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Block patches for 5.0-rc0:

Browse source 
- Use-after-free fix
 - Fix for a memleak in an error path
 - Preventative measures against other potential use-after-frees, and
   against NULL deferences at runtime
 - iotest fixes
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Merge remote-tracking branch 'remotes/maxreitz/tags/pull-block-2020-03-24' into staging

Block patches for 5.0-rc0:
- Use-after-free fix
- Fix for a memleak in an error path
- Preventative measures against other potential use-after-frees, and
  against NULL deferences at runtime
- iotest fixes

# gpg: Signature made Tue 24 Mar 2020 12:19:09 GMT
# gpg:                using RSA key 91BEB60A30DB3E8857D11829F407DB0061D5CF40
# gpg:                issuer "mreitz@redhat.com"
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>" [full]
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1  1829 F407 DB00 61D5 CF40

* remotes/maxreitz/tags/pull-block-2020-03-24:
  iotests/026: Move v3-exclusive test to new file
  iotests: Fix cleanup path in some tests
  block/qcow2: zero data_file child after free
  block: bdrv_set_backing_bs: fix use-after-free
  block: Assert BlockDriver::format_name is not NULL
  block: Avoid memleak on qcow2 image info failure

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2020-03-24 12:24:41 +00:00
parent 09a98dd988 c264e5d2f9
commit 62a43e53fa
11 changed files with 111 additions and 45 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
block.c
View file

@ -363,6 +363,7 @@ char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp)
void bdrv_register(BlockDriver *bdrv)
{
assert(bdrv->format_name);
QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list);
}
@ -2759,10 +2760,10 @@ void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd,
if (bs->backing) {
bdrv_unref_child(bs, bs->backing);
bs->backing = NULL;
}
if (!backing_hd) {
bs->backing = NULL;
goto out;
}

3
block/qcow2.c
View file

@ -1758,6 +1758,7 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
g_free(s->image_data_file);
if (has_data_file(bs)) {
bdrv_unref_child(bs, s->data_file);
s->data_file = NULL;
}
g_free(s->unknown_header_fields);
cleanup_unknown_header_ext(bs);
@ -2621,6 +2622,7 @@ static void qcow2_close(BlockDriverState *bs)
if (has_data_file(bs)) {
bdrv_unref_child(bs, s->data_file);
s->data_file = NULL;
}
qcow2_refcount_close(bs);
@ -4811,6 +4813,7 @@ static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs,
if (local_err) {
error_propagate(errp, local_err);
qapi_free_ImageInfoSpecific(spec_info);
qapi_free_QCryptoBlockInfo(encrypt_info);
return NULL;
}
*spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){

31
tests/qemu-iotests/026
View file

@ -240,37 +240,6 @@ $QEMU_IO -c "write 0 $CLUSTER_SIZE" "$BLKDBG_TEST_IMG" | _filter_qemu_io
_check_test_img
echo
echo === Avoid freeing external data clusters on failure ===
echo
# Similar test as the last one, except we test what happens when there
# is an error when writing to an external data file instead of when
# writing to a preallocated zero cluster
_make_test_img -o "data_file=$TEST_IMG.data_file" $CLUSTER_SIZE
# Put blkdebug above the data-file, and a raw node on top of that so
# that blkdebug will see a write_aio event and emit an error
$QEMU_IO -c "write 0 $CLUSTER_SIZE" \
"json:{
'driver': 'qcow2',
'file': { 'driver': 'file', 'filename': '$TEST_IMG' },
'data-file': {
'driver': 'raw',
'file': {
'driver': 'blkdebug',
'config': '$TEST_DIR/blkdebug.conf',
'image': {
'driver': 'file',
'filename': '$TEST_IMG.data_file'
}
}
}
}" \
| _filter_qemu_io
_check_test_img
# success, all done
echo "*** done"
rm -f $seq.full

6
tests/qemu-iotests/026.out
View file

@ -653,10 +653,4 @@ wrote 1024/1024 bytes at offset 0
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
write failed: Input/output error
No errors were found on the image.
=== Avoid freeing external data clusters on failure ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1024 data_file=TEST_DIR/t.IMGFMT.data_file
write failed: Input/output error
No errors were found on the image.
*** done

6
tests/qemu-iotests/026.out.nocache
View file

@ -661,10 +661,4 @@ wrote 1024/1024 bytes at offset 0
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
write failed: Input/output error
No errors were found on the image.
=== Avoid freeing external data clusters on failure ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1024 data_file=TEST_DIR/t.IMGFMT.data_file
write failed: Input/output error
No errors were found on the image.
*** done

1
tests/qemu-iotests/085
View file

@ -39,6 +39,7 @@ SNAPSHOTS=10
_cleanup()
{
_cleanup_qemu
_cleanup_test_img
for i in $(seq 1 ${SNAPSHOTS})
do
_rm_test_img "${TEST_DIR}/${i}-${snapshot_virt0}"

6
tests/qemu-iotests/087
View file

@ -26,6 +26,12 @@ 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

2
tests/qemu-iotests/279
View file

@ -26,7 +26,7 @@ status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
rm -f "$TEST_IMG.mid"
_rm_test_img "$TEST_IMG.mid"
}
trap "_cleanup; exit \$status" 0 1 2 3 15

89
tests/qemu-iotests/289 Executable file
View file

@ -0,0 +1,89 @@
#!/usr/bin/env bash
#
# qcow2 v3-exclusive error path testing
# (026 tests paths common to v2 and v3)
#
# Copyright (C) 2020 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/>.
#
seq=$(basename $0)
echo "QA output created by $seq"
status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
rm "$TEST_DIR/blkdebug.conf"
rm -f "$TEST_IMG.data_file"
}
trap "_cleanup; exit \$status" 0 1 2 3 15
# get standard environment, filters and checks
. ./common.rc
. ./common.filter
. ./common.pattern
_supported_fmt qcow2
_supported_proto file
# This is a v3-exclusive test;
# As for data_file, error paths often very much depend on whether
# there is an external data file or not; so we create one exactly when
# we want to test it
_unsupported_imgopts 'compat=0.10' data_file
echo
echo === Avoid freeing external data clusters on failure ===
echo
cat > "$TEST_DIR/blkdebug.conf" <<EOF
[inject-error]
event = "write_aio"
errno = "5"
once = "on"
EOF
# Test what happens when there is an error when writing to an external
# data file instead of when writing to a preallocated zero cluster
_make_test_img -o "data_file=$TEST_IMG.data_file" 64k
# Put blkdebug above the data-file, and a raw node on top of that so
# that blkdebug will see a write_aio event and emit an error. This
# will then trigger the alloc abort code, which we want to test here.
$QEMU_IO -c "write 0 64k" \
"json:{
'driver': 'qcow2',
'file': { 'driver': 'file', 'filename': '$TEST_IMG' },
'data-file': {
'driver': 'raw',
'file': {
'driver': 'blkdebug',
'config': '$TEST_DIR/blkdebug.conf',
'image': {
'driver': 'file',
'filename': '$TEST_IMG.data_file'
}
}
}
}" \
| _filter_qemu_io
_check_test_img
# success, all done
echo "*** done"
rm -f $seq.full
status=0

8
tests/qemu-iotests/289.out Normal file
View file

@ -0,0 +1,8 @@
QA output created by 289
=== Avoid freeing external data clusters on failure ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=65536 data_file=TEST_DIR/t.IMGFMT.data_file
write failed: Input/output error
No errors were found on the image.
*** done

1
tests/qemu-iotests/group
View file

@ -295,3 +295,4 @@
284 rw
286 rw quick
288 quick
289 rw quick