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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>
206 lines
6.4 KiB
Bash
Executable File
206 lines
6.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Rebasing COW images
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#
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# Copyright (C) 2009 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=kwolf@redhat.com
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seq=`basename $0`
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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_rm_test_img "$TEST_DIR/t.$IMGFMT.base_old"
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_rm_test_img "$TEST_DIR/t.$IMGFMT.base_new"
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_rm_test_img "$TEST_DIR/subdir/t.$IMGFMT"
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_rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.base_old"
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_rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.base_new"
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rmdir "$TEST_DIR/subdir" 2> /dev/null
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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.pattern
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# Currently only qcow2 and qed support rebasing
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_supported_fmt qcow2 qed
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_supported_proto file
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_supported_os Linux
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CLUSTER_SIZE=65536
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# Cluster allocations to be tested:
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#
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# Backing (old) 11 -- 11 -- 11 -- 11 --
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# Backing (new) 22 22 -- -- 22 22 -- --
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# COW image 33 33 33 33 -- -- -- --
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#
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# The pattern is written twice to have both an alloc -> non-alloc and a
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# non-alloc -> alloc transition in the COW image.
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echo "Creating backing file"
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echo
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TEST_IMG_SAVE="$TEST_IMG"
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TEST_IMG="$TEST_IMG.base_old"
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_make_test_img 1G
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io_pattern writev 0 $CLUSTER_SIZE $((2 * CLUSTER_SIZE)) 8 0x11
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TEST_IMG="$TEST_IMG_SAVE.base_new"
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echo "Creating new backing file"
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echo
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_make_test_img 1G
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io_pattern writev 0 $((2 * CLUSTER_SIZE)) $((4 * CLUSTER_SIZE)) 4 0x22
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TEST_IMG="$TEST_IMG_SAVE"
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echo "Creating COW image"
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echo
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_make_test_img -b "$TEST_IMG.base_old" -F $IMGFMT 1G
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io_pattern writev 0 $((4 * CLUSTER_SIZE)) 0 1 0x33
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io_pattern writev $((8 * CLUSTER_SIZE)) $((4 * CLUSTER_SIZE)) 0 1 0x33
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echo "Read before the rebase to make sure everything is set up correctly"
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echo
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io_pattern readv $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
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io_pattern readv $((5 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
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io_pattern readv $((6 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
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io_pattern readv $((7 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
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io_pattern readv $((8 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((9 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((10 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((11 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((12 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
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io_pattern readv $((13 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
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io_pattern readv $((14 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
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io_pattern readv $((15 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
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echo
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echo Rebase and test again
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echo
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$QEMU_IMG rebase -b "$TEST_IMG.base_new" -F $IMGFMT "$TEST_IMG"
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io_pattern readv $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
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io_pattern readv $((5 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
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io_pattern readv $((6 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
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io_pattern readv $((7 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
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io_pattern readv $((8 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((9 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((10 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((11 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
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io_pattern readv $((12 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
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io_pattern readv $((13 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
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io_pattern readv $((14 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
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io_pattern readv $((15 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
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echo
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echo "=== Test rebase in a subdirectory of the working directory ==="
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echo
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# Clean up the old images beforehand so they do not interfere with
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# this test
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_cleanup
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mkdir "$TEST_DIR/subdir"
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# Relative to the overlay
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BASE_OLD_OREL="t.$IMGFMT.base_old"
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BASE_NEW_OREL="t.$IMGFMT.base_new"
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# Relative to $TEST_DIR (which is going to be our working directory)
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OVERLAY_WREL="subdir/t.$IMGFMT"
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BASE_OLD="$TEST_DIR/subdir/$BASE_OLD_OREL"
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BASE_NEW="$TEST_DIR/subdir/$BASE_NEW_OREL"
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OVERLAY="$TEST_DIR/$OVERLAY_WREL"
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# Test done here:
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#
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# Backing (old): 11 11 -- 11
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# Backing (new): -- 22 22 11
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# Overlay: -- -- -- --
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#
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# Rebasing works, we have verified that above. Here, we just want to
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# see that rebasing is done for the correct target backing file.
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TEST_IMG=$BASE_OLD _make_test_img 1M
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TEST_IMG=$BASE_NEW _make_test_img 1M
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TEST_IMG=$OVERLAY _make_test_img -b "$BASE_OLD_OREL" -F $IMGFMT 1M
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echo
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$QEMU_IO "$BASE_OLD" \
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-c "write -P 0x11 $((0 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
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-c "write -P 0x11 $((3 * CLUSTER_SIZE)) $((1 * CLUSTER_SIZE))" \
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| _filter_qemu_io
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$QEMU_IO "$BASE_NEW" \
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-c "write -P 0x22 $((1 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
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-c "write -P 0x11 $((3 * CLUSTER_SIZE)) $((1 * CLUSTER_SIZE))" \
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| _filter_qemu_io
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echo
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pushd "$TEST_DIR" >/dev/null
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$QEMU_IMG rebase -f "$IMGFMT" -b "$BASE_NEW_OREL" -F $IMGFMT "$OVERLAY_WREL"
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popd >/dev/null
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# Verify the backing path is correct
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TEST_IMG=$OVERLAY _img_info | grep '^backing file:'
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echo
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# Verify the data is correct
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$QEMU_IO "$OVERLAY" \
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-c "read -P 0x11 $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
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-c "read -P 0x11 $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
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-c "read -P 0x00 $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
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-c "read -P 0x11 $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
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| _filter_qemu_io
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echo
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# Verify that cluster #3 is not allocated (because it is the same in
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# $BASE_OLD and $BASE_NEW)
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$QEMU_IMG map "$OVERLAY" | _filter_qemu_img_map
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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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