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qcow2: Fix error path for unknown incompatible features 

qcow2's report_unsupported_feature() had two bugs: A 32 bit truncation
would prevent feature table entries for bits 32-63 from being used, and
it could assign errp multiple times if there was more than one unknown
feature, resulting in an error_set() assertion failure.

Fix the truncation, make sure to set the error exactly once and add a
qemu-iotests case for it.

This fixes https://bugs.launchpad.net/qemu/+bug/1342704/

Reported-by: Maria Kustova <maria.k@catit.be>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2014-07-17 11:41:53 +02:00 committed by Stefan Hajnoczi
parent 5a73480450
commit 12ac6d3db7
4 changed files with 112 additions and 11 deletions
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21
block/qcow2.c
View File

@ -210,20 +210,31 @@ static void GCC_FMT_ATTR(3, 4) report_unsupported(BlockDriverState *bs,
static void report_unsupported_feature(BlockDriverState *bs,
Error **errp, Qcow2Feature *table, uint64_t mask)
{
char *features = g_strdup("");
char *old;
while (table && table->name[0] != '\0') {
if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) {
if (mask & (1 << table->bit)) {
report_unsupported(bs, errp, "%.46s", table->name);
mask &= ~(1 << table->bit);
if (mask & (1ULL << table->bit)) {
old = features;
features = g_strdup_printf("%s%s%.46s", old, *old ? ", " : "",
table->name);
g_free(old);
mask &= ~(1ULL << table->bit);
}
}
table++;
}
if (mask) {
report_unsupported(bs, errp, "Unknown incompatible feature: %" PRIx64,
mask);
old = features;
features = g_strdup_printf("%s%sUnknown incompatible feature: %" PRIx64,
old, *old ? ", " : "", mask);
g_free(old);
}
report_unsupported(bs, errp, "%s", features);
g_free(features);
}
/*

52
tests/qemu-iotests/036
View File

@ -1,6 +1,6 @@
#!/bin/bash
#
# Test that qcow2 unknown autoclear feature bits are cleared
# Test qcow2 feature bits
#
# Copyright (C) 2011 Red Hat, Inc.
# Copyright IBM, Corp. 2010
@ -50,6 +50,56 @@ _supported_os Linux
# Only qcow2v3 and later supports feature bits
IMGOPTS="compat=1.1"
echo
echo === Image with unknown incompatible feature bit ===
echo
_make_test_img 64M
$PYTHON qcow2.py "$TEST_IMG" set-feature-bit incompatible 63
# Without feature table
$PYTHON qcow2.py "$TEST_IMG" dump-header
_img_info
# With feature table containing bit 63
printf "\x00\x3f%s" "Test feature" | $PYTHON qcow2.py "$TEST_IMG" add-header-ext-stdio 0x6803f857
_img_info
echo
echo === Image with multiple incompatible feature bits ===
echo
_make_test_img 64M
$PYTHON qcow2.py "$TEST_IMG" set-feature-bit incompatible 61
$PYTHON qcow2.py "$TEST_IMG" set-feature-bit incompatible 62
$PYTHON qcow2.py "$TEST_IMG" set-feature-bit incompatible 63
# Without feature table
_img_info
# With feature table containing bit 63
printf "\x00\x3f%s" "Test feature" | $PYTHON qcow2.py "$TEST_IMG" add-header-ext-stdio 0x6803f857
_img_info
# With feature table containing bit 61
$PYTHON qcow2.py "$TEST_IMG" del-header-ext 0x6803f857
printf "\x00\x3d%s" "Test feature" | $PYTHON qcow2.py "$TEST_IMG" add-header-ext-stdio 0x6803f857
_img_info
# With feature table containing bits 61 and 62
$PYTHON qcow2.py "$TEST_IMG" del-header-ext 0x6803f857
printf "\x00\x3d%s\x00%40s\x00\x3e%s\x00%40s" "test1" "" "test2" "" | $PYTHON qcow2.py "$TEST_IMG" add-header-ext-stdio 0x6803f857
_img_info
# With feature table containing all bits
$PYTHON qcow2.py "$TEST_IMG" del-header-ext 0x6803f857
printf "\x00\x3d%s\x00%40s\x00\x3e%s\x00%40s\x00\x3f%s\x00%40s" "test1" "" "test2" "" "test3" "" | $PYTHON qcow2.py "$TEST_IMG" add-header-ext-stdio 0x6803f857
_img_info
# With feature table containing unrelated bits, including compatible/autoclear
$PYTHON qcow2.py "$TEST_IMG" del-header-ext 0x6803f857
printf "\x01\x3d%s\x00%40s\x00\x3e%s\x00%40s\x02\x3f%s\x00%40s\x00\x3c%s\x00%40s" "test1" "" "test2" "" "test3" "" "test4" "" | $PYTHON qcow2.py "$TEST_IMG" add-header-ext-stdio 0x6803f857
_img_info
echo === Create image with unknown autoclear feature bit ===
echo
_make_test_img 64M

35
tests/qemu-iotests/036.out
View File

@ -1,4 +1,39 @@
QA output created by 036
=== Image with unknown incompatible feature bit ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
magic 0x514649fb
version 3
backing_file_offset 0x0
backing_file_size 0x0
cluster_bits 16
size 67108864
crypt_method 0
l1_size 1
l1_table_offset 0x30000
refcount_table_offset 0x10000
refcount_table_clusters 1
nb_snapshots 0
snapshot_offset 0x0
incompatible_features 0x8000000000000000
compatible_features 0x0
autoclear_features 0x0
refcount_order 4
header_length 104
qemu-img: Could not open 'TEST_DIR/t.IMGFMT': 'image' uses a IMGFMT feature which is not supported by this qemu version: Unknown incompatible feature: 8000000000000000
qemu-img: Could not open 'TEST_DIR/t.IMGFMT': 'image' uses a IMGFMT feature which is not supported by this qemu version: Test feature
=== Image with multiple incompatible feature bits ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
qemu-img: Could not open 'TEST_DIR/t.IMGFMT': 'image' uses a IMGFMT feature which is not supported by this qemu version: Unknown incompatible feature: e000000000000000
qemu-img: Could not open 'TEST_DIR/t.IMGFMT': 'image' uses a IMGFMT feature which is not supported by this qemu version: Test feature, Unknown incompatible feature: 6000000000000000
qemu-img: Could not open 'TEST_DIR/t.IMGFMT': 'image' uses a IMGFMT feature which is not supported by this qemu version: Test feature, Unknown incompatible feature: c000000000000000
qemu-img: Could not open 'TEST_DIR/t.IMGFMT': 'image' uses a IMGFMT feature which is not supported by this qemu version: test1, test2, Unknown incompatible feature: 8000000000000000
qemu-img: Could not open 'TEST_DIR/t.IMGFMT': 'image' uses a IMGFMT feature which is not supported by this qemu version: test1, test2, test3
qemu-img: Could not open 'TEST_DIR/t.IMGFMT': 'image' uses a IMGFMT feature which is not supported by this qemu version: test2, Unknown incompatible feature: a000000000000000
=== Create image with unknown autoclear feature bit ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864

15
tests/qemu-iotests/qcow2.py
View File

@ -176,6 +176,10 @@ def cmd_add_header_ext(fd, magic, data):
h.extensions.append(QcowHeaderExtension.create(magic, data))
h.update(fd)
def cmd_add_header_ext_stdio(fd, magic):
data = sys.stdin.read()
cmd_add_header_ext(fd, magic, data)
def cmd_del_header_ext(fd, magic):
try:
magic = int(magic, 0)
@ -220,11 +224,12 @@ def cmd_set_feature_bit(fd, group, bit):
h.update(fd)
cmds = [
[ 'dump-header', cmd_dump_header, 0, 'Dump image header and header extensions' ],
[ 'set-header', cmd_set_header, 2, 'Set a field in the header'],
[ 'add-header-ext', cmd_add_header_ext, 2, 'Add a header extension' ],
[ 'del-header-ext', cmd_del_header_ext, 1, 'Delete a header extension' ],
[ 'set-feature-bit', cmd_set_feature_bit, 2, 'Set a feature bit'],
[ 'dump-header', cmd_dump_header, 0, 'Dump image header and header extensions' ],
[ 'set-header', cmd_set_header, 2, 'Set a field in the header'],
[ 'add-header-ext', cmd_add_header_ext, 2, 'Add a header extension' ],
[ 'add-header-ext-stdio', cmd_add_header_ext_stdio, 1, 'Add a header extension, data from stdin' ],
[ 'del-header-ext', cmd_del_header_ext, 1, 'Delete a header extension' ],
[ 'set-feature-bit', cmd_set_feature_bit, 2, 'Set a feature bit'],
]
def main(filename, cmd, args):