131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
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/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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cmquery.c
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Abstract:
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This module contains the object name query method for the registry.
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Author:
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Bryan M. Willman (bryanwi) 8-Apr-1992
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Revision History:
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--*/
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#include "cmp.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE,CmpQueryKeyName)
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#endif
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NTSTATUS
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CmpQueryKeyName(
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IN PVOID Object,
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IN BOOLEAN HasObjectName,
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OUT POBJECT_NAME_INFORMATION ObjectNameInfo,
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IN ULONG Length,
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OUT PULONG ReturnLength
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)
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/*++
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Routine Description:
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This routine interfaces to the NT Object Manager. It is invoked when
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the object system wishes to discover the name of an object that
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belongs to the registry.
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Arguments:
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Object - pointer to a Key, thus -> KEY_BODY.
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HasObjectName - indicates whether the object manager knows about a name
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for this object
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ObjectNameInfo - place where we report the name
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Length - maximum length they can deal with
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ReturnLength - supplies variable to receive actual length
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Return Value:
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STATUS_SUCCESS
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STATUS_INFO_LENGTH_MISMATCH
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--*/
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{
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PUNICODE_STRING Name;
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PWCHAR t;
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PWCHAR s;
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ULONG l;
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NTSTATUS status;
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UNREFERENCED_PARAMETER(HasObjectName);
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CmKdPrintEx((DPFLTR_CONFIG_ID,CML_PARSE,"CmpQueryKeyName:\n"));
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CmpLockRegistry();
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if ( ((PCM_KEY_BODY)Object)->KeyControlBlock->Delete) {
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CmpUnlockRegistry();
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return STATUS_KEY_DELETED;
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}
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Name = CmpConstructName(((PCM_KEY_BODY)Object)->KeyControlBlock);
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if (Name == NULL) {
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status = STATUS_INSUFFICIENT_RESOURCES;
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CmpUnlockRegistry();
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return status;
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}
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if (Length <= sizeof(OBJECT_NAME_INFORMATION)) {
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*ReturnLength = Name->Length + sizeof(WCHAR) + sizeof(OBJECT_NAME_INFORMATION);
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ExFreePoolWithTag(Name, CM_NAME_TAG | PROTECTED_POOL);
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CmpUnlockRegistry();
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return STATUS_INFO_LENGTH_MISMATCH; // they can't even handle null
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}
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t = (PWCHAR)(ObjectNameInfo + 1);
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s = Name->Buffer;
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l = Name->Length;
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l += sizeof(WCHAR); // account for null
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*ReturnLength = l + sizeof(OBJECT_NAME_INFORMATION);
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if (l > Length - sizeof(OBJECT_NAME_INFORMATION)) {
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l = Length - sizeof(OBJECT_NAME_INFORMATION);
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status = STATUS_INFO_LENGTH_MISMATCH;
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} else {
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status = STATUS_SUCCESS;
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}
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l -= sizeof(WCHAR);
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//
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// The ObjectNameInfo buffer is a usermode buffer, so make sure we have an
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// exception handler in case a malicious app changes the protection out from
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// under us.
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//
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// Note the object manager is responsible for probing the buffer and ensuring
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// that a top-level exception handler returns the correct error code. We just
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// need to make sure we drop our lock.
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//
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try {
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RtlCopyMemory(t, s, l);
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t[l/sizeof(WCHAR)] = UNICODE_NULL;
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ObjectNameInfo->Name.Length = (USHORT)l;
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ObjectNameInfo->Name.MaximumLength = ObjectNameInfo->Name.Length;
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ObjectNameInfo->Name.Buffer = t;
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} finally {
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ExFreePoolWithTag(Name, CM_NAME_TAG | PROTECTED_POOL);
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CmpUnlockRegistry();
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}
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return status;
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}
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