From d2eec956f92caee8a5706eb572c1130e9a789893 Mon Sep 17 00:00:00 2001
From: zeffy <zeffy@users.noreply.github.com>
Date: Tue, 22 Aug 2017 19:06:11 -0700
Subject: [PATCH] ensure memory regions are writeable before patching

---
 wufuc/hooks.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/wufuc/hooks.c b/wufuc/hooks.c
index b93e881..7ab0d90 100644
--- a/wufuc/hooks.c
+++ b/wufuc/hooks.c
@@ -169,13 +169,19 @@ BOOL PatchWUA(HMODULE hModule) {
     lpbIsCPUSupportedResult = (LPBOOL)(*(uintptr_t *)(ptr + offset01));
 #endif
 
+    DWORD flNewProtect = PAGE_READWRITE;
+    DWORD flOldProtect;
     if (*lpbFirstRun) {
+        VirtualProtect(lpbFirstRun, sizeof(BOOL), flNewProtect, &flOldProtect);
         *lpbFirstRun = FALSE;
+        VirtualProtect(lpbFirstRun, sizeof(BOOL), flOldProtect, &flNewProtect);
         trace(L"Patched boolean value #1: %p = %08x", lpbFirstRun, *lpbFirstRun);
         result = TRUE;
     }
     if (!*lpbIsCPUSupportedResult) {
+        VirtualProtect(lpbIsCPUSupportedResult, sizeof(BOOL), flNewProtect, &flOldProtect);
         *lpbIsCPUSupportedResult = TRUE;
+        VirtualProtect(lpbIsCPUSupportedResult, sizeof(BOOL), flOldProtect, &flNewProtect);
         trace(L"Patched boolean value #2: %p = %08x", lpbIsCPUSupportedResult, *lpbIsCPUSupportedResult);
         result = TRUE;
     }