From 2543348eb9a6d0ab4cdac725d240b16e0648dce7 Mon Sep 17 00:00:00 2001
From: "Olivier F. R. Dierick" <o.dierick@piezo-forte.be>
Date: Tue, 19 Apr 2016 07:25:39 +0200
Subject: [PATCH] kernel32: Implement SetProcessDEPPolicy().

---
 dlls/kernel32/process.c | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/dlls/kernel32/process.c b/dlls/kernel32/process.c
index ec37b66621f..cb15823c864 100644
--- a/dlls/kernel32/process.c
+++ b/dlls/kernel32/process.c
@@ -49,6 +49,8 @@ typedef struct
     DWORD dwReserved;
 } LOADPARMS32;
 
+static BOOL is_wow64;
+
 SYSTEM_BASIC_INFORMATION system_info = { 0 };
 
 /* Process flags */
@@ -59,6 +61,7 @@ SYSTEM_BASIC_INFORMATION system_info = { 0 };
 #define PDB32_FILE_APIS_OEM 0x0040  /* File APIs are OEM */
 #define PDB32_WIN32S_PROC   0x8000  /* Win32s process */
 
+static DEP_SYSTEM_POLICY_TYPE system_DEP_policy = OptIn;
 
 /***********************************************************************
  *           wait_input_idle
@@ -177,7 +180,6 @@ DWORD WINAPI LoadModule( LPCSTR name, LPVOID paramBlock )
     return ret;
 }
 
-
 /***********************************************************************
  *           ExitProcess   (KERNEL32.@)
  *
@@ -562,9 +564,35 @@ DEP_SYSTEM_POLICY_TYPE WINAPI GetSystemDEPPolicy(void)
  */
 BOOL WINAPI SetProcessDEPPolicy(DWORD newDEP)
 {
-    FIXME("(%d): stub\n", newDEP);
-    SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
-    return FALSE;
+    ULONG dep_flags = 0;
+    NTSTATUS status;
+
+    TRACE("(%d)\n", newDEP);
+
+    if (is_wow64 || (system_DEP_policy != OptIn && system_DEP_policy != OptOut) )
+    {
+        SetLastError(ERROR_ACCESS_DENIED);
+        return FALSE;
+    }
+
+    if (!newDEP)
+        dep_flags = MEM_EXECUTE_OPTION_ENABLE;
+    else if (newDEP & PROCESS_DEP_ENABLE)
+        dep_flags = MEM_EXECUTE_OPTION_DISABLE|MEM_EXECUTE_OPTION_PERMANENT;
+    else
+    {
+        SetLastError(ERROR_ACCESS_DENIED);
+        return FALSE;
+    }
+
+    if (newDEP & PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION)
+        dep_flags |= MEM_EXECUTE_OPTION_DISABLE_THUNK_EMULATION;
+
+    status = NtSetInformationProcess( GetCurrentProcess(), ProcessExecuteFlags,
+                                        &dep_flags, sizeof(dep_flags) );
+
+    if (status) SetLastError( RtlNtStatusToDosError(status) );
+    return !status;
 }
 
 /**********************************************************************
-- 
2.29.2