From a8e53c151fe7ac52a1c13a6ace0c9e8e0f61260c Mon Sep 17 00:00:00 2001
From: Jinbum Park <jinb.park7@gmail.com>
Date: Tue, 12 Dec 2017 01:43:57 +0100
Subject: ARM: 8737/1: mm: dump: add checking for writable and executable

Page mappings with full RWX permissions are a security risk.
x86, arm64 has an option to walk the page tables
and dump any bad pages.

(1404d6f13e47
("arm64: dump: Add checking for writable and exectuable pages"))
Add a similar implementation for arm.

Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Jinbum Park <jinb.park7@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 arch/arm/mm/init.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'arch/arm/mm/init.c')

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index a1f11a7ee81b..bd6f4513539a 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -36,6 +36,7 @@
 #include <asm/system_info.h>
 #include <asm/tlb.h>
 #include <asm/fixmap.h>
+#include <asm/ptdump.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -738,6 +739,7 @@ static int __mark_rodata_ro(void *unused)
 void mark_rodata_ro(void)
 {
 	stop_machine(__mark_rodata_ro, NULL, NULL);
+	debug_checkwx();
 }
 
 void set_kernel_text_rw(void)
-- 
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