linux-kernel - [kernel-hardening][PATCH] arm: mm: idmap: Mark variables as ro_after

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Message-ID: <20171208111318.GA12346@pjb1027-Latitude-E5410>
Date:   Fri, 8 Dec 2017 20:13:18 +0900
From:   Jinbum Park <jinb.park7@...il.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-hardening@...ts.openwall.com
Cc:     linux@...linux.org.uk, gregkh@...uxfoundation.org,
        tglx@...utronix.de, kstewart@...uxfoundation.org, mingo@...nel.org,
        pombredanne@...b.com
Subject: [kernel-hardening][PATCH] arm: mm: idmap: Mark variables as
 ro_after_init

idmap_pgd, arch_phys_to_idmap_offset are setup once
while init stage, and never changed after that.
so, it is good candidate for __ro_after_init.

Signed-off-by: Jinbum Park <jinb.park7@...il.com>
---
 arch/arm/mm/idmap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
index 10bfba8..1d1edd0 100644
--- a/arch/arm/mm/idmap.c
+++ b/arch/arm/mm/idmap.c
@@ -16,8 +16,8 @@
  * are not supported on any CPU using the idmap tables as its current
  * page tables.
  */
-pgd_t *idmap_pgd;
-long long arch_phys_to_idmap_offset;
+pgd_t *idmap_pgd __ro_after_init;
+long long arch_phys_to_idmap_offset __ro_after_init;
 
 #ifdef CONFIG_ARM_LPAE
 static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end,
-- 
1.9.1