linux-kernel - [PATCH tip/master 2/3] kprobes: Use NOKPROBE

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Message-ID: <20150716071057.14218.66097.stgit@localhost.localdomain>
Date:	Thu, 16 Jul 2015 16:10:57 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Pratyush Anand <panand@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH tip/master 2/3] kprobes: Use NOKPROBE_SYMBOL() in sample
 modules

Use NOKPROBE_SYMBOL() to protect handlers from kprobes
in sample modules.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Ananth N Mavinakayanahalli <ananth@...ibm.com>
---
 samples/kprobes/jprobe_example.c    |    1 +
 samples/kprobes/kprobe_example.c    |    3 +++
 samples/kprobes/kretprobe_example.c |    2 ++
 3 files changed, 6 insertions(+)

diff --git a/samples/kprobes/jprobe_example.c b/samples/kprobes/jprobe_example.c
index 9119ac6..158d82c 100644
--- a/samples/kprobes/jprobe_example.c
+++ b/samples/kprobes/jprobe_example.c
@@ -34,6 +34,7 @@ static long jdo_fork(unsigned long clone_flags, unsigned long stack_start,
 	jprobe_return();
 	return 0;
 }
+NOKPROBE_SYMBOL(jdo_fork);
 
 static struct jprobe my_jprobe = {
 	.entry			= jdo_fork,
diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
index 366db1a..462d90f 100644
--- a/samples/kprobes/kprobe_example.c
+++ b/samples/kprobes/kprobe_example.c
@@ -46,6 +46,7 @@ static int handler_pre(struct kprobe *p, struct pt_regs *regs)
 	/* A dump_stack() here will give a stack backtrace */
 	return 0;
 }
+NOKPROBE_SYMBOL(handler_pre);
 
 /* kprobe post_handler: called after the probed instruction is executed */
 static void handler_post(struct kprobe *p, struct pt_regs *regs,
@@ -68,6 +69,7 @@ static void handler_post(struct kprobe *p, struct pt_regs *regs,
 		p->addr, regs->ex1);
 #endif
 }
+NOKPROBE_SYMBOL(handler_post);
 
 /*
  * fault_handler: this is called if an exception is generated for any
@@ -81,6 +83,7 @@ static int handler_fault(struct kprobe *p, struct pt_regs *regs, int trapnr)
 	/* Return 0 because we don't handle the fault. */
 	return 0;
 }
+NOKPROBE_SYMBOL(handler_fault);
 
 static int __init kprobe_init(void)
 {
diff --git a/samples/kprobes/kretprobe_example.c b/samples/kprobes/kretprobe_example.c
index 1041b67..d932c52 100644
--- a/samples/kprobes/kretprobe_example.c
+++ b/samples/kprobes/kretprobe_example.c
@@ -47,6 +47,7 @@ static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
 	data->entry_stamp = ktime_get();
 	return 0;
 }
+NOKPROBE_SYMBOL(entry_handler);
 
 /*
  * Return-probe handler: Log the return value and duration. Duration may turn
@@ -66,6 +67,7 @@ static int ret_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
 			func_name, retval, (long long)delta);
 	return 0;
 }
+NOKPROBE_SYMBOL(ret_handler);
 
 static struct kretprobe my_kretprobe = {
 	.handler		= ret_handler,

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