The patch titled
Subject: mm/mmap.c: mark protection_map as __ro_after_init
has been added to the -mm tree. Its filename is
mark-protection_map-as-__ro_after_init.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mark-protection_map-as-__ro_after_init.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mark-protection_map-as-__ro_after_init.patch
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------------------------------------------------------
From: Daniel Micay <danielmicay@xxxxxxxxx>
Subject: mm/mmap.c: 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.
Link: http://lkml.kernel.org/r/20170510174441.26163-1-danielmicay@xxxxxxxxx
Signed-off-by: Daniel Micay <danielmicay@xxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/mmap.c~mark-protection_map-as-__ro_after_init mm/mmap.c
--- a/mm/mmap.c~mark-protection_map-as-__ro_after_init
+++ a/mm/mmap.c
@@ -94,7 +94,7 @@ static void unmap_region(struct mm_struc
* 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
};
_
Patches currently in -mm which might be from danielmicay@xxxxxxxxx are
mark-protection_map-as-__ro_after_init.patch
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