ntdll: Round the pthread stack size to a page boundary.

dlls/ntdll/loader.c

@@ -3149,7 +3149,7 @@ void WINAPI LdrInitializeThunk( void *kernel_start, ULONG_PTR unknown2,
     RemoveEntryList( &wm->ldr.InMemoryOrderModuleList );
     InsertHeadList( &peb->LdrData->InMemoryOrderModuleList, &wm->ldr.InMemoryOrderModuleList );
 
-    if ((status = virtual_alloc_thread_stack( NtCurrentTeb(), 0, 0, 0 )) != STATUS_SUCCESS)
+    if ((status = virtual_alloc_thread_stack( NtCurrentTeb(), 0, 0, NULL )) != STATUS_SUCCESS)
     {
         ERR( "Main exe initialization for %s failed, status %x\n",
              debugstr_w(peb->ProcessParameters->ImagePathName.Buffer), status );

dlls/ntdll/ntdll_misc.h

@@ -168,7 +168,7 @@ extern NTSTATUS nt_to_unix_file_name_attr( const OBJECT_ATTRIBUTES *attr, ANSI_S
 extern void virtual_get_system_info( SYSTEM_BASIC_INFORMATION *info ) DECLSPEC_HIDDEN;
 extern NTSTATUS virtual_create_builtin_view( void *base ) DECLSPEC_HIDDEN;
 extern NTSTATUS virtual_alloc_thread_stack( TEB *teb, SIZE_T reserve_size,
-                                            SIZE_T commit_size, SIZE_T extra_size ) DECLSPEC_HIDDEN;
+                                            SIZE_T commit_size, SIZE_T *pthread_size ) DECLSPEC_HIDDEN;
 extern void virtual_clear_thread_stack( void *stack_end ) DECLSPEC_HIDDEN;
 extern BOOL virtual_handle_stack_fault( void *addr ) DECLSPEC_HIDDEN;
 extern BOOL virtual_is_valid_code_address( const void *addr, SIZE_T size ) DECLSPEC_HIDDEN;

dlls/ntdll/thread.c

@@ -540,6 +540,7 @@ NTSTATUS WINAPI RtlCreateUserThread( HANDLE process, const SECURITY_DESCRIPTOR *
     DWORD tid = 0;
     int request_pipe[2];
     NTSTATUS status;
+    SIZE_T extra_stack = PTHREAD_STACK_MIN;
 
     if (process != NtCurrentProcess())
     {
@@ -618,7 +619,7 @@ NTSTATUS WINAPI RtlCreateUserThread( HANDLE process, const SECURITY_DESCRIPTOR *
     info->entry_point = start;
     info->entry_arg   = param;
 
-    if ((status = virtual_alloc_thread_stack( teb, stack_reserve, stack_commit, PTHREAD_STACK_MIN )))
+    if ((status = virtual_alloc_thread_stack( teb, stack_reserve, stack_commit, &extra_stack )))
         goto error;
 
     thread_data = (struct ntdll_thread_data *)&teb->GdiTebBatch;
@@ -630,7 +631,7 @@ NTSTATUS WINAPI RtlCreateUserThread( HANDLE process, const SECURITY_DESCRIPTOR *
 
     pthread_attr_init( &attr );
     pthread_attr_setstack( &attr, teb->DeallocationStack,
-                         (char *)teb->Tib.StackBase + PTHREAD_STACK_MIN - (char *)teb->DeallocationStack );
+                         (char *)teb->Tib.StackBase + extra_stack - (char *)teb->DeallocationStack );
     pthread_attr_setscope( &attr, PTHREAD_SCOPE_SYSTEM ); /* force creating a kernel thread */
     interlocked_xchg_add( &nb_threads, 1 );
     if (pthread_create( &pthread_id, &attr, (void * (*)(void *))start_thread, info ))

dlls/ntdll/virtual.c

@@ -1758,12 +1758,12 @@ NTSTATUS virtual_create_builtin_view( void *module )
 /***********************************************************************
  *           virtual_alloc_thread_stack
  */
-NTSTATUS virtual_alloc_thread_stack( TEB *teb, SIZE_T reserve_size, SIZE_T commit_size, SIZE_T extra_size )
+NTSTATUS virtual_alloc_thread_stack( TEB *teb, SIZE_T reserve_size, SIZE_T commit_size, SIZE_T *pthread_size )
 {
     struct file_view *view;
     NTSTATUS status;
     sigset_t sigset;
-    SIZE_T size;
+    SIZE_T size, extra_size = 0;
 
     if (!reserve_size || !commit_size)
     {
@@ -1775,6 +1775,7 @@ NTSTATUS virtual_alloc_thread_stack( TEB *teb, SIZE_T reserve_size, SIZE_T commi
     size = max( reserve_size, commit_size );
     if (size < 1024 * 1024) size = 1024 * 1024;  /* Xlib needs a large stack */
     size = (size + 0xffff) & ~0xffff;  /* round to 64K boundary */
+    if (pthread_size) *pthread_size = extra_size = max( page_size, ROUND_SIZE( 0, *pthread_size ));
 
     server_enter_uninterrupted_section( &csVirtual, &sigset );