[qemu.git] / tests / qemu-iotests / 138

#!/usr/bin/env bash
#
# General test case for qcow2's image check
#
# Copyright (C) 2015 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
[email protected]

seq="$(basename $0)"
echo "QA output created by $seq"

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

echo
echo '=== Check on an image with a multiple of 2^32 clusters ==='
echo

IMGOPTS=$(_optstr_add "$IMGOPTS" "cluster_size=512") \
    _make_test_img 512

# Allocate L2 table
$QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io

# Put the data cluster at a multiple of 2 TB, resulting in the image apparently
# having a multiple of 2^32 clusters
# (To be more specific: It is at 32 PB)
poke_file "$TEST_IMG" 2048 "\x80\x80\x00\x00\x00\x00\x00\x00"

# An offset of 32 PB results in qemu-img check having to allocate an in-memory
# refcount table of 128 TB (16 bit refcounts, 512 byte clusters).
# This should be generally too much for any system and thus fail.
# What this test is checking is that the qcow2 driver actually tries to allocate
# such a large amount of memory (and is consequently aborting) instead of having
# truncated the cluster count somewhere (which would result in much less memory
# being allocated and then a segfault occurring).
_check_test_img

# success, all done
echo "*** done"
rm -f $seq.full
status=0
Commit	Line	Data
11a82d14	1	#!/usr/bin/env bash
097b500c HR	2	#
	3	# General test case for qcow2's image check
	4	#
	5	# Copyright (C) 2015 Red Hat, Inc.
	6	#
	7	# This program is free software; you can redistribute it and/or modify
	8	# it under the terms of the GNU General Public License as published by
	9	# the Free Software Foundation; either version 2 of the License, or
	10	# (at your option) any later version.
	11	#
	12	# This program is distributed in the hope that it will be useful,
	13	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	# GNU General Public License for more details.
	16	#
	17	# You should have received a copy of the GNU General Public License
	18	# along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	#
	20
	21	# creator
	22	[email protected]
	23
	24	seq="$(basename $0)"
	25	echo "QA output created by $seq"
	26
097b500c HR	27	status=1 # failure is the default!
	28
	29	_cleanup()
	30	{
	31	_cleanup_test_img
	32	}
	33	trap "_cleanup; exit \$status" 0 1 2 3 15
	34
	35	# get standard environment, filters and checks
	36	. ./common.rc
	37	. ./common.filter
	38
	39	# This tests qocw2-specific low-level functionality
	40	_supported_fmt qcow2
	41	_supported_proto file
	42	_supported_os Linux
	43
	44	echo
	45	echo '=== Check on an image with a multiple of 2^32 clusters ==='
	46	echo
	47
	48	IMGOPTS=$(_optstr_add "$IMGOPTS" "cluster_size=512") \
	49	_make_test_img 512
	50
	51	# Allocate L2 table
	52	$QEMU_IO -c 'write 0 512' "$TEST_IMG" \| _filter_qemu_io
	53
	54	# Put the data cluster at a multiple of 2 TB, resulting in the image apparently
	55	# having a multiple of 2^32 clusters
	56	# (To be more specific: It is at 32 PB)
	57	poke_file "$TEST_IMG" 2048 "\x80\x80\x00\x00\x00\x00\x00\x00"
	58
	59	# An offset of 32 PB results in qemu-img check having to allocate an in-memory
	60	# refcount table of 128 TB (16 bit refcounts, 512 byte clusters).
	61	# This should be generally too much for any system and thus fail.
	62	# What this test is checking is that the qcow2 driver actually tries to allocate
	63	# such a large amount of memory (and is consequently aborting) instead of having
	64	# truncated the cluster count somewhere (which would result in much less memory
	65	# being allocated and then a segfault occurring).
	66	_check_test_img
	67
	68	# success, all done
	69	echo "*** done"
	70	rm -f $seq.full
	71	status=0