Re: [PATCH v2 2/2] wbemprox: Get the disk drive serial number from mountmgr.

[Hans Leidekker]

On Mon, 2020-05-25 at 10:02 -0500, Zebediah Figura wrote:
> On 5/25/20 8:46 AM, Hans Leidekker wrote:
> > +static WCHAR *get_diskdrive_serialnumber( WCHAR letter )
> > +{
> > +    WCHAR *ret = NULL;
> > +    STORAGE_DEVICE_DESCRIPTOR *desc;
> > +    HANDLE handle = INVALID_HANDLE_VALUE;
> > +    STORAGE_PROPERTY_QUERY query = {0};
> > +    WCHAR drive[7];
> > +    DWORD size;
> > +
> > +    swprintf( drive, ARRAY_SIZE(drive), L"\\\\.\\%c:", letter );
> > +    handle = CreateFileW( drive, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, 0 );
>
> You shouldn't need read permissions to open the file; 
> IOCTL_STORAGE_QUERY_PROPERTY has FILE_ANY_ACCESS permissions.

Passing 0 desired access make no difference here, it ends up in the same
open(O_RDONLY) call on the Unix device file.