linux-kernel - [PATCH v2 2/8] arm64: mm: mark fault_info __ro_after

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Message-Id: <20170328213431.10904-3-opendmb@gmail.com>
Date:   Tue, 28 Mar 2017 14:34:25 -0700
From:   Doug Berger <opendmb@...il.com>
To:     mark.rutland@....com
Cc:     robh+dt@...nel.org, catalin.marinas@....com, will.deacon@....com,
        computersforpeace@...il.com, gregory.0xf0@...il.com,
        f.fainelli@...il.com, bcm-kernel-feedback-list@...adcom.com,
        opendmb@...il.com, wangkefeng.wang@...wei.com, james.morse@....com,
        mingo@...nel.org, sandeepa.s.prabhu@...il.com,
        shijie.huang@....com, linus.walleij@...aro.org, treding@...dia.com,
        jonathanh@...dia.com, olof@...om.net, mirza.krak@...il.com,
        suzuki.poulose@....com, bgolaszewski@...libre.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 2/8] arm64: mm: mark fault_info __ro_after_init

The fault_info table must be made writeable to allow installation
of custom memory abort handlers, but it can be made read-only
after initialization to provide some protection.

Signed-off-by: Doug Berger <opendmb@...il.com>
---
 arch/arm64/mm/fault.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index cdf1260f1005..43319ed58a47 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -493,7 +493,7 @@ static struct fault_info {
 	int	sig;
 	int	code;
 	const char *name;
-} fault_info[] = {
+} fault_info[] __ro_after_init = {
 	{ do_bad,		SIGBUS,  0,		"ttbr address size fault"	},
 	{ do_bad,		SIGBUS,  0,		"level 1 address size fault"	},
 	{ do_bad,		SIGBUS,  0,		"level 2 address size fault"	},
-- 
2.12.0