aslr_module_get_times and ReOpenFile support

[dmex]

• Is your feature request related to a problem? Please describe.

The aslr_module_get_times function has multiple issues with file handles per these comments:

dynamorio/core/win32/aslr.c

Lines 4475 to 4478 in b0237d2

	/* Note: this routine cannot be used on original handles since we
	* don't have proper permissions for the application handle. Leaving
	* the routine in case we find it useful for files that we have opened
	* ourselves and we want to detect too old files.

dynamorio/core/win32/aslr.c

Lines 4516 to 4519 in b0237d2

	/* FIXME: we can't even use DuplicateHandle() SDK: For example, a
	* file handle created with the GENERIC_READ access right cannot
	* be duplicated so that it has both the GENERIC_READ and
	* GENERIC_WRITE access right.

• Describe the solution you'd like

Add support for the ReOpenFile function since it fixes both issues including cases where handles are duplicated using DuplicateHandle. The function is available on Vista and above.

[derekbruening]

I assume you mean calling whatever ntdll.dll routines are used by kernel32 in its ReOpenFile code as we don't want core DR depending on kernel32.dll.

[dmex]

calling whatever ntdll.dll routines are used by kernel32 in its ReOpenFile

@derekbruening

ReOpenFile passes the original file handle as the OBJECT_ATTRIBUTES RootDirectory and calls the standard NtCreateFile function.

Here's a reimplementation using native routines:

NTSTATUS DynamoReOpenFile(
    _Out_ PHANDLE FileHandle,
    _In_ HANDLE OriginalFileHandle,
    _In_ ACCESS_MASK DesiredAccess,
    _In_ ULONG ShareAccess,
    _In_ ULONG OpenOptions
    )
{
    NTSTATUS status;
    HANDLE fileHandle;
    UNICODE_STRING fileName;
    OBJECT_ATTRIBUTES objectAttributes;
    IO_STATUS_BLOCK ioStatusBlock;

    RtlInitEmptyUnicodeString(&fileName, NULL, 0);
    InitializeObjectAttributes(
        &objectAttributes,
        &fileName,
        OBJ_CASE_INSENSITIVE,
        OriginalFileHandle,
        NULL
        );

    status = NtCreateFile(
        &fileHandle,
        DesiredAccess,
        &objectAttributes,
        &ioStatusBlock,
        NULL,
        0,
        ShareAccess,
        FILE_OPEN,
        OpenOptions,
        NULL,
        0
        );

    if (NT_SUCCESS(status))
    {
        *FileHandle = fileHandle;
    }

    return status;
}

FileName must also be a valid pointer to an empty UNICODE_STRING.