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Date: Wed, 10 May 2017 13:44:41 -0400
From: Daniel Micay <>
To: Andrew Morton <>,
Cc: Kees Cook <>,,
	Daniel Micay <>
Subject: [PATCH] mark protection_map as __ro_after_init

The protection map is only modified by per-arch init code so it can be
protected from writes after the init code runs.

This change was extracted from PaX where it's part of KERNEXEC.

Signed-off-by: Daniel Micay <>
 mm/mmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index f82741e199c0..3bd5ecd20d4d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -94,7 +94,7 @@ static void unmap_region(struct mm_struct *mm,
  *								w: (no) no
  *								x: (yes) yes
-pgprot_t protection_map[16] = {
+pgprot_t protection_map[16] __ro_after_init = {
 	__P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
 	__S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111

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