Mapping Logon SIDs to POSIX Identifiers

Logon SIDs are assigned by the Windows logon process for each logon session and have the form S-1-5-5-X-Y, where X and Y are treated as a single LARGE_INTEGER that is incremented for each logon session. POSIX offsets, as described in section, are not used during the logon SID to POSIX identifier mapping process. These SIDs are mapped to the constant POSIX ID 0xFFF.