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//0x4 bytes (sizeof)
struct _IMAGE_SECURITY_CONTEXT
{
    union
    {
        VOID* PageHashes;                                                   //0x0
        ULONG Value;                                                        //0x0
        struct
        {
            ULONG SecurityBeingCreated:1;                                   //0x0
            ULONG SecurityMandatory:1;                                      //0x0
            ULONG Unused:1;                                                 //0x0
            ULONG PageHashPointer:29;                                       //0x0
        };
    };
};