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Diffstat (limited to 'qemu/tests/qemu-iotests/060')
| -rwxr-xr-x | qemu/tests/qemu-iotests/060 | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/qemu/tests/qemu-iotests/060 b/qemu/tests/qemu-iotests/060 new file mode 100755 index 000000000..c81319c16 --- /dev/null +++ b/qemu/tests/qemu-iotests/060 @@ -0,0 +1,249 @@ +#!/bin/bash +# +# Test case for image corruption (overlapping data structures) in qcow2 +# +# Copyright (C) 2013 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=mreitz@redhat.com + +seq="$(basename $0)" +echo "QA output created by $seq" + +here="$PWD" +tmp=/tmp/$$ +status=1 # failure is the default! + +_cleanup() +{ + _cleanup_test_img +} +trap "_cleanup; exit \$status" 0 1 2 3 15 + +# get standard environment, filters and checks +. ./common.rc +. ./common.filter + +# This tests qocw2-specific low-level functionality +_supported_fmt qcow2 +_supported_proto file +_supported_os Linux + +rt_offset=65536 # 0x10000 (XXX: just an assumption) +rb_offset=131072 # 0x20000 (XXX: just an assumption) +l1_offset=196608 # 0x30000 (XXX: just an assumption) +l2_offset=262144 # 0x40000 (XXX: just an assumption) +l2_offset_after_snapshot=524288 # 0x80000 (XXX: just an assumption) + +IMGOPTS="compat=1.1" + +OPEN_RW="open -o overlap-check=all $TEST_IMG" +# Overlap checks are done before write operations only, therefore opening an +# image read-only makes the overlap-check option irrelevant +OPEN_RO="open -r $TEST_IMG" + +echo +echo "=== Testing L2 reference into L1 ===" +echo +_make_test_img 64M +# Link first L1 entry (first L2 table) onto itself +# (Note the MSb in the L1 entry is set, ensuring the refcount is one - else any +# later write will result in a COW operation, effectively ruining this attempt +# on image corruption) +poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x03\x00\x00" +_check_test_img + +# The corrupt bit should not be set anyway +$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features + +# Try to write something, thereby forcing the corrupt bit to be set +$QEMU_IO -c "$OPEN_RW" -c "write -P 0x2a 0 512" | _filter_qemu_io + +# The corrupt bit must now be set +$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features + +# This information should be available through qemu-img info +_img_info --format-specific + +# Try to open the image R/W (which should fail) +$QEMU_IO -c "$OPEN_RW" -c "read 0 512" 2>&1 | _filter_qemu_io \ + | _filter_testdir \ + | _filter_imgfmt + +# Try to open it RO (which should succeed) +$QEMU_IO -c "$OPEN_RO" -c "read 0 512" | _filter_qemu_io + +# We could now try to fix the image, but this would probably fail (how should an +# L2 table linked onto the L1 table be fixed?) + +echo +echo "=== Testing cluster data reference into refcount block ===" +echo +_make_test_img 64M +# Allocate L2 table +truncate -s "$(($l2_offset+65536))" "$TEST_IMG" +poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x04\x00\x00" +# Mark cluster as used +poke_file "$TEST_IMG" "$(($rb_offset+8))" "\x00\x01" +# Redirect new data cluster onto refcount block +poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x02\x00\x00" +_check_test_img +$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features +$QEMU_IO -c "$OPEN_RW" -c "write -P 0x2a 0 512" | _filter_qemu_io +$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features + +# Try to fix it +_check_test_img -r all + +# The corrupt bit should be cleared +$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features + +# Look if it's really really fixed +$QEMU_IO -c "$OPEN_RW" -c "write -P 0x2a 0 512" | _filter_qemu_io +$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features + +echo +echo "=== Testing cluster data reference into inactive L2 table ===" +echo +_make_test_img 64M +$QEMU_IO -c "$OPEN_RW" -c "write -P 1 0 512" | _filter_qemu_io +$QEMU_IMG snapshot -c foo "$TEST_IMG" +$QEMU_IO -c "$OPEN_RW" -c "write -P 2 0 512" | _filter_qemu_io +# The inactive L2 table remains at its old offset +poke_file "$TEST_IMG" "$l2_offset_after_snapshot" \ + "\x80\x00\x00\x00\x00\x04\x00\x00" +_check_test_img +$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features +$QEMU_IO -c "$OPEN_RW" -c "write -P 3 0 512" | _filter_qemu_io +$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features +_check_test_img -r all +$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features +$QEMU_IO -c "$OPEN_RW" -c "write -P 4 0 512" | _filter_qemu_io +$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features + +# Check data +$QEMU_IO -c "$OPEN_RO" -c "read -P 4 0 512" | _filter_qemu_io +$QEMU_IMG snapshot -a foo "$TEST_IMG" +_check_test_img +$QEMU_IO -c "$OPEN_RO" -c "read -P 1 0 512" | _filter_qemu_io + +echo +echo "=== Testing overlap while COW is in flight ===" +echo +# compat=0.10 is required in order to make the following discard actually +# unallocate the sector rather than make it a zero sector - we want COW, after +# all. +IMGOPTS='compat=0.10' _make_test_img 1G +# Write two clusters, the second one enforces creation of an L2 table after +# the first data cluster. +$QEMU_IO -c 'write 0k 64k' -c 'write 512M 64k' "$TEST_IMG" | _filter_qemu_io +# Discard the first cluster. This cluster will soon enough be reallocated and +# used for COW. +$QEMU_IO -c 'discard 0k 64k' "$TEST_IMG" | _filter_qemu_io +# Now, corrupt the image by marking the second L2 table cluster as free. +poke_file "$TEST_IMG" '131084' "\x00\x00" # 0x2000c +# Start a write operation requiring COW on the image stopping it right before +# doing the read; then, trigger the corruption prevention by writing anything to +# any unallocated cluster, leading to an attempt to overwrite the second L2 +# table. Finally, resume the COW write and see it fail (but not crash). +echo "open -o file.driver=blkdebug $TEST_IMG +break cow_read 0 +aio_write 0k 1k +wait_break 0 +write 64k 64k +resume 0" | $QEMU_IO | _filter_qemu_io + +echo +echo "=== Testing unallocated image header ===" +echo +_make_test_img 64M +# Create L1/L2 +$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io +poke_file "$TEST_IMG" "$rb_offset" "\x00\x00" +$QEMU_IO -c "write 64k 64k" "$TEST_IMG" | _filter_qemu_io + +echo +echo "=== Testing unaligned L1 entry ===" +echo +_make_test_img 64M +$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io +# This will be masked with ~(512 - 1) = ~0x1ff, so whether the lower 9 bits are +# aligned or not does not matter +poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x04\x2a\x00" +$QEMU_IO -c "read 0 64k" "$TEST_IMG" | _filter_qemu_io + +# Test how well zero cluster expansion can cope with this +_make_test_img 64M +$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io +poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x04\x2a\x00" +$QEMU_IMG amend -o compat=0.10 "$TEST_IMG" + +echo +echo "=== Testing unaligned L2 entry ===" +echo +_make_test_img 64M +$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io +poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x05\x2a\x00" +$QEMU_IO -c "read 0 64k" "$TEST_IMG" | _filter_qemu_io + +echo +echo "=== Testing unaligned pre-allocated zero cluster ===" +echo +_make_test_img 64M +$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io +poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x05\x2a\x01" +# zero cluster expansion +$QEMU_IMG amend -o compat=0.10 "$TEST_IMG" + +echo +echo "=== Testing unaligned reftable entry ===" +echo +_make_test_img 64M +poke_file "$TEST_IMG" "$rt_offset" "\x00\x00\x00\x00\x00\x02\x2a\x00" +$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io + +echo +echo "=== Testing non-fatal corruption on freeing ===" +echo +_make_test_img 64M +$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io +poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x05\x2a\x00" +$QEMU_IO -c "discard 0 64k" "$TEST_IMG" | _filter_qemu_io + +echo +echo "=== Testing read-only corruption report ===" +echo +_make_test_img 64M +$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io +poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x05\x2a\x00" +# Should only emit a single error message +$QEMU_IO -c "$OPEN_RO" -c "read 0 64k" -c "read 0 64k" | _filter_qemu_io + +echo +echo "=== Testing non-fatal and then fatal corruption report ===" +echo +_make_test_img 64M +$QEMU_IO -c "write 0 128k" "$TEST_IMG" | _filter_qemu_io +poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x05\x2a\x00" +poke_file "$TEST_IMG" "$(($l2_offset+8))" "\x80\x00\x00\x00\x00\x06\x2a\x00" +# Should emit two error messages +$QEMU_IO -c "discard 0 64k" -c "read 64k 64k" "$TEST_IMG" | _filter_qemu_io + +# success, all done +echo "*** done" +rm -f $seq.full +status=0 |