linux-kernel - [PATCH 6/7] kprobes: Check kprobes_all_disarmed in kprobe

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Date:	Thu, 26 Feb 2015 17:13:51 +0100
From:	Petr Mladek <pmladek@...e.cz>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"David S. Miller" <davem@...emloft.net>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
	Petr Mladek <pmladek@...e.cz>
Subject: [PATCH 6/7] kprobes: Check kprobes_all_disarmed in kprobe_disarmed()

The global kprobes_all_disarmed flag says that all Kprobes are disarmed
even when they are marked as enabled. Therefore the flag should get
checked by kprobe_disarmed().

Signed-off-by: Petr Mladek <pmladek@...e.cz>
---
 kernel/kprobes.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 54bc2a6960b4..799f56a50cf9 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -391,6 +391,9 @@ static inline int kprobe_disarmed(struct kprobe *p)
 {
 	struct optimized_kprobe *op;
 
+	if (kprobes_all_disarmed)
+		return 1;
+
 	/* If kprobe is not aggr/opt probe, just return kprobe is disabled */
 	if (!kprobe_aggrprobe(p))
 		return kprobe_disabled(p);
@@ -890,9 +893,17 @@ static void __disarm_kprobe(struct kprobe *p, bool reopt)
 #define try_to_optimize_kprobe(p)		do {} while (0)
 #define __arm_kprobe(p)				arch_arm_kprobe(p)
 #define __disarm_kprobe(p, o)			arch_disarm_kprobe(p)
-#define kprobe_disarmed(p)			kprobe_disabled(p)
 #define wait_for_kprobe_optimizer()		do {} while (0)
 
+/* Return true(!0) if the kprobe is disarmed. Note: p must be on hash list */
+static inline int kprobe_disarmed(struct kprobe *p)
+{
+	if (kprobes_all_disarmed)
+		return 1;
+
+	return kprobe_disabled(p);
+}
+
 /* There should be no unused kprobes can be reused without optimization */
 static void reuse_unused_kprobe(struct kprobe *ap)
 {
-- 
1.8.5.6

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