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qemu-e2k/tests/qemu-iotests/153
Eric Blake b66ff2c298 iotests: Specify explicit backing format where sensible 
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>
2020-07-14 15:18:59 +02:00

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#!/usr/bin/env bash
#
# Test image locking
#
# Copyright 2016, 2017 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# creator
owner=famz@redhat.com
seq="$(basename $0)"
echo "QA output created by $seq"
tmp=/tmp/$$
status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
for img in "${TEST_IMG}".{base,overlay,convert,a,b,c,lnk}; do
_rm_test_img "$img"
done
}
trap "_cleanup; exit \$status" 0 1 2 3 15
# get standard environment, filters and checks
. ./common.rc
. ./common.filter
. ./common.qemu
size=32M
_check_ofd()
{
_make_test_img $size >/dev/null
if $QEMU_IMG_PROG info --image-opts "driver=file,locking=on,filename=$TEST_IMG" 2>&1 |
grep -q 'falling back to POSIX file'; then
return 1
else
return 0
fi
}
_check_ofd || _notrun "OFD lock not available"
_supported_fmt qcow2
_supported_proto file
_run_cmd()
{
echo
(echo "$@"; "$@" 2>&1 1>/dev/null) | _filter_testdir
}
_do_run_qemu()
{
(
if ! test -t 0; then
while read cmd; do
echo $cmd
done
fi
echo quit
) | $QEMU -nographic -monitor stdio -serial none "$@" 1>/dev/null
}
_run_qemu_with_images()
{
_do_run_qemu \
$(for i in $@; do echo "-drive if=none,file=$i"; done) 2>&1 \
| _filter_testdir | _filter_qemu
}
echo "== readonly=off,force-share=on should be rejected =="
_run_qemu_with_images null-co://,readonly=off,force-share=on
for opts1 in "" "read-only=on" "read-only=on,force-share=on"; do
echo
echo "== Creating base image =="
TEST_IMG="${TEST_IMG}.base" _make_test_img $size
echo
echo "== Creating test image =="
_make_test_img -b "${TEST_IMG}.base" -F $IMGFMT
echo
echo "== Launching QEMU, opts: '$opts1' =="
_launch_qemu -drive file="${TEST_IMG}",if=none,$opts1
h=$QEMU_HANDLE
for opts2 in "" "read-only=on" "read-only=on,force-share=on"; do
echo
echo "== Launching another QEMU, opts: '$opts2' =="
echo "quit" | \
$QEMU -nographic -monitor stdio \
-drive file="${TEST_IMG}",if=none,$opts2 2>&1 1>/dev/null | \
_filter_testdir | _filter_qemu
done
for L in "" "-U"; do
echo
echo "== Running utility commands $L =="
_run_cmd $QEMU_IO $L -c "read 0 512" "${TEST_IMG}"
_run_cmd $QEMU_IO $L -r -c "read 0 512" "${TEST_IMG}"
_run_cmd $QEMU_IO -c "open $L ${TEST_IMG}" -c "read 0 512"
_run_cmd $QEMU_IO -c "open -r $L ${TEST_IMG}" -c "read 0 512"
_run_cmd $QEMU_IMG info $L "${TEST_IMG}"
_run_cmd $QEMU_IMG check $L "${TEST_IMG}"
_run_cmd $QEMU_IMG compare $L "${TEST_IMG}" "${TEST_IMG}"
_run_cmd $QEMU_IMG map $L "${TEST_IMG}"
_run_cmd $QEMU_IMG amend -o "size=$size" $L "${TEST_IMG}"
_run_cmd $QEMU_IMG commit $L "${TEST_IMG}"
_run_cmd $QEMU_IMG resize $L "${TEST_IMG}" $size
_run_cmd $QEMU_IMG rebase $L "${TEST_IMG}" -b "${TEST_IMG}.base" -F $IMGFMT
_run_cmd $QEMU_IMG snapshot -l $L "${TEST_IMG}"
_run_cmd $QEMU_IMG convert $L "${TEST_IMG}" "${TEST_IMG}.convert"
_run_cmd $QEMU_IMG dd $L if="${TEST_IMG}" of="${TEST_IMG}.convert" bs=512 count=1
_run_cmd $QEMU_IMG bench $L -c 1 "${TEST_IMG}"
_run_cmd $QEMU_IMG bench $L -w -c 1 "${TEST_IMG}"
# qemu-img create does not support -U
if [ -z "$L" ]; then
_run_cmd $QEMU_IMG create -f $IMGFMT "${TEST_IMG}" \
-b ${TEST_IMG}.base -F $IMGFMT
# Read the file format. It used to be the case that
# file-posix simply truncated the file, but the qcow2
# driver then failed to format it because it was unable
# to acquire the necessary WRITE permission. However, the
# truncation was already wrong, and the whole process
# resulted in the file being completely empty and thus its
# format would be detected to be raw.
# So we read it here to see that creation either completed
# successfully (thus the format is qcow2) or it aborted
# before the file was changed at all (thus the format stays
# qcow2).
_img_info -U | grep 'file format'
fi
done
_send_qemu_cmd $h "{ 'execute': 'quit' }" ''
echo
echo "Round done"
_cleanup_qemu
done
test_opts="read-only=off read-only=on read-only=on,force-share=on"
for opt1 in $test_opts; do
for opt2 in $test_opts; do
echo
echo "== Two devices with the same image ($opt1 - $opt2) =="
_run_qemu_with_images "${TEST_IMG},$opt1" "${TEST_IMG},$opt2"
done
done
echo
echo "== Creating ${TEST_IMG}.[abc] ==" | _filter_testdir
$QEMU_IMG create -f qcow2 "${TEST_IMG}.a" -b "${TEST_IMG}" -F $IMGFMT | _filter_img_create
$QEMU_IMG create -f qcow2 "${TEST_IMG}.b" -b "${TEST_IMG}" -F $IMGFMT | _filter_img_create
$QEMU_IMG create -f qcow2 "${TEST_IMG}.c" -b "${TEST_IMG}.b" -F $IMGFMT \
| _filter_img_create
echo
echo "== Two devices sharing the same file in backing chain =="
_run_qemu_with_images "${TEST_IMG}.a" "${TEST_IMG}.b"
_run_qemu_with_images "${TEST_IMG}.a" "${TEST_IMG}.c"
echo
echo "== Backing image also as an active device =="
_run_qemu_with_images "${TEST_IMG}.a" "${TEST_IMG}"
echo
echo "== Backing image also as an active device (ro) =="
_run_qemu_with_images "${TEST_IMG}.a" "${TEST_IMG},readonly=on"
echo
echo "== Symbolic link =="
rm -f "${TEST_IMG}.lnk" &>/dev/null
ln -s ${TEST_IMG} "${TEST_IMG}.lnk" || echo "Failed to create link"
_run_qemu_with_images "${TEST_IMG}.lnk" "${TEST_IMG}"
echo
echo "== Active commit to intermediate layer should work when base in use =="
_launch_qemu -drive format=$IMGFMT,file="${TEST_IMG}.a",id=drive0,if=none \
-device virtio-blk,drive=drive0
_send_qemu_cmd $QEMU_HANDLE \
"{ 'execute': 'qmp_capabilities' }" \
'return'
_run_cmd $QEMU_IMG commit -b "${TEST_IMG}.b" "${TEST_IMG}.c"
_cleanup_qemu
_launch_qemu
_send_qemu_cmd $QEMU_HANDLE \
"{ 'execute': 'qmp_capabilities' }" \
'return'
echo "Adding drive"
_send_qemu_cmd $QEMU_HANDLE \
"{ 'execute': 'human-monitor-command',
'arguments': { 'command-line': 'drive_add 0 if=none,id=d0,file=${TEST_IMG}' } }" \
'return'
_run_cmd $QEMU_IO "${TEST_IMG}" -c 'write 0 512'
echo "Creating overlay with qemu-img when the guest is running should be allowed"
_run_cmd $QEMU_IMG create -f $IMGFMT -b "${TEST_IMG}" -F $IMGFMT "${TEST_IMG}.overlay"
echo "== Closing an image should unlock it =="
_send_qemu_cmd $QEMU_HANDLE \
"{ 'execute': 'human-monitor-command',
'arguments': { 'command-line': 'drive_del d0' } }" \
'return'
_run_cmd $QEMU_IO "${TEST_IMG}" -c 'write 0 512'
echo "Adding two and closing one"
for d in d0 d1; do
_send_qemu_cmd $QEMU_HANDLE \
"{ 'execute': 'human-monitor-command',
'arguments': { 'command-line': 'drive_add 0 if=none,id=$d,file=${TEST_IMG},readonly=on' } }" \
'return'
done
_run_cmd $QEMU_IMG info "${TEST_IMG}"
_send_qemu_cmd $QEMU_HANDLE \
"{ 'execute': 'human-monitor-command',
'arguments': { 'command-line': 'drive_del d0' } }" \
'return'
_run_cmd $QEMU_IO "${TEST_IMG}" -c 'write 0 512'
echo "Closing the other"
_send_qemu_cmd $QEMU_HANDLE \
"{ 'execute': 'human-monitor-command',
'arguments': { 'command-line': 'drive_del d1' } }" \
'return'
_run_cmd $QEMU_IO "${TEST_IMG}" -c 'write 0 512'
_cleanup_qemu
echo
echo "== Detecting -U and force-share conflicts =="
echo
echo 'No conflict:'
$QEMU_IMG info -U --image-opts driver=null-co,force-share=on
echo
echo 'Conflict:'
$QEMU_IMG info -U --image-opts driver=null-co,force-share=off
echo
echo 'No conflict:'
$QEMU_IO -c 'open -r -U -o driver=null-co,force-share=on'
echo
echo 'Conflict:'
$QEMU_IO -c 'open -r -U -o driver=null-co,force-share=off'
# success, all done
echo "*** done"
rm -f $seq.full
status=0
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