Kernel: Add helpers to validate memory addresses

kernel/src/memory/MemoryManager.cpp

@@ -184,6 +184,21 @@ namespace MemoryManager
         return {};
     }
 
+    bool validate_readable_page(u64 address)
+    {
+        auto rc = MMU::get_flags(address);
+        if (rc.has_error()) return false;
+        return true;
+    }
+
+    bool validate_writable_page(u64 address)
+    {
+        auto rc = MMU::get_flags(address);
+        if (rc.has_error()) return false;
+        if (rc.release_value() & MMU::ReadWrite) return true;
+        return false;
+    }
+
     u64 free()
     {
         return free_mem;

kernel/src/memory/MemoryManager.h

@@ -17,6 +17,9 @@ namespace MemoryManager
     Result<void> remap(u64 address, usize count, int flags);
     Result<void> remap_unaligned(u64 address, usize count, int flags);
 
+    bool validate_readable_page(u64 address);
+    bool validate_writable_page(u64 address);
+
     u64 free();
     u64 used();
     u64 reserved();