1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index c2b66a277e98..a95cb2589765 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -205,6 +205,22 @@ extern struct trace_event_functions exit_syscall_print_funcs;
 	}								\
 	static inline long SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
 
+#ifdef TIF_FSCHECK
+/*
+ * Called before coming back to user-mode. Returning to user-mode with an
+ * address limit different than USER_DS can allow to overwrite kernel memory.
+ */
+static inline void addr_limit_user_check(void)
+{
+
+	if (!test_thread_flag(TIF_FSCHECK))
+		return;
+
+	BUG_ON(!segment_eq(get_fs(), USER_DS));
+	clear_thread_flag(TIF_FSCHECK);
+}
+#endif
+
 asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
 			       qid_t id, void __user *addr);
 asmlinkage long sys_time(time_t __user *tloc);