// ntifs.h

NTSTATUS IoCheckDesiredAccess(
  PACCESS_MASK DesiredAccess,
  ACCESS_MASK  GrantedAccess
);
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Windows Driver Kit DDI reference (nf-ntifs-iocheckdesiredaccess)

IoCheckDesiredAccess function

Description

The IoCheckDesiredAccess routine determines whether the requested access rights to a file can be granted.

Parameters

`DesiredAccess`

Pointer to a variable containing a mask that identifies the requested access to the file.

`GrantedAccess`

Mask value that specifies the access currently granted to the file.

Return value

IoCheckDesiredAccess returns STATUS_SUCCESS if DesiredAccess is allowed given the current GrantedAccess; otherwise, it returns STATUS_ACCESS_DENIED.

IoCheckDesiredAccess - NtDoc