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146 lines
2.6 KiB
146 lines
2.6 KiB
//+-----------------------------------------------------------------------
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//
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// Microsoft Windows
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//
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// Copyright (c) Microsoft Corporation 1992 - 1994
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//
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// File: context.cxx
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//
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// Contents: context kernel-mode functions
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//
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//
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// History: 3/17/94 MikeSw Created
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//
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//------------------------------------------------------------------------
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#include <sspdrv.h>
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//+-------------------------------------------------------------------------
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//
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// Function: DeleteKernelContext
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//
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// Synopsis: Deletes a kernel context
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//
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// Effects: Frees memory, closes token handle.
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//
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// Arguments:
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//
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// Requires:
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//
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// Returns:
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//
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// Notes:
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//
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//--------------------------------------------------------------------------
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SECURITY_STATUS
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DeleteKernelContext(PKernelContext * ppList,
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PKSPIN_LOCK pslLock,
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PKernelContext pContext)
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{
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KIRQL OldIrql;
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//
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// First, find the record, then unlink the record from the list,
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// and fix up pointers.
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//
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KeAcquireSpinLock(pslLock, &OldIrql);
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if (!pContext)
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{
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KeReleaseSpinLock(pslLock, OldIrql);
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return(SEC_E_INVALID_HANDLE);
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}
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//
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// Now unlink from the list
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//
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if (pContext->pPrev)
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{
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pContext->pPrev->pNext = pContext->pNext;
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}
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else
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{
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*ppList = pContext->pNext;
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}
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if (pContext->pNext)
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{
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pContext->pNext->pPrev = pContext->pPrev;
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}
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//
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// copy out the package-specific context to return.
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// We are done with the list so we can release the spin lock
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//
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KeReleaseSpinLock(pslLock, OldIrql);
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if (pContext->TokenHandle != NULL)
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{
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NtClose(pContext->TokenHandle);
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}
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if (pContext->AccessToken != NULL)
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{
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ObDereferenceObject(pContext->AccessToken);
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}
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// And, finally, return the context record to our pool:
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FreeContextRec(pContext);
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return(STATUS_SUCCESS);
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}
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//+-------------------------------------------------------------------------
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//
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// Function: AddKernelContext
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//
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// Synopsis:
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//
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// Effects:
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//
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// Arguments:
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//
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// Requires:
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//
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// Returns:
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//
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// Notes:
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//
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//--------------------------------------------------------------------------
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void
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AddKernelContext( PKernelContext * ppList,
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PKSPIN_LOCK pslLock,
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PKernelContext pContext)
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{
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KIRQL OldIrql;
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KeAcquireSpinLock(pslLock, &OldIrql);
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pContext->pNext = *ppList;
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if (pContext->pNext)
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{
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pContext->pNext->pPrev = pContext;
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}
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pContext->pPrev = NULL;
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*ppList = pContext;
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KeReleaseSpinLock(pslLock, OldIrql);
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}
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