From 63fef14fc98a8b4fad777fd3bef4d068802b3f14 Mon Sep 17 00:00:00 2001
From: Masami Hiramatsu
Date: Fri, 18 Aug 2017 17:24:00 +0900
Subject: kprobes/x86: Make insn buffer always ROX and use text_poke()

Make insn buffer always ROX and use text_poke() to write
the copied instructions instead of set_memory_*().
This makes instruction buffer stronger against other
kernel subsystems because there is no window time
to modify the buffer.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David S . Miller <davem@davemloft.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/150304463032.17009.14195368040691676813.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/kprobes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'kernel/kprobes.c')

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index a1606a4224e1..15fba7fe57c8 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -117,7 +117,7 @@ enum kprobe_slot_state {
 	SLOT_USED = 2,
 };
 
-static void *alloc_insn_page(void)
+void __weak *alloc_insn_page(void)
 {
 	return module_alloc(PAGE_SIZE);
 }
-- 
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