From ae6ae91d1abf87847f2d9218512f29c94a101a76 Mon Sep 17 00:00:00 2001
From: Derek Lesho <dereklesho52@gmail.com>
Date: Fri, 19 Apr 2019 18:24:54 +0200
Subject: [PATCH] ntoskrnl.exe: Implement PsLookupProcessByProcessId.

Signed-off-by: Derek Lesho <dereklesho52@Gmail.com>
Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/ntoskrnl.exe/ntoskrnl.c | 30 +++++++++++++++++++-----------
 include/ddk/ntifs.h          |  1 +
 2 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index d31082be148..7f3ca058cef 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -2482,6 +2482,25 @@ PEPROCESS WINAPI IoGetCurrentProcess(void)
     return NULL;
 }
 
+/***********************************************************************
+ *           PsLookupProcessByProcessId  (NTOSKRNL.EXE.@)
+ */
+NTSTATUS WINAPI PsLookupProcessByProcessId( HANDLE processid, PEPROCESS *process )
+{
+    NTSTATUS status;
+    HANDLE handle;
+
+    TRACE( "(%p %p)\n", processid, process );
+
+    if (!(handle = OpenProcess( PROCESS_ALL_ACCESS, FALSE, HandleToUlong(processid) )))
+        return STATUS_INVALID_PARAMETER;
+
+    status = ObReferenceObjectByHandle( handle, PROCESS_ALL_ACCESS, PsProcessType, KernelMode, (void**)process, NULL );
+
+    NtClose( handle );
+    return status;
+}
+
 
 static void *create_thread_object( HANDLE handle )
 {
@@ -3254,17 +3273,6 @@ NTSTATUS WINAPI PsSetLoadImageNotifyRoutine(PLOAD_IMAGE_NOTIFY_ROUTINE routine)
     return STATUS_SUCCESS;
 }
 
-/*****************************************************
- *           PsLookupProcessByProcessId  (NTOSKRNL.EXE.@)
- */
-NTSTATUS WINAPI PsLookupProcessByProcessId(HANDLE processid, PEPROCESS *process)
-{
-    static int once;
-    if (!once++) FIXME("(%p %p) stub\n", processid, process);
-    return STATUS_NOT_IMPLEMENTED;
-}
-
-
 /*****************************************************
  *           IoSetThreadHardErrorMode  (NTOSKRNL.EXE.@)
  */
diff --git a/include/ddk/ntifs.h b/include/ddk/ntifs.h
index 9b57ae7ad77..ec4d1d5aa7f 100644
--- a/include/ddk/ntifs.h
+++ b/include/ddk/ntifs.h
@@ -131,6 +131,7 @@ typedef struct _FS_FILTER_CALLBACKS
 
 BOOLEAN WINAPI FsRtlIsNameInExpression(PUNICODE_STRING, PUNICODE_STRING, BOOLEAN, PWCH);
 NTSTATUS WINAPI ObQueryNameString(PVOID,POBJECT_NAME_INFORMATION,ULONG,PULONG);
+NTSTATUS WINAPI PsLookupProcessByProcessId(HANDLE,PEPROCESS*);
 NTSTATUS WINAPI PsLookupThreadByThreadId(HANDLE,PETHREAD*);
 void WINAPI PsRevertToSelf(void);