SeAccessCheck function (wdm.h)

SeAccessCheck determines whether the requested access rights can be granted to an object protected by a security descriptor and an object owner.


BOOLEAN SeAccessCheck(
  [in]  PSECURITY_DESCRIPTOR      SecurityDescriptor,
  [in]  PSECURITY_SUBJECT_CONTEXT SubjectSecurityContext,
  [in]  BOOLEAN                   SubjectContextLocked,
  [in]  ACCESS_MASK               DesiredAccess,
  [in]  ACCESS_MASK               PreviouslyGrantedAccess,
  [out] PPRIVILEGE_SET            *Privileges,
  [in]  PGENERIC_MAPPING          GenericMapping,
  [in]  KPROCESSOR_MODE           AccessMode,
  [out] PACCESS_MASK              GrantedAccess,
  [out] PNTSTATUS                 AccessStatus


[in] SecurityDescriptor

Pointer to the SECURITY_DESCRIPTOR structure that describes the security descriptor protecting the object being accessed.

[in] SubjectSecurityContext

Pointer to the opaque SECURITY_SUBJECT_CONTEXT structure that specifies the subject's captured security context.

[in] SubjectContextLocked

Boolean value that indicates whether the user's subject context is locked, so that it does not have to be locked again.

[in] DesiredAccess

Specifies the ACCESS_MASK bitmask for the access rights that the caller is attempting to acquire. If the caller sets the MAXIMUM_ALLOWED bit, the routine performs all DACL checks. However, SeAccessCheck does not do any privilege checks unless the caller specifically requests them by setting the ACCESS_SYSTEM_SECURITY or WRITE_OWNER bits.

[in] PreviouslyGrantedAccess

Specifies the ACCESS_MASK bitmask of access rights already granted, such as access rights granted as a result of holding a privilege.

[out] Privileges

Pointer to a caller-supplied variable to be set to the address of the PRIVILEGE_SET structure that will be used as part of the access validation, or this parameter can be NULL. The returned buffer, if any, must be released by the caller with SeFreePrivileges.

[in] GenericMapping

Pointer to the GENERIC_MAPPING structure associated with this object type. This value specifies the specific access rights implied by each GENERIC_XXX access right.

[in] AccessMode

Specifies the access mode to be used in the check, either UserMode or KernelMode.

[out] GrantedAccess

Pointer to a returned access mask indicating the granted access. If the caller specifies MAXIMUM_ALLOWED, and the DACL in SecurityDescriptor is NULL, then the routine returns GENERIC_ALL plus any additional access the caller explicitly requests.

[out] AccessStatus

Pointer to the status value indicating why access was denied.

Return value

If access is allowed, SeAccessCheck returns TRUE.


SeAccessCheck might perform privilege tests for SeTakeOwnershipPrivilege and SeSecurityPrivilege, depending on the accesses being requested. It might perform additional privilege testing in future releases of the operating system.

This routine also might check whether the caller is the owner of the object in order to grant WRITE_DAC or READ_CONTROL access.

If this routine returns FALSE, the caller should use the returned AccessStatus as its return value. That is, the caller should avoid hardcoding a return value of STATUS_ACCESS_DENIED or any other specific STATUS_XXX value.

For more information about security and access control, see Windows security model for driver developers and the documentation on these topics in the Microsoft Windows SDK.


Minimum supported client Windows 2000
Target Platform Universal
Header wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library NtosKrnl.lib
DLL NtosKrnl.exe
DDI compliance rules HwStorPortProhibitedDDIs(storport), PowerIrpDDis(wdm)

See also