify a backing file but no format. This has been the source of CVEs in the past, but has become more prominent of a problem now that libvirt has switched to -blockdev. With older -drive, at least the probing was always done by qemu (so the only risk of a changed format between successive boots of a guest was if qemu was upgraded and probed differently). But with newer -blockdev, libvirt must specify a format; if libvirt guesses raw where the image was formatted, this results in data corruption visible to the guest; conversely, if libvirt guesses qcow2 where qemu was using raw, this can result in potential security holes, so modern libvirt instead refuses to use images without explicit backing format. The change in libvirt to reject images without explicit backing format has pointed out that a number of tools have been far too reliant on probing in the past. It's time to set a better example in our own iotests of properly setting this parameter. iotest calls to create, rebase, and convert are all impacted to some degree. It's a bit annoying that we are inconsistent on command line - while all of those accept -o backing_file=...,backing_fmt=..., the shortcuts are different: create and rebase have -b and -F, while convert has -B but no -F. (amend has no shortcuts, but the previous patch just deprecated the use of amend to change backing chains). Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20200706203954.341758-9-eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
247 lines
6.6 KiB
Bash
Executable File
247 lines
6.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Live snapshot tests
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#
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# This tests live snapshots of images on a running QEMU instance, using
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# QMP commands. Both single disk snapshots, and transactional group
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# snapshots are performed.
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#
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# Copyright (C) 2014 Red Hat, Inc.
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# Copyright (C) 2015 Igalia, S.L.
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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 2 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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# creator
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owner=jcody@redhat.com
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seq=`basename $0`
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echo "QA output created by $seq"
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status=1 # failure is the default!
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snapshot_virt0="snapshot-v0.qcow2"
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snapshot_virt1="snapshot-v1.qcow2"
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SNAPSHOTS=10
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_cleanup()
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{
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_cleanup_qemu
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_cleanup_test_img
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for i in $(seq 1 ${SNAPSHOTS})
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do
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_rm_test_img "${TEST_DIR}/${i}-${snapshot_virt0}"
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_rm_test_img "${TEST_DIR}/${i}-${snapshot_virt1}"
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done
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for img in "${TEST_IMG}".{1,2,base}
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do
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_rm_test_img "$img"
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done
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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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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. ./common.qemu
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_supported_fmt qcow2
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_supported_proto file
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# ${1}: unique identifier for the snapshot filename
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create_single_snapshot()
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{
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cmd="{ 'execute': 'blockdev-snapshot-sync',
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'arguments': { 'device': 'virtio0',
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'snapshot-file':'${TEST_DIR}/${1}-${snapshot_virt0}',
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'format': 'qcow2' } }"
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_send_qemu_cmd $h "${cmd}" "return"
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}
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# ${1}: unique identifier for the snapshot filename
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create_group_snapshot()
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{
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cmd="{ 'execute': 'transaction', 'arguments':
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{'actions': [
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{ 'type': 'blockdev-snapshot-sync', 'data' :
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{ 'device': 'virtio0',
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'snapshot-file': '${TEST_DIR}/${1}-${snapshot_virt0}' } },
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{ 'type': 'blockdev-snapshot-sync', 'data' :
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{ 'device': 'virtio1',
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'snapshot-file': '${TEST_DIR}/${1}-${snapshot_virt1}' } } ]
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} }"
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_send_qemu_cmd $h "${cmd}" "return"
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}
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# ${1}: unique identifier for the snapshot filename
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# ${2}: extra_params to the blockdev-add command
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# ${3}: filename
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do_blockdev_add()
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{
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cmd="{ 'execute': 'blockdev-add', 'arguments':
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{ 'driver': 'qcow2', 'node-name': 'snap_${1}', ${2}
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'file':
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{ 'driver': 'file', 'filename': '${3}',
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'node-name': 'file_${1}' } } }"
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_send_qemu_cmd $h "${cmd}" "return"
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}
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# ${1}: unique identifier for the snapshot filename
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add_snapshot_image()
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{
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base_image="${TEST_DIR}/$((${1}-1))-${snapshot_virt0}"
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snapshot_file="${TEST_DIR}/${1}-${snapshot_virt0}"
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TEST_IMG=$snapshot_file _make_test_img -u -b "${base_image}" -F $IMGFMT "$size"
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do_blockdev_add "$1" "'backing': null, " "${snapshot_file}"
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}
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# ${1}: unique identifier for the snapshot filename
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# ${2}: expected response, defaults to 'return'
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blockdev_snapshot()
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{
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cmd="{ 'execute': 'blockdev-snapshot',
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'arguments': { 'node': 'virtio0',
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'overlay':'snap_${1}' } }"
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_send_qemu_cmd $h "${cmd}" "${2:-return}"
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}
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size=128M
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TEST_IMG="$TEST_IMG.1" _make_test_img $size
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TEST_IMG="$TEST_IMG.2" _make_test_img $size
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echo
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echo === Running QEMU ===
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echo
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qemu_comm_method="qmp"
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_launch_qemu -drive file="${TEST_IMG}.1",if=virtio -drive file="${TEST_IMG}.2",if=virtio
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h=$QEMU_HANDLE
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echo
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echo === Sending capabilities ===
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echo
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_send_qemu_cmd $h "{ 'execute': 'qmp_capabilities' }" "return"
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# Tests for the blockdev-snapshot-sync command
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echo
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echo === Create a single snapshot on virtio0 ===
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echo
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create_single_snapshot 1
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echo
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echo === Invalid command - missing device and nodename ===
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echo
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_send_qemu_cmd $h "{ 'execute': 'blockdev-snapshot-sync',
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'arguments': { 'snapshot-file':'${TEST_DIR}/1-${snapshot_virt0}',
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'format': 'qcow2' } }" "error"
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echo
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echo === Invalid command - missing snapshot-file ===
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echo
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_send_qemu_cmd $h "{ 'execute': 'blockdev-snapshot-sync',
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'arguments': { 'device': 'virtio0',
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'format': 'qcow2' } }" "error"
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echo
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echo
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echo === Create several transactional group snapshots ===
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echo
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for i in $(seq 2 ${SNAPSHOTS})
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do
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create_group_snapshot ${i}
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done
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# Tests for the blockdev-snapshot command
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echo
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echo === Create a couple of snapshots using blockdev-snapshot ===
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echo
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SNAPSHOTS=$((${SNAPSHOTS}+1))
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add_snapshot_image ${SNAPSHOTS}
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blockdev_snapshot ${SNAPSHOTS}
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SNAPSHOTS=$((${SNAPSHOTS}+1))
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add_snapshot_image ${SNAPSHOTS}
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blockdev_snapshot ${SNAPSHOTS}
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echo
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echo === Invalid command - cannot create a snapshot using a file BDS ===
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echo
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_send_qemu_cmd $h "{ 'execute': 'blockdev-snapshot',
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'arguments': { 'node':'virtio0',
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'overlay':'file_${SNAPSHOTS}' }
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}" "error"
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echo
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echo === Invalid command - snapshot node used as active layer ===
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echo
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blockdev_snapshot ${SNAPSHOTS} error
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_send_qemu_cmd $h "{ 'execute': 'blockdev-snapshot',
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'arguments': { 'node':'virtio0',
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'overlay':'virtio0' }
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}" "error"
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_send_qemu_cmd $h "{ 'execute': 'blockdev-snapshot',
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'arguments': { 'node':'virtio0',
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'overlay':'virtio1' }
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}" "error"
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echo
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echo === Invalid command - snapshot node used as backing hd ===
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echo
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blockdev_snapshot $((${SNAPSHOTS}-1)) error
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echo
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echo === Invalid command - snapshot node has a backing image ===
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echo
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SNAPSHOTS=$((${SNAPSHOTS}+1))
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TEST_IMG="$TEST_IMG.base" _make_test_img "$size"
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_make_test_img -b "${TEST_IMG}.base" -F $IMGFMT "$size"
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do_blockdev_add ${SNAPSHOTS} "" "${TEST_IMG}"
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blockdev_snapshot ${SNAPSHOTS} error
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echo
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echo === Invalid command - The node does not exist ===
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echo
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blockdev_snapshot $((${SNAPSHOTS}+1)) error
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_send_qemu_cmd $h "{ 'execute': 'blockdev-snapshot',
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'arguments': { 'node':'nodevice',
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'overlay':'snap_${SNAPSHOTS}' }
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}" "error"
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# success, all done
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echo "*** done"
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rm -f $seq.full
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status=0
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