Brendan Shanks : ntdll: Allow changes to DEP flags under Wow64.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: ce5fe931e138b880aa110143d840cf13143066ba
URL:    https://gitlab.winehq.org/wine/wine/-/commit/ce5fe931e138b880aa110143d840cf13143066ba

Author: Brendan Shanks <bshanks at codeweavers.com>
Date:   Thu Jul 21 11:03:18 2022 -0700

ntdll: Allow changes to DEP flags under Wow64.

---

 dlls/ntdll/unix/process.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/dlls/ntdll/unix/process.c b/dlls/ntdll/unix/process.c
index 078ad75099d..83888717a5c 100644
--- a/dlls/ntdll/unix/process.c
+++ b/dlls/ntdll/unix/process.c
@@ -73,9 +73,7 @@
 WINE_DEFAULT_DEBUG_CHANNEL(process);
 
 
-static ULONG execute_flags = MEM_EXECUTE_OPTION_DISABLE | (sizeof(void *) > sizeof(int) ?
-                                                           MEM_EXECUTE_OPTION_DISABLE_THUNK_EMULATION |
-                                                           MEM_EXECUTE_OPTION_PERMANENT : 0);
+static ULONG execute_flags = MEM_EXECUTE_OPTION_DISABLE;
 
 static UINT process_error_mode;
 
@@ -1434,8 +1432,14 @@ NTSTATUS WINAPI NtQueryInformationProcess( HANDLE handle, PROCESSINFOCLASS class
 
     case ProcessExecuteFlags:
         len = sizeof(ULONG);
-        if (size == len) *(ULONG *)info = execute_flags;
-        else ret = STATUS_INFO_LENGTH_MISMATCH;
+        if (size != len)
+            ret = STATUS_INFO_LENGTH_MISMATCH;
+        else if (is_win64 && !NtCurrentTeb()->WowTebOffset)
+            *(ULONG *)info = MEM_EXECUTE_OPTION_DISABLE |
+                             MEM_EXECUTE_OPTION_DISABLE_THUNK_EMULATION |
+                             MEM_EXECUTE_OPTION_PERMANENT;
+        else
+            *(ULONG *)info = execute_flags;
         break;
 
     case ProcessPriorityClass:
@@ -1560,7 +1564,7 @@ NTSTATUS WINAPI NtSetInformationProcess( HANDLE handle, PROCESSINFOCLASS class,
         break;
 
     case ProcessExecuteFlags:
-        if (is_win64 || size != sizeof(ULONG)) return STATUS_INVALID_PARAMETER;
+        if ((is_win64 && !NtCurrentTeb()->WowTebOffset) || size != sizeof(ULONG)) return STATUS_INVALID_PARAMETER;
         if (execute_flags & MEM_EXECUTE_OPTION_PERMANENT) return STATUS_ACCESS_DENIED;
         else
         {