Don't require execute permission for thread stacks.

dlls/kernel/fiber.c

@@ -93,7 +93,7 @@ LPVOID WINAPI CreateFiberEx( SIZE_T stack_commit, SIZE_T stack_reserve, DWORD fl
 
     /* FIXME: should use the thread stack allocation routines here */
     if (!stack_reserve) stack_reserve = 1024*1024;
-    if(!(fiber->stack_allocation = VirtualAlloc( 0, stack_reserve, MEM_COMMIT, PAGE_EXECUTE_READWRITE )))
+    if(!(fiber->stack_allocation = VirtualAlloc( 0, stack_reserve, MEM_COMMIT, PAGE_READWRITE )))
     {
         HeapFree( GetProcessHeap(), 0, fiber );
         return NULL;

dlls/kernel/thread.c

@@ -66,7 +66,7 @@ TEB *THREAD_InitStack( TEB *teb, DWORD stack_size )
     stack_size = (stack_size + (page_size - 1)) & ~(page_size - 1);
     if (stack_size < 1024 * 1024) stack_size = 1024 * 1024;  /* Xlib needs a large stack */
 
-    if (!(base = VirtualAlloc( NULL, stack_size, MEM_COMMIT, PAGE_EXECUTE_READWRITE )))
+    if (!(base = VirtualAlloc( NULL, stack_size, MEM_COMMIT, PAGE_READWRITE )))
         return NULL;
 
     teb->DeallocationStack = base;
@@ -75,7 +75,7 @@ TEB *THREAD_InitStack( TEB *teb, DWORD stack_size )
 
     /* Setup guard pages */
 
-    VirtualProtect( base, 1, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_prot );
+    VirtualProtect( base, 1, PAGE_READWRITE | PAGE_GUARD, &old_prot );
     return teb;
 }
 

dlls/ntdll/thread.c

@@ -192,7 +192,7 @@ static void start_thread( struct wine_pthread_thread_info *info )
     size = info->stack_size;
     teb->DeallocationStack = info->stack_base;
     NtAllocateVirtualMemory( NtCurrentProcess(), &teb->DeallocationStack, 0,
-                             &size, MEM_SYSTEM, PAGE_EXECUTE_READWRITE );
+                             &size, MEM_SYSTEM, PAGE_READWRITE );
     /* limit is lower than base since the stack grows down */
     teb->Tib.StackBase  = (char *)info->stack_base + info->stack_size;
     teb->Tib.StackLimit = info->stack_base;
@@ -200,7 +200,7 @@ static void start_thread( struct wine_pthread_thread_info *info )
     /* setup the guard page */
     size = 1;
     NtProtectVirtualMemory( NtCurrentProcess(), &teb->DeallocationStack, &size,
-                            PAGE_EXECUTE_READWRITE | PAGE_GUARD, NULL );
+                            PAGE_READWRITE | PAGE_GUARD, NULL );
     RtlFreeHeap( GetProcessHeap(), 0, info );
 
     RtlAcquirePebLock();