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42d43d35d9
cloop stores the number of compressed blocks in the n_blocks header
field. The file actually contains n_blocks + 1 offsets, where the extra
offset is the end-of-file offset.
The following line in cloop_read_block() results in an out-of-bounds
offsets[] access:
uint32_t bytes = s->offsets[block_num + 1] - s->offsets[block_num];
This patch allocates and loads the extra offset so that
cloop_read_block() works correctly when the last block is accessed.
Notice that we must free s->offsets[] unconditionally now since there is
always an end-of-file offset.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
107 lines
3.3 KiB
Bash
Executable File
107 lines
3.3 KiB
Bash
Executable File
#!/bin/bash
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#
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# cloop format input validation tests
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#
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# Copyright (C) 2013 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=stefanha@redhat.com
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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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tmp=/tmp/$$
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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 cloop
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_supported_proto generic
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_supported_os Linux
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block_size_offset=128
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n_blocks_offset=132
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offsets_offset=136
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echo
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echo "== check that the first sector can be read =="
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_use_sample_img simple-pattern.cloop.bz2
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$QEMU_IO -c "read 0 512" $TEST_IMG 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "== check that the last sector can be read =="
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_use_sample_img simple-pattern.cloop.bz2
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$QEMU_IO -c "read $((1024 * 1024 - 512)) 512" $TEST_IMG 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "== block_size must be a multiple of 512 =="
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_use_sample_img simple-pattern.cloop.bz2
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poke_file "$TEST_IMG" "$block_size_offset" "\x00\x00\x02\x01"
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$QEMU_IO -c "read 0 512" $TEST_IMG 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "== block_size cannot be zero =="
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_use_sample_img simple-pattern.cloop.bz2
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poke_file "$TEST_IMG" "$block_size_offset" "\x00\x00\x00\x00"
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$QEMU_IO -c "read 0 512" $TEST_IMG 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "== huge block_size ==="
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_use_sample_img simple-pattern.cloop.bz2
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poke_file "$TEST_IMG" "$block_size_offset" "\xff\xff\xfe\x00"
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$QEMU_IO -c "read 0 512" $TEST_IMG 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "== offsets_size overflow ==="
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_use_sample_img simple-pattern.cloop.bz2
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poke_file "$TEST_IMG" "$n_blocks_offset" "\xff\xff\xff\xff"
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$QEMU_IO -c "read 0 512" $TEST_IMG 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "== refuse images that require too many offsets ==="
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_use_sample_img simple-pattern.cloop.bz2
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poke_file "$TEST_IMG" "$n_blocks_offset" "\x04\x00\x00\x01"
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$QEMU_IO -c "read 0 512" $TEST_IMG 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "== refuse images with non-monotonically increasing offsets =="
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_use_sample_img simple-pattern.cloop.bz2
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poke_file "$TEST_IMG" "$offsets_offset" "\x00\x00\x00\x00\xff\xff\xff\xff"
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poke_file "$TEST_IMG" $((offsets_offset + 8)) "\x00\x00\x00\x00\xff\xfe\x00\x00"
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$QEMU_IO -c "read 0 512" $TEST_IMG 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "== refuse images with invalid compressed block size =="
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_use_sample_img simple-pattern.cloop.bz2
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poke_file "$TEST_IMG" "$offsets_offset" "\x00\x00\x00\x00\x00\x00\x00\x00"
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poke_file "$TEST_IMG" $((offsets_offset + 8)) "\xff\xff\xff\xff\xff\xff\xff\xff"
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$QEMU_IO -c "read 0 512" $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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