184581fa4d
When a write request needs to allocate new clusters (or change the L2 bitmap of existing ones) a QCowL2Meta structure is created so the L2 metadata can be later updated and any copy-on-write can be performed if necessary. A write request can span a region consisting of an arbitrary combination of previously unallocated and allocated clusters, and if the unallocated ones can be put contiguous to the existing ones then QEMU will do so in order to minimize the number of write operations. In practice this means that a write request has not just one but a number of QCowL2Meta structures. All of them are added to the cluster_allocs list that is stored in BDRVQcow2State and is used to detect overlapping requests. After the write request finishes all its associated QCowL2Meta are removed from that list. calculate_l2_meta() takes care of creating and putting those structures in the list, and qcow2_handle_l2meta() takes care of removing them. The problem is that the error path in handle_alloc() also tries to remove an item in that list, a remnant from the time when this was handled there (that code would not even be correct anymore because it only removes one struct and not all the ones from the same write request). This can trigger a double removal of the same item from the list, causing a crash. This is not easy to reproduce in practice because it requires that do_alloc_cluster_offset() fails after a successful previous allocation during the same write request, but it can be reproduced with the included test case. Signed-off-by: Alberto Garcia <berto@igalia.com> Message-Id: <3440a1c4d53c4fe48312b478c96accb338cbef7c.1599150873.git.berto@igalia.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
75 lines
2.5 KiB
Bash
Executable File
75 lines
2.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Test the handling of errors in write requests with multiple allocations
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#
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# Copyright (C) 2020 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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# creator
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owner=berto@igalia.com
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seq=`basename $0`
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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_supported_fmt qcow2
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_supported_proto file
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_supported_os Linux
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_unsupported_imgopts cluster_size refcount_bits extended_l2 compat=0.10 data_file
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echo '### Create the image'
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_make_test_img -o refcount_bits=64,cluster_size=1k 1M
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# The reference counts of the clusters for the first 123k of this
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# write request are stored in the first refcount block. The last
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# cluster (guest offset 123k) is referenced in the second refcount
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# block.
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echo '### Fill the first refcount block and one data cluster from the second'
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$QEMU_IO -c 'write 0 124k' "$TEST_IMG" | _filter_qemu_io
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echo '### Discard two of the last data clusters, leave one in the middle'
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$QEMU_IO -c 'discard 121k 1k' "$TEST_IMG" | _filter_qemu_io
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$QEMU_IO -c 'discard 123k 1k' "$TEST_IMG" | _filter_qemu_io
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echo '### Corrupt the offset of the second refcount block'
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refcount_table_offset=$(peek_file_be "$TEST_IMG" 48 8)
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poke_file "$TEST_IMG" $(($refcount_table_offset+14)) "\x06"
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# This tries to allocate the two clusters discarded earlier (guest
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# offsets 121k and 123k). Their reference counts are in the first and
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# second refcount blocks respectively, but only the first one can be
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# allocated correctly because the second entry of the refcount table
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# is corrupted.
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echo '### Try to allocate the discarded clusters again'
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$QEMU_IO -c 'write 121k 3k' "$TEST_IMG" | _filter_qemu_io
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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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