linux-kernel - [PATCH] kprobes: bugfix: checks kprobes_all_disarmed in unoptimized

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Date:	Mon, 12 Jan 2015 20:09:23 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	<masami.hiramatsu.pt@...achi.com>
CC:	<tixy@...aro.org>, <linux@....linux.org.uk>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <lizefan@...wei.com>
Subject: [PATCH] kprobes: bugfix: checks kprobes_all_disarmed in unoptimized_kprobe().

Original code failed to disarm the probed instruction after

echo 0 > /sys/kernel/debug/kprobes/enabled

if OPTPROBE is enabled.

This patch checks kprobes_all_disarmed in unoptimized_kprobe().

Signed-off-by: Wang Nan <wangnan0@...wei.com>
---
 kernel/kprobes.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 9471710..f16936b 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -630,6 +630,9 @@ static void unoptimize_kprobe(struct kprobe *p, bool force)
 {
 	struct optimized_kprobe *op;
 
+	if (kprobes_all_disarmed)
+		return;
+
 	if (!kprobe_aggrprobe(p) || kprobe_disarmed(p))
 		return; /* This is not an optprobe nor optimized */
 
-- 
1.8.4

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