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>
311 lines
9 KiB
Plaintext
311 lines
9 KiB
Plaintext
QA output created by 273
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
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Formatting 'TEST_DIR/t.IMGFMT.mid', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.mid backing_fmt=IMGFMT
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Testing: -blockdev file,node-name=base,filename=TEST_DIR/t.IMGFMT.base -blockdev file,node-name=midf,filename=TEST_DIR/t.IMGFMT.mid -blockdev {"driver":"IMGFMT","node-name":"mid","file":"midf","backing":null} -blockdev file,node-name=topf,filename=TEST_DIR/t.IMGFMT -blockdev {"driver":"IMGFMT","file":"topf","node-name":"top","backing":null}
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{
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QMP_VERSION
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}
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{
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"return": {
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}
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}
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{
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"return": {
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}
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}
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{
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"return": {
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}
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}
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{
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"return": [
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{
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"iops_rd": 0,
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"detect_zeroes": "off",
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"image": {
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"backing-image": {
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"backing-image": {
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"virtual-size": 197120,
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"filename": "TEST_DIR/t.IMGFMT.base",
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"format": "file",
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"actual-size": SIZE,
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"dirty-flag": false
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},
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"backing-filename-format": "file",
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"virtual-size": 67108864,
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"filename": "TEST_DIR/t.IMGFMT.mid",
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"cluster-size": 65536,
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"format": "IMGFMT",
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"actual-size": SIZE,
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"full-backing-filename": "TEST_DIR/t.IMGFMT.base",
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"backing-filename": "TEST_DIR/t.IMGFMT.base",
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"dirty-flag": false
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},
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"backing-filename-format": "IMGFMT",
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"virtual-size": 67108864,
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"filename": "TEST_DIR/t.IMGFMT",
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"cluster-size": 65536,
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"format": "IMGFMT",
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"actual-size": SIZE,
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"full-backing-filename": "TEST_DIR/t.IMGFMT.mid",
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"backing-filename": "TEST_DIR/t.IMGFMT.mid",
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"dirty-flag": false
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},
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"iops_wr": 0,
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"ro": false,
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"node-name": "top",
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"backing_file_depth": 2,
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"drv": "IMGFMT",
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"iops": 0,
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"bps_wr": 0,
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"write_threshold": 0,
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"backing_file": "TEST_DIR/t.IMGFMT.mid",
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"encrypted": false,
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"bps": 0,
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"bps_rd": 0,
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"cache": {
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"no-flush": false,
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"direct": false,
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"writeback": true
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},
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"file": "TEST_DIR/t.IMGFMT",
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"encryption_key_missing": false
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},
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{
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"iops_rd": 0,
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"detect_zeroes": "off",
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"image": {
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"virtual-size": 197120,
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"filename": "TEST_DIR/t.IMGFMT",
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"format": "file",
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"actual-size": SIZE,
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"dirty-flag": false
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},
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"iops_wr": 0,
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"ro": false,
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"node-name": "topf",
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"backing_file_depth": 0,
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"drv": "file",
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"iops": 0,
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"bps_wr": 0,
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"write_threshold": 0,
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"encrypted": false,
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"bps": 0,
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"bps_rd": 0,
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"cache": {
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"no-flush": false,
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"direct": false,
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"writeback": true
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},
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"file": "TEST_DIR/t.IMGFMT",
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"encryption_key_missing": false
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},
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{
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"iops_rd": 0,
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"detect_zeroes": "off",
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"image": {
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"backing-image": {
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"virtual-size": 197120,
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"filename": "TEST_DIR/t.IMGFMT.base",
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"format": "file",
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"actual-size": SIZE,
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"dirty-flag": false
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},
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"backing-filename-format": "file",
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"virtual-size": 67108864,
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"filename": "TEST_DIR/t.IMGFMT.mid",
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"cluster-size": 65536,
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"format": "IMGFMT",
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"actual-size": SIZE,
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"full-backing-filename": "TEST_DIR/t.IMGFMT.base",
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"backing-filename": "TEST_DIR/t.IMGFMT.base",
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"dirty-flag": false
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},
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"iops_wr": 0,
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"ro": true,
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"node-name": "mid",
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"backing_file_depth": 1,
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"drv": "IMGFMT",
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"iops": 0,
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"bps_wr": 0,
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"write_threshold": 0,
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"backing_file": "TEST_DIR/t.IMGFMT.base",
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"encrypted": false,
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"bps": 0,
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"bps_rd": 0,
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"cache": {
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"no-flush": false,
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"direct": false,
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"writeback": true
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},
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"file": "TEST_DIR/t.IMGFMT.mid",
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"encryption_key_missing": false
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},
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{
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"iops_rd": 0,
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"detect_zeroes": "off",
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"image": {
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"virtual-size": 197120,
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"filename": "TEST_DIR/t.IMGFMT.mid",
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"format": "file",
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"actual-size": SIZE,
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"dirty-flag": false
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},
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"iops_wr": 0,
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"ro": false,
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"node-name": "midf",
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"backing_file_depth": 0,
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"drv": "file",
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"iops": 0,
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"bps_wr": 0,
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"write_threshold": 0,
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"encrypted": false,
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"bps": 0,
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"bps_rd": 0,
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"cache": {
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"no-flush": false,
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"direct": false,
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"writeback": true
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},
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"file": "TEST_DIR/t.IMGFMT.mid",
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"encryption_key_missing": false
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},
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{
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"iops_rd": 0,
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"detect_zeroes": "off",
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"image": {
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"virtual-size": 197120,
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"filename": "TEST_DIR/t.IMGFMT.base",
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"format": "file",
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"actual-size": SIZE,
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"dirty-flag": false
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},
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"iops_wr": 0,
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"ro": true,
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"node-name": "base",
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"backing_file_depth": 0,
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"drv": "file",
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"iops": 0,
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"bps_wr": 0,
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"write_threshold": 0,
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"encrypted": false,
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"bps": 0,
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"bps_rd": 0,
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"cache": {
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"no-flush": false,
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"direct": false,
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"writeback": true
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},
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"file": "TEST_DIR/t.IMGFMT.base",
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"encryption_key_missing": false
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}
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]
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}
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{
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"return": {
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"edges": [
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{
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"name": "file",
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"parent": 5,
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"shared-perm": [
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"graph-mod",
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"write-unchanged",
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"consistent-read"
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],
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"perm": [
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"resize",
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"write",
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"consistent-read"
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],
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"child": 4
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},
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{
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"name": "backing",
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"parent": 5,
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"shared-perm": [
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"graph-mod",
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"resize",
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"write-unchanged",
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"write",
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"consistent-read"
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],
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"perm": [
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],
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"child": 3
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},
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{
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"name": "file",
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"parent": 3,
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"shared-perm": [
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"graph-mod",
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"write-unchanged",
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"consistent-read"
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],
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"perm": [
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"consistent-read"
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],
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"child": 2
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},
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{
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"name": "backing",
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"parent": 3,
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"shared-perm": [
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"graph-mod",
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"resize",
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"write-unchanged",
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"write",
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"consistent-read"
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],
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"perm": [
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],
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"child": 1
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}
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],
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"nodes": [
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{
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"name": "top",
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"type": "block-driver",
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"id": 5
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},
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{
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"name": "topf",
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"type": "block-driver",
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"id": 4
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},
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{
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"name": "mid",
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"type": "block-driver",
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"id": 3
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},
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{
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"name": "midf",
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"type": "block-driver",
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"id": 2
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},
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{
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"name": "base",
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"type": "block-driver",
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"id": 1
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}
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]
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}
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}
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{
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"return": {
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}
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}
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{
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"timestamp": {
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"seconds": TIMESTAMP,
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"microseconds": TIMESTAMP
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},
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"event": "SHUTDOWN",
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"data": {
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"guest": false,
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"reason": "host-qmp-quit"
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}
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}
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*** done
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