RtlAbsoluteToSelfRelativeSD routine

The RtlAbsoluteToSelfRelativeSD routine creates a new security descriptor in self-relative format by using a security descriptor in absolute format as a template.

Syntax


NTSTATUS RtlAbsoluteToSelfRelativeSD(
  _In_    PSECURITY_DESCRIPTOR AbsoluteSecurityDescriptor,
  _Out_   PSECURITY_DESCRIPTOR SelfRelativeSecurityDescriptor,
  _Inout_ PULONG               BufferLength
);

Parameters

AbsoluteSecurityDescriptor [in]

Pointer to a caller-allocated buffer that contains a SECURITY_DESCRIPTOR structure in absolute format. RtlAbsoluteToSelfRelativeSD creates a version of this security descriptor in self-relative format without modifying the original.

SelfRelativeSecurityDescriptor [out]

Pointer to a caller-allocated buffer that receives a security descriptor in self-relative format.

BufferLength [in, out]

Pointer to a caller-allocated variable that specifies the size, in bytes, of the buffer pointed to by the SelfRelativeSecurityDescriptor parameter. If the buffer is not large enough to hold the security descriptor, RtlAbsoluteToSelfRelativeSD returns STATUS_BUFFER_TOO_SMALL and sets this variable to the minimum required size.

Return value

RtlAbsoluteToSelfRelativeSD returns STATUS_SUCCESS or an appropriate NTSTATUS value such as one of the following:

Return codeDescription
STATUS_BAD_DESCRIPTOR_FORMAT

The buffer pointed to by the AbsoluteSecurityDescriptor parameter did not contain a SECURITY_DESCRIPTOR structure in absolute format. STATUS_BAD_DESCRIPTOR_FORMAT is an error code.

STATUS_BUFFER_TOO_SMALL

The buffer pointed to by the SelfRelativeSecurityDescriptor parameter was too small to contain the security descriptor in self-relative format. STATUS_BUFFER_TOO_SMALL is an error code.

 

Remarks

A security descriptor in absolute format contains pointers to the information it contains, rather than containing the information itself. A security descriptor in self-relative format contains the information in a contiguous block of memory. In a self-relative security descriptor, a SECURITY_DESCRIPTOR structure always starts the information, but the security descriptor's other components can follow the SECURITY_DESCRIPTOR structure in any order. Instead of using memory addresses, the components of the security descriptor are identified by offsets from the beginning of the security descriptor. This format is useful when a security descriptor must be stored on a disk or transmitted by means of a communications protocol.

To create a new security descriptor in absolute format by using a security descriptor in self-relative format as a template, use RtlSelfRelativeToAbsoluteSD.

For more information about security and access control, see the Microsoft Windows SDK documentation.

Requirements

Target platform

Universal

Version

This routine is available on Microsoft Windows Server 2003 SP1 and later.

Header

Ntifs.h (include Ntifs.h)

Library

NtosKrnl.lib

DLL

NtosKrnl.exe (kernel mode);
Ntdll.dll (user mode)

IRQL

<= APC_LEVEL

See also

ACL
RtlCreateSecurityDescriptor
RtlLengthSecurityDescriptor
RtlSelfRelativeToAbsoluteSD
RtlSetDaclSecurityDescriptor
RtlSetOwnerSecurityDescriptor
RtlValidSecurityDescriptor

 

 

Send comments about this topic to Microsoft

Show: