[06/23] ntdll: Map empty page if needed inside system mappings.

[Andrew Wesie]

Some anti-debug protections will try to read all of the memory
for a loaded system DLL. This patch will handle the page fault when
it attempts to read the space between sections.

Signed-off-by: Andrew Wesie <awesie at gmail.com>
---
 dlls/ntdll/virtual.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dlls/ntdll/virtual.c b/dlls/ntdll/virtual.c
index e826fa0..f70e9fc 100644
--- a/dlls/ntdll/virtual.c
+++ b/dlls/ntdll/virtual.c
@@ -1512,6 +1512,11 @@ NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err, BOOL on_signal_stack )
             /* ignore fault if page is writable now */
             if (VIRTUAL_GetUnixProt( *vprot ) & PROT_WRITE) ret = STATUS_SUCCESS;
         }
+        if (err == 0 && (view->protect & VPROT_SYSTEM))
+        {
+            wine_anon_mmap(page, page_size, PROT_READ, MAP_FIXED);
+            ret = STATUS_SUCCESS;
+        }
         if (!on_signal_stack && (*vprot & VPROT_GUARD))
         {
             VIRTUAL_SetProt( view, page, page_size, *vprot & ~VPROT_GUARD );
-- 
2.7.4