test: cmquery.c File Reference

00037 : 00038 00039 This routine interfaces to the NT Object Manager. It is invoked when 00040 the object system wishes to discover the name of an object that 00041 belongs to the registry. 00042 00043 Arguments: 00044 00045 Object - pointer to a Key, thus -> KEY_BODY. 00046 00047 HasObjectName - indicates whether the object manager knows about a name 00048 for this object 00049 00050 ObjectNameInfo - place where we report the name 00051 00052 Length - maximum length they can deal with 00053 00054 ReturnLength - supplies variable to receive actual length 00055 00056 Return Value: 00057 00058 STATUS_SUCCESS 00059 00060 STATUS_INFO_LENGTH_MISMATCH 00061 00062 --*/ 00063 00064 { 00065 PUNICODE_STRING Name; 00066 PWCHAR t; 00067 PWCHAR s; 00068 ULONG l; 00069 NTSTATUS status; 00070 00071 UNREFERENCED_PARAMETER(HasObjectName); 00072 00073 CMLOG(CML_MINOR, CMS_PARSE) { 00074 KdPrint(("CmpQueryKeyName:\n")); 00075 } 00076 00077 CmpLockRegistry(); 00078 00079 if ( ((PCM_KEY_BODY)Object)->KeyControlBlock->Delete) { 00080 CmpUnlockRegistry(); 00081 return STATUS_KEY_DELETED; 00082 } 00083 Name = CmpConstructName(((PCM_KEY_BODY)Object)->KeyControlBlock); 00084 if (Name == NULL) { 00085 status = STATUS_INSUFFICIENT_RESOURCES; 00086 CmpUnlockRegistry(); 00087 return status; 00088 } 00089 00090 if (Length <= sizeof(OBJECT_NAME_INFORMATION)) { 00091 *ReturnLength = Name->Length + sizeof(WCHAR) + sizeof(OBJECT_NAME_INFORMATION); 00092 ExFreePoolWithTag(Name, CM_NAME_TAG | PROTECTED_POOL); 00093 CmpUnlockRegistry(); 00094 return STATUS_INFO_LENGTH_MISMATCH; // they can't even handle null 00095 } 00096 00097 t = (PWCHAR)(ObjectNameInfo + 1); 00098 s = Name->Buffer; 00099 l = Name->Length; 00100 l += sizeof(WCHAR); // account for null 00101 00102 00103 *ReturnLength = l + sizeof(OBJECT_NAME_INFORMATION); 00104 if (l > Length - sizeof(OBJECT_NAME_INFORMATION)) { 00105 l = Length - sizeof(OBJECT_NAME_INFORMATION); 00106 status = STATUS_INFO_LENGTH_MISMATCH; 00107 } else { 00108 status = STATUS_SUCCESS; 00109 } 00110 l -= sizeof(WCHAR); 00111 00112 // 00113 // The ObjectNameInfo buffer is a usermode buffer, so make sure we have an 00114 // exception handler in case a malicious app changes the protection out from 00115 // under us. 00116 // 00117 // Note the object manager is responsible for probing the buffer and ensuring 00118 // that a top-level exception handler returns the correct error code. We just 00119 // need to make sure we drop our lock. 00120 // 00121 try { 00122 RtlMoveMemory(t, s, l); 00123 t[l/sizeof(WCHAR)] = UNICODE_NULL; 00124 ObjectNameInfo->Name.Length = (USHORT)l; 00125 ObjectNameInfo->Name.MaximumLength = ObjectNameInfo->Name.Length; 00126 ObjectNameInfo->Name.Buffer = t; 00127 } finally { 00128 ExFreePoolWithTag(Name, CM_NAME_TAG | PROTECTED_POOL); 00129 CmpUnlockRegistry(); 00130 } 00131 return status; 00132 } }

cmquery.c File Reference

Functions

Function Documentation


Functions
NTSTATUS	CmpQueryKeyName (IN PVOID Object, IN BOOLEAN HasObjectName, OUT POBJECT_NAME_INFORMATION ObjectNameInfo, IN ULONG Length, OUT PULONG ReturnLength)