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- Move ExGetPreviousMode to \ex, it's not a Ps function

Browse source 
- Organize thread.c into private/public functions properly.
- Do another pass of formatting fixes and function annotation.
- Fix a bug in PspSystemStartup.
- Properly hold object references towards a thread that's being created.
- Set the Thread->GrantedAccess value.
- Update NtOpenThread to use an Access State since these work now and Ob respects them, and also add a special hack present on NT: If the SeDEbugPrivilege is present, then the caller will get full thread access regardless of his rights.

svn path=/trunk/; revision=23179
This commit is contained in:
Alex Ionescu 2006-07-20 05:33:03 +00:00
parent 88aac74efb
commit ed65a3293e
4 changed files with 131 additions and 85 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
reactos/ntoskrnl/KrnlFun.c
View file

@ -35,6 +35,7 @@
// - Add security calls where necessary.
// - Add tracing.
// - Fix crash on shutdown due to possibly incorrect win32k uninitailization.
// - Add failure/race checks for thread creation.
//
// Ob:
// - Possible bug in deferred deletion under Cc Rewrite branch.

10
reactos/ntoskrnl/ex/sysinfo.c
View file

@ -23,6 +23,16 @@ VOID MmPrintMemoryStatistic(VOID);
/* FUNCTIONS *****************************************************************/
/*
* @implemented
*/
KPROCESSOR_MODE
NTAPI
ExGetPreviousMode (VOID)
{
return (KPROCESSOR_MODE)PsGetCurrentThread()->Tcb.PreviousMode;
}
/*
* @unimplemented
*/

7
reactos/ntoskrnl/include/internal/ob.h
View file

@ -192,6 +192,13 @@ ObpDeleteObject(
IN PVOID Object
);
LONG
FASTCALL
ObReferenceObjectEx(
IN PVOID Object,
IN ULONG Count
);
VOID
NTAPI
ObpReapObject(

198
reactos/ntoskrnl/ps/thread.c
View file

@ -15,8 +15,6 @@
/* GLOBALS ******************************************************************/
extern LIST_ENTRY PsActiveProcessHead;
extern PEPROCESS PsIdleProcess;
extern PVOID PspSystemDllEntryPoint;
extern PVOID PspSystemDllBase;
extern PHANDLE_TABLE PspCidTable;
@ -24,12 +22,12 @@ extern BOOLEAN CcPfEnablePrefetcher;
extern ULONG MmReadClusterSize;
POBJECT_TYPE PsThreadType = NULL;
/* FUNCTIONS ***************************************************************/
/* PRIVATE FUNCTIONS *********************************************************/
VOID
NTAPI
PspUserThreadStartup(PKSTART_ROUTINE StartRoutine,
PVOID StartContext)
PspUserThreadStartup(IN PKSTART_ROUTINE StartRoutine,
IN PVOID StartContext)
{
PETHREAD Thread;
PTEB Teb;
@ -109,8 +107,8 @@ PspUserThreadStartup(PKSTART_ROUTINE StartRoutine,
VOID
NTAPI
PspSystemThreadStartup(PKSTART_ROUTINE StartRoutine,
PVOID StartContext)
PspSystemThreadStartup(IN PKSTART_ROUTINE StartRoutine,
IN PVOID StartContext)
{
PETHREAD Thread;
@ -119,7 +117,7 @@ PspSystemThreadStartup(PKSTART_ROUTINE StartRoutine,
Thread = PsGetCurrentThread();
/* Make sure the thread isn't gone */
if (!(Thread->Terminated) || !(Thread->DeadThread))
if (!(Thread->Terminated) && !(Thread->DeadThread))
{
/* Call it the Start Routine */
StartRoutine(StartContext);
@ -329,65 +327,68 @@ PspCreateThread(OUT PHANDLE ThreadHandle,
/* Notify Thread Creation */
PspRunCreateThreadNotifyRoutines(Thread, TRUE);
/* Reference ourselves as a keep-alive */
ObReferenceObjectEx(Thread, 2);
/* Suspend the Thread if we have to */
if (CreateSuspended) KeSuspendThread(&Thread->Tcb);
/* Check if we were already terminated */
if (Thread->Terminated)
{
/* Force us to wake up to terminate */
KeForceResumeThread(&Thread->Tcb);
}
/* Reference ourselves as a keep-alive */
ObReferenceObject(Thread);
if (Thread->Terminated) KeForceResumeThread(&Thread->Tcb);
/* Insert the Thread into the Object Manager */
Status = ObInsertObject((PVOID)Thread,
Status = ObInsertObject(Thread,
NULL,
DesiredAccess,
0,
NULL,
&hThread);
if(NT_SUCCESS(Status))
if (NT_SUCCESS(Status))
{
/* Wrap in SEH to protect against bad user-mode pointers */
_SEH_TRY
{
/* Return Cid and Handle */
if(ClientId) *ClientId = Thread->Cid;
if (ClientId) *ClientId = Thread->Cid;
*ThreadHandle = hThread;
}
_SEH_HANDLE
{
/* Get the exception code */
Status = _SEH_GetExceptionCode();
}
_SEH_END;
}
/* FIXME: SECURITY */
/* Set the thread access mask */
Thread->GrantedAccess = THREAD_ALL_ACCESS;
/* Dispatch thread */
OldIrql = KeAcquireDispatcherDatabaseLock ();
KiReadyThread(&Thread->Tcb);
KeReleaseDispatcherDatabaseLock(OldIrql);
/* Dereference it, leaving only the keep-alive */
ObDereferenceObject(Thread);
/* Return */
return Status;
}
/* PUBLIC FUNCTIONS **********************************************************/
/*
* @implemented
*/
NTSTATUS
NTAPI
PsCreateSystemThread(PHANDLE ThreadHandle,
ACCESS_MASK DesiredAccess,
POBJECT_ATTRIBUTES ObjectAttributes,
HANDLE ProcessHandle,
PCLIENT_ID ClientId,
PKSTART_ROUTINE StartRoutine,
PVOID StartContext)
PsCreateSystemThread(OUT PHANDLE ThreadHandle,
IN ACCESS_MASK DesiredAccess,
IN POBJECT_ATTRIBUTES ObjectAttributes,
IN HANDLE ProcessHandle,
IN PCLIENT_ID ClientId,
IN PKSTART_ROUTINE StartRoutine,
IN PVOID StartContext)
{
PEPROCESS TargetProcess = NULL;
HANDLE Handle = ProcessHandle;
@ -429,8 +430,8 @@ PsLookupThreadByThreadId(IN HANDLE ThreadId,
KeEnterCriticalRegion();
/* Get the CID Handle Entry */
if ((CidEntry = ExMapHandleToPointer(PspCidTable,
ThreadId)))
CidEntry = ExMapHandleToPointer(PspCidTable, ThreadId);
if (CidEntry)
{
/* Get the Process */
FoundThread = CidEntry->Object;
@ -438,7 +439,7 @@ PsLookupThreadByThreadId(IN HANDLE ThreadId,
/* Make sure it's really a process */
if (FoundThread->Tcb.DispatcherHeader.Type == ThreadObject)
{
/* Reference and return it */
/* FIXME: Safe Reference and return it */
ObReferenceObject(FoundThread);
*Thread = FoundThread;
Status = STATUS_SUCCESS;
@ -447,7 +448,7 @@ PsLookupThreadByThreadId(IN HANDLE ThreadId,
/* Unlock the Entry */
ExUnlockHandleTableEntry(PspCidTable, CidEntry);
}
/* Return to caller */
KeLeaveCriticalRegion();
return Status;
@ -460,7 +461,7 @@ HANDLE
NTAPI
PsGetCurrentThreadId(VOID)
{
return(PsGetCurrentThread()->Cid.UniqueThread);
return PsGetCurrentThread()->Cid.UniqueThread;
}
/*
@ -580,7 +581,7 @@ BOOLEAN
NTAPI
PsIsThreadTerminating(IN PETHREAD Thread)
{
return (Thread->Terminated ? TRUE : FALSE);
return Thread->Terminated ? TRUE : FALSE;
}
/*
@ -588,9 +589,9 @@ PsIsThreadTerminating(IN PETHREAD Thread)
*/
BOOLEAN
NTAPI
PsIsSystemThread(PETHREAD Thread)
PsIsSystemThread(IN PETHREAD Thread)
{
return (Thread->SystemThread ? TRUE: FALSE);
return Thread->SystemThread ? TRUE: FALSE;
}
/*
@ -598,7 +599,7 @@ PsIsSystemThread(PETHREAD Thread)
*/
BOOLEAN
NTAPI
PsIsThreadImpersonating(PETHREAD Thread)
PsIsThreadImpersonating(IN PETHREAD Thread)
{
return Thread->ActiveImpersonationInfo;
}
@ -608,8 +609,8 @@ PsIsThreadImpersonating(PETHREAD Thread)
*/
VOID
NTAPI
PsSetThreadHardErrorsAreDisabled(PETHREAD Thread,
BOOLEAN HardErrorsAreDisabled)
PsSetThreadHardErrorsAreDisabled(IN PETHREAD Thread,
IN BOOLEAN HardErrorsAreDisabled)
{
Thread->HardErrorsAreDisabled = HardErrorsAreDisabled;
}
@ -619,8 +620,8 @@ PsSetThreadHardErrorsAreDisabled(PETHREAD Thread,
*/
VOID
NTAPI
PsSetThreadWin32Thread(PETHREAD Thread,
PVOID Win32Thread)
PsSetThreadWin32Thread(IN PETHREAD Thread,
IN PVOID Win32Thread)
{
Thread->Tcb.Win32Thread = Win32Thread;
}
@ -629,7 +630,7 @@ NTSTATUS
NTAPI
NtCreateThread(OUT PHANDLE ThreadHandle,
IN ACCESS_MASK DesiredAccess,
IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL,
IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL,
IN HANDLE ProcessHandle,
OUT PCLIENT_ID ClientId,
IN PCONTEXT ThreadContext,
@ -703,39 +704,41 @@ NTAPI
NtOpenThread(OUT PHANDLE ThreadHandle,
IN ACCESS_MASK DesiredAccess,
IN POBJECT_ATTRIBUTES ObjectAttributes,
IN PCLIENT_ID ClientId OPTIONAL)
IN PCLIENT_ID ClientId OPTIONAL)
{
KPROCESSOR_MODE PreviousMode;
KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
CLIENT_ID SafeClientId;
ULONG Attributes = 0;
HANDLE hThread = NULL;
NTSTATUS Status = STATUS_SUCCESS;
PETHREAD Thread;
BOOLEAN HasObjectName = FALSE;
ACCESS_STATE AccessState;
AUX_DATA AuxData;
PAGED_CODE();
PreviousMode = KeGetPreviousMode();
/* Probe the paraemeters */
if(PreviousMode != KernelMode)
/* Check if we were called from user mode */
if (PreviousMode != KernelMode)
{
/* Enter SEH for probing */
_SEH_TRY
{
/* Probe the thread handle */
ProbeForWriteHandle(ThreadHandle);
if(ClientId != NULL)
/* Check for a CID structure */
if (ClientId)
{
ProbeForRead(ClientId,
sizeof(CLIENT_ID),
sizeof(ULONG));
/* Probe and capture it */
ProbeForRead(ClientId, sizeof(CLIENT_ID), sizeof(ULONG));
SafeClientId = *ClientId;
ClientId = &SafeClientId;
}
/* just probe the object attributes structure, don't capture it
completely. This is done later if necessary */
/*
* Just probe the object attributes structure, don't capture it
* completely. This is done later if necessary
*/
ProbeForRead(ObjectAttributes,
sizeof(OBJECT_ATTRIBUTES),
sizeof(ULONG));
@ -744,22 +747,47 @@ NtOpenThread(OUT PHANDLE ThreadHandle,
}
_SEH_HANDLE
{
/* Get the exception code */
Status = _SEH_GetExceptionCode();
}
_SEH_END;
if(!NT_SUCCESS(Status)) return Status;
if (!NT_SUCCESS(Status)) return Status;
}
else
{
/* Otherwise just get the data directly */
HasObjectName = (ObjectAttributes->ObjectName != NULL);
Attributes = ObjectAttributes->Attributes;
}
if (HasObjectName && ClientId != NULL)
/* Can't pass both, fail */
if ((HasObjectName) && (ClientId)) return STATUS_INVALID_PARAMETER_MIX;
/* Create an access state */
Status = SeCreateAccessState(&AccessState,
&AuxData,
DesiredAccess,
&PsProcessType->TypeInfo.GenericMapping);
if (!NT_SUCCESS(Status)) return Status;
/* Check if this is a debugger */
if (SeSinglePrivilegeCheck(SeDebugPrivilege, PreviousMode))
{
/* can't pass both, n object name and a client id */
return STATUS_INVALID_PARAMETER_MIX;
/* Did he want full access? */
if (AccessState.RemainingDesiredAccess & MAXIMUM_ALLOWED)
{
/* Give it to him */
AccessState.PreviouslyGrantedAccess |= THREAD_ALL_ACCESS;
}
else
{
/* Otherwise just give every other access he could want */
AccessState.PreviouslyGrantedAccess |=
AccessState.RemainingDesiredAccess;
}
/* The caller desires nothing else now */
AccessState.RemainingDesiredAccess = 0;
}
/* Open by name if one was given */
@ -769,10 +797,13 @@ NtOpenThread(OUT PHANDLE ThreadHandle,
Status = ObOpenObjectByName(ObjectAttributes,
PsThreadType,
PreviousMode,
NULL,
DesiredAccess,
&AccessState,
0,
NULL,
&hThread);
/* Get rid of the access state */
SeDeleteAccessState(&AccessState);
}
else if (ClientId)
{
@ -780,35 +811,38 @@ NtOpenThread(OUT PHANDLE ThreadHandle,
if (ClientId->UniqueProcess)
{
/* Get the Process */
Status = PsLookupProcessThreadByCid(ClientId,
NULL,
&Thread);
Status = PsLookupProcessThreadByCid(ClientId, NULL, &Thread);
}
else
{
/* Get the Process */
Status = PsLookupThreadByThreadId(ClientId->UniqueThread,
&Thread);
Status = PsLookupThreadByThreadId(ClientId->UniqueThread, &Thread);
}
/* Fail if we didn't find anything */
if(!NT_SUCCESS(Status)) return Status;
/* Check if we didn't find anything */
if (!NT_SUCCESS(Status))
{
/* Get rid of the access state and return */
SeDeleteAccessState(&AccessState);
return Status;
}
/* Open the Thread Object */
Status = ObOpenObjectByPointer(Thread,
Attributes,
NULL,
DesiredAccess,
&AccessState,
0,
PsThreadType,
PreviousMode,
&hThread);
/* Dereference the thread */
/* Delete the access state and dereference the thread */
SeDeleteAccessState(&AccessState);
ObDereferenceObject(Thread);
}
else
{
/* neither an object name nor a client id was passed */
/* Neither an object name nor a client id was passed */
return STATUS_INVALID_PARAMETER_MIX;
}
@ -823,6 +857,7 @@ NtOpenThread(OUT PHANDLE ThreadHandle,
}
_SEH_HANDLE
{
/* Get the exception code */
Status = _SEH_GetExceptionCode();
}
_SEH_END;
@ -832,22 +867,15 @@ NtOpenThread(OUT PHANDLE ThreadHandle,
return Status;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
NtYieldExecution(VOID)
{
KiDispatchThread(Ready);
return(STATUS_SUCCESS);
}
/*
* @implemented
*/
KPROCESSOR_MODE
NTAPI
ExGetPreviousMode (VOID)
{
return (KPROCESSOR_MODE)PsGetCurrentThread()->Tcb.PreviousMode;
return STATUS_SUCCESS;
}
/* EOF */