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vmdk: Don't corrupt desc file in vmdk_write_cid

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If the text description file is larger than DESC_SIZE, we force the last
byte in the buffer to be 0 and write it out.

This results in a corruption.

Try to allocate a big buffer in this case.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1923

Signed-off-by: Fam Zheng <fam@euphon.net>
Message-ID: <20231124115654.3239137-1-fam@euphon.net>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2023-11-24 11:56:54 +00:00 committed by Kevin Wolf
parent 3b7094fe83
commit 9fb7b350ba
3 changed files with 26 additions and 8 deletions
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28
block/vmdk.c
View File

@ -351,29 +351,41 @@ vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
BDRVVmdkState *s = bs->opaque;
int ret = 0;
desc = g_malloc0(DESC_SIZE);
tmp_desc = g_malloc0(DESC_SIZE);
ret = bdrv_co_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0);
size_t desc_buf_size;
if (s->desc_offset == 0) {
desc_buf_size = bdrv_getlength(bs->file->bs);
if (desc_buf_size > 16ULL << 20) {
error_report("VMDK description file too big");
return -EFBIG;
}
} else {
desc_buf_size = DESC_SIZE;
}
desc = g_malloc0(desc_buf_size);
tmp_desc = g_malloc0(desc_buf_size);
ret = bdrv_co_pread(bs->file, s->desc_offset, desc_buf_size, desc, 0);
if (ret < 0) {
goto out;
}
desc[DESC_SIZE - 1] = '\0';
desc[desc_buf_size - 1] = '\0';
tmp_str = strstr(desc, "parentCID");
if (tmp_str == NULL) {
ret = -EINVAL;
goto out;
}
pstrcpy(tmp_desc, DESC_SIZE, tmp_str);
pstrcpy(tmp_desc, desc_buf_size, tmp_str);
p_name = strstr(desc, "CID");
if (p_name != NULL) {
p_name += sizeof("CID");
snprintf(p_name, DESC_SIZE - (p_name - desc), "%" PRIx32 "\n", cid);
pstrcat(desc, DESC_SIZE, tmp_desc);
snprintf(p_name, desc_buf_size - (p_name - desc), "%" PRIx32 "\n", cid);
pstrcat(desc, desc_buf_size, tmp_desc);
}
ret = bdrv_co_pwrite_sync(bs->file, s->desc_offset, DESC_SIZE, desc, 0);
ret = bdrv_co_pwrite_sync(bs->file, s->desc_offset, desc_buf_size, desc, 0);
out:
g_free(desc);

2
tests/qemu-iotests/059
View File

@ -84,6 +84,8 @@ echo
echo "=== Testing big twoGbMaxExtentFlat ==="
_make_test_img -o "subformat=twoGbMaxExtentFlat" 1000G
_img_info --format-specific | _filter_img_info --format-specific
$QEMU_IO -c "write 990G 512 -P 89" "$TEST_IMG" | _filter_qemu_io
$QEMU_IO -c "read 990G 512 -P 89" "$TEST_IMG" | _filter_qemu_io
_cleanup_test_img
echo

4
tests/qemu-iotests/059.out
View File

@ -2032,6 +2032,10 @@ Format specific information:
virtual size: 2147483648
filename: TEST_DIR/t-f500.IMGFMT
format: FLAT
wrote 512/512 bytes at offset 1063004405760
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 512/512 bytes at offset 1063004405760
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Testing malformed VMFS extent description line ===
qemu-img: Could not open 'TEST_DIR/t.IMGFMT': Invalid extent line: RW 12582912 VMFS "dummy.IMGFMT" 1