vmdk: Fix data corruption bug in WRITE and READ handling
Fixed a MAJOR BUG in VMDK files on file boundaries on reads and ALSO ON WRITES WHICH MIGHT CORRUPT THE IMAGE AND DATA!!!!!! Triggered for example with the following VMDK file (partly listed): RW 4193792 FLAT "XP-W1-f001.vmdk" 0 RW 2097664 FLAT "XP-W1-f002.vmdk" 0 RW 4193792 FLAT "XP-W1-f003.vmdk" 0 RW 512 FLAT "XP-W1-f004.vmdk" 0 RW 4193792 FLAT "XP-W1-f005.vmdk" 0 RW 2097664 FLAT "XP-W1-f006.vmdk" 0 RW 4193792 FLAT "XP-W1-f007.vmdk" 0 RW 512 FLAT "XP-W1-f008.vmdk" 0 Patch includes: 1.) Patch fixes wrong calculation on extent boundaries. Especially it fixes the relativeness of the sector number to the current extent. Verfied correctness with: 1.) Converted either with Virtualbox to VDI and then with qemu-img and then with qemu-img only: VBoxManage clonehd --format vdi /VM/XP-W/new/XP-W1.vmdk ~/.VirtualBox/Harddisks/XP-W1-new-test.vdi ./qemu-img convert -O raw ~/.VirtualBox/Harddisks/XP-W1-new-test.vdi /root/QEMU/VM-XP-W1/XP-W1-via-VBOX.img md5sum /root/QEMU/VM-XP-W/XP-W1-direct.img md5sum /root/QEMU/VM-XP-W/XP-W1-via-VBOX.img => same MD5 hash 2.) Verified debug log files 3.) Run Windows XP successfully 4.) chkdsk run successfully without any errors Signed-off-by: Gerhard Wiesinger <lists@wiesinger.com> Acked-by: Fam Zheng <famcool@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
parent
cd30b53d22
commit
b1649fae49
10
block/vmdk.c
10
block/vmdk.c
@ -1092,6 +1092,7 @@ static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
|
|||||||
BDRVVmdkState *s = bs->opaque;
|
BDRVVmdkState *s = bs->opaque;
|
||||||
int ret;
|
int ret;
|
||||||
uint64_t n, index_in_cluster;
|
uint64_t n, index_in_cluster;
|
||||||
|
uint64_t extent_begin_sector, extent_relative_sector_num;
|
||||||
VmdkExtent *extent = NULL;
|
VmdkExtent *extent = NULL;
|
||||||
uint64_t cluster_offset;
|
uint64_t cluster_offset;
|
||||||
|
|
||||||
@ -1103,7 +1104,9 @@ static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
|
|||||||
ret = get_cluster_offset(
|
ret = get_cluster_offset(
|
||||||
bs, extent, NULL,
|
bs, extent, NULL,
|
||||||
sector_num << 9, 0, &cluster_offset);
|
sector_num << 9, 0, &cluster_offset);
|
||||||
index_in_cluster = sector_num % extent->cluster_sectors;
|
extent_begin_sector = extent->end_sector - extent->sectors;
|
||||||
|
extent_relative_sector_num = sector_num - extent_begin_sector;
|
||||||
|
index_in_cluster = extent_relative_sector_num % extent->cluster_sectors;
|
||||||
n = extent->cluster_sectors - index_in_cluster;
|
n = extent->cluster_sectors - index_in_cluster;
|
||||||
if (n > nb_sectors) {
|
if (n > nb_sectors) {
|
||||||
n = nb_sectors;
|
n = nb_sectors;
|
||||||
@ -1154,6 +1157,7 @@ static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
|
|||||||
VmdkExtent *extent = NULL;
|
VmdkExtent *extent = NULL;
|
||||||
int n, ret;
|
int n, ret;
|
||||||
int64_t index_in_cluster;
|
int64_t index_in_cluster;
|
||||||
|
uint64_t extent_begin_sector, extent_relative_sector_num;
|
||||||
uint64_t cluster_offset;
|
uint64_t cluster_offset;
|
||||||
VmdkMetaData m_data;
|
VmdkMetaData m_data;
|
||||||
|
|
||||||
@ -1196,7 +1200,9 @@ static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
|
|||||||
if (ret) {
|
if (ret) {
|
||||||
return -EINVAL;
|
return -EINVAL;
|
||||||
}
|
}
|
||||||
index_in_cluster = sector_num % extent->cluster_sectors;
|
extent_begin_sector = extent->end_sector - extent->sectors;
|
||||||
|
extent_relative_sector_num = sector_num - extent_begin_sector;
|
||||||
|
index_in_cluster = extent_relative_sector_num % extent->cluster_sectors;
|
||||||
n = extent->cluster_sectors - index_in_cluster;
|
n = extent->cluster_sectors - index_in_cluster;
|
||||||
if (n > nb_sectors) {
|
if (n > nb_sectors) {
|
||||||
n = nb_sectors;
|
n = nb_sectors;
|
||||||
|
Loading…
Reference in New Issue
Block a user