ARM: 5742/1: ARM: add debug check for invalid kernel page faults

[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / arm / mm / fault.c

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index ae0e25f..10e0680 100644 (file)
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -292,6 +292,11 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
                 * down_read()
                 */
                might_sleep();
+#ifdef CONFIG_DEBUG_VM
+               if (!user_mode(regs) &&
+                   !search_exception_tables(regs->ARM_pc))
+                       goto no_context;
+#endif
        }
 
        fault = __do_page_fault(mm, addr, fsr, tsk);