RtlValidSecurityDescriptor - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTRTL_H

_Check_return_
NTSYSAPI
BOOLEAN
NTAPI
RtlValidSecurityDescriptor(
    _In_ PSECURITY_DESCRIPTOR SecurityDescriptor
    );

#endif

View code on GitHub

This function is documented in Windows Driver Kit.