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>
151 lines
3.8 KiB
Bash
Executable File
151 lines
3.8 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Test case for support of JSON filenames
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#
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# Copyright (C) 2014 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 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=mreitz@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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_cleanup()
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{
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_cleanup_test_img
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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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_supported_fmt qcow2
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_supported_proto file
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# Because anything other than 16 would change the output of qemu_io -c info
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_unsupported_imgopts 'refcount_bits=\([^1]\|.\([^6]\|$\)\)'
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# Using an image filename containing quotation marks will render the JSON data
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# below invalid. In that case, we have little choice but simply not to run this
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# test.
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case $TEST_IMG in
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*'"'*)
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_notrun "image filename may not contain quotation marks"
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;;
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esac
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IMG_SIZE=64M
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# Taken from test 072
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echo
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echo "=== Testing nested image formats ==="
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echo
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TEST_IMG="$TEST_IMG.base" _make_test_img $IMG_SIZE
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$QEMU_IO -c 'write -P 42 0 512' -c 'write -P 23 512 512' \
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-c 'write -P 66 1024 512' "$TEST_IMG.base" | _filter_qemu_io
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$QEMU_IMG convert -f raw -O $IMGFMT "$TEST_IMG.base" "$TEST_IMG"
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$QEMU_IO_PROG --cache $CACHEMODE --aio $AIOMODE \
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-c 'read -P 42 0 512' -c 'read -P 23 512 512' \
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-c 'read -P 66 1024 512' "json:{
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\"driver\": \"$IMGFMT\",
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\"file\": {
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\"driver\": \"$IMGFMT\",
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\"file\": {
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\"filename\": \"$TEST_IMG\"
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}
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}
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}" | _filter_qemu_io
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# This should fail (see test 072)
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$QEMU_IO -c 'read -P 42 0 512' "$TEST_IMG" | _filter_qemu_io
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echo
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echo "=== Testing correct handling of 'backing':null ==="
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echo
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_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $IMG_SIZE
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# This should read 42
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$QEMU_IO -c 'read -P 42 0 512' "$TEST_IMG" | _filter_qemu_io
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# This should read 0
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$QEMU_IO -c 'read -P 0 0 512' "json:{\
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'driver': '$IMGFMT',
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'file': {
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'driver': 'file',
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'filename': '$TEST_IMG'
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},
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'backing': null
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}" | _filter_qemu_io
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# Taken from test 071
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echo
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echo "=== Testing blkdebug ==="
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echo
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_make_test_img $IMG_SIZE
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$QEMU_IO -c 'write -P 42 0x38000 512' "$TEST_IMG" | _filter_qemu_io
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# The "image.filename" part tests whether "a": { "b": "c" } and "a.b": "c" do
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# the same (which they should).
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$QEMU_IO_PROG --cache $CACHEMODE --aio $AIOMODE \
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-c 'read -P 42 0x38000 512' "json:{
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\"driver\": \"$IMGFMT\",
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\"file\": {
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\"driver\": \"blkdebug\",
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\"inject-error\": [{
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\"event\": \"l2_load\"
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}],
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\"image.filename\": \"$TEST_IMG\"
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}
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}" | _filter_qemu_io
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echo
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echo "=== Testing qemu-img info output ==="
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echo
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TEST_IMG="json:{\"driver\":\"qcow2\",\"file.filename\":\"$TEST_IMG\"}" _img_info
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echo
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echo "=== Testing option merging ==="
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echo
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# Both options given directly and those given in the filename should be used
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$QEMU_IO -c "open -o driver=qcow2 json:{\"file.filename\":\"$TEST_IMG\"}" \
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-c "info" 2>&1 | _filter_img_info
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# Options given directly should be prioritized over those given in the filename
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$QEMU_IO -c "open -o driver=qcow2 json:{\"driver\":\"raw\",\"file.filename\":\"$TEST_IMG\"}" \
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-c "info" 2>&1 | _filter_img_info
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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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