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>
67 lines
4.3 KiB
Plaintext
67 lines
4.3 KiB
Plaintext
QA output created by 156
|
|
Formatting 'TEST_DIR/t.IMGFMT.backing', fmt=IMGFMT size=1048576
|
|
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576 backing_file=TEST_DIR/t.IMGFMT.backing backing_fmt=IMGFMT
|
|
wrote 262144/262144 bytes at offset 0
|
|
256 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
wrote 196608/196608 bytes at offset 65536
|
|
192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
{ 'execute': 'qmp_capabilities' }
|
|
{"return": {}}
|
|
Formatting 'TEST_DIR/t.IMGFMT.overlay', fmt=IMGFMT size=1048576 backing_file=TEST_DIR/t.IMGFMT backing_fmt=IMGFMT
|
|
{ 'execute': 'blockdev-snapshot-sync', 'arguments': { 'device': 'source', 'snapshot-file': 'TEST_DIR/t.IMGFMT.overlay', 'format': 'IMGFMT', 'mode': 'existing' } }
|
|
{"return": {}}
|
|
{ 'execute': 'human-monitor-command', 'arguments': { 'command-line': 'qemu-io source "write -P 3 128k 128k"' } }
|
|
wrote 131072/131072 bytes at offset 131072
|
|
128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
{"return": ""}
|
|
Formatting 'TEST_DIR/t.IMGFMT.target.overlay', fmt=IMGFMT size=1048576 backing_file=TEST_DIR/t.IMGFMT.target backing_fmt=IMGFMT
|
|
{ 'execute': 'drive-mirror', 'arguments': { 'device': 'source', 'target': 'TEST_DIR/t.IMGFMT.target.overlay', 'mode': 'existing', 'sync': 'top' } }
|
|
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "created", "id": "source"}}
|
|
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "running", "id": "source"}}
|
|
{"return": {}}
|
|
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "source"}}
|
|
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "BLOCK_JOB_READY", "data": {"device": "source", "len": 131072, "offset": 131072, "speed": 0, "type": "mirror"}}
|
|
{ 'execute': 'human-monitor-command', 'arguments': { 'command-line': 'qemu-io source "write -P 4 192k 64k"' } }
|
|
wrote 65536/65536 bytes at offset 196608
|
|
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
{"return": ""}
|
|
{ 'execute': 'block-job-complete', 'arguments': { 'device': 'source' } }
|
|
{"return": {}}
|
|
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "waiting", "id": "source"}}
|
|
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "pending", "id": "source"}}
|
|
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "BLOCK_JOB_COMPLETED", "data": {"device": "source", "len": 196608, "offset": 196608, "speed": 0, "type": "mirror"}}
|
|
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "concluded", "id": "source"}}
|
|
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "null", "id": "source"}}
|
|
|
|
{ 'execute': 'human-monitor-command', 'arguments': { 'command-line': 'qemu-io source "read -P 1 0k 64k"' } }
|
|
read 65536/65536 bytes at offset 0
|
|
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
{"return": ""}
|
|
{ 'execute': 'human-monitor-command', 'arguments': { 'command-line': 'qemu-io source "read -P 2 64k 64k"' } }
|
|
read 65536/65536 bytes at offset 65536
|
|
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
{"return": ""}
|
|
{ 'execute': 'human-monitor-command', 'arguments': { 'command-line': 'qemu-io source "read -P 3 128k 64k"' } }
|
|
read 65536/65536 bytes at offset 131072
|
|
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
{"return": ""}
|
|
{ 'execute': 'human-monitor-command', 'arguments': { 'command-line': 'qemu-io source "read -P 4 192k 64k"' } }
|
|
read 65536/65536 bytes at offset 196608
|
|
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
{"return": ""}
|
|
|
|
{ 'execute': 'quit' }
|
|
{"return": {}}
|
|
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
|
|
|
|
read 65536/65536 bytes at offset 0
|
|
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
read 65536/65536 bytes at offset 65536
|
|
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
read 65536/65536 bytes at offset 131072
|
|
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
read 65536/65536 bytes at offset 196608
|
|
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
|
|
|
|
*** done
|