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Windows: enhancements to the mechanism preserving file timestamps, especially for keyfiles.

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This commit is contained in:
Mounir IDRASSI
2019-12-08 22:51:49 +01:00
parent 7f1e21e6a1
commit 5e96a5c44c
8 changed files with 139 additions and 79 deletions
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34
src/Driver/Ntvol.c
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@@ -303,7 +303,7 @@ NTSTATUS TCOpenVolume (PDEVICE_OBJECT DeviceObject,
if (mount->bMountReadOnly || ntStatus == STATUS_ACCESS_DENIED)
{
ntStatus = ZwCreateFile (&Extension->hDeviceFile,
GENERIC_READ | SYNCHRONIZE,
GENERIC_READ | (!bRawDevice && mount->bPreserveTimestamp? FILE_WRITE_ATTRIBUTES : 0) | SYNCHRONIZE,
&oaFileAttributes,
&IoStatusBlock,
NULL,
@@ -318,6 +318,26 @@ NTSTATUS TCOpenVolume (PDEVICE_OBJECT DeviceObject,
NULL,
0);
if (!NT_SUCCESS (ntStatus) && !bRawDevice && mount->bPreserveTimestamp)
{
/* try again without FILE_WRITE_ATTRIBUTES */
ntStatus = ZwCreateFile (&Extension->hDeviceFile,
GENERIC_READ | SYNCHRONIZE,
&oaFileAttributes,
&IoStatusBlock,
NULL,
FILE_ATTRIBUTE_NORMAL |
FILE_ATTRIBUTE_SYSTEM,
exclusiveAccess ? FILE_SHARE_READ : FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
FILE_RANDOM_ACCESS |
FILE_WRITE_THROUGH |
(disableBuffering ? FILE_NO_INTERMEDIATE_BUFFERING : 0) |
FILE_SYNCHRONOUS_IO_NONALERT,
NULL,
0);
}
if (NT_SUCCESS (ntStatus) && !mount->bMountReadOnly)
mount->VolumeMountedReadOnlyAfterAccessDenied = TRUE;
@@ -362,6 +382,18 @@ NTSTATUS TCOpenVolume (PDEVICE_OBJECT DeviceObject,
Extension->fileLastWriteTime = FileBasicInfo.LastWriteTime;
Extension->fileLastChangeTime = FileBasicInfo.ChangeTime;
Extension->bTimeStampValid = TRUE;
// we tell the system not to update LastAccessTime, LastWriteTime, and ChangeTime
FileBasicInfo.CreationTime.QuadPart = 0;
FileBasicInfo.LastAccessTime.QuadPart = -1;
FileBasicInfo.LastWriteTime.QuadPart = -1;
FileBasicInfo.ChangeTime.QuadPart = -1;
ZwSetInformationFile (Extension->hDeviceFile,
&IoStatusBlock,
&FileBasicInfo,
sizeof (FileBasicInfo),
FileBasicInformation);
}
ntStatus = ZwQueryInformationFile (Extension->hDeviceFile,