linux-kernel - [kernel-hardening][PATCH] arm: hw_breakpoint: Mark variables as __ro_after

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Date:   Mon, 11 Dec 2017 21:50:43 +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:     will.deacon@....com, mark.rutland@....com, linux@...linux.org.uk,
        keescook@...omium.org
Subject: [kernel-hardening][PATCH] arm: hw_breakpoint: Mark variables as
 __ro_after_init

core_num_brps, core_num_wrps, debug_arch, has_ossr,
max_watchpoint_len 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/kernel/hw_breakpoint.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c
index af2a7f1..629e251 100644
--- a/arch/arm/kernel/hw_breakpoint.c
+++ b/arch/arm/kernel/hw_breakpoint.c
@@ -44,17 +44,17 @@
 static DEFINE_PER_CPU(struct perf_event *, wp_on_reg[ARM_MAX_WRP]);
 
 /* Number of BRP/WRP registers on this CPU. */
-static int core_num_brps;
-static int core_num_wrps;
+static int core_num_brps __ro_after_init;
+static int core_num_wrps __ro_after_init;
 
 /* Debug architecture version. */
-static u8 debug_arch;
+static u8 debug_arch __ro_after_init;
 
 /* Does debug architecture support OS Save and Restore? */
-static bool has_ossr;
+static bool has_ossr __ro_after_init;
 
 /* Maximum supported watchpoint length. */
-static u8 max_watchpoint_len;
+static u8 max_watchpoint_len __ro_after_init;
 
 #define READ_WB_REG_CASE(OP2, M, VAL)			\
 	case ((OP2 << 4) + M):				\
-- 
1.9.1