You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
145 lines
2.9 KiB
145 lines
2.9 KiB
//+-----------------------------------------------------------------------
|
|
//
|
|
// Microsoft Windows
|
|
//
|
|
// Copyright (c) Microsoft Corporation 1992 - 1997
|
|
//
|
|
// File: context.cxx
|
|
//
|
|
// Contents: context kernel-mode functions
|
|
//
|
|
//
|
|
// History: 3/17/94 MikeSw Created
|
|
// 12/15/97 AdamBa Modified from private\lsa\client\ssp
|
|
//
|
|
//------------------------------------------------------------------------
|
|
|
|
#include <rdrssp.h>
|
|
|
|
|
|
//+-------------------------------------------------------------------------
|
|
//
|
|
// Function: DeleteKernelContext
|
|
//
|
|
// Synopsis: Deletes a kernel context
|
|
//
|
|
// Effects: Frees memory, closes token handle.
|
|
//
|
|
// Arguments:
|
|
//
|
|
// Requires:
|
|
//
|
|
// Returns:
|
|
//
|
|
// Notes:
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
SECURITY_STATUS
|
|
DeleteKernelContext(PKernelContext * ppList,
|
|
PKSPIN_LOCK pslLock,
|
|
PKernelContext pContext)
|
|
{
|
|
KIRQL OldIrql;
|
|
|
|
//
|
|
// First, find the record, then unlink the record from the list,
|
|
// and fix up pointers.
|
|
//
|
|
|
|
KeAcquireSpinLock(pslLock, &OldIrql);
|
|
|
|
|
|
if (!pContext)
|
|
{
|
|
KeReleaseSpinLock(pslLock, OldIrql);
|
|
return(SEC_E_INVALID_HANDLE);
|
|
}
|
|
|
|
//
|
|
// Now unlink from the list
|
|
//
|
|
|
|
if (pContext->pPrev)
|
|
{
|
|
pContext->pPrev->pNext = pContext->pNext;
|
|
}
|
|
else
|
|
{
|
|
*ppList = pContext->pNext;
|
|
}
|
|
|
|
|
|
if (pContext->pNext)
|
|
{
|
|
pContext->pNext->pPrev = pContext->pPrev;
|
|
}
|
|
|
|
//
|
|
// copy out the package-specific context to return.
|
|
// We are done with the list so we can release the spin lock
|
|
//
|
|
|
|
KeReleaseSpinLock(pslLock, OldIrql);
|
|
|
|
|
|
if (pContext->TokenHandle != NULL)
|
|
{
|
|
NtClose(pContext->TokenHandle);
|
|
}
|
|
if (pContext->AccessToken != NULL)
|
|
{
|
|
ObDereferenceObject(pContext->AccessToken);
|
|
}
|
|
|
|
// And, finally, return the context record to our pool:
|
|
|
|
FreeContextRec(pContext);
|
|
|
|
return(STATUS_SUCCESS);
|
|
|
|
}
|
|
|
|
|
|
//+-------------------------------------------------------------------------
|
|
//
|
|
// Function: AddKernelContext
|
|
//
|
|
// Synopsis:
|
|
//
|
|
// Effects:
|
|
//
|
|
// Arguments:
|
|
//
|
|
// Requires:
|
|
//
|
|
// Returns:
|
|
//
|
|
// Notes:
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
void
|
|
AddKernelContext( PKernelContext * ppList,
|
|
PKSPIN_LOCK pslLock,
|
|
PKernelContext pContext)
|
|
{
|
|
KIRQL OldIrql;
|
|
|
|
|
|
KeAcquireSpinLock(pslLock, &OldIrql);
|
|
|
|
pContext->pNext = *ppList;
|
|
if (pContext->pNext)
|
|
{
|
|
pContext->pNext->pPrev = pContext;
|
|
}
|
|
pContext->pPrev = NULL;
|
|
|
|
*ppList = pContext;
|
|
|
|
KeReleaseSpinLock(pslLock, OldIrql);
|
|
|
|
}
|
|
|
|
|
|
|
|
|