6cba5377f5
Commit abd3622cc0 added a case to 122
regarding how the qcow2 driver handles an incorrect compressed data
length value. This does not really fit into 122, as that file is
supposed to contain qemu-img convert test cases, which this case is not.
So this patch splits it off into its own file; maybe we will even get
more qcow2-only compression tests in the future.
Also, that test case does not work with refcount_bits=1, so mark that
option as unsupported.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20180406164108.26118-1-mreitz@redhat.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
98 lines
3.6 KiB
Bash
Executable File
98 lines
3.6 KiB
Bash
Executable File
#!/bin/bash
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#
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# Test qcow2 image compression
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#
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# Copyright (C) 2018 Igalia, S.L.
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# Author: Alberto Garcia <berto@igalia.com>
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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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seq=$(basename "$0")
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echo "QA output created by $seq"
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here=$PWD
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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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_supported_os Linux
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# Repairing the corrupted image requires qemu-img check to store a
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# refcount up to 3, which requires at least two refcount bits.
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_unsupported_imgopts 'refcount_bits=1[^0-9]'
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echo
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echo "=== Corrupted size field in compressed cluster descriptor ==="
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echo
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# Create an empty image and fill half of it with compressed data.
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# The L2 entries of the two compressed clusters are located at
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# 0x800000 and 0x800008, their original values are 0x4008000000a00000
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# and 0x4008000000a00802 (5 sectors for compressed data each).
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_make_test_img 8M -o cluster_size=2M
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$QEMU_IO -c "write -c -P 0x11 0 2M" -c "write -c -P 0x11 2M 2M" "$TEST_IMG" \
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2>&1 | _filter_qemu_io | _filter_testdir
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# Reduce size of compressed data to 4 sectors: this corrupts the image.
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poke_file "$TEST_IMG" $((0x800000)) "\x40\x06"
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$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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# 'qemu-img check' however doesn't see anything wrong because it
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# doesn't try to decompress the data and the refcounts are consistent.
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# TODO: update qemu-img so this can be detected.
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_check_test_img
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# Increase size of compressed data to the maximum (8192 sectors).
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# This makes QEMU read more data (8192 sectors instead of 5, host
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# addresses [0xa00000, 0xdfffff]), but the decompression algorithm
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# stops once we have enough to restore the uncompressed cluster, so
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# the rest of the data is ignored.
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poke_file "$TEST_IMG" $((0x800000)) "\x7f\xfe"
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# Do it also for the second compressed cluster (L2 entry at 0x800008).
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# In this case the compressed data would span 3 host clusters
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# (host addresses: [0xa00802, 0xe00801])
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poke_file "$TEST_IMG" $((0x800008)) "\x7f\xfe"
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# Here the image is too small so we're asking QEMU to read beyond the
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# end of the image.
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$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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# But if we grow the image we won't be reading beyond its end anymore.
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$QEMU_IO -c "write -P 0x22 4M 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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# The refcount data is however wrong because due to the increased size
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# of the compressed data it now reaches the following host clusters.
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# This can be repaired by qemu-img check by increasing the refcount of
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# those clusters.
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# TODO: update qemu-img to correct the compressed cluster size instead.
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_check_test_img -r all
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$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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$QEMU_IO -c "read -P 0x22 4M 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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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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