SR_SECURITY_DESCRIPTOR - NtDoc

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

/**
 * The SR_SECURITY_DESCRIPTOR structure contains information about the security privileges of the user.
 *
 * \sa https://learn.microsoft.com/en-us/windows/win32/api/subauth/ns-subauth-sr_security_descriptor
 */
typedef struct _SR_SECURITY_DESCRIPTOR
{
    ULONG Length;                   // Indicates the size in bytes of the structure.
    PUCHAR SecurityDescriptor;      // Indicates the user's security privileges.
} SR_SECURITY_DESCRIPTOR, *PSR_SECURITY_DESCRIPTOR;

#endif

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NtDoc

This type is documented in the [MS-SAMR] specification.